diff options
Diffstat (limited to 'Tremolo/vorbisfile.c')
| -rw-r--r-- | Tremolo/vorbisfile.c | 1592 |
1 files changed, 1592 insertions, 0 deletions
diff --git a/Tremolo/vorbisfile.c b/Tremolo/vorbisfile.c new file mode 100644 index 0000000..7b6ce47 --- /dev/null +++ b/Tremolo/vorbisfile.c @@ -0,0 +1,1592 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 * + * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * + * * + ******************************************************************** + + function: stdio-based convenience library for opening/seeking/decoding + last mod: $Id: vorbisfile.c,v 1.6.2.5 2003/11/20 06:16:17 xiphmont Exp $ + + ********************************************************************/ + +#include <stdlib.h> +#include <stdio.h> +//#include <errno.h> +#include <string.h> +#include <math.h> + +#include "codec_internal.h" +#include "ivorbisfile.h" + +#include "os.h" +#include "misc.h" + +int errno; + +#define NOTOPEN 0 +#define PARTOPEN 1 +#define OPENED 2 +#define STREAMSET 3 /* serialno and link set, but not to current link */ +#define LINKSET 4 /* serialno and link set to current link */ +#define INITSET 5 + +/* 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 */ +static long _get_data(OggVorbis_File *vf){ + errno=0; + if(vf->datasource){ + unsigned char *buffer=ogg_sync_bufferin(vf->oy,CHUNKSIZE); + long bytes=(vf->callbacks.read_func)(buffer,1,CHUNKSIZE,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 void _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){ + if(vf->datasource){ + (vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET); + vf->offset=offset; + ogg_sync_reset(vf->oy); + }else{ + /* shouldn't happen unless someone writes a broken callback */ + return; + } +} + +/* 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 + + produces a refcounted page */ + +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 current stream cursor + 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 and produces a refcounted page */ + +static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_page *og){ + ogg_int64_t begin=vf->offset; + ogg_int64_t end=begin; + ogg_int64_t ret; + ogg_int64_t offset=-1; + + while(offset==-1){ + begin-=CHUNKSIZE; + if(begin<0) + begin=0; + _seek_helper(vf,begin); + 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{ + offset=ret; + } + } + } + + /* we have the offset. Actually snork and hold the page now */ + _seek_helper(vf,offset); + ret=_get_next_page(vf,og,CHUNKSIZE); + if(ret<0) + /* this shouldn't be possible */ + return OV_EFAULT; + + return offset; +} + +/* 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_uint32_t currentno, + long m){ + ogg_int64_t endsearched=end; + ogg_int64_t next=end; + ogg_page og={0,0,0,0}; + ogg_int64_t ret; + + /* 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; + } + + _seek_helper(vf,bisect); + ret=_get_next_page(vf,&og,-1); + if(ret==OV_EREAD)return OV_EREAD; + if(ret<0 || ogg_page_serialno(&og)!=currentno){ + endsearched=bisect; + if(ret>=0)next=ret; + }else{ + searched=ret+og.header_len+og.body_len; + } + ogg_page_release(&og); + } + + _seek_helper(vf,next); + ret=_get_next_page(vf,&og,-1); + if(ret==OV_EREAD)return OV_EREAD; + + if(searched>=end || ret<0){ + ogg_page_release(&og); + vf->links=m+1; + vf->offsets=_ogg_malloc((vf->links+1)*sizeof(*vf->offsets)); + vf->serialnos=_ogg_malloc(vf->links*sizeof(*vf->serialnos)); + vf->offsets[m+1]=searched; + }else{ + ret=_bisect_forward_serialno(vf,next,vf->offset, + end,ogg_page_serialno(&og),m+1); + ogg_page_release(&og); + if(ret==OV_EREAD)return OV_EREAD; + } + + vf->offsets[m]=begin; + vf->serialnos[m]=currentno; + return 0; +} + +static int _decode_clear(OggVorbis_File *vf){ + if(vf->ready_state==INITSET){ + vorbis_dsp_destroy(vf->vd); + vf->vd=0; + vf->ready_state=STREAMSET; + } + + if(vf->ready_state>=STREAMSET){ + vorbis_info_clear(&vf->vi); + vorbis_comment_clear(&vf->vc); + vf->ready_state=OPENED; + } + return 0; +} + +/* uses the local ogg_stream storage in vf; this is important for + non-streaming input sources */ +/* consumes the page that's passed in (if any) */ +/* state is LINKSET upon successful return */ + +static int _fetch_headers(OggVorbis_File *vf, + vorbis_info *vi, + vorbis_comment *vc, + ogg_uint32_t *serialno, + ogg_page *og_ptr){ + ogg_page og={0,0,0,0}; + ogg_packet op={0,0,0,0,0,0}; + int i,ret; + + if(vf->ready_state>OPENED)_decode_clear(vf); + + 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; + } + + ogg_stream_reset_serialno(vf->os,ogg_page_serialno(og_ptr)); + if(serialno)*serialno=vf->os->serialno; + + /* extract the initial header from the first page and verify that the + Ogg bitstream is in fact Vorbis data */ + + vorbis_info_init(vi); + vorbis_comment_init(vc); + + i=0; + while(i<3){ + ogg_stream_pagein(vf->os,og_ptr); + while(i<3){ + int result=ogg_stream_packetout(vf->os,&op); + if(result==0)break; + if(result==-1){ + ret=OV_EBADHEADER; + goto bail_header; + } + if((ret=vorbis_dsp_headerin(vi,vc,&op))){ + goto bail_header; + } + i++; + } + if(i<3) + if(_get_next_page(vf,og_ptr,CHUNKSIZE)<0){ + ret=OV_EBADHEADER; + goto bail_header; + } + } + + ogg_packet_release(&op); + ogg_page_release(&og); + vf->ready_state=LINKSET; + return 0; + + bail_header: + ogg_packet_release(&op); + ogg_page_release(&og); + vorbis_info_clear(vi); + vorbis_comment_clear(vc); + vf->ready_state=OPENED; + + return ret; +} + +/* we no longer preload all vorbis_info (and the associated + codec_setup) structs. Call this to seek and fetch the info from + the bitstream, if needed */ +static int _set_link_number(OggVorbis_File *vf,int link){ + if(link != vf->current_link) _decode_clear(vf); + if(vf->ready_state<STREAMSET){ + _seek_helper(vf,vf->offsets[link]); + ogg_stream_reset_serialno(vf->os,vf->serialnos[link]); + vf->current_serialno=vf->serialnos[link]; + vf->current_link=link; + return _fetch_headers(vf,&vf->vi,&vf->vc,&vf->current_serialno,NULL); + } + return 0; +} + +static int _set_link_number_preserve_pos(OggVorbis_File *vf,int link){ + ogg_int64_t pos=vf->offset; + int ret=_set_link_number(vf,link); + if(ret)return ret; + _seek_helper(vf,pos); + if(pos<vf->offsets[link] || pos>=vf->offsets[link+1]) + vf->ready_state=STREAMSET; + return 0; +} + +/* last step of the OggVorbis_File initialization; get all the offset + positions. Only called by the seekable initialization (local + stream storage is hacked slightly; pay attention to how that's + done) */ + +/* this is void and does not propogate errors up because we want to be + able to open and use damaged bitstreams as well as we can. Just + watch out for missing information for links in the OggVorbis_File + struct */ +static void _prefetch_all_offsets(OggVorbis_File *vf, ogg_int64_t dataoffset){ + ogg_page og={0,0,0,0}; + int i; + ogg_int64_t ret; + + vf->dataoffsets=_ogg_malloc(vf->links*sizeof(*vf->dataoffsets)); + vf->pcmlengths=_ogg_malloc(vf->links*2*sizeof(*vf->pcmlengths)); + + for(i=0;i<vf->links;i++){ + if(i==0){ + /* we already grabbed the initial header earlier. Just set the offset */ + vf->dataoffsets[i]=dataoffset; + _seek_helper(vf,dataoffset); + + }else{ + + /* seek to the location of the initial header */ + + _seek_helper(vf,vf->offsets[i]); + if(_fetch_headers(vf,&vf->vi,&vf->vc,NULL,NULL)<0){ + vf->dataoffsets[i]=-1; + }else{ + vf->dataoffsets[i]=vf->offset; + } + } + + /* fetch beginning PCM offset */ + + if(vf->dataoffsets[i]!=-1){ + ogg_int64_t accumulated=0,pos; + long lastblock=-1; + int result; + + ogg_stream_reset_serialno(vf->os,vf->serialnos[i]); + + while(1){ + ogg_packet op={0,0,0,0,0,0}; + + ret=_get_next_page(vf,&og,-1); + if(ret<0) + /* this should not be possible unless the file is + truncated/mangled */ + break; + + if(ogg_page_serialno(&og)!=vf->serialnos[i]) + break; + + pos=ogg_page_granulepos(&og); + + /* 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(&vf->vi,&op); + if(lastblock!=-1) + accumulated+=(lastblock+thisblock)>>2; + lastblock=thisblock; + } + } + ogg_packet_release(&op); + + if(pos!=-1){ + /* pcm offset of last packet on the first audio page */ + accumulated= pos-accumulated; + break; + } + } + + /* 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; + + vf->pcmlengths[i*2]=accumulated; + } + + /* get the PCM length of this link. To do this, + get the last page of the stream */ + { + ogg_int64_t end=vf->offsets[i+1]; + _seek_helper(vf,end); + + while(1){ + ret=_get_prev_page(vf,&og); + if(ret<0){ + /* this should not be possible */ + vorbis_info_clear(&vf->vi); + vorbis_comment_clear(&vf->vc); + break; + } + if(ogg_page_granulepos(&og)!=-1){ + vf->pcmlengths[i*2+1]=ogg_page_granulepos(&og)-vf->pcmlengths[i*2]; + break; + } + vf->offset=ret; + } + } + } + ogg_page_release(&og); +} + +static int _make_decode_ready(OggVorbis_File *vf){ + int i; + switch(vf->ready_state){ + case OPENED: + case STREAMSET: + for(i=0;i<vf->links;i++) + if(vf->offsets[i+1]>=vf->offset)break; + if(i==vf->links)return -1; + i=_set_link_number_preserve_pos(vf,i); + if(i)return i; + /* fall through */ + case LINKSET: + vf->vd=vorbis_dsp_create(&vf->vi); + vf->ready_state=INITSET; + vf->bittrack=0; + vf->samptrack=0; + case INITSET: + return 0; + default: + return -1; + } + +} + +static int _open_seekable2(OggVorbis_File *vf){ + ogg_uint32_t serialno=vf->current_serialno; + ogg_uint32_t tempserialno; + ogg_int64_t dataoffset=vf->offset, end; + ogg_page og={0,0,0,0}; + + /* we're partially open and have a first link header state in + storage in vf */ + /* we can seek, so set out learning all about this file */ + (vf->callbacks.seek_func)(vf->datasource,0,SEEK_END); + vf->offset=vf->end=(vf->callbacks.tell_func)(vf->datasource); + + /* We get the offset for the last page of the physical bitstream. + Most OggVorbis files will contain a single logical bitstream */ + end=_get_prev_page(vf,&og); + if(end<0)return (int)end; + + /* more than one logical bitstream? */ + tempserialno=ogg_page_serialno(&og); + ogg_page_release(&og); + + if(tempserialno!=serialno){ + + /* Chained bitstream. Bisect-search each logical bitstream + section. Do so based on serial number only */ + if(_bisect_forward_serialno(vf,0,0,end+1,serialno,0)<0)return OV_EREAD; + + }else{ + + /* Only one logical bitstream */ + if(_bisect_forward_serialno(vf,0,end,end+1,serialno,0))return OV_EREAD; + + } + + /* the initial header memory is referenced by vf after; don't free it */ + _prefetch_all_offsets(vf,dataoffset); + return ov_raw_seek(vf,0); +} + +/* fetch and process a packet. Handles the case where we're at a + bitstream boundary and dumps the decoding machine. If the decoding + machine is unloaded, it loads it. It also keeps pcm_offset up to + date (seek and read both use this. seek uses a special hack with + readp). + + return: <0) error, OV_HOLE (lost packet) or OV_EOF + 0) need more data (only if readp==0) + 1) got a packet +*/ + +static int _fetch_and_process_packet(OggVorbis_File *vf, + int readp, + int spanp){ + ogg_page og={0,0,0,0}; + ogg_packet op={0,0,0,0,0,0}; + int ret=0; + + /* handle one packet. Try to fetch it from current stream state */ + /* extract packets from page */ + while(1){ + + /* process a packet if we can. If the machine isn't loaded, + neither is a page */ + if(vf->ready_state==INITSET){ + while(1) { + int result=ogg_stream_packetout(vf->os,&op); + ogg_int64_t granulepos; + + if(result<0){ + ret=OV_HOLE; /* hole in the data. */ + goto cleanup; + } + if(result>0){ + /* got a packet. process it */ + granulepos=op.granulepos; + if(!vorbis_dsp_synthesis(vf->vd,&op,1)){ /* lazy check for lazy + header handling. The + header packets aren't + audio, so if/when we + submit them, + vorbis_synthesis will + reject them */ + + vf->samptrack+=vorbis_dsp_pcmout(vf->vd,NULL,0); + vf->bittrack+=op.bytes*8; + + /* update the pcm offset. */ + if(granulepos!=-1 && !op.e_o_s){ + int link=(vf->seekable?vf->current_link:0); + int i,samples; + + /* this packet has a pcm_offset on it (the last packet + completed on a page carries the offset) After processing + (above), we know the pcm position of the *last* sample + ready to be returned. Find the offset of the *first* + + As an aside, this trick is inaccurate if we begin + reading anew right at the last page; the end-of-stream + granulepos declares the last frame in the stream, and the + last packet of the last page may be a partial frame. + So, we need a previous granulepos from an in-sequence page + to have a reference point. Thus the !op.e_o_s clause + above */ + + if(vf->seekable && link>0) + granulepos-=vf->pcmlengths[link*2]; + if(granulepos<0)granulepos=0; /* actually, this + shouldn't be possible + here unless the stream + is very broken */ + + samples=vorbis_dsp_pcmout(vf->vd,NULL,0); + + granulepos-=samples; + for(i=0;i<link;i++) + granulepos+=vf->pcmlengths[i*2+1]; + vf->pcm_offset=granulepos; + } + ret=1; + goto cleanup; + } + } + else + break; + } + } + + if(vf->ready_state>=OPENED){ + int ret; + if(!readp){ + ret=0; + goto cleanup; + } + ret=(int)_get_next_page(vf,&og,-1); + if(ret<0){ + ret=OV_EOF; /* eof. leave unitialized */ + goto cleanup; + } + + /* bitrate tracking; add the header's bytes here, the body bytes + are done by packet above */ + vf->bittrack+=og.header_len*8; + + /* has our decoding just traversed a bitstream boundary? */ + if(vf->ready_state==INITSET){ + if(vf->current_serialno!=ogg_page_serialno(&og)){ + if(!spanp){ + ret=OV_EOF; + goto cleanup; + } + + _decode_clear(vf); + } + } + } + + /* 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,ret; + + if(vf->ready_state<STREAMSET){ + if(vf->seekable){ + vf->current_serialno=ogg_page_serialno(&og); + + /* match the serialno to bitstream section. We use this rather than + offset positions to avoid problems near logical bitstream + boundaries */ + for(link=0;link<vf->links;link++) + if(vf->serialnos[link]==vf->current_serialno)break; + if(link==vf->links){ + ret=OV_EBADLINK; /* sign of a bogus stream. error out, + leave machine uninitialized */ + goto cleanup; + } + + vf->current_link=link; + ret=_fetch_headers(vf,&vf->vi,&vf->vc,&vf->current_serialno,&og); + if(ret) goto cleanup; + + }else{ + /* we're streaming */ + /* fetch the three header packets, build the info struct */ + + int ret=_fetch_headers(vf,&vf->vi,&vf->vc,&vf->current_serialno,&og); + if(ret) goto cleanup; + vf->current_link++; + } + } + + if(_make_decode_ready(vf)) return OV_EBADLINK; + } + ogg_stream_pagein(vf->os,&og); + } + cleanup: + ogg_packet_release(&op); + ogg_page_release(&og); + return ret; +} + +/* if, eg, 64 bit stdio is configured by default, this will build with + fseek64 */ +static int _fseek64_wrap(FILE *f,ogg_int64_t off,int whence){ + if(f==NULL)return -1; + return fseek(f,(long)off,whence); +} + +static int _ov_open1(void *f,OggVorbis_File *vf,char *initial, + long ibytes, ov_callbacks callbacks){ + int offsettest=(f?callbacks.seek_func(f,0,SEEK_CUR):-1); + int ret; + + memset(vf,0,sizeof(*vf)); + + /* Tremor assumes in multiple places that right shift of a signed + integer is an arithmetic shift */ + if( (-1>>1) != -1) return OV_EIMPL; + + vf->datasource=f; + vf->callbacks = callbacks; + + /* init the framing state */ + vf->oy=ogg_sync_create(); + + /* perhaps some data was previously read into a buffer for testing + against other stream types. Allow initialization from this + previously read data (as we may be reading from a non-seekable + stream) */ + if(initial){ + unsigned char *buffer=ogg_sync_bufferin(vf->oy,ibytes); + memcpy(buffer,initial,ibytes); + ogg_sync_wrote(vf->oy,ibytes); + } + + /* can we seek? Stevens suggests the seek test was portable */ + if(offsettest!=-1)vf->seekable=1; + + /* No seeking yet; Set up a 'single' (current) logical bitstream + entry for partial open */ + vf->links=1; + vf->os=ogg_stream_create(-1); /* fill in the serialno later */ + + /* Try to fetch the headers, maintaining all the storage */ + if((ret=_fetch_headers(vf,&vf->vi,&vf->vc,&vf->current_serialno,NULL))<0){ + vf->datasource=NULL; + ov_clear(vf); + }else if(vf->ready_state < PARTOPEN) + vf->ready_state=PARTOPEN; + return ret; +} + +static int _ov_open2(OggVorbis_File *vf){ + if(vf->ready_state < OPENED) + vf->ready_state=OPENED; + if(vf->seekable){ + int ret=_open_seekable2(vf); + if(ret){ + vf->datasource=NULL; + ov_clear(vf); + } + return ret; + } + return 0; +} + + +/* clear out the OggVorbis_File struct */ +int ov_clear(OggVorbis_File *vf){ + if(vf){ + vorbis_dsp_destroy(vf->vd); + vf->vd=0; + ogg_stream_destroy(vf->os); + vorbis_info_clear(&vf->vi); + vorbis_comment_clear(&vf->vc); + if(vf->dataoffsets)_ogg_free(vf->dataoffsets); + if(vf->pcmlengths)_ogg_free(vf->pcmlengths); + if(vf->serialnos)_ogg_free(vf->serialnos); + if(vf->offsets)_ogg_free(vf->offsets); + ogg_sync_destroy(vf->oy); + + if(vf->datasource)(vf->callbacks.close_func)(vf->datasource); + memset(vf,0,sizeof(*vf)); + } +#ifdef DEBUG_LEAKS + _VDBG_dump(); +#endif + return 0; +} + +/* inspects the OggVorbis file and finds/documents all the logical + bitstreams contained in it. Tries to be tolerant of logical + bitstream sections that are truncated/woogie. + + return: -1) error + 0) OK +*/ + +int ov_open_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes, + ov_callbacks callbacks){ + int ret=_ov_open1(f,vf,initial,ibytes,callbacks); + if(ret)return ret; + return _ov_open2(vf); +} + +int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){ + ov_callbacks callbacks = { + (size_t (*)(void *, size_t, size_t, void *)) fread, + (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, + (int (*)(void *)) fclose, + (long (*)(void *)) ftell + }; + + return ov_open_callbacks((void *)f, vf, initial, ibytes, callbacks); +} + +/* Only partially open the vorbis file; test for Vorbisness, and load + the headers for the first chain. Do not seek (although test for + seekability). Use ov_test_open to finish opening the file, else + ov_clear to close/free it. Same return codes as open. */ + +int ov_test_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes, + ov_callbacks callbacks) +{ + return _ov_open1(f,vf,initial,ibytes,callbacks); +} + +int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){ + ov_callbacks callbacks = { + (size_t (*)(void *, size_t, size_t, void *)) fread, + (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, + (int (*)(void *)) fclose, + (long (*)(void *)) ftell + }; + + return ov_test_callbacks((void *)f, vf, initial, ibytes, callbacks); +} + +int ov_test_open(OggVorbis_File *vf){ + if(vf->ready_state!=PARTOPEN)return OV_EINVAL; + return _ov_open2(vf); +} + +/* How many logical bitstreams in this physical bitstream? */ +long ov_streams(OggVorbis_File *vf){ + return vf->links; +} + +/* Is the FILE * associated with vf seekable? */ +long ov_seekable(OggVorbis_File *vf){ + return vf->seekable; +} + +/* returns the bitrate for a given logical bitstream or the entire + physical bitstream. If the file is open for random access, it will + find the *actual* average bitrate. If the file is streaming, it + returns the nominal bitrate (if set) else the average of the + upper/lower bounds (if set) else -1 (unset). + + If you want the actual bitrate field settings, get them from the + vorbis_info structs */ + +long ov_bitrate(OggVorbis_File *vf,int i){ + if(vf->ready_state<OPENED)return OV_EINVAL; + if(i>=vf->links)return OV_EINVAL; + if(!vf->seekable && i!=0)return ov_bitrate(vf,0); + if(i<0){ + ogg_int64_t bits=0; + int i; + for(i=0;i<vf->links;i++) + bits+=(vf->offsets[i+1]-vf->dataoffsets[i])*8; + /* This once read: return(rint(bits/ov_time_total(vf,-1))); + * gcc 3.x on x86 miscompiled this at optimisation level 2 and above, + * so this is slightly transformed to make it work. + */ + return (long)(bits*1000/ov_time_total(vf,-1)); + }else{ + if(vf->seekable){ + /* return the actual bitrate */ + return (long)((vf->offsets[i+1]-vf->dataoffsets[i])*8000/ov_time_total(vf,i)); + }else{ + /* return nominal if set */ + if(vf->vi.bitrate_nominal>0){ + return vf->vi.bitrate_nominal; + }else{ + if(vf->vi.bitrate_upper>0){ + if(vf->vi.bitrate_lower>0){ + return (vf->vi.bitrate_upper+vf->vi.bitrate_lower)/2; + }else{ + return vf->vi.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){ + long ret; + if(vf->ready_state<OPENED)return OV_EINVAL; + if(vf->samptrack==0)return OV_FALSE; + ret=(long)(vf->bittrack/vf->samptrack*vf->vi.rate); + vf->bittrack=0; + vf->samptrack=0; + return ret; +} + +/* Guess */ +long ov_serialnumber(OggVorbis_File *vf,int i){ + if(i>=vf->links)return ov_serialnumber(vf,vf->links-1); + if(!vf->seekable && i>=0)return ov_serialnumber(vf,-1); + if(i<0){ + return vf->current_serialno; + }else{ + return vf->serialnos[i]; + } +} + +/* returns: total raw (compressed) length of content if i==-1 + raw (compressed) length of that logical bitstream for i==0 to n + OV_EINVAL if the stream is not seekable (we can't know the length) + or if stream is only partially open +*/ +ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i){ + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable || i>=vf->links)return OV_EINVAL; + if(i<0){ + ogg_int64_t acc=0; + int i; + for(i=0;i<vf->links;i++) + acc+=ov_raw_total(vf,i); + return acc; + }else{ + return vf->offsets[i+1]-vf->offsets[i]; + } +} + +/* returns: total PCM length (samples) of content if i==-1 PCM length + (samples) of that logical bitstream for i==0 to n + OV_EINVAL if the stream is not seekable (we can't know the + length) or only partially open +*/ +ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i){ + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable || i>=vf->links)return OV_EINVAL; + if(i<0){ + ogg_int64_t acc=0; + int i; + for(i=0;i<vf->links;i++) + acc+=ov_pcm_total(vf,i); + return acc; + }else{ + return vf->pcmlengths[i*2+1]; + } +} + +/* returns: total milliseconds of content if i==-1 + milliseconds in that logical bitstream for i==0 to n + OV_EINVAL if the stream is not seekable (we can't know the + length) or only partially open +*/ +ogg_int64_t ov_time_total(OggVorbis_File *vf,int i){ + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable || i>=vf->links)return OV_EINVAL; + if(i<0){ + ogg_int64_t acc=0; + int i; + for(i=0;i<vf->links;i++) + acc+=ov_time_total(vf,i); + return acc; + }else{ + return ((ogg_int64_t)vf->pcmlengths[i*2+1])*1000/vf->vi.rate; + } +} + +/* seek to an offset relative to the *compressed* data. This also + scans packets to update the PCM cursor. It will cross a logical + bitstream boundary, but only if it can't get any packets out of the + tail of the bitstream we seek to (so no surprises). + + returns zero on success, nonzero on failure */ + +int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos){ + ogg_stream_state *work_os=NULL; + ogg_page og={0,0,0,0}; + ogg_packet op={0,0,0,0,0,0}; + + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable) + return OV_ENOSEEK; /* don't dump machine if we can't seek */ + + if(pos<0 || pos>vf->end)return OV_EINVAL; + + /* don't yet clear out decoding machine (if it's initialized), in + the case we're in the same link. Restart the decode lapping, and + let _fetch_and_process_packet deal with a potential bitstream + boundary */ + vf->pcm_offset=-1; + ogg_stream_reset_serialno(vf->os, + vf->current_serialno); /* must set serialno */ + vorbis_dsp_restart(vf->vd); + + _seek_helper(vf,pos); + + /* we need to make sure the pcm_offset is set, but we don't want to + advance the raw cursor past good packets just to get to the first + with a granulepos. That's not equivalent behavior to beginning + decoding as immediately after the seek position as possible. + + So, a hack. We use two stream states; a local scratch state and + the shared vf->os stream state. We use the local state to + scan, and the shared state as a buffer for later decode. + + Unfortuantely, on the last page we still advance to last packet + because the granulepos on the last page is not necessarily on a + packet boundary, and we need to make sure the granpos is + correct. + */ + + { + int lastblock=0; + int accblock=0; + int thisblock; + int eosflag; + + work_os=ogg_stream_create(vf->current_serialno); /* get the memory ready */ + while(1){ + if(vf->ready_state>=STREAMSET){ + /* snarf/scan a packet if we can */ + int result=ogg_stream_packetout(work_os,&op); + + if(result>0){ + + if(vf->vi.codec_setup){ + thisblock=vorbis_packet_blocksize(&vf->vi,&op); + if(thisblock<0){ + ogg_stream_packetout(vf->os,NULL); + thisblock=0; + }else{ + + if(eosflag) + ogg_stream_packetout(vf->os,NULL); + else + if(lastblock)accblock+=(lastblock+thisblock)>>2; + } + + if(op.granulepos!=-1){ + int i,link=vf->current_link; + ogg_int64_t granulepos=op.granulepos-vf->pcmlengths[link*2]; + if(granulepos<0)granulepos=0; + + for(i=0;i<link;i++) + granulepos+=vf->pcmlengths[i*2+1]; + vf->pcm_offset=granulepos-accblock; + break; + } + lastblock=thisblock; + continue; + }else + ogg_stream_packetout(vf->os,NULL); + } + } + + if(!lastblock){ + if(_get_next_page(vf,&og,-1)<0){ + vf->pcm_offset=ov_pcm_total(vf,-1); + break; + } + }else{ + /* huh? Bogus stream with packets but no granulepos */ + vf->pcm_offset=-1; + break; + } + + /* did we just grab a page from other than current link? */ + if(vf->ready_state>=STREAMSET) + if(vf->current_serialno!=ogg_page_serialno(&og)){ + _decode_clear(vf); /* clear out stream state */ + ogg_stream_destroy(work_os); + } + + if(vf->ready_state<STREAMSET){ + int link; + + vf->current_serialno=ogg_page_serialno(&og); + for(link=0;link<vf->links;link++) + if(vf->serialnos[link]==vf->current_serialno)break; + if(link==vf->links) + goto seek_error; /* sign of a bogus stream. error out, + leave machine uninitialized */ + + /* need to initialize machine to this link */ + { + int ret=_set_link_number_preserve_pos(vf,link); + if(ret) goto seek_error; + } + ogg_stream_reset_serialno(vf->os,vf->current_serialno); + ogg_stream_reset_serialno(work_os,vf->current_serialno); + + + } + + { + ogg_page dup; + ogg_page_dup(&dup,&og); + eosflag=ogg_page_eos(&og); + ogg_stream_pagein(vf->os,&og); + ogg_stream_pagein(work_os,&dup); + } + } + } + + ogg_packet_release(&op); + ogg_page_release(&og); + ogg_stream_destroy(work_os); + vf->bittrack=0; + vf->samptrack=0; + return 0; + + seek_error: + ogg_packet_release(&op); + ogg_page_release(&og); + + /* dump the machine so we're in a known state */ + vf->pcm_offset=-1; + ogg_stream_destroy(work_os); + _decode_clear(vf); + return OV_EBADLINK; +} + +/* Page granularity seek (faster than sample granularity because we + don't do the last bit of decode to find a specific sample). + + Seek to the last [granule marked] page preceeding the specified pos + location, such that decoding past the returned point will quickly + arrive at the requested position. */ +int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos){ + int link=-1; + ogg_int64_t result=0; + ogg_int64_t total=ov_pcm_total(vf,-1); + ogg_page og={0,0,0,0}; + ogg_packet op={0,0,0,0,0,0}; + + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable)return OV_ENOSEEK; + if(pos<0 || pos>total)return OV_EINVAL; + + /* which bitstream section does this pcm offset occur in? */ + for(link=vf->links-1;link>=0;link--){ + total-=vf->pcmlengths[link*2+1]; + if(pos>=total)break; + } + + + if(link!=vf->current_link){ + int ret=_set_link_number(vf,link); + if(ret) goto seek_error; + }else{ + vorbis_dsp_restart(vf->vd); + } + + ogg_stream_reset_serialno(vf->os,vf->serialnos[link]); + + /* search within the logical bitstream for the page with the highest + pcm_pos preceeding (or equal to) pos. There is a danger here; + missing pages or incorrect frame number information in the + bitstream could make our task impossible. Account for that (it + would be an error condition) */ + + /* new search algorithm by HB (Nicholas Vinen) */ + { + ogg_int64_t end=vf->offsets[link+1]; + ogg_int64_t begin=vf->offsets[link]; + ogg_int64_t begintime = vf->pcmlengths[link*2]; + ogg_int64_t endtime = vf->pcmlengths[link*2+1]+begintime; + ogg_int64_t target=pos-total+begintime; + ogg_int64_t best=begin; + + while(begin<end){ + ogg_int64_t bisect; + + if(end-begin<CHUNKSIZE){ + bisect=begin; + }else{ + /* take a (pretty decent) guess. */ + bisect=begin + + (target-begintime)*(end-begin)/(endtime-begintime) - CHUNKSIZE; + if(bisect<=begin) + bisect=begin+1; + } + + _seek_helper(vf,bisect); + + while(begin<end){ + result=_get_next_page(vf,&og,end-vf->offset); + if(result==OV_EREAD) goto seek_error; + if(result<0){ + if(bisect<=begin+1) + end=begin; /* found it */ + else{ + if(bisect==0) goto seek_error; + bisect-=CHUNKSIZE; + if(bisect<=begin)bisect=begin+1; + _seek_helper(vf,bisect); + } + }else{ + ogg_int64_t granulepos=ogg_page_granulepos(&og); + if(granulepos==-1)continue; + if(granulepos<target){ + best=result; /* raw offset of packet with granulepos */ + begin=vf->offset; /* raw offset of next page */ + begintime=granulepos; + + if(target-begintime>44100)break; + bisect=begin; /* *not* begin + 1 */ + }else{ + if(bisect<=begin+1) + end=begin; /* found it */ + else{ + if(end==vf->offset){ /* we're pretty close - we'd be stuck in */ + end=result; + bisect-=CHUNKSIZE; /* an endless loop otherwise. */ + if(bisect<=begin)bisect=begin+1; + _seek_helper(vf,bisect); + }else{ + end=result; + endtime=granulepos; + break; + } + } + } + } + } + } + + /* found our page. seek to it, update pcm offset. Easier case than + raw_seek, don't keep packets preceeding granulepos. */ + { + + /* seek */ + _seek_helper(vf,best); + vf->pcm_offset=-1; + + if(_get_next_page(vf,&og,-1)<0){ + ogg_page_release(&og); + return OV_EOF; /* shouldn't happen */ + } + + ogg_stream_pagein(vf->os,&og); + + /* pull out all but last packet; the one with granulepos */ + while(1){ + result=ogg_stream_packetpeek(vf->os,&op); + if(result==0){ + /* !!! the packet finishing this page originated on a + preceeding page. Keep fetching previous pages until we + get one with a granulepos or without the 'continued' flag + set. Then just use raw_seek for simplicity. */ + + _seek_helper(vf,best); + + while(1){ + result=_get_prev_page(vf,&og); + if(result<0) goto seek_error; + if(ogg_page_granulepos(&og)>-1 || + !ogg_page_continued(&og)){ + return ov_raw_seek(vf,result); + } + vf->offset=result; + } + } + if(result<0){ + result = OV_EBADPACKET; + goto seek_error; + } + if(op.granulepos!=-1){ + vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; + if(vf->pcm_offset<0)vf->pcm_offset=0; + vf->pcm_offset+=total; + break; + }else + result=ogg_stream_packetout(vf->os,NULL); + } + } + } + + /* verify result */ + if(vf->pcm_offset>pos || pos>ov_pcm_total(vf,-1)){ + result=OV_EFAULT; + goto seek_error; + } + vf->bittrack=0; + vf->samptrack=0; + + ogg_page_release(&og); + ogg_packet_release(&op); + return 0; + + seek_error: + + ogg_page_release(&og); + ogg_packet_release(&op); + + /* dump machine so we're in a known state */ + vf->pcm_offset=-1; + _decode_clear(vf); + return (int)result; +} + +/* seek to a sample offset relative to the decompressed pcm stream + returns zero on success, nonzero on failure */ + +int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos){ + ogg_packet op={0,0,0,0,0,0}; + ogg_page og={0,0,0,0}; + int thisblock,lastblock=0; + int ret=ov_pcm_seek_page(vf,pos); + if(ret<0)return ret; + if(_make_decode_ready(vf))return OV_EBADLINK; + + /* discard leading packets we don't need for the lapping of the + position we want; don't decode them */ + + while(1){ + + int ret=ogg_stream_packetpeek(vf->os,&op); + if(ret>0){ + thisblock=vorbis_packet_blocksize(&vf->vi,&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_dsp_synthesis(vf->vd,&op,0); /* set up a vb with + only tracking, no + pcm_decode */ + + /* end of logical stream case is hard, especially with exact + length positioning. */ + + if(op.granulepos>-1){ + int i; + /* always believe the stream markers */ + vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; + if(vf->pcm_offset<0)vf->pcm_offset=0; + for(i=0;i<vf->current_link;i++) + vf->pcm_offset+=vf->pcmlengths[i*2+1]; + } + + lastblock=thisblock; + + }else{ + if(ret<0 && ret!=OV_HOLE)break; + + /* suck in a new page */ + if(_get_next_page(vf,&og,-1)<0)break; + if(vf->current_serialno!=ogg_page_serialno(&og))_decode_clear(vf); + + if(vf->ready_state<STREAMSET){ + int link,ret; + + vf->current_serialno=ogg_page_serialno(&og); + for(link=0;link<vf->links;link++) + if(vf->serialnos[link]==vf->current_serialno)break; + if(link==vf->links){ + ogg_page_release(&og); + ogg_packet_release(&op); + return OV_EBADLINK; + } + + + vf->current_link=link; + ret=_fetch_headers(vf,&vf->vi,&vf->vc,&vf->current_serialno,&og); + if(ret) return ret; + if(_make_decode_ready(vf))return OV_EBADLINK; + lastblock=0; + } + + ogg_stream_pagein(vf->os,&og); + } + } + + vf->bittrack=0; + vf->samptrack=0; + /* discard samples until we reach the desired position. Crossing a + logical bitstream boundary with abandon is OK. */ + while(vf->pcm_offset<pos){ + ogg_int64_t target=pos-vf->pcm_offset; + long samples=vorbis_dsp_pcmout(vf->vd,NULL,0); + + if(samples>target)samples=(long)target; + vorbis_dsp_read(vf->vd,samples); + vf->pcm_offset+=samples; + + if(samples<target) + if(_fetch_and_process_packet(vf,1,1)<=0) + vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */ + } + + ogg_page_release(&og); + ogg_packet_release(&op); + return 0; +} + +/* seek to a playback time relative to the decompressed pcm stream + returns zero on success, nonzero on failure */ +int ov_time_seek(OggVorbis_File *vf,ogg_int64_t milliseconds){ + /* translate time to PCM position and call ov_pcm_seek */ + + int link=-1; + ogg_int64_t pcm_total=ov_pcm_total(vf,-1); + ogg_int64_t time_total=ov_time_total(vf,-1); + + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable)return OV_ENOSEEK; + if(milliseconds<0 || milliseconds>time_total)return OV_EINVAL; + + /* which bitstream section does this time offset occur in? */ + for(link=vf->links-1;link>=0;link--){ + pcm_total-=vf->pcmlengths[link*2+1]; + time_total-=ov_time_total(vf,link); + if(milliseconds>=time_total)break; + } + + /* enough information to convert time offset to pcm offset */ + { + int ret=_set_link_number(vf,link); + if(ret)return ret; + return + ov_pcm_seek(vf,pcm_total+(milliseconds-time_total)* + vf->vi.rate/1000); + } +} + +/* page-granularity version of ov_time_seek + returns zero on success, nonzero on failure */ +int ov_time_seek_page(OggVorbis_File *vf,ogg_int64_t milliseconds){ + /* translate time to PCM position and call ov_pcm_seek */ + + int link=-1; + ogg_int64_t pcm_total=ov_pcm_total(vf,-1); + ogg_int64_t time_total=ov_time_total(vf,-1); + + if(vf->ready_state<OPENED)return OV_EINVAL; + if(!vf->seekable)return OV_ENOSEEK; + if(milliseconds<0 || milliseconds>time_total)return OV_EINVAL; + + /* which bitstream section does this time offset occur in? */ + for(link=vf->links-1;link>=0;link--){ + pcm_total-=vf->pcmlengths[link*2+1]; + time_total-=ov_time_total(vf,link); + if(milliseconds>=time_total)break; + } + + /* enough information to convert time offset to pcm offset */ + { + int ret=_set_link_number(vf,link); + if(ret)return ret; + return + ov_pcm_seek_page(vf,pcm_total+(milliseconds-time_total)* + vf->vi.rate/1000); + } +} + +/* tell the current stream offset cursor. Note that seek followed by + tell will likely not give the set offset due to caching */ +ogg_int64_t ov_raw_tell(OggVorbis_File *vf){ + if(vf->ready_state<OPENED)return OV_EINVAL; + return vf->offset; +} + +/* return PCM offset (sample) of next PCM sample to be read */ +ogg_int64_t ov_pcm_tell(OggVorbis_File *vf){ + if(vf->ready_state<OPENED)return OV_EINVAL; + return vf->pcm_offset; +} + +/* return time offset (milliseconds) of next PCM sample to be read */ +ogg_int64_t ov_time_tell(OggVorbis_File *vf){ + int link=0; + ogg_int64_t pcm_total=0; + ogg_int64_t time_total=0; + + if(vf->ready_state<OPENED)return OV_EINVAL; + if(vf->seekable){ + pcm_total=ov_pcm_total(vf,-1); + time_total=ov_time_total(vf,-1); + + /* which bitstream section does this time offset occur in? */ + for(link=vf->links-1;link>=0;link--){ + pcm_total-=vf->pcmlengths[link*2+1]; + time_total-=ov_time_total(vf,link); + if(vf->pcm_offset>=pcm_total)break; + } + } + + return time_total+(1000*vf->pcm_offset-pcm_total)/vf->vi.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>=vf->links)return NULL; + if(link>=0){ + int ret=_set_link_number_preserve_pos(vf,link); + if(ret)return NULL; + } + } + 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>=vf->links)return NULL; + if(link>=0){ + int ret=_set_link_number_preserve_pos(vf,link); + if(ret)return NULL; + } + } + return &vf->vc; +} + +/* up to this point, everything could more or less hide the multiple + logical bitstream nature of chaining from the toplevel application + if the toplevel application didn't particularly care. However, at + the point that we actually read audio back, the multiple-section + nature must surface: Multiple bitstream sections do not necessarily + have to have the same number of channels or sampling rate. + + ov_read returns the sequential logical bitstream number currently + being decoded along with the PCM data in order that the toplevel + application can take action on channel/sample rate changes. This + number will be incremented even for streamed (non-seekable) streams + (for seekable streams, it represents the actual logical bitstream + index within the physical bitstream. Note that the accessor + functions above are aware of this dichotomy). + + input values: buffer) a buffer to hold packed PCM data for return + length) the byte length requested to be placed into buffer + + return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL) + 0) EOF + n) number of bytes of PCM actually returned. The + below works on a packet-by-packet basis, so the + return length is not related to the 'length' passed + in, just guaranteed to fit. + + *section) set to the logical bitstream number */ + +long ov_read(OggVorbis_File *vf,void *buffer,int bytes_req,int *bitstream){ + + long samples; + long channels; + + if(vf->ready_state<OPENED)return OV_EINVAL; + + while(1){ + if(vf->ready_state==INITSET){ + channels=vf->vi.channels; + samples=vorbis_dsp_pcmout(vf->vd,buffer,(bytes_req>>1)/channels); + if(samples){ + if(samples>0){ + vorbis_dsp_read(vf->vd,samples); + vf->pcm_offset+=samples; + if(bitstream)*bitstream=vf->current_link; + return samples*2*channels; + } + return samples; + } + } + + /* suck in another packet */ + { + int ret=_fetch_and_process_packet(vf,1,1); + if(ret==OV_EOF) + return 0; + if(ret<=0) + return ret; + } + + } +} |