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536b48b258
Simplification: I have to reconsider this trees and forest thing... Also readded and documented the check i had in the beginning and removed before applying. It avoids a possible div by zero. Originally committed as revision 4934 to svn://svn.ffmpeg.org/ffmpeg/trunk
1707 lines
59 KiB
C
1707 lines
59 KiB
C
/**
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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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static 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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#define BARK(x) \
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(13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
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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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if(vc->floors[i].floor_type==0) {
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av_free(vc->floors[i].data.t0.map);
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av_free(vc->floors[i].data.t0.book_list);
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av_free(vc->floors[i].data.t0.lsp);
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}
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else {
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av_free(vc->floors[i].data.t1.x_list);
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av_free(vc->floors[i].data.t1.x_list_order);
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av_free(vc->floors[i].data.t1.low_neighbour);
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av_free(vc->floors[i].data.t1.high_neighbour);
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}
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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);
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uint_fast16_t codebook_multiplicands[codebook_lookup_values];
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float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
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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;
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uint_fast8_t codebook_sequence_p=get_bits1(gb);
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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) {
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codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
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AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
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AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
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}
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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));
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for(j=0, i=0;i<entries;++i) {
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uint_fast8_t dim=codebook_setup->dimensions;
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if (tmp_vlc_bits[i]) {
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float last=0.0;
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uint_fast32_t lookup_offset=i;
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
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#endif
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for(k=0;k<dim;++k) {
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uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
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codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
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if (codebook_sequence_p) {
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last=codebook_setup->codevectors[j*dim+k];
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}
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lookup_offset/=codebook_lookup_values;
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}
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tmp_vlc_bits[j]=tmp_vlc_bits[i];
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#ifdef V_DEBUG
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av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
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for(k=0;k<dim;++k) {
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av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
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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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++j;
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}
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}
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if (j!=used_entries) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
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goto error;
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}
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entries=used_entries;
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}
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else if (codebook_setup->lookup_type>=2) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
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goto error;
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}
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// Initialize VLC table
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if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
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av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
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goto error;
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}
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codebook_setup->maxdepth=0;
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for(t=0;t<entries;++t)
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if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
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if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
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else codebook_setup->nb_bits=V_NB_BITS;
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codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
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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)) {
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av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
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goto error;
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}
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}
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av_free(tmp_vlc_bits);
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av_free(tmp_vlc_codes);
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return 0;
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// Error:
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error:
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av_free(tmp_vlc_bits);
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av_free(tmp_vlc_codes);
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return 1;
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}
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// Process time domain transforms part (unused in Vorbis I)
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static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
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GetBitContext *gb=&vc->gb;
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uint_fast8_t i;
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uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
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for(i=0;i<vorbis_time_count;++i) {
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uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
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AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
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if (vorbis_tdtransform) {
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av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
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return 1;
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}
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}
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return 0;
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}
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// Process floors part
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static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
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vorbis_floor_data *vfu, float *vec);
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static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
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vorbis_floor_data *vfu, float *vec);
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static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
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GetBitContext *gb=&vc->gb;
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uint_fast16_t i,j,k;
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vc->floor_count=get_bits(gb, 6)+1;
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vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
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for (i=0;i<vc->floor_count;++i) {
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vorbis_floor *floor_setup=&vc->floors[i];
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floor_setup->floor_type=get_bits(gb, 16);
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AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
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if (floor_setup->floor_type==1) {
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uint_fast8_t maximum_class=0;
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uint_fast8_t rangebits;
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uint_fast16_t floor1_values=2;
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floor_setup->decode=vorbis_floor1_decode;
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floor_setup->data.t1.partitions=get_bits(gb, 5);
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AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
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|
|
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]=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.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
|
|
floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
|
|
floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
|
|
floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
|
|
|
|
|
|
rangebits=get_bits(gb, 4);
|
|
floor_setup->data.t1.x_list[0] = 0;
|
|
floor_setup->data.t1.x_list[1] = (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.x_list[floor1_values]=get_bits(gb, rangebits);
|
|
|
|
AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
|
|
}
|
|
}
|
|
|
|
// Precalculate order of x coordinates - needed for decode
|
|
|
|
for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
|
|
floor_setup->data.t1.x_list_order[k]=k;
|
|
}
|
|
|
|
for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) { // FIXME optimize sorting ?
|
|
for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
|
|
if(floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[k]]>floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[j]]) {
|
|
uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
|
|
floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
|
|
floor_setup->data.t1.x_list_order[j]=tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Precalculate low and high neighbours
|
|
|
|
for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
|
|
floor_setup->data.t1.low_neighbour[k]=0;
|
|
floor_setup->data.t1.high_neighbour[k]=1; // correct according to SPEC requirements
|
|
|
|
for (j=0;j<k;++j) {
|
|
if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
|
|
(floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
|
|
floor_setup->data.t1.low_neighbour[k]=j;
|
|
}
|
|
if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
|
|
(floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
|
|
floor_setup->data.t1.high_neighbour[k]=j;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* 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 mode_number )
|
|
{
|
|
vorbis_floor * floors=vc->floors;
|
|
vorbis_floor0 * vf;
|
|
int idx;
|
|
int_fast32_t * map;
|
|
int_fast32_t n; //TODO: could theoretically be smaller?
|
|
|
|
n=(vc->modes[mode_number].blockflag ?
|
|
vc->blocksize_1 : vc->blocksize_0) / 2;
|
|
floors[mode_number].data.t0.map=
|
|
av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
|
|
|
|
map=floors[mode_number].data.t0.map;
|
|
vf=&floors[mode_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=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);
|
|
|
|
if (vc->floors[i].floor_type == 0) { create_map( vc, i ); }
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Process the whole setup header using the functions above
|
|
|
|
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
|
|
GetBitContext *gb=&vc->gb;
|
|
|
|
if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
|
|
(get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
|
|
(get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
|
|
return 1;
|
|
}
|
|
|
|
if (vorbis_parse_setup_hdr_codebooks(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
|
|
return 2;
|
|
}
|
|
if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
|
|
return 3;
|
|
}
|
|
if (vorbis_parse_setup_hdr_floors(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
|
|
return 4;
|
|
}
|
|
if (vorbis_parse_setup_hdr_residues(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
|
|
return 5;
|
|
}
|
|
if (vorbis_parse_setup_hdr_mappings(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
|
|
return 6;
|
|
}
|
|
if (vorbis_parse_setup_hdr_modes(vc)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
|
|
return 7;
|
|
}
|
|
if (!get_bits1(gb)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
|
|
return 8; // framing flag bit unset error
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Process the identification header
|
|
|
|
static int vorbis_parse_id_hdr(vorbis_context *vc){
|
|
GetBitContext *gb=&vc->gb;
|
|
uint_fast8_t bl0, bl1;
|
|
const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
|
|
|
|
if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
|
|
(get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
|
|
(get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
|
|
return 1;
|
|
}
|
|
|
|
vc->version=get_bits_long_le(gb, 32); //FIXME check 0
|
|
vc->audio_channels=get_bits(gb, 8); //FIXME check >0
|
|
vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0
|
|
vc->bitrate_maximum=get_bits_long_le(gb, 32);
|
|
vc->bitrate_nominal=get_bits_long_le(gb, 32);
|
|
vc->bitrate_minimum=get_bits_long_le(gb, 32);
|
|
bl0=get_bits(gb, 4);
|
|
bl1=get_bits(gb, 4);
|
|
vc->blocksize_0=(1<<bl0);
|
|
vc->blocksize_1=(1<<bl1);
|
|
if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
|
|
return 3;
|
|
}
|
|
vc->swin=vwin[bl0-6];
|
|
vc->lwin=vwin[bl1-6];
|
|
|
|
if ((get_bits1(gb)) == 0) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
|
|
return 2;
|
|
}
|
|
|
|
vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
|
|
vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
|
|
vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
|
|
vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
|
|
vc->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->mdct0, bl0, 1);
|
|
ff_mdct_init(&vc->mdct1, bl1, 1);
|
|
|
|
AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
|
|
vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
|
|
|
|
/*
|
|
BLK=vc->blocksize_0;
|
|
for(i=0;i<BLK/2;++i) {
|
|
vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
|
|
}
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Process the extradata using the functions above (identification header, setup header)
|
|
|
|
static int vorbis_decode_init(AVCodecContext *avccontext) {
|
|
vorbis_context *vc = avccontext->priv_data ;
|
|
uint8_t *headers = avccontext->extradata;
|
|
int headers_len=avccontext->extradata_size;
|
|
uint8_t *header_start[3];
|
|
int header_len[3];
|
|
GetBitContext *gb = &(vc->gb);
|
|
int i, j, hdr_type;
|
|
|
|
vc->avccontext = avccontext;
|
|
|
|
if (!headers_len) {
|
|
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
|
|
return -1;
|
|
}
|
|
|
|
if(headers[0] == 0 && headers[1] == 30) {
|
|
for(i = 0; i < 3; i++){
|
|
header_len[i] = *headers++ << 8;
|
|
header_len[i] += *headers++;
|
|
header_start[i] = headers;
|
|
headers += header_len[i];
|
|
}
|
|
} else if(headers[0] == 2) {
|
|
for(j=1,i=0;i<2;++i, ++j) {
|
|
header_len[i]=0;
|
|
while(j<headers_len && headers[j]==0xff) {
|
|
header_len[i]+=0xff;
|
|
++j;
|
|
}
|
|
if (j>=headers_len) {
|
|
av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
|
|
return -1;
|
|
}
|
|
header_len[i]+=headers[j];
|
|
}
|
|
header_len[2]=headers_len-header_len[0]-header_len[1]-j;
|
|
headers+=j;
|
|
header_start[0] = headers;
|
|
header_start[1] = header_start[0] + header_len[0];
|
|
header_start[2] = header_start[1] + header_len[1];
|
|
} else {
|
|
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;
|
|
|
|
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) {
|
|
int j, iter_cond=vf->map[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[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];
|
|
uint_fast8_t floor1_flag[vf->x_list_dim];
|
|
uint_fast8_t class_;
|
|
uint_fast8_t cdim;
|
|
uint_fast8_t cbits;
|
|
uint_fast8_t csub;
|
|
uint_fast8_t cval;
|
|
int_fast16_t book;
|
|
uint_fast16_t offset;
|
|
uint_fast16_t i,j;
|
|
uint_fast16_t *floor_x_sort=vf->x_list_order;
|
|
/*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
|
|
int_fast16_t dy, err;
|
|
uint_fast16_t lx,hx, ly, hy=0;
|
|
|
|
|
|
if (!get_bits1(gb)) return 1; // silence
|
|
|
|
// Read values (or differences) for the floor's points
|
|
|
|
floor1_Y[0]=get_bits(gb, ilog(range-1));
|
|
floor1_Y[1]=get_bits(gb, ilog(range-1));
|
|
|
|
AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
|
|
|
|
offset=2;
|
|
for(i=0;i<vf->partitions;++i) {
|
|
class_=vf->partition_class[i];
|
|
cdim=vf->class_dimensions[class_];
|
|
cbits=vf->class_subclasses[class_];
|
|
csub=(1<<cbits)-1;
|
|
cval=0;
|
|
|
|
AV_DEBUG("Cbits %d \n", cbits);
|
|
|
|
if (cbits) { // this reads all subclasses for this partition's class
|
|
cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
|
|
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>0) {
|
|
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->x_list[offset+j], floor1_Y[offset+j]);
|
|
}
|
|
offset+=cdim;
|
|
}
|
|
|
|
// Amplitude calculation from the differences
|
|
|
|
floor1_flag[0]=1;
|
|
floor1_flag[1]=1;
|
|
floor1_Y_final[0]=floor1_Y[0];
|
|
floor1_Y_final[1]=floor1_Y[1];
|
|
|
|
for(i=2;i<vf->x_list_dim;++i) {
|
|
uint_fast16_t val, highroom, lowroom, room;
|
|
uint_fast16_t high_neigh_offs;
|
|
uint_fast16_t low_neigh_offs;
|
|
|
|
low_neigh_offs=vf->low_neighbour[i];
|
|
high_neigh_offs=vf->high_neighbour[i];
|
|
dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
|
|
adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
|
|
ady= ABS(dy);
|
|
err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
|
|
off=err/adx;
|
|
if (dy<0) {
|
|
predicted=floor1_Y_final[low_neigh_offs]-off;
|
|
} else {
|
|
predicted=floor1_Y_final[low_neigh_offs]+off;
|
|
} // render_point end
|
|
|
|
val=floor1_Y[i];
|
|
highroom=range-predicted;
|
|
lowroom=predicted;
|
|
if (highroom < lowroom) {
|
|
room=highroom*2;
|
|
} else {
|
|
room=lowroom*2; // SPEC mispelling
|
|
}
|
|
if (val) {
|
|
floor1_flag[low_neigh_offs]=1;
|
|
floor1_flag[high_neigh_offs]=1;
|
|
floor1_flag[i]=1;
|
|
if (val>=room) {
|
|
if (highroom > lowroom) {
|
|
floor1_Y_final[i]=val-lowroom+predicted;
|
|
} else {
|
|
floor1_Y_final[i]=predicted-val+highroom-1;
|
|
}
|
|
} else {
|
|
if (val & 1) {
|
|
floor1_Y_final[i]=predicted-(val+1)/2;
|
|
} else {
|
|
floor1_Y_final[i]=predicted+val/2;
|
|
}
|
|
}
|
|
} else {
|
|
floor1_flag[i]=0;
|
|
floor1_Y_final[i]=predicted;
|
|
}
|
|
|
|
AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
|
|
}
|
|
|
|
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
|
|
|
|
hx=0;
|
|
lx=0;
|
|
ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC
|
|
|
|
vec[0]=floor1_inverse_db_table[ly];
|
|
|
|
for(i=1;i<vf->x_list_dim;++i) {
|
|
AV_DEBUG(" Looking at post %d \n", i);
|
|
|
|
if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled
|
|
int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
|
|
|
|
hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
|
|
hx=vf->x_list[floor_x_sort[i]];
|
|
|
|
dy=hy-ly;
|
|
adx=hx-lx;
|
|
ady= (dy<0) ? -dy:dy;//ABS(dy);
|
|
base=dy/adx;
|
|
|
|
AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
|
|
|
|
x=lx;
|
|
y=ly;
|
|
err=0;
|
|
if (dy<0) {
|
|
sy=base-1;
|
|
} else {
|
|
sy=base+1;
|
|
}
|
|
ady=ady-(base<0 ? -base : base)*adx;
|
|
vec[x]=floor1_inverse_db_table[y];
|
|
|
|
AV_DEBUG(" vec[ %d ] = %d \n", x, y);
|
|
|
|
for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
|
|
err+=ady;
|
|
if (err>=adx) {
|
|
err-=adx;
|
|
y+=sy;
|
|
} else {
|
|
y+=base;
|
|
}
|
|
vec[x]=floor1_inverse_db_table[y];
|
|
|
|
AV_DEBUG(" vec[ %d ] = %d \n", x, y);
|
|
}
|
|
|
|
/* for(j=1;j<hx-lx+1;++j) { // iterating render_point
|
|
dy=hy-ly;
|
|
adx=hx-lx;
|
|
ady= dy<0 ? -dy : dy;
|
|
err=ady*j;
|
|
off=err/adx;
|
|
if (dy<0) {
|
|
predicted=ly-off;
|
|
} else {
|
|
predicted=ly+off;
|
|
}
|
|
if (lx+j < vf->x_list[1]) {
|
|
vec[lx+j]=floor1_inverse_db_table[predicted];
|
|
}
|
|
}*/
|
|
|
|
lx=hx;
|
|
ly=hy;
|
|
}
|
|
}
|
|
|
|
if (hx<vf->x_list[1]) {
|
|
for(i=hx;i<vf->x_list[1];++i) {
|
|
vec[i]=floor1_inverse_db_table[hy];
|
|
}
|
|
}
|
|
|
|
AV_DEBUG(" Floor decoded\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Read and decode residue
|
|
|
|
static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
|
|
GetBitContext *gb=&vc->gb;
|
|
uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
|
|
uint_fast16_t n_to_read=vr->end-vr->begin;
|
|
uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
|
|
uint_fast8_t classifs[ptns_to_read*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) {
|
|
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 && vr->classifications<256 && temp<=65536); //needed for inverse[]
|
|
for(i=0;i<c_p_c;++i) {
|
|
uint_fast32_t temp2;
|
|
|
|
temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
|
|
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;
|
|
uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
|
|
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) * codebook.dimensions;
|
|
for(l=0;l<codebook.dimensions;++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) * codebook.dimensions;
|
|
for(l=0;l<codebook.dimensions;++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 && (codebook.dimensions&1)==0) { // most frequent case optimized
|
|
voffs=voffset>>1;
|
|
|
|
for(k=0;k<step;++k) {
|
|
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
|
|
for(l=0;l<codebook.dimensions;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) * codebook.dimensions;
|
|
for(l=0;l<codebook.dimensions;++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;
|
|
}
|
|
|
|
// Decode the audio packet using the functions above
|
|
#define BIAS 385
|
|
|
|
static int vorbis_parse_audio_packet(vorbis_context *vc) {
|
|
GetBitContext *gb=&vc->gb;
|
|
|
|
uint_fast8_t previous_window=0,next_window=0;
|
|
uint_fast8_t mode_number;
|
|
uint_fast16_t blocksize;
|
|
int_fast32_t i,j;
|
|
uint_fast8_t no_residue[vc->audio_channels];
|
|
uint_fast8_t do_not_decode[vc->audio_channels];
|
|
vorbis_mapping *mapping;
|
|
float *ch_res_ptr=vc->channel_residues;
|
|
float *ch_floor_ptr=vc->channel_floors;
|
|
uint_fast8_t res_chan[vc->audio_channels];
|
|
uint_fast8_t res_num=0;
|
|
int_fast16_t retlen=0;
|
|
uint_fast16_t saved_start=0;
|
|
|
|
if (get_bits1(gb)) {
|
|
av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
|
|
return -1; // packet type not audio
|
|
}
|
|
|
|
if (vc->mode_count==1) {
|
|
mode_number=0;
|
|
} else {
|
|
mode_number=get_bits(gb, ilog(vc->mode_count-1));
|
|
}
|
|
mapping=&vc->mappings[vc->modes[mode_number].mapping];
|
|
|
|
AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
|
|
|
|
if (vc->modes[mode_number].blockflag) {
|
|
previous_window=get_bits1(gb);
|
|
next_window=get_bits1(gb);
|
|
}
|
|
|
|
blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
|
|
memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
|
|
memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
|
|
|
|
// Decode floor
|
|
|
|
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;
|
|
for(j=0;j<blocksize/2;++j) {
|
|
float temp;
|
|
if (mag[j]>0.0) {
|
|
if (ang[j]>0.0) {
|
|
ang[j]=mag[j]-ang[j];
|
|
} else {
|
|
temp=ang[j];
|
|
ang[j]=mag[j];
|
|
mag[j]+=temp;
|
|
}
|
|
} else {
|
|
if (ang[j]>0.0) {
|
|
ang[j]+=mag[j];
|
|
} else {
|
|
temp=ang[j];
|
|
ang[j]=mag[j];
|
|
mag[j]-=temp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Dotproduct
|
|
|
|
for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
|
|
ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
|
|
|
|
for(i=0;i<blocksize/2;++i) {
|
|
ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
|
|
}
|
|
}
|
|
|
|
// MDCT, overlap/add, save data for next overlapping FPMATH
|
|
|
|
for(j=0;j<vc->audio_channels;++j) {
|
|
uint_fast8_t step=vc->audio_channels;
|
|
uint_fast16_t k;
|
|
float *saved=vc->saved+j*vc->blocksize_1/2;
|
|
float *ret=vc->ret;
|
|
const float *lwin=vc->lwin;
|
|
const float *swin=vc->swin;
|
|
float *buf=vc->buf;
|
|
float *buf_tmp=vc->buf_tmp;
|
|
|
|
ch_floor_ptr=vc->channel_floors+j*blocksize/2;
|
|
|
|
saved_start=vc->saved_start;
|
|
|
|
ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
|
|
|
|
if (vc->modes[mode_number].blockflag) {
|
|
// -- overlap/add
|
|
if (previous_window) {
|
|
for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
|
|
ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
|
|
}
|
|
retlen=vc->blocksize_1/2;
|
|
} else {
|
|
buf += (vc->blocksize_1-vc->blocksize_0)/4;
|
|
for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
|
|
ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
|
|
}
|
|
buf += vc->blocksize_0/2;
|
|
for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
|
|
ret[k]=buf[i]+BIAS;
|
|
}
|
|
buf=vc->buf;
|
|
retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
|
|
}
|
|
// -- save
|
|
if (next_window) {
|
|
buf += vc->blocksize_1/2;
|
|
lwin += vc->blocksize_1/2-1;
|
|
for(i=0;i<vc->blocksize_1/2;++i) {
|
|
saved[i]=buf[i]*lwin[-i];
|
|
}
|
|
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) {
|
|
saved[i]=buf[i];
|
|
}
|
|
swin += vc->blocksize_0/2-1;
|
|
for(i=0;i<vc->blocksize_0/2;++i) {
|
|
saved[saved_start+i]=buf[saved_start+i]*swin[-i];
|
|
}
|
|
}
|
|
} else {
|
|
// --overlap/add
|
|
for(k=j, i=0;i<saved_start;++i, k+=step) {
|
|
ret[k]=saved[i]+BIAS;
|
|
}
|
|
for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
|
|
ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
|
|
}
|
|
retlen=saved_start+vc->blocksize_0/2;
|
|
// -- save
|
|
buf += vc->blocksize_0/2;
|
|
swin += vc->blocksize_0/2-1;
|
|
for(i=0;i<vc->blocksize_0/2;++i) {
|
|
saved[i]=buf[i]*swin[-i];
|
|
}
|
|
saved_start=0;
|
|
}
|
|
}
|
|
vc->saved_start=saved_start;
|
|
|
|
return retlen*vc->audio_channels;
|
|
}
|
|
|
|
// Return the decoded audio packet through the standard api
|
|
|
|
static int vorbis_decode_frame(AVCodecContext *avccontext,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
vorbis_context *vc = avccontext->priv_data ;
|
|
GetBitContext *gb = &(vc->gb);
|
|
|
|
int_fast16_t i, len;
|
|
|
|
if(!buf_size){
|
|
return 0;
|
|
}
|
|
|
|
AV_DEBUG("packet length %d \n", buf_size);
|
|
|
|
init_get_bits(gb, buf, buf_size*8);
|
|
|
|
len=vorbis_parse_audio_packet(vc);
|
|
|
|
if (len<=0) {
|
|
*data_size=0;
|
|
return buf_size;
|
|
}
|
|
|
|
if (!vc->first_frame) {
|
|
vc->first_frame=1;
|
|
*data_size=0;
|
|
return buf_size ;
|
|
}
|
|
|
|
AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
|
|
|
|
for(i=0;i<len;++i) {
|
|
int_fast32_t tmp= ((int32_t*)vc->ret)[i];
|
|
if(tmp & 0xf0000){
|
|
// tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
|
|
if(tmp > 0x43c0ffff) tmp= 0xFFFF;
|
|
else tmp= 0;
|
|
}
|
|
((int16_t*)data)[i]=tmp - 0x8000;
|
|
}
|
|
|
|
*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,
|
|
};
|
|
|