PeerStreamer

/**

 * @file

 * Vorbis I decoder

 * @author Denes Balatoni  ( dbalatoni programozo hu )

 *

 * 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

 */

#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;

    /* ffdshow custom code */

#if CONFIG_AUDIO_FLOAT

    avccontext->sample_fmt  = AV_SAMPLE_FMT_FLT;

#else

    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;

#endif

    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?