subs: change subdelay handling and vobsub timing
[mplayer/glamo.git] / tremor / synthesis.c
blob499111e363493fde40b7a0c75b6e43eb01668b5b
1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
4 * *
5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * *
9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
11 * *
12 ********************************************************************
14 function: single-block PCM synthesis
15 last mod: $Id$
17 ********************************************************************/
19 #include <stdio.h>
20 #include "ogg.h"
21 #include "ivorbiscodec.h"
22 #include "codec_internal.h"
23 #include "registry.h"
24 #include "misc.h"
25 #include "os.h"
26 #include "block.h"
28 int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){
29 vorbis_dsp_state *vd=vb->vd;
30 backend_lookup_state *b=(backend_lookup_state *)vd->backend_state;
31 vorbis_info *vi=vd->vi;
32 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
33 oggpack_buffer *opb=&vb->opb;
34 int type,mode,i;
36 /* first things first. Make sure decode is ready */
37 _vorbis_block_ripcord(vb);
38 oggpack_readinit(opb,op->packet,op->bytes);
40 /* Check the packet type */
41 if(oggpack_read(opb,1)!=0){
42 /* Oops. This is not an audio data packet */
43 return(OV_ENOTAUDIO);
46 /* read our mode and pre/post windowsize */
47 mode=oggpack_read(opb,b->modebits);
48 if(mode==-1)return(OV_EBADPACKET);
50 vb->mode=mode;
51 vb->W=ci->mode_param[mode]->blockflag;
52 if(vb->W){
53 vb->lW=oggpack_read(opb,1);
54 vb->nW=oggpack_read(opb,1);
55 if(vb->nW==-1) return(OV_EBADPACKET);
56 }else{
57 vb->lW=0;
58 vb->nW=0;
61 /* more setup */
62 vb->granulepos=op->granulepos;
63 vb->sequence=op->packetno-3; /* first block is third packet */
64 vb->eofflag=op->e_o_s;
66 /* alloc pcm passback storage */
67 vb->pcmend=ci->blocksizes[vb->W];
68 vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
69 for(i=0;i<vi->channels;i++)
70 vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i]));
72 /* unpack_header enforces range checking */
73 type=ci->map_type[ci->mode_param[mode]->mapping];
75 return(_mapping_P[type]->inverse(vb,b->mode[mode]));
78 long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
79 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
80 oggpack_buffer opb;
81 int mode;
83 oggpack_readinit(&opb,op->packet,op->bytes);
85 /* Check the packet type */
86 if(oggpack_read(&opb,1)!=0){
87 /* Oops. This is not an audio data packet */
88 return(OV_ENOTAUDIO);
92 int modebits=0;
93 int v=ci->modes;
94 while(v>1){
95 modebits++;
96 v>>=1;
99 /* read our mode and pre/post windowsize */
100 mode=oggpack_read(&opb,modebits);
102 if(mode==-1)return(OV_EBADPACKET);
103 return(ci->blocksizes[ci->mode_param[mode]->blockflag]);