/** * @file * Vorbis I decoder * @author Denes Balatoni ( dbalatoni programozo hu ) * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #undef V_DEBUG //#define V_DEBUG //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__) #include #define ALT_BITSTREAM_READER_LE #include "avcodec.h" #include "get_bits.h" #include "dsputil.h" #include "fft.h" #include "vorbis.h" #include "xiph.h" #define V_NB_BITS 8 #define V_NB_BITS2 11 #define V_MAX_VLCS (1 << 16) #define V_MAX_PARTITIONS (1 << 20) #ifndef V_DEBUG #define AV_DEBUG(...) #endif #undef NDEBUG #include 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 const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n"; #define VALIDATE_INDEX(idx, limit) \ if (idx >= limit) {\ av_log(vc->avccontext, AV_LOG_ERROR,\ idx_err_str,\ (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\ return -1;\ } #define GET_VALIDATED_INDEX(idx, bits, limit) \ {\ idx = get_bits(gb, bits);\ VALIDATE_INDEX(idx, limit)\ } static float vorbisfloat2float(uint_fast32_t val) { double mant = val & 0x1fffff; long exp = (val & 0x7fe00000L) >> 21; if (val & 0x80000000) mant = -mant; return ldexp(mant, exp - 20 - 768); } // Free all allocated memory ----------------------------------------- static void vorbis_free(vorbis_context *vc) { int_fast16_t i; av_freep(&vc->channel_residues); av_freep(&vc->channel_floors); av_freep(&vc->saved); 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 || codebook_setup->dimensions == 0) { av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions); goto error; } entries = get_bits(gb, 24); if (entries > V_MAX_VLCS) { av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries); goto error; } ordered = get_bits1(gb); AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries); if (!ordered) { uint_fast16_t ce; uint_fast8_t flag; uint_fast8_t sparse = get_bits1(gb); AV_DEBUG(" not ordered \n"); if (sparse) { AV_DEBUG(" sparse \n"); used_entries = 0; for (ce = 0; ce < entries; ++ce) { flag = get_bits1(gb); if (flag) { tmp_vlc_bits[ce] = get_bits(gb, 5) + 1; ++used_entries; } else tmp_vlc_bits[ce] = 0; } } else { AV_DEBUG(" not sparse \n"); used_entries = entries; for (ce = 0; ce < entries; ++ce) tmp_vlc_bits[ce] = get_bits(gb, 5) + 1; } } else { uint_fast16_t current_entry = 0; uint_fast8_t current_length = get_bits(gb, 5)+1; AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME used_entries = entries; for (; current_entry < used_entries && current_length <= 32; ++current_length) { uint_fast16_t i, number; AV_DEBUG(" number bits: %d ", ilog(entries - current_entry)); number = get_bits(gb, ilog(entries - current_entry)); AV_DEBUG(" number: %d \n", number); for (i = current_entry; i < number+current_entry; ++i) if (i < used_entries) tmp_vlc_bits[i] = current_length; current_entry+=number; } if (current_entry>used_entries) { av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n"); goto error; } } codebook_setup->lookup_type = get_bits(gb, 4); AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup"); // If the codebook is used for (inverse) VQ, calculate codevectors. if (codebook_setup->lookup_type == 1) { uint_fast16_t i, j, k; uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions); 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]) { GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count) AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]); } for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) { int16_t bits = get_bits(gb, 8) - 1; if (bits != -1) VALIDATE_INDEX(bits, vc->codebook_count) floor_setup->data.t1.subclass_books[j][k] = bits; AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]); } } floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1; floor_setup->data.t1.x_list_dim = 2; for (j = 0; j < floor_setup->data.t1.partitions; ++j) floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry)); rangebits = get_bits(gb, 4); 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) { GET_VALIDATED_INDEX(floor_setup->data.t0.book_list[idx], 8, vc->codebook_count) if (vc->codebooks[book_idx].dimensions > max_codebook_dim) max_codebook_dim = vc->codebooks[book_idx].dimensions; } } 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; /* Validations to prevent a buffer overflow later. */ if (res_setup->begin>res_setup->end || res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) || (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) { av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2); return -1; } res_setup->classifications = get_bits(gb, 6) + 1; GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count) AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size, res_setup->classifications, res_setup->classbook); for (j = 0; j < res_setup->classifications; ++j) { high_bits = 0; low_bits = get_bits(gb, 3); if (get_bits1(gb)) high_bits = get_bits(gb, 5); cascade[j] = (high_bits << 3) + low_bits; AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j])); } res_setup->maxpass = 0; for (j = 0; j < res_setup->classifications; ++j) { for (k = 0; k < 8; ++k) { if (cascade[j]&(1 << k)) { GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count) AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]); if (k>res_setup->maxpass) res_setup->maxpass = k; } else { res_setup->books[j][k] = -1; } } } } return 0; } // Process mappings part static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) { GetBitContext *gb = &vc->gb; uint_fast8_t i, j; vc->mapping_count = get_bits(gb, 6)+1; vc->mappings = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping)); AV_DEBUG(" There are %d mappings. \n", vc->mapping_count); for (i = 0; i < vc->mapping_count; ++i) { vorbis_mapping *mapping_setup = &vc->mappings[i]; if (get_bits(gb, 16)) { av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n"); return -1; } if (get_bits1(gb)) { mapping_setup->submaps = get_bits(gb, 4) + 1; } else { mapping_setup->submaps = 1; } if (get_bits1(gb)) { mapping_setup->coupling_steps = get_bits(gb, 8) + 1; mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); for (j = 0; j < mapping_setup->coupling_steps; ++j) { GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels) GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels) } } else { mapping_setup->coupling_steps = 0; } AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps); if (get_bits(gb, 2)) { av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i); return -1; // following spec. } if (mapping_setup->submaps>1) { mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t)); for (j = 0; j < vc->audio_channels; ++j) mapping_setup->mux[j] = get_bits(gb, 4); } for (j = 0; j < mapping_setup->submaps; ++j) { skip_bits(gb, 8); // FIXME check? GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count) GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count) AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]); } } return 0; } // Process modes part static void create_map(vorbis_context *vc, uint_fast8_t floor_number) { vorbis_floor *floors = vc->floors; vorbis_floor0 *vf; int idx; int_fast8_t blockflag; int_fast32_t *map; int_fast32_t n; //TODO: could theoretically be smaller? for (blockflag = 0; blockflag < 2; ++blockflag) { n = vc->blocksize[blockflag] / 2; floors[floor_number].data.t0.map[blockflag] = av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel map = floors[floor_number].data.t0.map[blockflag]; vf = &floors[floor_number].data.t0; for (idx = 0; idx < n; ++idx) { map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) * ((vf->bark_map_size) / BARK(vf->rate / 2.0f))); if (vf->bark_map_size-1 < map[idx]) map[idx] = vf->bark_map_size - 1; } map[n] = -1; vf->map_size[blockflag] = n; } # ifdef V_DEBUG for (idx = 0; idx <= n; ++idx) { AV_DEBUG("floor0 map: map at pos %d is %d\n", idx, map[idx]); } # endif } static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) { GetBitContext *gb = &vc->gb; uint_fast8_t i; vc->mode_count = get_bits(gb, 6) + 1; vc->modes = av_mallocz(vc->mode_count * sizeof(vorbis_mode)); AV_DEBUG(" There are %d modes.\n", vc->mode_count); for (i = 0; i < vc->mode_count; ++i) { vorbis_mode *mode_setup = &vc->modes[i]; mode_setup->blockflag = get_bits1(gb); mode_setup->windowtype = get_bits(gb, 16); //FIXME check mode_setup->transformtype = get_bits(gb, 16); //FIXME check GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count); AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping); } return 0; } // Process the whole setup header using the functions above static int vorbis_parse_setup_hdr(vorbis_context *vc) { GetBitContext *gb = &vc->gb; if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') || (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') || (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n"); return -1; } if (vorbis_parse_setup_hdr_codebooks(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n"); return -2; } if (vorbis_parse_setup_hdr_tdtransforms(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n"); return -3; } if (vorbis_parse_setup_hdr_floors(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n"); return -4; } if (vorbis_parse_setup_hdr_residues(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n"); return -5; } if (vorbis_parse_setup_hdr_mappings(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n"); return -6; } if (vorbis_parse_setup_hdr_modes(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n"); return -7; } if (!get_bits1(gb)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n"); return -8; // framing flag bit unset error } return 0; } // Process the identification header static int vorbis_parse_id_hdr(vorbis_context *vc) { GetBitContext *gb = &vc->gb; uint_fast8_t bl0, bl1; if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') || (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') || (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n"); return -1; } vc->version = get_bits_long(gb, 32); //FIXME check 0 vc->audio_channels = get_bits(gb, 8); if (vc->audio_channels <= 0) { av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n"); return -1; } vc->audio_samplerate = get_bits_long(gb, 32); if (vc->audio_samplerate <= 0) { av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n"); return -1; } vc->bitrate_maximum = get_bits_long(gb, 32); vc->bitrate_nominal = get_bits_long(gb, 32); vc->bitrate_minimum = get_bits_long(gb, 32); bl0 = get_bits(gb, 4); bl1 = get_bits(gb, 4); vc->blocksize[0] = (1 << bl0); vc->blocksize[1] = (1 << bl1); if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n"); return -3; } // output format int16 if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) { av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes " "output packets too large.\n"); return -4; } vc->win[0] = ff_vorbis_vwin[bl0 - 6]; vc->win[1] = ff_vorbis_vwin[bl1 - 6]; if ((get_bits1(gb)) == 0) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n"); return -2; } vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float)); vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float)); vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float)); vc->previous_window = 0; ff_mdct_init(&vc->mdct[0], bl0, 1, vc->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 missing.\n"); return -1; } if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) { av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); return -1; } init_get_bits(gb, header_start[0], header_len[0]*8); hdr_type = get_bits(gb, 8); if (hdr_type != 1) { av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n"); return -1; } if (vorbis_parse_id_hdr(vc)) { av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n"); vorbis_free(vc); return -1; } init_get_bits(gb, header_start[2], header_len[2]*8); hdr_type = get_bits(gb, 8); if (hdr_type != 5) { av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n"); vorbis_free(vc); return -1; } if (vorbis_parse_setup_hdr(vc)) { av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n"); vorbis_free(vc); return -1; } if (vc->audio_channels > 8) avccontext->channel_layout = 0; else avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1]; avccontext->channels = vc->audio_channels; avccontext->sample_rate = vc->audio_samplerate; avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2; avccontext->sample_fmt = 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_lenorder) { 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)) // silence return 1; // Read values (or differences) for the floor's points floor1_Y[0] = get_bits(gb, ilog(range - 1)); floor1_Y[1] = get_bits(gb, ilog(range - 1)); AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]); offset = 2; for (i = 0; i < vf->partitions; ++i) { class_ = vf->partition_class[i]; cdim = vf->class_dimensions[class_]; cbits = vf->class_subclasses[class_]; csub = (1 << cbits) - 1; cval = 0; AV_DEBUG("Cbits %d \n", cbits); if (cbits) // this reads all subclasses for this partition's class cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table, vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3); for (j = 0; j < cdim; ++j) { book = vf->subclass_books[class_][cval & csub]; AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb)); cval = cval >> cbits; if (book > -1) { floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table, vc->codebooks[book].nb_bits, 3); } else { floor1_Y[offset+j] = 0; } AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]); } offset+=cdim; } // Amplitude calculation from the differences floor1_flag[0] = 1; floor1_flag[1] = 1; floor1_Y_final[0] = floor1_Y[0]; floor1_Y_final[1] = floor1_Y[1]; for (i = 2; i < vf->x_list_dim; ++i) { uint_fast16_t val, highroom, lowroom, room; uint_fast16_t high_neigh_offs; uint_fast16_t low_neigh_offs; low_neigh_offs = vf->list[i].low; high_neigh_offs = vf->list[i].high; dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x; ady = FFABS(dy); err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x); off = (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 { GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count) } vc->mode_number = mode_number; mapping = &vc->mappings[vc->modes[mode_number].mapping]; AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag); blockflag = vc->modes[mode_number].blockflag; blocksize = vc->blocksize[blockflag]; if (blockflag) skip_bits(gb, 2); // previous_window, next_window memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ? memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ? // Decode floor for (i = 0; i < vc->audio_channels; ++i) { vorbis_floor *floor; 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); if (vc->audio_channels > 8) { for (i = 0; i < vc->audio_channels; i++) channel_ptrs[i] = vc->channel_floors + i * len; } else { for (i = 0; i < vc->audio_channels; i++) channel_ptrs[i] = vc->channel_floors + len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i]; } vc->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", AVMEDIA_TYPE_AUDIO, CODEC_ID_VORBIS, sizeof(vorbis_context), vorbis_decode_init, NULL, vorbis_decode_close, vorbis_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("Vorbis"), .channel_layouts = ff_vorbis_channel_layouts, };