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author | Aurelien Jacobs <aurel@gnuage.org> | 2007-05-10 15:24:01 +0000 |
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committer | Aurelien Jacobs <aurel@gnuage.org> | 2007-05-10 15:24:01 +0000 |
commit | 07c55d8ea3f952cab2e53db374d28be5e85339ed (patch) | |
tree | 12e13314102015f934999bc63c4dfc6a2d32cf9c /libavcodec/vorbis_dec.c | |
parent | f6bd6eeffd413bd2cbee26ad6845ce4c33c05c25 (diff) | |
download | ffmpeg-streaming-07c55d8ea3f952cab2e53db374d28be5e85339ed.zip ffmpeg-streaming-07c55d8ea3f952cab2e53db374d28be5e85339ed.tar.gz |
rename vorbis.c to vorbis_dec.c and vorbis_common.c to vorbis.c
Originally committed as revision 8981 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vorbis_dec.c')
-rw-r--r-- | libavcodec/vorbis_dec.c | 1638 |
1 files changed, 1638 insertions, 0 deletions
diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c new file mode 100644 index 0000000..e82833d --- /dev/null +++ b/libavcodec/vorbis_dec.c @@ -0,0 +1,1638 @@ +/** + * @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=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook)); + tmp_vlc_bits=(uint8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint8_t)); + tmp_vlc_codes=(uint32_t *)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=(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"); + 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=(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->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=(floor1_entry_t *)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=(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 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=(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; + + 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=(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->buf=(float *)av_malloc(vc->blocksize[1] * sizeof(float)); + vc->buf_tmp=(float *)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" ); + //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) { + 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, + 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, +}; + |