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Diffstat (limited to 'contrib/vorbis/examples/encoder_example.c')
| -rw-r--r-- | contrib/vorbis/examples/encoder_example.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/contrib/vorbis/examples/encoder_example.c b/contrib/vorbis/examples/encoder_example.c deleted file mode 100644 index d46a051..0000000 --- a/contrib/vorbis/examples/encoder_example.c +++ /dev/null @@ -1,251 +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 1994-2007 * - * by the Xiph.Org Foundation http://www.xiph.org/ * - * * - ******************************************************************** - - function: simple example encoder - - ********************************************************************/ - -/* takes a stereo 16bit 44.1kHz WAV file from stdin and encodes it into - a Vorbis bitstream */ - -/* Note that this is POSIX, not ANSI, code */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <math.h> -#include <vorbis/vorbisenc.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 - -#define READ 1024 -signed char readbuffer[READ*4+44]; /* out of the data segment, not the stack */ - -int main(){ - 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 user comments */ - - vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */ - vorbis_block vb; /* local working space for packet->PCM decode */ - - int eos=0,ret; - int i, founddata; - -#if defined(macintosh) && defined(__MWERKS__) - int argc = 0; - char **argv = NULL; - argc = ccommand(&argv); /* get a "command line" from the Mac user */ - /* this also lets the user set stdin and stdout */ -#endif - - /* we cheat on the WAV header; we just bypass 44 bytes (simplest WAV - header is 44 bytes) and assume that the data is 44.1khz, stereo, 16 bit - little endian pcm samples. This is just an example, after all. */ - -#ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */ - /* if we were reading/writing a file, it would also need to in - binary mode, eg, fopen("file.wav","wb"); */ - /* 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 - - - /* we cheat on the WAV header; we just bypass the header and never - verify that it matches 16bit/stereo/44.1kHz. This is just an - example, after all. */ - - readbuffer[0] = '\0'; - for (i=0, founddata=0; i<30 && ! feof(stdin) && ! ferror(stdin); i++) - { - fread(readbuffer,1,2,stdin); - - if ( ! strncmp((char*)readbuffer, "da", 2) ){ - founddata = 1; - fread(readbuffer,1,6,stdin); - break; - } - } - - /********** Encode setup ************/ - - vorbis_info_init(&vi); - - /* choose an encoding mode. A few possibilities commented out, one - actually used: */ - - /********************************************************************* - Encoding using a VBR quality mode. The usable range is -.1 - (lowest quality, smallest file) to 1. (highest quality, largest file). - Example quality mode .4: 44kHz stereo coupled, roughly 128kbps VBR - - ret = vorbis_encode_init_vbr(&vi,2,44100,.4); - - --------------------------------------------------------------------- - - Encoding using an average bitrate mode (ABR). - example: 44kHz stereo coupled, average 128kbps VBR - - ret = vorbis_encode_init(&vi,2,44100,-1,128000,-1); - - --------------------------------------------------------------------- - - Encode using a quality mode, but select that quality mode by asking for - an approximate bitrate. This is not ABR, it is true VBR, but selected - using the bitrate interface, and then turning bitrate management off: - - ret = ( vorbis_encode_setup_managed(&vi,2,44100,-1,128000,-1) || - vorbis_encode_ctl(&vi,OV_ECTL_RATEMANAGE2_SET,NULL) || - vorbis_encode_setup_init(&vi)); - - *********************************************************************/ - - ret=vorbis_encode_init_vbr(&vi,2,44100,0.1); - - /* do not continue if setup failed; this can happen if we ask for a - mode that libVorbis does not support (eg, too low a bitrate, etc, - will return 'OV_EIMPL') */ - - if(ret)exit(1); - - /* add a comment */ - vorbis_comment_init(&vc); - vorbis_comment_add_tag(&vc,"ENCODER","encoder_example.c"); - - /* set up the analysis state and auxiliary encoding storage */ - vorbis_analysis_init(&vd,&vi); - vorbis_block_init(&vd,&vb); - - /* set up our packet->stream encoder */ - /* pick a random serial number; that way we can more likely build - chained streams just by concatenation */ - srand(time(NULL)); - ogg_stream_init(&os,rand()); - - /* Vorbis streams begin with three headers; the initial header (with - most of the codec setup parameters) which is mandated by the Ogg - bitstream spec. The second header holds any comment fields. The - third header holds the bitstream codebook. We merely need to - make the headers, then pass them to libvorbis one at a time; - libvorbis handles the additional Ogg bitstream constraints */ - - { - ogg_packet header; - ogg_packet header_comm; - ogg_packet header_code; - - vorbis_analysis_headerout(&vd,&vc,&header,&header_comm,&header_code); - ogg_stream_packetin(&os,&header); /* automatically placed in its own - page */ - ogg_stream_packetin(&os,&header_comm); - ogg_stream_packetin(&os,&header_code); - - /* This ensures the actual - * audio data will start on a new page, as per spec - */ - while(!eos){ - int result=ogg_stream_flush(&os,&og); - if(result==0)break; - fwrite(og.header,1,og.header_len,stdout); - fwrite(og.body,1,og.body_len,stdout); - } - - } - - while(!eos){ - long i; - long bytes=fread(readbuffer,1,READ*4,stdin); /* stereo hardwired here */ - - if(bytes==0){ - /* end of file. this can be done implicitly in the mainline, - but it's easier to see here in non-clever fashion. - Tell the library we're at end of stream so that it can handle - the last frame and mark end of stream in the output properly */ - vorbis_analysis_wrote(&vd,0); - - }else{ - /* data to encode */ - - /* expose the buffer to submit data */ - float **buffer=vorbis_analysis_buffer(&vd,READ); - - /* uninterleave samples */ - for(i=0;i<bytes/4;i++){ - buffer[0][i]=((readbuffer[i*4+1]<<8)| - (0x00ff&(int)readbuffer[i*4]))/32768.f; - buffer[1][i]=((readbuffer[i*4+3]<<8)| - (0x00ff&(int)readbuffer[i*4+2]))/32768.f; - } - - /* tell the library how much we actually submitted */ - vorbis_analysis_wrote(&vd,i); - } - - /* vorbis does some data preanalysis, then divvies up blocks for - more involved (potentially parallel) processing. Get a single - block for encoding now */ - while(vorbis_analysis_blockout(&vd,&vb)==1){ - - /* analysis, assume we want to use bitrate management */ - vorbis_analysis(&vb,NULL); - vorbis_bitrate_addblock(&vb); - - while(vorbis_bitrate_flushpacket(&vd,&op)){ - - /* weld the packet into the bitstream */ - ogg_stream_packetin(&os,&op); - - /* write out pages (if any) */ - while(!eos){ - int result=ogg_stream_pageout(&os,&og); - if(result==0)break; - fwrite(og.header,1,og.header_len,stdout); - fwrite(og.body,1,og.body_len,stdout); - - /* this could be set above, but for illustrative purposes, I do - it here (to show that vorbis does know where the stream ends) */ - - if(ogg_page_eos(&og))eos=1; - } - } - } - } - - /* clean up and exit. vorbis_info_clear() must be called last */ - - ogg_stream_clear(&os); - vorbis_block_clear(&vb); - vorbis_dsp_clear(&vd); - vorbis_comment_clear(&vc); - vorbis_info_clear(&vi); - - /* ogg_page and ogg_packet structs always point to storage in - libvorbis. They're never freed or manipulated directly */ - - fprintf(stderr,"Done.\n"); - return(0); -} |