/** * @file vorbis_dec.c * Vorbis I decoder * @author Denes Balatoni ( dbalatoni programozo hu ) * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #undef V_DEBUG //#define V_DEBUG //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__) #include <math.h> #define ALT_BITSTREAM_READER_LE #include "avcodec.h" #include "bitstream.h" #include "dsputil.h" #include "vorbis.h" #include "xiph.h" #define V_NB_BITS 8 #define V_NB_BITS2 11 #define V_MAX_VLCS (1<<16) #ifndef V_DEBUG #define AV_DEBUG(...) #endif #undef NDEBUG #include <assert.h> typedef struct { uint_fast8_t dimensions; uint_fast8_t lookup_type; uint_fast8_t maxdepth; VLC vlc; float *codevectors; unsigned int nb_bits; } vorbis_codebook; typedef union vorbis_floor_u vorbis_floor_data; typedef struct vorbis_floor0_s vorbis_floor0; typedef struct vorbis_floor1_s vorbis_floor1; struct vorbis_context_s; typedef uint_fast8_t (* vorbis_floor_decode_func) (struct vorbis_context_s *, vorbis_floor_data *, float *); typedef struct { uint_fast8_t floor_type; vorbis_floor_decode_func decode; union vorbis_floor_u { struct vorbis_floor0_s { uint_fast8_t order; uint_fast16_t rate; uint_fast16_t bark_map_size; int_fast32_t * map[2]; uint_fast32_t map_size[2]; uint_fast8_t amplitude_bits; uint_fast8_t amplitude_offset; uint_fast8_t num_books; uint_fast8_t * book_list; float * lsp; } t0; struct vorbis_floor1_s { uint_fast8_t partitions; uint_fast8_t maximum_class; uint_fast8_t partition_class[32]; uint_fast8_t class_dimensions[16]; uint_fast8_t class_subclasses[16]; uint_fast8_t class_masterbook[16]; int_fast16_t subclass_books[16][8]; uint_fast8_t multiplier; uint_fast16_t x_list_dim; floor1_entry_t * 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; MDCTContext 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 float *channel_residues; float *channel_floors; float *saved; uint_fast16_t saved_start; float *ret; float *buf; float *buf_tmp; uint_fast32_t add_bias; // for float->int conversion uint_fast32_t exp_bias; } vorbis_context; /* Helper functions */ #define BARK(x) \ (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x)) static float vorbisfloat2float(uint_fast32_t val) { double mant=val&0x1fffff; long exp=(val&0x7fe00000L)>>21; if (val&0x80000000) mant=-mant; return(ldexp(mant, exp-20-768)); } // Free all allocated memory ----------------------------------------- static void vorbis_free(vorbis_context *vc) { int_fast16_t i; av_freep(&vc->channel_residues); av_freep(&vc->channel_floors); av_freep(&vc->saved); av_freep(&vc->ret); av_freep(&vc->buf); av_freep(&vc->buf_tmp); 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); if(vc->exp_bias){ av_freep(&vc->win[0]); av_freep(&vc->win[1]); } } // Parse setup header ------------------------------------------------- // Process codebooks part static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) { uint_fast16_t cb; uint8_t *tmp_vlc_bits; uint32_t *tmp_vlc_codes; GetBitContext *gb=&vc->gb; vc->codebook_count=get_bits(gb,8)+1; AV_DEBUG(" Codebooks: %d \n", vc->codebook_count); vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook)); tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t)); tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t)); for(cb=0;cb<vc->codebook_count;++cb) { vorbis_codebook *codebook_setup=&vc->codebooks[cb]; uint_fast8_t ordered; uint_fast32_t t, used_entries=0; uint_fast32_t entries; AV_DEBUG(" %d. Codebook \n", cb); if (get_bits(gb, 24)!=0x564342) { av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb); goto error; } codebook_setup->dimensions=get_bits(gb, 16); if (codebook_setup->dimensions>16) { av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions); goto error; } entries=get_bits(gb, 24); if (entries>V_MAX_VLCS) { av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries); goto error; } ordered=get_bits1(gb); AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries); if (!ordered) { uint_fast16_t ce; uint_fast8_t flag; uint_fast8_t sparse=get_bits1(gb); AV_DEBUG(" not ordered \n"); if (sparse) { AV_DEBUG(" sparse \n"); used_entries=0; for(ce=0;ce<entries;++ce) { flag=get_bits1(gb); if (flag) { tmp_vlc_bits[ce]=get_bits(gb, 5)+1; ++used_entries; } else tmp_vlc_bits[ce]=0; } } else { AV_DEBUG(" not sparse \n"); used_entries=entries; for(ce=0;ce<entries;++ce) { tmp_vlc_bits[ce]=get_bits(gb, 5)+1; } } } else { uint_fast16_t current_entry=0; uint_fast8_t current_length=get_bits(gb, 5)+1; AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME used_entries=entries; for(;current_entry<used_entries;++current_length) { uint_fast16_t i, number; AV_DEBUG(" number bits: %d ", ilog(entries - current_entry)); number=get_bits(gb, ilog(entries - current_entry)); AV_DEBUG(" number: %d \n", number); for(i=current_entry;i<number+current_entry;++i) { if (i<used_entries) tmp_vlc_bits[i]=current_length; } current_entry+=number; } if (current_entry>used_entries) { av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n"); goto error; } } codebook_setup->lookup_type=get_bits(gb, 4); AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" ); // If the codebook is used for (inverse) VQ, calculate codevectors. if (codebook_setup->lookup_type==1) { uint_fast16_t i, j, k; uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions); uint_fast16_t codebook_multiplicands[codebook_lookup_values]; float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32)); float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32)); uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1; uint_fast8_t codebook_sequence_p=get_bits1(gb); AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values); AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value); for(i=0;i<codebook_lookup_values;++i) { codebook_multiplicands[i]=get_bits(gb, codebook_value_bits); AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value); AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]); } // Weed out unused vlcs and build codevector vector codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL; for(j=0, i=0;i<entries;++i) { uint_fast8_t dim=codebook_setup->dimensions; if (tmp_vlc_bits[i]) { float last=0.0; uint_fast32_t lookup_offset=i; #ifdef V_DEBUG av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i); #endif for(k=0;k<dim;++k) { uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values; codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last; if (codebook_sequence_p) { last=codebook_setup->codevectors[j*dim+k]; } lookup_offset/=codebook_lookup_values; } tmp_vlc_bits[j]=tmp_vlc_bits[i]; #ifdef V_DEBUG av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j); for(k=0;k<dim;++k) { av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]); } av_log(vc->avccontext, AV_LOG_INFO, "\n"); #endif ++j; } } if (j!=used_entries) { av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n"); goto error; } entries=used_entries; } else if (codebook_setup->lookup_type>=2) { av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n"); goto error; } // Initialize VLC table if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) { av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n"); goto error; } codebook_setup->maxdepth=0; for(t=0;t<entries;++t) if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t]; if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2; else codebook_setup->nb_bits=V_NB_BITS; codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits; if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) { av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n"); goto error; } } av_free(tmp_vlc_bits); av_free(tmp_vlc_codes); return 0; // Error: error: av_free(tmp_vlc_bits); av_free(tmp_vlc_codes); return 1; } // Process time domain transforms part (unused in Vorbis I) static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) { GetBitContext *gb=&vc->gb; uint_fast8_t i; uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1; for(i=0;i<vorbis_time_count;++i) { uint_fast16_t vorbis_tdtransform=get_bits(gb, 16); AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform); if (vorbis_tdtransform) { av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n"); return 1; } } return 0; } // Process floors part static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec); static void create_map( vorbis_context * vc, uint_fast8_t floor_number ); static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec); static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) { GetBitContext *gb=&vc->gb; uint_fast16_t i,j,k; vc->floor_count=get_bits(gb, 6)+1; vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor)); for (i=0;i<vc->floor_count;++i) { vorbis_floor *floor_setup=&vc->floors[i]; floor_setup->floor_type=get_bits(gb, 16); AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type); if (floor_setup->floor_type==1) { uint_fast8_t maximum_class=0; uint_fast8_t rangebits; uint_fast16_t floor1_values=2; floor_setup->decode=vorbis_floor1_decode; floor_setup->data.t1.partitions=get_bits(gb, 5); AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions); for(j=0;j<floor_setup->data.t1.partitions;++j) { floor_setup->data.t1.partition_class[j]=get_bits(gb, 4); if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j]; AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]); } AV_DEBUG(" maximum class %d \n", maximum_class); floor_setup->data.t1.maximum_class=maximum_class; for(j=0;j<=maximum_class;++j) { floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1; floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2); AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]); if (floor_setup->data.t1.class_subclasses[j]) { floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8); AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]); } for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) { floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1; AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]); } } floor_setup->data.t1.multiplier=get_bits(gb, 2)+1; floor_setup->data.t1.x_list_dim=2; for(j=0;j<floor_setup->data.t1.partitions;++j) { floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; } floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(floor1_entry_t)); rangebits=get_bits(gb, 4); floor_setup->data.t1.list[0].x = 0; floor_setup->data.t1.list[1].x = (1<<rangebits); for(j=0;j<floor_setup->data.t1.partitions;++j) { for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) { floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits); AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x); } } // Precalculate order of x coordinates - needed for decode ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim); } else if(floor_setup->floor_type==0) { uint_fast8_t max_codebook_dim=0; floor_setup->decode=vorbis_floor0_decode; floor_setup->data.t0.order=get_bits(gb, 8); floor_setup->data.t0.rate=get_bits(gb, 16); floor_setup->data.t0.bark_map_size=get_bits(gb, 16); floor_setup->data.t0.amplitude_bits=get_bits(gb, 6); /* zero would result in a div by zero later * * 2^0 - 1 == 0 */ if (floor_setup->data.t0.amplitude_bits == 0) { av_log(vc->avccontext, AV_LOG_ERROR, "Floor 0 amplitude bits is 0.\n"); return 1; } floor_setup->data.t0.amplitude_offset=get_bits(gb, 8); floor_setup->data.t0.num_books=get_bits(gb, 4)+1; /* allocate mem for booklist */ floor_setup->data.t0.book_list= av_malloc(floor_setup->data.t0.num_books); if(!floor_setup->data.t0.book_list) { return 1; } /* read book indexes */ { int idx; uint_fast8_t book_idx; for (idx=0;idx<floor_setup->data.t0.num_books;++idx) { book_idx=get_bits(gb, 8); floor_setup->data.t0.book_list[idx]=book_idx; if (vc->codebooks[book_idx].dimensions > max_codebook_dim) max_codebook_dim=vc->codebooks[book_idx].dimensions; if (floor_setup->data.t0.book_list[idx]>vc->codebook_count) return 1; } } create_map( vc, i ); /* allocate mem for lsp coefficients */ { /* codebook dim is for padding if codebook dim doesn't * * divide order+1 then we need to read more data */ floor_setup->data.t0.lsp= av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim) * sizeof(float)); if(!floor_setup->data.t0.lsp) { return 1; } } #ifdef V_DEBUG /* debug output parsed headers */ AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order); AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate); AV_DEBUG("floor0 bark map size: %u\n", floor_setup->data.t0.bark_map_size); AV_DEBUG("floor0 amplitude bits: %u\n", floor_setup->data.t0.amplitude_bits); AV_DEBUG("floor0 amplitude offset: %u\n", floor_setup->data.t0.amplitude_offset); AV_DEBUG("floor0 number of books: %u\n", floor_setup->data.t0.num_books); AV_DEBUG("floor0 book list pointer: %p\n", floor_setup->data.t0.book_list); { int idx; for (idx=0;idx<floor_setup->data.t0.num_books;++idx) { AV_DEBUG( " Book %d: %u\n", idx+1, floor_setup->data.t0.book_list[idx] ); } } #endif } else { av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n"); return 1; } } return 0; } // Process residues part static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){ GetBitContext *gb=&vc->gb; uint_fast8_t i, j, k; vc->residue_count=get_bits(gb, 6)+1; vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue)); AV_DEBUG(" There are %d residues. \n", vc->residue_count); for(i=0;i<vc->residue_count;++i) { vorbis_residue *res_setup=&vc->residues[i]; uint_fast8_t cascade[64]; uint_fast8_t high_bits; uint_fast8_t low_bits; res_setup->type=get_bits(gb, 16); AV_DEBUG(" %d. residue type %d \n", i, res_setup->type); res_setup->begin=get_bits(gb, 24); res_setup->end=get_bits(gb, 24); res_setup->partition_size=get_bits(gb, 24)+1; res_setup->classifications=get_bits(gb, 6)+1; res_setup->classbook=get_bits(gb, 8); AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size, res_setup->classifications, res_setup->classbook); for(j=0;j<res_setup->classifications;++j) { high_bits=0; low_bits=get_bits(gb, 3); if (get_bits1(gb)) { high_bits=get_bits(gb, 5); } cascade[j]=(high_bits<<3)+low_bits; AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j])); } res_setup->maxpass=0; for(j=0;j<res_setup->classifications;++j) { for(k=0;k<8;++k) { if (cascade[j]&(1<<k)) { res_setup->books[j][k]=get_bits(gb, 8); AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]); if (k>res_setup->maxpass) { res_setup->maxpass=k; } } else { res_setup->books[j][k]=-1; } } } } return 0; } // Process mappings part static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) { GetBitContext *gb=&vc->gb; uint_fast8_t i, j; vc->mapping_count=get_bits(gb, 6)+1; vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping)); AV_DEBUG(" There are %d mappings. \n", vc->mapping_count); for(i=0;i<vc->mapping_count;++i) { vorbis_mapping *mapping_setup=&vc->mappings[i]; if (get_bits(gb, 16)) { av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n"); return 1; } if (get_bits1(gb)) { mapping_setup->submaps=get_bits(gb, 4)+1; } else { mapping_setup->submaps=1; } if (get_bits1(gb)) { mapping_setup->coupling_steps=get_bits(gb, 8)+1; mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); mapping_setup->angle =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); for(j=0;j<mapping_setup->coupling_steps;++j) { mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1)); mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1)); // FIXME: sanity checks } } else { mapping_setup->coupling_steps=0; } AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps); if(get_bits(gb, 2)) { av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i); return 1; // following spec. } if (mapping_setup->submaps>1) { mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t)); for(j=0;j<vc->audio_channels;++j) { mapping_setup->mux[j]=get_bits(gb, 4); } } for(j=0;j<mapping_setup->submaps;++j) { skip_bits(gb, 8); // FIXME check? mapping_setup->submap_floor[j]=get_bits(gb, 8); mapping_setup->submap_residue[j]=get_bits(gb, 8); AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]); } } return 0; } // Process modes part static void create_map( vorbis_context * vc, uint_fast8_t floor_number ) { vorbis_floor * floors=vc->floors; vorbis_floor0 * vf; int idx; int_fast8_t blockflag; int_fast32_t * map; int_fast32_t n; //TODO: could theoretically be smaller? for (blockflag=0;blockflag<2;++blockflag) { n=vc->blocksize[blockflag]/2; floors[floor_number].data.t0.map[blockflag]= av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel map=floors[floor_number].data.t0.map[blockflag]; vf=&floors[floor_number].data.t0; for (idx=0; idx<n;++idx) { map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) * ((vf->bark_map_size)/ BARK(vf->rate/2.0f )) ); if (vf->bark_map_size-1 < map[idx]) { map[idx]=vf->bark_map_size-1; } } map[n]=-1; vf->map_size[blockflag]=n; } # ifdef V_DEBUG for(idx=0;idx<=n;++idx) { AV_DEBUG("floor0 map: map at pos %d is %d\n", idx, map[idx]); } # endif } static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) { GetBitContext *gb=&vc->gb; uint_fast8_t i; vc->mode_count=get_bits(gb, 6)+1; vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode)); AV_DEBUG(" There are %d modes.\n", vc->mode_count); for(i=0;i<vc->mode_count;++i) { vorbis_mode *mode_setup=&vc->modes[i]; mode_setup->blockflag=get_bits1(gb); mode_setup->windowtype=get_bits(gb, 16); //FIXME check mode_setup->transformtype=get_bits(gb, 16); //FIXME check mode_setup->mapping=get_bits(gb, 8); //FIXME check AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping); } return 0; } // Process the whole setup header using the functions above static int vorbis_parse_setup_hdr(vorbis_context *vc) { GetBitContext *gb=&vc->gb; if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n"); return 1; } if (vorbis_parse_setup_hdr_codebooks(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n"); return 2; } if (vorbis_parse_setup_hdr_tdtransforms(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n"); return 3; } if (vorbis_parse_setup_hdr_floors(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n"); return 4; } if (vorbis_parse_setup_hdr_residues(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n"); return 5; } if (vorbis_parse_setup_hdr_mappings(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n"); return 6; } if (vorbis_parse_setup_hdr_modes(vc)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n"); return 7; } if (!get_bits1(gb)) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n"); return 8; // framing flag bit unset error } return 0; } // Process the identification header static int vorbis_parse_id_hdr(vorbis_context *vc){ GetBitContext *gb=&vc->gb; uint_fast8_t bl0, bl1; if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n"); return 1; } vc->version=get_bits_long(gb, 32); //FIXME check 0 vc->audio_channels=get_bits(gb, 8); //FIXME check >0 vc->audio_samplerate=get_bits_long(gb, 32); //FIXME check >0 vc->bitrate_maximum=get_bits_long(gb, 32); vc->bitrate_nominal=get_bits_long(gb, 32); vc->bitrate_minimum=get_bits_long(gb, 32); bl0=get_bits(gb, 4); bl1=get_bits(gb, 4); vc->blocksize[0]=(1<<bl0); vc->blocksize[1]=(1<<bl1); if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) { av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n"); return 3; } // output format int16 if (vc->blocksize[1]/2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) { av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes " "output packets too large.\n"); return 4; } vc->win[0]=ff_vorbis_vwin[bl0-6]; vc->win[1]=ff_vorbis_vwin[bl1-6]; if(vc->exp_bias){ int i, j; for(j=0; j<2; j++){ float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float)); for(i=0; i<vc->blocksize[j]/2; i++) win[i] = vc->win[j][i] * (1<<15); vc->win[j] = win; } } 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]/2)*vc->audio_channels * sizeof(float)); vc->ret = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float)); vc->buf = av_malloc( vc->blocksize[1] * sizeof(float)); vc->buf_tmp = av_malloc( vc->blocksize[1] * sizeof(float)); vc->saved_start=0; ff_mdct_init(&vc->mdct[0], bl0, 1); ff_mdct_init(&vc->mdct[1], bl1, 1); 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 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 == ff_float_to_int16_c) { vc->add_bias = 385; vc->exp_bias = 0; } else { vc->add_bias = 0; vc->exp_bias = 15<<23; } if (!headers_len) { av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); return -1; } if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) { av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); return -1; } init_get_bits(gb, header_start[0], header_len[0]*8); hdr_type=get_bits(gb, 8); if (hdr_type!=1) { av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n"); return -1; } if (vorbis_parse_id_hdr(vc)) { av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n"); vorbis_free(vc); return -1; } init_get_bits(gb, header_start[2], header_len[2]*8); hdr_type=get_bits(gb, 8); if (hdr_type!=5) { av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n"); return -1; } if (vorbis_parse_setup_hdr(vc)) { av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n"); vorbis_free(vc); return -1; } avccontext->channels = vc->audio_channels; avccontext->sample_rate = vc->audio_samplerate; return 0 ; } // Decode audiopackets ------------------------------------------------- // Read and decode floor static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) { vorbis_floor0 * vf=&vfu->t0; float * lsp=vf->lsp; uint_fast32_t amplitude; uint_fast32_t book_idx; uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag; amplitude=get_bits(&vc->gb, vf->amplitude_bits); if (amplitude>0) { float last = 0; uint_fast16_t lsp_len = 0; uint_fast16_t idx; vorbis_codebook codebook; book_idx=get_bits(&vc->gb, ilog(vf->num_books)); if ( book_idx >= vf->num_books ) { av_log( vc->avccontext, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n" ); book_idx= 0; //FIXME: look above } AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx ); codebook=vc->codebooks[vf->book_list[book_idx]]; while (lsp_len<vf->order) { int vec_off; AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions ); AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth ); /* read temp vector */ vec_off=get_vlc2(&vc->gb, codebook.vlc.table, codebook.nb_bits, codebook.maxdepth ) * codebook.dimensions; AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off ); /* copy each vector component and add last to it */ for (idx=0; idx<codebook.dimensions; ++idx) { lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last; } last=lsp[lsp_len+idx-1]; /* set last to last vector component */ lsp_len += codebook.dimensions; } #ifdef V_DEBUG /* DEBUG: output lsp coeffs */ { int idx; for ( idx = 0; idx < lsp_len; ++idx ) AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] ); } #endif /* synthesize floor output vector */ { int i; int order=vf->order; float wstep=M_PI/vf->bark_map_size; for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); } AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n", vf->map_size, order, wstep); i=0; while(i<vf->map_size[blockflag]) { int j, iter_cond=vf->map[blockflag][i]; float p=0.5f; float q=0.5f; float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times /* similar part for the q and p products */ for(j=0;j<order;j+=2) { q *= lsp[j] -two_cos_w; p *= lsp[j+1]-two_cos_w; } if(j==order) { // even order p *= p*(2.0f-two_cos_w); q *= q*(2.0f+two_cos_w); } else { // odd order q *= two_cos_w-lsp[j]; // one more time for q /* final step and square */ p *= p*(4.f-two_cos_w*two_cos_w); q *= q; } /* calculate linear floor value */ { q=exp( ( ( (amplitude*vf->amplitude_offset)/ (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) ) - vf->amplitude_offset ) * .11512925f ); } /* fill vector */ do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond); } } } else { /* this channel is unused */ return 1; } AV_DEBUG(" Floor0 decoded\n"); return 0; } static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) { vorbis_floor1 * vf=&vfu->t1; GetBitContext *gb=&vc->gb; uint_fast16_t range_v[4]={ 256, 128, 86, 64 }; uint_fast16_t range=range_v[vf->multiplier-1]; uint_fast16_t floor1_Y[vf->x_list_dim]; uint_fast16_t floor1_Y_final[vf->x_list_dim]; int floor1_flag[vf->x_list_dim]; uint_fast8_t class_; uint_fast8_t cdim; uint_fast8_t cbits; uint_fast8_t csub; uint_fast8_t cval; int_fast16_t book; uint_fast16_t offset; uint_fast16_t i,j; /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ? int_fast16_t dy, err; if (!get_bits1(gb)) return 1; // silence // Read values (or differences) for the floor's points floor1_Y[0]=get_bits(gb, ilog(range-1)); floor1_Y[1]=get_bits(gb, ilog(range-1)); AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]); offset=2; for(i=0;i<vf->partitions;++i) { class_=vf->partition_class[i]; cdim=vf->class_dimensions[class_]; cbits=vf->class_subclasses[class_]; csub=(1<<cbits)-1; cval=0; AV_DEBUG("Cbits %d \n", cbits); if (cbits) { // this reads all subclasses for this partition's class cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table, vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3); } for(j=0;j<cdim;++j) { book=vf->subclass_books[class_][cval & csub]; AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb)); cval=cval>>cbits; if (book>-1) { floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table, vc->codebooks[book].nb_bits, 3); } else { floor1_Y[offset+j]=0; } AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]); } offset+=cdim; } // Amplitude calculation from the differences floor1_flag[0]=1; floor1_flag[1]=1; floor1_Y_final[0]=floor1_Y[0]; floor1_Y_final[1]=floor1_Y[1]; for(i=2;i<vf->x_list_dim;++i) { uint_fast16_t val, highroom, lowroom, room; uint_fast16_t high_neigh_offs; uint_fast16_t low_neigh_offs; low_neigh_offs=vf->list[i].low; high_neigh_offs=vf->list[i].high; dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x; ady= FFABS(dy); err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x); off=(int16_t)err/(int16_t)adx; if (dy<0) { predicted=floor1_Y_final[low_neigh_offs]-off; } else { predicted=floor1_Y_final[low_neigh_offs]+off; } // render_point end val=floor1_Y[i]; highroom=range-predicted; lowroom=predicted; if (highroom < lowroom) { room=highroom*2; } else { room=lowroom*2; // SPEC mispelling } if (val) { floor1_flag[low_neigh_offs]=1; floor1_flag[high_neigh_offs]=1; floor1_flag[i]=1; if (val>=room) { if (highroom > lowroom) { floor1_Y_final[i]=val-lowroom+predicted; } else { floor1_Y_final[i]=predicted-val+highroom-1; } } else { if (val & 1) { floor1_Y_final[i]=predicted-(val+1)/2; } else { floor1_Y_final[i]=predicted+val/2; } } } else { floor1_flag[i]=0; floor1_Y_final[i]=predicted; } AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val); } // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ? ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x); AV_DEBUG(" Floor decoded\n"); return 0; } // Read and decode residue static 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) { 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 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); } } } else { av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n"); return 1; } } } j_times_ptns_to_read+=ptns_to_read; } ++partition_count; voffset+=vr->partition_size; } } } return 0; } void vorbis_inverse_coupling(float *mag, float *ang, int blocksize) { int i; for(i=0; i<blocksize; i++) { if (mag[i]>0.0) { if (ang[i]>0.0) { ang[i]=mag[i]-ang[i]; } else { float temp=ang[i]; ang[i]=mag[i]; mag[i]+=temp; } } else { if (ang[i]>0.0) { ang[i]+=mag[i]; } else { float temp=ang[i]; ang[i]=mag[i]; mag[i]-=temp; } } } } // Decode the audio packet using the functions above static int vorbis_parse_audio_packet(vorbis_context *vc) { GetBitContext *gb=&vc->gb; uint_fast8_t previous_window=0,next_window=0; uint_fast8_t mode_number; 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; uint_fast16_t saved_start=0; float fadd_bias = vc->add_bias; if (get_bits1(gb)) { av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n"); return -1; // packet type not audio } if (vc->mode_count==1) { mode_number=0; } else { mode_number=get_bits(gb, ilog(vc->mode_count-1)); } vc->mode_number=mode_number; mapping=&vc->mappings[vc->modes[mode_number].mapping]; AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag); if (vc->modes[mode_number].blockflag) { previous_window=get_bits1(gb); next_window=get_bits1(gb); } blocksize=vc->blocksize[vc->modes[mode_number].blockflag]; 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 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=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); } // MDCT, overlap/add, save data for next overlapping FPMATH for(j=0;j<vc->audio_channels;++j) { uint_fast8_t step=vc->audio_channels; uint_fast16_t k; float *saved=vc->saved+j*vc->blocksize[1]/2; float *ret=vc->ret; const float *lwin=vc->win[1]; const float *swin=vc->win[0]; float *buf=vc->buf; float *buf_tmp=vc->buf_tmp; ch_floor_ptr=vc->channel_floors+j*blocksize/2; saved_start=vc->saved_start; vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp); //FIXME process channels together, to allow faster simd vector_fmul_add_add? if (vc->modes[mode_number].blockflag) { // -- overlap/add if (previous_window) { vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step); retlen=vc->blocksize[1]/2; } else { int len = (vc->blocksize[1]-vc->blocksize[0])/4; buf += len; vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step); k = vc->blocksize[0]/2*step + j; buf += vc->blocksize[0]/2; if(vc->exp_bias){ for(i=0; i<len; i++, k+=step) ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias) } else { for(i=0; i<len; i++, k+=step) ret[k] = buf[i] + fadd_bias; } buf=vc->buf; retlen=vc->blocksize[0]/2+len; } // -- save if (next_window) { buf += vc->blocksize[1]/2; vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2); saved_start=0; } else { saved_start=(vc->blocksize[1]-vc->blocksize[0])/4; buf += vc->blocksize[1]/2; for(i=0; i<saved_start; i++) ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias; vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2); } } else { // --overlap/add if(vc->add_bias) { for(k=j, i=0;i<saved_start;++i, k+=step) ret[k] = saved[i] + fadd_bias; } else { for(k=j, i=0;i<saved_start;++i, k+=step) ret[k] = saved[i]; } vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step); retlen=saved_start+vc->blocksize[0]/2; // -- save buf += vc->blocksize[0]/2; vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2); saved_start=0; } } vc->saved_start=saved_start; return retlen*vc->audio_channels; } // Return the decoded audio packet through the standard api static int vorbis_decode_frame(AVCodecContext *avccontext, void *data, int *data_size, const uint8_t *buf, int buf_size) { vorbis_context *vc = avccontext->priv_data ; GetBitContext *gb = &(vc->gb); 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); vc->dsp.float_to_int16(data, vc->ret, len); *data_size=len*2; return buf_size ; } // Close decoder static int vorbis_decode_close(AVCodecContext *avccontext) { vorbis_context *vc = avccontext->priv_data; vorbis_free(vc); return 0 ; } AVCodec vorbis_decoder = { "vorbis", CODEC_TYPE_AUDIO, CODEC_ID_VORBIS, sizeof(vorbis_context), vorbis_decode_init, NULL, vorbis_decode_close, vorbis_decode_frame, };