1667 lines
60 KiB
C
1667 lines
60 KiB
C
/**
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* @file
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* Vorbis I decoder
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* @author Denes Balatoni ( dbalatoni programozo hu )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#undef V_DEBUG
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//#define V_DEBUG
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//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
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#include <math.h>
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#define ALT_BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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#include "fft.h"
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#include "fmtconvert.h"
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#include "vorbis.h"
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#include "xiph.h"
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#define V_NB_BITS 8
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#define V_NB_BITS2 11
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#define V_MAX_VLCS (1 << 16)
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#define V_MAX_PARTITIONS (1 << 20)
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#ifndef V_DEBUG
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#define AV_DEBUG(...)
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#endif
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#undef NDEBUG
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#include <assert.h>
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typedef struct {
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uint_fast8_t dimensions;
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uint_fast8_t lookup_type;
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uint_fast8_t maxdepth;
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VLC vlc;
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float *codevectors;
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unsigned int nb_bits;
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} vorbis_codebook;
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typedef union vorbis_floor_u vorbis_floor_data;
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typedef struct vorbis_floor0_s vorbis_floor0;
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typedef struct vorbis_floor1_s vorbis_floor1;
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struct vorbis_context_s;
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typedef
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int (* vorbis_floor_decode_func)
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(struct vorbis_context_s *, vorbis_floor_data *, float *);
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typedef struct {
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uint_fast8_t floor_type;
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vorbis_floor_decode_func decode;
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union vorbis_floor_u {
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struct vorbis_floor0_s {
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uint_fast8_t order;
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uint_fast16_t rate;
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uint_fast16_t bark_map_size;
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int_fast32_t *map[2];
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uint_fast32_t map_size[2];
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uint_fast8_t amplitude_bits;
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uint_fast8_t amplitude_offset;
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uint_fast8_t num_books;
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uint_fast8_t *book_list;
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float *lsp;
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} t0;
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struct vorbis_floor1_s {
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uint_fast8_t partitions;
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uint8_t partition_class[32];
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uint_fast8_t class_dimensions[16];
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uint_fast8_t class_subclasses[16];
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uint_fast8_t class_masterbook[16];
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int_fast16_t subclass_books[16][8];
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uint_fast8_t multiplier;
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uint_fast16_t x_list_dim;
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vorbis_floor1_entry *list;
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} t1;
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} data;
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} vorbis_floor;
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typedef struct {
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uint_fast16_t type;
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uint_fast32_t begin;
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uint_fast32_t end;
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unsigned partition_size;
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uint_fast8_t classifications;
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uint_fast8_t classbook;
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int_fast16_t books[64][8];
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uint_fast8_t maxpass;
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uint_fast16_t ptns_to_read;
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uint8_t *classifs;
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} vorbis_residue;
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typedef struct {
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uint_fast8_t submaps;
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uint_fast16_t coupling_steps;
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uint_fast8_t *magnitude;
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uint_fast8_t *angle;
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uint_fast8_t *mux;
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uint_fast8_t submap_floor[16];
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uint_fast8_t submap_residue[16];
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} vorbis_mapping;
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typedef struct {
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uint_fast8_t blockflag;
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uint_fast16_t windowtype;
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uint_fast16_t transformtype;
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uint_fast8_t mapping;
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} vorbis_mode;
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typedef struct vorbis_context_s {
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AVCodecContext *avccontext;
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GetBitContext gb;
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DSPContext dsp;
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FmtConvertContext fmt_conv;
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FFTContext mdct[2];
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uint_fast8_t first_frame;
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uint_fast32_t version;
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uint_fast8_t audio_channels;
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uint_fast32_t audio_samplerate;
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uint_fast32_t bitrate_maximum;
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uint_fast32_t bitrate_nominal;
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uint_fast32_t bitrate_minimum;
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uint_fast32_t blocksize[2];
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const float *win[2];
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uint_fast16_t codebook_count;
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vorbis_codebook *codebooks;
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uint_fast8_t floor_count;
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vorbis_floor *floors;
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uint_fast8_t residue_count;
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vorbis_residue *residues;
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uint_fast8_t mapping_count;
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vorbis_mapping *mappings;
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uint_fast8_t mode_count;
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vorbis_mode *modes;
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uint_fast8_t mode_number; // mode number for the current packet
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uint_fast8_t previous_window;
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float *channel_residues;
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float *channel_floors;
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float *saved;
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float scale_bias; // for float->int conversion
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} vorbis_context;
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/* Helper functions */
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#define BARK(x) \
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(13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
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static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
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#define VALIDATE_INDEX(idx, limit) \
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if (idx >= limit) {\
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av_log(vc->avccontext, AV_LOG_ERROR,\
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idx_err_str,\
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(int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
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return -1;\
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}
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#define GET_VALIDATED_INDEX(idx, bits, limit) \
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{\
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idx = get_bits(gb, bits);\
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VALIDATE_INDEX(idx, limit)\
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}
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static float vorbisfloat2float(uint_fast32_t val)
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{
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double mant = val & 0x1fffff;
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long exp = (val & 0x7fe00000L) >> 21;
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if (val & 0x80000000)
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mant = -mant;
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return ldexp(mant, exp - 20 - 768);
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}
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// Free all allocated memory -----------------------------------------
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static void vorbis_free(vorbis_context *vc)
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{
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int_fast16_t i;
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av_freep(&vc->channel_residues);
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av_freep(&vc->channel_floors);
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av_freep(&vc->saved);
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for (i = 0; i < vc->residue_count; i++)
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av_free(vc->residues[i].classifs);
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av_freep(&vc->residues);
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av_freep(&vc->modes);
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ff_mdct_end(&vc->mdct[0]);
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ff_mdct_end(&vc->mdct[1]);
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for (i = 0; i < vc->codebook_count; ++i) {
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av_free(vc->codebooks[i].codevectors);
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free_vlc(&vc->codebooks[i].vlc);
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}
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av_freep(&vc->codebooks);
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for (i = 0; i < vc->floor_count; ++i) {
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if (vc->floors[i].floor_type == 0) {
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av_free(vc->floors[i].data.t0.map[0]);
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av_free(vc->floors[i].data.t0.map[1]);
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av_free(vc->floors[i].data.t0.book_list);
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av_free(vc->floors[i].data.t0.lsp);
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} else {
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av_free(vc->floors[i].data.t1.list);
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}
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}
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av_freep(&vc->floors);
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for (i = 0; i < vc->mapping_count; ++i) {
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av_free(vc->mappings[i].magnitude);
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av_free(vc->mappings[i].angle);
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av_free(vc->mappings[i].mux);
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}
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av_freep(&vc->mappings);
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}
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// Parse setup header -------------------------------------------------
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// Process codebooks part
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static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
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{
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uint_fast16_t cb;
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uint8_t *tmp_vlc_bits;
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uint32_t *tmp_vlc_codes;
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GetBitContext *gb = &vc->gb;
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uint_fast16_t *codebook_multiplicands;
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vc->codebook_count = get_bits(gb, 8) + 1;
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AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
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vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
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tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
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tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
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codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
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for (cb = 0; cb < vc->codebook_count; ++cb) {
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vorbis_codebook *codebook_setup = &vc->codebooks[cb];
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uint_fast8_t ordered;
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uint_fast32_t t, used_entries = 0;
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uint_fast32_t entries;
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AV_DEBUG(" %d. Codebook \n", cb);
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if (get_bits(gb, 24) != 0x564342) {
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
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goto error;
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}
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codebook_setup->dimensions=get_bits(gb, 16);
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if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
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goto error;
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}
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entries = get_bits(gb, 24);
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if (entries > V_MAX_VLCS) {
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
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goto error;
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}
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ordered = get_bits1(gb);
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AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
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if (!ordered) {
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uint_fast16_t ce;
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uint_fast8_t flag;
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uint_fast8_t sparse = get_bits1(gb);
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AV_DEBUG(" not ordered \n");
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if (sparse) {
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AV_DEBUG(" sparse \n");
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used_entries = 0;
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for (ce = 0; ce < entries; ++ce) {
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flag = get_bits1(gb);
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if (flag) {
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tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
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++used_entries;
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} else
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tmp_vlc_bits[ce] = 0;
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}
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} else {
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AV_DEBUG(" not sparse \n");
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used_entries = entries;
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for (ce = 0; ce < entries; ++ce)
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tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
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}
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} else {
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uint_fast16_t current_entry = 0;
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uint_fast8_t current_length = get_bits(gb, 5)+1;
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AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
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used_entries = entries;
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for (; current_entry < used_entries && current_length <= 32; ++current_length) {
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uint_fast16_t i, number;
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AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
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number = get_bits(gb, ilog(entries - current_entry));
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AV_DEBUG(" number: %d \n", number);
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for (i = current_entry; i < number+current_entry; ++i)
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if (i < used_entries)
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tmp_vlc_bits[i] = current_length;
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current_entry+=number;
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}
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if (current_entry>used_entries) {
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av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
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goto error;
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}
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}
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codebook_setup->lookup_type = get_bits(gb, 4);
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AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
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// If the codebook is used for (inverse) VQ, calculate codevectors.
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if (codebook_setup->lookup_type == 1) {
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uint_fast16_t i, j, k;
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uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
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float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
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float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
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uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
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uint_fast8_t codebook_sequence_p = get_bits1(gb);
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AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
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AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
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for (i = 0; i < codebook_lookup_values; ++i) {
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codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
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AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
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AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
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}
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// Weed out unused vlcs and build codevector vector
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codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
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for (j = 0, i = 0; i < entries; ++i) {
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uint_fast8_t dim = codebook_setup->dimensions;
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if (tmp_vlc_bits[i]) {
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float last = 0.0;
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uint_fast32_t lookup_offset = i;
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
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#endif
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for (k = 0; k < dim; ++k) {
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uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
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codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
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if (codebook_sequence_p)
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last = codebook_setup->codevectors[j * dim + k];
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lookup_offset/=codebook_lookup_values;
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}
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tmp_vlc_bits[j] = tmp_vlc_bits[i];
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
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for (k = 0; k < dim; ++k)
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av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
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av_log(vc->avccontext, AV_LOG_INFO, "\n");
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#endif
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++j;
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}
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}
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if (j != used_entries) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
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goto error;
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}
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entries = used_entries;
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} else if (codebook_setup->lookup_type >= 2) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
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goto error;
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}
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// Initialize VLC table
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if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
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av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
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goto error;
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}
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codebook_setup->maxdepth = 0;
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for (t = 0; t < entries; ++t)
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if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
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codebook_setup->maxdepth = tmp_vlc_bits[t];
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if (codebook_setup->maxdepth > 3 * V_NB_BITS)
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codebook_setup->nb_bits = V_NB_BITS2;
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else
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codebook_setup->nb_bits = V_NB_BITS;
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codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
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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)) {
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av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
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goto error;
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}
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}
|
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av_free(tmp_vlc_bits);
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av_free(tmp_vlc_codes);
|
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av_free(codebook_multiplicands);
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return 0;
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|
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// Error:
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error:
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av_free(tmp_vlc_bits);
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av_free(tmp_vlc_codes);
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av_free(codebook_multiplicands);
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return -1;
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}
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// Process time domain transforms part (unused in Vorbis I)
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static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
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{
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GetBitContext *gb = &vc->gb;
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uint_fast8_t i;
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uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
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for (i = 0; i < vorbis_time_count; ++i) {
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uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
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AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
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if (vorbis_tdtransform) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
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return -1;
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}
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}
|
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return 0;
|
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}
|
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|
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// Process floors part
|
|
|
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static int vorbis_floor0_decode(vorbis_context *vc,
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vorbis_floor_data *vfu, float *vec);
|
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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;
|
|
|
|
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
|
|
|
|
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);
|
|
ff_imdct_half(&vc->mdct[blockflag], 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,
|
|
};
|
|
|