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author | henry <henry@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2004-12-30 12:11:32 +0000 |
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committer | henry <henry@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2004-12-30 12:11:32 +0000 |
commit | fc91fed21ea71c50273c7c09f88e8d634c1e444e (patch) | |
tree | a4b1344270267c9d16eef135488049bd4e9a96f9 /tremor/synthesis.c | |
parent | dbbe18f4500c2707f2e9c0967c7b79312edecd3d (diff) | |
download | mpv-fc91fed21ea71c50273c7c09f88e8d634c1e444e.tar.bz2 mpv-fc91fed21ea71c50273c7c09f88e8d634c1e444e.tar.xz |
internal Tremor decoder for Ogg/Vorbis
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14281 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'tremor/synthesis.c')
-rw-r--r-- | tremor/synthesis.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/tremor/synthesis.c b/tremor/synthesis.c new file mode 100644 index 0000000000..988acea6fb --- /dev/null +++ b/tremor/synthesis.c @@ -0,0 +1,102 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * + * * + * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * + * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * + * ALL REDISTRIBUTION RIGHTS RESERVED. * + * * + ******************************************************************** + + function: single-block PCM synthesis + last mod: $Id$ + + ********************************************************************/ + +#include <stdio.h> +#include "ogg.h" +#include "ivorbiscodec.h" +#include "codec_internal.h" +#include "registry.h" +#include "misc.h" +#include "os.h" + +int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){ + vorbis_dsp_state *vd=vb->vd; + backend_lookup_state *b=(backend_lookup_state *)vd->backend_state; + vorbis_info *vi=vd->vi; + codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; + oggpack_buffer *opb=&vb->opb; + int type,mode,i; + + /* first things first. Make sure decode is ready */ + _vorbis_block_ripcord(vb); + oggpack_readinit(opb,op->packet,op->bytes); + + /* Check the packet type */ + if(oggpack_read(opb,1)!=0){ + /* Oops. This is not an audio data packet */ + return(OV_ENOTAUDIO); + } + + /* read our mode and pre/post windowsize */ + mode=oggpack_read(opb,b->modebits); + if(mode==-1)return(OV_EBADPACKET); + + vb->mode=mode; + vb->W=ci->mode_param[mode]->blockflag; + if(vb->W){ + vb->lW=oggpack_read(opb,1); + vb->nW=oggpack_read(opb,1); + if(vb->nW==-1) return(OV_EBADPACKET); + }else{ + vb->lW=0; + vb->nW=0; + } + + /* more setup */ + vb->granulepos=op->granulepos; + vb->sequence=op->packetno-3; /* first block is third packet */ + vb->eofflag=op->e_o_s; + + /* alloc pcm passback storage */ + vb->pcmend=ci->blocksizes[vb->W]; + vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); + for(i=0;i<vi->channels;i++) + vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); + + /* unpack_header enforces range checking */ + type=ci->map_type[ci->mode_param[mode]->mapping]; + + return(_mapping_P[type]->inverse(vb,b->mode[mode])); +} + +long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ + codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; + oggpack_buffer opb; + int mode; + + oggpack_readinit(&opb,op->packet,op->bytes); + + /* Check the packet type */ + if(oggpack_read(&opb,1)!=0){ + /* Oops. This is not an audio data packet */ + return(OV_ENOTAUDIO); + } + + { + int modebits=0; + int v=ci->modes; + while(v>1){ + modebits++; + v>>=1; + } + + /* read our mode and pre/post windowsize */ + mode=oggpack_read(&opb,modebits); + } + if(mode==-1)return(OV_EBADPACKET); + return(ci->blocksizes[ci->mode_param[mode]->blockflag]); +} + + |