Musepack SV8 demuxer and decoder

Originally committed as revision 10938 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 364 insertions, 0 deletions

diff --git a/libavcodec/mpc8.c b/libavcodec/mpc8.c
new file mode 100644
index 0000000000..c6c62f6611
--- /dev/null
+++ b/libavcodec/mpc8.c
@@ -0,0 +1,364 @@
+/*
+ * Musepack SV8 decoder
+ * Copyright (c) 2007 Konstantin Shishkov
+ *
+ * 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 mpc8.c Musepack SV8 decoder
+ * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
+ * divided into 32 subbands.
+ */
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "dsputil.h"
+#include "random.h"
+
+#ifdef CONFIG_MPEGAUDIO_HP
+#define USE_HIGHPRECISION
+#endif
+#include "mpegaudio.h"
+
+#include "mpc.h"
+#include "mpcdata.h"
+#include "mpc8data.h"
+#include "mpc8huff.h"
+
+static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
+static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
+
+static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
+static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
+
+static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
+{
+    int code = get_bits(gb, mpc8_cnk_len[k-1][n-1] - 1);
+
+    if (code >= mpc8_cnk_lost[k-1][n-1])
+        code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
+
+    return code;
+}
+
+static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
+{
+    int bits = 0;
+    const uint32_t * C = mpc8_cnk[k-1];
+    int code = mpc8_dec_base(gb, k, n);
+
+    do {
+        n--;
+        if (code >= C[n]) {
+            bits |= 1 << n;
+            code -= C[n];
+            C -= 32;
+            k--;
+        }
+    } while(k > 0);
+
+    return bits;
+}
+
+static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
+{
+    if(mpc8_cnk_len[0][m] < 1) return 0;
+    return mpc8_dec_base(gb, 1, m+1);
+}
+
+static int mpc8_get_mask(GetBitContext *gb, int size, int t)
+{
+    int mask = 0;
+
+    if(t && t != size)
+         mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
+    if((t << 1) > size) mask = ~mask;
+
+    return mask;
+}
+
+static int mpc8_decode_init(AVCodecContext * avctx)
+{
+    int i;
+    MPCContext *c = avctx->priv_data;
+    GetBitContext gb;
+    static int vlc_inited = 0;
+
+    if(avctx->extradata_size < 2){
+        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
+        return -1;
+    }
+    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
+    av_init_random(0xDEADBEEF, &c->rnd);
+    dsputil_init(&c->dsp, avctx);
+
+    ff_mpc_init();
+
+    init_get_bits(&gb, avctx->extradata, 16);
+
+    skip_bits(&gb, 3);//sample rate
+    c->maxbands = get_bits(&gb, 5) + 1;
+    skip_bits(&gb, 4);//channels
+    c->MSS = get_bits1(&gb);
+    c->frames = 1 << (get_bits(&gb, 3) * 2);
+
+    if(vlc_inited) return 0;
+    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
+
+    init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
+             mpc8_bands_bits,  1, 1,
+             mpc8_bands_codes, 1, 1, INIT_VLC_USE_STATIC);
+
+    init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
+             mpc8_q1_bits,  1, 1,
+             mpc8_q1_codes, 1, 1, INIT_VLC_USE_STATIC);
+    init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
+             mpc8_q9up_bits,  1, 1,
+             mpc8_q9up_codes, 1, 1, INIT_VLC_USE_STATIC);
+
+    init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
+             mpc8_scfi0_bits,  1, 1,
+             mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_STATIC);
+    init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
+             mpc8_scfi1_bits,  1, 1,
+             mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_STATIC);
+
+    init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
+             mpc8_dscf0_bits,  1, 1,
+             mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_STATIC);
+    init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
+             mpc8_dscf1_bits,  1, 1,
+             mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_STATIC);
+
+    init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
+             mpc8_q3_bits,  1, 1,
+             mpc8_q3_codes, 1, 1,
+             mpc8_q3_syms,  1, 1, INIT_VLC_USE_STATIC);
+    init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
+             mpc8_q4_bits,  1, 1,
+             mpc8_q4_codes, 1, 1,
+             mpc8_q4_syms,  1, 1, INIT_VLC_USE_STATIC);
+
+    for(i = 0; i < 2; i++){
+        init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
+                 &mpc8_res_bits[i],  1, 1,
+                 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+
+        init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
+                 &mpc8_q2_bits[i],  1, 1,
+                 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+
+        init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
+                 &mpc8_q5_bits[i],  1, 1,
+                 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+        init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
+                 &mpc8_q6_bits[i],  1, 1,
+                 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+        init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
+                 &mpc8_q7_bits[i],  1, 1,
+                 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+        init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
+                 &mpc8_q8_bits[i],  1, 1,
+                 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_STATIC);
+    }
+    vlc_inited = 1;
+    return 0;
+}
+
+static int mpc8_decode_frame(AVCodecContext * avctx,
+                            void *data, int *data_size,
+                            uint8_t * buf, int buf_size)
+{
+    MPCContext *c = avctx->priv_data;
+    GetBitContext gb2, *gb = &gb2;
+    int i, j, k, ch, cnt, res, t;
+    Band *bands = c->bands;
+    int off;
+    int maxband, keyframe;
+    int last[2];
+
+    keyframe = c->cur_frame == 0;
+
+    if(keyframe){
+        memset(c->Q, 0, sizeof(c->Q));
+        c->last_bits_used = 0;
+    }
+    init_get_bits(gb, buf, buf_size * 8);
+    skip_bits(gb, c->last_bits_used & 7);
+
+    if(keyframe)
+        maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
+    else{
+        maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
+        if(maxband > 32) maxband -= 33;
+    }
+    c->last_max_band = maxband;
+
+    /* read subband indexes */
+    if(maxband){
+        last[0] = last[1] = 0;
+        for(i = maxband - 1; i >= 0; i--){
+            for(ch = 0; ch < 2; ch++){
+                last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
+                if(last[ch] > 15) last[ch] -= 17;
+                bands[i].res[ch] = last[ch];
+            }
+        }
+        if(c->MSS){
+            int mask;
+
+            cnt = 0;
+            for(i = 0; i < maxband; i++)
+                if(bands[i].res[0] || bands[i].res[1])
+                    cnt++;
+            t = mpc8_get_mod_golomb(gb, cnt);
+            mask = mpc8_get_mask(gb, cnt, t);
+            for(i = maxband - 1; i >= 0; i--)
+                if(bands[i].res[0] || bands[i].res[1]){
+                    bands[i].msf = mask & 1;
+                    mask >>= 1;
+                }
+        }
+    }
+    for(i = maxband; i < c->maxbands; i++)
+        bands[i].res[0] = bands[i].res[1] = 0;
+
+    if(keyframe){
+        for(i = 0; i < 32; i++)
+            c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
+    }
+
+    for(i = 0; i < maxband; i++){
+        if(bands[i].res[0] || bands[i].res[1]){
+            cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
+            if(cnt >= 0){
+                t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
+                if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
+                if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
+            }
+        }
+    }
+
+    for(i = 0; i < maxband; i++){
+        for(ch = 0; ch < 2; ch++){
+            if(!bands[i].res[ch]) continue;
+
+            if(c->oldDSCF[ch][i]){
+                bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
+                c->oldDSCF[ch][i] = 0;
+            }else{
+                t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
+                if(t == 64)
+                    t += get_bits(gb, 6);
+                bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
+            }
+            for(j = 0; j < 2; j++){
+                if((bands[i].scfi[ch] << j) & 2)
+                    bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
+                else{
+                    t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
+                    if(t == 31)
+                        t = 64 + get_bits(gb, 6);
+                    bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
+                }
+            }
+        }
+    }
+
+    for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
+        for(ch = 0; ch < 2; ch++){
+            res = bands[i].res[ch];
+            switch(res){
+            case -1:
+                for(j = 0; j < SAMPLES_PER_BAND; j++)
+                    c->Q[ch][off + j] = (av_random(&c->rnd) & 0x3FC) - 510;
+                break;
+            case 0:
+                break;
+            case 1:
+                for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
+                    cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
+                    t = mpc8_get_mask(gb, 18, cnt);
+                    for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
+                        c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
+                }
+                break;
+            case 2:
+                cnt = 6;//2*mpc8_thres[res]
+                for(j = 0; j < SAMPLES_PER_BAND; j += 3){
+                    t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
+                    c->Q[ch][off + j + 0] = mpc8_idx50[t];
+                    c->Q[ch][off + j + 1] = mpc8_idx51[t];
+                    c->Q[ch][off + j + 2] = mpc8_idx52[t];
+                    cnt = (cnt >> 1) + mpc8_huffq2[t];
+                }
+                break;
+            case 3:
+            case 4:
+                for(j = 0; j < SAMPLES_PER_BAND; j += 2){
+                    t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
+                    c->Q[ch][off + j + 1] = t >> 4;
+                    c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
+                }
+                break;
+            case 5:
+            case 6:
+            case 7:
+            case 8:
+                cnt = 2 * mpc8_thres[res];
+                for(j = 0; j < SAMPLES_PER_BAND; j++){
+                    t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
+                    c->Q[ch][off + j] = t;
+                    cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
+                }
+                break;
+            default:
+                for(j = 0; j < SAMPLES_PER_BAND; j++){
+                    c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
+                    if(res != 9){
+                        c->Q[ch][off + j] <<= res - 9;
+                        c->Q[ch][off + j] |= get_bits(gb, res - 9);
+                    }
+                    c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
+                }
+            }
+        }
+    }
+
+    ff_mpc_dequantize_and_synth(c, maxband, data);
+
+    c->cur_frame++;
+
+    c->last_bits_used = get_bits_count(gb);
+    if(c->cur_frame >= c->frames)
+        c->cur_frame = 0;
+    *data_size =  MPC_FRAME_SIZE * 4;
+
+    return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
+}
+
+AVCodec mpc8_decoder = {
+    "mpc sv8",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_MUSEPACK8,
+    sizeof(MPCContext),
+    mpc8_decode_init,
+    NULL,
+    NULL,
+    mpc8_decode_frame,
+};