+++ /dev/null
-/********************************************************************
- * *
- * 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 1994-2007 *
- * by the Xiph.Org Foundation http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: simple example decoder
- last mod: $Id: decoder_example.c 13293 2007-07-24 00:09:47Z xiphmont $
-
- ********************************************************************/
-
-/* Takes a vorbis bitstream from stdin and writes raw stereo PCM to
- stdout. Decodes simple and chained OggVorbis files from beginning
- to end. Vorbisfile.a is somewhat more complex than the code below. */
-
-/* Note that this is POSIX, not ANSI code */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <vorbis/codec.h>
-
-#ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
-#include <io.h>
-#include <fcntl.h>
-#endif
-
-#if defined(__MACOS__) && defined(__MWERKS__)
-#include <console.h> /* CodeWarrior's Mac "command-line" support */
-#endif
-
-ogg_int16_t convbuffer[4096]; /* take 8k out of the data segment, not the stack */
-int convsize=4096;
-
-extern void _VDBG_dump(void);
-
-int main(){
- ogg_sync_state oy; /* sync and verify incoming physical bitstream */
- ogg_stream_state os; /* take physical pages, weld into a logical
- stream of packets */
- ogg_page og; /* one Ogg bitstream page. Vorbis packets are inside */
- ogg_packet op; /* one raw packet of data for decode */
-
- vorbis_info vi; /* struct that stores all the static vorbis bitstream
- settings */
- vorbis_comment vc; /* struct that stores all the bitstream user comments */
- vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
- vorbis_block vb; /* local working space for packet->PCM decode */
-
- char *buffer;
- int bytes;
-
-#ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
- /* Beware the evil ifdef. We avoid these where we can, but this one we
- cannot. Don't add any more, you'll probably go to hell if you do. */
- _setmode( _fileno( stdin ), _O_BINARY );
- _setmode( _fileno( stdout ), _O_BINARY );
-#endif
-
-#if defined(macintosh) && defined(__MWERKS__)
- {
- int argc;
- char **argv;
- argc=ccommand(&argv); /* get a "command line" from the Mac user */
- /* this also lets the user set stdin and stdout */
- }
-#endif
-
- /********** Decode setup ************/
-
- ogg_sync_init(&oy); /* Now we can read pages */
-
- while(1){ /* we repeat if the bitstream is chained */
- int eos=0;
- int i;
-
- /* grab some data at the head of the stream. We want the first page
- (which is guaranteed to be small and only contain the Vorbis
- stream initial header) We need the first page to get the stream
- serialno. */
-
- /* submit a 4k block to libvorbis' Ogg layer */
- buffer=ogg_sync_buffer(&oy,4096);
- bytes=fread(buffer,1,4096,stdin);
- ogg_sync_wrote(&oy,bytes);
-
- /* Get the first page. */
- if(ogg_sync_pageout(&oy,&og)!=1){
- /* have we simply run out of data? If so, we're done. */
- if(bytes<4096)break;
-
- /* error case. Must not be Vorbis data */
- fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
- exit(1);
- }
-
- /* Get the serial number and set up the rest of decode. */
- /* serialno first; use it to set up a logical stream */
- ogg_stream_init(&os,ogg_page_serialno(&og));
-
- /* extract the initial header from the first page and verify that the
- Ogg bitstream is in fact Vorbis data */
-
- /* I handle the initial header first instead of just having the code
- read all three Vorbis headers at once because reading the initial
- header is an easy way to identify a Vorbis bitstream and it's
- useful to see that functionality seperated out. */
-
- vorbis_info_init(&vi);
- vorbis_comment_init(&vc);
- if(ogg_stream_pagein(&os,&og)<0){
- /* error; stream version mismatch perhaps */
- fprintf(stderr,"Error reading first page of Ogg bitstream data.\n");
- exit(1);
- }
-
- if(ogg_stream_packetout(&os,&op)!=1){
- /* no page? must not be vorbis */
- fprintf(stderr,"Error reading initial header packet.\n");
- exit(1);
- }
-
- if(vorbis_synthesis_headerin(&vi,&vc,&op)<0){
- /* error case; not a vorbis header */
- fprintf(stderr,"This Ogg bitstream does not contain Vorbis "
- "audio data.\n");
- exit(1);
- }
-
- /* At this point, we're sure we're Vorbis. We've set up the logical
- (Ogg) bitstream decoder. Get the comment and codebook headers and
- set up the Vorbis decoder */
-
- /* The next two packets in order are the comment and codebook headers.
- They're likely large and may span multiple pages. Thus we reead
- and submit data until we get our two pacakets, watching that no
- pages are missing. If a page is missing, error out; losing a
- header page is the only place where missing data is fatal. */
-
- i=0;
- while(i<2){
- while(i<2){
- int result=ogg_sync_pageout(&oy,&og);
- if(result==0)break; /* Need more data */
- /* Don't complain about missing or corrupt data yet. We'll
- catch it at the packet output phase */
- if(result==1){
- ogg_stream_pagein(&os,&og); /* we can ignore any errors here
- as they'll also become apparent
- at packetout */
- while(i<2){
- result=ogg_stream_packetout(&os,&op);
- if(result==0)break;
- if(result<0){
- /* Uh oh; data at some point was corrupted or missing!
- We can't tolerate that in a header. Die. */
- fprintf(stderr,"Corrupt secondary header. Exiting.\n");
- exit(1);
- }
- vorbis_synthesis_headerin(&vi,&vc,&op);
- i++;
- }
- }
- }
- /* no harm in not checking before adding more */
- buffer=ogg_sync_buffer(&oy,4096);
- bytes=fread(buffer,1,4096,stdin);
- if(bytes==0 && i<2){
- fprintf(stderr,"End of file before finding all Vorbis headers!\n");
- exit(1);
- }
- ogg_sync_wrote(&oy,bytes);
- }
-
- /* Throw the comments plus a few lines about the bitstream we're
- decoding */
- {
- char **ptr=vc.user_comments;
- while(*ptr){
- fprintf(stderr,"%s\n",*ptr);
- ++ptr;
- }
- fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi.channels,vi.rate);
- fprintf(stderr,"Encoded by: %s\n\n",vc.vendor);
- }
-
- convsize=4096/vi.channels;
-
- /* OK, got and parsed all three headers. Initialize the Vorbis
- packet->PCM decoder. */
- vorbis_synthesis_init(&vd,&vi); /* central decode state */
- vorbis_block_init(&vd,&vb); /* local state for most of the decode
- so multiple block decodes can
- proceed in parallel. We could init
- multiple vorbis_block structures
- for vd here */
-
- /* The rest is just a straight decode loop until end of stream */
- while(!eos){
- while(!eos){
- int result=ogg_sync_pageout(&oy,&og);
- if(result==0)break; /* need more data */
- if(result<0){ /* missing or corrupt data at this page position */
- fprintf(stderr,"Corrupt or missing data in bitstream; "
- "continuing...\n");
- }else{
- ogg_stream_pagein(&os,&og); /* can safely ignore errors at
- this point */
- while(1){
- result=ogg_stream_packetout(&os,&op);
-
- if(result==0)break; /* need more data */
- if(result<0){ /* missing or corrupt data at this page position */
- /* no reason to complain; already complained above */
- }else{
- /* we have a packet. Decode it */
- float **pcm;
- int samples;
-
- if(vorbis_synthesis(&vb,&op)==0) /* test for success! */
- vorbis_synthesis_blockin(&vd,&vb);
- /*
-
- **pcm is a multichannel float vector. In stereo, for
- example, pcm[0] is left, and pcm[1] is right. samples is
- the size of each channel. Convert the float values
- (-1.<=range<=1.) to whatever PCM format and write it out */
-
- while((samples=vorbis_synthesis_pcmout(&vd,&pcm))>0){
- int j;
- int clipflag=0;
- int bout=(samples<convsize?samples:convsize);
-
- /* convert floats to 16 bit signed ints (host order) and
- interleave */
- for(i=0;i<vi.channels;i++){
- ogg_int16_t *ptr=convbuffer+i;
- float *mono=pcm[i];
- for(j=0;j<bout;j++){
-#if 1
- int val=mono[j]*32767.f;
-#else /* optional dither */
- int val=mono[j]*32767.f+drand48()-0.5f;
-#endif
- /* might as well guard against clipping */
- if(val>32767){
- val=32767;
- clipflag=1;
- }
- if(val<-32768){
- val=-32768;
- clipflag=1;
- }
- *ptr=val;
- ptr+=vi.channels;
- }
- }
-
- if(clipflag)
- fprintf(stderr,"Clipping in frame %ld\n",(long)(vd.sequence));
-
-
- fwrite(convbuffer,2*vi.channels,bout,stdout);
-
- vorbis_synthesis_read(&vd,bout); /* tell libvorbis how
- many samples we
- actually consumed */
- }
- }
- }
- if(ogg_page_eos(&og))eos=1;
- }
- }
- if(!eos){
- buffer=ogg_sync_buffer(&oy,4096);
- bytes=fread(buffer,1,4096,stdin);
- ogg_sync_wrote(&oy,bytes);
- if(bytes==0)eos=1;
- }
- }
-
- /* clean up this logical bitstream; before exit we see if we're
- followed by another [chained] */
-
- ogg_stream_clear(&os);
-
- /* ogg_page and ogg_packet structs always point to storage in
- libvorbis. They're never freed or manipulated directly */
-
- vorbis_block_clear(&vb);
- vorbis_dsp_clear(&vd);
- vorbis_comment_clear(&vc);
- vorbis_info_clear(&vi); /* must be called last */
- }
-
- /* OK, clean up the framer */
- ogg_sync_clear(&oy);
-
- fprintf(stderr,"Done.\n");
- return(0);
-}
projects / vuplus_xbmc / blobdiff