100l (forgoten seeking functions)
[libav.git] / libavformat / wav.c
1 /*
2 * WAV encoder and decoder
3 * Copyright (c) 2001, 2002 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20 #include "avi.h"
21
22 const CodecTag codec_wav_tags[] = {
23 { CODEC_ID_MP2, 0x50 },
24 { CODEC_ID_MP3, 0x55 },
25 { CODEC_ID_AC3, 0x2000 },
26 { CODEC_ID_PCM_S16LE, 0x01 },
27 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
28 { CODEC_ID_PCM_ALAW, 0x06 },
29 { CODEC_ID_PCM_MULAW, 0x07 },
30 { CODEC_ID_ADPCM_MS, 0x02 },
31 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
32 { CODEC_ID_ADPCM_G726, 0x45 },
33 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
34 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
35 { CODEC_ID_WMAV1, 0x160 },
36 { CODEC_ID_WMAV2, 0x161 },
37 { CODEC_ID_AAC, 0x706d },
38 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
39 { CODEC_ID_SONIC, 0x2048 },
40 { CODEC_ID_SONIC_LS, 0x2048 },
41 { 0, 0 },
42 };
43
44 #ifdef CONFIG_ENCODERS
45 /* WAVEFORMATEX header */
46 /* returns the size or -1 on error */
47 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
48 {
49 int bps, blkalign, bytespersec;
50 int hdrsize = 18;
51
52 if(!enc->codec_tag)
53 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
54 if(!enc->codec_tag)
55 return -1;
56
57 put_le16(pb, enc->codec_tag);
58 put_le16(pb, enc->channels);
59 put_le32(pb, enc->sample_rate);
60 if (enc->codec_id == CODEC_ID_PCM_U8 ||
61 enc->codec_id == CODEC_ID_PCM_ALAW ||
62 enc->codec_id == CODEC_ID_PCM_MULAW) {
63 bps = 8;
64 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
65 bps = 0;
66 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
67 bps = 4;
68 } else {
69 bps = 16;
70 }
71
72 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
73 blkalign = 1;
74 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
75 } else if (enc->block_align != 0) { /* specified by the codec */
76 blkalign = enc->block_align;
77 } else
78 blkalign = enc->channels*bps >> 3;
79 if (enc->codec_id == CODEC_ID_PCM_U8 ||
80 enc->codec_id == CODEC_ID_PCM_S16LE) {
81 bytespersec = enc->sample_rate * blkalign;
82 } else {
83 bytespersec = enc->bit_rate / 8;
84 }
85 put_le32(pb, bytespersec); /* bytes per second */
86 put_le16(pb, blkalign); /* block align */
87 put_le16(pb, bps); /* bits per sample */
88 if (enc->codec_id == CODEC_ID_MP3) {
89 put_le16(pb, 12); /* wav_extra_size */
90 hdrsize += 12;
91 put_le16(pb, 1); /* wID */
92 put_le32(pb, 2); /* fdwFlags */
93 put_le16(pb, 1152); /* nBlockSize */
94 put_le16(pb, 1); /* nFramesPerBlock */
95 put_le16(pb, 1393); /* nCodecDelay */
96 } else if (enc->codec_id == CODEC_ID_MP2) {
97 put_le16(pb, 22); /* wav_extra_size */
98 hdrsize += 22;
99 put_le16(pb, 2); /* fwHeadLayer */
100 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
101 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
102 put_le16(pb, 0); /* fwHeadModeExt */
103 put_le16(pb, 1); /* wHeadEmphasis */
104 put_le16(pb, 16); /* fwHeadFlags */
105 put_le32(pb, 0); /* dwPTSLow */
106 put_le32(pb, 0); /* dwPTSHigh */
107 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
108 put_le16(pb, 2); /* wav_extra_size */
109 hdrsize += 2;
110 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
111 } else if(enc->extradata_size){
112 put_le16(pb, enc->extradata_size);
113 put_buffer(pb, enc->extradata, enc->extradata_size);
114 hdrsize += enc->extradata_size;
115 if(hdrsize&1){
116 hdrsize++;
117 put_byte(pb, 0);
118 }
119 } else {
120 hdrsize -= 2;
121 }
122
123 return hdrsize;
124 }
125 #endif //CONFIG_ENCODERS
126
127 /* We could be given one of the three possible structures here:
128 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
129 * is an expansion of the previous one with the fields added
130 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
131 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
132 * an openended structure.
133 */
134 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
135 {
136 int id;
137
138 id = get_le16(pb);
139 codec->codec_type = CODEC_TYPE_AUDIO;
140 codec->codec_tag = id;
141 codec->channels = get_le16(pb);
142 codec->sample_rate = get_le32(pb);
143 codec->bit_rate = get_le32(pb) * 8;
144 codec->block_align = get_le16(pb);
145 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
146 codec->bits_per_sample = 8;
147 }else
148 codec->bits_per_sample = get_le16(pb);
149 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
150
151 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
152 codec->extradata_size = get_le16(pb);
153 if (codec->extradata_size > 0) {
154 if (codec->extradata_size > size - 18)
155 codec->extradata_size = size - 18;
156 codec->extradata = av_mallocz(codec->extradata_size);
157 get_buffer(pb, codec->extradata, codec->extradata_size);
158 } else
159 codec->extradata_size = 0;
160
161 /* It is possible for the chunk to contain garbage at the end */
162 if (size - codec->extradata_size - 18 > 0)
163 url_fskip(pb, size - codec->extradata_size - 18);
164 }
165 }
166
167
168 int wav_codec_get_id(unsigned int tag, int bps)
169 {
170 int id;
171 id = codec_get_id(codec_wav_tags, tag);
172 if (id <= 0)
173 return id;
174 /* handle specific u8 codec */
175 if (id == CODEC_ID_PCM_S16LE && bps == 8)
176 id = CODEC_ID_PCM_U8;
177 return id;
178 }
179
180 #ifdef CONFIG_ENCODERS
181 typedef struct {
182 offset_t data;
183 } WAVContext;
184
185 static int wav_write_header(AVFormatContext *s)
186 {
187 WAVContext *wav = s->priv_data;
188 ByteIOContext *pb = &s->pb;
189 offset_t fmt;
190
191 put_tag(pb, "RIFF");
192 put_le32(pb, 0); /* file length */
193 put_tag(pb, "WAVE");
194
195 /* format header */
196 fmt = start_tag(pb, "fmt ");
197 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
198 av_free(wav);
199 return -1;
200 }
201 end_tag(pb, fmt);
202
203 /* data header */
204 wav->data = start_tag(pb, "data");
205
206 put_flush_packet(pb);
207
208 return 0;
209 }
210
211 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
212 {
213 ByteIOContext *pb = &s->pb;
214 put_buffer(pb, pkt->data, pkt->size);
215 return 0;
216 }
217
218 static int wav_write_trailer(AVFormatContext *s)
219 {
220 ByteIOContext *pb = &s->pb;
221 WAVContext *wav = s->priv_data;
222 offset_t file_size;
223
224 if (!url_is_streamed(&s->pb)) {
225 end_tag(pb, wav->data);
226
227 /* update file size */
228 file_size = url_ftell(pb);
229 url_fseek(pb, 4, SEEK_SET);
230 put_le32(pb, (uint32_t)(file_size - 8));
231 url_fseek(pb, file_size, SEEK_SET);
232
233 put_flush_packet(pb);
234 }
235 return 0;
236 }
237 #endif //CONFIG_ENCODERS
238
239 /* return the size of the found tag */
240 /* XXX: > 2GB ? */
241 static int find_tag(ByteIOContext *pb, uint32_t tag1)
242 {
243 unsigned int tag;
244 int size;
245
246 for(;;) {
247 if (url_feof(pb))
248 return -1;
249 tag = get_le32(pb);
250 size = get_le32(pb);
251 if (tag == tag1)
252 break;
253 url_fseek(pb, size, SEEK_CUR);
254 }
255 if (size < 0)
256 size = 0x7fffffff;
257 return size;
258 }
259
260 static int wav_probe(AVProbeData *p)
261 {
262 /* check file header */
263 if (p->buf_size <= 32)
264 return 0;
265 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
266 p->buf[2] == 'F' && p->buf[3] == 'F' &&
267 p->buf[8] == 'W' && p->buf[9] == 'A' &&
268 p->buf[10] == 'V' && p->buf[11] == 'E')
269 return AVPROBE_SCORE_MAX;
270 else
271 return 0;
272 }
273
274 /* wav input */
275 static int wav_read_header(AVFormatContext *s,
276 AVFormatParameters *ap)
277 {
278 int size;
279 unsigned int tag;
280 ByteIOContext *pb = &s->pb;
281 AVStream *st;
282
283 /* check RIFF header */
284 tag = get_le32(pb);
285
286 if (tag != MKTAG('R', 'I', 'F', 'F'))
287 return -1;
288 get_le32(pb); /* file size */
289 tag = get_le32(pb);
290 if (tag != MKTAG('W', 'A', 'V', 'E'))
291 return -1;
292
293 /* parse fmt header */
294 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
295 if (size < 0)
296 return -1;
297 st = av_new_stream(s, 0);
298 if (!st)
299 return AVERROR_NOMEM;
300
301 get_wav_header(pb, &st->codec, size);
302 st->need_parsing = 1;
303
304 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
305 if (size < 0)
306 return -1;
307 return 0;
308 }
309
310 #define MAX_SIZE 4096
311
312 static int wav_read_packet(AVFormatContext *s,
313 AVPacket *pkt)
314 {
315 int ret, size;
316 AVStream *st;
317
318 if (url_feof(&s->pb))
319 return AVERROR_IO;
320 st = s->streams[0];
321
322 size = MAX_SIZE;
323 if (st->codec.block_align > 1) {
324 if (size < st->codec.block_align)
325 size = st->codec.block_align;
326 size = (size / st->codec.block_align) * st->codec.block_align;
327 }
328 if (av_new_packet(pkt, size))
329 return AVERROR_IO;
330 pkt->stream_index = 0;
331
332 ret = get_buffer(&s->pb, pkt->data, pkt->size);
333 if (ret < 0)
334 av_free_packet(pkt);
335 /* note: we need to modify the packet size here to handle the last
336 packet */
337 pkt->size = ret;
338 return ret;
339 }
340
341 static int wav_read_close(AVFormatContext *s)
342 {
343 return 0;
344 }
345
346 static int wav_read_seek(AVFormatContext *s,
347 int stream_index, int64_t timestamp, int flags)
348 {
349 AVStream *st;
350
351 st = s->streams[0];
352 switch(st->codec.codec_id) {
353 case CODEC_ID_MP2:
354 case CODEC_ID_MP3:
355 case CODEC_ID_AC3:
356 case CODEC_ID_DTS:
357 /* use generic seeking with dynamically generated indexes */
358 return -1;
359 default:
360 break;
361 }
362 return pcm_read_seek(s, stream_index, timestamp, flags);
363 }
364
365
366 static AVInputFormat wav_iformat = {
367 "wav",
368 "wav format",
369 0,
370 wav_probe,
371 wav_read_header,
372 wav_read_packet,
373 wav_read_close,
374 wav_read_seek,
375 };
376
377 #ifdef CONFIG_ENCODERS
378 static AVOutputFormat wav_oformat = {
379 "wav",
380 "wav format",
381 "audio/x-wav",
382 "wav",
383 sizeof(WAVContext),
384 CODEC_ID_PCM_S16LE,
385 CODEC_ID_NONE,
386 wav_write_header,
387 wav_write_packet,
388 wav_write_trailer,
389 };
390 #endif //CONFIG_ENCODERS
391
392 int ff_wav_init(void)
393 {
394 av_register_input_format(&wav_iformat);
395 #ifdef CONFIG_ENCODERS
396 av_register_output_format(&wav_oformat);
397 #endif //CONFIG_ENCODERS
398 return 0;
399 }