* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
- * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
#include <math.h>
#include "vorbis/codec.h"
+
+/* we don't need or want the static callback symbols here */
+#define OV_EXCLUDE_STATIC_CALLBACKS
#include "vorbis/vorbisfile.h"
#include "os.h"
we only want coarse navigation through the stream. */
/*************************************************************************
- * Many, many internal helpers. The intention is not to be confusing;
- * rampant duplication and monolithic function implementation would be
+ * Many, many internal helpers. The intention is not to be confusing;
+ * rampant duplication and monolithic function implementation would be
* harder to understand anyway. The high level functions are last. Begin
* grokking near the end of the file */
/* read a little more data from the file/pipe into the ogg_sync framer
*/
-#define CHUNKSIZE 65536
+#define CHUNKSIZE 65536 /* greater-than-page-size granularity seeking */
+#define READSIZE 2048 /* a smaller read size is needed for low-rate streaming. */
static long _get_data(OggVorbis_File *vf){
errno=0;
if(!(vf->callbacks.read_func))return(-1);
if(vf->datasource){
- char *buffer=ogg_sync_buffer(&vf->oy,CHUNKSIZE);
- long bytes=(vf->callbacks.read_func)(buffer,1,CHUNKSIZE,vf->datasource);
+ char *buffer=ogg_sync_buffer(&vf->oy,READSIZE);
+ long bytes=(vf->callbacks.read_func)(buffer,1,READSIZE,vf->datasource);
if(bytes>0)ogg_sync_wrote(&vf->oy,bytes);
if(bytes==0 && errno)return(-1);
return(bytes);
/* save a tiny smidge of verbosity to make the code more readable */
static int _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){
- if(vf->datasource){
+ if(vf->datasource){
if(!(vf->callbacks.seek_func)||
(vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET) == -1)
return OV_EREAD;
boundary: -1) unbounded search
0) read no additional data; use cached only
- n) search for a new page beginning for n bytes
+ n) search for a new page beginning for n bytes
return: <0) did not find a page (OV_FALSE, OV_EOF, OV_EREAD)
n) found a page at absolute offset n */
static ogg_int64_t _get_next_page(OggVorbis_File *vf,ogg_page *og,
- ogg_int64_t boundary){
+ ogg_int64_t boundary){
if(boundary>0)boundary+=vf->offset;
while(1){
long more;
if(boundary>0 && vf->offset>=boundary)return(OV_FALSE);
more=ogg_sync_pageseek(&vf->oy,og);
-
+
if(more<0){
/* skipped n bytes */
vf->offset-=more;
}else{
if(more==0){
- /* send more paramedics */
- if(!boundary)return(OV_FALSE);
- {
- long ret=_get_data(vf);
- if(ret==0)return(OV_EOF);
- if(ret<0)return(OV_EREAD);
- }
+ /* send more paramedics */
+ if(!boundary)return(OV_FALSE);
+ {
+ long ret=_get_data(vf);
+ if(ret==0)return(OV_EOF);
+ if(ret<0)return(OV_EREAD);
+ }
}else{
- /* got a page. Return the offset at the page beginning,
+ /* got a page. Return the offset at the page beginning,
advance the internal offset past the page end */
- ogg_int64_t ret=vf->offset;
- vf->offset+=more;
- return(ret);
-
+ ogg_int64_t ret=vf->offset;
+ vf->offset+=more;
+ return(ret);
+
}
}
}
ret=_get_next_page(vf,og,end-vf->offset);
if(ret==OV_EREAD)return(OV_EREAD);
if(ret<0){
- break;
+ break;
}else{
- offset=ret;
+ offset=ret;
}
}
}
return(offset);
}
+static void _add_serialno(ogg_page *og,long **serialno_list, int *n){
+ long s = ogg_page_serialno(og);
+ (*n)++;
+
+ if(*serialno_list){
+ *serialno_list = _ogg_realloc(*serialno_list, sizeof(**serialno_list)*(*n));
+ }else{
+ *serialno_list = _ogg_malloc(sizeof(**serialno_list));
+ }
+
+ (*serialno_list)[(*n)-1] = s;
+}
+
+/* returns nonzero if found */
+static int _lookup_serialno(long s, long *serialno_list, int n){
+ if(serialno_list){
+ while(n--){
+ if(*serialno_list == s) return 1;
+ serialno_list++;
+ }
+ }
+ return 0;
+}
+
+static int _lookup_page_serialno(ogg_page *og, long *serialno_list, int n){
+ long s = ogg_page_serialno(og);
+ return _lookup_serialno(s,serialno_list,n);
+}
+
/* performs the same search as _get_prev_page, but prefers pages of
the specified serial number. If a page of the specified serialno is
spotted during the seek-back-and-read-forward, it will return the
info of last page of the matching serial number instead of the very
last page. If no page of the specified serialno is seen, it will
return the info of last page and alter *serialno. */
-static ogg_int64_t _get_prev_page_serial(OggVorbis_File *vf,int *serialno, ogg_int64_t *granpos){
+static ogg_int64_t _get_prev_page_serial(OggVorbis_File *vf,
+ long *serial_list, int serial_n,
+ int *serialno, ogg_int64_t *granpos){
ogg_page og;
ogg_int64_t begin=vf->offset;
ogg_int64_t end=begin;
ogg_int64_t prefoffset=-1;
ogg_int64_t offset=-1;
- ogg_int64_t ret_serialno;
- ogg_int64_t ret_gran;
+ ogg_int64_t ret_serialno=-1;
+ ogg_int64_t ret_gran=-1;
while(offset==-1){
begin-=CHUNKSIZE;
ret=_get_next_page(vf,&og,end-vf->offset);
if(ret==OV_EREAD)return(OV_EREAD);
if(ret<0){
- break;
+ break;
}else{
- ret_serialno=ogg_page_serialno(&og);
- ret_gran=ogg_page_granulepos(&og);
- offset=ret;
-
- if(ret_serialno == *serialno){
- prefoffset=ret;
- *granpos=ret_gran;
- }
+ ret_serialno=ogg_page_serialno(&og);
+ ret_gran=ogg_page_granulepos(&og);
+ offset=ret;
+
+ if(ret_serialno == *serialno){
+ prefoffset=ret;
+ *granpos=ret_gran;
+ }
+
+ if(!_lookup_serialno(ret_serialno,serial_list,serial_n)){
+ /* we fell off the end of the link, which means we seeked
+ back too far and shouldn't have been looking in that link
+ to begin with. If we found the preferred serial number,
+ forget that we saw it. */
+ prefoffset=-1;
+ }
}
}
}
}
-static void _add_serialno(ogg_page *og,long **serialno_list, int *n){
- long s = ogg_page_serialno(og);
- (*n)++;
-
- if(serialno_list){
- *serialno_list = _ogg_realloc(*serialno_list, sizeof(*serialno_list)*(*n));
- }else{
- *serialno_list = _ogg_malloc(sizeof(**serialno_list));
- }
-
- (*serialno_list)[(*n)-1] = s;
-}
-
-/* returns nonzero if found */
-static int _lookup_serialno(long s, long *serialno_list, int n){
- if(serialno_list){
- while(n--){
- if(*serialno_list == s) return 1;
- serialno_list++;
- }
- }
- return 0;
-}
-
-static int _lookup_page_serialno(ogg_page *og, long *serialno_list, int n){
- long s = ogg_page_serialno(og);
- return _lookup_serialno(s,serialno_list,n);
-}
-
/* uses the local ogg_stream storage in vf; this is important for
non-streaming input sources */
static int _fetch_headers(OggVorbis_File *vf,vorbis_info *vi,vorbis_comment *vc,
- long **serialno_list, int *serialno_n,
+ long **serialno_list, int *serialno_n,
ogg_page *og_ptr){
ogg_page og;
ogg_packet op;
ret=OV_EBADHEADER;
goto bail_header;
}
-
+
_add_serialno(og_ptr,serialno_list,serialno_n);
}
}
/* if this page also belongs to our vorbis stream, submit it and break */
- if(vf->ready_state==STREAMSET &&
+ if(vf->ready_state==STREAMSET &&
vf->os.serialno == ogg_page_serialno(og_ptr)){
ogg_stream_pagein(&vf->os,og_ptr);
break;
- }
- }
+ }
+ }
}
if(vf->ready_state!=STREAMSET){
}
while(1){
-
+
i=0;
while(i<2){ /* get a page loop */
-
+
while(i<2){ /* get a packet loop */
-
+
int result=ogg_stream_packetout(&vf->os,&op);
if(result==0)break;
if(result==-1){
ret=OV_EBADHEADER;
goto bail_header;
}
-
+
if((ret=vorbis_synthesis_headerin(vi,vc,&op)))
goto bail_header;
-
+
i++;
}
-
+
while(i<2){
if(_get_next_page(vf,og_ptr,CHUNKSIZE)<0){
ret=OV_EBADHEADER;
goto bail_header;
}
-
+
/* if this page belongs to the correct stream, go parse it */
if(vf->os.serialno == ogg_page_serialno(og_ptr)){
ogg_stream_pagein(&vf->os,og_ptr);
break;
}
-
+
/* if we never see the final vorbis headers before the link
ends, abort */
if(ogg_page_bos(og_ptr)){
}else
allbos=1;
}
-
+
/* otherwise, keep looking */
}
}
-
- return 0;
+
+ return 0;
}
bail_header:
ogg_packet op;
if(_get_next_page(vf,&og,-1)<0)
break; /* should not be possible unless the file is truncated/mangled */
-
+
if(ogg_page_bos(&og)) break;
if(ogg_page_serialno(&og)!=serialno) continue;
-
+
/* count blocksizes of all frames in the page */
ogg_stream_pagein(&vf->os,&og);
while((result=ogg_stream_packetout(&vf->os,&op))){
if(result>0){ /* ignore holes */
- long thisblock=vorbis_packet_blocksize(vi,&op);
- if(lastblock!=-1)
- accumulated+=(lastblock+thisblock)>>2;
- lastblock=thisblock;
+ long thisblock=vorbis_packet_blocksize(vi,&op);
+ if(lastblock!=-1)
+ accumulated+=(lastblock+thisblock)>>2;
+ lastblock=thisblock;
}
}
/* less than zero? This is a stream with samples trimmed off
the beginning, a normal occurrence; set the offset to zero */
if(accumulated<0)accumulated=0;
-
+
return accumulated;
}
Recurses for each link so it can alloc the link storage after
finding them all, then unroll and fill the cache at the same time */
static int _bisect_forward_serialno(OggVorbis_File *vf,
- ogg_int64_t begin,
- ogg_int64_t searched,
- ogg_int64_t end,
- ogg_int64_t endgran,
- int endserial,
- long *currentno_list,
- int currentnos,
- long m){
+ ogg_int64_t begin,
+ ogg_int64_t searched,
+ ogg_int64_t end,
+ ogg_int64_t endgran,
+ int endserial,
+ long *currentno_list,
+ int currentnos,
+ long m){
ogg_int64_t pcmoffset;
ogg_int64_t dataoffset=searched;
ogg_int64_t endsearched=end;
ogg_int64_t ret,last;
int serialno = vf->os.serialno;
- /* invariants:
+ /* invariants:
we have the headers and serialnos for the link beginning at 'begin'
- we have the offset and granpos of the last page in the file (potentially
+ we have the offset and granpos of the last page in the file (potentially
not a page we care about)
*/
down to (or just started with) a single link. Now we need to
find the last vorbis page belonging to the first vorbis stream
for this link. */
-
+
while(endserial != serialno){
endserial = serialno;
- vf->offset=_get_prev_page_serial(vf,&endserial,&endgran);
+ vf->offset=_get_prev_page_serial(vf,currentno_list,currentnos,&endserial,&endgran);
}
vf->links=m+1;
vf->offsets[m+1]=end;
vf->offsets[m]=begin;
- vf->pcmlengths[m*2+1]=endgran;
+ vf->pcmlengths[m*2+1]=endgran;
}else{
-
+
long *next_serialno_list=NULL;
int next_serialnos=0;
vorbis_info vi;
first pages of two links. */
while(searched<endsearched){
ogg_int64_t bisect;
-
+
if(endsearched-searched<CHUNKSIZE){
- bisect=searched;
+ bisect=searched;
}else{
- bisect=(searched+endsearched)/2;
+ 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;
+ endsearched=bisect;
+ if(last>=0)next=last;
}else{
- searched=last+og.header_len+og.body_len;
+ searched=last+og.header_len+og.body_len;
}
}
int testserial = serialno+1;
vf->offset = next;
while(testserial != serialno){
- testserial = serialno;
- vf->offset=_get_prev_page_serial(vf,&testserial,&searchgran);
+ testserial = serialno;
+ vf->offset=_get_prev_page_serial(vf,currentno_list,currentnos,&testserial,&searchgran);
}
}
pcmoffset = _initial_pcmoffset(vf,&vi);
ret=_bisect_forward_serialno(vf,next,vf->offset,end,endgran,endserial,
- next_serialno_list,next_serialnos,m+1);
+ 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;
}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.f;
/* 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,&endserial,&endgran);
+ end=_get_prev_page_serial(vf,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,vf->offset,endgran,endserial,
- vf->serialnos+2,vf->serialnos[1],0)<0)return(OV_EREAD);
+ vf->serialnos+2,vf->serialnos[1],0)<0)return(OV_EREAD);
vf->offsets[0]=0;
vf->serialnos[0]=serialno;
return(ov_raw_seek(vf,dataoffset));
}
-/* clear out the current logical bitstream decoder */
+/* clear out the current logical bitstream decoder */
static void _decode_clear(OggVorbis_File *vf){
vorbis_dsp_clear(&vf->vd);
vorbis_block_clear(&vf->vb);
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).
+ readp).
return: <0) error, OV_HOLE (lost packet) or OV_EOF
0) need more data (only if readp==0)
- 1) got a packet
+ 1) got a packet
*/
static int _fetch_and_process_packet(OggVorbis_File *vf,
- ogg_packet *op_in,
- int readp,
- int spanp){
+ 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){
-
- /* process a packet if we can. If the machine isn't loaded,
- neither is a page */
+
+ if(vf->ready_state==STREAMSET){
+ int ret=_make_decode_ready(vf);
+ if(ret<0)return ret;
+ }
+
+ /* process a packet if we can. */
+
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,
+ 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)-oldsamples;
- 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(oldsamples)return(OV_EFAULT);
+
+ vorbis_synthesis_blockin(&vf->vd,&vf->vb);
+ vf->samptrack+=vorbis_synthesis_pcmout(&vf->vd,NULL)-oldsamples;
+ 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;
+
+ 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.
+ /* 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
we're now nominally at the header of the next bitstream
*/
- if(vf->ready_state!=INITSET){
+ if(vf->ready_state!=INITSET){
int link;
if(vf->ready_state<STREAMSET){
- if(vf->seekable){
- long 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;
- }
- }
-
- {
- int ret=_make_decode_ready(vf);
- if(ret<0)return ret;
+ if(vf->seekable){
+ long 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;
+ }
}
}
}
static int _ov_open1(void *f,OggVorbis_File *vf,char *initial,
- long ibytes, ov_callbacks callbacks){
+ long ibytes, ov_callbacks callbacks){
int offsettest=((f && callbacks.seek_func)?callbacks.seek_func(f,0,SEEK_CUR):-1);
long *serialno_list=NULL;
int serialno_list_size=0;
int ret;
-
+
memset(vf,0,sizeof(*vf));
vf->datasource=f;
vf->callbacks = callbacks;
vf->serialnos[0]=vf->current_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;
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);
+ vorbis_info_clear(vf->vi+i);
+ vorbis_comment_clear(vf->vc+i);
}
_ogg_free(vf->vi);
_ogg_free(vf->vc);
/* 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.
+ bitstream sections that are truncated/woogie.
return: -1) error
0) OK
return ret;
}
-
+
/* cheap hack for game usage where downsampling is desirable; there's
no need for SRC as we can just do it cheaply in libvorbis. */
-
+
int ov_halfrate(OggVorbis_File *vf,int flag){
int i;
if(vf->vi==NULL)return OV_EINVAL;
for now dumping the decode machine is needed
to reinit the MDCT lookups. 1.1 libvorbis
is planned to be able to switch on the fly */
-
+
for(i=0;i<vf->links;i++){
if(vorbis_synthesis_halfrate(vf->vi+i,flag)){
ov_halfrate(vf,0);
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);
}else{
/* return nominal if set */
if(vf->vi[i].bitrate_nominal>0){
- return vf->vi[i].bitrate_nominal;
+ 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);
+ 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
+ EINVAL if stream is only partially open
*/
long ov_bitrate_instant(OggVorbis_File *vf){
int link=(vf->seekable?vf->current_link:0);
/* 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
+ 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);
}
/* 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
+ (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);
/* returns: total seconds of content if i==-1
seconds 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
+ OV_EINVAL if the stream is not seekable (we can't know the
+ length) or only partially open
*/
double ov_time_total(OggVorbis_File *vf,int i){
if(vf->ready_state<OPENED)return(OV_EINVAL);
boundary */
vf->pcm_offset=-1;
ogg_stream_reset_serialno(&vf->os,
- vf->current_serialno); /* must set serialno */
+ vf->current_serialno); /* must set serialno */
vorbis_synthesis_restart(&vf->vd);
-
+
ret=_seek_helper(vf,pos);
if(ret)goto seek_error;
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.
+ 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.
+ correct.
*/
{
int lastblock=0;
int accblock=0;
int thisblock=0;
- int eosflag=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
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);
- }
+ /* 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
+ preceeding 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){
- if(_get_next_page(vf,&og,-1)<0){
- vf->pcm_offset=ov_pcm_total(vf,-1);
- break;
- }
+ 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;
+ /* 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->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;
- long 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;
-
+ int link;
+ long 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);
- eosflag=ogg_page_eos(&og);
+ lastflag=ogg_page_eos(&og);
+
}
}
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];
ogg_int64_t endtime = vf->pcmlengths[link*2+1]+begintime;
ogg_int64_t target=pos-total+begintime;
ogg_int64_t best=begin;
-
+
ogg_page og;
while(begin<end){
ogg_int64_t bisect;
-
+
if(end-begin<CHUNKSIZE){
- bisect=begin;
+ bisect=begin;
}else{
- /* take a (pretty decent) guess. */
- bisect=begin +
- (ogg_int64_t)((double)(target-begintime)*(end-begin)/(endtime-begintime))
- - CHUNKSIZE;
- if(bisect<=begin)
- bisect=begin+1;
+ /* take a (pretty decent) guess. */
+ bisect=begin +
+ (ogg_int64_t)((double)(target-begintime)*(end-begin)/(endtime-begintime))
+ - CHUNKSIZE;
+ if(bisect>begin+CHUNKSIZE){
+ result=_seek_helper(vf,bisect);
+ if(result) goto seek_error;
+ }else{
+ bisect=begin;
+ }
}
-
- result=_seek_helper(vf,bisect);
- if(result) goto seek_error;
-
+
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;
- result=_seek_helper(vf,bisect);
- if(result) goto seek_error;
- }
- }else{
- ogg_int64_t granulepos;
-
- if(ogg_page_serialno(&og)!=vf->serialnos[link])
- continue;
-
- 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;
- result=_seek_helper(vf,bisect);
- if(result) goto seek_error;
- }else{
- end=bisect;
- endtime=granulepos;
- break;
- }
- }
- }
- }
+ 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;
+ result=_seek_helper(vf,bisect);
+ if(result) goto seek_error;
+ }
+ }else{
+ ogg_int64_t granulepos;
+
+ if(ogg_page_serialno(&og)!=vf->serialnos[link])
+ continue;
+
+ 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;
+ result=_seek_helper(vf,bisect);
+ if(result) goto seek_error;
+ }else{
+ end=bisect;
+ endtime=granulepos;
+ break;
+ }
+ }
+ }
+ }
}
}
{
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;
-
+ /* 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);
+ vorbis_synthesis_restart(&vf->vd);
}
ogg_stream_reset_serialno(&vf->os,vf->current_serialno);
/* 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
+ 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. */
-
- result=_seek_helper(vf,best);
- if(result<0) goto seek_error;
-
- while(1){
- result=_get_prev_page(vf,&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);
- }
- 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);
+
+ result=_seek_helper(vf,best);
+ if(result<0) goto seek_error;
+
+ while(1){
+ result=_get_prev_page(vf,&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);
+ }
+ 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;
vf->bittrack=0.f;
vf->samptrack=0.f;
return(0);
-
+
seek_error:
/* dump machine so we're in a known state */
vf->pcm_offset=-1;
return (int)result;
}
-/* seek to a sample offset relative to the decompressed pcm stream
+/* 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){
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 */
+ 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;
-
+ 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);
-
+ vorbis_synthesis_blockin(&vf->vd,&vf->vb);
+
/* end of logical stream case is hard, especially with exact
- length positioning. */
-
+ 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];
+ 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){
- long 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;
+ long 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);
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 */
+ vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */
}
return 0;
}
-/* seek to a playback time relative to the decompressed pcm stream
+/* 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,double seconds){
/* translate time to PCM position and call ov_pcm_seek */
if(vf->ready_state<OPENED)return(OV_EINVAL);
if(!vf->seekable)return(OV_ENOSEEK);
if(seconds<0)return(OV_EINVAL);
-
+
/* which bitstream section does this time offset occur in? */
for(link=0;link<vf->links;link++){
double addsec = ov_time_total(vf,link);
}
}
-/* page-granularity version of ov_time_seek
+/* page-granularity version of ov_time_seek
returns zero on success, nonzero on failure */
int ov_time_seek_page(OggVorbis_File *vf,double seconds){
/* translate time to PCM position and call ov_pcm_seek */
if(vf->ready_state<OPENED)return(OV_EINVAL);
if(!vf->seekable)return(OV_ENOSEEK);
if(seconds<0)return(OV_EINVAL);
-
+
/* which bitstream section does this time offset occur in? */
for(link=0;link<vf->links;link++){
double addsec = ov_time_total(vf,link);
int link=0;
ogg_int64_t pcm_total=0;
double time_total=0.f;
-
+
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];
/* 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 */
if(vf->seekable){
if(link<0)
if(vf->ready_state>=STREAMSET)
- return vf->vi+vf->current_link;
+ return vf->vi+vf->current_link;
else
return vf->vi;
else
if(link>=vf->links)
- return NULL;
+ return NULL;
else
- return vf->vi+link;
+ return vf->vi+link;
}else{
return vf->vi;
}
if(vf->seekable){
if(link<0)
if(vf->ready_state>=STREAMSET)
- return vf->vc+vf->current_link;
+ return vf->vc+vf->current_link;
else
- return vf->vc;
+ return vf->vc;
else
if(link>=vf->links)
- return NULL;
+ return NULL;
else
- return vf->vc+link;
+ return vf->vc+link;
}else{
return vf->vc;
}
after the audio has been converted into integral PCM.
input values: buffer) a buffer to hold packed PCM data for return
- length) the byte length requested to be placed into buffer
- bigendianp) should the data be packed LSB first (0) or
- MSB first (1)
- word) word size for output. currently 1 (byte) or
- 2 (16 bit short)
+ length) the byte length requested to be placed into buffer
+ bigendianp) should the data be packed LSB first (0) or
+ MSB first (1)
+ word) word size for output. currently 1 (byte) or
+ 2 (16 bit short)
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.
+ 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 */
+ *section) set to the logical bitstream number */
long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
- int bigendianp,int word,int sgned,int *bitstream,
- void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param){
+ int bigendianp,int word,int sgned,int *bitstream,
+ void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param){
int i,j;
int host_endian = host_is_big_endian();
{
int ret=_fetch_and_process_packet(vf,NULL,1,1);
if(ret==OV_EOF)
- return(0);
+ return(0);
if(ret<=0)
- return(ret);
+ return(ret);
}
}
if(samples>0){
-
+
/* yay! proceed to pack data into the byte buffer */
-
+
long channels=ov_info(vf,-1)->channels;
long bytespersample=word * channels;
vorbis_fpu_control fpu;
if(samples <= 0)
return OV_EINVAL;
-
+
/* Here. */
if(filter)
filter(pcm,channels,samples,filter_param);
{
int val;
if(word==1){
- int off=(sgned?0:128);
- vorbis_fpu_setround(&fpu);
- for(j=0;j<samples;j++)
- for(i=0;i<channels;i++){
- val=vorbis_ftoi(pcm[i][j]*128.f);
- if(val>127)val=127;
- else if(val<-128)val=-128;
- *buffer++=val+off;
- }
- vorbis_fpu_restore(fpu);
+ int off=(sgned?0:128);
+ vorbis_fpu_setround(&fpu);
+ for(j=0;j<samples;j++)
+ for(i=0;i<channels;i++){
+ val=vorbis_ftoi(pcm[i][j]*128.f);
+ if(val>127)val=127;
+ else if(val<-128)val=-128;
+ *buffer++=val+off;
+ }
+ vorbis_fpu_restore(fpu);
}else{
- int off=(sgned?0:32768);
-
- if(host_endian==bigendianp){
- if(sgned){
-
- vorbis_fpu_setround(&fpu);
- for(i=0;i<channels;i++) { /* It's faster in this order */
- float *src=pcm[i];
- short *dest=((short *)buffer)+i;
- for(j=0;j<samples;j++) {
- val=vorbis_ftoi(src[j]*32768.f);
- if(val>32767)val=32767;
- else if(val<-32768)val=-32768;
- *dest=val;
- dest+=channels;
- }
- }
- vorbis_fpu_restore(fpu);
-
- }else{
-
- vorbis_fpu_setround(&fpu);
- for(i=0;i<channels;i++) {
- float *src=pcm[i];
- short *dest=((short *)buffer)+i;
- for(j=0;j<samples;j++) {
- val=vorbis_ftoi(src[j]*32768.f);
- if(val>32767)val=32767;
- else if(val<-32768)val=-32768;
- *dest=val+off;
- dest+=channels;
- }
- }
- vorbis_fpu_restore(fpu);
-
- }
- }else if(bigendianp){
-
- vorbis_fpu_setround(&fpu);
- for(j=0;j<samples;j++)
- for(i=0;i<channels;i++){
- val=vorbis_ftoi(pcm[i][j]*32768.f);
- if(val>32767)val=32767;
- else if(val<-32768)val=-32768;
- val+=off;
- *buffer++=(val>>8);
- *buffer++=(val&0xff);
- }
- vorbis_fpu_restore(fpu);
-
- }else{
- int val;
- vorbis_fpu_setround(&fpu);
- for(j=0;j<samples;j++)
- for(i=0;i<channels;i++){
- val=vorbis_ftoi(pcm[i][j]*32768.f);
- if(val>32767)val=32767;
- else if(val<-32768)val=-32768;
- val+=off;
- *buffer++=(val&0xff);
- *buffer++=(val>>8);
- }
- vorbis_fpu_restore(fpu);
-
- }
+ int off=(sgned?0:32768);
+
+ if(host_endian==bigendianp){
+ if(sgned){
+
+ vorbis_fpu_setround(&fpu);
+ for(i=0;i<channels;i++) { /* It's faster in this order */
+ float *src=pcm[i];
+ short *dest=((short *)buffer)+i;
+ for(j=0;j<samples;j++) {
+ val=vorbis_ftoi(src[j]*32768.f);
+ if(val>32767)val=32767;
+ else if(val<-32768)val=-32768;
+ *dest=val;
+ dest+=channels;
+ }
+ }
+ vorbis_fpu_restore(fpu);
+
+ }else{
+
+ vorbis_fpu_setround(&fpu);
+ for(i=0;i<channels;i++) {
+ float *src=pcm[i];
+ short *dest=((short *)buffer)+i;
+ for(j=0;j<samples;j++) {
+ val=vorbis_ftoi(src[j]*32768.f);
+ if(val>32767)val=32767;
+ else if(val<-32768)val=-32768;
+ *dest=val+off;
+ dest+=channels;
+ }
+ }
+ vorbis_fpu_restore(fpu);
+
+ }
+ }else if(bigendianp){
+
+ vorbis_fpu_setround(&fpu);
+ for(j=0;j<samples;j++)
+ for(i=0;i<channels;i++){
+ val=vorbis_ftoi(pcm[i][j]*32768.f);
+ if(val>32767)val=32767;
+ else if(val<-32768)val=-32768;
+ val+=off;
+ *buffer++=(val>>8);
+ *buffer++=(val&0xff);
+ }
+ vorbis_fpu_restore(fpu);
+
+ }else{
+ int val;
+ vorbis_fpu_setround(&fpu);
+ for(j=0;j<samples;j++)
+ for(i=0;i<channels;i++){
+ val=vorbis_ftoi(pcm[i][j]*32768.f);
+ if(val>32767)val=32767;
+ else if(val<-32768)val=-32768;
+ val+=off;
+ *buffer++=(val&0xff);
+ *buffer++=(val>>8);
+ }
+ vorbis_fpu_restore(fpu);
+
+ }
}
}
-
+
vorbis_synthesis_read(&vf->vd,samples);
vf->pcm_offset+=samples;
if(bitstream)*bitstream=vf->current_link;
}
long ov_read(OggVorbis_File *vf,char *buffer,int length,
- int bigendianp,int word,int sgned,int *bitstream){
+ int bigendianp,int word,int sgned,int *bitstream){
return ov_read_filter(vf, buffer, length, bigendianp, word, sgned, bitstream, NULL, NULL);
}
/* input values: pcm_channels) a float vector per channel of output
- length) the sample length being read by the app
+ length) the sample length being read by the app
return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL)
0) EOF
- n) number of samples 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.
+ n) number of samples 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 */
+ *section) set to the logical bitstream number */
long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int length,
- int *bitstream){
+ int *bitstream){
if(vf->ready_state<OPENED)return(OV_EINVAL);
float **pcm;
long samples=vorbis_synthesis_pcmout(&vf->vd,&pcm);
if(samples){
- if(pcm_channels)*pcm_channels=pcm;
- if(samples>length)samples=length;
- vorbis_synthesis_read(&vf->vd,samples);
- vf->pcm_offset+=samples;
- if(bitstream)*bitstream=vf->current_link;
- return samples;
+ if(pcm_channels)*pcm_channels=pcm;
+ if(samples>length)samples=length;
+ vorbis_synthesis_read(&vf->vd,samples);
+ vf->pcm_offset+=samples;
+ if(bitstream)*bitstream=vf->current_link;
+ return samples;
}
}
}
extern float *vorbis_window(vorbis_dsp_state *v,int W);
-extern void _analysis_output_always(char *base,int i,float *v,int n,int bark,int dB,
- ogg_int64_t off);
static void _ov_splice(float **pcm,float **lappcm,
- int n1, int n2,
- int ch1, int ch2,
- float *w1, float *w2){
+ int n1, int n2,
+ int ch1, int ch2,
+ float *w1, float *w2){
int i,j;
float *w=w1;
int n=n1;
}
}
-
+
/* make sure vf is INITSET */
static int _ov_initset(OggVorbis_File *vf){
while(1){
while(1){
if(vf->ready_state==INITSET)
if(vorbis_synthesis_pcmout(vd,NULL))break;
-
+
/* suck in another packet */
{
int ret=_fetch_and_process_packet(vf,NULL,1,0);
if(ret<0 && ret!=OV_HOLE)return(ret);
}
- }
+ }
return 0;
}
unreturned, already-decoded pcm, remaining PCM we will need to
decode, or synthetic postextrapolation from last packets. */
static void _ov_getlap(OggVorbis_File *vf,vorbis_info *vi,vorbis_dsp_state *vd,
- float **lappcm,int lapsize){
+ float **lappcm,int lapsize){
int lapcount=0,i;
float **pcm;
if(samples){
if(samples>lapsize-lapcount)samples=lapsize-lapcount;
for(i=0;i<vi->channels;i++)
- memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples);
+ memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples);
lapcount+=samples;
vorbis_synthesis_read(vd,samples);
}else{
int samples=vorbis_synthesis_lapout(&vf->vd,&pcm);
if(samples==0){
for(i=0;i<vi->channels;i++)
- memset(lappcm[i]+lapcount,0,sizeof(**pcm)*lapsize-lapcount);
+ memset(lappcm[i]+lapcount,0,sizeof(**pcm)*lapsize-lapcount);
lapcount=lapsize;
}else{
if(samples>lapsize-lapcount)samples=lapsize-lapcount;
for(i=0;i<vi->channels;i++)
- memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples);
+ memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples);
lapcount+=samples;
}
}
buffer of vf2 */
/* consolidate and expose the buffer. */
vorbis_synthesis_lapout(&vf2->vd,&pcm);
+
+#if 0
_analysis_output_always("pcmL",0,pcm[0],n1*2,0,0,0);
_analysis_output_always("pcmR",0,pcm[1],n1*2,0,0,0);
+#endif
/* splice */
_ov_splice(pcm,lappcm,n1,n2,vi1->channels,vi2->channels,w1,w2);
-
+
/* done */
return(0);
}
static int _ov_64_seek_lap(OggVorbis_File *vf,ogg_int64_t pos,
- int (*localseek)(OggVorbis_File *,ogg_int64_t)){
+ int (*localseek)(OggVorbis_File *,ogg_int64_t)){
vorbis_info *vi;
float **lappcm;
float **pcm;
if(ret)return(ret);
vi=ov_info(vf,-1);
hs=ov_halfrate_p(vf);
-
+
ch1=vi->channels;
n1=vorbis_info_blocksize(vi,0)>>(1+hs);
w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are
- persistent; even if the decode state
- from this link gets dumped, this
- window array continues to exist */
+ persistent; even if the decode state
+ from this link gets dumped, this
+ window array continues to exist */
lappcm=alloca(sizeof(*lappcm)*ch1);
for(i=0;i<ch1;i++)
}
static int _ov_d_seek_lap(OggVorbis_File *vf,double pos,
- int (*localseek)(OggVorbis_File *,double)){
+ int (*localseek)(OggVorbis_File *,double)){
vorbis_info *vi;
float **lappcm;
float **pcm;
ch1=vi->channels;
n1=vorbis_info_blocksize(vi,0)>>(1+hs);
w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are
- persistent; even if the decode state
- from this link gets dumped, this
- window array continues to exist */
+ persistent; even if the decode state
+ from this link gets dumped, this
+ window array continues to exist */
lappcm=alloca(sizeof(*lappcm)*ch1);
for(i=0;i<ch1;i++)
projects / platform / upstream / libvorbis.git / blobdiff