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https://github.com/ekeeke/Genesis-Plus-GX.git
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c32af0586a
.fixed SEEK command emulation (Lunar the Silver Star freeze regression) .added .OGG files support for CD audio tracks (use same naming convention as .WAV files, cf. README.pdf) [Win32] removed win32/SDL port makefile to prevent stupid websites like EmuCR from compiling & distributing it (for the last time, it's a buggy, unstable & incomplete port which is not meant to be used for anything but debugging)
1598 lines
46 KiB
C
1598 lines
46 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: stdio-based convenience library for opening/seeking/decoding
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last mod: $Id: vorbisfile.c,v 1.6 2003/03/30 23:40:56 xiphmont Exp $
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********************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <math.h>
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#include "ivorbiscodec.h"
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#include "ivorbisfile.h"
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#include "misc.h"
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/* A 'chained bitstream' is a Vorbis bitstream that contains more than
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one logical bitstream arranged end to end (the only form of Ogg
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multiplexing allowed in a Vorbis bitstream; grouping [parallel
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multiplexing] is not allowed in Vorbis) */
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/* A Vorbis file can be played beginning to end (streamed) without
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worrying ahead of time about chaining (see decoder_example.c). If
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we have the whole file, however, and want random access
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(seeking/scrubbing) or desire to know the total length/time of a
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file, we need to account for the possibility of chaining. */
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/* We can handle things a number of ways; we can determine the entire
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bitstream structure right off the bat, or find pieces on demand.
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This example determines and caches structure for the entire
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bitstream, but builds a virtual decoder on the fly when moving
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between links in the chain. */
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/* There are also different ways to implement seeking. Enough
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information exists in an Ogg bitstream to seek to
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sample-granularity positions in the output. Or, one can seek by
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picking some portion of the stream roughly in the desired area if
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we only want coarse navigation through the stream. */
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/*************************************************************************
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* Many, many internal helpers. The intention is not to be confusing;
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* rampant duplication and monolithic function implementation would be
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* harder to understand anyway. The high level functions are last. Begin
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* grokking near the end of the file */
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/* read a little more data from the file/pipe into the ogg_sync framer */
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static long _get_data(OggVorbis_File *vf){
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errno=0;
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if(vf->datasource){
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unsigned char *buffer=ogg_sync_bufferin(vf->oy,CHUNKSIZE);
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long bytes=(vf->callbacks.read_func)(buffer,1,CHUNKSIZE,vf->datasource);
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if(bytes>0)ogg_sync_wrote(vf->oy,bytes);
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#ifndef GEKKO
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else if(bytes==0 && errno )
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#else
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// Not sure what is up with this... appears that EOVERFLOW is set whenever
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// we read to the end of the file...
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// original patch by raz0red for Mednafen-Wii
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else if(bytes==0 && errno && errno != EOVERFLOW )
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#endif
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{
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return(-1);
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}
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return(bytes);
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}else
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return(0);
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}
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/* save a tiny smidge of verbosity to make the code more readable */
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static void _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){
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if(vf->datasource){
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(vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET);
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vf->offset=offset;
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ogg_sync_reset(vf->oy);
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}else{
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/* shouldn't happen unless someone writes a broken callback */
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return;
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}
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}
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/* The read/seek functions track absolute position within the stream */
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/* from the head of the stream, get the next page. boundary specifies
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if the function is allowed to fetch more data from the stream (and
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how much) or only use internally buffered data.
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boundary: -1) unbounded search
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0) read no additional data; use cached only
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n) search for a new page beginning for n bytes
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return: <0) did not find a page (OV_FALSE, OV_EOF, OV_EREAD)
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n) found a page at absolute offset n
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produces a refcounted page */
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static ogg_int64_t _get_next_page(OggVorbis_File *vf,ogg_page *og,
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ogg_int64_t boundary){
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if(boundary>0)boundary+=vf->offset;
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while(1){
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long more;
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if(boundary>0 && vf->offset>=boundary)return(OV_FALSE);
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more=ogg_sync_pageseek(vf->oy,og);
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if(more<0){
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/* skipped n bytes */
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vf->offset-=more;
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}else{
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if(more==0){
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/* send more paramedics */
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if(!boundary)return(OV_FALSE);
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{
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long ret=_get_data(vf);
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if(ret==0)return(OV_EOF);
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if(ret<0)return(OV_EREAD);
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}
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}else{
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/* got a page. Return the offset at the page beginning,
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advance the internal offset past the page end */
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ogg_int64_t ret=vf->offset;
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vf->offset+=more;
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return(ret);
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}
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}
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}
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}
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/* find the latest page beginning before the current stream cursor
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position. Much dirtier than the above as Ogg doesn't have any
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backward search linkage. no 'readp' as it will certainly have to
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read. */
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/* returns offset or OV_EREAD, OV_FAULT and produces a refcounted page */
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static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_page *og){
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ogg_int64_t begin=vf->offset;
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ogg_int64_t end=begin;
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ogg_int64_t ret;
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ogg_int64_t offset=-1;
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while(offset==-1){
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begin-=CHUNKSIZE;
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if(begin<0)
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begin=0;
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_seek_helper(vf,begin);
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while(vf->offset<end){
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ret=_get_next_page(vf,og,end-vf->offset);
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if(ret==OV_EREAD)return(OV_EREAD);
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if(ret<0){
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break;
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}else{
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offset=ret;
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}
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}
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}
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/* we have the offset. Actually snork and hold the page now */
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_seek_helper(vf,offset);
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ret=_get_next_page(vf,og,CHUNKSIZE);
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if(ret<0)
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/* this shouldn't be possible */
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return(OV_EFAULT);
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return(offset);
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}
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/* finds each bitstream link one at a time using a bisection search
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(has to begin by knowing the offset of the lb's initial page).
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Recurses for each link so it can alloc the link storage after
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finding them all, then unroll and fill the cache at the same time */
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static int _bisect_forward_serialno(OggVorbis_File *vf,
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ogg_int64_t begin,
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ogg_int64_t searched,
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ogg_int64_t end,
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ogg_uint32_t currentno,
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long m){
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ogg_int64_t endsearched=end;
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ogg_int64_t next=end;
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ogg_page og={0,0,0,0};
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ogg_int64_t ret;
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/* the below guards against garbage seperating the last and
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first pages of two links. */
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while(searched<endsearched){
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ogg_int64_t bisect;
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if(endsearched-searched<CHUNKSIZE){
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bisect=searched;
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}else{
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bisect=(searched+endsearched)/2;
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}
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_seek_helper(vf,bisect);
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ret=_get_next_page(vf,&og,-1);
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if(ret==OV_EREAD)return(OV_EREAD);
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if(ret<0 || ogg_page_serialno(&og)!=currentno){
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endsearched=bisect;
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if(ret>=0)next=ret;
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}else{
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searched=ret+og.header_len+og.body_len;
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}
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ogg_page_release(&og);
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}
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_seek_helper(vf,next);
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ret=_get_next_page(vf,&og,-1);
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if(ret==OV_EREAD)return(OV_EREAD);
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if(searched>=end || ret<0){
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ogg_page_release(&og);
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vf->links=m+1;
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vf->offsets=_ogg_malloc((vf->links+1)*sizeof(*vf->offsets));
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vf->serialnos=_ogg_malloc(vf->links*sizeof(*vf->serialnos));
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vf->offsets[m+1]=searched;
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}else{
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ret=_bisect_forward_serialno(vf,next,vf->offset,
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end,ogg_page_serialno(&og),m+1);
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ogg_page_release(&og);
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if(ret==OV_EREAD)return(OV_EREAD);
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}
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vf->offsets[m]=begin;
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vf->serialnos[m]=currentno;
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return(0);
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}
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/* uses the local ogg_stream storage in vf; this is important for
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non-streaming input sources */
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/* consumes the page that's passed in (if any) */
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static int _fetch_headers(OggVorbis_File *vf,
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vorbis_info *vi,
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vorbis_comment *vc,
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ogg_uint32_t *serialno,
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ogg_page *og_ptr){
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ogg_page og={0,0,0,0};
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ogg_packet op={0,0,0,0,0,0};
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int i,ret;
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if(!og_ptr){
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ogg_int64_t llret=_get_next_page(vf,&og,CHUNKSIZE);
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if(llret==OV_EREAD)return(OV_EREAD);
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if(llret<0)return OV_ENOTVORBIS;
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og_ptr=&og;
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}
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ogg_stream_reset_serialno(vf->os,ogg_page_serialno(og_ptr));
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if(serialno)*serialno=vf->os->serialno;
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vf->ready_state=STREAMSET;
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/* extract the initial header from the first page and verify that the
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Ogg bitstream is in fact Vorbis data */
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vorbis_info_init(vi);
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vorbis_comment_init(vc);
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i=0;
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while(i<3){
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ogg_stream_pagein(vf->os,og_ptr);
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while(i<3){
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int result=ogg_stream_packetout(vf->os,&op);
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if(result==0)break;
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if(result==-1){
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ret=OV_EBADHEADER;
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goto bail_header;
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}
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if((ret=vorbis_synthesis_headerin(vi,vc,&op))){
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goto bail_header;
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}
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i++;
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}
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if(i<3)
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if(_get_next_page(vf,og_ptr,CHUNKSIZE)<0){
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ret=OV_EBADHEADER;
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goto bail_header;
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}
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}
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ogg_packet_release(&op);
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ogg_page_release(&og);
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return 0;
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bail_header:
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ogg_packet_release(&op);
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ogg_page_release(&og);
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vorbis_info_clear(vi);
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vorbis_comment_clear(vc);
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vf->ready_state=OPENED;
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return ret;
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}
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/* last step of the OggVorbis_File initialization; get all the
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vorbis_info structs and PCM positions. Only called by the seekable
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initialization (local stream storage is hacked slightly; pay
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attention to how that's done) */
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/* this is void and does not propogate errors up because we want to be
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able to open and use damaged bitstreams as well as we can. Just
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watch out for missing information for links in the OggVorbis_File
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struct */
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static void _prefetch_all_headers(OggVorbis_File *vf, ogg_int64_t dataoffset){
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ogg_page og={0,0,0,0};
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int i;
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ogg_int64_t ret;
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vf->vi=_ogg_realloc(vf->vi,vf->links*sizeof(*vf->vi));
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vf->vc=_ogg_realloc(vf->vc,vf->links*sizeof(*vf->vc));
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vf->dataoffsets=_ogg_malloc(vf->links*sizeof(*vf->dataoffsets));
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vf->pcmlengths=_ogg_malloc(vf->links*2*sizeof(*vf->pcmlengths));
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for(i=0;i<vf->links;i++){
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if(i==0){
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/* we already grabbed the initial header earlier. Just set the offset */
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vf->dataoffsets[i]=dataoffset;
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_seek_helper(vf,dataoffset);
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}else{
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/* seek to the location of the initial header */
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_seek_helper(vf,vf->offsets[i]);
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if(_fetch_headers(vf,vf->vi+i,vf->vc+i,NULL,NULL)<0){
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vf->dataoffsets[i]=-1;
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}else{
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vf->dataoffsets[i]=vf->offset;
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}
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}
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/* fetch beginning PCM offset */
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if(vf->dataoffsets[i]!=-1){
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ogg_int64_t accumulated=0,pos;
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long lastblock=-1;
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int result;
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ogg_stream_reset_serialno(vf->os,vf->serialnos[i]);
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while(1){
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ogg_packet op={0,0,0,0,0,0};
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ret=_get_next_page(vf,&og,-1);
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if(ret<0)
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/* this should not be possible unless the file is
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truncated/mangled */
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break;
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if(ogg_page_serialno(&og)!=vf->serialnos[i])
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break;
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pos=ogg_page_granulepos(&og);
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/* count blocksizes of all frames in the page */
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ogg_stream_pagein(vf->os,&og);
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while((result=ogg_stream_packetout(vf->os,&op))){
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if(result>0){ /* ignore holes */
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long thisblock=vorbis_packet_blocksize(vf->vi+i,&op);
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if(lastblock!=-1)
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accumulated+=(lastblock+thisblock)>>2;
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lastblock=thisblock;
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}
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}
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ogg_packet_release(&op);
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if(pos!=-1){
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/* pcm offset of last packet on the first audio page */
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accumulated= pos-accumulated;
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break;
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}
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}
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/* less than zero? This is a stream with samples trimmed off
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the beginning, a normal occurrence; set the offset to zero */
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if(accumulated<0)accumulated=0;
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vf->pcmlengths[i*2]=accumulated;
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}
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/* get the PCM length of this link. To do this,
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get the last page of the stream */
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{
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ogg_int64_t end=vf->offsets[i+1];
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_seek_helper(vf,end);
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while(1){
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ret=_get_prev_page(vf,&og);
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if(ret<0){
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/* this should not be possible */
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vorbis_info_clear(vf->vi+i);
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vorbis_comment_clear(vf->vc+i);
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break;
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}
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if(ogg_page_granulepos(&og)!=-1){
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vf->pcmlengths[i*2+1]=ogg_page_granulepos(&og)-vf->pcmlengths[i*2];
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break;
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}
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vf->offset=ret;
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}
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}
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}
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ogg_page_release(&og);
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}
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static void _make_decode_ready(OggVorbis_File *vf){
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if(vf->ready_state!=STREAMSET)return;
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if(vf->seekable){
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vorbis_synthesis_init(&vf->vd,vf->vi+vf->current_link);
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}else{
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vorbis_synthesis_init(&vf->vd,vf->vi);
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}
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vorbis_block_init(&vf->vd,&vf->vb);
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vf->ready_state=INITSET;
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vf->bittrack=0;
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vf->samptrack=0;
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return;
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}
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|
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static int _open_seekable2(OggVorbis_File *vf){
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ogg_uint32_t serialno=vf->current_serialno;
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ogg_uint32_t tempserialno;
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ogg_int64_t dataoffset=vf->offset, end;
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ogg_page og={0,0,0,0};
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|
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/* we're partially open and have a first link header state in
|
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storage in vf */
|
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/* we can seek, so set out learning all about this file */
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(vf->callbacks.seek_func)(vf->datasource,0,SEEK_END);
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vf->offset=vf->end=(vf->callbacks.tell_func)(vf->datasource);
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|
|
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/* We get the offset for the last page of the physical bitstream.
|
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Most OggVorbis files will contain a single logical bitstream */
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end=_get_prev_page(vf,&og);
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if(end<0)return(end);
|
|
|
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/* more than one logical bitstream? */
|
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tempserialno=ogg_page_serialno(&og);
|
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ogg_page_release(&og);
|
|
|
|
if(tempserialno!=serialno){
|
|
|
|
/* Chained bitstream. Bisect-search each logical bitstream
|
|
section. Do so based on serial number only */
|
|
if(_bisect_forward_serialno(vf,0,0,end+1,serialno,0)<0)return(OV_EREAD);
|
|
|
|
}else{
|
|
|
|
/* Only one logical bitstream */
|
|
if(_bisect_forward_serialno(vf,0,end,end+1,serialno,0))return(OV_EREAD);
|
|
|
|
}
|
|
|
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/* the initial header memory is referenced by vf after; don't free it */
|
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_prefetch_all_headers(vf,dataoffset);
|
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return(ov_raw_seek(vf,0));
|
|
}
|
|
|
|
/* clear out the current logical bitstream decoder */
|
|
static void _decode_clear(OggVorbis_File *vf){
|
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vorbis_dsp_clear(&vf->vd);
|
|
vorbis_block_clear(&vf->vb);
|
|
vf->ready_state=OPENED;
|
|
}
|
|
|
|
/* fetch and process a packet. Handles the case where we're at a
|
|
bitstream boundary and dumps the decoding machine. If the decoding
|
|
machine is unloaded, it loads it. It also keeps pcm_offset up to
|
|
date (seek and read both use this. seek uses a special hack with
|
|
readp).
|
|
|
|
return: <0) error, OV_HOLE (lost packet) or OV_EOF
|
|
0) need more data (only if readp==0)
|
|
1) got a packet
|
|
*/
|
|
|
|
static int _fetch_and_process_packet(OggVorbis_File *vf,
|
|
int readp,
|
|
int spanp){
|
|
ogg_page og={0,0,0,0};
|
|
ogg_packet op={0,0,0,0,0,0};
|
|
int ret=0;
|
|
|
|
/* handle one packet. Try to fetch it from current stream state */
|
|
/* extract packets from page */
|
|
while(1){
|
|
|
|
/* process a packet if we can. If the machine isn't loaded,
|
|
neither is a page */
|
|
if(vf->ready_state==INITSET){
|
|
while(1) {
|
|
int result=ogg_stream_packetout(vf->os,&op);
|
|
ogg_int64_t granulepos;
|
|
|
|
if(result<0){
|
|
ret=OV_HOLE; /* hole in the data. */
|
|
goto cleanup;
|
|
}
|
|
if(result>0){
|
|
/* got a packet. process it */
|
|
granulepos=op.granulepos;
|
|
if(!vorbis_synthesis(&vf->vb,&op,1)){ /* lazy check for lazy
|
|
header handling. The
|
|
header packets aren't
|
|
audio, so if/when we
|
|
submit them,
|
|
vorbis_synthesis will
|
|
reject them */
|
|
|
|
/* suck in the synthesis data and track bitrate */
|
|
{
|
|
int oldsamples=vorbis_synthesis_pcmout(&vf->vd,NULL);
|
|
/* for proper use of libvorbis within libvorbisfile,
|
|
oldsamples will always be zero. */
|
|
if(oldsamples){
|
|
ret=OV_EFAULT;
|
|
goto cleanup;
|
|
}
|
|
|
|
vorbis_synthesis_blockin(&vf->vd,&vf->vb);
|
|
vf->samptrack+=vorbis_synthesis_pcmout(&vf->vd,NULL)-oldsamples;
|
|
vf->bittrack+=op.bytes*8;
|
|
}
|
|
|
|
/* update the pcm offset. */
|
|
if(granulepos!=-1 && !op.e_o_s){
|
|
int link=(vf->seekable?vf->current_link:0);
|
|
int i,samples;
|
|
|
|
/* this packet has a pcm_offset on it (the last packet
|
|
completed on a page carries the offset) After processing
|
|
(above), we know the pcm position of the *last* sample
|
|
ready to be returned. Find the offset of the *first*
|
|
|
|
As an aside, this trick is inaccurate if we begin
|
|
reading anew right at the last page; the end-of-stream
|
|
granulepos declares the last frame in the stream, and the
|
|
last packet of the last page may be a partial frame.
|
|
So, we need a previous granulepos from an in-sequence page
|
|
to have a reference point. Thus the !op.e_o_s clause
|
|
above */
|
|
|
|
if(vf->seekable && link>0)
|
|
granulepos-=vf->pcmlengths[link*2];
|
|
if(granulepos<0)granulepos=0; /* actually, this
|
|
shouldn't be possible
|
|
here unless the stream
|
|
is very broken */
|
|
|
|
samples=vorbis_synthesis_pcmout(&vf->vd,NULL);
|
|
|
|
granulepos-=samples;
|
|
for(i=0;i<link;i++)
|
|
granulepos+=vf->pcmlengths[i*2+1];
|
|
vf->pcm_offset=granulepos;
|
|
}
|
|
ret=1;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(vf->ready_state>=OPENED){
|
|
int ret;
|
|
if(!readp){
|
|
ret=0;
|
|
goto cleanup;
|
|
}
|
|
if((ret=_get_next_page(vf,&og,-1))<0){
|
|
ret=OV_EOF; /* eof. leave unitialized */
|
|
goto cleanup;
|
|
}
|
|
|
|
/* bitrate tracking; add the header's bytes here, the body bytes
|
|
are done by packet above */
|
|
vf->bittrack+=og.header_len*8;
|
|
|
|
/* has our decoding just traversed a bitstream boundary? */
|
|
if(vf->ready_state==INITSET){
|
|
if(vf->current_serialno!=ogg_page_serialno(&og)){
|
|
if(!spanp){
|
|
ret=OV_EOF;
|
|
goto cleanup;
|
|
}
|
|
|
|
_decode_clear(vf);
|
|
|
|
if(!vf->seekable){
|
|
vorbis_info_clear(vf->vi);
|
|
vorbis_comment_clear(vf->vc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Do we need to load a new machine before submitting the page? */
|
|
/* This is different in the seekable and non-seekable cases.
|
|
|
|
In the seekable case, we already have all the header
|
|
information loaded and cached; we just initialize the machine
|
|
with it and continue on our merry way.
|
|
|
|
In the non-seekable (streaming) case, we'll only be at a
|
|
boundary if we just left the previous logical bitstream and
|
|
we're now nominally at the header of the next bitstream
|
|
*/
|
|
|
|
if(vf->ready_state!=INITSET){
|
|
int link;
|
|
|
|
if(vf->ready_state<STREAMSET){
|
|
if(vf->seekable){
|
|
vf->current_serialno=ogg_page_serialno(&og);
|
|
|
|
/* match the serialno to bitstream section. We use this rather than
|
|
offset positions to avoid problems near logical bitstream
|
|
boundaries */
|
|
for(link=0;link<vf->links;link++)
|
|
if(vf->serialnos[link]==vf->current_serialno)break;
|
|
if(link==vf->links){
|
|
ret=OV_EBADLINK; /* sign of a bogus stream. error out,
|
|
leave machine uninitialized */
|
|
goto cleanup;
|
|
}
|
|
|
|
vf->current_link=link;
|
|
|
|
ogg_stream_reset_serialno(vf->os,vf->current_serialno);
|
|
vf->ready_state=STREAMSET;
|
|
|
|
}else{
|
|
/* we're streaming */
|
|
/* fetch the three header packets, build the info struct */
|
|
|
|
int ret=_fetch_headers(vf,vf->vi,vf->vc,&vf->current_serialno,&og);
|
|
if(ret) goto cleanup;
|
|
vf->current_link++;
|
|
link=0;
|
|
}
|
|
}
|
|
|
|
_make_decode_ready(vf);
|
|
}
|
|
ogg_stream_pagein(vf->os,&og);
|
|
}
|
|
cleanup:
|
|
ogg_packet_release(&op);
|
|
ogg_page_release(&og);
|
|
return ret;
|
|
}
|
|
|
|
/* if, eg, 64 bit stdio is configured by default, this will build with
|
|
fseek64 */
|
|
static int _fseek64_wrap(FILE *f,ogg_int64_t off,int whence){
|
|
if(f==NULL)return(-1);
|
|
return fseek(f,off,whence);
|
|
}
|
|
|
|
static int _ov_open1(void *f,OggVorbis_File *vf,char *initial,
|
|
long ibytes, ov_callbacks callbacks){
|
|
int offsettest=(f?callbacks.seek_func(f,0,SEEK_CUR):-1);
|
|
int ret;
|
|
|
|
memset(vf,0,sizeof(*vf));
|
|
vf->datasource=f;
|
|
vf->callbacks = callbacks;
|
|
|
|
/* init the framing state */
|
|
vf->oy=ogg_sync_create();
|
|
|
|
/* perhaps some data was previously read into a buffer for testing
|
|
against other stream types. Allow initialization from this
|
|
previously read data (as we may be reading from a non-seekable
|
|
stream) */
|
|
if(initial){
|
|
unsigned char *buffer=ogg_sync_bufferin(vf->oy,ibytes);
|
|
memcpy(buffer,initial,ibytes);
|
|
ogg_sync_wrote(vf->oy,ibytes);
|
|
}
|
|
|
|
/* can we seek? Stevens suggests the seek test was portable */
|
|
if(offsettest!=-1)vf->seekable=1;
|
|
|
|
/* No seeking yet; Set up a 'single' (current) logical bitstream
|
|
entry for partial open */
|
|
vf->links=1;
|
|
vf->vi=_ogg_calloc(vf->links,sizeof(*vf->vi));
|
|
vf->vc=_ogg_calloc(vf->links,sizeof(*vf->vc));
|
|
vf->os=ogg_stream_create(-1); /* fill in the serialno later */
|
|
|
|
/* Try to fetch the headers, maintaining all the storage */
|
|
if((ret=_fetch_headers(vf,vf->vi,vf->vc,&vf->current_serialno,NULL))<0){
|
|
vf->datasource=NULL;
|
|
ov_clear(vf);
|
|
}else if(vf->ready_state < PARTOPEN)
|
|
vf->ready_state=PARTOPEN;
|
|
return(ret);
|
|
}
|
|
|
|
static int _ov_open2(OggVorbis_File *vf){
|
|
if(vf->ready_state < OPENED)
|
|
vf->ready_state=OPENED;
|
|
if(vf->seekable){
|
|
int ret=_open_seekable2(vf);
|
|
if(ret){
|
|
vf->datasource=NULL;
|
|
ov_clear(vf);
|
|
}
|
|
return(ret);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* clear out the OggVorbis_File struct */
|
|
int ov_clear(OggVorbis_File *vf){
|
|
if(vf){
|
|
vorbis_block_clear(&vf->vb);
|
|
vorbis_dsp_clear(&vf->vd);
|
|
ogg_stream_destroy(vf->os);
|
|
|
|
if(vf->vi && vf->links){
|
|
int i;
|
|
for(i=0;i<vf->links;i++){
|
|
vorbis_info_clear(vf->vi+i);
|
|
vorbis_comment_clear(vf->vc+i);
|
|
}
|
|
_ogg_free(vf->vi);
|
|
_ogg_free(vf->vc);
|
|
}
|
|
if(vf->dataoffsets)_ogg_free(vf->dataoffsets);
|
|
if(vf->pcmlengths)_ogg_free(vf->pcmlengths);
|
|
if(vf->serialnos)_ogg_free(vf->serialnos);
|
|
if(vf->offsets)_ogg_free(vf->offsets);
|
|
ogg_sync_destroy(vf->oy);
|
|
|
|
if(vf->datasource)(vf->callbacks.close_func)(vf->datasource);
|
|
memset(vf,0,sizeof(*vf));
|
|
}
|
|
#ifdef DEBUG_LEAKS
|
|
_VDBG_dump();
|
|
#endif
|
|
return(0);
|
|
}
|
|
|
|
/* inspects the OggVorbis file and finds/documents all the logical
|
|
bitstreams contained in it. Tries to be tolerant of logical
|
|
bitstream sections that are truncated/woogie.
|
|
|
|
return: -1) error
|
|
0) OK
|
|
*/
|
|
|
|
int ov_open_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes,
|
|
ov_callbacks callbacks){
|
|
int ret=_ov_open1(f,vf,initial,ibytes,callbacks);
|
|
if(ret)return ret;
|
|
return _ov_open2(vf);
|
|
}
|
|
|
|
int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){
|
|
ov_callbacks callbacks = {
|
|
(size_t (*)(void *, size_t, size_t, void *)) fread,
|
|
(int (*)(void *, ogg_int64_t, int)) _fseek64_wrap,
|
|
(int (*)(void *)) fclose,
|
|
(long (*)(void *)) ftell
|
|
};
|
|
|
|
return ov_open_callbacks((void *)f, vf, initial, ibytes, callbacks);
|
|
}
|
|
|
|
/* Only partially open the vorbis file; test for Vorbisness, and load
|
|
the headers for the first chain. Do not seek (although test for
|
|
seekability). Use ov_test_open to finish opening the file, else
|
|
ov_clear to close/free it. Same return codes as open. */
|
|
|
|
int ov_test_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes,
|
|
ov_callbacks callbacks)
|
|
{
|
|
return _ov_open1(f,vf,initial,ibytes,callbacks);
|
|
}
|
|
|
|
int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){
|
|
ov_callbacks callbacks = {
|
|
(size_t (*)(void *, size_t, size_t, void *)) fread,
|
|
(int (*)(void *, ogg_int64_t, int)) _fseek64_wrap,
|
|
(int (*)(void *)) fclose,
|
|
(long (*)(void *)) ftell
|
|
};
|
|
|
|
return ov_test_callbacks((void *)f, vf, initial, ibytes, callbacks);
|
|
}
|
|
|
|
int ov_test_open(OggVorbis_File *vf){
|
|
if(vf->ready_state!=PARTOPEN)return(OV_EINVAL);
|
|
return _ov_open2(vf);
|
|
}
|
|
|
|
/* How many logical bitstreams in this physical bitstream? */
|
|
long ov_streams(OggVorbis_File *vf){
|
|
return vf->links;
|
|
}
|
|
|
|
/* Is the FILE * associated with vf seekable? */
|
|
long ov_seekable(OggVorbis_File *vf){
|
|
return vf->seekable;
|
|
}
|
|
|
|
/* returns the bitrate for a given logical bitstream or the entire
|
|
physical bitstream. If the file is open for random access, it will
|
|
find the *actual* average bitrate. If the file is streaming, it
|
|
returns the nominal bitrate (if set) else the average of the
|
|
upper/lower bounds (if set) else -1 (unset).
|
|
|
|
If you want the actual bitrate field settings, get them from the
|
|
vorbis_info structs */
|
|
|
|
long ov_bitrate(OggVorbis_File *vf,int i){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(i>=vf->links)return(OV_EINVAL);
|
|
if(!vf->seekable && i!=0)return(ov_bitrate(vf,0));
|
|
if(i<0){
|
|
ogg_int64_t bits=0;
|
|
int i;
|
|
for(i=0;i<vf->links;i++)
|
|
bits+=(vf->offsets[i+1]-vf->dataoffsets[i])*8;
|
|
/* This once read: return(rint(bits/ov_time_total(vf,-1)));
|
|
* gcc 3.x on x86 miscompiled this at optimisation level 2 and above,
|
|
* so this is slightly transformed to make it work.
|
|
*/
|
|
return(bits*1000/ov_time_total(vf,-1));
|
|
}else{
|
|
if(vf->seekable){
|
|
/* return the actual bitrate */
|
|
return((vf->offsets[i+1]-vf->dataoffsets[i])*8000/ov_time_total(vf,i));
|
|
}else{
|
|
/* return nominal if set */
|
|
if(vf->vi[i].bitrate_nominal>0){
|
|
return vf->vi[i].bitrate_nominal;
|
|
}else{
|
|
if(vf->vi[i].bitrate_upper>0){
|
|
if(vf->vi[i].bitrate_lower>0){
|
|
return (vf->vi[i].bitrate_upper+vf->vi[i].bitrate_lower)/2;
|
|
}else{
|
|
return vf->vi[i].bitrate_upper;
|
|
}
|
|
}
|
|
return(OV_FALSE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* returns the actual bitrate since last call. returns -1 if no
|
|
additional data to offer since last call (or at beginning of stream),
|
|
EINVAL if stream is only partially open
|
|
*/
|
|
long ov_bitrate_instant(OggVorbis_File *vf){
|
|
int link=(vf->seekable?vf->current_link:0);
|
|
long ret;
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(vf->samptrack==0)return(OV_FALSE);
|
|
ret=vf->bittrack/vf->samptrack*vf->vi[link].rate;
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
return(ret);
|
|
}
|
|
|
|
/* Guess */
|
|
long ov_serialnumber(OggVorbis_File *vf,int i){
|
|
if(i>=vf->links)return(ov_serialnumber(vf,vf->links-1));
|
|
if(!vf->seekable && i>=0)return(ov_serialnumber(vf,-1));
|
|
if(i<0){
|
|
return(vf->current_serialno);
|
|
}else{
|
|
return(vf->serialnos[i]);
|
|
}
|
|
}
|
|
|
|
/* returns: total raw (compressed) length of content if i==-1
|
|
raw (compressed) length of that logical bitstream for i==0 to n
|
|
OV_EINVAL if the stream is not seekable (we can't know the length)
|
|
or if stream is only partially open
|
|
*/
|
|
ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable || i>=vf->links)return(OV_EINVAL);
|
|
if(i<0){
|
|
ogg_int64_t acc=0;
|
|
int i;
|
|
for(i=0;i<vf->links;i++)
|
|
acc+=ov_raw_total(vf,i);
|
|
return(acc);
|
|
}else{
|
|
return(vf->offsets[i+1]-vf->offsets[i]);
|
|
}
|
|
}
|
|
|
|
/* returns: total PCM length (samples) of content if i==-1 PCM length
|
|
(samples) of that logical bitstream for i==0 to n
|
|
OV_EINVAL if the stream is not seekable (we can't know the
|
|
length) or only partially open
|
|
*/
|
|
ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable || i>=vf->links)return(OV_EINVAL);
|
|
if(i<0){
|
|
ogg_int64_t acc=0;
|
|
int i;
|
|
for(i=0;i<vf->links;i++)
|
|
acc+=ov_pcm_total(vf,i);
|
|
return(acc);
|
|
}else{
|
|
return(vf->pcmlengths[i*2+1]);
|
|
}
|
|
}
|
|
|
|
/* returns: total milliseconds of content if i==-1
|
|
milliseconds in that logical bitstream for i==0 to n
|
|
OV_EINVAL if the stream is not seekable (we can't know the
|
|
length) or only partially open
|
|
*/
|
|
ogg_int64_t ov_time_total(OggVorbis_File *vf,int i){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable || i>=vf->links)return(OV_EINVAL);
|
|
if(i<0){
|
|
ogg_int64_t acc=0;
|
|
int i;
|
|
for(i=0;i<vf->links;i++)
|
|
acc+=ov_time_total(vf,i);
|
|
return(acc);
|
|
}else{
|
|
return(((ogg_int64_t)vf->pcmlengths[i*2+1])*1000/vf->vi[i].rate);
|
|
}
|
|
}
|
|
|
|
/* seek to an offset relative to the *compressed* data. This also
|
|
scans packets to update the PCM cursor. It will cross a logical
|
|
bitstream boundary, but only if it can't get any packets out of the
|
|
tail of the bitstream we seek to (so no surprises).
|
|
|
|
returns zero on success, nonzero on failure */
|
|
|
|
int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos){
|
|
ogg_stream_state *work_os=NULL;
|
|
ogg_page og={0,0,0,0};
|
|
ogg_packet op={0,0,0,0,0,0};
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)
|
|
return(OV_ENOSEEK); /* don't dump machine if we can't seek */
|
|
|
|
if(pos<0 || pos>vf->end)return(OV_EINVAL);
|
|
|
|
/* don't yet clear out decoding machine (if it's initialized), in
|
|
the case we're in the same link. Restart the decode lapping, and
|
|
let _fetch_and_process_packet deal with a potential bitstream
|
|
boundary */
|
|
vf->pcm_offset=-1;
|
|
ogg_stream_reset_serialno(vf->os,
|
|
vf->current_serialno); /* must set serialno */
|
|
vorbis_synthesis_restart(&vf->vd);
|
|
|
|
_seek_helper(vf,pos);
|
|
|
|
/* we need to make sure the pcm_offset is set, but we don't want to
|
|
advance the raw cursor past good packets just to get to the first
|
|
with a granulepos. That's not equivalent behavior to beginning
|
|
decoding as immediately after the seek position as possible.
|
|
|
|
So, a hack. We use two stream states; a local scratch state and
|
|
the shared vf->os stream state. We use the local state to
|
|
scan, and the shared state as a buffer for later decode.
|
|
|
|
Unfortuantely, on the last page we still advance to last packet
|
|
because the granulepos on the last page is not necessarily on a
|
|
packet boundary, and we need to make sure the granpos is
|
|
correct.
|
|
*/
|
|
|
|
{
|
|
int lastblock=0;
|
|
int accblock=0;
|
|
int thisblock;
|
|
int eosflag=0;
|
|
|
|
work_os=ogg_stream_create(vf->current_serialno); /* get the memory ready */
|
|
while(1){
|
|
if(vf->ready_state>=STREAMSET){
|
|
/* snarf/scan a packet if we can */
|
|
int result=ogg_stream_packetout(work_os,&op);
|
|
|
|
if(result>0){
|
|
|
|
if(vf->vi[vf->current_link].codec_setup){
|
|
thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op);
|
|
if(thisblock<0){
|
|
ogg_stream_packetout(vf->os,NULL);
|
|
thisblock=0;
|
|
}else{
|
|
|
|
if(eosflag)
|
|
ogg_stream_packetout(vf->os,NULL);
|
|
else
|
|
if(lastblock)accblock+=(lastblock+thisblock)>>2;
|
|
}
|
|
|
|
if(op.granulepos!=-1){
|
|
int i,link=vf->current_link;
|
|
ogg_int64_t granulepos=op.granulepos-vf->pcmlengths[link*2];
|
|
if(granulepos<0)granulepos=0;
|
|
|
|
for(i=0;i<link;i++)
|
|
granulepos+=vf->pcmlengths[i*2+1];
|
|
vf->pcm_offset=granulepos-accblock;
|
|
break;
|
|
}
|
|
lastblock=thisblock;
|
|
continue;
|
|
}else
|
|
ogg_stream_packetout(vf->os,NULL);
|
|
}
|
|
}
|
|
|
|
if(!lastblock){
|
|
if(_get_next_page(vf,&og,-1)<0){
|
|
vf->pcm_offset=ov_pcm_total(vf,-1);
|
|
break;
|
|
}
|
|
}else{
|
|
/* huh? Bogus stream with packets but no granulepos */
|
|
vf->pcm_offset=-1;
|
|
break;
|
|
}
|
|
|
|
/* has our decoding just traversed a bitstream boundary? */
|
|
if(vf->ready_state>=STREAMSET)
|
|
if(vf->current_serialno!=ogg_page_serialno(&og)){
|
|
_decode_clear(vf); /* clear out stream state */
|
|
ogg_stream_destroy(work_os);
|
|
}
|
|
|
|
if(vf->ready_state<STREAMSET){
|
|
int link;
|
|
|
|
vf->current_serialno=ogg_page_serialno(&og);
|
|
for(link=0;link<vf->links;link++)
|
|
if(vf->serialnos[link]==vf->current_serialno)break;
|
|
if(link==vf->links)
|
|
goto seek_error; /* sign of a bogus stream. error out,
|
|
leave machine uninitialized */
|
|
|
|
vf->current_link=link;
|
|
|
|
ogg_stream_reset_serialno(vf->os,vf->current_serialno);
|
|
ogg_stream_reset_serialno(work_os,vf->current_serialno);
|
|
vf->ready_state=STREAMSET;
|
|
|
|
}
|
|
|
|
{
|
|
ogg_page dup;
|
|
ogg_page_dup(&dup,&og);
|
|
eosflag=ogg_page_eos(&og);
|
|
ogg_stream_pagein(vf->os,&og);
|
|
ogg_stream_pagein(work_os,&dup);
|
|
}
|
|
}
|
|
}
|
|
|
|
ogg_packet_release(&op);
|
|
ogg_page_release(&og);
|
|
ogg_stream_destroy(work_os);
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
return(0);
|
|
|
|
seek_error:
|
|
ogg_packet_release(&op);
|
|
ogg_page_release(&og);
|
|
|
|
/* dump the machine so we're in a known state */
|
|
vf->pcm_offset=-1;
|
|
ogg_stream_destroy(work_os);
|
|
_decode_clear(vf);
|
|
return OV_EBADLINK;
|
|
}
|
|
|
|
/* Page granularity seek (faster than sample granularity because we
|
|
don't do the last bit of decode to find a specific sample).
|
|
|
|
Seek to the last [granule marked] page preceeding the specified pos
|
|
location, such that decoding past the returned point will quickly
|
|
arrive at the requested position. */
|
|
int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos){
|
|
int link=-1;
|
|
ogg_int64_t result=0;
|
|
ogg_int64_t total=ov_pcm_total(vf,-1);
|
|
ogg_page og={0,0,0,0};
|
|
ogg_packet op={0,0,0,0,0,0};
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)return(OV_ENOSEEK);
|
|
if(pos<0 || pos>total)return(OV_EINVAL);
|
|
|
|
/* which bitstream section does this pcm offset occur in? */
|
|
for(link=vf->links-1;link>=0;link--){
|
|
total-=vf->pcmlengths[link*2+1];
|
|
if(pos>=total)break;
|
|
}
|
|
|
|
/* search within the logical bitstream for the page with the highest
|
|
pcm_pos preceeding (or equal to) pos. There is a danger here;
|
|
missing pages or incorrect frame number information in the
|
|
bitstream could make our task impossible. Account for that (it
|
|
would be an error condition) */
|
|
|
|
/* new search algorithm by HB (Nicholas Vinen) */
|
|
{
|
|
ogg_int64_t end=vf->offsets[link+1];
|
|
ogg_int64_t begin=vf->offsets[link];
|
|
ogg_int64_t begintime = vf->pcmlengths[link*2];
|
|
ogg_int64_t endtime = vf->pcmlengths[link*2+1]+begintime;
|
|
ogg_int64_t target=pos-total+begintime;
|
|
ogg_int64_t best=begin;
|
|
|
|
while(begin<end){
|
|
ogg_int64_t bisect;
|
|
|
|
if(end-begin<CHUNKSIZE){
|
|
bisect=begin;
|
|
}else{
|
|
/* take a (pretty decent) guess. */
|
|
bisect=begin +
|
|
(target-begintime)*(end-begin)/(endtime-begintime) - CHUNKSIZE;
|
|
if(bisect<=begin)
|
|
bisect=begin+1;
|
|
}
|
|
|
|
_seek_helper(vf,bisect);
|
|
|
|
while(begin<end){
|
|
result=_get_next_page(vf,&og,end-vf->offset);
|
|
if(result==OV_EREAD) goto seek_error;
|
|
if(result<0){
|
|
if(bisect<=begin+1)
|
|
end=begin; /* found it */
|
|
else{
|
|
if(bisect==0) goto seek_error;
|
|
bisect-=CHUNKSIZE;
|
|
if(bisect<=begin)bisect=begin+1;
|
|
_seek_helper(vf,bisect);
|
|
}
|
|
}else{
|
|
ogg_int64_t granulepos=ogg_page_granulepos(&og);
|
|
if(granulepos==-1)continue;
|
|
if(granulepos<target){
|
|
best=result; /* raw offset of packet with granulepos */
|
|
begin=vf->offset; /* raw offset of next page */
|
|
begintime=granulepos;
|
|
|
|
if(target-begintime>44100)break;
|
|
bisect=begin; /* *not* begin + 1 */
|
|
}else{
|
|
if(bisect<=begin+1)
|
|
end=begin; /* found it */
|
|
else{
|
|
if(end==vf->offset){ /* we're pretty close - we'd be stuck in */
|
|
end=result;
|
|
bisect-=CHUNKSIZE; /* an endless loop otherwise. */
|
|
if(bisect<=begin)bisect=begin+1;
|
|
_seek_helper(vf,bisect);
|
|
}else{
|
|
end=result;
|
|
endtime=granulepos;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* found our page. seek to it, update pcm offset. Easier case than
|
|
raw_seek, don't keep packets preceeding granulepos. */
|
|
{
|
|
|
|
/* seek */
|
|
_seek_helper(vf,best);
|
|
vf->pcm_offset=-1;
|
|
|
|
if(_get_next_page(vf,&og,-1)<0){
|
|
ogg_page_release(&og);
|
|
return(OV_EOF); /* shouldn't happen */
|
|
}
|
|
|
|
if(link!=vf->current_link){
|
|
/* Different link; dump entire decode machine */
|
|
_decode_clear(vf);
|
|
|
|
vf->current_link=link;
|
|
vf->current_serialno=ogg_page_serialno(&og);
|
|
vf->ready_state=STREAMSET;
|
|
|
|
}else{
|
|
vorbis_synthesis_restart(&vf->vd);
|
|
}
|
|
|
|
ogg_stream_reset_serialno(vf->os,vf->current_serialno);
|
|
ogg_stream_pagein(vf->os,&og);
|
|
|
|
/* pull out all but last packet; the one with granulepos */
|
|
while(1){
|
|
result=ogg_stream_packetpeek(vf->os,&op);
|
|
if(result==0){
|
|
/* !!! the packet finishing this page originated on a
|
|
preceeding page. Keep fetching previous pages until we
|
|
get one with a granulepos or without the 'continued' flag
|
|
set. Then just use raw_seek for simplicity. */
|
|
|
|
_seek_helper(vf,best);
|
|
|
|
while(1){
|
|
result=_get_prev_page(vf,&og);
|
|
if(result<0) goto seek_error;
|
|
if(ogg_page_granulepos(&og)>-1 ||
|
|
!ogg_page_continued(&og)){
|
|
return ov_raw_seek(vf,result);
|
|
}
|
|
vf->offset=result;
|
|
}
|
|
}
|
|
if(result<0){
|
|
result = OV_EBADPACKET;
|
|
goto seek_error;
|
|
}
|
|
if(op.granulepos!=-1){
|
|
vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2];
|
|
if(vf->pcm_offset<0)vf->pcm_offset=0;
|
|
vf->pcm_offset+=total;
|
|
break;
|
|
}else
|
|
result=ogg_stream_packetout(vf->os,NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* verify result */
|
|
if(vf->pcm_offset>pos || pos>ov_pcm_total(vf,-1)){
|
|
result=OV_EFAULT;
|
|
goto seek_error;
|
|
}
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
|
|
ogg_page_release(&og);
|
|
ogg_packet_release(&op);
|
|
return(0);
|
|
|
|
seek_error:
|
|
|
|
ogg_page_release(&og);
|
|
ogg_packet_release(&op);
|
|
|
|
/* dump machine so we're in a known state */
|
|
vf->pcm_offset=-1;
|
|
_decode_clear(vf);
|
|
return (int)result;
|
|
}
|
|
|
|
/* seek to a sample offset relative to the decompressed pcm stream
|
|
returns zero on success, nonzero on failure */
|
|
|
|
int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos){
|
|
ogg_packet op={0,0,0,0,0,0};
|
|
ogg_page og={0,0,0,0};
|
|
int thisblock,lastblock=0;
|
|
int ret=ov_pcm_seek_page(vf,pos);
|
|
if(ret<0)return(ret);
|
|
_make_decode_ready(vf);
|
|
|
|
/* discard leading packets we don't need for the lapping of the
|
|
position we want; don't decode them */
|
|
|
|
while(1){
|
|
|
|
int ret=ogg_stream_packetpeek(vf->os,&op);
|
|
if(ret>0){
|
|
thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op);
|
|
if(thisblock<0){
|
|
ogg_stream_packetout(vf->os,NULL);
|
|
continue; /* non audio packet */
|
|
}
|
|
if(lastblock)vf->pcm_offset+=(lastblock+thisblock)>>2;
|
|
|
|
if(vf->pcm_offset+((thisblock+
|
|
vorbis_info_blocksize(vf->vi,1))>>2)>=pos)break;
|
|
|
|
/* remove the packet from packet queue and track its granulepos */
|
|
ogg_stream_packetout(vf->os,NULL);
|
|
vorbis_synthesis(&vf->vb,&op,0); /* set up a vb with
|
|
only tracking, no
|
|
pcm_decode */
|
|
vorbis_synthesis_blockin(&vf->vd,&vf->vb);
|
|
|
|
/* end of logical stream case is hard, especially with exact
|
|
length positioning. */
|
|
|
|
if(op.granulepos>-1){
|
|
int i;
|
|
/* always believe the stream markers */
|
|
vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2];
|
|
if(vf->pcm_offset<0)vf->pcm_offset=0;
|
|
for(i=0;i<vf->current_link;i++)
|
|
vf->pcm_offset+=vf->pcmlengths[i*2+1];
|
|
}
|
|
|
|
lastblock=thisblock;
|
|
|
|
}else{
|
|
if(ret<0 && ret!=OV_HOLE)break;
|
|
|
|
/* suck in a new page */
|
|
if(_get_next_page(vf,&og,-1)<0)break;
|
|
if(vf->current_serialno!=ogg_page_serialno(&og))_decode_clear(vf);
|
|
|
|
if(vf->ready_state<STREAMSET){
|
|
int link;
|
|
|
|
vf->current_serialno=ogg_page_serialno(&og);
|
|
for(link=0;link<vf->links;link++)
|
|
if(vf->serialnos[link]==vf->current_serialno)break;
|
|
if(link==vf->links){
|
|
ogg_page_release(&og);
|
|
ogg_packet_release(&op);
|
|
return(OV_EBADLINK);
|
|
}
|
|
vf->current_link=link;
|
|
|
|
ogg_stream_reset_serialno(vf->os,vf->current_serialno);
|
|
vf->ready_state=STREAMSET;
|
|
_make_decode_ready(vf);
|
|
lastblock=0;
|
|
}
|
|
|
|
ogg_stream_pagein(vf->os,&og);
|
|
}
|
|
}
|
|
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
/* discard samples until we reach the desired position. Crossing a
|
|
logical bitstream boundary with abandon is OK. */
|
|
while(vf->pcm_offset<pos){
|
|
ogg_int64_t target=pos-vf->pcm_offset;
|
|
long samples=vorbis_synthesis_pcmout(&vf->vd,NULL);
|
|
|
|
if(samples>target)samples=target;
|
|
vorbis_synthesis_read(&vf->vd,samples);
|
|
vf->pcm_offset+=samples;
|
|
|
|
if(samples<target)
|
|
if(_fetch_and_process_packet(vf,1,1)<=0)
|
|
vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */
|
|
}
|
|
|
|
ogg_page_release(&og);
|
|
ogg_packet_release(&op);
|
|
return 0;
|
|
}
|
|
|
|
/* seek to a playback time relative to the decompressed pcm stream
|
|
returns zero on success, nonzero on failure */
|
|
int ov_time_seek(OggVorbis_File *vf,ogg_int64_t milliseconds){
|
|
/* translate time to PCM position and call ov_pcm_seek */
|
|
|
|
int link=-1;
|
|
ogg_int64_t pcm_total=ov_pcm_total(vf,-1);
|
|
ogg_int64_t time_total=ov_time_total(vf,-1);
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)return(OV_ENOSEEK);
|
|
if(milliseconds<0 || milliseconds>time_total)return(OV_EINVAL);
|
|
|
|
/* which bitstream section does this time offset occur in? */
|
|
for(link=vf->links-1;link>=0;link--){
|
|
pcm_total-=vf->pcmlengths[link*2+1];
|
|
time_total-=ov_time_total(vf,link);
|
|
if(milliseconds>=time_total)break;
|
|
}
|
|
|
|
/* enough information to convert time offset to pcm offset */
|
|
{
|
|
ogg_int64_t target=pcm_total+(milliseconds-time_total)*vf->vi[link].rate/1000;
|
|
return(ov_pcm_seek(vf,target));
|
|
}
|
|
}
|
|
|
|
/* page-granularity version of ov_time_seek
|
|
returns zero on success, nonzero on failure */
|
|
int ov_time_seek_page(OggVorbis_File *vf,ogg_int64_t milliseconds){
|
|
/* translate time to PCM position and call ov_pcm_seek */
|
|
|
|
int link=-1;
|
|
ogg_int64_t pcm_total=ov_pcm_total(vf,-1);
|
|
ogg_int64_t time_total=ov_time_total(vf,-1);
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)return(OV_ENOSEEK);
|
|
if(milliseconds<0 || milliseconds>time_total)return(OV_EINVAL);
|
|
|
|
/* which bitstream section does this time offset occur in? */
|
|
for(link=vf->links-1;link>=0;link--){
|
|
pcm_total-=vf->pcmlengths[link*2+1];
|
|
time_total-=ov_time_total(vf,link);
|
|
if(milliseconds>=time_total)break;
|
|
}
|
|
|
|
/* enough information to convert time offset to pcm offset */
|
|
{
|
|
ogg_int64_t target=pcm_total+(milliseconds-time_total)*vf->vi[link].rate/1000;
|
|
return(ov_pcm_seek_page(vf,target));
|
|
}
|
|
}
|
|
|
|
/* tell the current stream offset cursor. Note that seek followed by
|
|
tell will likely not give the set offset due to caching */
|
|
ogg_int64_t ov_raw_tell(OggVorbis_File *vf){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
return(vf->offset);
|
|
}
|
|
|
|
/* return PCM offset (sample) of next PCM sample to be read */
|
|
ogg_int64_t ov_pcm_tell(OggVorbis_File *vf){
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
return(vf->pcm_offset);
|
|
}
|
|
|
|
/* return time offset (milliseconds) of next PCM sample to be read */
|
|
ogg_int64_t ov_time_tell(OggVorbis_File *vf){
|
|
int link=0;
|
|
ogg_int64_t pcm_total=0;
|
|
ogg_int64_t time_total=0;
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(vf->seekable){
|
|
pcm_total=ov_pcm_total(vf,-1);
|
|
time_total=ov_time_total(vf,-1);
|
|
|
|
/* which bitstream section does this time offset occur in? */
|
|
for(link=vf->links-1;link>=0;link--){
|
|
pcm_total-=vf->pcmlengths[link*2+1];
|
|
time_total-=ov_time_total(vf,link);
|
|
if(vf->pcm_offset>=pcm_total)break;
|
|
}
|
|
}
|
|
|
|
return(time_total+(1000*vf->pcm_offset-pcm_total)/vf->vi[link].rate);
|
|
}
|
|
|
|
/* link: -1) return the vorbis_info struct for the bitstream section
|
|
currently being decoded
|
|
0-n) to request information for a specific bitstream section
|
|
|
|
In the case of a non-seekable bitstream, any call returns the
|
|
current bitstream. NULL in the case that the machine is not
|
|
initialized */
|
|
|
|
vorbis_info *ov_info(OggVorbis_File *vf,int link){
|
|
if(vf->seekable){
|
|
if(link<0)
|
|
if(vf->ready_state>=STREAMSET)
|
|
return vf->vi+vf->current_link;
|
|
else
|
|
return vf->vi;
|
|
else
|
|
if(link>=vf->links)
|
|
return NULL;
|
|
else
|
|
return vf->vi+link;
|
|
}else{
|
|
return vf->vi;
|
|
}
|
|
}
|
|
|
|
/* grr, strong typing, grr, no templates/inheritence, grr */
|
|
vorbis_comment *ov_comment(OggVorbis_File *vf,int link){
|
|
if(vf->seekable){
|
|
if(link<0)
|
|
if(vf->ready_state>=STREAMSET)
|
|
return vf->vc+vf->current_link;
|
|
else
|
|
return vf->vc;
|
|
else
|
|
if(link>=vf->links)
|
|
return NULL;
|
|
else
|
|
return vf->vc+link;
|
|
}else{
|
|
return vf->vc;
|
|
}
|
|
}
|
|
|
|
/* up to this point, everything could more or less hide the multiple
|
|
logical bitstream nature of chaining from the toplevel application
|
|
if the toplevel application didn't particularly care. However, at
|
|
the point that we actually read audio back, the multiple-section
|
|
nature must surface: Multiple bitstream sections do not necessarily
|
|
have to have the same number of channels or sampling rate.
|
|
|
|
ov_read returns the sequential logical bitstream number currently
|
|
being decoded along with the PCM data in order that the toplevel
|
|
application can take action on channel/sample rate changes. This
|
|
number will be incremented even for streamed (non-seekable) streams
|
|
(for seekable streams, it represents the actual logical bitstream
|
|
index within the physical bitstream. Note that the accessor
|
|
functions above are aware of this dichotomy).
|
|
|
|
input values: buffer) a buffer to hold packed PCM data for return
|
|
length) the byte length requested to be placed into buffer
|
|
|
|
return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL)
|
|
0) EOF
|
|
n) number of bytes of PCM actually returned. The
|
|
below works on a packet-by-packet basis, so the
|
|
return length is not related to the 'length' passed
|
|
in, just guaranteed to fit.
|
|
|
|
*section) set to the logical bitstream number */
|
|
|
|
long ov_read(OggVorbis_File *vf,char *buffer,int bytes_req,int *bitstream){
|
|
int i,j;
|
|
|
|
ogg_int32_t **pcm;
|
|
long samples;
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
|
|
while(1){
|
|
if(vf->ready_state==INITSET){
|
|
samples=vorbis_synthesis_pcmout(&vf->vd,&pcm);
|
|
if(samples)break;
|
|
}
|
|
|
|
/* suck in another packet */
|
|
{
|
|
int ret=_fetch_and_process_packet(vf,1,1);
|
|
if(ret==OV_EOF)
|
|
return(0);
|
|
if(ret<=0)
|
|
return(ret);
|
|
}
|
|
|
|
}
|
|
|
|
if(samples>0){
|
|
|
|
/* yay! proceed to pack data into the byte buffer */
|
|
|
|
long channels=ov_info(vf,-1)->channels;
|
|
|
|
if(samples>(bytes_req/(2*channels)))
|
|
samples=bytes_req/(2*channels);
|
|
|
|
for(i=0;i<channels;i++) { /* It's faster in this order */
|
|
ogg_int32_t *src=pcm[i];
|
|
short *dest=((short *)buffer)+i;
|
|
for(j=0;j<samples;j++) {
|
|
*dest=CLIP_TO_15(src[j]>>9);
|
|
dest+=channels;
|
|
}
|
|
}
|
|
|
|
vorbis_synthesis_read(&vf->vd,samples);
|
|
vf->pcm_offset+=samples;
|
|
if(bitstream)*bitstream=vf->current_link;
|
|
return(samples*2*channels);
|
|
}else{
|
|
return(samples);
|
|
}
|
|
}
|