forked from FFmpeg/FFmpeg
/
vorbisdec.c
1680 lines (1397 loc) · 61.6 KB
/
vorbisdec.c
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/**
* @file
* Vorbis I decoder
* @author Denes Balatoni ( dbalatoni programozo hu )
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include <math.h>
#define ALT_BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "fft.h"
#include "fmtconvert.h"
#include "vorbis.h"
#include "xiph.h"
#define V_NB_BITS 8
#define V_NB_BITS2 11
#define V_MAX_VLCS (1 << 16)
#define V_MAX_PARTITIONS (1 << 20)
#undef NDEBUG
#include <assert.h>
typedef struct {
uint8_t dimensions;
uint8_t lookup_type;
uint8_t maxdepth;
VLC vlc;
float *codevectors;
unsigned int nb_bits;
} vorbis_codebook;
typedef union vorbis_floor_u vorbis_floor_data;
typedef struct vorbis_floor0_s vorbis_floor0;
typedef struct vorbis_floor1_s vorbis_floor1;
struct vorbis_context_s;
typedef
int (* vorbis_floor_decode_func)
(struct vorbis_context_s *, vorbis_floor_data *, float *);
typedef struct {
uint8_t floor_type;
vorbis_floor_decode_func decode;
union vorbis_floor_u {
struct vorbis_floor0_s {
uint8_t order;
uint16_t rate;
uint16_t bark_map_size;
int32_t *map[2];
uint32_t map_size[2];
uint8_t amplitude_bits;
uint8_t amplitude_offset;
uint8_t num_books;
uint8_t *book_list;
float *lsp;
} t0;
struct vorbis_floor1_s {
uint8_t partitions;
uint8_t partition_class[32];
uint8_t class_dimensions[16];
uint8_t class_subclasses[16];
uint8_t class_masterbook[16];
int16_t subclass_books[16][8];
uint8_t multiplier;
uint16_t x_list_dim;
vorbis_floor1_entry *list;
} t1;
} data;
} vorbis_floor;
typedef struct {
uint16_t type;
uint32_t begin;
uint32_t end;
unsigned partition_size;
uint8_t classifications;
uint8_t classbook;
int16_t books[64][8];
uint8_t maxpass;
uint16_t ptns_to_read;
uint8_t *classifs;
} vorbis_residue;
typedef struct {
uint8_t submaps;
uint16_t coupling_steps;
uint8_t *magnitude;
uint8_t *angle;
uint8_t *mux;
uint8_t submap_floor[16];
uint8_t submap_residue[16];
} vorbis_mapping;
typedef struct {
uint8_t blockflag;
uint16_t windowtype;
uint16_t transformtype;
uint8_t mapping;
} vorbis_mode;
typedef struct vorbis_context_s {
AVCodecContext *avccontext;
GetBitContext gb;
DSPContext dsp;
FmtConvertContext fmt_conv;
FFTContext mdct[2];
uint8_t first_frame;
uint32_t version;
uint8_t audio_channels;
uint32_t audio_samplerate;
uint32_t bitrate_maximum;
uint32_t bitrate_nominal;
uint32_t bitrate_minimum;
uint32_t blocksize[2];
const float *win[2];
uint16_t codebook_count;
vorbis_codebook *codebooks;
uint8_t floor_count;
vorbis_floor *floors;
uint8_t residue_count;
vorbis_residue *residues;
uint8_t mapping_count;
vorbis_mapping *mappings;
uint8_t mode_count;
vorbis_mode *modes;
uint8_t mode_number; // mode number for the current packet
uint8_t previous_window;
float *channel_residues;
float *channel_floors;
float *saved;
float scale_bias; // for float->int conversion
} vorbis_context;
/* Helper functions */
#define BARK(x) \
(13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
#define VALIDATE_INDEX(idx, limit) \
if (idx >= limit) {\
av_log(vc->avccontext, AV_LOG_ERROR,\
idx_err_str,\
(int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
return -1;\
}
#define GET_VALIDATED_INDEX(idx, bits, limit) \
{\
idx = get_bits(gb, bits);\
VALIDATE_INDEX(idx, limit)\
}
static float vorbisfloat2float(unsigned 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 i;
av_freep(&vc->channel_residues);
av_freep(&vc->channel_floors);
av_freep(&vc->saved);
for (i = 0; i < vc->residue_count; i++)
av_free(vc->residues[i].classifs);
av_freep(&vc->residues);
av_freep(&vc->modes);
ff_mdct_end(&vc->mdct[0]);
ff_mdct_end(&vc->mdct[1]);
for (i = 0; i < vc->codebook_count; ++i) {
av_free(vc->codebooks[i].codevectors);
free_vlc(&vc->codebooks[i].vlc);
}
av_freep(&vc->codebooks);
for (i = 0; i < vc->floor_count; ++i) {
if (vc->floors[i].floor_type == 0) {
av_free(vc->floors[i].data.t0.map[0]);
av_free(vc->floors[i].data.t0.map[1]);
av_free(vc->floors[i].data.t0.book_list);
av_free(vc->floors[i].data.t0.lsp);
} else {
av_free(vc->floors[i].data.t1.list);
}
}
av_freep(&vc->floors);
for (i = 0; i < vc->mapping_count; ++i) {
av_free(vc->mappings[i].magnitude);
av_free(vc->mappings[i].angle);
av_free(vc->mappings[i].mux);
}
av_freep(&vc->mappings);
}
// Parse setup header -------------------------------------------------
// Process codebooks part
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
{
unsigned cb;
uint8_t *tmp_vlc_bits;
uint32_t *tmp_vlc_codes;
GetBitContext *gb = &vc->gb;
uint16_t *codebook_multiplicands;
vc->codebook_count = get_bits(gb, 8) + 1;
av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
for (cb = 0; cb < vc->codebook_count; ++cb) {
vorbis_codebook *codebook_setup = &vc->codebooks[cb];
unsigned ordered, t, entries, used_entries = 0;
av_dlog(NULL, " %u. Codebook\n", cb);
if (get_bits(gb, 24) != 0x564342) {
av_log(vc->avccontext, AV_LOG_ERROR,
" %u. Codebook setup data corrupt.\n", cb);
goto error;
}
codebook_setup->dimensions=get_bits(gb, 16);
if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
av_log(vc->avccontext, AV_LOG_ERROR,
" %u. Codebook's dimension is invalid (%d).\n",
cb, codebook_setup->dimensions);
goto error;
}
entries = get_bits(gb, 24);
if (entries > V_MAX_VLCS) {
av_log(vc->avccontext, AV_LOG_ERROR,
" %u. Codebook has too many entries (%u).\n",
cb, entries);
goto error;
}
ordered = get_bits1(gb);
av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
codebook_setup->dimensions, entries);
if (!ordered) {
unsigned ce, flag;
unsigned sparse = get_bits1(gb);
av_dlog(NULL, " not ordered \n");
if (sparse) {
av_dlog(NULL, " 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_dlog(NULL, " not sparse \n");
used_entries = entries;
for (ce = 0; ce < entries; ++ce)
tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
}
} else {
unsigned current_entry = 0;
unsigned current_length = get_bits(gb, 5) + 1;
av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
used_entries = entries;
for (; current_entry < used_entries && current_length <= 32; ++current_length) {
unsigned i, number;
av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
number = get_bits(gb, ilog(entries - current_entry));
av_dlog(NULL, " number: %u\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_dlog(NULL, " 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) {
unsigned i, j, k;
unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
unsigned codebook_value_bits = get_bits(gb, 4) + 1;
unsigned codebook_sequence_p = get_bits1(gb);
av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
codebook_lookup_values);
av_dlog(NULL, " 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_dlog(NULL, " multiplicands*delta+minmum : %e \n",
(float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
av_dlog(NULL, " multiplicand %u\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(*codebook_setup->codevectors))
: NULL;
for (j = 0, i = 0; i < entries; ++i) {
unsigned dim = codebook_setup->dimensions;
if (tmp_vlc_bits[i]) {
float last = 0.0;
unsigned lookup_offset = i;
av_dlog(vc->avccontext, "Lookup offset %u ,", i);
for (k = 0; k < dim; ++k) {
unsigned 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];
av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);
for (k = 0; k < dim; ++k)
av_dlog(vc->avccontext, " %f ",
codebook_setup->codevectors[j * dim + k]);
av_dlog(vc->avccontext, "\n");
++j;
}
}
if (j != used_entries) {
av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
goto error;
}
entries = used_entries;
} else if (codebook_setup->lookup_type >= 2) {
av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
goto error;
}
// Initialize VLC table
if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
goto error;
}
codebook_setup->maxdepth = 0;
for (t = 0; t < entries; ++t)
if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
codebook_setup->maxdepth = tmp_vlc_bits[t];
if (codebook_setup->maxdepth > 3 * V_NB_BITS)
codebook_setup->nb_bits = V_NB_BITS2;
else
codebook_setup->nb_bits = V_NB_BITS;
codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
goto error;
}
}
av_free(tmp_vlc_bits);
av_free(tmp_vlc_codes);
av_free(codebook_multiplicands);
return 0;
// Error:
error:
av_free(tmp_vlc_bits);
av_free(tmp_vlc_codes);
av_free(codebook_multiplicands);
return -1;
}
// Process time domain transforms part (unused in Vorbis I)
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
{
GetBitContext *gb = &vc->gb;
unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
for (i = 0; i < vorbis_time_count; ++i) {
unsigned vorbis_tdtransform = get_bits(gb, 16);
av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
vorbis_time_count, vorbis_tdtransform);
if (vorbis_tdtransform) {
av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
return -1;
}
}
return 0;
}
// Process floors part
static int vorbis_floor0_decode(vorbis_context *vc,
vorbis_floor_data *vfu, float *vec);
static void create_map(vorbis_context *vc, unsigned 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(*vc->floors));
for (i = 0; i < vc->floor_count; ++i) {
vorbis_floor *floor_setup = &vc->floors[i];
floor_setup->floor_type = get_bits(gb, 16);
av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
if (floor_setup->floor_type == 1) {
int maximum_class = -1;
unsigned rangebits, rangemax, floor1_values = 2;
floor_setup->decode = vorbis_floor1_decode;
floor_setup->data.t1.partitions = get_bits(gb, 5);
av_dlog(NULL, " %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_dlog(NULL, " %d. floor %d partition class %d \n",
i, j, floor_setup->data.t1.partition_class[j]);
}
av_dlog(NULL, " 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_dlog(NULL, " %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_dlog(NULL, " 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_dlog(NULL, " 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(*floor_setup->data.t1.list));
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: %u (%"PRIu32")\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_dlog(NULL, " %u. 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) {
unsigned 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;
unsigned 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(*floor_setup->data.t0.lsp));
if (!floor_setup->data.t0.lsp)
return -1;
/* debug output parsed headers */
av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
av_dlog(NULL, "floor0 bark map size: %u\n",
floor_setup->data.t0.bark_map_size);
av_dlog(NULL, "floor0 amplitude bits: %u\n",
floor_setup->data.t0.amplitude_bits);
av_dlog(NULL, "floor0 amplitude offset: %u\n",
floor_setup->data.t0.amplitude_offset);
av_dlog(NULL, "floor0 number of books: %u\n",
floor_setup->data.t0.num_books);
av_dlog(NULL, "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_dlog(NULL, " Book %d: %u\n", idx + 1,
floor_setup->data.t0.book_list[idx]);
}
}
} 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;
unsigned i, j, k;
vc->residue_count = get_bits(gb, 6)+1;
vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
for (i = 0; i < vc->residue_count; ++i) {
vorbis_residue *res_setup = &vc->residues[i];
uint8_t cascade[64];
unsigned high_bits, low_bits;
res_setup->type = get_bits(gb, 16);
av_dlog(NULL, " %u. 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: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\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_dlog(NULL, " 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_dlog(NULL, " %u class cascade 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_dlog(NULL, " %u class cascade depth %u 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;
unsigned i, j;
vc->mapping_count = get_bits(gb, 6)+1;
vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
av_dlog(NULL, " 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(*mapping_setup->magnitude));
mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
sizeof(*mapping_setup->angle));
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_dlog(NULL, " %u mapping coupling steps: %d\n",
i, mapping_setup->coupling_steps);
if (get_bits(gb, 2)) {
av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
return -1; // following spec.
}
if (mapping_setup->submaps>1) {
mapping_setup->mux = av_mallocz(vc->audio_channels *
sizeof(*mapping_setup->mux));
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_dlog(NULL, " %u mapping %u 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, unsigned floor_number)
{
vorbis_floor *floors = vc->floors;
vorbis_floor0 *vf;
int idx;
int blockflag, n;
int32_t *map;
for (blockflag = 0; blockflag < 2; ++blockflag) {
n = vc->blocksize[blockflag] / 2;
floors[floor_number].data.t0.map[blockflag] =
av_malloc((n + 1) * sizeof(int32_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;
}
for (idx = 0; idx <= n; ++idx) {
av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
}
}
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
{
GetBitContext *gb = &vc->gb;
unsigned i;
vc->mode_count = get_bits(gb, 6) + 1;
vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
av_dlog(NULL, " 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_dlog(NULL, " %u 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;
unsigned 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(*vc->channel_residues));
vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
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_dlog(NULL, " 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);
if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;
vc->scale_bias = 1.0f;
} else {
avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
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");