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-rw-r--r--vorbis/lib/vorbisfile.c2424
1 files changed, 0 insertions, 2424 deletions
diff --git a/vorbis/lib/vorbisfile.c b/vorbis/lib/vorbisfile.c
deleted file mode 100644
index b570c3c..0000000
--- a/vorbis/lib/vorbisfile.c
+++ /dev/null
@@ -1,2424 +0,0 @@
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * 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 1994-2015 *
- * by the Xiph.Org Foundation http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: stdio-based convenience library for opening/seeking/decoding
-
- ********************************************************************/
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#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"
-#include "misc.h"
-
-/* A 'chained bitstream' is a Vorbis bitstream that contains more than
- one logical bitstream arranged end to end (the only form of Ogg
- multiplexing allowed in a Vorbis bitstream; grouping [parallel
- multiplexing] is not allowed in Vorbis) */
-
-/* A Vorbis file can be played beginning to end (streamed) without
- worrying ahead of time about chaining (see decoder_example.c). If
- we have the whole file, however, and want random access
- (seeking/scrubbing) or desire to know the total length/time of a
- file, we need to account for the possibility of chaining. */
-
-/* We can handle things a number of ways; we can determine the entire
- bitstream structure right off the bat, or find pieces on demand.
- This example determines and caches structure for the entire
- bitstream, but builds a virtual decoder on the fly when moving
- between links in the chain. */
-
-/* There are also different ways to implement seeking. Enough
- information exists in an Ogg bitstream to seek to
- sample-granularity positions in the output. Or, one can seek by
- picking some portion of the stream roughly in the desired area if
- 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
- * 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 /* 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,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);
- }else
- return(0);
-}
-
-/* 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){
- /* only seek if the file position isn't already there */
- if(vf->offset != offset){
- if(!(vf->callbacks.seek_func)||
- (vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET) == -1)
- return OV_EREAD;
- vf->offset=offset;
- ogg_sync_reset(&vf->oy);
- }
- }else{
- /* shouldn't happen unless someone writes a broken callback */
- return OV_EFAULT;
- }
- return 0;
-}
-
-/* The read/seek functions track absolute position within the stream */
-
-/* from the head of the stream, get the next page. boundary specifies
- if the function is allowed to fetch more data from the stream (and
- how much) or only use internally buffered data.
-
- boundary: -1) unbounded search
- 0) read no additional data; use cached only
- 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){
- 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);
- }
- }else{
- /* 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);
-
- }
- }
- }
-}
-
-/* find the latest page beginning before the passed in position. Much
- dirtier than the above as Ogg doesn't have any backward search
- linkage. no 'readp' as it will certainly have to read. */
-/* returns offset or OV_EREAD, OV_FAULT */
-static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_int64_t begin,ogg_page *og){
- ogg_int64_t end = begin;
- ogg_int64_t ret;
- ogg_int64_t offset=-1;
-
- while(offset==-1){
- begin-=CHUNKSIZE;
- if(begin<0)
- begin=0;
-
- ret=_seek_helper(vf,begin);
- if(ret)return(ret);
-
- while(vf->offset<end){
- memset(og,0,sizeof(*og));
- ret=_get_next_page(vf,og,end-vf->offset);
- if(ret==OV_EREAD)return(OV_EREAD);
- if(ret<0){
- break;
- }else{
- offset=ret;
- }
- }
- }
-
- /* In a fully compliant, non-multiplexed stream, we'll still be
- holding the last page. In multiplexed (or noncompliant streams),
- we will probably have to re-read the last page we saw */
- if(og->header_len==0){
- ret=_seek_helper(vf,offset);
- if(ret)return(ret);
-
- ret=_get_next_page(vf,og,CHUNKSIZE);
- if(ret<0)
- /* this shouldn't be possible */
- return(OV_EFAULT);
- }
-
- 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, ogg_int64_t begin,
- long *serial_list, int serial_n,
- int *serialno, ogg_int64_t *granpos){
- ogg_page og;
- ogg_int64_t end=begin;
- ogg_int64_t ret;
-
- ogg_int64_t prefoffset=-1;
- ogg_int64_t offset=-1;
- ogg_int64_t ret_serialno=-1;
- ogg_int64_t ret_gran=-1;
-
- while(offset==-1){
- begin-=CHUNKSIZE;
- if(begin<0)
- begin=0;
-
- ret=_seek_helper(vf,begin);
- if(ret)return(ret);
-
- while(vf->offset<end){
- ret=_get_next_page(vf,&og,end-vf->offset);
- if(ret==OV_EREAD)return(OV_EREAD);
- if(ret<0){
- 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;
- }
-
- 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;
- }
- }
- }
- }
-
- /* we're not interested in the page... just the serialno and granpos. */
- if(prefoffset>=0)return(prefoffset);
-
- *serialno = ret_serialno;
- *granpos = ret_gran;
- return(offset);
-
-}
-
-/* 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,
- ogg_page *og_ptr){
- ogg_page og;
- ogg_packet op;
- int i,ret;
- int allbos=0;
-
- if(!og_ptr){
- ogg_int64_t llret=_get_next_page(vf,&og,CHUNKSIZE);
- if(llret==OV_EREAD)return(OV_EREAD);
- if(llret<0)return(OV_ENOTVORBIS);
- og_ptr=&og;
- }
-
- vorbis_info_init(vi);
- vorbis_comment_init(vc);
- vf->ready_state=OPENED;
-
- /* extract the serialnos of all BOS pages + the first set of vorbis
- headers we see in the link */
-
- while(ogg_page_bos(og_ptr)){
- if(serialno_list){
- if(_lookup_page_serialno(og_ptr,*serialno_list,*serialno_n)){
- /* a dupe serialnumber in an initial header packet set == invalid stream */
- if(*serialno_list)_ogg_free(*serialno_list);
- *serialno_list=0;
- *serialno_n=0;
- ret=OV_EBADHEADER;
- goto bail_header;
- }
-
- _add_serialno(og_ptr,serialno_list,serialno_n);
- }
-
- if(vf->ready_state<STREAMSET){
- /* we don't have a vorbis stream in this link yet, so begin
- prospective stream setup. We need a stream to get packets */
- ogg_stream_reset_serialno(&vf->os,ogg_page_serialno(og_ptr));
- ogg_stream_pagein(&vf->os,og_ptr);
-
- if(ogg_stream_packetout(&vf->os,&op) > 0 &&
- vorbis_synthesis_idheader(&op)){
- /* vorbis header; continue setup */
- vf->ready_state=STREAMSET;
- if((ret=vorbis_synthesis_headerin(vi,vc,&op))){
- ret=OV_EBADHEADER;
- goto bail_header;
- }
- }
- }
-
- /* get next page */
- {
- ogg_int64_t llret=_get_next_page(vf,og_ptr,CHUNKSIZE);
- if(llret==OV_EREAD){
- ret=OV_EREAD;
- goto bail_header;
- }
- if(llret<0){
- ret=OV_ENOTVORBIS;
- goto bail_header;
- }
-
- /* if this page also belongs to our vorbis stream, submit it and break */
- 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){
- ret = OV_ENOTVORBIS;
- goto bail_header;
- }
-
- 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)){
- if(allbos){
- ret = OV_EBADHEADER;
- goto bail_header;
- }else
- allbos=1;
- }
-
- /* otherwise, keep looking */
- }
- }
-
- return 0;
- }
-
- bail_header:
- vorbis_info_clear(vi);
- vorbis_comment_clear(vc);
- vf->ready_state=OPENED;
-
- return ret;
-}
-
-/* Starting from current cursor position, get initial PCM offset of
- next page. Consumes the page in the process without decoding
- audio, however this is only called during stream parsing upon
- seekable open. */
-static ogg_int64_t _initial_pcmoffset(OggVorbis_File *vf, vorbis_info *vi){
- ogg_page og;
- ogg_int64_t accumulated=0;
- long lastblock=-1;
- int result;
- int serialno = vf->os.serialno;
-
- while(1){
- 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(thisblock>=0){
- if(lastblock!=-1)
- accumulated+=(lastblock+thisblock)>>2;
- lastblock=thisblock;
- }
- }
- }
-
- if(ogg_page_granulepos(&og)!=-1){
- /* pcm offset of last packet on the first audio page */
- accumulated= ogg_page_granulepos(&og)-accumulated;
- break;
- }
- }
-
- /* less than zero? Either a corrupt file or a stream with samples
- trimmed off the beginning, a normal occurrence; in both cases set
- the offset to zero */
- if(accumulated<0)accumulated=0;
-
- return accumulated;
-}
-
-/* finds each bitstream link one at a time using a bisection search
- (has to begin by knowing the offset of the lb's initial page).
- 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 pcmoffset;
- ogg_int64_t dataoffset=searched;
- ogg_int64_t endsearched=end;
- ogg_int64_t next=end;
- ogg_int64_t searchgran=-1;
- ogg_page og;
- ogg_int64_t ret,last;
- int serialno = vf->os.serialno;
-
- /* 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
- not a page we care about)
- */
-
- /* Is the last page in our list of current serialnumbers? */
- if(_lookup_serialno(endserial,currentno_list,currentnos)){
-
- /* last page is in the starting serialno list, so we've bisected
- 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. */
- searched = end;
- while(endserial != serialno){
- endserial = serialno;
- searched=_get_prev_page_serial(vf,searched,currentno_list,currentnos,&endserial,&endgran);
- }
-
- vf->links=m+1;
- if(vf->offsets)_ogg_free(vf->offsets);
- if(vf->serialnos)_ogg_free(vf->serialnos);
- if(vf->dataoffsets)_ogg_free(vf->dataoffsets);
-
- 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. */
-
- long *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.f;
- vf->samptrack=0.f;
- 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(vf->ready_state==INITSET){
- int hs=vorbis_synthesis_halfrate_p(vf->vi);
-
- 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)<<hs);
- 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)<<hs);
-
- 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){
- 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;
- }
- }
- }
-
- /* 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);
- long *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;
-}
-
-
-/* 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;
- if(vf->ready_state>STREAMSET){
- /* clear out stream state; dumping the decode machine is needed to
- reinit the MDCT lookups. */
- vorbis_dsp_clear(&vf->vd);
- vorbis_block_clear(&vf->vb);
- vf->ready_state=STREAMSET;
- if(vf->pcm_offset>=0){
- ogg_int64_t pos=vf->pcm_offset;
- vf->pcm_offset=-1; /* make sure the pos is dumped if unseekable */
- ov_pcm_seek(vf,pos);
- }
- }
-
- for(i=0;i<vf->links;i++){
- if(vorbis_synthesis_halfrate(vf->vi+i,flag)){
- if(flag) ov_halfrate(vf,0);
- return OV_EINVAL;
- }
- }
- return 0;
-}
-
-int ov_halfrate_p(OggVorbis_File *vf){
- if(vf->vi==NULL)return OV_EINVAL;
- return vorbis_synthesis_halfrate_p(vf->vi);
-}
-
-/* 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.
-
- Note that vorbisfile does _not_ take ownership of the file if the
- call fails; the calling applicaiton is responsible for closing the file
- if this call returns an error. */
-
-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;
- float br;
- 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.
- */
- br = bits/ov_time_total(vf,-1);
- return(rint(br));
- }else{
- if(vf->seekable){
- /* return the actual bitrate */
- return(rint((vf->offsets[i+1]-vf->dataoffsets[i])*8/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+.5;
- vf->bittrack=0.f;
- vf->samptrack=0.f;
- 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 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
-*/
-double 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){
- double acc=0;
- int i;
- for(i=0;i<vf->links;i++)
- acc+=ov_time_total(vf,i);
- return(acc);
- }else{
- return((double)(vf->pcmlengths[i*2+1])/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;
- 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);
- lastflag=ogg_page_eos(&og);
-
- }
- }
-
- ogg_stream_clear(&work_os);
- vf->bittrack=0.f;
- vf->samptrack=0.f;
- 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;
-}
-
-/* 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 +
- (ogg_int64_t)((double)(target-begintime)*(end-begin)/(endtime-begintime))
- - 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 cntinue 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.f;
- vf->samptrack=0.f;
- 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){
- 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);
- }
- }
-
- vf->bittrack=0.f;
- vf->samptrack=0.f;
- /* discard samples until we reach the desired position. Crossing a
- logical bitstream boundary with abandon is OK. */
- {
- /* note that halfrate could be set differently in each link, but
- vorbisfile encoforces all links are set or unset */
- int hs=vorbis_synthesis_halfrate_p(vf->vi);
- while(vf->pcm_offset<((pos>>hs)<<hs)){
- ogg_int64_t target=(pos-vf->pcm_offset)>>hs;
- long samples=vorbis_synthesis_pcmout(&vf->vd,NULL);
-
- if(samples>target)samples=target;
- vorbis_synthesis_read(&vf->vd,samples);
- vf->pcm_offset+=samples<<hs;
-
- 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,double seconds){
- /* translate time to PCM position and call ov_pcm_seek */
-
- int link=-1;
- ogg_int64_t pcm_total=0;
- double time_total=0.;
-
- 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);
- if(seconds<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+(seconds-time_total)*vf->vi[link].rate;
- 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,double seconds){
- /* translate time to PCM position and call ov_pcm_seek */
-
- int link=-1;
- ogg_int64_t pcm_total=0;
- double time_total=0.;
-
- 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);
- if(seconds<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+(seconds-time_total)*vf->vi[link].rate;
- 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 (seconds) of next PCM sample to be read */
-double ov_time_tell(OggVorbis_File *vf){
- 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];
- time_total-=ov_time_total(vf,link);
- if(vf->pcm_offset>=pcm_total)break;
- }
- }
-
- return((double)time_total+(double)(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;
- }
-}
-
-static int host_is_big_endian() {
- ogg_int32_t pattern = 0xfeedface; /* deadbeef */
- unsigned char *bytewise = (unsigned char *)&pattern;
- if (bytewise[0] == 0xfe) return 1;
- return 0;
-}
-
-/* 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).
-
- ov_read_filter is exactly the same as ov_read except that it processes
- the decoded audio data through a filter before packing it into the
- requested format. This gives greater accuracy than applying a filter
- 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)
-
- 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_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 i,j;
- int host_endian = host_is_big_endian();
- int hs;
-
- float **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;
- long bytespersample=word * channels;
- vorbis_fpu_control fpu;
- if(samples>length/bytespersample)samples=length/bytespersample;
-
- if(samples <= 0)
- return OV_EINVAL;
-
- /* Here. */
- if(filter)
- filter(pcm,channels,samples,filter_param);
-
- /* a tight loop to pack each size */
- {
- 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);
- }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);
-
- }
- }
- }
-
- vorbis_synthesis_read(&vf->vd,samples);
- hs=vorbis_synthesis_halfrate_p(vf->vi);
- vf->pcm_offset+=(samples<<hs);
- if(bitstream)*bitstream=vf->current_link;
- return(samples*bytespersample);
- }else{
- return(samples);
- }
-}
-
-long ov_read(OggVorbis_File *vf,char *buffer,int length,
- 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
-
- 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.
-
- *section) set to the logical bitstream number */
-
-
-
-long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int length,
- int *bitstream){
-
- if(vf->ready_state<OPENED)return(OV_EINVAL);
-
- while(1){
- if(vf->ready_state==INITSET){
- float **pcm;
- long samples=vorbis_synthesis_pcmout(&vf->vd,&pcm);
- if(samples){
- int hs=vorbis_synthesis_halfrate_p(vf->vi);
- if(pcm_channels)*pcm_channels=pcm;
- if(samples>length)samples=length;
- vorbis_synthesis_read(&vf->vd,samples);
- vf->pcm_offset+=samples<<hs;
- if(bitstream)*bitstream=vf->current_link;
- return samples;
-
- }
- }
-
- /* 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);
- }
-
- }
-}
-
-extern const float *vorbis_window(vorbis_dsp_state *v,int W);
-
-static void _ov_splice(float **pcm,float **lappcm,
- int n1, int n2,
- int ch1, int ch2,
- const float *w1, const float *w2){
- int i,j;
- const float *w=w1;
- int n=n1;
-
- if(n1>n2){
- n=n2;
- w=w2;
- }
-
- /* splice */
- for(j=0;j<ch1 && j<ch2;j++){
- float *s=lappcm[j];
- float *d=pcm[j];
-
- for(i=0;i<n;i++){
- float wd=w[i]*w[i];
- float ws=1.-wd;
- d[i]=d[i]*wd + s[i]*ws;
- }
- }
- /* window from zero */
- for(;j<ch2;j++){
- float *d=pcm[j];
- for(i=0;i<n;i++){
- float wd=w[i]*w[i];
- d[i]=d[i]*wd;
- }
- }
-
-}
-
-/* make sure vf is INITSET */
-static int _ov_initset(OggVorbis_File *vf){
- while(1){
- if(vf->ready_state==INITSET)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;
-}
-
-/* make sure vf is INITSET and that we have a primed buffer; if
- we're crosslapping at a stream section boundary, this also makes
- sure we're sanity checking against the right stream information */
-static int _ov_initprime(OggVorbis_File *vf){
- vorbis_dsp_state *vd=&vf->vd;
- 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;
-}
-
-/* grab enough data for lapping from vf; this may be in the form of
- 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){
- int lapcount=0,i;
- float **pcm;
-
- /* try first to decode the lapping data */
- while(lapcount<lapsize){
- int samples=vorbis_synthesis_pcmout(vd,&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);
- lapcount+=samples;
- vorbis_synthesis_read(vd,samples);
- }else{
- /* suck in another packet */
- int ret=_fetch_and_process_packet(vf,NULL,1,0); /* do *not* span */
- if(ret==OV_EOF)break;
- }
- }
- if(lapcount<lapsize){
- /* failed to get lapping data from normal decode; pry it from the
- postextrapolation buffering, or the second half of the MDCT
- from the last packet */
- 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);
- 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);
- lapcount+=samples;
- }
- }
-}
-
-/* this sets up crosslapping of a sample by using trailing data from
- sample 1 and lapping it into the windowing buffer of sample 2 */
-int ov_crosslap(OggVorbis_File *vf1, OggVorbis_File *vf2){
- vorbis_info *vi1,*vi2;
- float **lappcm;
- float **pcm;
- const float *w1,*w2;
- int n1,n2,i,ret,hs1,hs2;
-
- if(vf1==vf2)return(0); /* degenerate case */
- if(vf1->ready_state<OPENED)return(OV_EINVAL);
- if(vf2->ready_state<OPENED)return(OV_EINVAL);
-
- /* the relevant overlap buffers must be pre-checked and pre-primed
- before looking at settings in the event that priming would cross
- a bitstream boundary. So, do it now */
-
- ret=_ov_initset(vf1);
- if(ret)return(ret);
- ret=_ov_initprime(vf2);
- if(ret)return(ret);
-
- vi1=ov_info(vf1,-1);
- vi2=ov_info(vf2,-1);
- hs1=ov_halfrate_p(vf1);
- hs2=ov_halfrate_p(vf2);
-
- lappcm=alloca(sizeof(*lappcm)*vi1->channels);
- n1=vorbis_info_blocksize(vi1,0)>>(1+hs1);
- n2=vorbis_info_blocksize(vi2,0)>>(1+hs2);
- w1=vorbis_window(&vf1->vd,0);
- w2=vorbis_window(&vf2->vd,0);
-
- for(i=0;i<vi1->channels;i++)
- lappcm[i]=alloca(sizeof(**lappcm)*n1);
-
- _ov_getlap(vf1,vi1,&vf1->vd,lappcm,n1);
-
- /* have a lapping buffer from vf1; now to splice it into the lapping
- 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)){
- vorbis_info *vi;
- float **lappcm;
- float **pcm;
- const float *w1,*w2;
- int n1,n2,ch1,ch2,hs;
- int i,ret;
-
- if(vf->ready_state<OPENED)return(OV_EINVAL);
- ret=_ov_initset(vf);
- 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 */
-
- lappcm=alloca(sizeof(*lappcm)*ch1);
- for(i=0;i<ch1;i++)
- lappcm[i]=alloca(sizeof(**lappcm)*n1);
- _ov_getlap(vf,vi,&vf->vd,lappcm,n1);
-
- /* have lapping data; seek and prime the buffer */
- ret=localseek(vf,pos);
- if(ret)return ret;
- ret=_ov_initprime(vf);
- if(ret)return(ret);
-
- /* Guard against cross-link changes; they're perfectly legal */
- vi=ov_info(vf,-1);
- ch2=vi->channels;
- n2=vorbis_info_blocksize(vi,0)>>(1+hs);
- w2=vorbis_window(&vf->vd,0);
-
- /* consolidate and expose the buffer. */
- vorbis_synthesis_lapout(&vf->vd,&pcm);
-
- /* splice */
- _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2);
-
- /* done */
- return(0);
-}
-
-int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){
- return _ov_64_seek_lap(vf,pos,ov_raw_seek);
-}
-
-int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){
- return _ov_64_seek_lap(vf,pos,ov_pcm_seek);
-}
-
-int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos){
- return _ov_64_seek_lap(vf,pos,ov_pcm_seek_page);
-}
-
-static int _ov_d_seek_lap(OggVorbis_File *vf,double pos,
- int (*localseek)(OggVorbis_File *,double)){
- vorbis_info *vi;
- float **lappcm;
- float **pcm;
- const float *w1,*w2;
- int n1,n2,ch1,ch2,hs;
- int i,ret;
-
- if(vf->ready_state<OPENED)return(OV_EINVAL);
- ret=_ov_initset(vf);
- 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 */
-
- lappcm=alloca(sizeof(*lappcm)*ch1);
- for(i=0;i<ch1;i++)
- lappcm[i]=alloca(sizeof(**lappcm)*n1);
- _ov_getlap(vf,vi,&vf->vd,lappcm,n1);
-
- /* have lapping data; seek and prime the buffer */
- ret=localseek(vf,pos);
- if(ret)return ret;
- ret=_ov_initprime(vf);
- if(ret)return(ret);
-
- /* Guard against cross-link changes; they're perfectly legal */
- vi=ov_info(vf,-1);
- ch2=vi->channels;
- n2=vorbis_info_blocksize(vi,0)>>(1+hs);
- w2=vorbis_window(&vf->vd,0);
-
- /* consolidate and expose the buffer. */
- vorbis_synthesis_lapout(&vf->vd,&pcm);
-
- /* splice */
- _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2);
-
- /* done */
- return(0);
-}
-
-int ov_time_seek_lap(OggVorbis_File *vf,double pos){
- return _ov_d_seek_lap(vf,pos,ov_time_seek);
-}
-
-int ov_time_seek_page_lap(OggVorbis_File *vf,double pos){
- return _ov_d_seek_lap(vf,pos,ov_time_seek_page);
-}