1beb7359dad11b7560abb794800a6895581f12dc
[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 { 0, 0 },
38 };
39
40 #ifdef CONFIG_ENCODERS
41 /* WAVEFORMATEX header */
42 /* returns the size or -1 on error */
43 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
44 {
45 int bps, blkalign, bytespersec;
46 int hdrsize = 18;
47
48 if(!enc->codec_tag)
49 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
50 if(!enc->codec_tag)
51 return -1;
52
53 put_le16(pb, enc->codec_tag);
54 put_le16(pb, enc->channels);
55 put_le32(pb, enc->sample_rate);
56 if (enc->codec_id == CODEC_ID_PCM_U8 ||
57 enc->codec_id == CODEC_ID_PCM_ALAW ||
58 enc->codec_id == CODEC_ID_PCM_MULAW) {
59 bps = 8;
60 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
61 bps = 0;
62 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
63 bps = 4;
64 } else {
65 bps = 16;
66 }
67
68 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
69 blkalign = 1;
70 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
71 } else if (enc->block_align != 0) { /* specified by the codec */
72 blkalign = enc->block_align;
73 } else
74 blkalign = enc->channels*bps >> 3;
75 if (enc->codec_id == CODEC_ID_PCM_U8 ||
76 enc->codec_id == CODEC_ID_PCM_S16LE) {
77 bytespersec = enc->sample_rate * blkalign;
78 } else {
79 bytespersec = enc->bit_rate / 8;
80 }
81 put_le32(pb, bytespersec); /* bytes per second */
82 put_le16(pb, blkalign); /* block align */
83 put_le16(pb, bps); /* bits per sample */
84 if (enc->codec_id == CODEC_ID_MP3) {
85 put_le16(pb, 12); /* wav_extra_size */
86 hdrsize += 12;
87 put_le16(pb, 1); /* wID */
88 put_le32(pb, 2); /* fdwFlags */
89 put_le16(pb, 1152); /* nBlockSize */
90 put_le16(pb, 1); /* nFramesPerBlock */
91 put_le16(pb, 1393); /* nCodecDelay */
92 } else if (enc->codec_id == CODEC_ID_MP2) {
93 put_le16(pb, 22); /* wav_extra_size */
94 hdrsize += 22;
95 put_le16(pb, 2); /* fwHeadLayer */
96 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
97 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
98 put_le16(pb, 0); /* fwHeadModeExt */
99 put_le16(pb, 1); /* wHeadEmphasis */
100 put_le16(pb, 16); /* fwHeadFlags */
101 put_le32(pb, 0); /* dwPTSLow */
102 put_le32(pb, 0); /* dwPTSHigh */
103 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
104 put_le16(pb, 2); /* wav_extra_size */
105 hdrsize += 2;
106 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
107 } else
108 put_le16(pb, 0); /* wav_extra_size */
109
110 return hdrsize;
111 }
112 #endif //CONFIG_ENCODERS
113
114 /* We could be given one of the three possible structures here:
115 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
116 * is an expansion of the previous one with the fields added
117 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
118 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
119 * an openended structure.
120 */
121 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
122 {
123 int id;
124
125 id = get_le16(pb);
126 codec->codec_type = CODEC_TYPE_AUDIO;
127 codec->codec_tag = id;
128 codec->channels = get_le16(pb);
129 codec->sample_rate = get_le32(pb);
130 codec->bit_rate = get_le32(pb) * 8;
131 codec->block_align = get_le16(pb);
132 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
133 codec->bits_per_sample = 8;
134 }else
135 codec->bits_per_sample = get_le16(pb);
136 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
137
138 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
139 codec->extradata_size = get_le16(pb);
140 if (codec->extradata_size > 0) {
141 if (codec->extradata_size > size - 18)
142 codec->extradata_size = size - 18;
143 codec->extradata = av_mallocz(codec->extradata_size);
144 get_buffer(pb, codec->extradata, codec->extradata_size);
145 } else
146 codec->extradata_size = 0;
147
148 /* It is possible for the chunk to contain garbage at the end */
149 if (size - codec->extradata_size - 18 > 0)
150 url_fskip(pb, size - codec->extradata_size - 18);
151 }
152 }
153
154
155 int wav_codec_get_id(unsigned int tag, int bps)
156 {
157 int id;
158 id = codec_get_id(codec_wav_tags, tag);
159 if (id <= 0)
160 return id;
161 /* handle specific u8 codec */
162 if (id == CODEC_ID_PCM_S16LE && bps == 8)
163 id = CODEC_ID_PCM_U8;
164 return id;
165 }
166
167 #ifdef CONFIG_ENCODERS
168 typedef struct {
169 offset_t data;
170 } WAVContext;
171
172 static int wav_write_header(AVFormatContext *s)
173 {
174 WAVContext *wav = s->priv_data;
175 ByteIOContext *pb = &s->pb;
176 offset_t fmt;
177
178 put_tag(pb, "RIFF");
179 put_le32(pb, 0); /* file length */
180 put_tag(pb, "WAVE");
181
182 /* format header */
183 fmt = start_tag(pb, "fmt ");
184 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
185 av_free(wav);
186 return -1;
187 }
188 end_tag(pb, fmt);
189
190 /* data header */
191 wav->data = start_tag(pb, "data");
192
193 put_flush_packet(pb);
194
195 return 0;
196 }
197
198 static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
199 const uint8_t *buf, int size, int64_t pts)
200 {
201 ByteIOContext *pb = &s->pb;
202 put_buffer(pb, buf, size);
203 return 0;
204 }
205
206 static int wav_write_trailer(AVFormatContext *s)
207 {
208 ByteIOContext *pb = &s->pb;
209 WAVContext *wav = s->priv_data;
210 offset_t file_size;
211
212 if (!url_is_streamed(&s->pb)) {
213 end_tag(pb, wav->data);
214
215 /* update file size */
216 file_size = url_ftell(pb);
217 url_fseek(pb, 4, SEEK_SET);
218 put_le32(pb, (uint32_t)(file_size - 8));
219 url_fseek(pb, file_size, SEEK_SET);
220
221 put_flush_packet(pb);
222 }
223 return 0;
224 }
225 #endif //CONFIG_ENCODERS
226
227 /* return the size of the found tag */
228 /* XXX: > 2GB ? */
229 static int find_tag(ByteIOContext *pb, uint32_t tag1)
230 {
231 unsigned int tag;
232 int size;
233
234 for(;;) {
235 if (url_feof(pb))
236 return -1;
237 tag = get_le32(pb);
238 size = get_le32(pb);
239 if (tag == tag1)
240 break;
241 url_fseek(pb, size, SEEK_CUR);
242 }
243 if (size < 0)
244 size = 0x7fffffff;
245 return size;
246 }
247
248 static int wav_probe(AVProbeData *p)
249 {
250 /* check file header */
251 if (p->buf_size <= 32)
252 return 0;
253 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
254 p->buf[2] == 'F' && p->buf[3] == 'F' &&
255 p->buf[8] == 'W' && p->buf[9] == 'A' &&
256 p->buf[10] == 'V' && p->buf[11] == 'E')
257 return AVPROBE_SCORE_MAX;
258 else
259 return 0;
260 }
261
262 /* wav input */
263 static int wav_read_header(AVFormatContext *s,
264 AVFormatParameters *ap)
265 {
266 int size;
267 unsigned int tag;
268 ByteIOContext *pb = &s->pb;
269 AVStream *st;
270
271 /* check RIFF header */
272 tag = get_le32(pb);
273
274 if (tag != MKTAG('R', 'I', 'F', 'F'))
275 return -1;
276 get_le32(pb); /* file size */
277 tag = get_le32(pb);
278 if (tag != MKTAG('W', 'A', 'V', 'E'))
279 return -1;
280
281 /* parse fmt header */
282 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
283 if (size < 0)
284 return -1;
285 st = av_new_stream(s, 0);
286 if (!st)
287 return AVERROR_NOMEM;
288
289 get_wav_header(pb, &st->codec, size);
290 st->need_parsing = 1;
291
292 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
293 if (size < 0)
294 return -1;
295 return 0;
296 }
297
298 #define MAX_SIZE 4096
299
300 static int wav_read_packet(AVFormatContext *s,
301 AVPacket *pkt)
302 {
303 int ret, size;
304 AVStream *st;
305
306 if (url_feof(&s->pb))
307 return -EIO;
308 st = s->streams[0];
309
310 size = MAX_SIZE;
311 if (st->codec.block_align > 1) {
312 if (size < st->codec.block_align)
313 size = st->codec.block_align;
314 size = (size / st->codec.block_align) * st->codec.block_align;
315 }
316 if (av_new_packet(pkt, size))
317 return -EIO;
318 pkt->stream_index = 0;
319
320 ret = get_buffer(&s->pb, pkt->data, pkt->size);
321 if (ret < 0)
322 av_free_packet(pkt);
323 /* note: we need to modify the packet size here to handle the last
324 packet */
325 pkt->size = ret;
326 return ret;
327 }
328
329 static int wav_read_close(AVFormatContext *s)
330 {
331 return 0;
332 }
333
334 static int wav_read_seek(AVFormatContext *s,
335 int stream_index, int64_t timestamp)
336 {
337 AVStream *st;
338
339 st = s->streams[0];
340 switch(st->codec.codec_id) {
341 case CODEC_ID_MP2:
342 case CODEC_ID_MP3:
343 case CODEC_ID_AC3:
344 /* use generic seeking with dynamically generated indexes */
345 return -1;
346 default:
347 break;
348 }
349 return pcm_read_seek(s, stream_index, timestamp);
350 }
351
352
353 static AVInputFormat wav_iformat = {
354 "wav",
355 "wav format",
356 0,
357 wav_probe,
358 wav_read_header,
359 wav_read_packet,
360 wav_read_close,
361 wav_read_seek,
362 };
363
364 #ifdef CONFIG_ENCODERS
365 static AVOutputFormat wav_oformat = {
366 "wav",
367 "wav format",
368 "audio/x-wav",
369 "wav",
370 sizeof(WAVContext),
371 CODEC_ID_PCM_S16LE,
372 CODEC_ID_NONE,
373 wav_write_header,
374 wav_write_packet,
375 wav_write_trailer,
376 };
377 #endif //CONFIG_ENCODERS
378
379 int wav_init(void)
380 {
381 av_register_input_format(&wav_iformat);
382 #ifdef CONFIG_ENCODERS
383 av_register_output_format(&wav_oformat);
384 #endif //CONFIG_ENCODERS
385 return 0;
386 }