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media/libtremor/lib/tremor_synthesis.c@b8a032363ba2 (annotated)

media/libtremor/lib/tremor_synthesis.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/********************************************************************
michael@0	2	* *
michael@0	3	* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
michael@0	4	* *
michael@0	5	* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
michael@0	6	* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0	7	* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
michael@0	8	* *
michael@0	9	* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
michael@0	10	* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
michael@0	11	* *
michael@0	12	********************************************************************
michael@0	13
michael@0	14	function: single-block PCM synthesis
michael@0	15	last mod: $Id: synthesis.c,v 1.4 2003/03/29 03:07:21 xiphmont Exp $
michael@0	16
michael@0	17	********************************************************************/
michael@0	18
michael@0	19	#include <stdio.h>
michael@0	20	#include <ogg/ogg.h>
michael@0	21	#include "ivorbiscodec.h"
michael@0	22	#include "codec_internal.h"
michael@0	23	#include "registry.h"
michael@0	24	#include "misc.h"
michael@0	25	#include "block.h"
michael@0	26
michael@0	27	static int _vorbis_synthesis1(vorbis_block *vb,ogg_packet *op,int decodep){
michael@0	28	vorbis_dsp_state *vd= vb ? vb->vd : 0;
michael@0	29	private_state *b= vd ? (private_state *)vd->backend_state: 0;
michael@0	30	vorbis_info *vi= vd ? vd->vi : 0;
michael@0	31	codec_setup_info *ci= vi ? (codec_setup_info *)vi->codec_setup : 0;
michael@0	32	oggpack_buffer *opb=vb ? &vb->opb : 0;
michael@0	33	int type,mode,i;
michael@0	34
michael@0	35	if (!vd || !b || !vi || !ci || !opb) {
michael@0	36	return OV_EBADPACKET;
michael@0	37	}
michael@0	38
michael@0	39	/* first things first. Make sure decode is ready */
michael@0	40	_vorbis_block_ripcord(vb);
michael@0	41	oggpack_readinit(opb,op->packet,op->bytes);
michael@0	42
michael@0	43	/* Check the packet type */
michael@0	44	if(oggpack_read(opb,1)!=0){
michael@0	45	/* Oops. This is not an audio data packet */
michael@0	46	return(OV_ENOTAUDIO);
michael@0	47	}
michael@0	48
michael@0	49	/* read our mode and pre/post windowsize */
michael@0	50	mode=oggpack_read(opb,b->modebits);
michael@0	51	if(mode==-1)return(OV_EBADPACKET);
michael@0	52
michael@0	53	vb->mode=mode;
michael@0	54	if(!ci->mode_param[mode]){
michael@0	55	return(OV_EBADPACKET);
michael@0	56	}
michael@0	57
michael@0	58	vb->W=ci->mode_param[mode]->blockflag;
michael@0	59	if(vb->W){
michael@0	60	vb->lW=oggpack_read(opb,1);
michael@0	61	vb->nW=oggpack_read(opb,1);
michael@0	62	if(vb->nW==-1) return(OV_EBADPACKET);
michael@0	63	}else{
michael@0	64	vb->lW=0;
michael@0	65	vb->nW=0;
michael@0	66	}
michael@0	67
michael@0	68	/* more setup */
michael@0	69	vb->granulepos=op->granulepos;
michael@0	70	vb->sequence=op->packetno-3; /* first block is third packet */
michael@0	71	vb->eofflag=op->e_o_s;
michael@0	72
michael@0	73	if(decodep){
michael@0	74	/* alloc pcm passback storage */
michael@0	75	vb->pcmend=ci->blocksizes[vb->W];
michael@0	76	vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
michael@0	77	for(i=0;i<vi->channels;i++)
michael@0	78	vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i]));
michael@0	79
michael@0	80	/* unpack_header enforces range checking */
michael@0	81	type=ci->map_type[ci->mode_param[mode]->mapping];
michael@0	82
michael@0	83	return(_mapping_P[type]->inverse(vb,b->mode[mode]));
michael@0	84	}else{
michael@0	85	/* no pcm */
michael@0	86	vb->pcmend=0;
michael@0	87	vb->pcm=NULL;
michael@0	88
michael@0	89	return(0);
michael@0	90	}
michael@0	91	}
michael@0	92
michael@0	93	int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){
michael@0	94	return _vorbis_synthesis1(vb,op,1);
michael@0	95	}
michael@0	96
michael@0	97	/* used to track pcm position without actually performing decode.
michael@0	98	Useful for sequential 'fast forward' */
michael@0	99	int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){
michael@0	100	return _vorbis_synthesis1(vb,op,0);
michael@0	101	}
michael@0	102
michael@0	103	long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
michael@0	104	codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
michael@0	105	oggpack_buffer opb;
michael@0	106	int mode;
michael@0	107
michael@0	108	oggpack_readinit(&opb,op->packet,op->bytes);
michael@0	109
michael@0	110	/* Check the packet type */
michael@0	111	if(oggpack_read(&opb,1)!=0){
michael@0	112	/* Oops. This is not an audio data packet */
michael@0	113	return(OV_ENOTAUDIO);
michael@0	114	}
michael@0	115
michael@0	116	{
michael@0	117	int modebits=0;
michael@0	118	int v=ci->modes;
michael@0	119	while(v>1){
michael@0	120	modebits++;
michael@0	121	v>>=1;
michael@0	122	}
michael@0	123
michael@0	124	/* read our mode and pre/post windowsize */
michael@0	125	mode=oggpack_read(&opb,modebits);
michael@0	126	}
michael@0	127	if(mode==-1)return(OV_EBADPACKET);
michael@0	128	return(ci->blocksizes[ci->mode_param[mode]->blockflag]);
michael@0	129	}
michael@0	130
michael@0	131