ffmpeg / libavcodec / vorbis.c @ 5509bffa
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/**
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* @file vorbis.c
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* Vorbis I decoder
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* @author Denes Balatoni ( dbalatoni programozo hu )
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#undef V_DEBUG
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#include <math.h> |
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#define ALT_BITSTREAM_READER_LE
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#include "avcodec.h" |
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#include "bitstream.h" |
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#include "dsputil.h" |
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#include "vorbis.h" |
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#define V_NB_BITS 8 |
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#define V_NB_BITS2 11 |
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#define V_MAX_VLCS (1<<16) |
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#ifndef V_DEBUG
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#define AV_DEBUG(...)
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#endif
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#undef NDEBUG
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#include <assert.h> |
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/* Helper functions */
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/**
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* reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
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*/
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unsigned int get_bits_long_le(GetBitContext *s, int n){ |
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if(n<=17) return get_bits(s, n); |
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else{
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int ret= get_bits(s, 16); |
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return ret | (get_bits(s, n-16) << 16); |
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} |
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} |
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#define ilog(i) av_log2(2*(i)) |
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static unsigned int nth_root(unsigned int x, unsigned int n) { // x^(1/n) |
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unsigned int ret=0, i, j; |
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do {
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++ret; |
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for(i=0,j=ret;i<n-1;i++) j*=ret; |
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} while (j<=x);
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return (ret-1); |
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} |
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static float vorbisfloat2float(uint_fast32_t val) { |
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double mant=val&0x1fffff; |
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long exp=(val&0x7fe00000L)>>21; |
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if (val&0x80000000) mant=-mant; |
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return(ldexp(mant, exp-20-768)); |
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} |
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// Generate vlc codes from vorbis huffman code lengths
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static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) { |
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uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; |
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uint_fast8_t i,j; |
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uint_fast32_t code,p; |
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#ifdef V_DEBUG
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GetBitContext gb; |
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#endif
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for(p=0;(bits[p]==0) && (p<num);++p); |
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if (p==num) {
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// av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
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return 0; |
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} |
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codes[p]=0;
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for(i=0;i<bits[p];++i) { |
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exit_at_level[i+1]=1<<i; |
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} |
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
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init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]); |
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for(i=0;i<bits[p];++i) { |
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av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0"); |
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} |
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av_log(vc->avccontext, AV_LOG_INFO, "\n");
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#endif
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++p; |
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for(;p<num;++p) {
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if (bits[p]==0) continue; |
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// find corresponding exit(node which the tree can grow further from)
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for(i=bits[p];i>0;--i) { |
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if (exit_at_level[i]) break; |
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} |
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if (!i) return 1; // overspecified tree |
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code=exit_at_level[i]; |
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exit_at_level[i]=0;
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// construct code (append 0s to end) and introduce new exits
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for(j=i+1;j<=bits[p];++j) { |
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exit_at_level[j]=code+(1<<(j-1)); |
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} |
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codes[p]=code; |
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
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init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]); |
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for(i=0;i<bits[p];++i) { |
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av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0"); |
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} |
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av_log(vc->avccontext, AV_LOG_INFO, "\n");
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#endif
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} |
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//FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
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return 0; |
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} |
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// Free all allocated memory -----------------------------------------
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static void vorbis_free(vorbis_context *vc) { |
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int_fast16_t i; |
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av_freep(&vc->channel_residues); |
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av_freep(&vc->channel_floors); |
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av_freep(&vc->saved); |
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av_freep(&vc->ret); |
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av_freep(&vc->buf); |
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av_freep(&vc->buf_tmp); |
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av_freep(&vc->residues); |
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av_freep(&vc->modes); |
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ff_mdct_end(&vc->mdct0); |
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ff_mdct_end(&vc->mdct1); |
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for(i=0;i<vc->codebook_count;++i) { |
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av_free(vc->codebooks[i].codevectors); |
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free_vlc(&vc->codebooks[i].vlc); |
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} |
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av_freep(&vc->codebooks); |
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for(i=0;i<vc->floor_count;++i) { |
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av_free(vc->floors[i].x_list); |
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av_free(vc->floors[i].x_list_order); |
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av_free(vc->floors[i].low_neighbour); |
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av_free(vc->floors[i].high_neighbour); |
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} |
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av_freep(&vc->floors); |
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for(i=0;i<vc->mapping_count;++i) { |
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av_free(vc->mappings[i].magnitude); |
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av_free(vc->mappings[i].angle); |
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av_free(vc->mappings[i].mux); |
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} |
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av_freep(&vc->mappings); |
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} |
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// Parse setup header -------------------------------------------------
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// Process codebooks part
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static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) { |
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uint_fast16_t cb; |
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uint_fast8_t *tmp_vlc_bits; |
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uint_fast32_t *tmp_vlc_codes; |
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GetBitContext *gb=&vc->gb; |
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vc->codebook_count=get_bits(gb,8)+1; |
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AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
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vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
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tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
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tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
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for(cb=0;cb<vc->codebook_count;++cb) { |
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vorbis_codebook *codebook_setup=&vc->codebooks[cb]; |
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uint_fast8_t ordered; |
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uint_fast32_t t, used_entries=0;
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uint_fast32_t entries; |
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AV_DEBUG(" %d. Codebook \n", cb);
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if (get_bits(gb, 24)!=0x564342) { |
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb); |
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goto error;
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} |
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codebook_setup->dimensions=get_bits(gb, 16);
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if (codebook_setup->dimensions>16) { |
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions); |
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goto error;
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} |
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entries=get_bits(gb, 24);
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if (entries>V_MAX_VLCS) {
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av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries); |
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goto error;
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} |
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ordered=get_bits1(gb); |
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AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
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if (!ordered) {
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uint_fast16_t ce; |
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uint_fast8_t flag; |
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uint_fast8_t sparse=get_bits1(gb); |
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AV_DEBUG(" not ordered \n");
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if (sparse) {
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AV_DEBUG(" sparse \n");
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used_entries=0;
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for(ce=0;ce<entries;++ce) { |
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flag=get_bits1(gb); |
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if (flag) {
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tmp_vlc_bits[ce]=get_bits(gb, 5)+1; |
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++used_entries; |
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} |
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else tmp_vlc_bits[ce]=0; |
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} |
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} else {
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AV_DEBUG(" not sparse \n");
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used_entries=entries; |
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for(ce=0;ce<entries;++ce) { |
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tmp_vlc_bits[ce]=get_bits(gb, 5)+1; |
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} |
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} |
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} else {
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uint_fast16_t current_entry=0;
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uint_fast8_t current_length=get_bits(gb, 5)+1; |
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AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME |
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used_entries=entries; |
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for(;current_entry<used_entries;++current_length) {
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uint_fast16_t i, number; |
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AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
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number=get_bits(gb, ilog(entries - current_entry)); |
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AV_DEBUG(" number: %d \n", number);
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for(i=current_entry;i<number+current_entry;++i) {
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if (i<used_entries) tmp_vlc_bits[i]=current_length;
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} |
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current_entry+=number; |
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} |
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if (current_entry>used_entries) {
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av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
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goto error;
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} |
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} |
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codebook_setup->lookup_type=get_bits(gb, 4);
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AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" ); |
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// If the codebook is used for (inverse) VQ, calculate codevectors.
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if (codebook_setup->lookup_type==1) { |
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uint_fast16_t i, j, k; |
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uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions); |
294 |
uint_fast16_t codebook_multiplicands[codebook_lookup_values]; |
295 |
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float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32)); |
297 |
float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32)); |
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uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1; |
299 |
uint_fast8_t codebook_sequence_p=get_bits1(gb); |
300 |
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AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
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AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
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for(i=0;i<codebook_lookup_values;++i) { |
305 |
codebook_multiplicands[i]=get_bits(gb, codebook_value_bits); |
306 |
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AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value); |
308 |
AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
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} |
310 |
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// Weed out unused vlcs and build codevector vector
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codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)); |
313 |
for(j=0, i=0;i<entries;++i) { |
314 |
uint_fast8_t dim=codebook_setup->dimensions; |
315 |
|
316 |
if (tmp_vlc_bits[i]) {
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317 |
float last=0.0; |
318 |
uint_fast32_t lookup_offset=i; |
319 |
|
320 |
#ifdef V_DEBUG
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321 |
av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
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322 |
#endif
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323 |
|
324 |
for(k=0;k<dim;++k) { |
325 |
uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values; |
326 |
codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last; |
327 |
if (codebook_sequence_p) {
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328 |
last=codebook_setup->codevectors[j*dim+k]; |
329 |
} |
330 |
lookup_offset/=codebook_lookup_values; |
331 |
} |
332 |
tmp_vlc_bits[j]=tmp_vlc_bits[i]; |
333 |
|
334 |
#ifdef V_DEBUG
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335 |
av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
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336 |
for(k=0;k<dim;++k) { |
337 |
av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
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338 |
} |
339 |
av_log(vc->avccontext, AV_LOG_INFO, "\n");
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340 |
#endif
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341 |
|
342 |
++j; |
343 |
} |
344 |
} |
345 |
if (j!=used_entries) {
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346 |
av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
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347 |
goto error;
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348 |
} |
349 |
entries=used_entries; |
350 |
} |
351 |
else if (codebook_setup->lookup_type>=2) { |
352 |
av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
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353 |
goto error;
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354 |
} |
355 |
|
356 |
// Initialize VLC table
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357 |
if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
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358 |
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
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359 |
goto error;
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360 |
} |
361 |
codebook_setup->maxdepth=0;
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362 |
for(t=0;t<entries;++t) |
363 |
if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
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364 |
|
365 |
if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2; |
366 |
else codebook_setup->nb_bits=V_NB_BITS;
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367 |
|
368 |
codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
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369 |
|
370 |
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)) { |
371 |
av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
|
372 |
goto error;
|
373 |
} |
374 |
} |
375 |
|
376 |
av_free(tmp_vlc_bits); |
377 |
av_free(tmp_vlc_codes); |
378 |
return 0; |
379 |
|
380 |
// Error:
|
381 |
error:
|
382 |
av_free(tmp_vlc_bits); |
383 |
av_free(tmp_vlc_codes); |
384 |
return 1; |
385 |
} |
386 |
|
387 |
// Process time domain transforms part (unused in Vorbis I)
|
388 |
|
389 |
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) { |
390 |
GetBitContext *gb=&vc->gb; |
391 |
uint_fast8_t i; |
392 |
uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1; |
393 |
|
394 |
for(i=0;i<vorbis_time_count;++i) { |
395 |
uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
|
396 |
|
397 |
AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
|
398 |
|
399 |
if (vorbis_tdtransform) {
|
400 |
av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
|
401 |
return 1; |
402 |
} |
403 |
} |
404 |
return 0; |
405 |
} |
406 |
|
407 |
// Process floors part - only floor type 1 is supported
|
408 |
|
409 |
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) { |
410 |
GetBitContext *gb=&vc->gb; |
411 |
uint_fast16_t i,j,k; |
412 |
|
413 |
vc->floor_count=get_bits(gb, 6)+1; |
414 |
|
415 |
vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
|
416 |
|
417 |
for (i=0;i<vc->floor_count;++i) { |
418 |
vorbis_floor *floor_setup=&vc->floors[i]; |
419 |
|
420 |
floor_setup->floor_type=get_bits(gb, 16);
|
421 |
|
422 |
AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
|
423 |
|
424 |
if (floor_setup->floor_type==1) { |
425 |
uint_fast8_t maximum_class=0;
|
426 |
uint_fast8_t rangebits; |
427 |
uint_fast16_t floor1_values=2;
|
428 |
|
429 |
floor_setup->partitions=get_bits(gb, 5);
|
430 |
|
431 |
AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
|
432 |
|
433 |
for(j=0;j<floor_setup->partitions;++j) { |
434 |
floor_setup->partition_class[j]=get_bits(gb, 4);
|
435 |
if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
|
436 |
|
437 |
AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
|
438 |
|
439 |
} |
440 |
|
441 |
AV_DEBUG(" maximum class %d \n", maximum_class);
|
442 |
|
443 |
floor_setup->maximum_class=maximum_class; |
444 |
|
445 |
for(j=0;j<=maximum_class;++j) { |
446 |
floor_setup->class_dimensions[j]=get_bits(gb, 3)+1; |
447 |
floor_setup->class_subclasses[j]=get_bits(gb, 2);
|
448 |
|
449 |
AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
|
450 |
|
451 |
if (floor_setup->class_subclasses[j]) {
|
452 |
floor_setup->class_masterbook[j]=get_bits(gb, 8);
|
453 |
|
454 |
AV_DEBUG(" masterbook: %d \n", floor_setup->class_masterbook[j]);
|
455 |
} |
456 |
|
457 |
for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) { |
458 |
floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1; |
459 |
|
460 |
AV_DEBUG(" book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
|
461 |
} |
462 |
} |
463 |
|
464 |
floor_setup->multiplier=get_bits(gb, 2)+1; |
465 |
floor_setup->x_list_dim=2;
|
466 |
|
467 |
for(j=0;j<floor_setup->partitions;++j) { |
468 |
floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]]; |
469 |
} |
470 |
|
471 |
floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
|
472 |
floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
|
473 |
floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
|
474 |
floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
|
475 |
|
476 |
|
477 |
rangebits=get_bits(gb, 4);
|
478 |
floor_setup->x_list[0] = 0; |
479 |
floor_setup->x_list[1] = (1<<rangebits); |
480 |
|
481 |
for(j=0;j<floor_setup->partitions;++j) { |
482 |
for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) { |
483 |
floor_setup->x_list[floor1_values]=get_bits(gb, rangebits); |
484 |
|
485 |
AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
|
486 |
} |
487 |
} |
488 |
|
489 |
// Precalculate order of x coordinates - needed for decode
|
490 |
|
491 |
for(k=0;k<floor_setup->x_list_dim;++k) { |
492 |
floor_setup->x_list_order[k]=k; |
493 |
} |
494 |
|
495 |
for(k=0;k<floor_setup->x_list_dim-1;++k) { // FIXME optimize sorting ? |
496 |
for(j=k+1;j<floor_setup->x_list_dim;++j) { |
497 |
if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
|
498 |
uint_fast16_t tmp=floor_setup->x_list_order[k]; |
499 |
floor_setup->x_list_order[k]=floor_setup->x_list_order[j]; |
500 |
floor_setup->x_list_order[j]=tmp; |
501 |
} |
502 |
} |
503 |
} |
504 |
|
505 |
// Precalculate low and high neighbours
|
506 |
|
507 |
for(k=2;k<floor_setup->x_list_dim;++k) { |
508 |
floor_setup->low_neighbour[k]=0;
|
509 |
floor_setup->high_neighbour[k]=1; // correct according to SPEC requirements |
510 |
|
511 |
for (j=0;j<k;++j) { |
512 |
if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
|
513 |
(floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) { |
514 |
floor_setup->low_neighbour[k]=j; |
515 |
} |
516 |
if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
|
517 |
(floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) { |
518 |
floor_setup->high_neighbour[k]=j; |
519 |
} |
520 |
} |
521 |
} |
522 |
} |
523 |
else {
|
524 |
av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
|
525 |
return 1; |
526 |
} |
527 |
} |
528 |
return 0; |
529 |
} |
530 |
|
531 |
// Process residues part
|
532 |
|
533 |
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){ |
534 |
GetBitContext *gb=&vc->gb; |
535 |
uint_fast8_t i, j, k; |
536 |
|
537 |
vc->residue_count=get_bits(gb, 6)+1; |
538 |
vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
|
539 |
|
540 |
AV_DEBUG(" There are %d residues. \n", vc->residue_count);
|
541 |
|
542 |
for(i=0;i<vc->residue_count;++i) { |
543 |
vorbis_residue *res_setup=&vc->residues[i]; |
544 |
uint_fast8_t cascade[64];
|
545 |
uint_fast8_t high_bits; |
546 |
uint_fast8_t low_bits; |
547 |
|
548 |
res_setup->type=get_bits(gb, 16);
|
549 |
|
550 |
AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
|
551 |
|
552 |
res_setup->begin=get_bits(gb, 24);
|
553 |
res_setup->end=get_bits(gb, 24);
|
554 |
res_setup->partition_size=get_bits(gb, 24)+1; |
555 |
res_setup->classifications=get_bits(gb, 6)+1; |
556 |
res_setup->classbook=get_bits(gb, 8);
|
557 |
|
558 |
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,
|
559 |
res_setup->classifications, res_setup->classbook); |
560 |
|
561 |
for(j=0;j<res_setup->classifications;++j) { |
562 |
high_bits=0;
|
563 |
low_bits=get_bits(gb, 3);
|
564 |
if (get_bits1(gb)) {
|
565 |
high_bits=get_bits(gb, 5);
|
566 |
} |
567 |
cascade[j]=(high_bits<<3)+low_bits;
|
568 |
|
569 |
AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
|
570 |
} |
571 |
|
572 |
res_setup->maxpass=0;
|
573 |
for(j=0;j<res_setup->classifications;++j) { |
574 |
for(k=0;k<8;++k) { |
575 |
if (cascade[j]&(1<<k)) { |
576 |
res_setup->books[j][k]=get_bits(gb, 8);
|
577 |
|
578 |
AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
|
579 |
|
580 |
if (k>res_setup->maxpass) {
|
581 |
res_setup->maxpass=k; |
582 |
} |
583 |
} else {
|
584 |
res_setup->books[j][k]=-1;
|
585 |
} |
586 |
} |
587 |
} |
588 |
} |
589 |
return 0; |
590 |
} |
591 |
|
592 |
// Process mappings part
|
593 |
|
594 |
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) { |
595 |
GetBitContext *gb=&vc->gb; |
596 |
uint_fast8_t i, j; |
597 |
|
598 |
vc->mapping_count=get_bits(gb, 6)+1; |
599 |
vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
|
600 |
|
601 |
AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
|
602 |
|
603 |
for(i=0;i<vc->mapping_count;++i) { |
604 |
vorbis_mapping *mapping_setup=&vc->mappings[i]; |
605 |
|
606 |
if (get_bits(gb, 16)) { |
607 |
av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
|
608 |
return 1; |
609 |
} |
610 |
if (get_bits1(gb)) {
|
611 |
mapping_setup->submaps=get_bits(gb, 4)+1; |
612 |
} else {
|
613 |
mapping_setup->submaps=1;
|
614 |
} |
615 |
|
616 |
if (get_bits1(gb)) {
|
617 |
mapping_setup->coupling_steps=get_bits(gb, 8)+1; |
618 |
mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
|
619 |
mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
|
620 |
for(j=0;j<mapping_setup->coupling_steps;++j) { |
621 |
mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
|
622 |
mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
|
623 |
// FIXME: sanity checks
|
624 |
} |
625 |
} else {
|
626 |
mapping_setup->coupling_steps=0;
|
627 |
} |
628 |
|
629 |
AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
|
630 |
|
631 |
if(get_bits(gb, 2)) { |
632 |
av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
|
633 |
return 1; // following spec. |
634 |
} |
635 |
|
636 |
if (mapping_setup->submaps>1) { |
637 |
mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
|
638 |
for(j=0;j<vc->audio_channels;++j) { |
639 |
mapping_setup->mux[j]=get_bits(gb, 4);
|
640 |
} |
641 |
} |
642 |
|
643 |
for(j=0;j<mapping_setup->submaps;++j) { |
644 |
get_bits(gb, 8); // FIXME check? |
645 |
mapping_setup->submap_floor[j]=get_bits(gb, 8);
|
646 |
mapping_setup->submap_residue[j]=get_bits(gb, 8);
|
647 |
|
648 |
AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
|
649 |
} |
650 |
} |
651 |
return 0; |
652 |
} |
653 |
|
654 |
// Process modes part
|
655 |
|
656 |
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) { |
657 |
GetBitContext *gb=&vc->gb; |
658 |
uint_fast8_t i; |
659 |
|
660 |
vc->mode_count=get_bits(gb, 6)+1; |
661 |
vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
|
662 |
|
663 |
AV_DEBUG(" There are %d modes.\n", vc->mode_count);
|
664 |
|
665 |
for(i=0;i<vc->mode_count;++i) { |
666 |
vorbis_mode *mode_setup=&vc->modes[i]; |
667 |
|
668 |
mode_setup->blockflag=get_bits(gb, 1);
|
669 |
mode_setup->windowtype=get_bits(gb, 16); //FIXME check |
670 |
mode_setup->transformtype=get_bits(gb, 16); //FIXME check |
671 |
mode_setup->mapping=get_bits(gb, 8); //FIXME check |
672 |
|
673 |
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);
|
674 |
} |
675 |
return 0; |
676 |
} |
677 |
|
678 |
// Process the whole setup header using the functions above
|
679 |
|
680 |
static int vorbis_parse_setup_hdr(vorbis_context *vc) { |
681 |
GetBitContext *gb=&vc->gb; |
682 |
|
683 |
if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || |
684 |
(get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || |
685 |
(get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { |
686 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
|
687 |
return 1; |
688 |
} |
689 |
|
690 |
if (vorbis_parse_setup_hdr_codebooks(vc)) {
|
691 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
|
692 |
return 2; |
693 |
} |
694 |
if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
|
695 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
|
696 |
return 3; |
697 |
} |
698 |
if (vorbis_parse_setup_hdr_floors(vc)) {
|
699 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
|
700 |
return 4; |
701 |
} |
702 |
if (vorbis_parse_setup_hdr_residues(vc)) {
|
703 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
|
704 |
return 5; |
705 |
} |
706 |
if (vorbis_parse_setup_hdr_mappings(vc)) {
|
707 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
|
708 |
return 6; |
709 |
} |
710 |
if (vorbis_parse_setup_hdr_modes(vc)) {
|
711 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
|
712 |
return 7; |
713 |
} |
714 |
if (!get_bits1(gb)) {
|
715 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
|
716 |
return 8; // framing flag bit unset error |
717 |
} |
718 |
|
719 |
return 0; |
720 |
} |
721 |
|
722 |
// Process the identification header
|
723 |
|
724 |
static int vorbis_parse_id_hdr(vorbis_context *vc){ |
725 |
GetBitContext *gb=&vc->gb; |
726 |
uint_fast8_t bl0, bl1; |
727 |
const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 }; |
728 |
|
729 |
if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') || |
730 |
(get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') || |
731 |
(get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) { |
732 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
|
733 |
return 1; |
734 |
} |
735 |
|
736 |
vc->version=get_bits_long_le(gb, 32); //FIXME check 0 |
737 |
vc->audio_channels=get_bits(gb, 8); //FIXME check >0 |
738 |
vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0 |
739 |
vc->bitrate_maximum=get_bits_long_le(gb, 32);
|
740 |
vc->bitrate_nominal=get_bits_long_le(gb, 32);
|
741 |
vc->bitrate_minimum=get_bits_long_le(gb, 32);
|
742 |
bl0=get_bits(gb, 4);
|
743 |
bl1=get_bits(gb, 4);
|
744 |
vc->blocksize_0=(1<<bl0);
|
745 |
vc->blocksize_1=(1<<bl1);
|
746 |
if (bl0>13 || bl0<6 || bl1>13 || bl1<6) { |
747 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
|
748 |
return 3; |
749 |
} |
750 |
vc->swin=vwin[bl0-6];
|
751 |
vc->lwin=vwin[bl1-6];
|
752 |
|
753 |
if ((get_bits1(gb)) == 0) { |
754 |
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
|
755 |
return 2; |
756 |
} |
757 |
|
758 |
vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); |
759 |
vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); |
760 |
vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); |
761 |
vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float)); |
762 |
vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float)); |
763 |
vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float)); |
764 |
vc->saved_start=0;
|
765 |
|
766 |
ff_mdct_init(&vc->mdct0, bl0, 1);
|
767 |
ff_mdct_init(&vc->mdct1, bl1, 1);
|
768 |
|
769 |
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 ",
|
770 |
vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1); |
771 |
|
772 |
/*
|
773 |
BLK=vc->blocksize_0;
|
774 |
for(i=0;i<BLK/2;++i) {
|
775 |
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)));
|
776 |
}
|
777 |
*/
|
778 |
|
779 |
return 0; |
780 |
} |
781 |
|
782 |
// Process the extradata using the functions above (identification header, setup header)
|
783 |
|
784 |
static int vorbis_decode_init(AVCodecContext *avccontext) { |
785 |
vorbis_context *vc = avccontext->priv_data ; |
786 |
uint8_t *headers = avccontext->extradata; |
787 |
int headers_len=avccontext->extradata_size;
|
788 |
uint8_t *header_start[3];
|
789 |
int header_len[3]; |
790 |
GetBitContext *gb = &(vc->gb); |
791 |
int i, j, hdr_type;
|
792 |
|
793 |
vc->avccontext = avccontext; |
794 |
|
795 |
if (!headers_len) {
|
796 |
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
|
797 |
return -1; |
798 |
} |
799 |
|
800 |
if(headers[0] == 0 && headers[1] == 30) { |
801 |
for(i = 0; i < 3; i++){ |
802 |
header_len[i] = *headers++ << 8;
|
803 |
header_len[i] += *headers++; |
804 |
header_start[i] = headers; |
805 |
headers += header_len[i]; |
806 |
} |
807 |
} else if(headers[0] == 2) { |
808 |
for(j=1,i=0;i<2;++i, ++j) { |
809 |
header_len[i]=0;
|
810 |
while(j<headers_len && headers[j]==0xff) { |
811 |
header_len[i]+=0xff;
|
812 |
++j; |
813 |
} |
814 |
if (j>=headers_len) {
|
815 |
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
|
816 |
return -1; |
817 |
} |
818 |
header_len[i]+=headers[j]; |
819 |
} |
820 |
header_len[2]=headers_len-header_len[0]-header_len[1]-j; |
821 |
headers+=j; |
822 |
header_start[0] = headers;
|
823 |
header_start[1] = header_start[0] + header_len[0]; |
824 |
header_start[2] = header_start[1] + header_len[1]; |
825 |
} else {
|
826 |
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
|
827 |
return -1; |
828 |
} |
829 |
|
830 |
init_get_bits(gb, header_start[0], header_len[0]*8); |
831 |
hdr_type=get_bits(gb, 8);
|
832 |
if (hdr_type!=1) { |
833 |
av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
|
834 |
return -1; |
835 |
} |
836 |
if (vorbis_parse_id_hdr(vc)) {
|
837 |
av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
|
838 |
vorbis_free(vc); |
839 |
return -1; |
840 |
} |
841 |
|
842 |
init_get_bits(gb, header_start[2], header_len[2]*8); |
843 |
hdr_type=get_bits(gb, 8);
|
844 |
if (hdr_type!=5) { |
845 |
av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
|
846 |
return -1; |
847 |
} |
848 |
if (vorbis_parse_setup_hdr(vc)) {
|
849 |
av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
|
850 |
vorbis_free(vc); |
851 |
return -1; |
852 |
} |
853 |
|
854 |
avccontext->channels = vc->audio_channels; |
855 |
avccontext->sample_rate = vc->audio_samplerate; |
856 |
|
857 |
return 0 ; |
858 |
} |
859 |
|
860 |
// Decode audiopackets -------------------------------------------------
|
861 |
|
862 |
// Read and decode floor (type 1 only)
|
863 |
|
864 |
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) { |
865 |
GetBitContext *gb=&vc->gb; |
866 |
uint_fast16_t range_v[4]={ 256, 128, 86, 64 }; |
867 |
uint_fast16_t range=range_v[vf->multiplier-1];
|
868 |
uint_fast16_t floor1_Y[vf->x_list_dim]; |
869 |
uint_fast16_t floor1_Y_final[vf->x_list_dim]; |
870 |
uint_fast8_t floor1_flag[vf->x_list_dim]; |
871 |
uint_fast8_t class_; |
872 |
uint_fast8_t cdim; |
873 |
uint_fast8_t cbits; |
874 |
uint_fast8_t csub; |
875 |
uint_fast8_t cval; |
876 |
int_fast16_t book; |
877 |
uint_fast16_t offset; |
878 |
uint_fast16_t i,j; |
879 |
uint_fast16_t *floor_x_sort=vf->x_list_order; |
880 |
/*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ? |
881 |
int_fast16_t dy, err; |
882 |
uint_fast16_t lx,hx, ly, hy=0;
|
883 |
|
884 |
|
885 |
if (!get_bits1(gb)) return 1; // silence |
886 |
|
887 |
// Read values (or differences) for the floor's points
|
888 |
|
889 |
floor1_Y[0]=get_bits(gb, ilog(range-1)); |
890 |
floor1_Y[1]=get_bits(gb, ilog(range-1)); |
891 |
|
892 |
AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]); |
893 |
|
894 |
offset=2;
|
895 |
for(i=0;i<vf->partitions;++i) { |
896 |
class_=vf->partition_class[i]; |
897 |
cdim=vf->class_dimensions[class_]; |
898 |
cbits=vf->class_subclasses[class_]; |
899 |
csub=(1<<cbits)-1; |
900 |
cval=0;
|
901 |
|
902 |
AV_DEBUG("Cbits %d \n", cbits);
|
903 |
|
904 |
if (cbits) { // this reads all subclasses for this partition's class |
905 |
cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table, |
906 |
vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
|
907 |
} |
908 |
|
909 |
for(j=0;j<cdim;++j) { |
910 |
book=vf->subclass_books[class_][cval & csub]; |
911 |
|
912 |
AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
|
913 |
|
914 |
cval=cval>>cbits; |
915 |
if (book>0) { |
916 |
floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table, |
917 |
vc->codebooks[book].nb_bits, 3);
|
918 |
} else {
|
919 |
floor1_Y[offset+j]=0;
|
920 |
} |
921 |
|
922 |
AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
|
923 |
} |
924 |
offset+=cdim; |
925 |
} |
926 |
|
927 |
// Amplitude calculation from the differences
|
928 |
|
929 |
floor1_flag[0]=1; |
930 |
floor1_flag[1]=1; |
931 |
floor1_Y_final[0]=floor1_Y[0]; |
932 |
floor1_Y_final[1]=floor1_Y[1]; |
933 |
|
934 |
for(i=2;i<vf->x_list_dim;++i) { |
935 |
uint_fast16_t val, highroom, lowroom, room; |
936 |
uint_fast16_t high_neigh_offs; |
937 |
uint_fast16_t low_neigh_offs; |
938 |
|
939 |
low_neigh_offs=vf->low_neighbour[i]; |
940 |
high_neigh_offs=vf->high_neighbour[i]; |
941 |
dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
|
942 |
adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs]; |
943 |
ady= ABS(dy); |
944 |
err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]); |
945 |
off=err/adx; |
946 |
if (dy<0) { |
947 |
predicted=floor1_Y_final[low_neigh_offs]-off; |
948 |
} else {
|
949 |
predicted=floor1_Y_final[low_neigh_offs]+off; |
950 |
} // render_point end
|
951 |
|
952 |
val=floor1_Y[i]; |
953 |
highroom=range-predicted; |
954 |
lowroom=predicted; |
955 |
if (highroom < lowroom) {
|
956 |
room=highroom*2;
|
957 |
} else {
|
958 |
room=lowroom*2; // SPEC mispelling |
959 |
} |
960 |
if (val) {
|
961 |
floor1_flag[low_neigh_offs]=1;
|
962 |
floor1_flag[high_neigh_offs]=1;
|
963 |
floor1_flag[i]=1;
|
964 |
if (val>=room) {
|
965 |
if (highroom > lowroom) {
|
966 |
floor1_Y_final[i]=val-lowroom+predicted; |
967 |
} else {
|
968 |
floor1_Y_final[i]=predicted-val+highroom-1;
|
969 |
} |
970 |
} else {
|
971 |
if (val & 1) { |
972 |
floor1_Y_final[i]=predicted-(val+1)/2; |
973 |
} else {
|
974 |
floor1_Y_final[i]=predicted+val/2;
|
975 |
} |
976 |
} |
977 |
} else {
|
978 |
floor1_flag[i]=0;
|
979 |
floor1_Y_final[i]=predicted; |
980 |
} |
981 |
|
982 |
AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
|
983 |
} |
984 |
|
985 |
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
|
986 |
|
987 |
hx=0;
|
988 |
lx=0;
|
989 |
ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC |
990 |
|
991 |
vec[0]=floor1_inverse_db_table[ly];
|
992 |
|
993 |
for(i=1;i<vf->x_list_dim;++i) { |
994 |
AV_DEBUG(" Looking at post %d \n", i);
|
995 |
|
996 |
if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled |
997 |
int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
|
998 |
|
999 |
hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier; |
1000 |
hx=vf->x_list[floor_x_sort[i]]; |
1001 |
|
1002 |
dy=hy-ly; |
1003 |
adx=hx-lx; |
1004 |
ady= (dy<0) ? -dy:dy;//ABS(dy); |
1005 |
base=dy/adx; |
1006 |
|
1007 |
AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
|
1008 |
|
1009 |
x=lx; |
1010 |
y=ly; |
1011 |
err=0;
|
1012 |
if (dy<0) { |
1013 |
sy=base-1;
|
1014 |
} else {
|
1015 |
sy=base+1;
|
1016 |
} |
1017 |
ady=ady-(base<0 ? -base : base)*adx;
|
1018 |
vec[x]=floor1_inverse_db_table[y]; |
1019 |
|
1020 |
AV_DEBUG(" vec[ %d ] = %d \n", x, y);
|
1021 |
|
1022 |
for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) { |
1023 |
err+=ady; |
1024 |
if (err>=adx) {
|
1025 |
err-=adx; |
1026 |
y+=sy; |
1027 |
} else {
|
1028 |
y+=base; |
1029 |
} |
1030 |
vec[x]=floor1_inverse_db_table[y]; |
1031 |
|
1032 |
AV_DEBUG(" vec[ %d ] = %d \n", x, y);
|
1033 |
} |
1034 |
|
1035 |
/* for(j=1;j<hx-lx+1;++j) { // iterating render_point
|
1036 |
dy=hy-ly;
|
1037 |
adx=hx-lx;
|
1038 |
ady= dy<0 ? -dy : dy;
|
1039 |
err=ady*j;
|
1040 |
off=err/adx;
|
1041 |
if (dy<0) {
|
1042 |
predicted=ly-off;
|
1043 |
} else {
|
1044 |
predicted=ly+off;
|
1045 |
}
|
1046 |
if (lx+j < vf->x_list[1]) {
|
1047 |
vec[lx+j]=floor1_inverse_db_table[predicted];
|
1048 |
}
|
1049 |
}*/
|
1050 |
|
1051 |
lx=hx; |
1052 |
ly=hy; |
1053 |
} |
1054 |
} |
1055 |
|
1056 |
if (hx<vf->x_list[1]) { |
1057 |
for(i=hx;i<vf->x_list[1];++i) { |
1058 |
vec[i]=floor1_inverse_db_table[hy]; |
1059 |
} |
1060 |
} |
1061 |
|
1062 |
AV_DEBUG(" Floor decoded\n");
|
1063 |
|
1064 |
return 0; |
1065 |
} |
1066 |
|
1067 |
// Read and decode residue
|
1068 |
|
1069 |
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) { |
1070 |
GetBitContext *gb=&vc->gb; |
1071 |
uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions; |
1072 |
uint_fast16_t n_to_read=vr->end-vr->begin; |
1073 |
uint_fast16_t ptns_to_read=n_to_read/vr->partition_size; |
1074 |
uint_fast8_t classifs[ptns_to_read*vc->audio_channels]; |
1075 |
uint_fast8_t pass; |
1076 |
uint_fast8_t ch_used; |
1077 |
uint_fast8_t i,j,l; |
1078 |
uint_fast16_t k; |
1079 |
|
1080 |
if (vr->type==2) { |
1081 |
for(j=1;j<ch;++j) { |
1082 |
do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input |
1083 |
} |
1084 |
if (do_not_decode[0]) return 0; |
1085 |
ch_used=1;
|
1086 |
} else {
|
1087 |
ch_used=ch; |
1088 |
} |
1089 |
|
1090 |
AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
|
1091 |
|
1092 |
for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE? |
1093 |
uint_fast16_t voffset; |
1094 |
uint_fast16_t partition_count; |
1095 |
uint_fast16_t j_times_ptns_to_read; |
1096 |
|
1097 |
voffset=vr->begin; |
1098 |
for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error |
1099 |
if (!pass) {
|
1100 |
for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) { |
1101 |
if (!do_not_decode[j]) {
|
1102 |
uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table, |
1103 |
vc->codebooks[vr->classbook].nb_bits, 3);
|
1104 |
|
1105 |
AV_DEBUG("Classword: %d \n", temp);
|
1106 |
|
1107 |
assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[] |
1108 |
for(i=0;i<c_p_c;++i) { |
1109 |
uint_fast32_t temp2; |
1110 |
|
1111 |
temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
|
1112 |
classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
|
1113 |
temp=temp2; |
1114 |
} |
1115 |
} |
1116 |
j_times_ptns_to_read+=ptns_to_read; |
1117 |
} |
1118 |
} |
1119 |
for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) { |
1120 |
for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) { |
1121 |
uint_fast16_t voffs; |
1122 |
|
1123 |
if (!do_not_decode[j]) {
|
1124 |
uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count]; |
1125 |
int_fast16_t vqbook=vr->books[vqclass][pass]; |
1126 |
|
1127 |
if (vqbook>=0) { |
1128 |
uint_fast16_t coffs; |
1129 |
uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions; |
1130 |
vorbis_codebook codebook= vc->codebooks[vqbook]; |
1131 |
|
1132 |
if (vr->type==0) { |
1133 |
|
1134 |
voffs=voffset+j*vlen; |
1135 |
for(k=0;k<step;++k) { |
1136 |
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
|
1137 |
for(l=0;l<codebook.dimensions;++l) { |
1138 |
vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
|
1139 |
} |
1140 |
} |
1141 |
} |
1142 |
else if (vr->type==1) { |
1143 |
voffs=voffset+j*vlen; |
1144 |
for(k=0;k<step;++k) { |
1145 |
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
|
1146 |
for(l=0;l<codebook.dimensions;++l, ++voffs) { |
1147 |
vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
|
1148 |
|
1149 |
AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
|
1150 |
} |
1151 |
} |
1152 |
} |
1153 |
else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized |
1154 |
voffs=voffset>>1;
|
1155 |
|
1156 |
for(k=0;k<step;++k) { |
1157 |
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
|
1158 |
for(l=0;l<codebook.dimensions;l+=2, voffs++) { |
1159 |
vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
|
1160 |
vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH |
1161 |
|
1162 |
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);
|
1163 |
} |
1164 |
} |
1165 |
|
1166 |
} |
1167 |
else if (vr->type==2) { |
1168 |
voffs=voffset; |
1169 |
|
1170 |
for(k=0;k<step;++k) { |
1171 |
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
|
1172 |
for(l=0;l<codebook.dimensions;++l, ++voffs) { |
1173 |
vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
|
1174 |
|
1175 |
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);
|
1176 |
} |
1177 |
} |
1178 |
} else {
|
1179 |
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
|
1180 |
return 1; |
1181 |
} |
1182 |
} |
1183 |
} |
1184 |
j_times_ptns_to_read+=ptns_to_read; |
1185 |
} |
1186 |
++partition_count; |
1187 |
voffset+=vr->partition_size; |
1188 |
} |
1189 |
} |
1190 |
} |
1191 |
return 0; |
1192 |
} |
1193 |
|
1194 |
// Decode the audio packet using the functions above
|
1195 |
#define BIAS 385 |
1196 |
|
1197 |
static int vorbis_parse_audio_packet(vorbis_context *vc) { |
1198 |
GetBitContext *gb=&vc->gb; |
1199 |
|
1200 |
uint_fast8_t previous_window=0,next_window=0; |
1201 |
uint_fast8_t mode_number; |
1202 |
uint_fast16_t blocksize; |
1203 |
int_fast32_t i,j; |
1204 |
uint_fast8_t no_residue[vc->audio_channels]; |
1205 |
uint_fast8_t do_not_decode[vc->audio_channels]; |
1206 |
vorbis_mapping *mapping; |
1207 |
float *ch_res_ptr=vc->channel_residues;
|
1208 |
float *ch_floor_ptr=vc->channel_floors;
|
1209 |
uint_fast8_t res_chan[vc->audio_channels]; |
1210 |
uint_fast8_t res_num=0;
|
1211 |
int_fast16_t retlen=0;
|
1212 |
uint_fast16_t saved_start=0;
|
1213 |
|
1214 |
if (get_bits1(gb)) {
|
1215 |
av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
|
1216 |
return -1; // packet type not audio |
1217 |
} |
1218 |
|
1219 |
if (vc->mode_count==1) { |
1220 |
mode_number=0;
|
1221 |
} else {
|
1222 |
mode_number=get_bits(gb, ilog(vc->mode_count-1));
|
1223 |
} |
1224 |
mapping=&vc->mappings[vc->modes[mode_number].mapping]; |
1225 |
|
1226 |
AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
|
1227 |
|
1228 |
if (vc->modes[mode_number].blockflag) {
|
1229 |
previous_window=get_bits1(gb); |
1230 |
next_window=get_bits1(gb); |
1231 |
} |
1232 |
|
1233 |
blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0; |
1234 |
memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ? |
1235 |
memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ? |
1236 |
|
1237 |
// Decode floor(1)
|
1238 |
|
1239 |
for(i=0;i<vc->audio_channels;++i) { |
1240 |
vorbis_floor *floor; |
1241 |
if (mapping->submaps>1) { |
1242 |
floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]]; |
1243 |
} else {
|
1244 |
floor=&vc->floors[mapping->submap_floor[0]];
|
1245 |
} |
1246 |
|
1247 |
no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr); |
1248 |
ch_floor_ptr+=blocksize/2;
|
1249 |
} |
1250 |
|
1251 |
// Nonzero vector propagate
|
1252 |
|
1253 |
for(i=mapping->coupling_steps-1;i>=0;--i) { |
1254 |
if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
|
1255 |
no_residue[mapping->magnitude[i]]=0;
|
1256 |
no_residue[mapping->angle[i]]=0;
|
1257 |
} |
1258 |
} |
1259 |
|
1260 |
// Decode residue
|
1261 |
|
1262 |
for(i=0;i<mapping->submaps;++i) { |
1263 |
vorbis_residue *residue; |
1264 |
uint_fast8_t ch=0;
|
1265 |
|
1266 |
for(j=0;j<vc->audio_channels;++j) { |
1267 |
if ((mapping->submaps==1) || (i=mapping->mux[j])) { |
1268 |
res_chan[j]=res_num; |
1269 |
if (no_residue[j]) {
|
1270 |
do_not_decode[ch]=1;
|
1271 |
} else {
|
1272 |
do_not_decode[ch]=0;
|
1273 |
} |
1274 |
++ch; |
1275 |
++res_num; |
1276 |
} |
1277 |
} |
1278 |
residue=&vc->residues[mapping->submap_residue[i]]; |
1279 |
vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
|
1280 |
|
1281 |
ch_res_ptr+=ch*blocksize/2;
|
1282 |
} |
1283 |
|
1284 |
// Inverse coupling
|
1285 |
|
1286 |
for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed |
1287 |
float *mag, *ang;
|
1288 |
|
1289 |
mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
|
1290 |
ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
|
1291 |
for(j=0;j<blocksize/2;++j) { |
1292 |
float temp;
|
1293 |
if (mag[j]>0.0) { |
1294 |
if (ang[j]>0.0) { |
1295 |
ang[j]=mag[j]-ang[j]; |
1296 |
} else {
|
1297 |
temp=ang[j]; |
1298 |
ang[j]=mag[j]; |
1299 |
mag[j]+=temp; |
1300 |
} |
1301 |
} else {
|
1302 |
if (ang[j]>0.0) { |
1303 |
ang[j]+=mag[j]; |
1304 |
} else {
|
1305 |
temp=ang[j]; |
1306 |
ang[j]=mag[j]; |
1307 |
mag[j]-=temp; |
1308 |
} |
1309 |
} |
1310 |
} |
1311 |
} |
1312 |
|
1313 |
// Dotproduct
|
1314 |
|
1315 |
for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) { |
1316 |
ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
|
1317 |
|
1318 |
for(i=0;i<blocksize/2;++i) { |
1319 |
ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
|
1320 |
} |
1321 |
} |
1322 |
|
1323 |
// MDCT, overlap/add, save data for next overlapping FPMATH
|
1324 |
|
1325 |
for(j=0;j<vc->audio_channels;++j) { |
1326 |
uint_fast8_t step=vc->audio_channels; |
1327 |
uint_fast16_t k; |
1328 |
float *saved=vc->saved+j*vc->blocksize_1/2; |
1329 |
float *ret=vc->ret;
|
1330 |
const float *lwin=vc->lwin; |
1331 |
const float *swin=vc->swin; |
1332 |
float *buf=vc->buf;
|
1333 |
float *buf_tmp=vc->buf_tmp;
|
1334 |
|
1335 |
ch_floor_ptr=vc->channel_floors+j*blocksize/2;
|
1336 |
|
1337 |
saved_start=vc->saved_start; |
1338 |
|
1339 |
ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp); |
1340 |
|
1341 |
if (vc->modes[mode_number].blockflag) {
|
1342 |
// -- overlap/add
|
1343 |
if (previous_window) {
|
1344 |
for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) { |
1345 |
ret[k]=saved[i]+buf[i]*lwin[i]+BIAS; |
1346 |
} |
1347 |
retlen=vc->blocksize_1/2;
|
1348 |
} else {
|
1349 |
buf += (vc->blocksize_1-vc->blocksize_0)/4;
|
1350 |
for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) { |
1351 |
ret[k]=saved[i]+buf[i]*swin[i]+BIAS; |
1352 |
} |
1353 |
buf += vc->blocksize_0/2;
|
1354 |
for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) { |
1355 |
ret[k]=buf[i]+BIAS; |
1356 |
} |
1357 |
buf=vc->buf; |
1358 |
retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4; |
1359 |
} |
1360 |
// -- save
|
1361 |
if (next_window) {
|
1362 |
buf += vc->blocksize_1/2;
|
1363 |
lwin += vc->blocksize_1/2-1; |
1364 |
for(i=0;i<vc->blocksize_1/2;++i) { |
1365 |
saved[i]=buf[i]*lwin[-i]; |
1366 |
} |
1367 |
saved_start=0;
|
1368 |
} else {
|
1369 |
saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
|
1370 |
buf += vc->blocksize_1/2;
|
1371 |
for(i=0;i<saved_start;++i) { |
1372 |
saved[i]=buf[i]; |
1373 |
} |
1374 |
swin += vc->blocksize_0/2-1; |
1375 |
for(i=0;i<vc->blocksize_0/2;++i) { |
1376 |
saved[saved_start+i]=buf[saved_start+i]*swin[-i]; |
1377 |
} |
1378 |
} |
1379 |
} else {
|
1380 |
// --overlap/add
|
1381 |
for(k=j, i=0;i<saved_start;++i, k+=step) { |
1382 |
ret[k]=saved[i]+BIAS; |
1383 |
} |
1384 |
for(i=0;i<vc->blocksize_0/2;++i, k+=step) { |
1385 |
ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS; |
1386 |
} |
1387 |
retlen=saved_start+vc->blocksize_0/2;
|
1388 |
// -- save
|
1389 |
buf += vc->blocksize_0/2;
|
1390 |
swin += vc->blocksize_0/2-1; |
1391 |
for(i=0;i<vc->blocksize_0/2;++i) { |
1392 |
saved[i]=buf[i]*swin[-i]; |
1393 |
} |
1394 |
saved_start=0;
|
1395 |
} |
1396 |
} |
1397 |
vc->saved_start=saved_start; |
1398 |
|
1399 |
return retlen*vc->audio_channels;
|
1400 |
} |
1401 |
|
1402 |
// Return the decoded audio packet through the standard api
|
1403 |
|
1404 |
static int vorbis_decode_frame(AVCodecContext *avccontext, |
1405 |
void *data, int *data_size, |
1406 |
uint8_t *buf, int buf_size)
|
1407 |
{ |
1408 |
vorbis_context *vc = avccontext->priv_data ; |
1409 |
GetBitContext *gb = &(vc->gb); |
1410 |
|
1411 |
int_fast16_t i, len; |
1412 |
|
1413 |
if(!buf_size){
|
1414 |
return 0; |
1415 |
} |
1416 |
|
1417 |
AV_DEBUG("packet length %d \n", buf_size);
|
1418 |
|
1419 |
init_get_bits(gb, buf, buf_size*8);
|
1420 |
|
1421 |
len=vorbis_parse_audio_packet(vc); |
1422 |
|
1423 |
if (len<=0) { |
1424 |
*data_size=0;
|
1425 |
return buf_size;
|
1426 |
} |
1427 |
|
1428 |
if (!vc->first_frame) {
|
1429 |
vc->first_frame=1;
|
1430 |
*data_size=0;
|
1431 |
return buf_size ;
|
1432 |
} |
1433 |
|
1434 |
AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len); |
1435 |
|
1436 |
for(i=0;i<len;++i) { |
1437 |
int_fast32_t tmp= ((int32_t*)vc->ret)[i]; |
1438 |
if(tmp & 0xf0000){ |
1439 |
// tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
|
1440 |
if(tmp > 0x43c0ffff) tmp= 0xFFFF; |
1441 |
else tmp= 0; |
1442 |
} |
1443 |
((int16_t*)data)[i]=tmp - 0x8000;
|
1444 |
} |
1445 |
|
1446 |
*data_size=len*2;
|
1447 |
|
1448 |
return buf_size ;
|
1449 |
} |
1450 |
|
1451 |
// Close decoder
|
1452 |
|
1453 |
static int vorbis_decode_close(AVCodecContext *avccontext) { |
1454 |
vorbis_context *vc = avccontext->priv_data; |
1455 |
|
1456 |
vorbis_free(vc); |
1457 |
|
1458 |
return 0 ; |
1459 |
} |
1460 |
|
1461 |
AVCodec vorbis_decoder = { |
1462 |
"vorbis",
|
1463 |
CODEC_TYPE_AUDIO, |
1464 |
CODEC_ID_VORBIS, |
1465 |
sizeof(vorbis_context),
|
1466 |
vorbis_decode_init, |
1467 |
NULL,
|
1468 |
vorbis_decode_close, |
1469 |
vorbis_decode_frame, |
1470 |
}; |
1471 |
|