1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
11 ********************************************************************
13 function: simple example encoder
14 last mod: $Id: encoder_example.c,v 1.41 2002/06/28 22:19:34 xiphmont Exp $
16 ********************************************************************/
18 /* takes a stereo 16bit 44.1kHz WAV file from stdin and encodes it into
21 /* Note that this is POSIX, not ANSI, code */
28 #include <vorbis/vorbisenc.h>
30 #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
35 #if defined(macintosh) && defined(__MWERKS__)
36 #include <console.h> /* CodeWarrior's Mac "command-line" support */
40 signed char readbuffer[READ*4+44]; /* out of the data segment, not the stack */
43 ogg_stream_state os; /* take physical pages, weld into a logical
45 ogg_page og; /* one Ogg bitstream page. Vorbis packets are inside */
46 ogg_packet op; /* one raw packet of data for decode */
48 vorbis_info vi; /* struct that stores all the static vorbis bitstream
50 vorbis_comment vc; /* struct that stores all the user comments */
52 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
53 vorbis_block vb; /* local working space for packet->PCM decode */
58 #if defined(macintosh) && defined(__MWERKS__)
61 argc = ccommand(&argv); /* get a "command line" from the Mac user */
62 /* this also lets the user set stdin and stdout */
65 /* we cheat on the WAV header; we just bypass 44 bytes and never
66 verify that it matches 16bit/stereo/44.1kHz. This is just an
67 example, after all. */
69 #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
70 /* Beware the evil ifdef. We avoid these where we can, but this one we
71 cannot. Don't add any more, you'll probably go to hell if you do. */
72 _setmode( _fileno( stdin ), _O_BINARY );
73 _setmode( _fileno( stdout ), _O_BINARY );
77 /* we cheat on the WAV header; we just bypass the header and never
78 verify that it matches 16bit/stereo/44.1kHz. This is just an
79 example, after all. */
82 for (i=0, founddata=0; i<30 && ! feof(stdin) && ! ferror(stdin); i++)
84 fread(readbuffer,1,2,stdin);
86 if ( ! strncmp(readbuffer, "da", 2) )
89 fread(readbuffer,1,6,stdin);
94 /********** Encode setup ************/
96 /* choose an encoding mode */
97 /* (quality mode .4: 44kHz stereo coupled, roughly 128kbps VBR) */
98 vorbis_info_init(&vi);
100 //vorbis_encode_init(&vi,2,44100,-1,82000,-1);
101 vorbis_encode_init_vbr(&vi,2,44100,.9);
104 vorbis_comment_init(&vc);
105 vorbis_comment_add_tag(&vc,"ENCODER","encoder_example.c");
107 /* set up the analysis state and auxiliary encoding storage */
108 vorbis_analysis_init(&vd,&vi);
109 vorbis_block_init(&vd,&vb);
111 /* set up our packet->stream encoder */
112 /* pick a random serial number; that way we can more likely build
113 chained streams just by concatenation */
115 ogg_stream_init(&os,rand());
117 /* Vorbis streams begin with three headers; the initial header (with
118 most of the codec setup parameters) which is mandated by the Ogg
119 bitstream spec. The second header holds any comment fields. The
120 third header holds the bitstream codebook. We merely need to
121 make the headers, then pass them to libvorbis one at a time;
122 libvorbis handles the additional Ogg bitstream constraints */
126 ogg_packet header_comm;
127 ogg_packet header_code;
129 vorbis_analysis_headerout(&vd,&vc,&header,&header_comm,&header_code);
130 ogg_stream_packetin(&os,&header); /* automatically placed in its own
132 ogg_stream_packetin(&os,&header_comm);
133 ogg_stream_packetin(&os,&header_code);
135 /* We don't have to write out here, but doing so makes streaming
136 * much easier, so we do, flushing ALL pages. This ensures the actual
137 * audio data will start on a new page
140 int result=ogg_stream_flush(&os,&og);
142 fwrite(og.header,1,og.header_len,stdout);
143 fwrite(og.body,1,og.body_len,stdout);
150 long bytes=fread(readbuffer,1,READ*4,stdin); /* stereo hardwired here */
153 /* end of file. this can be done implicitly in the mainline,
154 but it's easier to see here in non-clever fashion.
155 Tell the library we're at end of stream so that it can handle
156 the last frame and mark end of stream in the output properly */
157 vorbis_analysis_wrote(&vd,0);
162 /* expose the buffer to submit data */
163 float **buffer=vorbis_analysis_buffer(&vd,READ);
165 /* uninterleave samples */
166 for(i=0;i<bytes/4;i++){
167 buffer[0][i]=((readbuffer[i*4+1]<<8)|
168 (0x00ff&(int)readbuffer[i*4]))/32768.f;
169 buffer[1][i]=((readbuffer[i*4+3]<<8)|
170 (0x00ff&(int)readbuffer[i*4+2]))/32768.f;
173 /* tell the library how much we actually submitted */
174 vorbis_analysis_wrote(&vd,i);
177 /* vorbis does some data preanalysis, then divvies up blocks for
178 more involved (potentially parallel) processing. Get a single
179 block for encoding now */
180 while(vorbis_analysis_blockout(&vd,&vb)==1){
182 /* analysis, assume we want to use bitrate management */
183 vorbis_analysis(&vb,NULL);
184 vorbis_bitrate_addblock(&vb);
186 while(vorbis_bitrate_flushpacket(&vd,&op)){
188 /* weld the packet into the bitstream */
189 ogg_stream_packetin(&os,&op);
191 /* write out pages (if any) */
193 int result=ogg_stream_pageout(&os,&og);
195 fwrite(og.header,1,og.header_len,stdout);
196 fwrite(og.body,1,og.body_len,stdout);
198 /* this could be set above, but for illustrative purposes, I do
199 it here (to show that vorbis does know where the stream ends) */
201 if(ogg_page_eos(&og))eos=1;
207 /* clean up and exit. vorbis_info_clear() must be called last */
209 ogg_stream_clear(&os);
210 vorbis_block_clear(&vb);
211 vorbis_dsp_clear(&vd);
212 vorbis_comment_clear(&vc);
213 vorbis_info_clear(&vi);
215 /* ogg_page and ogg_packet structs always point to storage in
216 libvorbis. They're never freed or manipulated directly */
218 fprintf(stderr,"Done.\n");