1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libtremor/lib/tremor_synthesis.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,131 @@
1.4 +/********************************************************************
1.5 + * *
1.6 + * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
1.7 + * *
1.8 + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
1.9 + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
1.10 + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
1.11 + * *
1.12 + * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
1.13 + * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
1.14 + * *
1.15 + ********************************************************************
1.16 +
1.17 + function: single-block PCM synthesis
1.18 + last mod: $Id: synthesis.c,v 1.4 2003/03/29 03:07:21 xiphmont Exp $
1.19 +
1.20 + ********************************************************************/
1.21 +
1.22 +#include <stdio.h>
1.23 +#include <ogg/ogg.h>
1.24 +#include "ivorbiscodec.h"
1.25 +#include "codec_internal.h"
1.26 +#include "registry.h"
1.27 +#include "misc.h"
1.28 +#include "block.h"
1.29 +
1.30 +static int _vorbis_synthesis1(vorbis_block *vb,ogg_packet *op,int decodep){
1.31 + vorbis_dsp_state *vd= vb ? vb->vd : 0;
1.32 + private_state *b= vd ? (private_state *)vd->backend_state: 0;
1.33 + vorbis_info *vi= vd ? vd->vi : 0;
1.34 + codec_setup_info *ci= vi ? (codec_setup_info *)vi->codec_setup : 0;
1.35 + oggpack_buffer *opb=vb ? &vb->opb : 0;
1.36 + int type,mode,i;
1.37 +
1.38 + if (!vd || !b || !vi || !ci || !opb) {
1.39 + return OV_EBADPACKET;
1.40 + }
1.41 +
1.42 + /* first things first. Make sure decode is ready */
1.43 + _vorbis_block_ripcord(vb);
1.44 + oggpack_readinit(opb,op->packet,op->bytes);
1.45 +
1.46 + /* Check the packet type */
1.47 + if(oggpack_read(opb,1)!=0){
1.48 + /* Oops. This is not an audio data packet */
1.49 + return(OV_ENOTAUDIO);
1.50 + }
1.51 +
1.52 + /* read our mode and pre/post windowsize */
1.53 + mode=oggpack_read(opb,b->modebits);
1.54 + if(mode==-1)return(OV_EBADPACKET);
1.55 +
1.56 + vb->mode=mode;
1.57 + if(!ci->mode_param[mode]){
1.58 + return(OV_EBADPACKET);
1.59 + }
1.60 +
1.61 + vb->W=ci->mode_param[mode]->blockflag;
1.62 + if(vb->W){
1.63 + vb->lW=oggpack_read(opb,1);
1.64 + vb->nW=oggpack_read(opb,1);
1.65 + if(vb->nW==-1) return(OV_EBADPACKET);
1.66 + }else{
1.67 + vb->lW=0;
1.68 + vb->nW=0;
1.69 + }
1.70 +
1.71 + /* more setup */
1.72 + vb->granulepos=op->granulepos;
1.73 + vb->sequence=op->packetno-3; /* first block is third packet */
1.74 + vb->eofflag=op->e_o_s;
1.75 +
1.76 + if(decodep){
1.77 + /* alloc pcm passback storage */
1.78 + vb->pcmend=ci->blocksizes[vb->W];
1.79 + vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
1.80 + for(i=0;i<vi->channels;i++)
1.81 + vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i]));
1.82 +
1.83 + /* unpack_header enforces range checking */
1.84 + type=ci->map_type[ci->mode_param[mode]->mapping];
1.85 +
1.86 + return(_mapping_P[type]->inverse(vb,b->mode[mode]));
1.87 + }else{
1.88 + /* no pcm */
1.89 + vb->pcmend=0;
1.90 + vb->pcm=NULL;
1.91 +
1.92 + return(0);
1.93 + }
1.94 +}
1.95 +
1.96 +int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){
1.97 + return _vorbis_synthesis1(vb,op,1);
1.98 +}
1.99 +
1.100 +/* used to track pcm position without actually performing decode.
1.101 + Useful for sequential 'fast forward' */
1.102 +int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){
1.103 + return _vorbis_synthesis1(vb,op,0);
1.104 +}
1.105 +
1.106 +long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
1.107 + codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
1.108 + oggpack_buffer opb;
1.109 + int mode;
1.110 +
1.111 + oggpack_readinit(&opb,op->packet,op->bytes);
1.112 +
1.113 + /* Check the packet type */
1.114 + if(oggpack_read(&opb,1)!=0){
1.115 + /* Oops. This is not an audio data packet */
1.116 + return(OV_ENOTAUDIO);
1.117 + }
1.118 +
1.119 + {
1.120 + int modebits=0;
1.121 + int v=ci->modes;
1.122 + while(v>1){
1.123 + modebits++;
1.124 + v>>=1;
1.125 + }
1.126 +
1.127 + /* read our mode and pre/post windowsize */
1.128 + mode=oggpack_read(&opb,modebits);
1.129 + }
1.130 + if(mode==-1)return(OV_EBADPACKET);
1.131 + return(ci->blocksizes[ci->mode_param[mode]->blockflag]);
1.132 +}
1.133 +
1.134 +
