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 1.22 2001/08/13 11:33:39 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 */
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*2+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 */
56 #if defined(macintosh) && defined(__MWERKS__)
59 argc = ccommand(&argv); /* get a "command line" from the Mac user */
60 /* this also lets the user set stdin and stdout */
63 /* we cheat on the WAV header; we just bypass 44 bytes and never
64 verify that it matches 16bit/stereo/44.1kHz. This is just an
65 example, after all. */
67 #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
68 /* Beware the evil ifdef. We avoid these where we can, but this one we
69 cannot. Don't add any more, you'll probably go to hell if you do. */
70 _setmode( _fileno( stdin ), _O_BINARY );
71 _setmode( _fileno( stdout ), _O_BINARY );
75 fread(readbuffer,1,44,stdin);
77 /********** Encode setup ************/
79 /* choose an encoding mode */
80 /* (mode 0: 44kHz stereo uncoupled, roughly 128kbps VBR) */
81 vorbis_info_init(&vi);
82 vorbis_encode_init(&vi,1,44100, -1, 999000, -1);
85 vorbis_comment_init(&vc);
86 vorbis_comment_add(&vc,"Track encoded by encoder_example.c");
88 /* set up the analysis state and auxiliary encoding storage */
89 vorbis_analysis_init(&vd,&vi);
90 vorbis_block_init(&vd,&vb);
92 /* set up our packet->stream encoder */
93 /* pick a random serial number; that way we can more likely build
94 chained streams just by concatenation */
96 ogg_stream_init(&os,rand());
98 /* Vorbis streams begin with three headers; the initial header (with
99 most of the codec setup parameters) which is mandated by the Ogg
100 bitstream spec. The second header holds any comment fields. The
101 third header holds the bitstream codebook. We merely need to
102 make the headers, then pass them to libvorbis one at a time;
103 libvorbis handles the additional Ogg bitstream constraints */
107 ogg_packet header_comm;
108 ogg_packet header_code;
110 vorbis_analysis_headerout(&vd,&vc,&header,&header_comm,&header_code);
111 ogg_stream_packetin(&os,&header); /* automatically placed in its own
113 ogg_stream_packetin(&os,&header_comm);
114 ogg_stream_packetin(&os,&header_code);
116 /* We don't have to write out here, but doing so makes streaming
117 * much easier, so we do, flushing ALL pages. This ensures the actual
118 * audio data will start on a new page
121 int result=ogg_stream_flush(&os,&og);
123 fwrite(og.header,1,og.header_len,stdout);
124 fwrite(og.body,1,og.body_len,stdout);
131 long bytes=fread(readbuffer,1,READ*2,stdin); /* stereo hardwired here */
134 /* end of file. this can be done implicitly in the mainline,
135 but it's easier to see here in non-clever fashion.
136 Tell the library we're at end of stream so that it can handle
137 the last frame and mark end of stream in the output properly */
138 vorbis_analysis_wrote(&vd,0);
143 /* expose the buffer to submit data */
144 float **buffer=vorbis_analysis_buffer(&vd,READ);
146 /* uninterleave samples */
147 for(i=0;i<bytes/2;i++){
148 buffer[0][i]=((readbuffer[i*2+1]<<8)|
149 (0x00ff&(int)readbuffer[i*2]))/32768.f;
152 /* tell the library how much we actually submitted */
153 vorbis_analysis_wrote(&vd,i);
156 /* vorbis does some data preanalysis, then divvies up blocks for
157 more involved (potentially parallel) processing. Get a single
158 block for encoding now */
159 while(vorbis_analysis_blockout(&vd,&vb)==1){
162 vorbis_analysis(&vb,&op);
164 /* weld the packet into the bitstream */
165 ogg_stream_packetin(&os,&op);
167 /* write out pages (if any) */
169 int result=ogg_stream_pageout(&os,&og);
171 fwrite(og.header,1,og.header_len,stdout);
172 fwrite(og.body,1,og.body_len,stdout);
174 /* this could be set above, but for illustrative purposes, I do
175 it here (to show that vorbis does know where the stream ends) */
177 if(ogg_page_eos(&og))eos=1;
183 /* clean up and exit. vorbis_info_clear() must be called last */
185 ogg_stream_clear(&os);
186 vorbis_block_clear(&vb);
187 vorbis_dsp_clear(&vd);
188 vorbis_comment_clear(&vc);
189 vorbis_info_clear(&vi);
191 /* ogg_page and ogg_packet structs always point to storage in
192 libvorbis. They're never freed or manipulated directly */
194 fprintf(stderr,"Done.\n");