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media/libvorbis/lib/vorbis_synthesis.c@97036ab72558 (annotated)

media/libvorbis/lib/vorbis_synthesis.c

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/********************************************************************
michael@0	2	* *
michael@0	3	* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
michael@0	4	* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
michael@0	5	* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0	6	* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
michael@0	7	* *
michael@0	8	* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
michael@0	9	* by the Xiph.Org Foundation http://www.xiph.org/ *
michael@0	10	* *
michael@0	11	********************************************************************
michael@0	12
michael@0	13	function: single-block PCM synthesis
michael@0	14	last mod: $Id: synthesis.c 17474 2010-09-30 03:41:41Z gmaxwell $
michael@0	15
michael@0	16	********************************************************************/
michael@0	17
michael@0	18	#include <stdio.h>
michael@0	19	#include <ogg/ogg.h>
michael@0	20	#include "vorbis/codec.h"
michael@0	21	#include "codec_internal.h"
michael@0	22	#include "registry.h"
michael@0	23	#include "misc.h"
michael@0	24	#include "os.h"
michael@0	25
michael@0	26	int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){
michael@0	27	vorbis_dsp_state *vd= vb ? vb->vd : 0;
michael@0	28	private_state *b= vd ? vd->backend_state : 0;
michael@0	29	vorbis_info *vi= vd ? vd->vi : 0;
michael@0	30	codec_setup_info *ci= vi ? vi->codec_setup : 0;
michael@0	31	oggpack_buffer *opb=vb ? &vb->opb : 0;
michael@0	32	int type,mode,i;
michael@0	33
michael@0	34	if (!vd || !b || !vi || !ci || !opb) {
michael@0	35	return OV_EBADPACKET;
michael@0	36	}
michael@0	37
michael@0	38	/* first things first. Make sure decode is ready */
michael@0	39	_vorbis_block_ripcord(vb);
michael@0	40	oggpack_readinit(opb,op->packet,op->bytes);
michael@0	41
michael@0	42	/* Check the packet type */
michael@0	43	if(oggpack_read(opb,1)!=0){
michael@0	44	/* Oops. This is not an audio data packet */
michael@0	45	return(OV_ENOTAUDIO);
michael@0	46	}
michael@0	47
michael@0	48	/* read our mode and pre/post windowsize */
michael@0	49	mode=oggpack_read(opb,b->modebits);
michael@0	50	if(mode==-1){
michael@0	51	return(OV_EBADPACKET);
michael@0	52	}
michael@0	53
michael@0	54	vb->mode=mode;
michael@0	55	if(!ci->mode_param[mode]){
michael@0	56	return(OV_EBADPACKET);
michael@0	57	}
michael@0	58
michael@0	59	vb->W=ci->mode_param[mode]->blockflag;
michael@0	60	if(vb->W){
michael@0	61
michael@0	62	/* this doesn;t get mapped through mode selection as it's used
michael@0	63	only for window selection */
michael@0	64	vb->lW=oggpack_read(opb,1);
michael@0	65	vb->nW=oggpack_read(opb,1);
michael@0	66	if(vb->nW==-1){
michael@0	67	return(OV_EBADPACKET);
michael@0	68	}
michael@0	69	}else{
michael@0	70	vb->lW=0;
michael@0	71	vb->nW=0;
michael@0	72	}
michael@0	73
michael@0	74	/* more setup */
michael@0	75	vb->granulepos=op->granulepos;
michael@0	76	vb->sequence=op->packetno;
michael@0	77	vb->eofflag=op->e_o_s;
michael@0	78
michael@0	79	/* alloc pcm passback storage */
michael@0	80	vb->pcmend=ci->blocksizes[vb->W];
michael@0	81	vb->pcm=_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
michael@0	82	for(i=0;i<vi->channels;i++)
michael@0	83	vb->pcm[i]=_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i]));
michael@0	84
michael@0	85	/* unpack_header enforces range checking */
michael@0	86	type=ci->map_type[ci->mode_param[mode]->mapping];
michael@0	87
michael@0	88	return(_mapping_P[type]->inverse(vb,ci->map_param[ci->mode_param[mode]->
michael@0	89	mapping]));
michael@0	90	}
michael@0	91
michael@0	92	/* used to track pcm position without actually performing decode.
michael@0	93	Useful for sequential 'fast forward' */
michael@0	94	int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){
michael@0	95	vorbis_dsp_state *vd=vb->vd;
michael@0	96	private_state *b=vd->backend_state;
michael@0	97	vorbis_info *vi=vd->vi;
michael@0	98	codec_setup_info *ci=vi->codec_setup;
michael@0	99	oggpack_buffer *opb=&vb->opb;
michael@0	100	int mode;
michael@0	101
michael@0	102	/* first things first. Make sure decode is ready */
michael@0	103	_vorbis_block_ripcord(vb);
michael@0	104	oggpack_readinit(opb,op->packet,op->bytes);
michael@0	105
michael@0	106	/* Check the packet type */
michael@0	107	if(oggpack_read(opb,1)!=0){
michael@0	108	/* Oops. This is not an audio data packet */
michael@0	109	return(OV_ENOTAUDIO);
michael@0	110	}
michael@0	111
michael@0	112	/* read our mode and pre/post windowsize */
michael@0	113	mode=oggpack_read(opb,b->modebits);
michael@0	114	if(mode==-1)return(OV_EBADPACKET);
michael@0	115
michael@0	116	vb->mode=mode;
michael@0	117	if(!ci->mode_param[mode]){
michael@0	118	return(OV_EBADPACKET);
michael@0	119	}
michael@0	120
michael@0	121	vb->W=ci->mode_param[mode]->blockflag;
michael@0	122	if(vb->W){
michael@0	123	vb->lW=oggpack_read(opb,1);
michael@0	124	vb->nW=oggpack_read(opb,1);
michael@0	125	if(vb->nW==-1) return(OV_EBADPACKET);
michael@0	126	}else{
michael@0	127	vb->lW=0;
michael@0	128	vb->nW=0;
michael@0	129	}
michael@0	130
michael@0	131	/* more setup */
michael@0	132	vb->granulepos=op->granulepos;
michael@0	133	vb->sequence=op->packetno;
michael@0	134	vb->eofflag=op->e_o_s;
michael@0	135
michael@0	136	/* no pcm */
michael@0	137	vb->pcmend=0;
michael@0	138	vb->pcm=NULL;
michael@0	139
michael@0	140	return(0);
michael@0	141	}
michael@0	142
michael@0	143	long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
michael@0	144	codec_setup_info *ci=vi->codec_setup;
michael@0	145	oggpack_buffer opb;
michael@0	146	int mode;
michael@0	147
michael@0	148	oggpack_readinit(&opb,op->packet,op->bytes);
michael@0	149
michael@0	150	/* Check the packet type */
michael@0	151	if(oggpack_read(&opb,1)!=0){
michael@0	152	/* Oops. This is not an audio data packet */
michael@0	153	return(OV_ENOTAUDIO);
michael@0	154	}
michael@0	155
michael@0	156	{
michael@0	157	int modebits=0;
michael@0	158	int v=ci->modes;
michael@0	159	while(v>1){
michael@0	160	modebits++;
michael@0	161	v>>=1;
michael@0	162	}
michael@0	163
michael@0	164	/* read our mode and pre/post windowsize */
michael@0	165	mode=oggpack_read(&opb,modebits);
michael@0	166	}
michael@0	167	if(mode==-1)return(OV_EBADPACKET);
michael@0	168	return(ci->blocksizes[ci->mode_param[mode]->blockflag]);
michael@0	169	}
michael@0	170
michael@0	171	int vorbis_synthesis_halfrate(vorbis_info *vi,int flag){
michael@0	172	/* set / clear half-sample-rate mode */
michael@0	173	codec_setup_info *ci=vi->codec_setup;
michael@0	174
michael@0	175	/* right now, our MDCT can't handle < 64 sample windows. */
michael@0	176	if(ci->blocksizes[0]<=64 && flag)return -1;
michael@0	177	ci->halfrate_flag=(flag?1:0);
michael@0	178	return 0;
michael@0	179	}
michael@0	180
michael@0	181	int vorbis_synthesis_halfrate_p(vorbis_info *vi){
michael@0	182	codec_setup_info *ci=vi->codec_setup;
michael@0	183	return ci->halfrate_flag;
michael@0	184	}