Add an HE-AAC v1 decoder.

A large portion of this code was orignally authored by Robert Swain. The rest
was written by me. Full history is available at:
svn://svn.ffmpeg.org/soc/aac-sbr
http://github.com/aconverse/ffmpeg-heaac/tree/sbr_pub

Originally committed as revision 22316 to svn://svn.ffmpeg.org/ffmpeg/trunk

9 files changed, 2668 insertions, 35 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 5eeb1437ad..3931aabe50 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -41,7 +41,7 @@ OBJS-$(CONFIG_VAAPI)                   += vaapi.o
 OBJS-$(CONFIG_VDPAU)                   += vdpau.o
 
 # decoders/encoders/hardware accelerators
-OBJS-$(CONFIG_AAC_DECODER)             += aac.o aactab.o
+OBJS-$(CONFIG_AAC_DECODER)             += aac.o aactab.o aacsbr.o
 OBJS-$(CONFIG_AAC_ENCODER)             += aacenc.o aaccoder.o    \
                                           aacpsy.o aactab.o      \
                                           psymodel.o iirfilter.o \
diff --git a/libavcodec/aac.c b/libavcodec/aac.c
index c4755420b4..dbaffeedc6 100644
--- a/libavcodec/aac.c
+++ b/libavcodec/aac.c
@@ -62,7 +62,7 @@
  * N                    MIDI
  * N                    Harmonic and Individual Lines plus Noise
  * N                    Text-To-Speech Interface
- * N (in progress)      Spectral Band Replication
+ * Y                    Spectral Band Replication
  * Y (not in this code) Layer-1
  * Y (not in this code) Layer-2
  * Y (not in this code) Layer-3
@@ -86,6 +86,8 @@
 #include "aac.h"
 #include "aactab.h"
 #include "aacdectab.h"
+#include "sbr.h"
+#include "aacsbr.h"
 #include "mpeg4audio.h"
 #include "aac_parser.h"
 
@@ -180,14 +182,18 @@ static av_cold int che_configure(AACContext *ac,
     if (che_pos[type][id]) {
         if (!ac->che[type][id] && !(ac->che[type][id] = av_mallocz(sizeof(ChannelElement))))
             return AVERROR(ENOMEM);
+        ff_aac_sbr_ctx_init(&ac->che[type][id]->sbr);
         if (type != TYPE_CCE) {
             ac->output_data[(*channels)++] = ac->che[type][id]->ch[0].ret;
             if (type == TYPE_CPE) {
                 ac->output_data[(*channels)++] = ac->che[type][id]->ch[1].ret;
             }
         }
-    } else
+    } else {
+        if (ac->che[type][id])
+            ff_aac_sbr_ctx_close(&ac->che[type][id]->sbr);
         av_freep(&ac->che[type][id]);
+    }
     return 0;
 }
 
@@ -530,6 +536,8 @@ static av_cold int aac_decode_init(AVCodecContext *avccontext)
     AAC_INIT_VLC_STATIC( 9, 366);
     AAC_INIT_VLC_STATIC(10, 462);
 
+    ff_aac_sbr_init();
+
     dsputil_init(&ac->dsp, avccontext);
 
     ac->random_state = 0x1f2e3d4c;
@@ -1545,23 +1553,6 @@ static int decode_cce(AACContext *ac, GetBitContext *gb, ChannelElement *che)
 }
 
 /**
- * Decode Spectral Band Replication extension data; reference: table 4.55.
- *
- * @param   crc flag indicating the presence of CRC checksum
- * @param   cnt length of TYPE_FIL syntactic element in bytes
- *
- * @return  Returns number of bytes consumed from the TYPE_FIL element.
- */
-static int decode_sbr_extension(AACContext *ac, GetBitContext *gb,
-                                int crc, int cnt)
-{
-    // TODO : sbr_extension implementation
-    av_log_missing_feature(ac->avccontext, "SBR", 0);
-    skip_bits_long(gb, 8 * cnt - 4); // -4 due to reading extension type
-    return cnt;
-}
-
-/**
  * Parse whether channels are to be excluded from Dynamic Range Compression; reference: table 4.53.
  *
  * @return  Returns number of bytes consumed.
@@ -1641,7 +1632,8 @@ static int decode_dynamic_range(DynamicRangeControl *che_drc,
  *
  * @return Returns number of bytes consumed
  */
-static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt)
+static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt,
+                                    ChannelElement *che, enum RawDataBlockType elem_type)
 {
     int crc_flag = 0;
     int res = cnt;
@@ -1649,7 +1641,21 @@ static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt)
     case EXT_SBR_DATA_CRC:
         crc_flag++;
     case EXT_SBR_DATA:
-        res = decode_sbr_extension(ac, gb, crc_flag, cnt);
+        if (!che) {
+            av_log(ac->avccontext, AV_LOG_ERROR, "SBR was found before the first channel element.\n");
+            return res;
+        } else if (!ac->m4ac.sbr) {
+            av_log(ac->avccontext, AV_LOG_ERROR, "SBR signaled to be not-present but was found in the bitstream.\n");
+            skip_bits_long(gb, 8 * cnt - 4);
+            return res;
+        } else if (ac->m4ac.sbr == -1 && ac->output_configured == OC_LOCKED) {
+            av_log(ac->avccontext, AV_LOG_ERROR, "Implicit SBR was found with a first occurrence after the first frame.\n");
+            skip_bits_long(gb, 8 * cnt - 4);
+            return res;
+        } else {
+            ac->m4ac.sbr = 1;
+        }
+        res = ff_decode_sbr_extension(ac, &che->sbr, gb, crc_flag, cnt, elem_type);
         break;
     case EXT_DYNAMIC_RANGE:
         res = decode_dynamic_range(&ac->che_drc, gb, cnt);
@@ -1830,8 +1836,9 @@ static void apply_independent_coupling(AACContext *ac,
     const float bias = ac->add_bias;
     const float *src = cce->ch[0].ret;
     float *dest = target->ret;
+    const int len = 1024 << (ac->m4ac.sbr == 1);
 
-    for (i = 0; i < 1024; i++)
+    for (i = 0; i < len; i++)
         dest[i] += gain * (src[i] - bias);
 }
 
@@ -1889,10 +1896,18 @@ static void spectral_to_sample(AACContext *ac)
                     apply_tns(che->ch[1].coeffs, &che->ch[1].tns, &che->ch[1].ics, 1);
                 if (type <= TYPE_CPE)
                     apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, apply_dependent_coupling);
-                if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT)
+                if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) {
                     imdct_and_windowing(ac, &che->ch[0]);
-                if (type == TYPE_CPE)
+                    if (ac->m4ac.sbr > 0) {
+                        ff_sbr_dequant(ac, &che->sbr, type == TYPE_CPE ? TYPE_CPE : TYPE_SCE);
+                        ff_sbr_apply(ac, &che->sbr, 0, che->ch[0].ret, che->ch[0].ret);
+                    }
+                }
+                if (type == TYPE_CPE) {
                     imdct_and_windowing(ac, &che->ch[1]);
+                    if (ac->m4ac.sbr > 0)
+                        ff_sbr_apply(ac, &che->sbr, 1, che->ch[1].ret, che->ch[1].ret);
+                }
                 if (type <= TYPE_CCE)
                     apply_channel_coupling(ac, che, type, i, AFTER_IMDCT, apply_independent_coupling);
             }
@@ -1942,9 +1957,9 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     AACContext *ac = avccontext->priv_data;
-    ChannelElement *che = NULL;
+    ChannelElement *che = NULL, *che_prev = NULL;
     GetBitContext gb;
-    enum RawDataBlockType elem_type;
+    enum RawDataBlockType elem_type, elem_type_prev = TYPE_END;
     int err, elem_id, data_size_tmp;
     int buf_consumed;
     int samples = 1024, multiplier;
@@ -2014,7 +2029,7 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
                     return -1;
             }
             while (elem_id > 0)
-                elem_id -= decode_extension_payload(ac, &gb, elem_id);
+                elem_id -= decode_extension_payload(ac, &gb, elem_id, che_prev, elem_type_prev);
             err = 0; /* FIXME */
             break;
 
@@ -2023,6 +2038,9 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
             break;
         }
 
+        che_prev       = che;
+        elem_type_prev = elem_type;
+
         if (err)
             return err;
 
@@ -2034,14 +2052,14 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
 
     spectral_to_sample(ac);
 
-    multiplier = 0;
+    multiplier = (ac->m4ac.sbr == 1) ? ac->m4ac.ext_sample_rate > ac->m4ac.sample_rate : 0;
     samples <<= multiplier;
     if (ac->output_configured < OC_LOCKED) {
         avccontext->sample_rate = ac->m4ac.sample_rate << multiplier;
         avccontext->frame_size = samples;
     }
 
-    data_size_tmp = 1024 * avccontext->channels * sizeof(int16_t);
+    data_size_tmp = samples * avccontext->channels * sizeof(int16_t);
     if (*data_size < data_size_tmp) {
         av_log(avccontext, AV_LOG_ERROR,
                "Output buffer too small (%d) or trying to output too many samples (%d) for this frame.\n",
@@ -2050,7 +2068,7 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
     }
     *data_size = data_size_tmp;
 
-    ac->dsp.float_to_int16_interleave(data, (const float **)ac->output_data, 1024, avccontext->channels);
+    ac->dsp.float_to_int16_interleave(data, (const float **)ac->output_data, samples, avccontext->channels);
 
     if (ac->output_configured)
         ac->output_configured = OC_LOCKED;
@@ -2065,8 +2083,11 @@ static av_cold int aac_decode_close(AVCodecContext *avccontext)
     int i, type;
 
     for (i = 0; i < MAX_ELEM_ID; i++) {
-        for (type = 0; type < 4; type++)
+        for (type = 0; type < 4; type++) {
+            if (ac->che[type][i])
+                ff_aac_sbr_ctx_close(&ac->che[type][i]->sbr);
             av_freep(&ac->che[type][i]);
+        }
     }
 
     ff_mdct_end(&ac->mdct);
diff --git a/libavcodec/aac.h b/libavcodec/aac.h
index ec43e5fe99..4779cbfc57 100644
--- a/libavcodec/aac.h
+++ b/libavcodec/aac.h
@@ -34,6 +34,7 @@
 #include "dsputil.h"
 #include "fft.h"
 #include "mpeg4audio.h"
+#include "sbr.h"
 
 #include <stdint.h>
 
@@ -217,7 +218,7 @@ typedef struct {
     uint8_t zeroes[128];                      ///< band is not coded (used by encoder)
     DECLARE_ALIGNED(16, float, coeffs)[1024]; ///< coefficients for IMDCT
     DECLARE_ALIGNED(16, float, saved)[1024];  ///< overlap
-    DECLARE_ALIGNED(16, float, ret)[1024];    ///< PCM output
+    DECLARE_ALIGNED(16, float, ret)[2048];    ///< PCM output
     PredictorState predictor_state[MAX_PREDICTORS];
 } SingleChannelElement;
 
@@ -233,6 +234,7 @@ typedef struct {
     SingleChannelElement ch[2];
     // CCE specific
     ChannelCoupling coup;
+    SpectralBandReplication sbr;
 } ChannelElement;
 
 /**
diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c
new file mode 100644
index 0000000000..e317a5c72f
--- /dev/null
+++ b/libavcodec/aacsbr.c
@@ -0,0 +1,1759 @@
+/*
+ * AAC Spectral Band Replication decoding functions
+ * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
+ * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/aacsbr.c
+ * AAC Spectral Band Replication decoding functions
+ * @author Robert Swain ( rob opendot cl )
+ */
+
+#include "aac.h"
+#include "sbr.h"
+#include "aacsbr.h"
+#include "aacsbrdata.h"
+
+#include <stdint.h>
+#include <float.h>
+
+#define ENVELOPE_ADJUSTMENT_OFFSET 2
+#define NOISE_FLOOR_OFFSET 6.0f
+
+/**
+ * SBR VLC tables
+ */
+enum {
+    T_HUFFMAN_ENV_1_5DB,
+    F_HUFFMAN_ENV_1_5DB,
+    T_HUFFMAN_ENV_BAL_1_5DB,
+    F_HUFFMAN_ENV_BAL_1_5DB,
+    T_HUFFMAN_ENV_3_0DB,
+    F_HUFFMAN_ENV_3_0DB,
+    T_HUFFMAN_ENV_BAL_3_0DB,
+    F_HUFFMAN_ENV_BAL_3_0DB,
+    T_HUFFMAN_NOISE_3_0DB,
+    T_HUFFMAN_NOISE_BAL_3_0DB,
+};
+
+/**
+ * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
+ */
+enum {
+    FIXFIX,
+    FIXVAR,
+    VARFIX,
+    VARVAR,
+};
+
+enum {
+    EXTENSION_ID_PS = 2,
+};
+
+static VLC vlc_sbr[10];
+static const int8_t vlc_sbr_lav[10] =
+    { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
+static DECLARE_ALIGNED(16, float, analysis_cos_pre)[64];
+static DECLARE_ALIGNED(16, float, analysis_sin_pre)[64];
+static DECLARE_ALIGNED(16, float, analysis_cossin_post)[32][2];
+static const DECLARE_ALIGNED(16, float, zero64)[64];
+
+#define SBR_INIT_VLC_STATIC(num, size) \
+    INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size,     \
+                    sbr_tmp[num].sbr_bits ,                      1,                      1, \
+                    sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
+                    size)
+
+#define SBR_VLC_ROW(name) \
+    { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
+
+av_cold void ff_aac_sbr_init(void)
+{
+    int n, k;
+    static const struct {
+        const void *sbr_codes, *sbr_bits;
+        const unsigned int table_size, elem_size;
+    } sbr_tmp[] = {
+        SBR_VLC_ROW(t_huffman_env_1_5dB),
+        SBR_VLC_ROW(f_huffman_env_1_5dB),
+        SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
+        SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
+        SBR_VLC_ROW(t_huffman_env_3_0dB),
+        SBR_VLC_ROW(f_huffman_env_3_0dB),
+        SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
+        SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
+        SBR_VLC_ROW(t_huffman_noise_3_0dB),
+        SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
+    };
+
+    // SBR VLC table initialization
+    SBR_INIT_VLC_STATIC(0, 1098);
+    SBR_INIT_VLC_STATIC(1, 1092);
+    SBR_INIT_VLC_STATIC(2, 768);
+    SBR_INIT_VLC_STATIC(3, 1026);
+    SBR_INIT_VLC_STATIC(4, 1058);
+    SBR_INIT_VLC_STATIC(5, 1052);
+    SBR_INIT_VLC_STATIC(6, 544);
+    SBR_INIT_VLC_STATIC(7, 544);
+    SBR_INIT_VLC_STATIC(8, 592);
+    SBR_INIT_VLC_STATIC(9, 512);
+
+    for (n = 0; n < 64; n++) {
+        float pre = M_PI * n / 64;
+        analysis_cos_pre[n] = cosf(pre);
+        analysis_sin_pre[n] = sinf(pre);
+    }
+    for (k = 0; k < 32; k++) {
+        float post = M_PI * (k + 0.5) / 128;
+        analysis_cossin_post[k][0] =  4.0 * cosf(post);
+        analysis_cossin_post[k][1] = -4.0 * sinf(post);
+    }
+    for (n = 1; n < 320; n++)
+        sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
+    sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
+    sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
+
+    for (n = 0; n < 320; n++)
+        sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
+}
+
+av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr)
+{
+    sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
+    sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
+    sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
+    ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64);
+    ff_rdft_init(&sbr->rdft, 6, IDFT_R2C);
+}
+
+av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
+{
+    ff_mdct_end(&sbr->mdct);
+    ff_rdft_end(&sbr->rdft);
+}
+
+static int qsort_comparison_function_int16(const void *a, const void *b)
+{
+    return *(const int16_t *)a - *(const int16_t *)b;
+}
+
+static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
+{
+    int i;
+    for (i = 0; i <= last_el; i++)
+        if (table[i] == needle)
+            return 1;
+    return 0;
+}
+
+/// Limiter Frequency Band Table (14496-3 sp04 p198)
+static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
+{
+    int k;
+    if (sbr->bs_limiter_bands > 0) {
+        static const float bands_warped[3] = { 1.32715174233856803909f,   //2^(0.49/1.2)
+                                               1.18509277094158210129f,   //2^(0.49/2)
+                                               1.11987160404675912501f }; //2^(0.49/3)
+        const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
+        int16_t patch_borders[5];
+        uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
+
+        patch_borders[0] = sbr->kx[1];
+        for (k = 1; k <= sbr->num_patches; k++)
+            patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
+
+        memcpy(sbr->f_tablelim, sbr->f_tablelow,
+               (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
+        if (sbr->num_patches > 1)
+            memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
+                   (sbr->num_patches - 1) * sizeof(patch_borders[0]));
+
+        qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
+              sizeof(sbr->f_tablelim[0]),
+              qsort_comparison_function_int16);
+
+        sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
+        while (out < sbr->f_tablelim + sbr->n_lim) {
+            if (*in >= *out * lim_bands_per_octave_warped) {
+                *++out = *in++;
+            } else if (*in == *out ||
+                !in_table_int16(patch_borders, sbr->num_patches, *in)) {
+                in++;
+                sbr->n_lim--;
+            } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
+                *out = *in++;
+                sbr->n_lim--;
+            } else {
+                *++out = *in++;
+            }
+        }
+    } else {
+        sbr->f_tablelim[0] = sbr->f_tablelow[0];
+        sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
+        sbr->n_lim = 1;
+    }
+}
+
+static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
+{
+    unsigned int cnt = get_bits_count(gb);
+    uint8_t bs_header_extra_1;
+    uint8_t bs_header_extra_2;
+    int old_bs_limiter_bands = sbr->bs_limiter_bands;
+    SpectrumParameters old_spectrum_params;
+
+    sbr->start = 1;
+
+    // Save last spectrum parameters variables to compare to new ones
+    memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
+
+    sbr->bs_amp_res_header              = get_bits1(gb);
+    sbr->spectrum_params.bs_start_freq  = get_bits(gb, 4);
+    sbr->spectrum_params.bs_stop_freq   = get_bits(gb, 4);
+    sbr->spectrum_params.bs_xover_band  = get_bits(gb, 3);
+                                          skip_bits(gb, 2); // bs_reserved
+
+    bs_header_extra_1 = get_bits1(gb);
+    bs_header_extra_2 = get_bits1(gb);
+
+    if (bs_header_extra_1) {
+        sbr->spectrum_params.bs_freq_scale  = get_bits(gb, 2);
+        sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
+        sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
+    } else {
+        sbr->spectrum_params.bs_freq_scale  = 2;
+        sbr->spectrum_params.bs_alter_scale = 1;
+        sbr->spectrum_params.bs_noise_bands = 2;
+    }
+
+    // Check if spectrum parameters changed
+    if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
+        sbr->reset = 1;
+
+    if (bs_header_extra_2) {
+        sbr->bs_limiter_bands  = get_bits(gb, 2);
+        sbr->bs_limiter_gains  = get_bits(gb, 2);
+        sbr->bs_interpol_freq  = get_bits1(gb);
+        sbr->bs_smoothing_mode = get_bits1(gb);
+    } else {
+        sbr->bs_limiter_bands  = 2;
+        sbr->bs_limiter_gains  = 2;
+        sbr->bs_interpol_freq  = 1;
+        sbr->bs_smoothing_mode = 1;
+    }
+
+    if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
+        sbr_make_f_tablelim(sbr);
+
+    return get_bits_count(gb) - cnt;
+}
+
+static int array_min_int16(const int16_t *array, int nel)
+{
+    int i, min = array[0];
+    for (i = 1; i < nel; i++)
+        min = FFMIN(array[i], min);
+    return min;
+}
+
+static void make_bands(int16_t* bands, int start, int stop, int num_bands)
+{
+    int k, previous, present;
+    float base, prod;
+
+    base = powf((float)stop / start, 1.0f / num_bands);
+    prod = start;
+    previous = start;
+
+    for (k = 0; k < num_bands-1; k++) {
+        prod *= base;
+        present  = lrintf(prod);
+        bands[k] = present - previous;
+        previous = present;
+    }
+    bands[num_bands-1] = stop - previous;
+}
+
+static int check_n_master(AVCodecContext *avccontext, int n_master, int bs_xover_band)
+{
+    // Requirements (14496-3 sp04 p205)
+    if (n_master <= 0) {
+        av_log(avccontext, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
+        return -1;
+    }
+    if (bs_xover_band >= n_master) {
+        av_log(avccontext, AV_LOG_ERROR,
+               "Invalid bitstream, crossover band index beyond array bounds: %d\n",
+               bs_xover_band);
+        return -1;
+    }
+    return 0;
+}
+
+/// Master Frequency Band Table (14496-3 sp04 p194)
+static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
+                             SpectrumParameters *spectrum)
+{
+    unsigned int temp, max_qmf_subbands;
+    unsigned int start_min, stop_min;
+    int k;
+    const int8_t *sbr_offset_ptr;
+    int16_t stop_dk[13];
+
+    if (sbr->sample_rate < 32000) {
+        temp = 3000;
+    } else if (sbr->sample_rate < 64000) {
+        temp = 4000;
+    } else
+        temp = 5000;
+
+    start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
+    stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
+
+    switch (sbr->sample_rate) {
+    case 16000:
+        sbr_offset_ptr = sbr_offset[0];
+        break;
+    case 22050:
+        sbr_offset_ptr = sbr_offset[1];
+        break;
+    case 24000:
+        sbr_offset_ptr = sbr_offset[2];
+        break;
+    case 32000:
+        sbr_offset_ptr = sbr_offset[3];
+        break;
+    case 44100: case 48000: case 64000:
+        sbr_offset_ptr = sbr_offset[4];
+        break;
+    case 88200: case 96000: case 128000: case 176400: case 192000:
+        sbr_offset_ptr = sbr_offset[5];
+        break;
+    default:
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
+        return -1;
+    }
+
+    sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
+
+    if (spectrum->bs_stop_freq < 14) {
+        sbr->k[2] = stop_min;
+        make_bands(stop_dk, stop_min, 64, 13);
+        qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
+        for (k = 0; k < spectrum->bs_stop_freq; k++)
+            sbr->k[2] += stop_dk[k];
+    } else if (spectrum->bs_stop_freq == 14) {
+        sbr->k[2] = 2*sbr->k[0];
+    } else if (spectrum->bs_stop_freq == 15) {
+        sbr->k[2] = 3*sbr->k[0];
+    } else {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
+        return -1;
+    }
+    sbr->k[2] = FFMIN(64, sbr->k[2]);
+
+    // Requirements (14496-3 sp04 p205)
+    if (sbr->sample_rate <= 32000) {
+        max_qmf_subbands = 48;
+    } else if (sbr->sample_rate == 44100) {
+        max_qmf_subbands = 35;
+    } else if (sbr->sample_rate >= 48000)
+        max_qmf_subbands = 32;
+
+    if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
+        return -1;
+    }
+
+    if (!spectrum->bs_freq_scale) {
+        unsigned int dk;
+        int k2diff;
+
+        dk = spectrum->bs_alter_scale + 1;
+        sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
+        if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
+            return -1;
+
+        for (k = 1; k <= sbr->n_master; k++)
+            sbr->f_master[k] = dk;
+
+        k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
+        if (k2diff < 0) {
+            sbr->f_master[1]--;
+            sbr->f_master[2]-= (k2diff < 1);
+        } else if (k2diff) {
+            sbr->f_master[sbr->n_master]++;
+        }
+
+        sbr->f_master[0] = sbr->k[0];
+        for (k = 1; k <= sbr->n_master; k++)
+            sbr->f_master[k] += sbr->f_master[k - 1];
+
+    } else {
+        int half_bands = 7 - spectrum->bs_freq_scale;      // bs_freq_scale  = {1,2,3}
+        int two_regions, num_bands_0;
+        int vdk0_max, vdk1_min;
+        int16_t vk0[49];
+
+        if (49 * sbr->k[2] > 110 * sbr->k[0]) {
+            two_regions = 1;
+            sbr->k[1] = 2 * sbr->k[0];
+        } else {
+            two_regions = 0;
+            sbr->k[1] = sbr->k[2];
+        }
+
+        num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
+
+        if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
+            av_log(ac->avccontext, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
+            return -1;
+        }
+
+        vk0[0] = 0;
+
+        make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
+
+        qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
+        vdk0_max = vk0[num_bands_0];
+
+        vk0[0] = sbr->k[0];
+        for (k = 1; k <= num_bands_0; k++) {
+            if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
+                av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
+                return -1;
+            }
+            vk0[k] += vk0[k-1];
+        }
+
+        if (two_regions) {
+            int16_t vk1[49];
+            float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
+                                                     : 1.0f; // bs_alter_scale = {0,1}
+            int num_bands_1 = lrintf(half_bands * invwarp *
+                                     log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
+
+            make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
+
+            vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
+
+            if (vdk1_min < vdk0_max) {
+                int change;
+                qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
+                change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
+                vk1[1]           += change;
+                vk1[num_bands_1] -= change;
+            }
+
+            qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
+
+            vk1[0] = sbr->k[1];
+            for (k = 1; k <= num_bands_1; k++) {
+                if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
+                    av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
+                    return -1;
+                }
+                vk1[k] += vk1[k-1];
+            }
+
+            sbr->n_master = num_bands_0 + num_bands_1;
+            if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
+                return -1;
+            memcpy(&sbr->f_master[0],               vk0,
+                   (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
+            memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
+                    num_bands_1      * sizeof(sbr->f_master[0]));
+
+        } else {
+            sbr->n_master = num_bands_0;
+            if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
+                return -1;
+            memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
+        }
+    }
+
+    return 0;
+}
+
+/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
+static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
+{
+    int i, k, sb = 0;
+    int msb = sbr->k[0];
+    int usb = sbr->kx[1];
+    int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
+
+    sbr->num_patches = 0;
+
+    if (goal_sb < sbr->kx[1] + sbr->m[1]) {
+        for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
+    } else
+        k = sbr->n_master;
+
+    do {
+        int odd = 0;
+        for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
+            sb = sbr->f_master[i];
+            odd = (sb + sbr->k[0]) & 1;
+        }
+
+        sbr->patch_num_subbands[sbr->num_patches]  = FFMAX(sb - usb, 0);
+        sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
+
+        if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
+            usb = sb;
+            msb = sb;
+            sbr->num_patches++;
+        } else
+            msb = sbr->kx[1];
+
+        if (sbr->f_master[k] - sb < 3)
+            k = sbr->n_master;
+    } while (sb != sbr->kx[1] + sbr->m[1]);
+
+    if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
+        sbr->num_patches--;
+
+    // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5
+    // However the Coding Technologies decoder check uses 6 patches
+    if (sbr->num_patches > 6) {
+        av_log(ac->avccontext, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
+        return -1;
+    }
+
+    return 0;
+}
+
+/// Derived Frequency Band Tables (14496-3 sp04 p197)
+static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
+{
+    int k, temp;
+
+    sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
+    sbr->n[0] = (sbr->n[1] + 1) >> 1;
+
+    memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
+           (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
+    sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
+    sbr->kx[1] = sbr->f_tablehigh[0];
+
+    // Requirements (14496-3 sp04 p205)
+    if (sbr->kx[1] + sbr->m[1] > 64) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
+        return -1;
+    }
+    if (sbr->kx[1] > 32) {
+        av_log(ac->avccontext, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
+        return -1;
+    }
+
+    sbr->f_tablelow[0] = sbr->f_tablehigh[0];
+    temp = sbr->n[1] & 1;
+    for (k = 1; k <= sbr->n[0]; k++)
+        sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
+
+    sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
+                               log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
+    if (sbr->n_q > 5) {
+        av_log(ac->avccontext, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
+        return -1;
+    }
+
+    sbr->f_tablenoise[0] = sbr->f_tablelow[0];
+    temp = 0;
+    for (k = 1; k <= sbr->n_q; k++) {
+        temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
+        sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
+    }
+
+    if (sbr_hf_calc_npatches(ac, sbr) < 0)
+        return -1;
+
+    sbr_make_f_tablelim(sbr);
+
+    sbr->data[0].f_indexnoise = 0;
+    sbr->data[1].f_indexnoise = 0;
+
+    return 0;
+}
+
+static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
+                                              int elements)
+{
+    int i;
+    for (i = 0; i < elements; i++) {
+        vec[i] = get_bits1(gb);
+    }
+}
+
+/** ceil(log2(index+1)) */
+static const int8_t ceil_log2[] = {
+    0, 1, 2, 2, 3, 3,
+};
+
+static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
+                         GetBitContext *gb, SBRData *ch_data)
+{
+    int i;
+
+    ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env[1]];
+    ch_data->bs_num_env[0] = ch_data->bs_num_env[1];
+    ch_data->bs_amp_res = sbr->bs_amp_res_header;
+
+    switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
+    case FIXFIX:
+        ch_data->bs_num_env[1] = 1 << get_bits(gb, 2);
+        if (ch_data->bs_num_env[1] == 1)
+            ch_data->bs_amp_res = 0;
+
+        ch_data->bs_freq_res[1] = get_bits1(gb);
+        for (i = 1; i < ch_data->bs_num_env[1]; i++)
+            ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
+        break;
+    case FIXVAR:
+        ch_data->bs_var_bord[1] = get_bits(gb, 2);
+        ch_data->bs_num_rel[1]  = get_bits(gb, 2);
+        ch_data->bs_num_env[1]  = ch_data->bs_num_rel[1] + 1;
+
+        for (i = 0; i < ch_data->bs_num_rel[1]; i++)
+            ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
+
+        ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
+
+        for (i = 0; i < ch_data->bs_num_env[1]; i++)
+            ch_data->bs_freq_res[ch_data->bs_num_env[1] - i] = get_bits1(gb);
+        break;
+    case VARFIX:
+        ch_data->bs_var_bord[0] = get_bits(gb, 2);
+        ch_data->bs_num_rel[0]  = get_bits(gb, 2);
+        ch_data->bs_num_env[1]  = ch_data->bs_num_rel[0] + 1;
+
+        for (i = 0; i < ch_data->bs_num_rel[0]; i++)
+            ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
+
+        ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
+
+        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
+        break;
+    case VARVAR:
+        ch_data->bs_var_bord[0] = get_bits(gb, 2);
+        ch_data->bs_var_bord[1] = get_bits(gb, 2);
+        ch_data->bs_num_rel[0]  = get_bits(gb, 2);
+        ch_data->bs_num_rel[1]  = get_bits(gb, 2);
+        ch_data->bs_num_env[1]  = ch_data->bs_num_rel[0] + ch_data->bs_num_rel[1] + 1;
+
+        for (i = 0; i < ch_data->bs_num_rel[0]; i++)
+            ch_data->bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
+        for (i = 0; i < ch_data->bs_num_rel[1]; i++)
+            ch_data->bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
+
+        ch_data->bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
+
+        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
+        break;
+    }
+
+    if (ch_data->bs_frame_class == FIXFIX && ch_data->bs_num_env[1] > 4) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
+               ch_data->bs_num_env[1]);
+        return -1;
+    }
+    if (ch_data->bs_frame_class == VARVAR && ch_data->bs_num_env[1] > 5) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
+               ch_data->bs_num_env[1]);
+        return -1;
+    }
+
+    ch_data->bs_num_noise = (ch_data->bs_num_env[1] > 1) + 1;
+
+    return 0;
+}
+
+static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
+    //These variables are saved from the previous frame rather than copied
+    dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env[1]];
+    dst->bs_num_env[0]  = dst->bs_num_env[1];
+
+    //These variables are read from the bitstream and therefore copied
+    memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
+    memcpy(dst->bs_num_env+1,  src->bs_num_env+1,  sizeof(dst->bs_num_env)- sizeof(*dst->bs_num_env));
+    memcpy(dst->bs_var_bord,   src->bs_var_bord,   sizeof(dst->bs_var_bord));
+    memcpy(dst->bs_rel_bord,   src->bs_rel_bord,   sizeof(dst->bs_rel_bord));
+    memcpy(dst->bs_num_rel,    src->bs_num_rel,    sizeof(dst->bs_rel_bord));
+    dst->bs_amp_res     = src->bs_amp_res;
+    dst->bs_num_noise   = src->bs_num_noise;
+    dst->bs_pointer     = src->bs_pointer;
+    dst->bs_frame_class = src->bs_frame_class;
+}
+
+/// Read how the envelope and noise floor data is delta coded
+static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
+                          SBRData *ch_data)
+{
+    get_bits1_vector(gb, ch_data->bs_df_env,   ch_data->bs_num_env[1]);
+    get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
+}
+
+/// Read inverse filtering data
+static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
+                          SBRData *ch_data)
+{
+    int i;
+
+    memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
+    for (i = 0; i < sbr->n_q; i++)
+        ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
+}
+
+static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
+                              SBRData *ch_data, int ch)
+{
+    int bits;
+    int i, j, k;
+    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
+    int t_lav, f_lav;
+    const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
+    const int odd = sbr->n[1] & 1;
+
+    if (sbr->bs_coupling && ch) {
+        if (ch_data->bs_amp_res) {
+            bits   = 5;
+            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
+            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
+            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
+            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
+        } else {
+            bits   = 6;
+            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
+            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
+            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
+            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
+        }
+    } else {
+        if (ch_data->bs_amp_res) {
+            bits   = 6;
+            t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
+            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
+            f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
+            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
+        } else {
+            bits   = 7;
+            t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
+            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
+            f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
+            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
+        }
+    }
+
+    for (i = 0; i < ch_data->bs_num_env[1]; i++) {
+        if (ch_data->bs_df_env[i]) {
+            // bs_freq_res[0] == bs_freq_res[bs_num_env[1]] from prev frame
+            if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
+                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
+                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
+            } else if (ch_data->bs_freq_res[i + 1]) {
+                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
+                    k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
+                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
+                }
+            } else {
+                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
+                    k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
+                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
+                }
+            }
+        } else {
+            ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
+            for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
+                ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
+        }
+    }
+
+    //assign 0th elements of env_facs from last elements
+    memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env[1]],
+           sizeof(ch_data->env_facs[0]));
+}
+
+static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
+                           SBRData *ch_data, int ch)
+{
+    int i, j;
+    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
+    int t_lav, f_lav;
+    int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
+
+    if (sbr->bs_coupling && ch) {
+        t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
+        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
+        f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
+        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
+    } else {
+        t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
+        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
+        f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
+        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
+    }
+
+    for (i = 0; i < ch_data->bs_num_noise; i++) {
+        if (ch_data->bs_df_noise[i]) {
+            for (j = 0; j < sbr->n_q; j++)
+                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
+        } else {
+            ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
+            for (j = 1; j < sbr->n_q; j++)
+                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
+        }
+    }
+
+    //assign 0th elements of noise_facs from last elements
+    memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
+           sizeof(ch_data->noise_facs[0]));
+}
+
+static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
+                               GetBitContext *gb,
+                          int bs_extension_id, int *num_bits_left)
+{
+//TODO - implement ps_data for parametric stereo parsing
+    switch (bs_extension_id) {
+    case EXTENSION_ID_PS:
+#if 0
+        *num_bits_left -= ff_ps_data(gb, ps);
+#else
+        av_log_missing_feature(ac->avccontext, "Parametric Stereo is", 0);
+        skip_bits_long(gb, *num_bits_left); // bs_fill_bits
+        *num_bits_left = 0;
+#endif
+        break;
+    default:
+        av_log_missing_feature(ac->avccontext, "Reserved SBR extensions are", 1);
+        skip_bits_long(gb, *num_bits_left); // bs_fill_bits
+        *num_bits_left = 0;
+        break;
+    }
+}
+
+static void read_sbr_single_channel_element(AACContext *ac,
+                                            SpectralBandReplication *sbr,
+                                            GetBitContext *gb)
+{
+    if (get_bits1(gb)) // bs_data_extra
+        skip_bits(gb, 4); // bs_reserved
+
+    read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
+    read_sbr_dtdf(sbr, gb, &sbr->data[0]);
+    read_sbr_invf(sbr, gb, &sbr->data[0]);
+    read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
+    read_sbr_noise(sbr, gb, &sbr->data[0], 0);
+
+    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
+        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
+}
+
+static void read_sbr_channel_pair_element(AACContext *ac,
+                                          SpectralBandReplication *sbr,
+                                          GetBitContext *gb)
+{
+    if (get_bits1(gb))    // bs_data_extra
+        skip_bits(gb, 8); // bs_reserved
+
+    if ((sbr->bs_coupling = get_bits1(gb))) {
+        read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
+        copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
+        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
+        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
+        read_sbr_invf(sbr, gb, &sbr->data[0]);
+        memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
+        memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
+        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
+        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
+        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
+        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
+    } else {
+        read_sbr_grid(ac, sbr, gb, &sbr->data[0]);
+        read_sbr_grid(ac, sbr, gb, &sbr->data[1]);
+        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
+        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
+        read_sbr_invf(sbr, gb, &sbr->data[0]);
+        read_sbr_invf(sbr, gb, &sbr->data[1]);
+        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
+        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
+        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
+        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
+    }
+
+    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
+        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
+    if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
+        get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
+}
+
+static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
+                                  GetBitContext *gb, int id_aac)
+{
+    unsigned int cnt = get_bits_count(gb);
+
+    if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
+        read_sbr_single_channel_element(ac, sbr, gb);
+    } else if (id_aac == TYPE_CPE) {
+        read_sbr_channel_pair_element(ac, sbr, gb);
+    } else {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+            "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
+        sbr->start = 0;
+        return get_bits_count(gb) - cnt;
+    }
+    if (get_bits1(gb)) { // bs_extended_data
+        int num_bits_left = get_bits(gb, 4); // bs_extension_size
+        if (num_bits_left == 15)
+            num_bits_left += get_bits(gb, 8); // bs_esc_count
+
+        num_bits_left <<= 3;
+        while (num_bits_left > 7) {
+            num_bits_left -= 2;
+            read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
+        }
+    }
+
+    return get_bits_count(gb) - cnt;
+}
+
+static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
+{
+    int err;
+    err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
+    if (err >= 0)
+        err = sbr_make_f_derived(ac, sbr);
+    if (err < 0) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "SBR reset failed. Switching SBR to pure upsampling mode.\n");
+        sbr->start = 0;
+    }
+}
+
+/**
+ * Decode Spectral Band Replication extension data; reference: table 4.55.
+ *
+ * @param   crc flag indicating the presence of CRC checksum
+ * @param   cnt length of TYPE_FIL syntactic element in bytes
+ *
+ * @return  Returns number of bytes consumed from the TYPE_FIL element.
+ */
+int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
+                            GetBitContext *gb_host, int crc, int cnt, int id_aac)
+{
+    unsigned int num_sbr_bits = 0, num_align_bits;
+    unsigned bytes_read;
+    GetBitContext gbc = *gb_host, *gb = &gbc;
+    skip_bits_long(gb_host, cnt*8 - 4);
+
+    sbr->reset = 0;
+
+    if (!sbr->sample_rate)
+        sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
+    if (!ac->m4ac.ext_sample_rate)
+        ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
+
+    if (crc) {
+        skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
+        num_sbr_bits += 10;
+    }
+
+    //Save some state from the previous frame.
+    sbr->kx[0] = sbr->kx[1];
+    sbr->m[0] = sbr->m[1];
+
+    num_sbr_bits++;
+    if (get_bits1(gb)) // bs_header_flag
+        num_sbr_bits += read_sbr_header(sbr, gb);
+
+    if (sbr->reset)
+        sbr_reset(ac, sbr);
+
+    if (sbr->start)
+        num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);
+
+    num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
+    bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
+
+    if (bytes_read > cnt) {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
+    }
+    return cnt;
+}
+
+/// Time/frequency Grid (14496-3 sp04 p200)
+static int sbr_time_freq_grid(AACContext *ac, SpectralBandReplication *sbr,
+                              SBRData *ch_data, int ch)
+{
+    int abs_bord_lead  =  ch_data->bs_frame_class >= 2 ? ch_data->bs_var_bord[0] : 0;
+    // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
+    int abs_bord_trail = (ch_data->bs_frame_class & 1 ? ch_data->bs_var_bord[1] : 0) + 16;
+    int n_rel_lead;
+    int i;
+
+    if (ch_data->bs_frame_class == FIXFIX) {
+        n_rel_lead = ch_data->bs_num_env[1] - 1;
+    } else if (ch_data->bs_frame_class == FIXVAR) {
+        n_rel_lead = 0;
+    } else if (ch_data->bs_frame_class < 4) { // VARFIX or VARVAR
+        n_rel_lead = ch_data->bs_num_rel[0];
+    } else {
+        av_log(ac->avccontext, AV_LOG_ERROR,
+               "Invalid bs_frame_class for SBR: %d\n", ch_data->bs_frame_class);
+        return -1;
+    }
+
+    ch_data->t_env_num_env_old = ch_data->t_env[ch_data->bs_num_env[0]];
+    ch_data->t_env[0]                      = abs_bord_lead;
+    ch_data->t_env[ch_data->bs_num_env[1]] = abs_bord_trail;
+
+    if (ch_data->bs_frame_class == FIXFIX) {
+        int temp = (abs_bord_trail + (ch_data->bs_num_env[1] >> 1)) /
+                   ch_data->bs_num_env[1];
+        for (i = 0; i < n_rel_lead; i++)
+            ch_data->t_env[i + 1] = ch_data->t_env[i] + temp;
+    } else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR
+        for (i = 0; i < n_rel_lead; i++)
+            ch_data->t_env[i + 1] = ch_data->t_env[i] + ch_data->bs_rel_bord[0][i];
+    } else { // FIXVAR
+        for (i = 0; i < n_rel_lead; i++)
+            ch_data->t_env[i + 1] = abs_bord_lead;
+    }
+
+    if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
+        for (i = ch_data->bs_num_env[1] - 1; i > n_rel_lead; i--)
+            ch_data->t_env[i] = ch_data->t_env[i + 1] -
+                                ch_data->bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i];
+    } else { // FIXFIX or VARFIX
+        for (i = n_rel_lead; i < ch_data->bs_num_env[1]; i++)
+            ch_data->t_env[i + 1] = abs_bord_trail;
+    }
+
+    ch_data->t_q[0] = ch_data->t_env[0];
+    if (ch_data->bs_num_noise > 1) { // typo in spec bases this on bs_num_env...
+        unsigned int idx;
+        if (ch_data->bs_frame_class == FIXFIX) {
+            idx = ch_data->bs_num_env[1] >> 1;
+        } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
+            idx = ch_data->bs_num_env[1] - FFMAX(ch_data->bs_pointer - 1, 1);
+        } else { // VARFIX
+            if (!ch_data->bs_pointer)
+                idx = 1;
+            else if (ch_data->bs_pointer == 1)
+                idx = ch_data->bs_num_env[1] - 1;
+            else // bs_pointer > 1
+                idx = ch_data->bs_pointer - 1;
+        }
+        ch_data->t_q[1] = ch_data->t_env[idx];
+        ch_data->t_q[2] = ch_data->t_env[ch_data->bs_num_env[1]];
+    } else
+        ch_data->t_q[1] = ch_data->t_env[ch_data->bs_num_env[1]];
+
+    return 0;
+}
+
+/// Dequantization and stereo decoding (14496-3 sp04 p203)
+static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
+{
+    int k, e;
+    int ch;
+
+    if (id_aac == TYPE_CPE && sbr->bs_coupling) {
+        float alpha      = sbr->data[0].bs_amp_res ?  1.0f :  0.5f;
+        float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
+        for (e = 1; e <= sbr->data[0].bs_num_env[1]; e++) {
+            for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
+                float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
+                float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
+                float fac   = temp1 / (1.0f + temp2);
+                sbr->data[0].env_facs[e][k] = fac;
+                sbr->data[1].env_facs[e][k] = fac * temp2;
+            }
+        }
+        for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
+            for (k = 0; k < sbr->n_q; k++) {
+                float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
+                float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
+                float fac   = temp1 / (1.0f + temp2);
+                sbr->data[0].noise_facs[e][k] = fac;
+                sbr->data[1].noise_facs[e][k] = fac * temp2;
+            }
+        }
+    } else { // SCE or one non-coupled CPE
+        for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
+            float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
+            for (e = 1; e <= sbr->data[ch].bs_num_env[1]; e++)
+                for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
+                    sbr->data[ch].env_facs[e][k] =
+                        exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
+            for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
+                for (k = 0; k < sbr->n_q; k++)
+                    sbr->data[ch].noise_facs[e][k] =
+                        exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
+        }
+    }
+}
+
+/**
+ * Analysis QMF Bank (14496-3 sp04 p206)
+ *
+ * @param   x       pointer to the beginning of the first sample window
+ * @param   W       array of complex-valued samples split into subbands
+ */
+static void sbr_qmf_analysis(DSPContext *dsp, RDFTContext *rdft, const float *in, float *x,
+                             float z[320], float W[2][32][32][2],
+                             float bias, float scale)
+{
+    int i, k;
+    memcpy(W[0], W[1], sizeof(W[0]));
+    memcpy(x    , x+1024, (320-32)*sizeof(x[0]));
+    if (scale != 1.0f || bias != 0.0f)
+        for (i = 0; i < 1024; i++)
+            x[288 + i] = (in[i] - bias) * scale;
+    else
+        memcpy(x+288, in, 1024*sizeof(*x));
+    for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
+                               // are not supported
+        float re, im;
+        dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
+        for (k = 0; k < 64; k++) {
+            float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
+            z[k] = f * analysis_cos_pre[k];
+            z[k+64] = f;
+        }
+        ff_rdft_calc(rdft, z);
+        re = z[0] * 0.5f;
+        im = 0.5f * dsp->scalarproduct_float(z+64, analysis_sin_pre, 64);
+        W[1][i][0][0] = re * analysis_cossin_post[0][0] - im * analysis_cossin_post[0][1];
+        W[1][i][0][1] = re * analysis_cossin_post[0][1] + im * analysis_cossin_post[0][0];
+        for (k = 1; k < 32; k++) {
+            re = z[2*k  ] - re;
+            im = z[2*k+1] - im;
+            W[1][i][k][0] = re * analysis_cossin_post[k][0] - im * analysis_cossin_post[k][1];
+            W[1][i][k][1] = re * analysis_cossin_post[k][1] + im * analysis_cossin_post[k][0];
+        }
+        x += 32;
+    }
+}
+
+/**
+ * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
+ * (14496-3 sp04 p206)
+ */
+static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
+                              float *out, float X[2][32][64],
+                              float mdct_buf[2][64],
+                              float *v0, int *v_off, const unsigned int div,
+                              float bias, float scale)
+{
+    int i, n;
+    const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
+    int scale_and_bias = scale != 1.0f || bias != 0.0f;
+    float *v;
+    for (i = 0; i < 32; i++) {
+        if (*v_off == 0) {
+            int saved_samples = (1280 - 128) >> div;
+            memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
+            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
+        } else {
+            *v_off -= 128 >> div;
+        }
+        v = v0 + *v_off;
+        for (n = 1; n < 64 >> div; n+=2) {
+            X[1][i][n] = -X[1][i][n];
+        }
+        if (div) {
+            memset(X[0][i]+32, 0, 32*sizeof(float));
+            memset(X[1][i]+32, 0, 32*sizeof(float));
+        }
+        ff_imdct_half(mdct, mdct_buf[0], X[0][i]);
+        ff_imdct_half(mdct, mdct_buf[1], X[1][i]);
+        if (div) {
+            for (n = 0; n < 32; n++) {
+                v[      n] = -mdct_buf[0][63 - 2*n] + mdct_buf[1][2*n    ];
+                v[ 63 - n] =  mdct_buf[0][62 - 2*n] + mdct_buf[1][2*n + 1];
+            }
+        } else {
+            for (n = 0; n < 64; n++) {
+                v[      n] = -mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];
+                v[127 - n] =  mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];
+            }
+        }
+        dsp->vector_fmul_add(out, v                , sbr_qmf_window               , zero64, 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);
+        dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);
+        if (scale_and_bias)
+            for (n = 0; n < 64 >> div; n++)
+                out[n] = out[n] * scale + bias;
+        out += 64 >> div;
+    }
+}
+
+static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
+{
+    int i;
+    float real_sum = 0.0f;
+    float imag_sum = 0.0f;
+    if (lag) {
+        for (i = 1; i < 38; i++) {
+            real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
+            imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
+        }
+        phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
+        phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
+        if (lag == 1) {
+            phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
+            phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
+        }
+    } else {
+        for (i = 1; i < 38; i++) {
+            real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
+        }
+        phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
+        phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
+    }
+}
+
+/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
+ * (14496-3 sp04 p214)
+ * Warning: This routine does not seem numerically stable.
+ */
+static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
+                                  const float X_low[32][40][2], int k0)
+{
+    int k;
+    for (k = 0; k < k0; k++) {
+        float phi[3][2][2], dk;
+
+        autocorrelate(X_low[k], phi, 0);
+        autocorrelate(X_low[k], phi, 1);
+        autocorrelate(X_low[k], phi, 2);
+
+        dk =  phi[2][1][0] * phi[1][0][0] -
+             (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
+
+        if (!dk) {
+            alpha1[k][0] = 0;
+            alpha1[k][1] = 0;
+        } else {
+            float temp_real, temp_im;
+            temp_real = phi[0][0][0] * phi[1][1][0] -
+                        phi[0][0][1] * phi[1][1][1] -
+                        phi[0][1][0] * phi[1][0][0];
+            temp_im   = phi[0][0][0] * phi[1][1][1] +
+                        phi[0][0][1] * phi[1][1][0] -
+                        phi[0][1][1] * phi[1][0][0];
+
+            alpha1[k][0] = temp_real / dk;
+            alpha1[k][1] = temp_im   / dk;
+        }
+
+        if (!phi[1][0][0]) {
+            alpha0[k][0] = 0;
+            alpha0[k][1] = 0;
+        } else {
+            float temp_real, temp_im;
+            temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
+                                       alpha1[k][1] * phi[1][1][1];
+            temp_im   = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
+                                       alpha1[k][0] * phi[1][1][1];
+
+            alpha0[k][0] = -temp_real / phi[1][0][0];
+            alpha0[k][1] = -temp_im   / phi[1][0][0];
+        }
+
+        if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
+           alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
+            alpha1[k][0] = 0;
+            alpha1[k][1] = 0;
+            alpha0[k][0] = 0;
+            alpha0[k][1] = 0;
+        }
+    }
+}
+
+/// Chirp Factors (14496-3 sp04 p214)
+static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
+{
+    int i;
+    float new_bw;
+    static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
+
+    for (i = 0; i < sbr->n_q; i++) {
+        if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
+            new_bw = 0.6f;
+        } else
+            new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
+
+        if (new_bw < ch_data->bw_array[i]) {
+            new_bw = 0.75f    * new_bw + 0.25f    * ch_data->bw_array[i];
+        } else
+            new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
+        ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
+    }
+}
+
+/// Generate the subband filtered lowband
+static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
+                      float X_low[32][40][2], const float W[2][32][32][2])
+{
+    int i, k;
+    const int t_HFGen = 8;
+    const int i_f = 32;
+    memset(X_low, 0, 32*sizeof(*X_low));
+    for (k = 0; k < sbr->kx[1]; k++) {
+        for (i = t_HFGen; i < i_f + t_HFGen; i++) {
+            X_low[k][i][0] = W[1][i - t_HFGen][k][0];
+            X_low[k][i][1] = W[1][i - t_HFGen][k][1];
+        }
+    }
+    for (k = 0; k < sbr->kx[0]; k++) {
+        for (i = 0; i < t_HFGen; i++) {
+            X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
+            X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
+        }
+    }
+    return 0;
+}
+
+/// High Frequency Generator (14496-3 sp04 p215)
+static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
+                      float X_high[64][40][2], const float X_low[32][40][2],
+                      const float (*alpha0)[2], const float (*alpha1)[2],
+                      const float bw_array[5], const uint8_t *t_env,
+                      int bs_num_env)
+{
+    int i, j, x;
+    int g = 0;
+    int k = sbr->kx[1];
+    for (j = 0; j < sbr->num_patches; j++) {
+        for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
+            float alpha[4];
+            const int p = sbr->patch_start_subband[j] + x;
+            while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
+                g++;
+            g--;
+
+            if (g < 0) {
+                av_log(ac->avccontext, AV_LOG_ERROR,
+                       "ERROR : no subband found for frequency %d\n", k);
+                return -1;
+            }
+
+            alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
+            alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
+            alpha[2] = alpha0[p][0] * bw_array[g];
+            alpha[3] = alpha0[p][1] * bw_array[g];
+
+            for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
+                const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
+                X_high[k][idx][0] =
+                    X_low[p][idx - 2][0] * alpha[0] -
+                    X_low[p][idx - 2][1] * alpha[1] +
+                    X_low[p][idx - 1][0] * alpha[2] -
+                    X_low[p][idx - 1][1] * alpha[3] +
+                    X_low[p][idx][0];
+                X_high[k][idx][1] =
+                    X_low[p][idx - 2][1] * alpha[0] +
+                    X_low[p][idx - 2][0] * alpha[1] +
+                    X_low[p][idx - 1][1] * alpha[2] +
+                    X_low[p][idx - 1][0] * alpha[3] +
+                    X_low[p][idx][1];
+            }
+        }
+    }
+    if (k < sbr->m[1] + sbr->kx[1])
+        memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
+
+    return 0;
+}
+
+/// Generate the subband filtered lowband
+static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][32][64],
+                     const float X_low[32][40][2], const float Y[2][38][64][2],
+                     int ch)
+{
+    int k, i;
+    const int i_f = 32;
+    const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
+    memset(X, 0, 2*sizeof(*X));
+    for (k = 0; k < sbr->kx[0]; k++) {
+        for (i = 0; i < i_Temp; i++) {
+            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
+            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
+        }
+    }
+    for (; k < sbr->kx[0] + sbr->m[0]; k++) {
+        for (i = 0; i < i_Temp; i++) {
+            X[0][i][k] = Y[0][i + i_f][k][0];
+            X[1][i][k] = Y[0][i + i_f][k][1];
+        }
+    }
+
+    for (k = 0; k < sbr->kx[1]; k++) {
+        for (i = i_Temp; i < i_f; i++) {
+            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
+            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
+        }
+    }
+    for (; k < sbr->kx[1] + sbr->m[1]; k++) {
+        for (i = i_Temp; i < i_f; i++) {
+            X[0][i][k] = Y[1][i][k][0];
+            X[1][i][k] = Y[1][i][k][1];
+        }
+    }
+    return 0;
+}
+
+/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
+ * (14496-3 sp04 p217)
+ */
+static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
+                        SBRData *ch_data, int e_a[2])
+{
+    int e, i, m;
+
+    e_a[0] = -(e_a[1] != ch_data->bs_num_env[0]); // l_APrev
+    e_a[1] = -1;
+    if ((ch_data->bs_frame_class & 1) && ch_data->bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
+        e_a[1] = ch_data->bs_num_env[1] + 1 - ch_data->bs_pointer;
+    } else if ((ch_data->bs_frame_class == 2) && (ch_data->bs_pointer > 1)) // VARFIX and bs_pointer > 1
+        e_a[1] = ch_data->bs_pointer - 1;
+
+    memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
+    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+        const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
+        uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
+        int k;
+
+        for (i = 0; i < ilim; i++)
+            for (m = table[i]; m < table[i + 1]; m++)
+                sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
+
+        // ch_data->bs_num_noise > 1 => 2 noise floors
+        k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
+        for (i = 0; i < sbr->n_q; i++)
+            for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
+                sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
+
+        for (i = 0; i < sbr->n[1]; i++) {
+            if (ch_data->bs_add_harmonic_flag) {
+                const unsigned int m_midpoint =
+                    (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
+
+                ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
+                    (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
+            }
+        }
+
+        for (i = 0; i < ilim; i++) {
+            int additional_sinusoid_present = 0;
+            for (m = table[i]; m < table[i + 1]; m++) {
+                if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
+                    additional_sinusoid_present = 1;
+                    break;
+                }
+            }
+            memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
+                   (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
+        }
+    }
+
+    memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env[1]], sizeof(ch_data->s_indexmapped[0]));
+}
+
+/// Estimation of current envelope (14496-3 sp04 p218)
+static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
+                             SpectralBandReplication *sbr, SBRData *ch_data)
+{
+    int e, i, m;
+
+    if (sbr->bs_interpol_freq) {
+        for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+            const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
+            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
+            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
+
+            for (m = 0; m < sbr->m[1]; m++) {
+                float sum = 0.0f;
+
+                for (i = ilb; i < iub; i++) {
+                    sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
+                           X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
+                }
+                e_curr[e][m] = sum * recip_env_size;
+            }
+        }
+    } else {
+        int k, p;
+
+        for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+            const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
+            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
+            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
+            const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
+
+            for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
+                float sum = 0.0f;
+                const int den = env_size * (table[p + 1] - table[p]);
+
+                for (k = table[p]; k < table[p + 1]; k++) {
+                    for (i = ilb; i < iub; i++) {
+                        sum += X_high[k][i][0] * X_high[k][i][0] +
+                               X_high[k][i][1] * X_high[k][i][1];
+                    }
+                }
+                sum /= den;
+                for (k = table[p]; k < table[p + 1]; k++) {
+                    e_curr[e][k - sbr->kx[1]] = sum;
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
+ * and Calculation of gain (14496-3 sp04 p219)
+ */
+static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
+                          SBRData *ch_data, const int e_a[2])
+{
+    int e, k, m;
+    // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
+    static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
+
+    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+        int delta = !((e == e_a[1]) || (e == e_a[0]));
+        for (k = 0; k < sbr->n_lim; k++) {
+            float gain_boost, gain_max;
+            float sum[2] = { 0.0f, 0.0f };
+            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
+                const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
+                sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
+                sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
+                if (!sbr->s_mapped[e][m]) {
+                    sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
+                                            ((1.0f + sbr->e_curr[e][m]) *
+                                             (1.0f + sbr->q_mapped[e][m] * delta)));
+                } else {
+                    sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
+                                            ((1.0f + sbr->e_curr[e][m]) *
+                                             (1.0f + sbr->q_mapped[e][m])));
+                }
+            }
+            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
+                sum[0] += sbr->e_origmapped[e][m];
+                sum[1] += sbr->e_curr[e][m];
+            }
+            gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
+            gain_max = FFMIN(100000, gain_max);
+            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
+                float q_m_max   = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
+                sbr->q_m[e][m]  = FFMIN(sbr->q_m[e][m], q_m_max);
+                sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
+            }
+            sum[0] = sum[1] = 0.0f;
+            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
+                sum[0] += sbr->e_origmapped[e][m];
+                sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
+                          + sbr->s_m[e][m] * sbr->s_m[e][m]
+                          + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
+            }
+            gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
+            gain_boost = FFMIN(1.584893192, gain_boost);
+            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
+                sbr->gain[e][m] *= gain_boost;
+                sbr->q_m[e][m]  *= gain_boost;
+                sbr->s_m[e][m]  *= gain_boost;
+            }
+        }
+    }
+}
+
+/// Assembling HF Signals (14496-3 sp04 p220)
+static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
+                            SpectralBandReplication *sbr, SBRData *ch_data,
+                            const int e_a[2])
+{
+    int e, i, j, m;
+    const int h_SL = 4 * !sbr->bs_smoothing_mode;
+    const int kx = sbr->kx[1];
+    const int m_max = sbr->m[1];
+    static const float h_smooth[5] = {
+        0.33333333333333,
+        0.30150283239582,
+        0.21816949906249,
+        0.11516383427084,
+        0.03183050093751,
+    };
+    static const int8_t phi[2][4] = {
+        {  1,  0, -1,  0}, // real
+        {  0,  1,  0, -1}, // imaginary
+    };
+    float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
+    int indexnoise = ch_data->f_indexnoise;
+    int indexsine  = ch_data->f_indexsine;
+    memcpy(Y[0], Y[1], sizeof(Y[0]));
+
+    if (sbr->reset) {
+        for (i = 0; i < h_SL; i++) {
+            memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
+            memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0],  m_max * sizeof(sbr->q_m[0][0]));
+        }
+    } else if (h_SL) {
+        memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
+        memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
+    }
+
+    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+        for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
+            memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
+            memcpy(q_temp[h_SL + i], sbr->q_m[e],  m_max * sizeof(sbr->q_m[0][0]));
+        }
+    }
+
+    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
+        for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
+            int phi_sign = (1 - 2*(kx & 1));
+
+            if (h_SL && e != e_a[0] && e != e_a[1]) {
+                for (m = 0; m < m_max; m++) {
+                    const int idx1 = i + h_SL;
+                    float g_filt = 0.0f;
+                    for (j = 0; j <= h_SL; j++)
+                        g_filt += g_temp[idx1 - j][m] * h_smooth[j];
+                    Y[1][i][m + kx][0] =
+                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
+                    Y[1][i][m + kx][1] =
+                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
+                }
+            } else {
+                for (m = 0; m < m_max; m++) {
+                    const float g_filt = g_temp[i + h_SL][m];
+                    Y[1][i][m + kx][0] =
+                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
+                    Y[1][i][m + kx][1] =
+                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
+                }
+            }
+
+            if (e != e_a[0] && e != e_a[1]) {
+                for (m = 0; m < m_max; m++) {
+                    indexnoise = (indexnoise + 1) & 0x1ff;
+                    if (sbr->s_m[e][m]) {
+                        Y[1][i][m + kx][0] +=
+                            sbr->s_m[e][m] * phi[0][indexsine];
+                        Y[1][i][m + kx][1] +=
+                            sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
+                    } else {
+                        float q_filt;
+                        if (h_SL) {
+                            const int idx1 = i + h_SL;
+                            q_filt = 0.0f;
+                            for (j = 0; j <= h_SL; j++)
+                                q_filt += q_temp[idx1 - j][m] * h_smooth[j];
+                        } else {
+                            q_filt = q_temp[i][m];
+                        }
+                        Y[1][i][m + kx][0] +=
+                            q_filt * sbr_noise_table[indexnoise][0];
+                        Y[1][i][m + kx][1] +=
+                            q_filt * sbr_noise_table[indexnoise][1];
+                    }
+                    phi_sign = -phi_sign;
+                }
+            } else {
+                indexnoise = (indexnoise + m_max) & 0x1ff;
+                for (m = 0; m < m_max; m++) {
+                    Y[1][i][m + kx][0] +=
+                        sbr->s_m[e][m] * phi[0][indexsine];
+                    Y[1][i][m + kx][1] +=
+                        sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
+                    phi_sign = -phi_sign;
+                }
+            }
+            indexsine = (indexsine + 1) & 3;
+        }
+    }
+    ch_data->f_indexnoise = indexnoise;
+    ch_data->f_indexsine  = indexsine;
+}
+
+void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac)
+{
+    int ch;
+
+    if (sbr->start) {
+        for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
+            sbr_time_freq_grid(ac, sbr, &sbr->data[ch], ch);
+        }
+        sbr_dequant(sbr, id_aac);
+    }
+}
+
+void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
+                  const float* in, float* out)
+{
+    int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
+
+    /* decode channel */
+    sbr_qmf_analysis(&ac->dsp, &sbr->rdft, in, sbr->data[ch].analysis_filterbank_samples,
+                     (float*)sbr->qmf_filter_scratch,
+                     sbr->data[ch].W, ac->add_bias, 1/(-1024 * ac->sf_scale));
+    sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
+    if (sbr->start) {
+        sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
+        sbr_chirp(sbr, &sbr->data[ch]);
+        sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
+                   sbr->data[ch].bw_array, sbr->data[ch].t_env,
+                   sbr->data[ch].bs_num_env[1]);
+
+        // hf_adj
+        sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
+        sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
+        sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
+        sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
+                        sbr->data[ch].e_a);
+    }
+
+    /* synthesis */
+    sbr_x_gen(sbr, sbr->X, sbr->X_low, sbr->data[ch].Y, ch);
+    sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, out, sbr->X, sbr->qmf_filter_scratch,
+                      sbr->data[ch].synthesis_filterbank_samples,
+                      &sbr->data[ch].synthesis_filterbank_samples_offset,
+                      downsampled,
+                      ac->add_bias, -1024 * ac->sf_scale);
+}
diff --git a/libavcodec/aacsbr.h b/libavcodec/aacsbr.h
new file mode 100644
index 0000000000..c865371b15
--- /dev/null
+++ b/libavcodec/aacsbr.h
@@ -0,0 +1,51 @@
+/*
+ * AAC Spectral Band Replication function declarations
+ * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
+ * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/aacsbr.h
+ * AAC Spectral Band Replication function declarations
+ * @author Robert Swain ( rob opendot cl )
+ */
+
+#ifndef AVCODEC_AACSBR_H
+#define AVCODEC_AACSBR_H
+
+#include "get_bits.h"
+#include "aac.h"
+#include "sbr.h"
+
+/** Initialize SBR. */
+av_cold void ff_aac_sbr_init(void);
+/** Initialize one SBR context. */
+av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr);
+/** Close one SBR context. */
+av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr);
+/** Decode one SBR element. */
+int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
+                            GetBitContext *gb, int crc, int cnt, int id_aac);
+/** Dequantized all channels in one SBR element. */
+void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac);
+/** Apply dequantized SBR to a single AAC channel. */
+void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
+                  const float* in, float* out);
+
+#endif /* AVCODEC_AACSBR_H */
diff --git a/libavcodec/aacsbrdata.h b/libavcodec/aacsbrdata.h
new file mode 100644
index 0000000000..f0bd26799d
--- /dev/null
+++ b/libavcodec/aacsbrdata.h
@@ -0,0 +1,613 @@
+/*
+ * AAC Spectral Band Replication decoding data
+ * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/aacsbrdata.h
+ * AAC Spectral Band Replication decoding data
+ * @author Robert Swain ( rob opendot cl )
+ */
+
+#ifndef AVCODEC_AACSBRDATA_H
+#define AVCODEC_AACSBRDATA_H
+
+#include <stdint.h>
+
+///< Huffman tables for SBR
+
+static const uint8_t t_huffman_env_1_5dB_bits[121] = {
+    18, 18, 18, 18, 18, 18, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 17, 18, 16, 17, 18, 17,
+    16, 16, 16, 16, 15, 14, 14, 13,
+    13, 12, 11, 10,  9,  8,  7,  6,
+     5,  4,  3,  2,  2,  3,  4,  5,
+     6,  7,  8,  9, 10, 12, 13, 14,
+    14, 15, 16, 17, 16, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19,
+};
+
+static const uint32_t t_huffman_env_1_5dB_codes[121] = {
+    0x3ffd6, 0x3ffd7, 0x3ffd8, 0x3ffd9, 0x3ffda, 0x3ffdb, 0x7ffb8, 0x7ffb9,
+    0x7ffba, 0x7ffbb, 0x7ffbc, 0x7ffbd, 0x7ffbe, 0x7ffbf, 0x7ffc0, 0x7ffc1,
+    0x7ffc2, 0x7ffc3, 0x7ffc4, 0x7ffc5, 0x7ffc6, 0x7ffc7, 0x7ffc8, 0x7ffc9,
+    0x7ffca, 0x7ffcb, 0x7ffcc, 0x7ffcd, 0x7ffce, 0x7ffcf, 0x7ffd0, 0x7ffd1,
+    0x7ffd2, 0x7ffd3, 0x1ffe6, 0x3ffd4, 0x0fff0, 0x1ffe9, 0x3ffd5, 0x1ffe7,
+    0x0fff1, 0x0ffec, 0x0ffed, 0x0ffee, 0x07ff4, 0x03ff9, 0x03ff7, 0x01ffa,
+    0x01ff9, 0x00ffb, 0x007fc, 0x003fc, 0x001fd, 0x000fd, 0x0007d, 0x0003d,
+    0x0001d, 0x0000d, 0x00005, 0x00001, 0x00000, 0x00004, 0x0000c, 0x0001c,
+    0x0003c, 0x0007c, 0x000fc, 0x001fc, 0x003fd, 0x00ffa, 0x01ff8, 0x03ff6,
+    0x03ff8, 0x07ff5, 0x0ffef, 0x1ffe8, 0x0fff2, 0x7ffd4, 0x7ffd5, 0x7ffd6,
+    0x7ffd7, 0x7ffd8, 0x7ffd9, 0x7ffda, 0x7ffdb, 0x7ffdc, 0x7ffdd, 0x7ffde,
+    0x7ffdf, 0x7ffe0, 0x7ffe1, 0x7ffe2, 0x7ffe3, 0x7ffe4, 0x7ffe5, 0x7ffe6,
+    0x7ffe7, 0x7ffe8, 0x7ffe9, 0x7ffea, 0x7ffeb, 0x7ffec, 0x7ffed, 0x7ffee,
+    0x7ffef, 0x7fff0, 0x7fff1, 0x7fff2, 0x7fff3, 0x7fff4, 0x7fff5, 0x7fff6,
+    0x7fff7, 0x7fff8, 0x7fff9, 0x7fffa, 0x7fffb, 0x7fffc, 0x7fffd, 0x7fffe,
+    0x7ffff,
+};
+
+static const uint8_t f_huffman_env_1_5dB_bits[121] = {
+    19, 19, 20, 20, 20, 20, 20, 20,
+    20, 19, 20, 20, 20, 20, 19, 20,
+    19, 19, 20, 18, 20, 20, 20, 19,
+    20, 20, 20, 19, 20, 19, 18, 19,
+    18, 18, 17, 18, 17, 17, 17, 16,
+    16, 16, 15, 15, 14, 13, 13, 12,
+    12, 11, 10,  9,  9,  8,  7,  6,
+     5,  4,  3,  2,  2,  3,  4,  5,
+     6,  8,  8,  9, 10, 11, 11, 11,
+    12, 12, 13, 13, 14, 14, 16, 16,
+    17, 17, 18, 18, 18, 18, 18, 18,
+    18, 20, 19, 20, 20, 20, 20, 20,
+    20, 19, 20, 20, 20, 20, 19, 20,
+    18, 20, 20, 19, 19, 20, 20, 20,
+    20, 20, 20, 20, 20, 20, 20, 20,
+    20,
+};
+
+static const uint32_t f_huffman_env_1_5dB_codes[121] = {
+    0x7ffe7, 0x7ffe8, 0xfffd2, 0xfffd3, 0xfffd4, 0xfffd5, 0xfffd6, 0xfffd7,
+    0xfffd8, 0x7ffda, 0xfffd9, 0xfffda, 0xfffdb, 0xfffdc, 0x7ffdb, 0xfffdd,
+    0x7ffdc, 0x7ffdd, 0xfffde, 0x3ffe4, 0xfffdf, 0xfffe0, 0xfffe1, 0x7ffde,
+    0xfffe2, 0xfffe3, 0xfffe4, 0x7ffdf, 0xfffe5, 0x7ffe0, 0x3ffe8, 0x7ffe1,
+    0x3ffe0, 0x3ffe9, 0x1ffef, 0x3ffe5, 0x1ffec, 0x1ffed, 0x1ffee, 0x0fff4,
+    0x0fff3, 0x0fff0, 0x07ff7, 0x07ff6, 0x03ffa, 0x01ffa, 0x01ff9, 0x00ffa,
+    0x00ff8, 0x007f9, 0x003fb, 0x001fc, 0x001fa, 0x000fb, 0x0007c, 0x0003c,
+    0x0001c, 0x0000c, 0x00005, 0x00001, 0x00000, 0x00004, 0x0000d, 0x0001d,
+    0x0003d, 0x000fa, 0x000fc, 0x001fb, 0x003fa, 0x007f8, 0x007fa, 0x007fb,
+    0x00ff9, 0x00ffb, 0x01ff8, 0x01ffb, 0x03ff8, 0x03ff9, 0x0fff1, 0x0fff2,
+    0x1ffea, 0x1ffeb, 0x3ffe1, 0x3ffe2, 0x3ffea, 0x3ffe3, 0x3ffe6, 0x3ffe7,
+    0x3ffeb, 0xfffe6, 0x7ffe2, 0xfffe7, 0xfffe8, 0xfffe9, 0xfffea, 0xfffeb,
+    0xfffec, 0x7ffe3, 0xfffed, 0xfffee, 0xfffef, 0xffff0, 0x7ffe4, 0xffff1,
+    0x3ffec, 0xffff2, 0xffff3, 0x7ffe5, 0x7ffe6, 0xffff4, 0xffff5, 0xffff6,
+    0xffff7, 0xffff8, 0xffff9, 0xffffa, 0xffffb, 0xffffc, 0xffffd, 0xffffe,
+    0xfffff,
+};
+
+static const uint8_t t_huffman_env_bal_1_5dB_bits[49] = {
+    16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 16, 16, 16, 16, 16, 16,
+    16, 16, 12, 11,  9,  7,  5,  3,
+     1,  2,  4,  6,  8, 11, 12, 15,
+    16, 16, 16, 16, 16, 16, 16, 17,
+    17, 17, 17, 17, 17, 17, 17, 17,
+    17,
+};
+
+static const uint32_t t_huffman_env_bal_1_5dB_codes[49] = {
+    0x0ffe4, 0x0ffe5, 0x0ffe6, 0x0ffe7, 0x0ffe8, 0x0ffe9, 0x0ffea, 0x0ffeb,
+    0x0ffec, 0x0ffed, 0x0ffee, 0x0ffef, 0x0fff0, 0x0fff1, 0x0fff2, 0x0fff3,
+    0x0fff4, 0x0ffe2, 0x00ffc, 0x007fc, 0x001fe, 0x0007e, 0x0001e, 0x00006,
+    0x00000, 0x00002, 0x0000e, 0x0003e, 0x000fe, 0x007fd, 0x00ffd, 0x07ff0,
+    0x0ffe3, 0x0fff5, 0x0fff6, 0x0fff7, 0x0fff8, 0x0fff9, 0x0fffa, 0x1fff6,
+    0x1fff7, 0x1fff8, 0x1fff9, 0x1fffa, 0x1fffb, 0x1fffc, 0x1fffd, 0x1fffe,
+    0x1ffff,
+};
+
+static const uint8_t f_huffman_env_bal_1_5dB_bits[49] = {
+    18, 18, 18, 18, 18, 18, 18, 18,
+    18, 18, 18, 18, 18, 18, 18, 16,
+    17, 14, 11, 11,  8,  7,  4,  2,
+     1,  3,  5,  6,  9, 11, 12, 15,
+    16, 18, 18, 18, 18, 18, 18, 18,
+    18, 18, 18, 18, 18, 18, 18, 19,
+    19,
+};
+
+static const uint32_t f_huffman_env_bal_1_5dB_codes[49] = {
+    0x3ffe2, 0x3ffe3, 0x3ffe4, 0x3ffe5, 0x3ffe6, 0x3ffe7, 0x3ffe8, 0x3ffe9,
+    0x3ffea, 0x3ffeb, 0x3ffec, 0x3ffed, 0x3ffee, 0x3ffef, 0x3fff0, 0x0fff7,
+    0x1fff0, 0x03ffc, 0x007fe, 0x007fc, 0x000fe, 0x0007e, 0x0000e, 0x00002,
+    0x00000, 0x00006, 0x0001e, 0x0003e, 0x001fe, 0x007fd, 0x00ffe, 0x07ffa,
+    0x0fff6, 0x3fff1, 0x3fff2, 0x3fff3, 0x3fff4, 0x3fff5, 0x3fff6, 0x3fff7,
+    0x3fff8, 0x3fff9, 0x3fffa, 0x3fffb, 0x3fffc, 0x3fffd, 0x3fffe, 0x7fffe,
+    0x7ffff,
+};
+
+static const uint8_t t_huffman_env_3_0dB_bits[63] = {
+    18, 18, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 17, 16, 16, 16, 14, 14, 14,
+    13, 12, 11,  8,  6,  4,  2,  1,
+     3,  5,  7,  9, 11, 13, 14, 14,
+    15, 16, 17, 18, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19, 19,
+    19, 19, 19, 19, 19, 19, 19,
+};
+
+static const uint32_t t_huffman_env_3_0dB_codes[63] = {
+    0x3ffed, 0x3ffee, 0x7ffde, 0x7ffdf, 0x7ffe0, 0x7ffe1, 0x7ffe2, 0x7ffe3,
+    0x7ffe4, 0x7ffe5, 0x7ffe6, 0x7ffe7, 0x7ffe8, 0x7ffe9, 0x7ffea, 0x7ffeb,
+    0x7ffec, 0x1fff4, 0x0fff7, 0x0fff9, 0x0fff8, 0x03ffb, 0x03ffa, 0x03ff8,
+    0x01ffa, 0x00ffc, 0x007fc, 0x000fe, 0x0003e, 0x0000e, 0x00002, 0x00000,
+    0x00006, 0x0001e, 0x0007e, 0x001fe, 0x007fd, 0x01ffb, 0x03ff9, 0x03ffc,
+    0x07ffa, 0x0fff6, 0x1fff5, 0x3ffec, 0x7ffed, 0x7ffee, 0x7ffef, 0x7fff0,
+    0x7fff1, 0x7fff2, 0x7fff3, 0x7fff4, 0x7fff5, 0x7fff6, 0x7fff7, 0x7fff8,
+    0x7fff9, 0x7fffa, 0x7fffb, 0x7fffc, 0x7fffd, 0x7fffe, 0x7ffff,
+};
+
+static const uint8_t f_huffman_env_3_0dB_bits[63] = {
+    20, 20, 20, 20, 20, 20, 20, 18,
+    19, 19, 19, 19, 18, 18, 20, 19,
+    17, 18, 17, 16, 16, 15, 14, 12,
+    11, 10,  9,  8,  6,  4,  2,  1,
+     3,  5,  8,  9, 10, 11, 12, 13,
+    14, 15, 15, 16, 16, 17, 17, 18,
+    18, 18, 20, 19, 19, 19, 20, 19,
+    19, 20, 20, 20, 20, 20, 20,
+};
+
+static const uint32_t f_huffman_env_3_0dB_codes[63] = {
+    0xffff0, 0xffff1, 0xffff2, 0xffff3, 0xffff4, 0xffff5, 0xffff6, 0x3fff3,
+    0x7fff5, 0x7ffee, 0x7ffef, 0x7fff6, 0x3fff4, 0x3fff2, 0xffff7, 0x7fff0,
+    0x1fff5, 0x3fff0, 0x1fff4, 0x0fff7, 0x0fff6, 0x07ff8, 0x03ffb, 0x00ffd,
+    0x007fd, 0x003fd, 0x001fd, 0x000fd, 0x0003e, 0x0000e, 0x00002, 0x00000,
+    0x00006, 0x0001e, 0x000fc, 0x001fc, 0x003fc, 0x007fc, 0x00ffc, 0x01ffc,
+    0x03ffa, 0x07ff9, 0x07ffa, 0x0fff8, 0x0fff9, 0x1fff6, 0x1fff7, 0x3fff5,
+    0x3fff6, 0x3fff1, 0xffff8, 0x7fff1, 0x7fff2, 0x7fff3, 0xffff9, 0x7fff7,
+    0x7fff4, 0xffffa, 0xffffb, 0xffffc, 0xffffd, 0xffffe, 0xfffff,
+};
+
+static const uint8_t t_huffman_env_bal_3_0dB_bits[25] = {
+    13, 13, 13, 13, 13, 13, 13, 12,
+     8,  7,  4,  3,  1,  2,  5,  6,
+     9, 13, 13, 13, 13, 13, 13, 14,
+    14,
+};
+
+static const uint16_t t_huffman_env_bal_3_0dB_codes[25] = {
+    0x1ff2, 0x1ff3, 0x1ff4, 0x1ff5, 0x1ff6, 0x1ff7, 0x1ff8, 0x0ff8,
+    0x00fe, 0x007e, 0x000e, 0x0006, 0x0000, 0x0002, 0x001e, 0x003e,
+    0x01fe, 0x1ff9, 0x1ffa, 0x1ffb, 0x1ffc, 0x1ffd, 0x1ffe, 0x3ffe,
+    0x3fff,
+};
+
+static const uint8_t f_huffman_env_bal_3_0dB_bits[25] = {
+    13, 13, 13, 13, 13, 14, 14, 11,
+     8,  7,  4,  2,  1,  3,  5,  6,
+     9, 12, 13, 14, 14, 14, 14, 14,
+    14,
+};
+
+static const uint16_t f_huffman_env_bal_3_0dB_codes[25] = {
+    0x1ff7, 0x1ff8, 0x1ff9, 0x1ffa, 0x1ffb, 0x3ff8, 0x3ff9, 0x07fc,
+    0x00fe, 0x007e, 0x000e, 0x0002, 0x0000, 0x0006, 0x001e, 0x003e,
+    0x01fe, 0x0ffa, 0x1ff6, 0x3ffa, 0x3ffb, 0x3ffc, 0x3ffd, 0x3ffe,
+    0x3fff,
+};
+
+static const uint8_t t_huffman_noise_3_0dB_bits[63] = {
+    13, 13, 13, 13, 13, 13, 13, 13,
+    13, 13, 13, 13, 13, 13, 13, 13,
+    13, 13, 13, 13, 13, 13, 13, 13,
+    13, 13, 11,  8,  6,  4,  3,  1,
+     2,  5,  8, 10, 13, 13, 13, 13,
+    13, 13, 13, 13, 13, 13, 13, 13,
+    13, 13, 13, 13, 13, 13, 13, 13,
+    13, 13, 13, 13, 13, 14, 14,
+};
+
+static const uint16_t t_huffman_noise_3_0dB_codes[63] = {
+    0x1fce, 0x1fcf, 0x1fd0, 0x1fd1, 0x1fd2, 0x1fd3, 0x1fd4, 0x1fd5,
+    0x1fd6, 0x1fd7, 0x1fd8, 0x1fd9, 0x1fda, 0x1fdb, 0x1fdc, 0x1fdd,
+    0x1fde, 0x1fdf, 0x1fe0, 0x1fe1, 0x1fe2, 0x1fe3, 0x1fe4, 0x1fe5,
+    0x1fe6, 0x1fe7, 0x07f2, 0x00fd, 0x003e, 0x000e, 0x0006, 0x0000,
+    0x0002, 0x001e, 0x00fc, 0x03f8, 0x1fcc, 0x1fe8, 0x1fe9, 0x1fea,
+    0x1feb, 0x1fec, 0x1fcd, 0x1fed, 0x1fee, 0x1fef, 0x1ff0, 0x1ff1,
+    0x1ff2, 0x1ff3, 0x1ff4, 0x1ff5, 0x1ff6, 0x1ff7, 0x1ff8, 0x1ff9,
+    0x1ffa, 0x1ffb, 0x1ffc, 0x1ffd, 0x1ffe, 0x3ffe, 0x3fff,
+};
+
+static const uint8_t t_huffman_noise_bal_3_0dB_bits[25] = {
+    8, 8, 8, 8, 8, 8, 8, 8,
+    8, 8, 5, 2, 1, 3, 6, 8,
+    8, 8, 8, 8, 8, 8, 8, 8,
+    8,
+};
+
+static const uint8_t t_huffman_noise_bal_3_0dB_codes[25] = {
+    0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3,
+    0xf4, 0xf5, 0x1c, 0x02, 0x00, 0x06, 0x3a, 0xf6,
+    0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe,
+    0xff,
+};
+
+static const int8_t sbr_offset[6][16] = {
+    {-8, -7, -6, -5, -4, -3, -2, -1,  0,  1,  2,  3,  4,  5,  6,  7}, //             fs_sbr  = 16000 Hz
+    {-5, -4, -3, -2, -1,  0,  1,  2,  3,  4,  5,  6,  7,  9, 11, 13}, //             fs_sbr  = 22050 Hz
+    {-5, -3, -2, -1,  0,  1,  2,  3,  4,  5,  6,  7,  9, 11, 13, 16}, //             fs_sbr  = 24000 Hz
+    {-6, -4, -2, -1,  0,  1,  2,  3,  4,  5,  6,  7,  9, 11, 13, 16}, //             fs_sbr  = 32000 Hz
+    {-4, -2, -1,  0,  1,  2,  3,  4,  5,  6,  7,  9, 11, 13, 16, 20}, // 44100 Hz <= fs_sbr <= 64000 Hz
+    {-2, -1,  0,  1,  2,  3,  4,  5,  6,  7,  9, 11, 13, 16, 20, 24}, // 64000 Hz <  fs_sbr
+};
+
+///< window coefficients for analysis/synthesis QMF banks
+static DECLARE_ALIGNED(16, float, sbr_qmf_window_ds)[320];
+static DECLARE_ALIGNED(16, float, sbr_qmf_window_us)[640] = {
+     0.0000000000, -0.0005525286, -0.0005617692, -0.0004947518,
+    -0.0004875227, -0.0004893791, -0.0005040714, -0.0005226564,
+    -0.0005466565, -0.0005677802, -0.0005870930, -0.0006132747,
+    -0.0006312493, -0.0006540333, -0.0006777690, -0.0006941614,
+    -0.0007157736, -0.0007255043, -0.0007440941, -0.0007490598,
+    -0.0007681371, -0.0007724848, -0.0007834332, -0.0007779869,
+    -0.0007803664, -0.0007801449, -0.0007757977, -0.0007630793,
+    -0.0007530001, -0.0007319357, -0.0007215391, -0.0006917937,
+    -0.0006650415, -0.0006341594, -0.0005946118, -0.0005564576,
+    -0.0005145572, -0.0004606325, -0.0004095121, -0.0003501175,
+    -0.0002896981, -0.0002098337, -0.0001446380, -0.0000617334,
+     0.0000134949,  0.0001094383,  0.0002043017,  0.0002949531,
+     0.0004026540,  0.0005107388,  0.0006239376,  0.0007458025,
+     0.0008608443,  0.0009885988,  0.0011250155,  0.0012577884,
+     0.0013902494,  0.0015443219,  0.0016868083,  0.0018348265,
+     0.0019841140,  0.0021461583,  0.0023017254,  0.0024625616,
+     0.0026201758,  0.0027870464,  0.0029469447,  0.0031125420,
+     0.0032739613,  0.0034418874,  0.0036008268,  0.0037603922,
+     0.0039207432,  0.0040819753,  0.0042264269,  0.0043730719,
+     0.0045209852,  0.0046606460,  0.0047932560,  0.0049137603,
+     0.0050393022,  0.0051407353,  0.0052461166,  0.0053471681,
+     0.0054196775,  0.0054876040,  0.0055475714,  0.0055938023,
+     0.0056220643,  0.0056455196,  0.0056389199,  0.0056266114,
+     0.0055917128,  0.0055404363,  0.0054753783,  0.0053838975,
+     0.0052715758,  0.0051382275,  0.0049839687,  0.0048109469,
+     0.0046039530,  0.0043801861,  0.0041251642,  0.0038456408,
+     0.0035401246,  0.0032091885,  0.0028446757,  0.0024508540,
+     0.0020274176,  0.0015784682,  0.0010902329,  0.0005832264,
+     0.0000276045, -0.0005464280, -0.0011568135, -0.0018039472,
+    -0.0024826723, -0.0031933778, -0.0039401124, -0.0047222596,
+    -0.0055337211, -0.0063792293, -0.0072615816, -0.0081798233,
+    -0.0091325329, -0.0101150215, -0.0111315548, -0.0121849995,
+     0.0132718220,  0.0143904666,  0.0155405553,  0.0167324712,
+     0.0179433381,  0.0191872431,  0.0204531793,  0.0217467550,
+     0.0230680169,  0.0244160992,  0.0257875847,  0.0271859429,
+     0.0286072173,  0.0300502657,  0.0315017608,  0.0329754081,
+     0.0344620948,  0.0359697560,  0.0374812850,  0.0390053679,
+     0.0405349170,  0.0420649094,  0.0436097542,  0.0451488405,
+     0.0466843027,  0.0482165720,  0.0497385755,  0.0512556155,
+     0.0527630746,  0.0542452768,  0.0557173648,  0.0571616450,
+     0.0585915683,  0.0599837480,  0.0613455171,  0.0626857808,
+     0.0639715898,  0.0652247106,  0.0664367512,  0.0676075985,
+     0.0687043828,  0.0697630244,  0.0707628710,  0.0717002673,
+     0.0725682583,  0.0733620255,  0.0741003642,  0.0747452558,
+     0.0753137336,  0.0758008358,  0.0761992479,  0.0764992170,
+     0.0767093490,  0.0768173975,  0.0768230011,  0.0767204924,
+     0.0765050718,  0.0761748321,  0.0757305756,  0.0751576255,
+     0.0744664394,  0.0736406005,  0.0726774642,  0.0715826364,
+     0.0703533073,  0.0689664013,  0.0674525021,  0.0657690668,
+     0.0639444805,  0.0619602779,  0.0598166570,  0.0575152691,
+     0.0550460034,  0.0524093821,  0.0495978676,  0.0466303305,
+     0.0434768782,  0.0401458278,  0.0366418116,  0.0329583930,
+     0.0290824006,  0.0250307561,  0.0207997072,  0.0163701258,
+     0.0117623832,  0.0069636862,  0.0019765601, -0.0032086896,
+    -0.0085711749, -0.0141288827, -0.0198834129, -0.0258227288,
+    -0.0319531274, -0.0382776572, -0.0447806821, -0.0514804176,
+    -0.0583705326, -0.0654409853, -0.0726943300, -0.0801372934,
+    -0.0877547536, -0.0955533352, -0.1035329531, -0.1116826931,
+    -0.1200077984, -0.1285002850, -0.1371551761, -0.1459766491,
+    -0.1549607071, -0.1640958855, -0.1733808172, -0.1828172548,
+    -0.1923966745, -0.2021250176, -0.2119735853, -0.2219652696,
+    -0.2320690870, -0.2423016884, -0.2526480309, -0.2631053299,
+    -0.2736634040, -0.2843214189, -0.2950716717, -0.3059098575,
+    -0.3168278913, -0.3278113727, -0.3388722693, -0.3499914122,
+     0.3611589903,  0.3723795546,  0.3836350013,  0.3949211761,
+     0.4062317676,  0.4175696896,  0.4289119920,  0.4402553754,
+     0.4515996535,  0.4629308085,  0.4742453214,  0.4855253091,
+     0.4967708254,  0.5079817500,  0.5191234970,  0.5302240895,
+     0.5412553448,  0.5522051258,  0.5630789140,  0.5738524131,
+     0.5845403235,  0.5951123086,  0.6055783538,  0.6159109932,
+     0.6261242695,  0.6361980107,  0.6461269695,  0.6559016302,
+     0.6655139880,  0.6749663190,  0.6842353293,  0.6933282376,
+     0.7022388719,  0.7109410426,  0.7194462634,  0.7277448900,
+     0.7358211758,  0.7436827863,  0.7513137456,  0.7587080760,
+     0.7658674865,  0.7727780881,  0.7794287519,  0.7858353120,
+     0.7919735841,  0.7978466413,  0.8034485751,  0.8087695004,
+     0.8138191270,  0.8185776004,  0.8230419890,  0.8272275347,
+     0.8311038457,  0.8346937361,  0.8379717337,  0.8409541392,
+     0.8436238281,  0.8459818469,  0.8480315777,  0.8497805198,
+     0.8511971524,  0.8523047035,  0.8531020949,  0.8535720573,
+     0.8537385600,
+};
+
+static const float sbr_noise_table[512][2] = {
+{-0.99948153278296, -0.59483417516607}, { 0.97113454393991, -0.67528515225647},
+{ 0.14130051758487, -0.95090983575689}, {-0.47005496701697, -0.37340549728647},
+{ 0.80705063769351,  0.29653668284408}, {-0.38981478896926,  0.89572605717087},
+{-0.01053049862020, -0.66959058036166}, {-0.91266367957293, -0.11522938140034},
+{ 0.54840422910309,  0.75221367176302}, { 0.40009252867955, -0.98929400334421},
+{-0.99867974711855, -0.88147068645358}, {-0.95531076805040,  0.90908757154593},
+{-0.45725933317144, -0.56716323646760}, {-0.72929675029275, -0.98008272727324},
+{ 0.75622801399036,  0.20950329995549}, { 0.07069442601050, -0.78247898470706},
+{ 0.74496252926055, -0.91169004445807}, {-0.96440182703856, -0.94739918296622},
+{ 0.30424629369539, -0.49438267012479}, { 0.66565033746925,  0.64652935542491},
+{ 0.91697008020594,  0.17514097332009}, {-0.70774918760427,  0.52548653416543},
+{-0.70051415345560, -0.45340028808763}, {-0.99496513054797, -0.90071908066973},
+{ 0.98164490790123, -0.77463155528697}, {-0.54671580548181, -0.02570928536004},
+{-0.01689629065389,  0.00287506445732}, {-0.86110349531986,  0.42548583726477},
+{-0.98892980586032, -0.87881132267556}, { 0.51756627678691,  0.66926784710139},
+{-0.99635026409640, -0.58107730574765}, {-0.99969370862163,  0.98369989360250},
+{ 0.55266258627194,  0.59449057465591}, { 0.34581177741673,  0.94879421061866},
+{ 0.62664209577999, -0.74402970906471}, {-0.77149701404973, -0.33883658042801},
+{-0.91592244254432,  0.03687901376713}, {-0.76285492357887, -0.91371867919124},
+{ 0.79788337195331, -0.93180971199849}, { 0.54473080610200, -0.11919206037186},
+{-0.85639281671058,  0.42429854760451}, {-0.92882402971423,  0.27871809078609},
+{-0.11708371046774, -0.99800843444966}, { 0.21356749817493, -0.90716295627033},
+{-0.76191692573909,  0.99768118356265}, { 0.98111043100884, -0.95854459734407},
+{-0.85913269895572,  0.95766566168880}, {-0.93307242253692,  0.49431757696466},
+{ 0.30485754879632, -0.70540034357529}, { 0.85289650925190,  0.46766131791044},
+{ 0.91328082618125, -0.99839597361769}, {-0.05890199924154,  0.70741827819497},
+{ 0.28398686150148,  0.34633555702188}, { 0.95258164539612, -0.54893416026939},
+{-0.78566324168507, -0.75568541079691}, {-0.95789495447877, -0.20423194696966},
+{ 0.82411158711197,  0.96654618432562}, {-0.65185446735885, -0.88734990773289},
+{-0.93643603134666,  0.99870790442385}, { 0.91427159529618, -0.98290505544444},
+{-0.70395684036886,  0.58796798221039}, { 0.00563771969365,  0.61768196727244},
+{ 0.89065051931895,  0.52783352697585}, {-0.68683707712762,  0.80806944710339},
+{ 0.72165342518718, -0.69259857349564}, {-0.62928247730667,  0.13627037407335},
+{ 0.29938434065514, -0.46051329682246}, {-0.91781958879280, -0.74012716684186},
+{ 0.99298717043688,  0.40816610075661}, { 0.82368298622748, -0.74036047190173},
+{-0.98512833386833, -0.99972330709594}, {-0.95915368242257, -0.99237800466040},
+{-0.21411126572790, -0.93424819052545}, {-0.68821476106884, -0.26892306315457},
+{ 0.91851997982317,  0.09358228901785}, {-0.96062769559127,  0.36099095133739},
+{ 0.51646184922287, -0.71373332873917}, { 0.61130721139669,  0.46950141175917},
+{ 0.47336129371299, -0.27333178296162}, { 0.90998308703519,  0.96715662938132},
+{ 0.44844799194357,  0.99211574628306}, { 0.66614891079092,  0.96590176169121},
+{ 0.74922239129237, -0.89879858826087}, {-0.99571588506485,  0.52785521494349},
+{ 0.97401082477563, -0.16855870075190}, { 0.72683747733879, -0.48060774432251},
+{ 0.95432193457128,  0.68849603408441}, {-0.72962208425191, -0.76608443420917},
+{-0.85359479233537,  0.88738125901579}, {-0.81412430338535, -0.97480768049637},
+{-0.87930772356786,  0.74748307690436}, {-0.71573331064977, -0.98570608178923},
+{ 0.83524300028228,  0.83702537075163}, {-0.48086065601423, -0.98848504923531},
+{ 0.97139128574778,  0.80093621198236}, { 0.51992825347895,  0.80247631400510},
+{-0.00848591195325, -0.76670128000486}, {-0.70294374303036,  0.55359910445577},
+{-0.95894428168140, -0.43265504344783}, { 0.97079252950321,  0.09325857238682},
+{-0.92404293670797,  0.85507704027855}, {-0.69506469500450,  0.98633412625459},
+{ 0.26559203620024,  0.73314307966524}, { 0.28038443336943,  0.14537913654427},
+{-0.74138124825523,  0.99310339807762}, {-0.01752795995444, -0.82616635284178},
+{-0.55126773094930, -0.98898543862153}, { 0.97960898850996, -0.94021446752851},
+{-0.99196309146936,  0.67019017358456}, {-0.67684928085260,  0.12631491649378},
+{ 0.09140039465500, -0.20537731453108}, {-0.71658965751996, -0.97788200391224},
+{ 0.81014640078925,  0.53722648362443}, { 0.40616991671205, -0.26469008598449},
+{-0.67680188682972,  0.94502052337695}, { 0.86849774348749, -0.18333598647899},
+{-0.99500381284851, -0.02634122068550}, { 0.84329189340667,  0.10406957462213},
+{-0.09215968531446,  0.69540012101253}, { 0.99956173327206, -0.12358542001404},
+{-0.79732779473535, -0.91582524736159}, { 0.96349973642406,  0.96640458041000},
+{-0.79942778496547,  0.64323902822857}, {-0.11566039853896,  0.28587846253726},
+{-0.39922954514662,  0.94129601616966}, { 0.99089197565987, -0.92062625581587},
+{ 0.28631285179909, -0.91035047143603}, {-0.83302725605608, -0.67330410892084},
+{ 0.95404443402072,  0.49162765398743}, {-0.06449863579434,  0.03250560813135},
+{-0.99575054486311,  0.42389784469507}, {-0.65501142790847,  0.82546114655624},
+{-0.81254441908887, -0.51627234660629}, {-0.99646369485481,  0.84490533520752},
+{ 0.00287840603348,  0.64768261158166}, { 0.70176989408455, -0.20453028573322},
+{ 0.96361882270190,  0.40706967140989}, {-0.68883758192426,  0.91338958840772},
+{-0.34875585502238,  0.71472290693300}, { 0.91980081243087,  0.66507455644919},
+{-0.99009048343881,  0.85868021604848}, { 0.68865791458395,  0.55660316809678},
+{-0.99484402129368, -0.20052559254934}, { 0.94214511408023, -0.99696425367461},
+{-0.67414626793544,  0.49548221180078}, {-0.47339353684664, -0.85904328834047},
+{ 0.14323651387360, -0.94145598222488}, {-0.29268293575672,  0.05759224927952},
+{ 0.43793861458754, -0.78904969892724}, {-0.36345126374441,  0.64874435357162},
+{-0.08750604656825,  0.97686944362527}, {-0.96495267812511, -0.53960305946511},
+{ 0.55526940659947,  0.78891523734774}, { 0.73538215752630,  0.96452072373404},
+{-0.30889773919437, -0.80664389776860}, { 0.03574995626194, -0.97325616900959},
+{ 0.98720684660488,  0.48409133691962}, {-0.81689296271203, -0.90827703628298},
+{ 0.67866860118215,  0.81284503870856}, {-0.15808569732583,  0.85279555024382},
+{ 0.80723395114371, -0.24717418514605}, { 0.47788757329038, -0.46333147839295},
+{ 0.96367554763201,  0.38486749303242}, {-0.99143875716818, -0.24945277239809},
+{ 0.83081876925833, -0.94780851414763}, {-0.58753191905341,  0.01290772389163},
+{ 0.95538108220960, -0.85557052096538}, {-0.96490920476211, -0.64020970923102},
+{-0.97327101028521,  0.12378128133110}, { 0.91400366022124,  0.57972471346930},
+{-0.99925837363824,  0.71084847864067}, {-0.86875903507313, -0.20291699203564},
+{-0.26240034795124, -0.68264554369108}, {-0.24664412953388, -0.87642273115183},
+{ 0.02416275806869,  0.27192914288905}, { 0.82068619590515, -0.85087787994476},
+{ 0.88547373760759, -0.89636802901469}, {-0.18173078152226, -0.26152145156800},
+{ 0.09355476558534,  0.54845123045604}, {-0.54668414224090,  0.95980774020221},
+{ 0.37050990604091, -0.59910140383171}, {-0.70373594262891,  0.91227665827081},
+{-0.34600785879594, -0.99441426144200}, {-0.68774481731008, -0.30238837956299},
+{-0.26843291251234,  0.83115668004362}, { 0.49072334613242, -0.45359708737775},
+{ 0.38975993093975,  0.95515358099121}, {-0.97757125224150,  0.05305894580606},
+{-0.17325552859616, -0.92770672250494}, { 0.99948035025744,  0.58285545563426},
+{-0.64946246527458,  0.68645507104960}, {-0.12016920576437, -0.57147322153312},
+{-0.58947456517751, -0.34847132454388}, {-0.41815140454465,  0.16276422358861},
+{ 0.99885650204884,  0.11136095490444}, {-0.56649614128386, -0.90494866361587},
+{ 0.94138021032330,  0.35281916733018}, {-0.75725076534641,  0.53650549640587},
+{ 0.20541973692630, -0.94435144369918}, { 0.99980371023351,  0.79835913565599},
+{ 0.29078277605775,  0.35393777921520}, {-0.62858772103030,  0.38765693387102},
+{ 0.43440904467688, -0.98546330463232}, {-0.98298583762390,  0.21021524625209},
+{ 0.19513029146934, -0.94239832251867}, {-0.95476662400101,  0.98364554179143},
+{ 0.93379635304810, -0.70881994583682}, {-0.85235410573336, -0.08342347966410},
+{-0.86425093011245, -0.45795025029466}, { 0.38879779059045,  0.97274429344593},
+{ 0.92045124735495, -0.62433652524220}, { 0.89162532251878,  0.54950955570563},
+{-0.36834336949252,  0.96458298020975}, { 0.93891760988045, -0.89968353740388},
+{ 0.99267657565094, -0.03757034316958}, {-0.94063471614176,  0.41332338538963},
+{ 0.99740224117019, -0.16830494996370}, {-0.35899413170555, -0.46633226649613},
+{ 0.05237237274947, -0.25640361602661}, { 0.36703583957424, -0.38653265641875},
+{ 0.91653180367913, -0.30587628726597}, { 0.69000803499316,  0.90952171386132},
+{-0.38658751133527,  0.99501571208985}, {-0.29250814029851,  0.37444994344615},
+{-0.60182204677608,  0.86779651036123}, {-0.97418588163217,  0.96468523666475},
+{ 0.88461574003963,  0.57508405276414}, { 0.05198933055162,  0.21269661669964},
+{-0.53499621979720,  0.97241553731237}, {-0.49429560226497,  0.98183865291903},
+{-0.98935142339139, -0.40249159006933}, {-0.98081380091130, -0.72856895534041},
+{-0.27338148835532,  0.99950922447209}, { 0.06310802338302, -0.54539587529618},
+{-0.20461677199539, -0.14209977628489}, { 0.66223843141647,  0.72528579940326},
+{-0.84764345483665,  0.02372316801261}, {-0.89039863483811,  0.88866581484602},
+{ 0.95903308477986,  0.76744927173873}, { 0.73504123909879, -0.03747203173192},
+{-0.31744434966056, -0.36834111883652}, {-0.34110827591623,  0.40211222807691},
+{ 0.47803883714199, -0.39423219786288}, { 0.98299195879514,  0.01989791390047},
+{-0.30963073129751, -0.18076720599336}, { 0.99992588229018, -0.26281872094289},
+{-0.93149731080767, -0.98313162570490}, { 0.99923472302773, -0.80142993767554},
+{-0.26024169633417, -0.75999759855752}, {-0.35712514743563,  0.19298963768574},
+{-0.99899084509530,  0.74645156992493}, { 0.86557171579452,  0.55593866696299},
+{ 0.33408042438752,  0.86185953874709}, { 0.99010736374716,  0.04602397576623},
+{-0.66694269691195, -0.91643611810148}, { 0.64016792079480,  0.15649530836856},
+{ 0.99570534804836,  0.45844586038111}, {-0.63431466947340,  0.21079116459234},
+{-0.07706847005931, -0.89581437101329}, { 0.98590090577724,  0.88241721133981},
+{ 0.80099335254678, -0.36851896710853}, { 0.78368131392666,  0.45506999802597},
+{ 0.08707806671691,  0.80938994918745}, {-0.86811883080712,  0.39347308654705},
+{-0.39466529740375, -0.66809432114456}, { 0.97875325649683, -0.72467840967746},
+{-0.95038560288864,  0.89563219587625}, { 0.17005239424212,  0.54683053962658},
+{-0.76910792026848, -0.96226617549298}, { 0.99743281016846,  0.42697157037567},
+{ 0.95437383549973,  0.97002324109952}, { 0.99578905365569, -0.54106826257356},
+{ 0.28058259829990, -0.85361420634036}, { 0.85256524470573, -0.64567607735589},
+{-0.50608540105128, -0.65846015480300}, {-0.97210735183243, -0.23095213067791},
+{ 0.95424048234441, -0.99240147091219}, {-0.96926570524023,  0.73775654896574},
+{ 0.30872163214726,  0.41514960556126}, {-0.24523839572639,  0.63206633394807},
+{-0.33813265086024, -0.38661779441897}, {-0.05826828420146, -0.06940774188029},
+{-0.22898461455054,  0.97054853316316}, {-0.18509915019881,  0.47565762892084},
+{-0.10488238045009, -0.87769947402394}, {-0.71886586182037,  0.78030982480538},
+{ 0.99793873738654,  0.90041310491497}, { 0.57563307626120, -0.91034337352097},
+{ 0.28909646383717,  0.96307783970534}, { 0.42188998312520,  0.48148651230437},
+{ 0.93335049681047, -0.43537023883588}, {-0.97087374418267,  0.86636445711364},
+{ 0.36722871286923,  0.65291654172961}, {-0.81093025665696,  0.08778370229363},
+{-0.26240603062237, -0.92774095379098}, { 0.83996497984604,  0.55839849139647},
+{-0.99909615720225, -0.96024605713970}, { 0.74649464155061,  0.12144893606462},
+{-0.74774595569805, -0.26898062008959}, { 0.95781667469567, -0.79047927052628},
+{ 0.95472308713099, -0.08588776019550}, { 0.48708332746299,  0.99999041579432},
+{ 0.46332038247497,  0.10964126185063}, {-0.76497004940162,  0.89210929242238},
+{ 0.57397389364339,  0.35289703373760}, { 0.75374316974495,  0.96705214651335},
+{-0.59174397685714, -0.89405370422752}, { 0.75087906691890, -0.29612672982396},
+{-0.98607857336230,  0.25034911730023}, {-0.40761056640505, -0.90045573444695},
+{ 0.66929266740477,  0.98629493401748}, {-0.97463695257310, -0.00190223301301},
+{ 0.90145509409859,  0.99781390365446}, {-0.87259289048043,  0.99233587353666},
+{-0.91529461447692, -0.15698707534206}, {-0.03305738840705, -0.37205262859764},
+{ 0.07223051368337, -0.88805001733626}, { 0.99498012188353,  0.97094358113387},
+{-0.74904939500519,  0.99985483641521}, { 0.04585228574211,  0.99812337444082},
+{-0.89054954257993, -0.31791913188064}, {-0.83782144651251,  0.97637632547466},
+{ 0.33454804933804, -0.86231516800408}, {-0.99707579362824,  0.93237990079441},
+{-0.22827527843994,  0.18874759397997}, { 0.67248046289143, -0.03646211390569},
+{-0.05146538187944, -0.92599700120679}, { 0.99947295749905,  0.93625229707912},
+{ 0.66951124390363,  0.98905825623893}, {-0.99602956559179, -0.44654715757688},
+{ 0.82104905483590,  0.99540741724928}, { 0.99186510988782,  0.72023001312947},
+{-0.65284592392918,  0.52186723253637}, { 0.93885443798188, -0.74895312615259},
+{ 0.96735248738388,  0.90891816978629}, {-0.22225968841114,  0.57124029781228},
+{-0.44132783753414, -0.92688840659280}, {-0.85694974219574,  0.88844532719844},
+{ 0.91783042091762, -0.46356892383970}, { 0.72556974415690, -0.99899555770747},
+{-0.99711581834508,  0.58211560180426}, { 0.77638976371966,  0.94321834873819},
+{ 0.07717324253925,  0.58638399856595}, {-0.56049829194163,  0.82522301569036},
+{ 0.98398893639988,  0.39467440420569}, { 0.47546946844938,  0.68613044836811},
+{ 0.65675089314631,  0.18331637134880}, { 0.03273375457980, -0.74933109564108},
+{-0.38684144784738,  0.51337349030406}, {-0.97346267944545, -0.96549364384098},
+{-0.53282156061942, -0.91423265091354}, { 0.99817310731176,  0.61133572482148},
+{-0.50254500772635, -0.88829338134294}, { 0.01995873238855,  0.85223515096765},
+{ 0.99930381973804,  0.94578896296649}, { 0.82907767600783, -0.06323442598128},
+{-0.58660709669728,  0.96840773806582}, {-0.17573736667267, -0.48166920859485},
+{ 0.83434292401346, -0.13023450646997}, { 0.05946491307025,  0.20511047074866},
+{ 0.81505484574602, -0.94685947861369}, {-0.44976380954860,  0.40894572671545},
+{-0.89746474625671,  0.99846578838537}, { 0.39677256130792, -0.74854668609359},
+{-0.07588948563079,  0.74096214084170}, { 0.76343198951445,  0.41746629422634},
+{-0.74490104699626,  0.94725911744610}, { 0.64880119792759,  0.41336660830571},
+{ 0.62319537462542, -0.93098313552599}, { 0.42215817594807, -0.07712787385208},
+{ 0.02704554141885, -0.05417518053666}, { 0.80001773566818,  0.91542195141039},
+{-0.79351832348816, -0.36208897989136}, { 0.63872359151636,  0.08128252493444},
+{ 0.52890520960295,  0.60048872455592}, { 0.74238552914587,  0.04491915291044},
+{ 0.99096131449250, -0.19451182854402}, {-0.80412329643109, -0.88513818199457},
+{-0.64612616129736,  0.72198674804544}, { 0.11657770663191, -0.83662833815041},
+{-0.95053182488101, -0.96939905138082}, {-0.62228872928622,  0.82767262846661},
+{ 0.03004475787316, -0.99738896333384}, {-0.97987214341034,  0.36526129686425},
+{-0.99986980746200, -0.36021610299715}, { 0.89110648599879, -0.97894250343044},
+{ 0.10407960510582,  0.77357793811619}, { 0.95964737821728, -0.35435818285502},
+{ 0.50843233159162,  0.96107691266205}, { 0.17006334670615, -0.76854025314829},
+{ 0.25872675063360,  0.99893303933816}, {-0.01115998681937,  0.98496019742444},
+{-0.79598702973261,  0.97138411318894}, {-0.99264708948101, -0.99542822402536},
+{-0.99829663752818,  0.01877138824311}, {-0.70801016548184,  0.33680685948117},
+{-0.70467057786826,  0.93272777501857}, { 0.99846021905254, -0.98725746254433},
+{-0.63364968534650, -0.16473594423746}, {-0.16258217500792, -0.95939125400802},
+{-0.43645594360633, -0.94805030113284}, {-0.99848471702976,  0.96245166923809},
+{-0.16796458968998, -0.98987511890470}, {-0.87979225745213, -0.71725725041680},
+{ 0.44183099021786, -0.93568974498761}, { 0.93310180125532, -0.99913308068246},
+{-0.93941931782002, -0.56409379640356}, {-0.88590003188677,  0.47624600491382},
+{ 0.99971463703691, -0.83889954253462}, {-0.75376385639978,  0.00814643438625},
+{ 0.93887685615875, -0.11284528204636}, { 0.85126435782309,  0.52349251543547},
+{ 0.39701421446381,  0.81779634174316}, {-0.37024464187437, -0.87071656222959},
+{-0.36024828242896,  0.34655735648287}, {-0.93388812549209, -0.84476541096429},
+{-0.65298804552119, -0.18439575450921}, { 0.11960319006843,  0.99899346780168},
+{ 0.94292565553160,  0.83163906518293}, { 0.75081145286948, -0.35533223142265},
+{ 0.56721979748394, -0.24076836414499}, { 0.46857766746029, -0.30140233457198},
+{ 0.97312313923635, -0.99548191630031}, {-0.38299976567017,  0.98516909715427},
+{ 0.41025800019463,  0.02116736935734}, { 0.09638062008048,  0.04411984381457},
+{-0.85283249275397,  0.91475563922421}, { 0.88866808958124, -0.99735267083226},
+{-0.48202429536989, -0.96805608884164}, { 0.27572582416567,  0.58634753335832},
+{-0.65889129659168,  0.58835634138583}, { 0.98838086953732,  0.99994349600236},
+{-0.20651349620689,  0.54593044066355}, {-0.62126416356920, -0.59893681700392},
+{ 0.20320105410437, -0.86879180355289}, {-0.97790548600584,  0.96290806999242},
+{ 0.11112534735126,  0.21484763313301}, {-0.41368337314182,  0.28216837680365},
+{ 0.24133038992960,  0.51294362630238}, {-0.66393410674885, -0.08249679629081},
+{-0.53697829178752, -0.97649903936228}, {-0.97224737889348,  0.22081333579837},
+{ 0.87392477144549, -0.12796173740361}, { 0.19050361015753,  0.01602615387195},
+{-0.46353441212724, -0.95249041539006}, {-0.07064096339021, -0.94479803205886},
+{-0.92444085484466, -0.10457590187436}, {-0.83822593578728, -0.01695043208885},
+{ 0.75214681811150, -0.99955681042665}, {-0.42102998829339,  0.99720941999394},
+{-0.72094786237696, -0.35008961934255}, { 0.78843311019251,  0.52851398958271},
+{ 0.97394027897442, -0.26695944086561}, { 0.99206463477946, -0.57010120849429},
+{ 0.76789609461795, -0.76519356730966}, {-0.82002421836409, -0.73530179553767},
+{ 0.81924990025724,  0.99698425250579}, {-0.26719850873357,  0.68903369776193},
+{-0.43311260380975,  0.85321815947490}, { 0.99194979673836,  0.91876249766422},
+{-0.80692001248487, -0.32627540663214}, { 0.43080003649976, -0.21919095636638},
+{ 0.67709491937357, -0.95478075822906}, { 0.56151770568316, -0.70693811747778},
+{ 0.10831862810749, -0.08628837174592}, { 0.91229417540436, -0.65987351408410},
+{-0.48972893932274,  0.56289246362686}, {-0.89033658689697, -0.71656563987082},
+{ 0.65269447475094,  0.65916004833932}, { 0.67439478141121, -0.81684380846796},
+{-0.47770832416973, -0.16789556203025}, {-0.99715979260878, -0.93565784007648},
+{-0.90889593602546,  0.62034397054380}, {-0.06618622548177, -0.23812217221359},
+{ 0.99430266919728,  0.18812555317553}, { 0.97686402381843, -0.28664534366620},
+{ 0.94813650221268, -0.97506640027128}, {-0.95434497492853, -0.79607978501983},
+{-0.49104783137150,  0.32895214359663}, { 0.99881175120751,  0.88993983831354},
+{ 0.50449166760303, -0.85995072408434}, { 0.47162891065108, -0.18680204049569},
+{-0.62081581361840,  0.75000676218956}, {-0.43867015250812,  0.99998069244322},
+{ 0.98630563232075, -0.53578899600662}, {-0.61510362277374, -0.89515019899997},
+{-0.03841517601843, -0.69888815681179}, {-0.30102157304644, -0.07667808922205},
+{ 0.41881284182683,  0.02188098922282}, {-0.86135454941237,  0.98947480909359},
+{ 0.67226861393788, -0.13494389011014}, {-0.70737398842068, -0.76547349325992},
+{ 0.94044946687963,  0.09026201157416}, {-0.82386352534327,  0.08924768823676},
+{-0.32070666698656,  0.50143421908753}, { 0.57593163224487, -0.98966422921509},
+{-0.36326018419965,  0.07440243123228}, { 0.99979044674350, -0.14130287347405},
+{-0.92366023326932, -0.97979298068180}, {-0.44607178518598, -0.54233252016394},
+{ 0.44226800932956,  0.71326756742752}, { 0.03671907158312,  0.63606389366675},
+{ 0.52175424682195, -0.85396826735705}, {-0.94701139690956, -0.01826348194255},
+{-0.98759606946049,  0.82288714303073}, { 0.87434794743625,  0.89399495655433},
+{-0.93412041758744,  0.41374052024363}, { 0.96063943315511,  0.93116709541280},
+{ 0.97534253457837,  0.86150930812689}, { 0.99642466504163,  0.70190043427512},
+{-0.94705089665984, -0.29580042814306}, { 0.91599807087376, -0.98147830385781},
+};
+
+#endif /* AVCODEC_AACSBRDATA_H */
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 8983f052e4..3d162d7918 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 56
+#define LIBAVCODEC_VERSION_MINOR 57
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavcodec/mpeg4audio.h b/libavcodec/mpeg4audio.h
index 59e8f1135b..69b1b732a2 100644
--- a/libavcodec/mpeg4audio.h
+++ b/libavcodec/mpeg4audio.h
@@ -57,7 +57,7 @@ enum AudioObjectType {
     AOT_AAC_LC,                ///< Y                       Low Complexity
     AOT_AAC_SSR,               ///< N (code in SoC repo)    Scalable Sample Rate
     AOT_AAC_LTP,               ///< N (code in SoC repo)    Long Term Prediction
-    AOT_SBR,                   ///< N (in progress)         Spectral Band Replication
+    AOT_SBR,                   ///< Y                       Spectral Band Replication
     AOT_AAC_SCALABLE,          ///< N                       Scalable
     AOT_TWINVQ,                ///< N                       Twin Vector Quantizer
     AOT_CELP,                  ///< N                       Code Excited Linear Prediction
diff --git a/libavcodec/sbr.h b/libavcodec/sbr.h
new file mode 100644
index 0000000000..5095bdc0cb
--- /dev/null
+++ b/libavcodec/sbr.h
@@ -0,0 +1,187 @@
+/*
+ * Spectral Band Replication definitions and structures
+ * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
+ * Copyright (c) 2010      Alex Converse <alex.converse@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/sbr.h
+ * Spectral Band Replication definitions and structures
+ * @author Robert Swain ( rob opendot cl )
+ */
+
+#ifndef AVCODEC_SBR_H
+#define AVCODEC_SBR_H
+
+#include <stdint.h>
+#include "fft.h"
+
+/**
+ * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
+ */
+typedef struct {
+    uint8_t bs_start_freq;
+    uint8_t bs_stop_freq;
+    uint8_t bs_xover_band;
+
+    /**
+     * @defgroup bs_header_extra_1     Variables associated with bs_header_extra_1
+     * @{
+     */
+    uint8_t bs_freq_scale;
+    uint8_t bs_alter_scale;
+    uint8_t bs_noise_bands;
+    /** @} */
+} SpectrumParameters;
+
+#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
+
+/**
+ * Spectral Band Replication per channel data
+ */
+typedef struct {
+    /**
+     * @defgroup bitstream     Main bitstream data variables
+     * @{
+     */
+    unsigned           bs_frame_class;
+    unsigned           bs_add_harmonic_flag;
+    unsigned           bs_num_env[2];
+    uint8_t            bs_freq_res[7];
+    uint8_t            bs_var_bord[2];
+    uint8_t            bs_num_rel[2];
+    uint8_t            bs_rel_bord[2][3];
+    unsigned           bs_pointer;
+    unsigned           bs_num_noise;
+    uint8_t            bs_df_env[5];
+    uint8_t            bs_df_noise[2];
+    uint8_t            bs_invf_mode[2][5];
+    uint8_t            bs_add_harmonic[48];
+    unsigned           bs_amp_res;
+    /** @} */
+
+    /**
+     * @defgroup state         State variables
+     * @{
+     */
+    DECLARE_ALIGNED(16, float, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
+    DECLARE_ALIGNED(16, float, analysis_filterbank_samples) [1312];
+    int                synthesis_filterbank_samples_offset;
+    ///l_APrev and l_A
+    int                e_a[2];
+    ///Chirp factors
+    float              bw_array[5];
+    ///QMF values of the original signal
+    float              W[2][32][32][2];
+    ///QMF output of the HF adjustor
+    float              Y[2][38][64][2];
+    float              g_temp[42][48];
+    float              q_temp[42][48];
+    uint8_t            s_indexmapped[8][48];
+    ///Envelope scalefactors
+    float              env_facs[6][48];
+    ///Noise scalefactors
+    float              noise_facs[3][5];
+    ///Envelope time borders
+    uint8_t            t_env[8];
+    ///Envelope time border of the last envelope of the previous frame
+    uint8_t            t_env_num_env_old;
+    ///Noise time borders
+    uint8_t            t_q[3];
+    unsigned           f_indexnoise;
+    unsigned           f_indexsine;
+    /** @} */
+} SBRData;
+
+/**
+ * Spectral Band Replication
+ */
+typedef struct {
+    int                sample_rate;
+    int                start;
+    int                reset;
+    SpectrumParameters spectrum_params;
+    int                bs_amp_res_header;
+    /**
+     * @defgroup bs_header_extra_2     variables associated with bs_header_extra_2
+     * @{
+     */
+    unsigned           bs_limiter_bands;
+    unsigned           bs_limiter_gains;
+    unsigned           bs_interpol_freq;
+    unsigned           bs_smoothing_mode;
+    /** @} */
+    unsigned           bs_coupling;
+    unsigned           k[5]; ///< k0, k1, k2
+    ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
+    ///kx' is its value from the previous frame
+    unsigned           kx[2];
+    ///M' and M respectively, M is the number of QMF subbands that use SBR.
+    unsigned           m[2];
+    ///The number of frequency bands in f_master
+    unsigned           n_master;
+    SBRData            data[2];
+    ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
+    unsigned           n[2];
+    ///Number of noise floor bands
+    unsigned           n_q;
+    ///Number of limiter bands
+    unsigned           n_lim;
+    ///The master QMF frequency grouping
+    uint16_t           f_master[49];
+    ///Frequency borders for low resolution SBR
+    uint16_t           f_tablelow[25];
+    ///Frequency borders for high resolution SBR
+    uint16_t           f_tablehigh[49];
+    ///Frequency borders for noise floors
+    uint16_t           f_tablenoise[6];
+    ///Frequency borders for the limiter
+    uint16_t           f_tablelim[29];
+    unsigned           num_patches;
+    uint8_t            patch_num_subbands[6];
+    uint8_t            patch_start_subband[6];
+    ///QMF low frequency input to the HF generator
+    float              X_low[32][40][2];
+    ///QMF output of the HF generator
+    float              X_high[64][40][2];
+    ///QMF values of the reconstructed signal
+    DECLARE_ALIGNED(16, float, X)[2][32][64];
+    ///Zeroth coefficient used to filter the subband signals
+    float              alpha0[64][2];
+    ///First coefficient used to filter the subband signals
+    float              alpha1[64][2];
+    ///Dequantized envelope scalefactors, remapped
+    float              e_origmapped[7][48];
+    ///Dequantized noise scalefactors, remapped
+    float              q_mapped[7][48];
+    ///Sinusoidal presence, remapped
+    uint8_t            s_mapped[7][48];
+    ///Estimated envelope
+    float              e_curr[7][48];
+    ///Amplitude adjusted noise scalefactors
+    float              q_m[7][48];
+    ///Sinusoidal levels
+    float              s_m[7][48];
+    float              gain[7][48];
+    DECLARE_ALIGNED(16, float, qmf_filter_scratch)[5][64];
+    RDFTContext        rdft;
+    FFTContext         mdct;
+} SpectralBandReplication;
+
+#endif /* AVCODEC_SBR_H */