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author | Michael Niedermayer <michaelni@gmx.at> | 2005-05-17 19:02:43 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2005-05-17 19:02:43 +0000 |
commit | 0bde73d907dbe684e01bafc979bf4a04ddeace1d (patch) | |
tree | 8dd3d756524d217cee36e8ab18d59a52b1b94fcc /libavcodec/vorbis.c | |
parent | 5773a746695f445805291d3aa74fa82e948825f2 (diff) | |
download | ffmpeg-streaming-0bde73d907dbe684e01bafc979bf4a04ddeace1d.zip ffmpeg-streaming-0bde73d907dbe684e01bafc979bf4a04ddeace1d.tar.gz |
Vorbis decoder by (Balatoni Denes | dbalatoni programozo hu)
Originally committed as revision 4261 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vorbis.c')
-rw-r--r-- | libavcodec/vorbis.c | 1414 |
1 files changed, 1414 insertions, 0 deletions
diff --git a/libavcodec/vorbis.c b/libavcodec/vorbis.c new file mode 100644 index 0000000..fa60b13 --- /dev/null +++ b/libavcodec/vorbis.c @@ -0,0 +1,1414 @@ +/** + * @file vorbis.c + * Vorbis I decoder + * @author Denes Balatoni ( dbalatoni programozo hu ) + */ + +#undef V_DEBUG + +#include <math.h> + +#define ALT_BITSTREAM_READER_LE +#include "avcodec.h" +#include "bitstream.h" +#include "dsputil.h" + +#include "vorbis.h" + +#define V_NB_BITS 11 +#define V_MAX_VLCS (1<<16) + +#ifndef V_DEBUG +#define AV_DEBUG(...) +#endif + + + +/* Helper functions */ + +/** + * reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader + */ +unsigned int get_bits_long_le(GetBitContext *s, int n){ + if(n<=17) return get_bits(s, n); + else{ + int ret= get_bits(s, 16); + return ret | (get_bits(s, n-16) << 16); + } +} + +static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding + unsigned int ret=0; + while (i!=0) { + ++ret; + i>>=1; + } + return ret; +} + +static unsigned int nth_root(unsigned int x, unsigned int n) { // x^(1/n) + unsigned int ret=0, i, j; + + do { + ++ret; + for(i=0,j=ret;i<n-1;i++) j*=ret; + } while (j<=x); + + return (ret-1); +} + +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)); +} + + +// Generate vlc codes from vorbis huffman code lengths + +static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) { + uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; + + uint_fast8_t i,j; + uint_fast32_t code,p; + +#ifdef V_DEBUG + GetBitContext gb; +#endif + + for(p=0;(bits[p]==0) && (p<num);++p); + if (p==num) { +// av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n"); + return 0; + } + + codes[p]=0; + for(i=0;i<bits[p];++i) { + exit_at_level[i+1]=1<<i; + } + +#ifdef V_DEBUG + av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]); + init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]); + for(i=0;i<bits[p];++i) { + av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0"); + } + av_log(vc->avccontext, AV_LOG_INFO, "\n"); +#endif + + ++p; + + for(;p<num;++p) { + if (bits[p]==0) continue; + // find corresponding exit(node which the tree can grow further from) + for(i=bits[p];i>0;--i) { + if (exit_at_level[i]) break; + } + if (!i) return 1; // overspecified tree + code=exit_at_level[i]; + exit_at_level[i]=0; + // construct code (append 0s to end) and introduce new exits + for(j=i+1;j<=bits[p];++j) { + exit_at_level[j]=code+(1<<(j-1)); + } + codes[p]=code; + +#ifdef V_DEBUG + av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]); + init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]); + for(i=0;i<bits[p];++i) { + av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0"); + } + av_log(vc->avccontext, AV_LOG_INFO, "\n"); +#endif + + } + + //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC) + + return 0; +} + +// 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->residues); + av_freep(&vc->modes); + + ff_mdct_end(&vc->mdct0); + ff_mdct_end(&vc->mdct1); + + 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) { + av_free(vc->floors[i].x_list); + av_free(vc->floors[i].x_list_order); + av_free(vc->floors[i].low_neighbour); + av_free(vc->floors[i].high_neighbour); + } + 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; + GetBitContext *gb=&vc->gb; + + vc->codebook_count=get_bits(gb,8)+1; + + AV_DEBUG(" Codebooks: %d \n", vc->codebook_count); + + vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook)); + + 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; + uint_fast8_t tmp_vlc_bits[V_MAX_VLCS]; + uint_fast32_t tmp_vlc_codes[V_MAX_VLCS]; + +// memset(tmp_vlc_bits, 0, sizeof(tmp_vlc_bits)); + + AV_DEBUG(" %d. Codebook \n", cb); + + if (get_bits(gb, 24)!=0x564342) { + av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb); + return 1; + } + + codebook_setup->dimensions=get_bits(gb, 16); + if (codebook_setup->dimensions>16) { + av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions); + return 1; + } + entries=get_bits(gb, 24); + if (entries>V_MAX_VLCS) { + av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries); + return 1; + } + + 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"); + return 1; + } + } + + 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=nth_root(entries, codebook_setup->dimensions); + uint_fast16_t codebook_multiplicands[codebook_lookup_values]; + + float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32)); + float codebook_delta_value=vorbisfloat2float(get_bits_long_le(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=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)); + 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"); + return 1; + } + entries=used_entries; + } + else if (codebook_setup->lookup_type>=2) { + av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n"); + return 1; + } + +// Initialize VLC table + if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) { + av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n"); + return 1; + } + 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]; + + codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS; + + if (init_vlc(&codebook_setup->vlc, V_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"); + return 1; + } + } + return 0; +} + +// 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 - only floor type 1 is supported + +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=(vorbis_floor *)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->partitions=get_bits(gb, 5); + + AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions); + + for(j=0;j<floor_setup->partitions;++j) { + floor_setup->partition_class[j]=get_bits(gb, 4); + if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j]; + + AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]); + + } + + AV_DEBUG(" maximum class %d \n", maximum_class); + + floor_setup->maximum_class=maximum_class; + + for(j=0;j<=maximum_class;++j) { + floor_setup->class_dimensions[j]=get_bits(gb, 3)+1; + floor_setup->class_subclasses[j]=get_bits(gb, 2); + + AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]); + + if (floor_setup->class_subclasses[j]) { + floor_setup->class_masterbook[j]=get_bits(gb, 8); + + AV_DEBUG(" masterbook: %d \n", floor_setup->class_masterbook[j]); + } + + for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) { + floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1; + + AV_DEBUG(" book %d. : %d \n", k, floor_setup->subclass_books[j][k]); + } + } + + floor_setup->multiplier=get_bits(gb, 2)+1; + floor_setup->x_list_dim=2; + + for(j=0;j<floor_setup->partitions;++j) { + floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]]; + } + + floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t)); + floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t)); + floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t)); + floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t)); + + + rangebits=get_bits(gb, 4); + floor_setup->x_list[0] = 0; + floor_setup->x_list[1] = (1<<rangebits); + + for(j=0;j<floor_setup->partitions;++j) { + for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) { + floor_setup->x_list[floor1_values]=get_bits(gb, rangebits); + + AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]); + } + } + +// Precalculate order of x coordinates - needed for decode + + for(k=0;k<floor_setup->x_list_dim;++k) { + floor_setup->x_list_order[k]=k; + } + + for(k=0;k<floor_setup->x_list_dim-1;++k) { // FIXME optimize sorting ? + for(j=k+1;j<floor_setup->x_list_dim;++j) { + if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) { + uint_fast16_t tmp=floor_setup->x_list_order[k]; + floor_setup->x_list_order[k]=floor_setup->x_list_order[j]; + floor_setup->x_list_order[j]=tmp; + } + } + } + +// Precalculate low and high neighbours + + for(k=2;k<floor_setup->x_list_dim;++k) { + floor_setup->low_neighbour[k]=0; + floor_setup->high_neighbour[k]=1; // correct according to SPEC requirements + + for (j=0;j<k;++j) { + if ((floor_setup->x_list[j]<floor_setup->x_list[k]) && + (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) { + floor_setup->low_neighbour[k]=j; + } + if ((floor_setup->x_list[j]>floor_setup->x_list[k]) && + (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) { + floor_setup->high_neighbour[k]=j; + } + } + } + } + else { + av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \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=(vorbis_residue *)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=(vorbis_mapping *)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=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t)); + mapping_setup->angle=(uint_fast8_t *)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=(uint_fast8_t *)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) { + get_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 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=(vorbis_mode *)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_bits(gb, 1); + 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; + const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 }; + + 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_le(gb, 32); //FIXME check 0 + vc->audio_channels=get_bits(gb, 8); //FIXME check >0 + vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0 + vc->bitrate_maximum=get_bits_long_le(gb, 32); + vc->bitrate_nominal=get_bits_long_le(gb, 32); + vc->bitrate_minimum=get_bits_long_le(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) { + av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n"); + return 3; + } + vc->swin=vwin[bl0-6]; + vc->lwin=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=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); + vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); + vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); + vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); + vc->saved_start=0; + + ff_mdct_init(&vc->mdct0, bl0, 1); + ff_mdct_init(&vc->mdct1, 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->swin[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; + int header_len[3]; + GetBitContext *gb = &(vc->gb); + int i, j, hdr_type; + + vc->avccontext = avccontext; + + if (!headers_len || headers[0]!=2) { + av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); + return -1; + } + + for(j=1,i=0;i<2;++i, ++j) { + header_len[i]=0; + while(j<headers_len && headers[j]==0xff) { + header_len[i]+=0xff; + ++j; + } + if (j>=headers_len) { + av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n"); + return -1; + } + header_len[i]+=headers[j]; + } + header_len[2]=headers_len-header_len[0]-header_len[1]-j; + headers+=j; + + init_get_bits(gb, headers, 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, headers+header_len[0]+header_len[1], 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 (type 1 only) + +static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) { + 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]; + uint_fast8_t 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; + uint_fast16_t *floor_x_sort=vf->x_list_order; + /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ? + int_fast16_t dy, err; + uint_fast16_t lx,hx, ly, hy=0; + + + 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, + V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth); + } + + 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>0) { + floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table, + V_NB_BITS, vc->codebooks[book].maxdepth); + } else { + floor1_Y[offset+j]=0; + } + + AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], 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->low_neighbour[i]; + high_neigh_offs=vf->high_neighbour[i]; + dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin + adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs]; + ady= ABS(dy); + err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]); + 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 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->x_list[i], floor1_Y_final[i], val); + } + +// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ? + + hx=0; + lx=0; + ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC + + vec[0]=floor1_inverse_db_table[ly]; + + for(i=1;i<vf->x_list_dim;++i) { + AV_DEBUG(" Looking at post %d \n", i); + + if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled + int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ????? + + hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier; + hx=vf->x_list[floor_x_sort[i]]; + + dy=hy-ly; + adx=hx-lx; + ady= (dy<0) ? -dy:dy;//ABS(dy); + base=dy/adx; + + AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx); + + x=lx; + y=ly; + err=0; + if (dy<0) { + sy=base-1; + } else { + sy=base+1; + } + ady=ady-(base<0 ? -base : base)*adx; + vec[x]=floor1_inverse_db_table[y]; + + AV_DEBUG(" vec[ %d ] = %d \n", x, y); + + for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) { + err+=ady; + if (err>=adx) { + err-=adx; + y+=sy; + } else { + y+=base; + } + vec[x]=floor1_inverse_db_table[y]; + + AV_DEBUG(" vec[ %d ] = %d \n", x, y); + } + +/* for(j=1;j<hx-lx+1;++j) { // iterating render_point + dy=hy-ly; + adx=hx-lx; + ady= dy<0 ? -dy : dy; + err=ady*j; + off=err/adx; + if (dy<0) { + predicted=ly-off; + } else { + predicted=ly+off; + } + if (lx+j < vf->x_list[1]) { + vec[lx+j]=floor1_inverse_db_table[predicted]; + } + }*/ + + lx=hx; + ly=hy; + } + } + + if (hx<vf->x_list[1]) { + for(i=hx;i<vf->x_list[1];++i) { + vec[i]=floor1_inverse_db_table[hy]; + } + } + + 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]; + 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) { + 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, + V_NB_BITS, vc->codebooks[vr->classbook].maxdepth); + + AV_DEBUG("Classword: %d \n", temp); + + for(i=0;i<c_p_c;++i) { + uint_fast32_t temp2; + + temp2=temp/vr->classifications; + 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) { + uint_fast16_t coffs; + + if (vr->type==0) { + uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions; + + voffs=voffset+j*vlen; + for(k=0;k<step;++k) { + coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table, + V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions; + for(l=0;l<vc->codebooks[vqbook].dimensions;++l) { + vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH + } + } + } + else if (vr->type==1) { + voffs=voffset+j*vlen; + for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) { + coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table, + V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions; + for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) { + vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH + + AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs); + } + } + } + else if (vr->type==2 && ch==2) { // most frequent case optimized + voffs=voffset; + + for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) { + coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table, + V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions; + for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) { + vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l]; // 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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l); + } + } + + } + else if (vr->type==2) { + voffs=voffset; + + for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) { + coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table, + V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions; + for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) { + vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].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], vc->codebooks[vqbook].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; +} + +// 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; + + if (get_bits1(gb)) { + av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n"); + return -1; // packet type not audio + } + + mode_number=get_bits(gb, ilog(vc->mode_count-1)); + 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->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0; + 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(1) + + 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]=vorbis_floor1_decode(vc, floor, 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; + for(j=0;j<blocksize/2;++j) { + float temp; + if (mag[j]>0.0) { + if (ang[j]>0.0) { + ang[j]=mag[j]-ang[j]; + } else { + temp=ang[j]; + ang[j]=mag[j]; + mag[j]+=temp; + } + } else { + if (ang[j]>0.0) { + ang[j]+=mag[j]; + } else { + temp=ang[j]; + ang[j]=mag[j]; + mag[j]-=temp; + } + } + } + } + +// 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; + + for(i=0;i<blocksize/2;++i) { + ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH + } + } + +// 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->lwin; + const float *swin=vc->swin; + float buf[blocksize]; + float buf_tmp[blocksize]; + + ch_floor_ptr=vc->channel_floors+j*blocksize/2; + + saved_start=vc->saved_start; + + ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp); + + if (vc->modes[mode_number].blockflag) { + // -- overlap/add + if (previous_window) { + for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) { + ret[k]=saved[i]+buf[i]*lwin[i]; + } + retlen=vc->blocksize_1/2; + } else { + for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) { + ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i]; + } + for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) { + ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i]; + } + retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4; + } + // -- save + if (next_window) { + for(i=0;i<vc->blocksize_1/2;++i) { + saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i]; + } + saved_start=0; + } else { + saved_start=(vc->blocksize_1-vc->blocksize_0)/4; + for(i=0;i<saved_start;++i) { + saved[i]=buf[vc->blocksize_1/2+i]; + } + for(i=0;i<vc->blocksize_0/2;++i) { + saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i]; + } + } + } else { + // --overlap/add + for(k=j, i=0;i<saved_start;++i, k+=step) { + ret[k]=saved[i]; + } + for(i=0;i<vc->blocksize_0/2;++i, k+=step) { + ret[k]=saved[saved_start+i]+buf[i]*swin[i]; + } + retlen=saved_start+vc->blocksize_0/2; + // -- save + for(i=0;i<vc->blocksize_0/2;++i) { + saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i]; + } + 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, + uint8_t *buf, int buf_size) +{ + vorbis_context *vc = avccontext->priv_data ; + GetBitContext *gb = &(vc->gb); + + int_fast16_t i, len; + + if(!buf_size){ + return 0; + } + + AV_DEBUG("packet length %d \n", buf_size); + + init_get_bits(gb, buf, buf_size*8); + + len=vorbis_parse_audio_packet(vc); + + if (len<=0) { + *data_size=0; + return buf_size; + } + + if (!vc->first_frame) { + vc->first_frame=1; + *data_size=0; + return buf_size ; + } + + AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len); + + for(i=0;i<len;++i) { + int_fast32_t tmp; + + tmp=vc->ret[i]*32768; + if (tmp>32767) tmp=32767; + if (tmp<-32768) tmp=-32768; + ((int16_t*)data)[i]=tmp; + } + *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, +}; + |