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FFmpeg4/libavcodec/vorbisdec.c

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2023-07-02 12:20:28 +00:00
/**
* @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
*/
/**
* @file
* Vorbis I decoder
* @author Denes Balatoni ( dbalatoni programozo hu )
*/
#include <inttypes.h>
#include <math.h>
#include "libavutil/avassert.h"
#include "libavutil/float_dsp.h"
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "fft.h"
#include "get_bits.h"
#include "internal.h"
#include "vorbis.h"
#include "vorbisdsp.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)
typedef struct vorbis_codebook {
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 vorbis_floor {
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 vorbis_residue {
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 vorbis_mapping {
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 vorbis_mode {
uint8_t blockflag;
uint16_t windowtype;
uint16_t transformtype;
uint8_t mapping;
} vorbis_mode;
typedef struct vorbis_context_s {
AVCodecContext *avctx;
GetBitContext gb;
VorbisDSPContext dsp;
AVFloatDSPContext *fdsp;
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
int8_t previous_window;
float *channel_residues;
float *saved;
} 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->avctx, AV_LOG_ERROR,\
idx_err_str,\
(int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
return AVERROR_INVALIDDATA;\
}
#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->saved);
av_freep(&vc->fdsp);
if (vc->residues)
for (i = 0; i < vc->residue_count; i++)
av_freep(&vc->residues[i].classifs);
av_freep(&vc->residues);
av_freep(&vc->modes);
ff_mdct_end(&vc->mdct[0]);
ff_mdct_end(&vc->mdct[1]);
if (vc->codebooks)
for (i = 0; i < vc->codebook_count; ++i) {
av_freep(&vc->codebooks[i].codevectors);
ff_free_vlc(&vc->codebooks[i].vlc);
}
av_freep(&vc->codebooks);
if (vc->floors)
for (i = 0; i < vc->floor_count; ++i) {
if (vc->floors[i].floor_type == 0) {
av_freep(&vc->floors[i].data.t0.map[0]);
av_freep(&vc->floors[i].data.t0.map[1]);
av_freep(&vc->floors[i].data.t0.book_list);
av_freep(&vc->floors[i].data.t0.lsp);
} else {
av_freep(&vc->floors[i].data.t1.list);
}
}
av_freep(&vc->floors);
if (vc->mappings)
for (i = 0; i < vc->mapping_count; ++i) {
av_freep(&vc->mappings[i].magnitude);
av_freep(&vc->mappings[i].angle);
av_freep(&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 = NULL;
uint32_t *tmp_vlc_codes = NULL;
GetBitContext *gb = &vc->gb;
uint16_t *codebook_multiplicands = NULL;
int ret = 0;
vc->codebook_count = get_bits(gb, 8) + 1;
ff_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));
if (!vc->codebooks ||
!tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
ret = AVERROR(ENOMEM);
goto error;
}
for (cb = 0; cb < vc->codebook_count; ++cb) {
vorbis_codebook *codebook_setup = &vc->codebooks[cb];
unsigned ordered, t, entries, used_entries = 0;
ff_dlog(NULL, " %u. Codebook\n", cb);
if (get_bits(gb, 24) != 0x564342) {
av_log(vc->avctx, AV_LOG_ERROR,
" %u. Codebook setup data corrupt.\n", cb);
ret = AVERROR_INVALIDDATA;
goto error;
}
codebook_setup->dimensions=get_bits(gb, 16);
if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
av_log(vc->avctx, AV_LOG_ERROR,
" %u. Codebook's dimension is invalid (%d).\n",
cb, codebook_setup->dimensions);
ret = AVERROR_INVALIDDATA;
goto error;
}
entries = get_bits(gb, 24);
if (entries > V_MAX_VLCS) {
av_log(vc->avctx, AV_LOG_ERROR,
" %u. Codebook has too many entries (%u).\n",
cb, entries);
ret = AVERROR_INVALIDDATA;
goto error;
}
ordered = get_bits1(gb);
ff_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
codebook_setup->dimensions, entries);
if (!ordered) {
unsigned ce, flag;
unsigned sparse = get_bits1(gb);
ff_dlog(NULL, " not ordered \n");
if (sparse) {
ff_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 {
ff_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;
ff_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;
ff_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
number = get_bits(gb, ilog(entries - current_entry));
ff_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->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
ret = AVERROR_INVALIDDATA;
goto error;
}
}
codebook_setup->lookup_type = get_bits(gb, 4);
ff_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);
ff_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
codebook_lookup_values);
ff_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);
ff_dlog(NULL, " multiplicands*delta+minmum : %e \n",
(float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
ff_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
}
// Weed out unused vlcs and build codevector vector
if (used_entries) {
codebook_setup->codevectors =
av_mallocz_array(used_entries, codebook_setup->dimensions *
sizeof(*codebook_setup->codevectors));
if (!codebook_setup->codevectors) {
ret = AVERROR(ENOMEM);
goto error;
}
} else
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;
ff_dlog(vc->avctx, "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];
ff_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
for (k = 0; k < dim; ++k)
ff_dlog(vc->avctx, " %f ",
codebook_setup->codevectors[j * dim + k]);
ff_dlog(vc->avctx, "\n");
++j;
}
}
if (j != used_entries) {
av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
ret = AVERROR_INVALIDDATA;
goto error;
}
entries = used_entries;
} else if (codebook_setup->lookup_type >= 2) {
av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
ret = AVERROR_INVALIDDATA;
goto error;
}
// Initialize VLC table
if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
ret = AVERROR_INVALIDDATA;
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 ((ret = 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->avctx, 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 ret;
}
// 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);
ff_dlog(NULL, " Vorbis time domain transform %u: %u\n",
vorbis_time_count, vorbis_tdtransform);
if (vorbis_tdtransform) {
av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
return AVERROR_INVALIDDATA;
}
}
return 0;
}
// Process floors part
static int vorbis_floor0_decode(vorbis_context *vc,
vorbis_floor_data *vfu, float *vec);
static int 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, ret;
vc->floor_count = get_bits(gb, 6) + 1;
vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
if (!vc->floors)
return AVERROR(ENOMEM);
for (i = 0; i < vc->floor_count; ++i) {
vorbis_floor *floor_setup = &vc->floors[i];
floor_setup->floor_type = get_bits(gb, 16);
ff_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);
ff_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];
ff_dlog(NULL, " %d. floor %d partition class %d \n",
i, j, floor_setup->data.t1.partition_class[j]);
}
ff_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);
ff_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)
ff_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;
ff_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_array(floor_setup->data.t1.x_list_dim,
sizeof(*floor_setup->data.t1.list));
if (!floor_setup->data.t1.list)
return AVERROR(ENOMEM);
rangebits = get_bits(gb, 4);
if (!rangebits && floor_setup->data.t1.partitions) {
av_log(vc->avctx, AV_LOG_ERROR,
"A rangebits value of 0 is not compliant with the Vorbis I specification.\n");
return AVERROR_INVALIDDATA;
}
rangemax = (1 << rangebits);
if (rangemax > vc->blocksize[1] / 2) {
av_log(vc->avctx, AV_LOG_ERROR,
"Floor value is too large for blocksize: %u (%"PRIu32")\n",
rangemax, vc->blocksize[1] / 2);
return AVERROR_INVALIDDATA;
}
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);
ff_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
if (ff_vorbis_ready_floor1_list(vc->avctx,
floor_setup->data.t1.list,
floor_setup->data.t1.x_list_dim)) {
return AVERROR_INVALIDDATA;
}
} 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);
if (!floor_setup->data.t0.order) {
av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
return AVERROR_INVALIDDATA;
}
floor_setup->data.t0.rate = get_bits(gb, 16);
if (!floor_setup->data.t0.rate) {
av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
return AVERROR_INVALIDDATA;
}
floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
if (!floor_setup->data.t0.bark_map_size) {
av_log(vc->avctx, AV_LOG_ERROR,
"Floor 0 bark map size is 0.\n");
return AVERROR_INVALIDDATA;
}
floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
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 AVERROR(ENOMEM);
/* 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;
}
}
if ((ret = create_map(vc, i)) < 0)
return ret;
/* 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_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
sizeof(*floor_setup->data.t0.lsp));
if (!floor_setup->data.t0.lsp)
return AVERROR(ENOMEM);
/* debug output parsed headers */
ff_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
ff_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
ff_dlog(NULL, "floor0 bark map size: %u\n",
floor_setup->data.t0.bark_map_size);
ff_dlog(NULL, "floor0 amplitude bits: %u\n",
floor_setup->data.t0.amplitude_bits);
ff_dlog(NULL, "floor0 amplitude offset: %u\n",
floor_setup->data.t0.amplitude_offset);
ff_dlog(NULL, "floor0 number of books: %u\n",
floor_setup->data.t0.num_books);
ff_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) {
ff_dlog(NULL, " Book %d: %u\n", idx + 1,
floor_setup->data.t0.book_list[idx]);
}
}
} else {
av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
return AVERROR_INVALIDDATA;
}
}
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));
if (!vc->residues)
return AVERROR(ENOMEM);
ff_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);
ff_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-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
av_log(vc->avctx, 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 AVERROR_INVALIDDATA;
}
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_array(res_setup->ptns_to_read,
vc->audio_channels *
sizeof(*res_setup->classifs));
if (!res_setup->classifs)
return AVERROR(ENOMEM);
ff_dlog(NULL, " begin %"PRIu32" end %"PRIu32" part.size %u classif.s %"PRIu8" classbook %"PRIu8"\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;
ff_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)
ff_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));
if (!vc->mappings)
return AVERROR(ENOMEM);
ff_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->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
return AVERROR_INVALIDDATA;
}
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;
if (vc->audio_channels < 2) {
av_log(vc->avctx, AV_LOG_ERROR,
"Square polar channel mapping with less than two channels is not compliant with the Vorbis I specification.\n");
return AVERROR_INVALIDDATA;
}
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));
if (!mapping_setup->angle || !mapping_setup->magnitude)
return AVERROR(ENOMEM);
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;
}
ff_dlog(NULL, " %u mapping coupling steps: %d\n",
i, mapping_setup->coupling_steps);
if (get_bits(gb, 2)) {
av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
return AVERROR_INVALIDDATA; // following spec.
}
if (mapping_setup->submaps>1) {
mapping_setup->mux = av_mallocz_array(vc->audio_channels,
sizeof(*mapping_setup->mux));
if (!mapping_setup->mux)
return AVERROR(ENOMEM);
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)
ff_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 int 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_array(n + 1, sizeof(int32_t)); // n + sentinel
if (!floors[floor_number].data.t0.map[blockflag])
return AVERROR(ENOMEM);
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) {
ff_dlog(NULL, "floor0 map: map at pos %d is %"PRId32"\n", idx, map[idx]);
}
return 0;
}
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));
if (!vc->modes)
return AVERROR(ENOMEM);
ff_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);
ff_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;
int ret;
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->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
return AVERROR_INVALIDDATA;
}
if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
return ret;
}
if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
return ret;
}
if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
return ret;
}
if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
return ret;
}
if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
return ret;
}
if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
return ret;
}
if (!get_bits1(gb)) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
return AVERROR_INVALIDDATA; // 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->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
return AVERROR_INVALIDDATA;
}
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->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR_INVALIDDATA;
}
vc->audio_samplerate = get_bits_long(gb, 32);
if (vc->audio_samplerate <= 0) {
av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
return AVERROR_INVALIDDATA;
}
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);
if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
return AVERROR_INVALIDDATA;
}
vc->blocksize[0] = (1 << bl0);
vc->blocksize[1] = (1 << bl1);
vc->win[0] = ff_vorbis_vwin[bl0 - 6];
vc->win[1] = ff_vorbis_vwin[bl1 - 6];
if ((get_bits1(gb)) == 0) {
av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
return AVERROR_INVALIDDATA;
}
vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
if (!vc->channel_residues || !vc->saved)
return AVERROR(ENOMEM);
vc->previous_window = -1;
ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
vc->fdsp = avpriv_float_dsp_alloc(vc->avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!vc->fdsp)
return AVERROR(ENOMEM);
ff_dlog(NULL, " vorbis version %"PRIu32" \n audio_channels %"PRIu8" \n audio_samplerate %"PRIu32" \n bitrate_max %"PRIu32" \n bitrate_nom %"PRIu32" \n bitrate_min %"PRIu32" \n blk_0 %"PRIu32" blk_1 %"PRIu32" \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 *avctx)
{
vorbis_context *vc = avctx->priv_data;
uint8_t *headers = avctx->extradata;
int headers_len = avctx->extradata_size;
const uint8_t *header_start[3];
int header_len[3];
GetBitContext *gb = &vc->gb;
int hdr_type, ret;
vc->avctx = avctx;
ff_vorbisdsp_init(&vc->dsp);
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
if (!headers_len) {
av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
return AVERROR_INVALIDDATA;
}
if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
return ret;
}
init_get_bits(gb, header_start[0], header_len[0]*8);
hdr_type = get_bits(gb, 8);
if (hdr_type != 1) {
av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
return AVERROR_INVALIDDATA;
}
if ((ret = vorbis_parse_id_hdr(vc))) {
av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
vorbis_free(vc);
return ret;
}
init_get_bits(gb, header_start[2], header_len[2]*8);
hdr_type = get_bits(gb, 8);
if (hdr_type != 5) {
av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
vorbis_free(vc);
return AVERROR_INVALIDDATA;
}
if ((ret = vorbis_parse_setup_hdr(vc))) {
av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
vorbis_free(vc);
return ret;
}
if (vc->audio_channels > 8)
avctx->channel_layout = 0;
else
avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
avctx->channels = vc->audio_channels;
avctx->sample_rate = vc->audio_samplerate;
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;
unsigned book_idx;
uint64_t amplitude;
unsigned blockflag = vc->modes[vc->mode_number].blockflag;
if (!vf->amplitude_bits)
return 1;
amplitude = get_bits64(&vc->gb, vf->amplitude_bits);
if (amplitude > 0) {
float last = 0;
unsigned idx, lsp_len = 0;
vorbis_codebook codebook;
book_idx = get_bits(&vc->gb, ilog(vf->num_books));
if (book_idx >= vf->num_books) {
av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
book_idx = 0;
}
ff_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
codebook = vc->codebooks[vf->book_list[book_idx]];
/* Invalid codebook! */
if (!codebook.codevectors)
return AVERROR_INVALIDDATA;
while (lsp_len<vf->order) {
int vec_off;
ff_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
ff_dlog(NULL, "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);
if (vec_off < 0)
return AVERROR_INVALIDDATA;
vec_off *= codebook.dimensions;
ff_dlog(NULL, "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;
}
/* DEBUG: output lsp coeffs */
{
int idx;
for (idx = 0; idx < lsp_len; ++idx)
ff_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
}
/* 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]);
ff_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
vf->map_size[blockflag], 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;
}
if (p + q == 0.0)
return AVERROR_INVALIDDATA;
/* calculate linear floor value */
q = exp((((amplitude*vf->amplitude_offset) /
(((1ULL << 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;
}
ff_dlog(NULL, " 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;
uint16_t range_v[4] = { 256, 128, 86, 64 };
unsigned range = range_v[vf->multiplier - 1];
uint16_t floor1_Y[258];
uint16_t floor1_Y_final[258];
int floor1_flag[258];
unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
int book, adx, ady, dy, off, predicted, 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));
ff_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
offset = 2;
for (i = 0; i < vf->partitions; ++i) {
partition_class = vf->partition_class[i];
cdim = vf->class_dimensions[partition_class];
cbits = vf->class_subclasses[partition_class];
csub = (1 << cbits) - 1;
cval = 0;
ff_dlog(NULL, "Cbits %u\n", cbits);
if (cbits) // this reads all subclasses for this partition's class
cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
for (j = 0; j < cdim; ++j) {
book = vf->subclass_books[partition_class][cval & csub];
ff_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
book, cbits, cval, get_bits_count(gb));
cval = cval >> cbits;
if (book > -1) {
int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
vc->codebooks[book].nb_bits, 3);
if (v < 0)
return AVERROR_INVALIDDATA;
floor1_Y[offset+j] = v;
} else {
floor1_Y[offset+j] = 0;
}
ff_dlog(NULL, " 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) {
unsigned val, highroom, lowroom, room, high_neigh_offs, 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 misspelling
}
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] = av_clip_uint16(val - lowroom + predicted);
} else {
floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
}
} else {
if (val & 1) {
floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
} else {
floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
}
}
} else {
floor1_flag[i] = 0;
floor1_Y_final[i] = av_clip_uint16(predicted);
}
ff_dlog(NULL, " Decoded floor(%d) = %u / val %u\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);
ff_dlog(NULL, " Floor decoded\n");
return 0;
}
static av_always_inline int setup_classifs(vorbis_context *vc,
vorbis_residue *vr,
uint8_t *do_not_decode,
unsigned ch_used,
int partition_count,
int ptns_to_read
)
{
vorbis_codebook *codebook = vc->codebooks + vr->classbook;
int p, j, i;
unsigned c_p_c = codebook->dimensions;
unsigned inverse_class = ff_inverse[vr->classifications];
int temp, temp2;
for (p = 0, j = 0; j < ch_used; ++j) {
if (!do_not_decode[j]) {
temp = get_vlc2(&vc->gb, codebook->vlc.table,
codebook->nb_bits, 3);
ff_dlog(NULL, "Classword: %u\n", temp);
av_assert0(temp < 65536);
if (temp < 0) {
av_log(vc->avctx, AV_LOG_ERROR,
"Invalid vlc code decoding %d channel.", j);
return AVERROR_INVALIDDATA;
}
if (vr->classifications == 1) {
for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
if (i < ptns_to_read)
vr->classifs[p + i] = 0;
}
} else {
for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
temp2 = (((uint64_t)temp) * inverse_class) >> 32;
if (i < ptns_to_read)
vr->classifs[p + i] = temp - temp2 * vr->classifications;
temp = temp2;
}
}
}
p += ptns_to_read;
}
return 0;
}
// Read and decode residue
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
vorbis_residue *vr,
unsigned ch,
uint8_t *do_not_decode,
float *vec,
unsigned vlen,
unsigned ch_left,
int vr_type)
{
GetBitContext *gb = &vc->gb;
unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
uint8_t *classifs = vr->classifs;
unsigned pass, ch_used, i, j, k, l;
unsigned max_output = (ch - 1) * vlen;
int ptns_to_read = vr->ptns_to_read;
int libvorbis_bug = 0;
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;
max_output += vr->end / ch;
} else {
ch_used = ch;
max_output += vr->end;
}
if (max_output > ch_left * vlen) {
if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
ptns_to_read--;
libvorbis_bug = 1;
} else {
av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
return AVERROR_INVALIDDATA;
}
}
ff_dlog(NULL, " 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?
int voffset, partition_count, j_times_ptns_to_read;
voffset = vr->begin;
for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
if (!pass) {
int ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read);
if (ret < 0)
return ret;
}
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) {
unsigned voffs;
if (!do_not_decode[j]) {
unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
int vqbook = vr->books[vqclass][pass];
if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
int coffs;
unsigned dim = vc->codebooks[vqbook].dimensions;
unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
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);
if (coffs < 0)
return coffs;
coffs *= dim;
for (l = 0; l < dim; ++l)
vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
}
} 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);
if (coffs < 0)
return coffs;
coffs *= dim;
for (l = 0; l < dim; ++l, ++voffs) {
vec[voffs]+=codebook.codevectors[coffs+l];
ff_dlog(NULL, " 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);
if (coffs < 0)
return coffs;
coffs *= 2;
vec[voffs + k ] += codebook.codevectors[coffs ];
vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
}
} else if (dim == 4) {
for (k = 0; k < step; ++k, voffs += 2) {
coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3);
if (coffs < 0)
return coffs;
coffs *= 4;
vec[voffs ] += codebook.codevectors[coffs ];
vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
}
} else
for (k = 0; k < step; ++k) {
coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3);
if (coffs < 0)
return coffs;
coffs *= dim;
for (l = 0; l < dim; l += 2, voffs++) {
vec[voffs ] += codebook.codevectors[coffs + l ];
vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
ff_dlog(NULL, " 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) {
unsigned voffs_div = ch == 1 ? voffset : FASTDIV(voffset, ch);
unsigned voffs_mod = voffset - voffs_div * ch;
for (k = 0; k < step; ++k) {
coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3);
if (coffs < 0)
return coffs;
coffs *= dim;
for (l = 0; l < dim; ++l) {
vec[voffs_div + voffs_mod * vlen] +=
codebook.codevectors[coffs + l];
ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
pass, voffs_div + voffs_mod * vlen,
vec[voffs_div + voffs_mod * vlen],
codebook.codevectors[coffs + l], coffs, l);
if (++voffs_mod == ch) {
voffs_div++;
voffs_mod = 0;
}
}
}
}
}
}
j_times_ptns_to_read += ptns_to_read;
}
++partition_count;
voffset += vr->partition_size;
}
}
if (libvorbis_bug && !pass) {
for (j = 0; j < ch_used; ++j) {
if (!do_not_decode[j]) {
get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
vc->codebooks[vr->classbook].nb_bits, 3);
}
}
}
}
return 0;
}
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
unsigned ch,
uint8_t *do_not_decode,
float *vec, unsigned vlen,
unsigned ch_left)
{
if (vr->type == 2)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
else if (vr->type == 1)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
else if (vr->type == 0)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
else {
av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
return AVERROR_INVALIDDATA;
}
}
void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t 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, float **floor_ptr)
{
GetBitContext *gb = &vc->gb;
FFTContext *mdct;
int previous_window = vc->previous_window;
unsigned mode_number, blockflag, blocksize;
int i, j;
uint8_t no_residue[255];
uint8_t do_not_decode[255];
vorbis_mapping *mapping;
float *ch_res_ptr = vc->channel_residues;
uint8_t res_chan[255];
unsigned res_num = 0;
int retlen = 0;
unsigned ch_left = vc->audio_channels;
unsigned vlen;
if (get_bits1(gb)) {
av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
return AVERROR_INVALIDDATA; // 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];
ff_dlog(NULL, " Mode number: %u , 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];
vlen = blocksize / 2;
if (blockflag) {
int code = get_bits(gb, 2);
if (previous_window < 0)
previous_window = code>>1;
} else if (previous_window < 0)
previous_window = 0;
memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
for (i = 0; i < vc->audio_channels; ++i)
memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //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, floor_ptr[i]);
if (ret < 0) {
av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
return AVERROR_INVALIDDATA;
}
no_residue[i] = ret;
}
// 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;
unsigned ch = 0;
int ret;
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]];
if (ch_left < ch) {
av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
return AVERROR_INVALIDDATA;
}
if (ch) {
ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
if (ret < 0)
return ret;
}
ch_res_ptr += ch * vlen;
ch_left -= ch;
}
if (ch_left > 0)
return AVERROR_INVALIDDATA;
// Inverse coupling
for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
float *mag, *ang;
mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
}
// Dotproduct, MDCT
mdct = &vc->mdct[blockflag];
for (j = vc->audio_channels-1;j >= 0; j--) {
ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
vc->fdsp->vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
}
// Overlap/add, save data for next overlapping
retlen = (blocksize + vc->blocksize[previous_window]) / 4;
for (j = 0; j < vc->audio_channels; j++) {
unsigned bs0 = vc->blocksize[0];
unsigned bs1 = vc->blocksize[1];
float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
float *saved = vc->saved + j * bs1 / 4;
float *ret = floor_ptr[j];
float *buf = residue;
const float *win = vc->win[blockflag & previous_window];
if (blockflag == previous_window) {
vc->fdsp->vector_fmul_window(ret, saved, buf, win, blocksize / 4);
} else if (blockflag > previous_window) {
vc->fdsp->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->fdsp->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 *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
vorbis_context *vc = avctx->priv_data;
AVFrame *frame = data;
GetBitContext *gb = &vc->gb;
float *channel_ptrs[255];
int i, len, ret;
ff_dlog(NULL, "packet length %d \n", buf_size);
if (*buf == 1 && buf_size > 7) {
if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
return ret;
vorbis_free(vc);
if ((ret = vorbis_parse_id_hdr(vc))) {
av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
vorbis_free(vc);
return ret;
}
if (vc->audio_channels > 8)
avctx->channel_layout = 0;
else
avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
avctx->channels = vc->audio_channels;
avctx->sample_rate = vc->audio_samplerate;
return buf_size;
}
if (*buf == 3 && buf_size > 7) {
av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
return buf_size;
}
if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
return ret;
if ((ret = vorbis_parse_setup_hdr(vc))) {
av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
vorbis_free(vc);
return ret;
}
return buf_size;
}
if (!vc->channel_residues || !vc->modes) {
av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
return AVERROR_INVALIDDATA;
}
/* get output buffer */
frame->nb_samples = vc->blocksize[1] / 2;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if (vc->audio_channels > 8) {
for (i = 0; i < vc->audio_channels; i++)
channel_ptrs[i] = (float *)frame->extended_data[i];
} else {
for (i = 0; i < vc->audio_channels; i++) {
int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
channel_ptrs[ch] = (float *)frame->extended_data[i];
}
}
if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
return ret;
if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
return len;
if (!vc->first_frame) {
vc->first_frame = 1;
*got_frame_ptr = 0;
av_frame_unref(frame);
return buf_size;
}
ff_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
frame->nb_samples = len;
*got_frame_ptr = 1;
return buf_size;
}
// Close decoder
static av_cold int vorbis_decode_close(AVCodecContext *avctx)
{
vorbis_context *vc = avctx->priv_data;
vorbis_free(vc);
return 0;
}
static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
{
vorbis_context *vc = avctx->priv_data;
if (vc->saved) {
memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
sizeof(*vc->saved));
}
vc->previous_window = -1;
vc->first_frame = 0;
}
AVCodec ff_vorbis_decoder = {
.name = "vorbis",
.long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_VORBIS,
.priv_data_size = sizeof(vorbis_context),
.init = vorbis_decode_init,
.close = vorbis_decode_close,
.decode = vorbis_decode_frame,
.flush = vorbis_decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.channel_layouts = ff_vorbis_channel_layouts,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};