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 1.26 2001/09/17 01:33:07 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 */
27 #include <vorbis/vorbisenc.h>
29 #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
34 #if defined(macintosh) && defined(__MWERKS__)
35 #include <console.h> /* CodeWarrior's Mac "command-line" support */
39 signed char readbuffer[READ*4+44]; /* out of the data segment, not the stack */
42 ogg_stream_state os; /* take physical pages, weld into a logical
44 ogg_page og; /* one Ogg bitstream page. Vorbis packets are inside */
45 ogg_packet op; /* one raw packet of data for decode */
47 vorbis_info vi; /* struct that stores all the static vorbis bitstream
49 vorbis_comment vc; /* struct that stores all the user comments */
51 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
52 vorbis_block vb; /* local working space for packet->PCM decode */
57 #if defined(macintosh) && defined(__MWERKS__)
60 argc = ccommand(&argv); /* get a "command line" from the Mac user */
61 /* this also lets the user set stdin and stdout */
64 /* we cheat on the WAV header; we just bypass 44 bytes and never
65 verify that it matches 16bit/stereo/44.1kHz. This is just an
66 example, after all. */
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 /* we cheat on the WAV header; we just bypass the header and never
76 verify that it matches 16bit/stereo/44.1kHz. This is just an
77 example, after all. */
80 for (i=0, founddata=0; i<40 && ! feof(stdin) && ! ferror(stdin); i++)
82 fread(readbuffer,1,2,stdin);
84 if ( ! strncmp(readbuffer, "da", 2) )
87 fread(readbuffer,1,6,stdin);
91 if ( feof(stdin) || ferror(stdin) )
93 (void)fprintf(stderr, "Error: Input WAV too short, or corrupt.\n");
99 (void)fprintf(stderr, "Error: Can't find \"data\" chunk in WAV input.\n");
103 /********** Encode setup ************/
105 /* choose an encoding mode */
106 /* (mode 0: 44kHz stereo uncoupled, roughly 128kbps VBR) */
107 vorbis_info_init(&vi);
108 vorbis_encode_init(&vi,2,44100, -1, 128000, -1);
111 vorbis_comment_init(&vc);
112 vorbis_comment_add(&vc,"Track encoded by encoder_example.c");
114 /* set up the analysis state and auxiliary encoding storage */
115 vorbis_analysis_init(&vd,&vi);
116 vorbis_block_init(&vd,&vb);
118 /* set up our packet->stream encoder */
119 /* pick a random serial number; that way we can more likely build
120 chained streams just by concatenation */
122 ogg_stream_init(&os,rand());
124 /* Vorbis streams begin with three headers; the initial header (with
125 most of the codec setup parameters) which is mandated by the Ogg
126 bitstream spec. The second header holds any comment fields. The
127 third header holds the bitstream codebook. We merely need to
128 make the headers, then pass them to libvorbis one at a time;
129 libvorbis handles the additional Ogg bitstream constraints */
133 ogg_packet header_comm;
134 ogg_packet header_code;
136 vorbis_analysis_headerout(&vd,&vc,&header,&header_comm,&header_code);
137 ogg_stream_packetin(&os,&header); /* automatically placed in its own
139 ogg_stream_packetin(&os,&header_comm);
140 ogg_stream_packetin(&os,&header_code);
142 /* We don't have to write out here, but doing so makes streaming
143 * much easier, so we do, flushing ALL pages. This ensures the actual
144 * audio data will start on a new page
147 int result=ogg_stream_flush(&os,&og);
149 fwrite(og.header,1,og.header_len,stdout);
150 fwrite(og.body,1,og.body_len,stdout);
157 long bytes=fread(readbuffer,1,READ*4,stdin); /* stereo hardwired here */
160 /* end of file. this can be done implicitly in the mainline,
161 but it's easier to see here in non-clever fashion.
162 Tell the library we're at end of stream so that it can handle
163 the last frame and mark end of stream in the output properly */
164 vorbis_analysis_wrote(&vd,0);
169 /* expose the buffer to submit data */
170 float **buffer=vorbis_analysis_buffer(&vd,READ);
172 /* uninterleave samples */
173 for(i=0;i<bytes/4;i++){
174 buffer[0][i]=((readbuffer[i*4+1]<<8)|
175 (0x00ff&(int)readbuffer[i*4]))/32768.f;
176 buffer[1][i]=((readbuffer[i*4+3]<<8)|
177 (0x00ff&(int)readbuffer[i*4+2]))/32768.f;
180 /* tell the library how much we actually submitted */
181 vorbis_analysis_wrote(&vd,i);
184 /* vorbis does some data preanalysis, then divvies up blocks for
185 more involved (potentially parallel) processing. Get a single
186 block for encoding now */
187 while(vorbis_analysis_blockout(&vd,&vb)==1){
190 vorbis_analysis(&vb,&op);
192 /* weld the packet into the bitstream */
193 ogg_stream_packetin(&os,&op);
195 /* write out pages (if any) */
197 int result=ogg_stream_pageout(&os,&og);
199 fwrite(og.header,1,og.header_len,stdout);
200 fwrite(og.body,1,og.body_len,stdout);
202 /* this could be set above, but for illustrative purposes, I do
203 it here (to show that vorbis does know where the stream ends) */
205 if(ogg_page_eos(&og))eos=1;
211 /* clean up and exit. vorbis_info_clear() must be called last */
213 ogg_stream_clear(&os);
214 vorbis_block_clear(&vb);
215 vorbis_dsp_clear(&vd);
216 vorbis_comment_clear(&vc);
217 vorbis_info_clear(&vi);
219 /* ogg_page and ogg_packet structs always point to storage in
220 libvorbis. They're never freed or manipulated directly */
222 fprintf(stderr,"Done.\n");