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e39fcc6c7b
Tremor is extremly similar to libogg but only uses integers (and doesn't provide an encoder). The playing problem with libvorbis was probably a float-precision related issue. No need for make build-all.
1968 lines
61 KiB
C
1968 lines
61 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 1994-2014 *
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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: $Id$
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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 "os.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->callbacks.read_func))return(-1);
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if(vf->datasource){
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char *buffer=ogg_sync_buffer(&vf->oy,READSIZE);
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long bytes=(vf->callbacks.read_func)(buffer,1,READSIZE,vf->datasource);
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if(bytes>0)ogg_sync_wrote(&vf->oy,bytes);
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if(bytes==0 && errno)return(-1);
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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 int _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){
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if(vf->datasource){
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/* only seek if the file position isn't already there */
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if(vf->offset != offset){
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if(!(vf->callbacks.seek_func)||
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(vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET) == -1)
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return OV_EREAD;
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vf->offset=offset;
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ogg_sync_reset(&vf->oy);
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}
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}else{
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/* shouldn't happen unless someone writes a broken callback */
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return OV_EFAULT;
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}
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return 0;
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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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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 passed in position. Much
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dirtier than the above as Ogg doesn't have any backward search
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linkage. no 'readp' as it will certainly have to read. */
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/* returns offset or OV_EREAD, OV_FAULT */
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static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_int64_t begin,ogg_page *og){
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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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ret=_seek_helper(vf,begin);
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if(ret)return(ret);
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while(vf->offset<end){
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memset(og,0,sizeof(*og));
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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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/* In a fully compliant, non-multiplexed stream, we'll still be
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holding the last page. In multiplexed (or noncompliant streams),
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we will probably have to re-read the last page we saw */
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if(og->header_len==0){
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ret=_seek_helper(vf,offset);
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if(ret)return(ret);
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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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}
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return(offset);
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}
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static void _add_serialno(ogg_page *og,ogg_uint32_t **serialno_list, int *n){
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ogg_uint32_t s = ogg_page_serialno(og);
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(*n)++;
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if(*serialno_list){
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*serialno_list = _ogg_realloc(*serialno_list, sizeof(**serialno_list)*(*n));
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}else{
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*serialno_list = _ogg_malloc(sizeof(**serialno_list));
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}
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(*serialno_list)[(*n)-1] = s;
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}
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/* returns nonzero if found */
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static int _lookup_serialno(ogg_uint32_t s, ogg_uint32_t *serialno_list, int n){
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if(serialno_list){
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while(n--){
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if(*serialno_list == s) return 1;
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serialno_list++;
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}
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}
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return 0;
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}
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static int _lookup_page_serialno(ogg_page *og, ogg_uint32_t *serialno_list, int n){
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ogg_uint32_t s = ogg_page_serialno(og);
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return _lookup_serialno(s,serialno_list,n);
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}
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/* performs the same search as _get_prev_page, but prefers pages of
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the specified serial number. If a page of the specified serialno is
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spotted during the seek-back-and-read-forward, it will return the
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info of last page of the matching serial number instead of the very
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last page. If no page of the specified serialno is seen, it will
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return the info of last page and alter *serialno. */
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static ogg_int64_t _get_prev_page_serial(OggVorbis_File *vf, ogg_int64_t begin,
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ogg_uint32_t *serial_list, int serial_n,
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int *serialno, ogg_int64_t *granpos){
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ogg_page og;
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ogg_int64_t end=begin;
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ogg_int64_t ret;
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ogg_int64_t prefoffset=-1;
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ogg_int64_t offset=-1;
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ogg_int64_t ret_serialno=-1;
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ogg_int64_t ret_gran=-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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ret=_seek_helper(vf,begin);
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if(ret)return(ret);
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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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ret_serialno=ogg_page_serialno(&og);
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ret_gran=ogg_page_granulepos(&og);
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offset=ret;
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if((ogg_uint32_t)ret_serialno == *serialno){
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prefoffset=ret;
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*granpos=ret_gran;
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}
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if(!_lookup_serialno((ogg_uint32_t)ret_serialno,serial_list,serial_n)){
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/* we fell off the end of the link, which means we seeked
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back too far and shouldn't have been looking in that link
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to begin with. If we found the preferred serial number,
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forget that we saw it. */
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prefoffset=-1;
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}
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}
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}
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}
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/* we're not interested in the page... just the serialno and granpos. */
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if(prefoffset>=0)return(prefoffset);
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*serialno = ret_serialno;
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*granpos = ret_gran;
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return(offset);
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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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static int _fetch_headers(OggVorbis_File *vf,vorbis_info *vi,vorbis_comment *vc,
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ogg_uint32_t **serialno_list, int *serialno_n,
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ogg_page *og_ptr){
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ogg_page og;
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ogg_packet op;
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int i,ret;
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int allbos=0;
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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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vorbis_info_init(vi);
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vorbis_comment_init(vc);
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vf->ready_state=OPENED;
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/* extract the serialnos of all BOS pages + the first set of vorbis
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headers we see in the link */
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while(ogg_page_bos(og_ptr)){
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if(serialno_list){
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if(_lookup_page_serialno(og_ptr,*serialno_list,*serialno_n)){
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/* a dupe serialnumber in an initial header packet set == invalid stream */
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if(*serialno_list)_ogg_free(*serialno_list);
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*serialno_list=0;
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*serialno_n=0;
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ret=OV_EBADHEADER;
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goto bail_header;
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}
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_add_serialno(og_ptr,serialno_list,serialno_n);
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}
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if(vf->ready_state<STREAMSET){
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/* we don't have a vorbis stream in this link yet, so begin
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prospective stream setup. We need a stream to get packets */
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ogg_stream_reset_serialno(&vf->os,ogg_page_serialno(og_ptr));
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ogg_stream_pagein(&vf->os,og_ptr);
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if(ogg_stream_packetout(&vf->os,&op) > 0 &&
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vorbis_synthesis_idheader(&op)){
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/* vorbis header; continue setup */
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vf->ready_state=STREAMSET;
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if((ret=vorbis_synthesis_headerin(vi,vc,&op))){
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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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}
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/* get next page */
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{
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ogg_int64_t llret=_get_next_page(vf,og_ptr,CHUNKSIZE);
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if(llret==OV_EREAD){
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ret=OV_EREAD;
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goto bail_header;
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}
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if(llret<0){
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ret=OV_ENOTVORBIS;
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goto bail_header;
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}
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/* if this page also belongs to our vorbis stream, submit it and break */
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if(vf->ready_state==STREAMSET &&
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vf->os.serialno == ogg_page_serialno(og_ptr)){
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ogg_stream_pagein(&vf->os,og_ptr);
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break;
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}
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}
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}
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if(vf->ready_state!=STREAMSET){
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ret = OV_ENOTVORBIS;
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goto bail_header;
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}
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while(1){
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i=0;
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while(i<2){ /* get a page loop */
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while(i<2){ /* get a packet loop */
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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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i++;
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}
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while(i<2){
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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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/* if this page belongs to the correct stream, go parse it */
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if(vf->os.serialno == ogg_page_serialno(og_ptr)){
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ogg_stream_pagein(&vf->os,og_ptr);
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break;
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}
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/* if we never see the final vorbis headers before the link
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ends, abort */
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if(ogg_page_bos(og_ptr)){
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if(allbos){
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ret = OV_EBADHEADER;
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goto bail_header;
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}else
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allbos=1;
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}
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/* otherwise, keep looking */
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}
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}
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return 0;
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}
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bail_header:
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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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/* Starting from current cursor position, get initial PCM offset of
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next page. Consumes the page in the process without decoding
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audio, however this is only called during stream parsing upon
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seekable open. */
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static ogg_int64_t _initial_pcmoffset(OggVorbis_File *vf, vorbis_info *vi){
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ogg_page og;
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ogg_int64_t accumulated=0;
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long lastblock=-1;
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int result;
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int serialno = vf->os.serialno;
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while(1){
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ogg_packet op;
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if(_get_next_page(vf,&og,-1)<0)
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break; /* should not be possible unless the file is truncated/mangled */
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if(ogg_page_bos(&og)) break;
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if(ogg_page_serialno(&og)!=serialno) continue;
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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(vi,&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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if(ogg_page_granulepos(&og)!=-1){
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/* pcm offset of last packet on the first audio page */
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accumulated= ogg_page_granulepos(&og)-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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return accumulated;
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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_int64_t endgran,
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int endserial,
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ogg_uint32_t *currentno_list,
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int currentnos,
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long m){
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ogg_int64_t pcmoffset;
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ogg_int64_t dataoffset=searched;
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ogg_int64_t endsearched=end;
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ogg_int64_t next=end;
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ogg_int64_t searchgran=-1;
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ogg_page og;
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ogg_int64_t ret,last;
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int serialno = vf->os.serialno;
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/* invariants:
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we have the headers and serialnos for the link beginning at 'begin'
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we have the offset and granpos of the last page in the file (potentially
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not a page we care about)
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*/
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/* Is the last page in our list of current serialnumbers? */
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if(_lookup_serialno(endserial,currentno_list,currentnos)){
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/* last page is in the starting serialno list, so we've bisected
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down to (or just started with) a single link. Now we need to
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find the last vorbis page belonging to the first vorbis stream
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for this link. */
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searched = end;
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while(endserial != serialno){
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endserial = serialno;
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searched=_get_prev_page_serial(vf,searched,currentno_list,currentnos,&endserial,&endgran);
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}
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vf->links=m+1;
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if(vf->offsets)_ogg_free(vf->offsets);
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if(vf->serialnos)_ogg_free(vf->serialnos);
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if(vf->dataoffsets)_ogg_free(vf->dataoffsets);
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vf->offsets=_ogg_malloc((vf->links+1)*sizeof(*vf->offsets));
|
|
vf->vi=_ogg_realloc(vf->vi,vf->links*sizeof(*vf->vi));
|
|
vf->vc=_ogg_realloc(vf->vc,vf->links*sizeof(*vf->vc));
|
|
vf->serialnos=_ogg_malloc(vf->links*sizeof(*vf->serialnos));
|
|
vf->dataoffsets=_ogg_malloc(vf->links*sizeof(*vf->dataoffsets));
|
|
vf->pcmlengths=_ogg_malloc(vf->links*2*sizeof(*vf->pcmlengths));
|
|
|
|
vf->offsets[m+1]=end;
|
|
vf->offsets[m]=begin;
|
|
vf->pcmlengths[m*2+1]=(endgran<0?0:endgran);
|
|
|
|
}else{
|
|
|
|
/* last page is not in the starting stream's serial number list,
|
|
so we have multiple links. Find where the stream that begins
|
|
our bisection ends. */
|
|
|
|
ogg_uint32_t *next_serialno_list=NULL;
|
|
int next_serialnos=0;
|
|
vorbis_info vi;
|
|
vorbis_comment vc;
|
|
int testserial = serialno+1;
|
|
|
|
/* the below guards against garbage seperating the last and
|
|
first pages of two links. */
|
|
while(searched<endsearched){
|
|
ogg_int64_t bisect;
|
|
|
|
if(endsearched-searched<CHUNKSIZE){
|
|
bisect=searched;
|
|
}else{
|
|
bisect=(searched+endsearched)/2;
|
|
}
|
|
|
|
ret=_seek_helper(vf,bisect);
|
|
if(ret)return(ret);
|
|
|
|
last=_get_next_page(vf,&og,-1);
|
|
if(last==OV_EREAD)return(OV_EREAD);
|
|
if(last<0 || !_lookup_page_serialno(&og,currentno_list,currentnos)){
|
|
endsearched=bisect;
|
|
if(last>=0)next=last;
|
|
}else{
|
|
searched=vf->offset;
|
|
}
|
|
}
|
|
|
|
/* Bisection point found */
|
|
/* for the time being, fetch end PCM offset the simple way */
|
|
searched = next;
|
|
while(testserial != serialno){
|
|
testserial = serialno;
|
|
searched = _get_prev_page_serial(vf,searched,currentno_list,currentnos,&testserial,&searchgran);
|
|
}
|
|
|
|
ret=_seek_helper(vf,next);
|
|
if(ret)return(ret);
|
|
|
|
ret=_fetch_headers(vf,&vi,&vc,&next_serialno_list,&next_serialnos,NULL);
|
|
if(ret)return(ret);
|
|
serialno = vf->os.serialno;
|
|
dataoffset = vf->offset;
|
|
|
|
/* this will consume a page, however the next bisection always
|
|
starts with a raw seek */
|
|
pcmoffset = _initial_pcmoffset(vf,&vi);
|
|
|
|
ret=_bisect_forward_serialno(vf,next,vf->offset,end,endgran,endserial,
|
|
next_serialno_list,next_serialnos,m+1);
|
|
if(ret)return(ret);
|
|
|
|
if(next_serialno_list)_ogg_free(next_serialno_list);
|
|
|
|
vf->offsets[m+1]=next;
|
|
vf->serialnos[m+1]=serialno;
|
|
vf->dataoffsets[m+1]=dataoffset;
|
|
|
|
vf->vi[m+1]=vi;
|
|
vf->vc[m+1]=vc;
|
|
|
|
vf->pcmlengths[m*2+1]=searchgran;
|
|
vf->pcmlengths[m*2+2]=pcmoffset;
|
|
vf->pcmlengths[m*2+3]-=pcmoffset;
|
|
if(vf->pcmlengths[m*2+3]<0)vf->pcmlengths[m*2+3]=0;
|
|
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int _make_decode_ready(OggVorbis_File *vf){
|
|
if(vf->ready_state>STREAMSET)return 0;
|
|
if(vf->ready_state<STREAMSET)return OV_EFAULT;
|
|
if(vf->seekable){
|
|
if(vorbis_synthesis_init(&vf->vd,vf->vi+vf->current_link))
|
|
return OV_EBADLINK;
|
|
}else{
|
|
if(vorbis_synthesis_init(&vf->vd,vf->vi))
|
|
return OV_EBADLINK;
|
|
}
|
|
vorbis_block_init(&vf->vd,&vf->vb);
|
|
vf->ready_state=INITSET;
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
return 0;
|
|
}
|
|
|
|
static int _open_seekable2(OggVorbis_File *vf){
|
|
ogg_int64_t dataoffset=vf->dataoffsets[0],end,endgran=-1;
|
|
int endserial=vf->os.serialno;
|
|
int serialno=vf->os.serialno;
|
|
|
|
/* we're partially open and have a first link header state in
|
|
storage in vf */
|
|
|
|
/* fetch initial PCM offset */
|
|
ogg_int64_t pcmoffset = _initial_pcmoffset(vf,vf->vi);
|
|
|
|
/* we can seek, so set out learning all about this file */
|
|
if(vf->callbacks.seek_func && vf->callbacks.tell_func){
|
|
(vf->callbacks.seek_func)(vf->datasource,0,SEEK_END);
|
|
vf->offset=vf->end=(vf->callbacks.tell_func)(vf->datasource);
|
|
}else{
|
|
vf->offset=vf->end=-1;
|
|
}
|
|
|
|
/* If seek_func is implemented, tell_func must also be implemented */
|
|
if(vf->end==-1) return(OV_EINVAL);
|
|
|
|
/* Get the offset of the last page of the physical bitstream, or, if
|
|
we're lucky the last vorbis page of this link as most OggVorbis
|
|
files will contain a single logical bitstream */
|
|
end=_get_prev_page_serial(vf,vf->end,vf->serialnos+2,vf->serialnos[1],&endserial,&endgran);
|
|
if(end<0)return(end);
|
|
|
|
/* now determine bitstream structure recursively */
|
|
if(_bisect_forward_serialno(vf,0,dataoffset,end,endgran,endserial,
|
|
vf->serialnos+2,vf->serialnos[1],0)<0)return(OV_EREAD);
|
|
|
|
vf->offsets[0]=0;
|
|
vf->serialnos[0]=serialno;
|
|
vf->dataoffsets[0]=dataoffset;
|
|
vf->pcmlengths[0]=pcmoffset;
|
|
vf->pcmlengths[1]-=pcmoffset;
|
|
if(vf->pcmlengths[1]<0)vf->pcmlengths[1]=0;
|
|
|
|
return(ov_raw_seek(vf,dataoffset));
|
|
}
|
|
|
|
/* clear out the current logical bitstream decoder */
|
|
static void _decode_clear(OggVorbis_File *vf){
|
|
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,
|
|
ogg_packet *op_in,
|
|
int readp,
|
|
int spanp){
|
|
ogg_page og;
|
|
|
|
/* handle one packet. Try to fetch it from current stream state */
|
|
/* extract packets from page */
|
|
while(1){
|
|
|
|
if(vf->ready_state==STREAMSET){
|
|
int ret=_make_decode_ready(vf);
|
|
if(ret<0)return ret;
|
|
}
|
|
|
|
/* process a packet if we can. If the machine isn't loaded,
|
|
neither is a page */
|
|
if(vf->ready_state==INITSET){
|
|
while(1) {
|
|
ogg_packet op;
|
|
ogg_packet *op_ptr=(op_in?op_in:&op);
|
|
int result=ogg_stream_packetout(&vf->os,op_ptr);
|
|
ogg_int64_t granulepos;
|
|
|
|
op_in=NULL;
|
|
if(result==-1)return(OV_HOLE); /* hole in the data. */
|
|
if(result>0){
|
|
/* got a packet. process it */
|
|
granulepos=op_ptr->granulepos;
|
|
if(!vorbis_synthesis(&vf->vb,op_ptr)){ /* 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)return(OV_EFAULT);
|
|
|
|
vorbis_synthesis_blockin(&vf->vd,&vf->vb);
|
|
vf->samptrack+=vorbis_synthesis_pcmout(&vf->vd,NULL);
|
|
vf->bittrack+=op_ptr->bytes*8;
|
|
}
|
|
|
|
/* update the pcm offset. */
|
|
if(granulepos!=-1 && !op_ptr->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_ptr->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;
|
|
}
|
|
return(1);
|
|
}
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(vf->ready_state>=OPENED){
|
|
ogg_int64_t ret;
|
|
|
|
while(1){
|
|
/* the loop is not strictly necessary, but there's no sense in
|
|
doing the extra checks of the larger loop for the common
|
|
case in a multiplexed bistream where the page is simply
|
|
part of a different logical bitstream; keep reading until
|
|
we get one with the correct serialno */
|
|
|
|
if(!readp)return(0);
|
|
if((ret=_get_next_page(vf,&og,-1))<0){
|
|
return(OV_EOF); /* eof. leave unitialized */
|
|
}
|
|
|
|
/* bitrate tracking; add the header's bytes here, the body bytes
|
|
are done by packet above */
|
|
vf->bittrack+=og.header_len*8;
|
|
|
|
if(vf->ready_state==INITSET){
|
|
if(vf->current_serialno!=ogg_page_serialno(&og)){
|
|
|
|
/* two possibilities:
|
|
1) our decoding just traversed a bitstream boundary
|
|
2) another stream is multiplexed into this logical section */
|
|
|
|
if(ogg_page_bos(&og)){
|
|
/* boundary case */
|
|
if(!spanp)
|
|
return(OV_EOF);
|
|
|
|
_decode_clear(vf);
|
|
|
|
if(!vf->seekable){
|
|
vorbis_info_clear(vf->vi);
|
|
vorbis_comment_clear(vf->vc);
|
|
}
|
|
break;
|
|
|
|
}else
|
|
continue; /* possibility #2 */
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 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){
|
|
ogg_uint32_t 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]==serialno)break;
|
|
|
|
if(link==vf->links) continue; /* not the desired Vorbis
|
|
bitstream section; keep
|
|
trying */
|
|
|
|
vf->current_serialno=serialno;
|
|
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,NULL,NULL,&og);
|
|
if(ret)return(ret);
|
|
vf->current_serialno=vf->os.serialno;
|
|
vf->current_link++;
|
|
link=0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* the buffered page is the data we want, and we're ready for it;
|
|
add it to the stream state */
|
|
ogg_stream_pagein(&vf->os,&og);
|
|
|
|
}
|
|
}
|
|
|
|
/* 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,const char *initial,
|
|
long ibytes, ov_callbacks callbacks){
|
|
int offsettest=((f && callbacks.seek_func)?callbacks.seek_func(f,0,SEEK_CUR):-1);
|
|
ogg_uint32_t *serialno_list=NULL;
|
|
int serialno_list_size=0;
|
|
int ret;
|
|
|
|
memset(vf,0,sizeof(*vf));
|
|
vf->datasource=f;
|
|
vf->callbacks = callbacks;
|
|
|
|
/* init the framing state */
|
|
ogg_sync_init(&vf->oy);
|
|
|
|
/* perhaps some data was previously read into a buffer for testing
|
|
against other stream types. Allow initialization from this
|
|
previously read data (especially as we may be reading from a
|
|
non-seekable stream) */
|
|
if(initial){
|
|
char *buffer=ogg_sync_buffer(&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));
|
|
ogg_stream_init(&vf->os,-1); /* fill in the serialno later */
|
|
|
|
/* Fetch all BOS pages, store the vorbis header and all seen serial
|
|
numbers, load subsequent vorbis setup headers */
|
|
if((ret=_fetch_headers(vf,vf->vi,vf->vc,&serialno_list,&serialno_list_size,NULL))<0){
|
|
vf->datasource=NULL;
|
|
ov_clear(vf);
|
|
}else{
|
|
/* serial number list for first link needs to be held somewhere
|
|
for second stage of seekable stream open; this saves having to
|
|
seek/reread first link's serialnumber data then. */
|
|
vf->serialnos=_ogg_calloc(serialno_list_size+2,sizeof(*vf->serialnos));
|
|
vf->serialnos[0]=vf->current_serialno=vf->os.serialno;
|
|
vf->serialnos[1]=serialno_list_size;
|
|
memcpy(vf->serialnos+2,serialno_list,serialno_list_size*sizeof(*vf->serialnos));
|
|
|
|
vf->offsets=_ogg_calloc(1,sizeof(*vf->offsets));
|
|
vf->dataoffsets=_ogg_calloc(1,sizeof(*vf->dataoffsets));
|
|
vf->offsets[0]=0;
|
|
vf->dataoffsets[0]=vf->offset;
|
|
|
|
vf->ready_state=PARTOPEN;
|
|
}
|
|
if(serialno_list)_ogg_free(serialno_list);
|
|
return(ret);
|
|
}
|
|
|
|
static int _ov_open2(OggVorbis_File *vf){
|
|
if(vf->ready_state != PARTOPEN) return OV_EINVAL;
|
|
vf->ready_state=OPENED;
|
|
if(vf->seekable){
|
|
int ret=_open_seekable2(vf);
|
|
if(ret){
|
|
vf->datasource=NULL;
|
|
ov_clear(vf);
|
|
}
|
|
return(ret);
|
|
}else
|
|
vf->ready_state=STREAMSET;
|
|
|
|
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_clear(&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_clear(&vf->oy);
|
|
if(vf->datasource && vf->callbacks.close_func)
|
|
(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,
|
|
const 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,const 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);
|
|
}
|
|
|
|
int ov_fopen(const char *path,OggVorbis_File *vf){
|
|
int ret;
|
|
FILE *f = fopen(path,"rb");
|
|
if(!f) return -1;
|
|
|
|
ret = ov_open(f,vf,NULL,0);
|
|
if(ret) fclose(f);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* 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,
|
|
const char *initial,long ibytes,ov_callbacks callbacks)
|
|
{
|
|
return _ov_open1(f,vf,initial,ibytes,callbacks);
|
|
}
|
|
|
|
int ov_test(FILE *f,OggVorbis_File *vf,const 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;
|
|
int ret;
|
|
|
|
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);
|
|
|
|
/* is the seek position outside our current link [if any]? */
|
|
if(vf->ready_state>=STREAMSET){
|
|
if(pos<vf->offsets[vf->current_link] || pos>=vf->offsets[vf->current_link+1])
|
|
_decode_clear(vf); /* clear out stream state */
|
|
}
|
|
|
|
/* 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);
|
|
|
|
ret=_seek_helper(vf,pos);
|
|
if(ret)goto seek_error;
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
{
|
|
ogg_page og;
|
|
ogg_packet op;
|
|
int lastblock=0;
|
|
int accblock=0;
|
|
int thisblock=0;
|
|
int lastflag=0;
|
|
int firstflag=0;
|
|
ogg_int64_t pagepos=-1;
|
|
|
|
ogg_stream_init(&work_os,vf->current_serialno); /* get the memory ready */
|
|
ogg_stream_reset(&work_os); /* eliminate the spurious OV_HOLE
|
|
return from not necessarily
|
|
starting from the beginning */
|
|
|
|
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{
|
|
|
|
/* We can't get a guaranteed correct pcm position out of the
|
|
last page in a stream because it might have a 'short'
|
|
granpos, which can only be detected in the presence of a
|
|
preceding page. However, if the last page is also the first
|
|
page, the granpos rules of a first page take precedence. Not
|
|
only that, but for first==last, the EOS page must be treated
|
|
as if its a normal first page for the stream to open/play. */
|
|
if(lastflag && !firstflag)
|
|
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;
|
|
if(vf->pcm_offset<0)vf->pcm_offset=0;
|
|
break;
|
|
}
|
|
lastblock=thisblock;
|
|
continue;
|
|
}else
|
|
ogg_stream_packetout(&vf->os,NULL);
|
|
}
|
|
}
|
|
|
|
if(!lastblock){
|
|
pagepos=_get_next_page(vf,&og,-1);
|
|
if(pagepos<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)){
|
|
|
|
/* two possibilities:
|
|
1) our decoding just traversed a bitstream boundary
|
|
2) another stream is multiplexed into this logical section? */
|
|
|
|
if(ogg_page_bos(&og)){
|
|
/* we traversed */
|
|
_decode_clear(vf); /* clear out stream state */
|
|
ogg_stream_clear(&work_os);
|
|
} /* else, do nothing; next loop will scoop another page */
|
|
}
|
|
}
|
|
|
|
if(vf->ready_state<STREAMSET){
|
|
int link;
|
|
ogg_uint32_t serialno = ogg_page_serialno(&og);
|
|
|
|
for(link=0;link<vf->links;link++)
|
|
if(vf->serialnos[link]==serialno)break;
|
|
|
|
if(link==vf->links) continue; /* not the desired Vorbis
|
|
bitstream section; keep
|
|
trying */
|
|
vf->current_link=link;
|
|
vf->current_serialno=serialno;
|
|
ogg_stream_reset_serialno(&vf->os,serialno);
|
|
ogg_stream_reset_serialno(&work_os,serialno);
|
|
vf->ready_state=STREAMSET;
|
|
firstflag=(pagepos<=vf->dataoffsets[link]);
|
|
}
|
|
|
|
ogg_stream_pagein(&vf->os,&og);
|
|
ogg_stream_pagein(&work_os,&og);
|
|
lastflag=ogg_page_eos(&og);
|
|
|
|
}
|
|
}
|
|
|
|
ogg_stream_clear(&work_os);
|
|
vf->bittrack=0;
|
|
vf->samptrack=0;
|
|
return(0);
|
|
|
|
seek_error:
|
|
/* dump the machine so we're in a known state */
|
|
vf->pcm_offset=-1;
|
|
ogg_stream_clear(&work_os);
|
|
_decode_clear(vf);
|
|
return OV_EBADLINK;
|
|
}
|
|
|
|
/* rescales the number x from the range of [0,from] to [0,to]
|
|
x is in the range [0,from]
|
|
from, to are in the range [1, 1<<62-1] */
|
|
ogg_int64_t rescale64(ogg_int64_t x, ogg_int64_t from, ogg_int64_t to){
|
|
ogg_int64_t frac=0;
|
|
ogg_int64_t ret=0;
|
|
int i;
|
|
if(x >= from) return to;
|
|
if(x <= 0) return 0;
|
|
|
|
for(i=0;i<64;i++){
|
|
if(x>=from){
|
|
frac|=1;
|
|
x-=from;
|
|
}
|
|
x<<=1;
|
|
frac<<=1;
|
|
}
|
|
|
|
for(i=0;i<64;i++){
|
|
if(frac & 1){
|
|
ret+=to;
|
|
}
|
|
frac>>=1;
|
|
ret>>=1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* 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 preceding 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);
|
|
|
|
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 preceding pos. If we're looking for a position on the
|
|
first page, bisection will halt without finding our position as
|
|
it's before the first explicit granulepos fencepost. That case is
|
|
handled separately below.
|
|
|
|
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 originally by HB (Nicholas Vinen) */
|
|
|
|
{
|
|
ogg_int64_t end=vf->offsets[link+1];
|
|
ogg_int64_t begin=vf->dataoffsets[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=-1;
|
|
int got_page=0;
|
|
|
|
ogg_page og;
|
|
|
|
/* if we have only one page, there will be no bisection. Grab the page here */
|
|
if(begin==end){
|
|
result=_seek_helper(vf,begin);
|
|
if(result) goto seek_error;
|
|
|
|
result=_get_next_page(vf,&og,1);
|
|
if(result<0) goto seek_error;
|
|
|
|
got_page=1;
|
|
}
|
|
|
|
/* bisection loop */
|
|
while(begin<end){
|
|
ogg_int64_t bisect;
|
|
|
|
if(end-begin<CHUNKSIZE){
|
|
bisect=begin;
|
|
}else{
|
|
/* take a (pretty decent) guess. */
|
|
bisect=begin + rescale64(target-begintime,
|
|
endtime-begintime,
|
|
end-begin) - CHUNKSIZE;
|
|
if(bisect<begin+CHUNKSIZE)
|
|
bisect=begin;
|
|
}
|
|
|
|
result=_seek_helper(vf,bisect);
|
|
if(result) goto seek_error;
|
|
|
|
/* read loop within the bisection loop */
|
|
while(begin<end){
|
|
result=_get_next_page(vf,&og,end-vf->offset);
|
|
if(result==OV_EREAD) goto seek_error;
|
|
if(result<0){
|
|
/* there is no next page! */
|
|
if(bisect<=begin+1)
|
|
/* No bisection left to perform. We've either found the
|
|
best candidate already or failed. Exit loop. */
|
|
end=begin;
|
|
else{
|
|
/* We tried to load a fraction of the last page; back up a
|
|
bit and try to get the whole last page */
|
|
if(bisect==0) goto seek_error;
|
|
bisect-=CHUNKSIZE;
|
|
|
|
/* don't repeat/loop on a read we've already performed */
|
|
if(bisect<=begin)bisect=begin+1;
|
|
|
|
/* seek and continue bisection */
|
|
result=_seek_helper(vf,bisect);
|
|
if(result) goto seek_error;
|
|
}
|
|
}else{
|
|
ogg_int64_t granulepos;
|
|
got_page=1;
|
|
|
|
/* got a page. analyze it */
|
|
/* only consider pages from primary vorbis stream */
|
|
if(ogg_page_serialno(&og)!=vf->serialnos[link])
|
|
continue;
|
|
|
|
/* only consider pages with the granulepos set */
|
|
granulepos=ogg_page_granulepos(&og);
|
|
if(granulepos==-1)continue;
|
|
|
|
if(granulepos<target){
|
|
/* this page is a successful candidate! Set state */
|
|
|
|
best=result; /* raw offset of packet with granulepos */
|
|
begin=vf->offset; /* raw offset of next page */
|
|
begintime=granulepos;
|
|
|
|
/* if we're before our target but within a short distance,
|
|
don't bisect; read forward */
|
|
if(target-begintime>44100)break;
|
|
|
|
bisect=begin; /* *not* begin + 1 as above */
|
|
}else{
|
|
|
|
/* This is one of our pages, but the granpos is
|
|
post-target; it is not a bisection return
|
|
candidate. (The only way we'd use it is if it's the
|
|
first page in the stream; we handle that case later
|
|
outside the bisection) */
|
|
if(bisect<=begin+1){
|
|
/* No bisection left to perform. We've either found the
|
|
best candidate already or failed. Exit loop. */
|
|
end=begin;
|
|
}else{
|
|
if(end==vf->offset){
|
|
/* bisection read to the end; use the known page
|
|
boundary (result) to update bisection, back up a
|
|
little bit, and try again */
|
|
end=result;
|
|
bisect-=CHUNKSIZE;
|
|
if(bisect<=begin)bisect=begin+1;
|
|
result=_seek_helper(vf,bisect);
|
|
if(result) goto seek_error;
|
|
}else{
|
|
/* Normal bisection */
|
|
end=bisect;
|
|
endtime=granulepos;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Out of bisection: did it 'fail?' */
|
|
if(best == -1){
|
|
|
|
/* Check the 'looking for data in first page' special case;
|
|
bisection would 'fail' because our search target was before the
|
|
first PCM granule position fencepost. */
|
|
|
|
if(got_page &&
|
|
begin == vf->dataoffsets[link] &&
|
|
ogg_page_serialno(&og)==vf->serialnos[link]){
|
|
|
|
/* Yes, this is the beginning-of-stream case. We already have
|
|
our page, right at the beginning of PCM data. Set state
|
|
and return. */
|
|
|
|
vf->pcm_offset=total;
|
|
|
|
if(link!=vf->current_link){
|
|
/* Different link; dump entire decode machine */
|
|
_decode_clear(vf);
|
|
|
|
vf->current_link=link;
|
|
vf->current_serialno=vf->serialnos[link];
|
|
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);
|
|
|
|
}else
|
|
goto seek_error;
|
|
|
|
}else{
|
|
|
|
/* Bisection found our page. seek to it, update pcm offset. Easier case than
|
|
raw_seek, don't keep packets preceding granulepos. */
|
|
|
|
ogg_page og;
|
|
ogg_packet op;
|
|
|
|
/* seek */
|
|
result=_seek_helper(vf,best);
|
|
vf->pcm_offset=-1;
|
|
if(result) goto seek_error;
|
|
result=_get_next_page(vf,&og,-1);
|
|
if(result<0) goto seek_error;
|
|
|
|
if(link!=vf->current_link){
|
|
/* Different link; dump entire decode machine */
|
|
_decode_clear(vf);
|
|
|
|
vf->current_link=link;
|
|
vf->current_serialno=vf->serialnos[link];
|
|
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){
|
|
/* No packet returned; we exited the bisection with 'best'
|
|
pointing to a page with a granule position, so the packet
|
|
finishing this page ('best') originated on a preceding
|
|
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. */
|
|
/* Do not rewind past the beginning of link data; if we do,
|
|
it's either a bug or a broken stream */
|
|
result=best;
|
|
while(result>vf->dataoffsets[link]){
|
|
result=_get_prev_page(vf,result,&og);
|
|
if(result<0) goto seek_error;
|
|
if(ogg_page_serialno(&og)==vf->current_serialno &&
|
|
(ogg_page_granulepos(&og)>-1 ||
|
|
!ogg_page_continued(&og))){
|
|
return ov_raw_seek(vf,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;
|
|
return(0);
|
|
|
|
seek_error:
|
|
/* 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){
|
|
int thisblock,lastblock=0;
|
|
int ret=ov_pcm_seek_page(vf,pos);
|
|
if(ret<0)return(ret);
|
|
if((ret=_make_decode_ready(vf)))return ret;
|
|
|
|
/* discard leading packets we don't need for the lapping of the
|
|
position we want; don't decode them */
|
|
|
|
while(1){
|
|
ogg_packet op;
|
|
ogg_page og;
|
|
|
|
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_trackonly(&vf->vb,&op); /* 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(ogg_page_bos(&og))_decode_clear(vf);
|
|
|
|
if(vf->ready_state<STREAMSET){
|
|
ogg_uint32_t serialno=ogg_page_serialno(&og);
|
|
int link;
|
|
|
|
for(link=0;link<vf->links;link++)
|
|
if(vf->serialnos[link]==serialno)break;
|
|
if(link==vf->links) continue;
|
|
vf->current_link=link;
|
|
|
|
vf->ready_state=STREAMSET;
|
|
vf->current_serialno=ogg_page_serialno(&og);
|
|
ogg_stream_reset_serialno(&vf->os,serialno);
|
|
ret=_make_decode_ready(vf);
|
|
if(ret)return ret;
|
|
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,NULL,1,1)<=0)
|
|
vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */
|
|
}
|
|
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=0;
|
|
ogg_int64_t time_total=0;
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)return(OV_ENOSEEK);
|
|
if(milliseconds<0)return(OV_EINVAL);
|
|
|
|
/* which bitstream section does this time offset occur in? */
|
|
for(link=0;link<vf->links;link++){
|
|
ogg_int64_t addsec = ov_time_total(vf,link);
|
|
if(milliseconds<time_total+addsec)break;
|
|
time_total+=addsec;
|
|
pcm_total+=vf->pcmlengths[link*2+1];
|
|
}
|
|
|
|
if(link==vf->links)return(OV_EINVAL);
|
|
|
|
/* 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=0;
|
|
ogg_int64_t time_total=0;
|
|
|
|
if(vf->ready_state<OPENED)return(OV_EINVAL);
|
|
if(!vf->seekable)return(OV_ENOSEEK);
|
|
if(milliseconds<0)return(OV_EINVAL);
|
|
|
|
/* which bitstream section does this time offset occur in? */
|
|
for(link=0;link<vf->links;link++){
|
|
ogg_int64_t addsec = ov_time_total(vf,link);
|
|
if(milliseconds<time_total+addsec)break;
|
|
time_total+=addsec;
|
|
pcm_total+=vf->pcmlengths[link*2+1];
|
|
}
|
|
|
|
if(link==vf->links)return(OV_EINVAL);
|
|
|
|
/* 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
|
|
bytes_req) 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,NULL,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);
|
|
}
|
|
}
|