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FFmpeg/libavcodec/vorbis_dec.c

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/**
* @file libavcodec/vorbis_dec.c
* 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 "vorbis.h"
#include "xiph.h"
#define V_NB_BITS 8
#define V_NB_BITS2 11
#define V_MAX_VLCS (1<<16)
#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
uint_fast8_t (* 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;
uint_fast8_t maximum_class;
uint_fast8_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;
uint_fast32_t partition_size;
uint_fast8_t classifications;
uint_fast8_t classbook;
int_fast16_t books[64][8];
uint_fast8_t maxpass;
} 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;
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;
uint_fast32_t add_bias; // for float->int conversion
uint_fast32_t exp_bias;
} 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 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);
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;
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));
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) {
av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%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);
uint_fast16_t codebook_multiplicands[codebook_lookup_values];
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);
return 0;
// Error:
error:
av_free(tmp_vlc_bits);
av_free(tmp_vlc_codes);
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 uint_fast8_t 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 uint_fast8_t 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;
uint_fast16_t 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) {
uint_fast8_t maximum_class=0;
uint_fast8_t rangebits;
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);
floor_setup->data.t1.maximum_class=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]) {
floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
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) {
floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
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);
floor_setup->data.t1.list[0].x = 0;
floor_setup->data.t1.list[1].x = (1<<rangebits);
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) {
book_idx=get_bits(gb, 8);
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;
if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
return 1;
}
}
create_map( vc, i );
/* allocate mem for lsp coefficients */
{
/* 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;
res_setup->classifications=get_bits(gb, 6)+1;
res_setup->classbook=get_bits(gb, 8);
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)) {
res_setup->books[j][k]=get_bits(gb, 8);
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) {
mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
// FIXME: sanity checks
}
} 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?
mapping_setup->submap_floor[j]=get_bits(gb, 8);
mapping_setup->submap_residue[j]=get_bits(gb, 8);
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
mode_setup->mapping=get_bits(gb, 8); //FIXME check
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); //FIXME check >0
vc->audio_samplerate=get_bits_long(gb, 32); //FIXME check >0
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->exp_bias ? -(1<<15) : -1.0);
ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1<<15) : -1.0);
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);
if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
vc->add_bias = 385;
vc->exp_bias = 0;
} else {
vc->add_bias = 0;
vc->exp_bias = 15<<23;
}
if (!headers_len) {
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\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;
}
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 = SAMPLE_FMT_S16;
return 0 ;
}
// Decode audiopackets -------------------------------------------------
// Read and decode floor
static uint_fast8_t 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;
//FIXME: look above
}
AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
codebook=vc->codebooks[vf->book_list[book_idx]];
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 uint_fast8_t 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[vf->x_list_dim];
uint_fast16_t floor1_Y_final[vf->x_list_dim];
int floor1_flag[vf->x_list_dim];
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;
/*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
int_fast16_t dy, err;
if (!get_bits1(gb)) return 1; // silence
// 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=(int16_t)err/(int16_t)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 n_to_read=vr->end-vr->begin;
uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
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;
}
}
}
}
static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
{
int i;
if(exp_bias) {
memcpy(dst, src, len * sizeof(float));
} else {
for(i=0; i<len; i++)
dst[i] = src[i] + add_bias;
}
}
// 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[vc->audio_channels];
uint_fast8_t do_not_decode[vc->audio_channels];
vorbis_mapping *mapping;
float *ch_res_ptr=vc->channel_residues;
float *ch_floor_ptr=vc->channel_floors;
uint_fast8_t res_chan[vc->audio_channels];
uint_fast8_t res_num=0;
int_fast16_t retlen=0;
float fadd_bias = vc->add_bias;
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 {
mode_number=get_bits(gb, ilog(vc->mode_count-1));
}
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;
if (mapping->submaps>1) {
floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
} else {
floor=&vc->floors[mapping->submap_floor[0]];
}
no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
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_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, fadd_bias, blocksize/4);
} else if(blockflag > previous_window) {
vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);
copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
} else {
copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, 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[vc->audio_channels];
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);
for(i=0; i<vc->audio_channels; i++)
channel_ptrs[i] = vc->channel_floors+i*len;
vc->dsp.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 vorbis_decoder = {
"vorbis",
CODEC_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"),
};