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 1.24 2001/09/15 04:47:48 cwolf 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 */
42 int main(int argc, char *argv[]){
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 */
61 #if defined(macintosh) && defined(__MWERKS__)
64 ac = ccommand(&av); /* get a "command line" from the Mac user */
65 /* this also lets the user set stdin and stdout */
68 #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
69 /* Beware the evil ifdef. We avoid these where we can, but this one we
70 cannot. Don't add any more, you'll probably go to hell if you do. */
71 _setmode( _fileno( stdin ), _O_BINARY );
72 _setmode( _fileno( stdout ), _O_BINARY );
75 /* If command line args were supplied, open the named file(s)
76 for i/o, else maintain use of stdin/stdout.*/
79 if ((fpin = fopen(argv[1], "rb")) == (FILE*)NULL)
81 (void)sprintf(msg, "Can't open %s for reading.", argv[1]);
86 if ((fpout = fopen(argv[2], "wb")) == (FILE*)NULL)
88 (void)sprintf(msg, "Can't open %s for writing.", argv[2]);
99 /* we cheat on the WAV header; we just bypass the header and never
100 verify that it matches 16bit/stereo/44.1kHz. This is just an
101 example, after all. */
103 readbuffer[0] = '\0';
104 for (i=0, founddata=0; i<40 && ! feof(fpin) && ! ferror(fpin); i++)
106 fread(readbuffer,1,2,fpin);
108 if ( ! strncmp(readbuffer, "da", 2) )
111 fread(readbuffer,1,6,fpin);
115 if ( feof(fpin) || ferror(fpin) )
117 (void)fprintf(stderr, "Error: Input WAV too short, or corrupt.\n");
123 (void)fprintf(stderr, "Error: Can't find \"data\" chunk in WAV input.\n");
127 /********** Encode setup ************/
129 /* choose an encoding mode */
130 /* (mode 0: 44kHz stereo uncoupled, roughly 128kbps VBR) */
131 vorbis_info_init(&vi);
132 vorbis_encode_init(&vi,2,44100, -1, 128000, -1);
135 vorbis_comment_init(&vc);
136 vorbis_comment_add(&vc,"Track encoded by encoder_example.c");
138 /* set up the analysis state and auxiliary encoding storage */
139 vorbis_analysis_init(&vd,&vi);
140 vorbis_block_init(&vd,&vb);
142 /* set up our packet->stream encoder */
143 /* pick a random serial number; that way we can more likely build
144 chained streams just by concatenation */
146 ogg_stream_init(&os,rand());
148 /* Vorbis streams begin with three headers; the initial header (with
149 most of the codec setup parameters) which is mandated by the Ogg
150 bitstream spec. The second header holds any comment fields. The
151 third header holds the bitstream codebook. We merely need to
152 make the headers, then pass them to libvorbis one at a time;
153 libvorbis handles the additional Ogg bitstream constraints */
157 ogg_packet header_comm;
158 ogg_packet header_code;
160 vorbis_analysis_headerout(&vd,&vc,&header,&header_comm,&header_code);
161 ogg_stream_packetin(&os,&header); /* automatically placed in its own
163 ogg_stream_packetin(&os,&header_comm);
164 ogg_stream_packetin(&os,&header_code);
166 /* We don't have to write out here, but doing so makes streaming
167 * much easier, so we do, flushing ALL pages. This ensures the actual
168 * audio data will start on a new page
171 int result=ogg_stream_flush(&os,&og);
173 fwrite(og.header,1,og.header_len,fpout);
174 fwrite(og.body,1,og.body_len,fpout);
181 long bytes=fread(readbuffer,1,READ*4,fpin); /* stereo hardwired here */
184 /* end of file. this can be done implicitly in the mainline,
185 but it's easier to see here in non-clever fashion.
186 Tell the library we're at end of stream so that it can handle
187 the last frame and mark end of stream in the output properly */
188 vorbis_analysis_wrote(&vd,0);
193 /* expose the buffer to submit data */
194 float **buffer=vorbis_analysis_buffer(&vd,READ);
196 /* uninterleave samples */
197 for(i=0;i<bytes/4;i++){
198 buffer[0][i]=((readbuffer[i*4+1]<<8)|
199 (0x00ff&(int)readbuffer[i*4]))/32768.f;
200 buffer[1][i]=((readbuffer[i*4+3]<<8)|
201 (0x00ff&(int)readbuffer[i*4+2]))/32768.f;
204 /* tell the library how much we actually submitted */
205 vorbis_analysis_wrote(&vd,i);
208 /* vorbis does some data preanalysis, then divvies up blocks for
209 more involved (potentially parallel) processing. Get a single
210 block for encoding now */
211 while(vorbis_analysis_blockout(&vd,&vb)==1){
214 vorbis_analysis(&vb,&op);
216 /* weld the packet into the bitstream */
217 ogg_stream_packetin(&os,&op);
219 /* write out pages (if any) */
221 int result=ogg_stream_pageout(&os,&og);
223 fwrite(og.header,1,og.header_len,fpout);
224 fwrite(og.body,1,og.body_len,fpout);
226 /* this could be set above, but for illustrative purposes, I do
227 it here (to show that vorbis does know where the stream ends) */
229 if(ogg_page_eos(&og))eos=1;
235 /* clean up and exit. vorbis_info_clear() must be called last */
237 ogg_stream_clear(&os);
238 vorbis_block_clear(&vb);
239 vorbis_dsp_clear(&vd);
240 vorbis_comment_clear(&vc);
241 vorbis_info_clear(&vi);
243 /* ogg_page and ogg_packet structs always point to storage in
244 libvorbis. They're never freed or manipulated directly */
246 fprintf(stderr,"Done.\n");