vorbis: Rename decoder/encoder files to follow general file naming scheme.

1 files changed, 1668 insertions, 0 deletions

diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
new file mode 100644
index 0000000000..5fa7be1365
--- /dev/null
+++ b/libavcodec/vorbisdec.c
@@ -0,0 +1,1668 @@
+/**
+ * @file
+ * Vorbis I decoder
+ * @author Denes Balatoni  ( dbalatoni programozo hu )
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#undef V_DEBUG
+//#define V_DEBUG
+//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
+
+#include <math.h>
+
+#define ALT_BITSTREAM_READER_LE
+#include "avcodec.h"
+#include "get_bits.h"
+#include "dsputil.h"
+#include "fft.h"
+#include "fmtconvert.h"
+
+#include "vorbis.h"
+#include "xiph.h"
+
+#define V_NB_BITS 8
+#define V_NB_BITS2 11
+#define V_MAX_VLCS (1 << 16)
+#define V_MAX_PARTITIONS (1 << 20)
+
+#ifndef V_DEBUG
+#define AV_DEBUG(...)
+#endif
+
+#undef NDEBUG
+#include <assert.h>
+
+typedef struct {
+    uint_fast8_t dimensions;
+    uint_fast8_t lookup_type;
+    uint_fast8_t maxdepth;
+    VLC vlc;
+    float *codevectors;
+    unsigned int nb_bits;
+} vorbis_codebook;
+
+typedef union  vorbis_floor_u  vorbis_floor_data;
+typedef struct vorbis_floor0_s vorbis_floor0;
+typedef struct vorbis_floor1_s vorbis_floor1;
+struct vorbis_context_s;
+typedef
+int (* vorbis_floor_decode_func)
+    (struct vorbis_context_s *, vorbis_floor_data *, float *);
+typedef struct {
+    uint_fast8_t floor_type;
+    vorbis_floor_decode_func decode;
+    union vorbis_floor_u {
+        struct vorbis_floor0_s {
+            uint_fast8_t  order;
+            uint_fast16_t rate;
+            uint_fast16_t bark_map_size;
+            int_fast32_t *map[2];
+            uint_fast32_t map_size[2];
+            uint_fast8_t  amplitude_bits;
+            uint_fast8_t  amplitude_offset;
+            uint_fast8_t  num_books;
+            uint_fast8_t *book_list;
+            float        *lsp;
+        } t0;
+        struct vorbis_floor1_s {
+            uint_fast8_t partitions;
+            uint8_t      partition_class[32];
+            uint_fast8_t class_dimensions[16];
+            uint_fast8_t class_subclasses[16];
+            uint_fast8_t class_masterbook[16];
+            int_fast16_t subclass_books[16][8];
+            uint_fast8_t multiplier;
+            uint_fast16_t x_list_dim;
+            vorbis_floor1_entry *list;
+        } t1;
+    } data;
+} vorbis_floor;
+
+typedef struct {
+    uint_fast16_t type;
+    uint_fast32_t begin;
+    uint_fast32_t end;
+    unsigned      partition_size;
+    uint_fast8_t  classifications;
+    uint_fast8_t  classbook;
+    int_fast16_t  books[64][8];
+    uint_fast8_t  maxpass;
+    uint_fast16_t ptns_to_read;
+    uint8_t *classifs;
+} vorbis_residue;
+
+typedef struct {
+    uint_fast8_t  submaps;
+    uint_fast16_t coupling_steps;
+    uint_fast8_t *magnitude;
+    uint_fast8_t *angle;
+    uint_fast8_t *mux;
+    uint_fast8_t  submap_floor[16];
+    uint_fast8_t  submap_residue[16];
+} vorbis_mapping;
+
+typedef struct {
+    uint_fast8_t  blockflag;
+    uint_fast16_t windowtype;
+    uint_fast16_t transformtype;
+    uint_fast8_t  mapping;
+} vorbis_mode;
+
+typedef struct vorbis_context_s {
+    AVCodecContext *avccontext;
+    GetBitContext gb;
+    DSPContext dsp;
+    FmtConvertContext fmt_conv;
+
+    FFTContext mdct[2];
+    uint_fast8_t  first_frame;
+    uint_fast32_t version;
+    uint_fast8_t  audio_channels;
+    uint_fast32_t audio_samplerate;
+    uint_fast32_t bitrate_maximum;
+    uint_fast32_t bitrate_nominal;
+    uint_fast32_t bitrate_minimum;
+    uint_fast32_t blocksize[2];
+    const float  *win[2];
+    uint_fast16_t codebook_count;
+    vorbis_codebook *codebooks;
+    uint_fast8_t  floor_count;
+    vorbis_floor *floors;
+    uint_fast8_t  residue_count;
+    vorbis_residue *residues;
+    uint_fast8_t  mapping_count;
+    vorbis_mapping *mappings;
+    uint_fast8_t  mode_count;
+    vorbis_mode  *modes;
+    uint_fast8_t  mode_number; // mode number for the current packet
+    uint_fast8_t  previous_window;
+    float        *channel_residues;
+    float        *channel_floors;
+    float        *saved;
+    float         scale_bias; // for float->int conversion
+} vorbis_context;
+
+/* Helper functions */
+
+#define BARK(x) \
+    (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
+
+static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
+#define VALIDATE_INDEX(idx, limit) \
+    if (idx >= limit) {\
+        av_log(vc->avccontext, AV_LOG_ERROR,\
+               idx_err_str,\
+               (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
+        return -1;\
+    }
+#define GET_VALIDATED_INDEX(idx, bits, limit) \
+    {\
+        idx = get_bits(gb, bits);\
+        VALIDATE_INDEX(idx, limit)\
+    }
+
+static float vorbisfloat2float(uint_fast32_t val)
+{
+    double mant = val & 0x1fffff;
+    long exp    = (val & 0x7fe00000L) >> 21;
+    if (val & 0x80000000)
+        mant = -mant;
+    return ldexp(mant, exp - 20 - 768);
+}
+
+
+// Free all allocated memory -----------------------------------------
+
+static void vorbis_free(vorbis_context *vc)
+{
+    int_fast16_t i;
+
+    av_freep(&vc->channel_residues);
+    av_freep(&vc->channel_floors);
+    av_freep(&vc->saved);
+
+    for (i = 0; i < vc->residue_count; i++)
+        av_free(vc->residues[i].classifs);
+    av_freep(&vc->residues);
+    av_freep(&vc->modes);
+
+    ff_mdct_end(&vc->mdct[0]);
+    ff_mdct_end(&vc->mdct[1]);
+
+    for (i = 0; i < vc->codebook_count; ++i) {
+        av_free(vc->codebooks[i].codevectors);
+        free_vlc(&vc->codebooks[i].vlc);
+    }
+    av_freep(&vc->codebooks);
+
+    for (i = 0; i < vc->floor_count; ++i) {
+        if (vc->floors[i].floor_type == 0) {
+            av_free(vc->floors[i].data.t0.map[0]);
+            av_free(vc->floors[i].data.t0.map[1]);
+            av_free(vc->floors[i].data.t0.book_list);
+            av_free(vc->floors[i].data.t0.lsp);
+        } else {
+            av_free(vc->floors[i].data.t1.list);
+        }
+    }
+    av_freep(&vc->floors);
+
+    for (i = 0; i < vc->mapping_count; ++i) {
+        av_free(vc->mappings[i].magnitude);
+        av_free(vc->mappings[i].angle);
+        av_free(vc->mappings[i].mux);
+    }
+    av_freep(&vc->mappings);
+}
+
+// Parse setup header -------------------------------------------------
+
+// Process codebooks part
+
+static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
+{
+    uint_fast16_t cb;
+    uint8_t  *tmp_vlc_bits;
+    uint32_t *tmp_vlc_codes;
+    GetBitContext *gb = &vc->gb;
+    uint_fast16_t *codebook_multiplicands;
+
+    vc->codebook_count = get_bits(gb, 8) + 1;
+
+    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
+
+    vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
+    tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
+    tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
+    codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
+
+    for (cb = 0; cb < vc->codebook_count; ++cb) {
+        vorbis_codebook *codebook_setup = &vc->codebooks[cb];
+        uint_fast8_t ordered;
+        uint_fast32_t t, used_entries = 0;
+        uint_fast32_t entries;
+
+        AV_DEBUG(" %d. Codebook \n", cb);
+
+        if (get_bits(gb, 24) != 0x564342) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
+            goto error;
+        }
+
+        codebook_setup->dimensions=get_bits(gb, 16);
+        if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
+            goto error;
+        }
+        entries = get_bits(gb, 24);
+        if (entries > V_MAX_VLCS) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
+            goto error;
+        }
+
+        ordered = get_bits1(gb);
+
+        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
+
+        if (!ordered) {
+            uint_fast16_t ce;
+            uint_fast8_t  flag;
+            uint_fast8_t  sparse = get_bits1(gb);
+
+            AV_DEBUG(" not ordered \n");
+
+            if (sparse) {
+                AV_DEBUG(" sparse \n");
+
+                used_entries = 0;
+                for (ce = 0; ce < entries; ++ce) {
+                    flag = get_bits1(gb);
+                    if (flag) {
+                        tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
+                        ++used_entries;
+                    } else
+                        tmp_vlc_bits[ce] = 0;
+                }
+            } else {
+                AV_DEBUG(" not sparse \n");
+
+                used_entries = entries;
+                for (ce = 0; ce < entries; ++ce)
+                    tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
+            }
+        } else {
+            uint_fast16_t current_entry = 0;
+            uint_fast8_t current_length = get_bits(gb, 5)+1;
+
+            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
+
+            used_entries = entries;
+            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
+                uint_fast16_t i, number;
+
+                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
+
+                number = get_bits(gb, ilog(entries - current_entry));
+
+                AV_DEBUG(" number: %d \n", number);
+
+                for (i = current_entry; i < number+current_entry; ++i)
+                    if (i < used_entries)
+                        tmp_vlc_bits[i] = current_length;
+
+                current_entry+=number;
+            }
+            if (current_entry>used_entries) {
+                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
+                goto error;
+            }
+        }
+
+        codebook_setup->lookup_type = get_bits(gb, 4);
+
+        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
+
+// If the codebook is used for (inverse) VQ, calculate codevectors.
+
+        if (codebook_setup->lookup_type == 1) {
+            uint_fast16_t i, j, k;
+            uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
+
+            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
+            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
+            uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
+            uint_fast8_t codebook_sequence_p = get_bits1(gb);
+
+            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
+            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
+
+            for (i = 0; i < codebook_lookup_values; ++i) {
+                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
+
+                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
+                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
+            }
+
+// Weed out unused vlcs and build codevector vector
+            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
+            for (j = 0, i = 0; i < entries; ++i) {
+                uint_fast8_t dim = codebook_setup->dimensions;
+
+                if (tmp_vlc_bits[i]) {
+                    float last = 0.0;
+                    uint_fast32_t lookup_offset = i;
+
+#ifdef V_DEBUG
+                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
+#endif
+
+                    for (k = 0; k < dim; ++k) {
+                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
+                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
+                        if (codebook_sequence_p)
+                            last = codebook_setup->codevectors[j * dim + k];
+                        lookup_offset/=codebook_lookup_values;
+                    }
+                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
+
+#ifdef V_DEBUG
+                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
+                    for (k = 0; k < dim; ++k)
+                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
+                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
+#endif
+
+                    ++j;
+                }
+            }
+            if (j != used_entries) {
+                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
+                goto error;
+            }
+            entries = used_entries;
+        } else if (codebook_setup->lookup_type >= 2) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
+            goto error;
+        }
+
+// Initialize VLC table
+        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
+            goto error;
+        }
+        codebook_setup->maxdepth = 0;
+        for (t = 0; t < entries; ++t)
+            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
+                codebook_setup->maxdepth = tmp_vlc_bits[t];
+
+        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
+            codebook_setup->nb_bits = V_NB_BITS2;
+        else
+            codebook_setup->nb_bits = V_NB_BITS;
+
+        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
+
+        if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
+            goto error;
+        }
+    }
+
+    av_free(tmp_vlc_bits);
+    av_free(tmp_vlc_codes);
+    av_free(codebook_multiplicands);
+    return 0;
+
+// Error:
+error:
+    av_free(tmp_vlc_bits);
+    av_free(tmp_vlc_codes);
+    av_free(codebook_multiplicands);
+    return -1;
+}
+
+// Process time domain transforms part (unused in Vorbis I)
+
+static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t i;
+    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
+
+    for (i = 0; i < vorbis_time_count; ++i) {
+        uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
+
+        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
+
+        if (vorbis_tdtransform) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
+            return -1;
+        }
+    }
+    return 0;
+}
+
+// Process floors part
+
+static int vorbis_floor0_decode(vorbis_context *vc,
+                                vorbis_floor_data *vfu, float *vec);
+static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
+static int vorbis_floor1_decode(vorbis_context *vc,
+                                vorbis_floor_data *vfu, float *vec);
+static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    int i,j,k;
+
+    vc->floor_count = get_bits(gb, 6) + 1;
+
+    vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
+
+    for (i = 0; i < vc->floor_count; ++i) {
+        vorbis_floor *floor_setup = &vc->floors[i];
+
+        floor_setup->floor_type = get_bits(gb, 16);
+
+        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
+
+        if (floor_setup->floor_type == 1) {
+            int maximum_class = -1;
+            uint_fast8_t  rangebits;
+            uint_fast32_t rangemax;
+            uint_fast16_t floor1_values = 2;
+
+            floor_setup->decode = vorbis_floor1_decode;
+
+            floor_setup->data.t1.partitions = get_bits(gb, 5);
+
+            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
+
+            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
+                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
+                if (floor_setup->data.t1.partition_class[j] > maximum_class)
+                    maximum_class = floor_setup->data.t1.partition_class[j];
+
+                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
+
+            }
+
+            AV_DEBUG(" maximum class %d \n", maximum_class);
+
+            for (j = 0; j <= maximum_class; ++j) {
+                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
+                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
+
+                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
+
+                if (floor_setup->data.t1.class_subclasses[j]) {
+                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
+
+                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
+                }
+
+                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
+                    int16_t bits = get_bits(gb, 8) - 1;
+                    if (bits != -1)
+                        VALIDATE_INDEX(bits, vc->codebook_count)
+                    floor_setup->data.t1.subclass_books[j][k] = bits;
+
+                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
+                }
+            }
+
+            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
+            floor_setup->data.t1.x_list_dim = 2;
+
+            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
+                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
+
+            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
+
+
+            rangebits = get_bits(gb, 4);
+            rangemax = (1 << rangebits);
+            if (rangemax > vc->blocksize[1] / 2) {
+                av_log(vc->avccontext, AV_LOG_ERROR,
+                       "Floor value is too large for blocksize: %d (%d)\n",
+                       rangemax, vc->blocksize[1] / 2);
+                return -1;
+            }
+            floor_setup->data.t1.list[0].x = 0;
+            floor_setup->data.t1.list[1].x = rangemax;
+
+            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
+                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
+                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
+
+                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
+                }
+            }
+
+// Precalculate order of x coordinates - needed for decode
+            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
+        } else if (floor_setup->floor_type == 0) {
+            uint_fast8_t max_codebook_dim = 0;
+
+            floor_setup->decode = vorbis_floor0_decode;
+
+            floor_setup->data.t0.order          = get_bits(gb,  8);
+            floor_setup->data.t0.rate           = get_bits(gb, 16);
+            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
+            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
+            /* zero would result in a div by zero later *
+             * 2^0 - 1 == 0                             */
+            if (floor_setup->data.t0.amplitude_bits == 0) {
+                av_log(vc->avccontext, AV_LOG_ERROR,
+                       "Floor 0 amplitude bits is 0.\n");
+                return -1;
+            }
+            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
+            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
+
+            /* allocate mem for booklist */
+            floor_setup->data.t0.book_list =
+                av_malloc(floor_setup->data.t0.num_books);
+            if (!floor_setup->data.t0.book_list)
+                return -1;
+            /* read book indexes */
+            {
+                int idx;
+                uint_fast8_t book_idx;
+                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
+                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
+                    floor_setup->data.t0.book_list[idx] = book_idx;
+                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
+                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
+                }
+            }
+
+            create_map(vc, i);
+
+            /* codebook dim is for padding if codebook dim doesn't *
+             * divide order+1 then we need to read more data       */
+            floor_setup->data.t0.lsp =
+                av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
+                          * sizeof(float));
+            if (!floor_setup->data.t0.lsp)
+                return -1;
+
+#ifdef V_DEBUG /* debug output parsed headers */
+            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
+            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
+            AV_DEBUG("floor0 bark map size: %u\n",
+                     floor_setup->data.t0.bark_map_size);
+            AV_DEBUG("floor0 amplitude bits: %u\n",
+                     floor_setup->data.t0.amplitude_bits);
+            AV_DEBUG("floor0 amplitude offset: %u\n",
+                     floor_setup->data.t0.amplitude_offset);
+            AV_DEBUG("floor0 number of books: %u\n",
+                     floor_setup->data.t0.num_books);
+            AV_DEBUG("floor0 book list pointer: %p\n",
+                     floor_setup->data.t0.book_list);
+            {
+                int idx;
+                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
+                    AV_DEBUG("  Book %d: %u\n",
+                             idx+1,
+                             floor_setup->data.t0.book_list[idx]);
+                }
+            }
+#endif
+        } else {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
+            return -1;
+        }
+    }
+    return 0;
+}
+
+// Process residues part
+
+static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t i, j, k;
+
+    vc->residue_count = get_bits(gb, 6)+1;
+    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
+
+    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
+
+    for (i = 0; i < vc->residue_count; ++i) {
+        vorbis_residue *res_setup = &vc->residues[i];
+        uint_fast8_t cascade[64];
+        uint_fast8_t high_bits;
+        uint_fast8_t low_bits;
+
+        res_setup->type = get_bits(gb, 16);
+
+        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
+
+        res_setup->begin          = get_bits(gb, 24);
+        res_setup->end            = get_bits(gb, 24);
+        res_setup->partition_size = get_bits(gb, 24) + 1;
+        /* Validations to prevent a buffer overflow later. */
+        if (res_setup->begin>res_setup->end ||
+            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
+            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %u, %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
+            return -1;
+        }
+
+        res_setup->classifications = get_bits(gb, 6) + 1;
+        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
+
+        res_setup->ptns_to_read =
+            (res_setup->end - res_setup->begin) / res_setup->partition_size;
+        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
+                                        vc->audio_channels *
+                                        sizeof(*res_setup->classifs));
+        if (!res_setup->classifs)
+            return AVERROR(ENOMEM);
+
+        AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
+          res_setup->classifications, res_setup->classbook);
+
+        for (j = 0; j < res_setup->classifications; ++j) {
+            high_bits = 0;
+            low_bits  = get_bits(gb, 3);
+            if (get_bits1(gb))
+                high_bits = get_bits(gb, 5);
+            cascade[j] = (high_bits << 3) + low_bits;
+
+            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
+        }
+
+        res_setup->maxpass = 0;
+        for (j = 0; j < res_setup->classifications; ++j) {
+            for (k = 0; k < 8; ++k) {
+                if (cascade[j]&(1 << k)) {
+                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
+
+                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
+
+                    if (k>res_setup->maxpass)
+                        res_setup->maxpass = k;
+                } else {
+                    res_setup->books[j][k] = -1;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+// Process mappings part
+
+static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t i, j;
+
+    vc->mapping_count = get_bits(gb, 6)+1;
+    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
+
+    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
+
+    for (i = 0; i < vc->mapping_count; ++i) {
+        vorbis_mapping *mapping_setup = &vc->mappings[i];
+
+        if (get_bits(gb, 16)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
+            return -1;
+        }
+        if (get_bits1(gb)) {
+            mapping_setup->submaps = get_bits(gb, 4) + 1;
+        } else {
+            mapping_setup->submaps = 1;
+        }
+
+        if (get_bits1(gb)) {
+            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
+            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
+            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
+            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
+                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
+                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
+            }
+        } else {
+            mapping_setup->coupling_steps = 0;
+        }
+
+        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
+
+        if (get_bits(gb, 2)) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
+            return -1; // following spec.
+        }
+
+        if (mapping_setup->submaps>1) {
+            mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
+            for (j = 0; j < vc->audio_channels; ++j)
+                mapping_setup->mux[j] = get_bits(gb, 4);
+        }
+
+        for (j = 0; j < mapping_setup->submaps; ++j) {
+            skip_bits(gb, 8); // FIXME check?
+            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
+            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
+
+            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
+        }
+    }
+    return 0;
+}
+
+// Process modes part
+
+static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
+{
+    vorbis_floor *floors = vc->floors;
+    vorbis_floor0 *vf;
+    int idx;
+    int_fast8_t blockflag;
+    int_fast32_t *map;
+    int_fast32_t n; //TODO: could theoretically be smaller?
+
+    for (blockflag = 0; blockflag < 2; ++blockflag) {
+        n = vc->blocksize[blockflag] / 2;
+        floors[floor_number].data.t0.map[blockflag] =
+            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
+
+        map =  floors[floor_number].data.t0.map[blockflag];
+        vf  = &floors[floor_number].data.t0;
+
+        for (idx = 0; idx < n; ++idx) {
+            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
+                             ((vf->bark_map_size) /
+                              BARK(vf->rate / 2.0f)));
+            if (vf->bark_map_size-1 < map[idx])
+                map[idx] = vf->bark_map_size - 1;
+        }
+        map[n] = -1;
+        vf->map_size[blockflag] = n;
+    }
+
+#ifdef V_DEBUG
+    for (idx = 0; idx <= n; ++idx) {
+        AV_DEBUG("floor0 map: map at pos %d is %d\n",
+                 idx, map[idx]);
+    }
+#endif
+}
+
+static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t i;
+
+    vc->mode_count = get_bits(gb, 6) + 1;
+    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
+
+    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
+
+    for (i = 0; i < vc->mode_count; ++i) {
+        vorbis_mode *mode_setup = &vc->modes[i];
+
+        mode_setup->blockflag     = get_bits1(gb);
+        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
+        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
+        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
+
+        AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
+    }
+    return 0;
+}
+
+// Process the whole setup header using the functions above
+
+static int vorbis_parse_setup_hdr(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+
+    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
+        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
+        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
+        return -1;
+    }
+
+    if (vorbis_parse_setup_hdr_codebooks(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
+        return -2;
+    }
+    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
+        return -3;
+    }
+    if (vorbis_parse_setup_hdr_floors(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
+        return -4;
+    }
+    if (vorbis_parse_setup_hdr_residues(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
+        return -5;
+    }
+    if (vorbis_parse_setup_hdr_mappings(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
+        return -6;
+    }
+    if (vorbis_parse_setup_hdr_modes(vc)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
+        return -7;
+    }
+    if (!get_bits1(gb)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
+        return -8; // framing flag bit unset error
+    }
+
+    return 0;
+}
+
+// Process the identification header
+
+static int vorbis_parse_id_hdr(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t bl0, bl1;
+
+    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
+        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
+        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
+        return -1;
+    }
+
+    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
+    vc->audio_channels = get_bits(gb, 8);
+    if (vc->audio_channels <= 0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
+        return -1;
+    }
+    vc->audio_samplerate = get_bits_long(gb, 32);
+    if (vc->audio_samplerate <= 0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
+        return -1;
+    }
+    vc->bitrate_maximum = get_bits_long(gb, 32);
+    vc->bitrate_nominal = get_bits_long(gb, 32);
+    vc->bitrate_minimum = get_bits_long(gb, 32);
+    bl0 = get_bits(gb, 4);
+    bl1 = get_bits(gb, 4);
+    vc->blocksize[0] = (1 << bl0);
+    vc->blocksize[1] = (1 << bl1);
+    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
+        return -3;
+    }
+    // output format int16
+    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
+               "output packets too large.\n");
+        return -4;
+    }
+    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
+    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
+
+    if ((get_bits1(gb)) == 0) {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
+        return -2;
+    }
+
+    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
+    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
+    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
+    vc->previous_window  = 0;
+
+    ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
+    ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
+
+    AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
+            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
+
+/*
+    BLK = vc->blocksize[0];
+    for (i = 0; i < BLK / 2; ++i) {
+        vc->win[0][i] = sin(0.5*3.14159265358*(sin(((float)i + 0.5) / (float)BLK*3.14159265358))*(sin(((float)i + 0.5) / (float)BLK*3.14159265358)));
+    }
+*/
+
+    return 0;
+}
+
+// Process the extradata using the functions above (identification header, setup header)
+
+static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
+{
+    vorbis_context *vc = avccontext->priv_data ;
+    uint8_t *headers   = avccontext->extradata;
+    int headers_len    = avccontext->extradata_size;
+    uint8_t *header_start[3];
+    int header_len[3];
+    GetBitContext *gb = &(vc->gb);
+    int hdr_type;
+
+    vc->avccontext = avccontext;
+    dsputil_init(&vc->dsp, avccontext);
+    ff_fmt_convert_init(&vc->fmt_conv, avccontext);
+
+    vc->scale_bias = 32768.0f;
+
+    if (!headers_len) {
+        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
+        return -1;
+    }
+
+    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
+        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
+        return -1;
+    }
+
+    init_get_bits(gb, header_start[0], header_len[0]*8);
+    hdr_type = get_bits(gb, 8);
+    if (hdr_type != 1) {
+        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
+        return -1;
+    }
+    if (vorbis_parse_id_hdr(vc)) {
+        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
+        vorbis_free(vc);
+        return -1;
+    }
+
+    init_get_bits(gb, header_start[2], header_len[2]*8);
+    hdr_type = get_bits(gb, 8);
+    if (hdr_type != 5) {
+        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
+        vorbis_free(vc);
+        return -1;
+    }
+    if (vorbis_parse_setup_hdr(vc)) {
+        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
+        vorbis_free(vc);
+        return -1;
+    }
+
+    if (vc->audio_channels > 8)
+        avccontext->channel_layout = 0;
+    else
+        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
+
+    avccontext->channels    = vc->audio_channels;
+    avccontext->sample_rate = vc->audio_samplerate;
+    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
+    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;
+
+    return 0 ;
+}
+
+// Decode audiopackets -------------------------------------------------
+
+// Read and decode floor
+
+static int vorbis_floor0_decode(vorbis_context *vc,
+                                vorbis_floor_data *vfu, float *vec)
+{
+    vorbis_floor0 *vf = &vfu->t0;
+    float *lsp = vf->lsp;
+    uint_fast32_t amplitude;
+    uint_fast32_t book_idx;
+    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
+
+    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
+    if (amplitude > 0) {
+        float last = 0;
+        uint_fast16_t lsp_len = 0;
+        uint_fast16_t idx;
+        vorbis_codebook codebook;
+
+        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
+        if (book_idx >= vf->num_books) {
+            av_log(vc->avccontext, AV_LOG_ERROR,
+                    "floor0 dec: booknumber too high!\n");
+            book_idx =  0;
+        }
+        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
+        codebook = vc->codebooks[vf->book_list[book_idx]];
+        /* Invalid codebook! */
+        if (!codebook.codevectors)
+            return -1;
+
+        while (lsp_len<vf->order) {
+            int vec_off;
+
+            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
+            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
+            /* read temp vector */
+            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
+                               codebook.nb_bits, codebook.maxdepth)
+                      * codebook.dimensions;
+            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
+            /* copy each vector component and add last to it */
+            for (idx = 0; idx < codebook.dimensions; ++idx)
+                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
+            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
+
+            lsp_len += codebook.dimensions;
+        }
+#ifdef V_DEBUG
+        /* DEBUG: output lsp coeffs */
+        {
+            int idx;
+            for (idx = 0; idx < lsp_len; ++idx)
+                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
+        }
+#endif
+
+        /* synthesize floor output vector */
+        {
+            int i;
+            int order = vf->order;
+            float wstep = M_PI / vf->bark_map_size;
+
+            for (i = 0; i < order; i++)
+                lsp[i] = 2.0f * cos(lsp[i]);
+
+            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
+                     vf->map_size, order, wstep);
+
+            i = 0;
+            while (i < vf->map_size[blockflag]) {
+                int j, iter_cond = vf->map[blockflag][i];
+                float p = 0.5f;
+                float q = 0.5f;
+                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
+
+                /* similar part for the q and p products */
+                for (j = 0; j + 1 < order; j += 2) {
+                    q *= lsp[j]     - two_cos_w;
+                    p *= lsp[j + 1] - two_cos_w;
+                }
+                if (j == order) { // even order
+                    p *= p * (2.0f - two_cos_w);
+                    q *= q * (2.0f + two_cos_w);
+                } else { // odd order
+                    q *= two_cos_w-lsp[j]; // one more time for q
+
+                    /* final step and square */
+                    p *= p * (4.f - two_cos_w * two_cos_w);
+                    q *= q;
+                }
+
+                /* calculate linear floor value */
+                q = exp((((amplitude*vf->amplitude_offset) /
+                          (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
+                         - vf->amplitude_offset) * .11512925f);
+
+                /* fill vector */
+                do {
+                    vec[i] = q; ++i;
+                } while (vf->map[blockflag][i] == iter_cond);
+            }
+        }
+    } else {
+        /* this channel is unused */
+        return 1;
+    }
+
+    AV_DEBUG(" Floor0 decoded\n");
+
+    return 0;
+}
+
+static int vorbis_floor1_decode(vorbis_context *vc,
+                                vorbis_floor_data *vfu, float *vec)
+{
+    vorbis_floor1 *vf = &vfu->t1;
+    GetBitContext *gb = &vc->gb;
+    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
+    uint_fast16_t range = range_v[vf->multiplier-1];
+    uint_fast16_t floor1_Y[258];
+    uint_fast16_t floor1_Y_final[258];
+    int floor1_flag[258];
+    uint_fast8_t class_;
+    uint_fast8_t cdim;
+    uint_fast8_t cbits;
+    uint_fast8_t csub;
+    uint_fast8_t cval;
+    int_fast16_t book;
+    uint_fast16_t offset;
+    uint_fast16_t i,j;
+    int_fast16_t adx, ady, dy, off, predicted;
+    int_fast32_t err;
+
+
+    if (!get_bits1(gb)) // silence
+        return 1;
+
+// Read values (or differences) for the floor's points
+
+    floor1_Y[0] = get_bits(gb, ilog(range - 1));
+    floor1_Y[1] = get_bits(gb, ilog(range - 1));
+
+    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
+
+    offset = 2;
+    for (i = 0; i < vf->partitions; ++i) {
+        class_ = vf->partition_class[i];
+        cdim   = vf->class_dimensions[class_];
+        cbits  = vf->class_subclasses[class_];
+        csub = (1 << cbits) - 1;
+        cval = 0;
+
+        AV_DEBUG("Cbits %d \n", cbits);
+
+        if (cbits) // this reads all subclasses for this partition's class
+            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
+                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
+
+        for (j = 0; j < cdim; ++j) {
+            book = vf->subclass_books[class_][cval & csub];
+
+            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
+
+            cval = cval >> cbits;
+            if (book > -1) {
+                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
+                vc->codebooks[book].nb_bits, 3);
+            } else {
+                floor1_Y[offset+j] = 0;
+            }
+
+            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
+        }
+        offset+=cdim;
+    }
+
+// Amplitude calculation from the differences
+
+    floor1_flag[0] = 1;
+    floor1_flag[1] = 1;
+    floor1_Y_final[0] = floor1_Y[0];
+    floor1_Y_final[1] = floor1_Y[1];
+
+    for (i = 2; i < vf->x_list_dim; ++i) {
+        uint_fast16_t val, highroom, lowroom, room;
+        uint_fast16_t high_neigh_offs;
+        uint_fast16_t low_neigh_offs;
+
+        low_neigh_offs  = vf->list[i].low;
+        high_neigh_offs = vf->list[i].high;
+        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
+        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
+        ady = FFABS(dy);
+        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
+        off = err / adx;
+        if (dy < 0) {
+            predicted = floor1_Y_final[low_neigh_offs] - off;
+        } else {
+            predicted = floor1_Y_final[low_neigh_offs] + off;
+        } // render_point end
+
+        val = floor1_Y[i];
+        highroom = range-predicted;
+        lowroom  = predicted;
+        if (highroom < lowroom) {
+            room = highroom * 2;
+        } else {
+            room = lowroom * 2;   // SPEC mispelling
+        }
+        if (val) {
+            floor1_flag[low_neigh_offs]  = 1;
+            floor1_flag[high_neigh_offs] = 1;
+            floor1_flag[i]               = 1;
+            if (val >= room) {
+                if (highroom > lowroom) {
+                    floor1_Y_final[i] = val - lowroom + predicted;
+                } else {
+                    floor1_Y_final[i] = predicted - val + highroom - 1;
+                }
+            } else {
+                if (val & 1) {
+                    floor1_Y_final[i] = predicted - (val + 1) / 2;
+                } else {
+                    floor1_Y_final[i] = predicted + val / 2;
+                }
+            }
+        } else {
+            floor1_flag[i]    = 0;
+            floor1_Y_final[i] = predicted;
+        }
+
+        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
+    }
+
+// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
+
+    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
+
+    AV_DEBUG(" Floor decoded\n");
+
+    return 0;
+}
+
+// Read and decode residue
+
+static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
+                                                           vorbis_residue *vr,
+                                                           uint_fast8_t ch,
+                                                           uint_fast8_t *do_not_decode,
+                                                           float *vec,
+                                                           uint_fast16_t vlen,
+                                                           int vr_type)
+{
+    GetBitContext *gb = &vc->gb;
+    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
+    uint_fast16_t ptns_to_read = vr->ptns_to_read;
+    uint8_t *classifs = vr->classifs;
+    uint_fast8_t pass;
+    uint_fast8_t ch_used;
+    uint_fast8_t i,j,l;
+    uint_fast16_t k;
+
+    if (vr_type == 2) {
+        for (j = 1; j < ch; ++j)
+            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
+        if (do_not_decode[0])
+            return 0;
+        ch_used = 1;
+    } else {
+        ch_used = ch;
+    }
+
+    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
+
+    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
+        uint_fast16_t voffset;
+        uint_fast16_t partition_count;
+        uint_fast16_t j_times_ptns_to_read;
+
+        voffset = vr->begin;
+        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
+            if (!pass) {
+                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
+                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
+                    if (!do_not_decode[j]) {
+                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
+                        vc->codebooks[vr->classbook].nb_bits, 3);
+
+                        AV_DEBUG("Classword: %d \n", temp);
+
+                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
+                        for (i = 0; i < c_p_c; ++i) {
+                            uint_fast32_t temp2;
+
+                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
+                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
+                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
+                            temp = temp2;
+                        }
+                    }
+                    j_times_ptns_to_read += ptns_to_read;
+                }
+            }
+            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
+                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
+                    uint_fast16_t voffs;
+
+                    if (!do_not_decode[j]) {
+                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
+                        int_fast16_t vqbook = vr->books[vqclass][pass];
+
+                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
+                            uint_fast16_t coffs;
+                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
+                            uint_fast16_t step = dim == 1 ? vr->partition_size
+                                                          : FASTDIV(vr->partition_size, dim);
+                            vorbis_codebook codebook = vc->codebooks[vqbook];
+
+                            if (vr_type == 0) {
+
+                                voffs = voffset+j*vlen;
+                                for (k = 0; k < step; ++k) {
+                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for (l = 0; l < dim; ++l)
+                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
+                                }
+                            } else if (vr_type == 1) {
+                                voffs = voffset + j * vlen;
+                                for (k = 0; k < step; ++k) {
+                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for (l = 0; l < dim; ++l, ++voffs) {
+                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
+                                    }
+                                }
+                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
+                                voffs = voffset >> 1;
+
+                                if (dim == 2) {
+                                    for (k = 0; k < step; ++k) {
+                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
+                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
+                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
+                                    }
+                                } else if (dim == 4) {
+                                    for (k = 0; k < step; ++k, voffs += 2) {
+                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
+                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
+                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
+                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
+                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
+                                    }
+                                } else
+                                for (k = 0; k < step; ++k) {
+                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for (l = 0; l < dim; l += 2, voffs++) {
+                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
+                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
+                                    }
+                                }
+
+                            } else if (vr_type == 2) {
+                                voffs = voffset;
+
+                                for (k = 0; k < step; ++k) {
+                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
+                                    for (l = 0; l < dim; ++l, ++voffs) {
+                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
+
+                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    j_times_ptns_to_read += ptns_to_read;
+                }
+                ++partition_count;
+                voffset += vr->partition_size;
+            }
+        }
+    }
+    return 0;
+}
+
+static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
+                                        uint_fast8_t ch,
+                                        uint_fast8_t *do_not_decode,
+                                        float *vec, uint_fast16_t vlen)
+{
+    if (vr->type == 2)
+        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
+    else if (vr->type == 1)
+        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
+    else if (vr->type == 0)
+        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
+    else {
+        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
+        return -1;
+    }
+}
+
+void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
+{
+    int i;
+    for (i = 0;  i < blocksize;  i++) {
+        if (mag[i] > 0.0) {
+            if (ang[i] > 0.0) {
+                ang[i] = mag[i] - ang[i];
+            } else {
+                float temp = ang[i];
+                ang[i]     = mag[i];
+                mag[i]    += temp;
+            }
+        } else {
+            if (ang[i] > 0.0) {
+                ang[i] += mag[i];
+            } else {
+                float temp = ang[i];
+                ang[i]     = mag[i];
+                mag[i]    -= temp;
+            }
+        }
+    }
+}
+
+// Decode the audio packet using the functions above
+
+static int vorbis_parse_audio_packet(vorbis_context *vc)
+{
+    GetBitContext *gb = &vc->gb;
+    FFTContext *mdct;
+    uint_fast8_t previous_window = vc->previous_window;
+    uint_fast8_t mode_number;
+    uint_fast8_t blockflag;
+    uint_fast16_t blocksize;
+    int_fast32_t i,j;
+    uint_fast8_t no_residue[255];
+    uint_fast8_t do_not_decode[255];
+    vorbis_mapping *mapping;
+    float *ch_res_ptr   = vc->channel_residues;
+    float *ch_floor_ptr = vc->channel_floors;
+    uint_fast8_t res_chan[255];
+    uint_fast8_t res_num = 0;
+    int_fast16_t retlen  = 0;
+
+    if (get_bits1(gb)) {
+        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
+        return -1; // packet type not audio
+    }
+
+    if (vc->mode_count == 1) {
+        mode_number = 0;
+    } else {
+        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
+    }
+    vc->mode_number = mode_number;
+    mapping = &vc->mappings[vc->modes[mode_number].mapping];
+
+    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
+
+    blockflag = vc->modes[mode_number].blockflag;
+    blocksize = vc->blocksize[blockflag];
+    if (blockflag)
+        skip_bits(gb, 2); // previous_window, next_window
+
+    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
+    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
+
+// Decode floor
+
+    for (i = 0; i < vc->audio_channels; ++i) {
+        vorbis_floor *floor;
+        int ret;
+        if (mapping->submaps > 1) {
+            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
+        } else {
+            floor = &vc->floors[mapping->submap_floor[0]];
+        }
+
+        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
+
+        if (ret < 0) {
+            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
+            return -1;
+        }
+        no_residue[i] = ret;
+        ch_floor_ptr += blocksize / 2;
+    }
+
+// Nonzero vector propagate
+
+    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
+        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
+            no_residue[mapping->magnitude[i]] = 0;
+            no_residue[mapping->angle[i]]     = 0;
+        }
+    }
+
+// Decode residue
+
+    for (i = 0; i < mapping->submaps; ++i) {
+        vorbis_residue *residue;
+        uint_fast8_t ch = 0;
+
+        for (j = 0; j < vc->audio_channels; ++j) {
+            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
+                res_chan[j] = res_num;
+                if (no_residue[j]) {
+                    do_not_decode[ch] = 1;
+                } else {
+                    do_not_decode[ch] = 0;
+                }
+                ++ch;
+                ++res_num;
+            }
+        }
+        residue = &vc->residues[mapping->submap_residue[i]];
+        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
+
+        ch_res_ptr += ch * blocksize / 2;
+    }
+
+// Inverse coupling
+
+    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
+        float *mag, *ang;
+
+        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
+        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
+        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
+    }
+
+// Dotproduct, MDCT
+
+    mdct = &vc->mdct[blockflag];
+
+    for (j = vc->audio_channels-1;j >= 0; j--) {
+        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
+        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
+        vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
+        mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
+    }
+
+// Overlap/add, save data for next overlapping  FPMATH
+
+    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
+    for (j = 0; j < vc->audio_channels; j++) {
+        uint_fast16_t bs0 = vc->blocksize[0];
+        uint_fast16_t bs1 = vc->blocksize[1];
+        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
+        float *saved      = vc->saved + j * bs1 / 4;
+        float *ret        = vc->channel_floors + j * retlen;
+        float *buf        = residue;
+        const float *win  = vc->win[blockflag & previous_window];
+
+        if (blockflag == previous_window) {
+            vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
+        } else if (blockflag > previous_window) {
+            vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
+            memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
+        } else {
+            memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
+            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
+        }
+        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
+    }
+
+    vc->previous_window = blockflag;
+    return retlen;
+}
+
+// Return the decoded audio packet through the standard api
+
+static int vorbis_decode_frame(AVCodecContext *avccontext,
+                               void *data, int *data_size,
+                               AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    vorbis_context *vc = avccontext->priv_data ;
+    GetBitContext *gb = &(vc->gb);
+    const float *channel_ptrs[255];
+    int i;
+
+    int_fast16_t len;
+
+    if (!buf_size)
+        return 0;
+
+    AV_DEBUG("packet length %d \n", buf_size);
+
+    init_get_bits(gb, buf, buf_size*8);
+
+    len = vorbis_parse_audio_packet(vc);
+
+    if (len <= 0) {
+        *data_size = 0;
+        return buf_size;
+    }
+
+    if (!vc->first_frame) {
+        vc->first_frame = 1;
+        *data_size = 0;
+        return buf_size ;
+    }
+
+    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
+
+    if (vc->audio_channels > 8) {
+        for (i = 0; i < vc->audio_channels; i++)
+            channel_ptrs[i] = vc->channel_floors + i * len;
+    } else {
+        for (i = 0; i < vc->audio_channels; i++)
+            channel_ptrs[i] = vc->channel_floors +
+                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
+    }
+
+    vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,
+                                           vc->audio_channels);
+    *data_size = len * 2 * vc->audio_channels;
+
+    return buf_size ;
+}
+
+// Close decoder
+
+static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
+{
+    vorbis_context *vc = avccontext->priv_data;
+
+    vorbis_free(vc);
+
+    return 0 ;
+}
+
+AVCodec ff_vorbis_decoder = {
+    "vorbis",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_VORBIS,
+    sizeof(vorbis_context),
+    vorbis_decode_init,
+    NULL,
+    vorbis_decode_close,
+    vorbis_decode_frame,
+    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
+    .channel_layouts = ff_vorbis_channel_layouts,
+};
+