fixing thread safety, this may cause alignment problms (if it does than the stuff...
[libav.git] / libavformat / wav.c
CommitLineData
de6d9b64
FB
1/*
2 * WAV encoder and decoder
e095026a 3 * Copyright (c) 2001, 2002 Fabrice Bellard.
de6d9b64 4 *
19720f15
FB
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.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
FB
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
19720f15
FB
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
de6d9b64 18 */
de6d9b64
FB
19#include "avformat.h"
20#include "avi.h"
21
e8c00089 22const CodecTag codec_wav_tags[] = {
46a3d068 23 { CODEC_ID_MP2, 0x50 },
4b1f4f23 24 { CODEC_ID_MP3LAME, 0x55 },
46a3d068
FB
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 },
0147f198
FR
30 { CODEC_ID_ADPCM_MS, 0x02 },
31 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
e095026a
FB
32 { CODEC_ID_WMAV1, 0x160 },
33 { CODEC_ID_WMAV2, 0x161 },
46a3d068
FB
34 { 0, 0 },
35};
36
37/* WAVEFORMATEX header */
afc25d93 38/* returns the size or -1 on error */
46a3d068
FB
39int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
40{
86bec9a1 41 int tag, bps, blkalign, bytespersec;
afc25d93 42 int hdrsize = 18;
46a3d068
FB
43
44 tag = codec_get_tag(codec_wav_tags, enc->codec_id);
45 if (tag == 0)
46 return -1;
4b1f4f23 47 put_le16(pb, tag);
46a3d068
FB
48 put_le16(pb, enc->channels);
49 put_le32(pb, enc->sample_rate);
46a3d068
FB
50 if (enc->codec_id == CODEC_ID_PCM_U8 ||
51 enc->codec_id == CODEC_ID_PCM_ALAW ||
52 enc->codec_id == CODEC_ID_PCM_MULAW) {
53 bps = 8;
5798368b 54 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 55 bps = 0;
889c5224
FR
56 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
57 bps = 4;
46a3d068
FB
58 } else {
59 bps = 16;
60 }
46a3d068 61
4b1f4f23 62 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 63 blkalign = 1;
4b1f4f23 64 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
0147f198
FR
65 } else if (enc->block_align != 0) { /* specified by the codec */
66 blkalign = enc->block_align;
4b1f4f23 67 } else
86bec9a1
J
68 blkalign = enc->channels*bps >> 3;
69 if (enc->codec_id == CODEC_ID_PCM_U8 ||
70 enc->codec_id == CODEC_ID_PCM_S16LE) {
71 bytespersec = enc->sample_rate * blkalign;
72 } else {
73 bytespersec = enc->bit_rate / 8;
74 }
75 put_le32(pb, bytespersec); /* bytes per second */
76 put_le16(pb, blkalign); /* block align */
77 put_le16(pb, bps); /* bits per sample */
4b1f4f23 78 if (enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 79 put_le16(pb, 12); /* wav_extra_size */
afc25d93 80 hdrsize += 12;
86bec9a1
J
81 put_le16(pb, 1); /* wID */
82 put_le32(pb, 2); /* fdwFlags */
83 put_le16(pb, 1152); /* nBlockSize */
84 put_le16(pb, 1); /* nFramesPerBlock */
85 put_le16(pb, 1393); /* nCodecDelay */
4b1f4f23
J
86 } else if (enc->codec_id == CODEC_ID_MP2) {
87 put_le16(pb, 22); /* wav_extra_size */
afc25d93 88 hdrsize += 22;
4b1f4f23
J
89 put_le16(pb, 2); /* fwHeadLayer */
90 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
91 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
92 put_le16(pb, 0); /* fwHeadModeExt */
93 put_le16(pb, 1); /* wHeadEmphasis */
94 put_le16(pb, 16); /* fwHeadFlags */
95 put_le32(pb, 0); /* dwPTSLow */
96 put_le32(pb, 0); /* dwPTSHigh */
889c5224
FR
97 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
98 put_le16(pb, 2); /* wav_extra_size */
99 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
86bec9a1
J
100 } else
101 put_le16(pb, 0); /* wav_extra_size */
102
afc25d93 103 return hdrsize;
46a3d068
FB
104}
105
2e7973bb
RS
106/* We could be given one of the three possible structures here:
107 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
108 * is an expansion of the previous one with the fields added
109 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
110 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
111 * an openended structure.
112 */
113void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
e095026a 114{
e8c00089 115 int id;
e095026a
FB
116
117 id = get_le16(pb);
118 codec->codec_type = CODEC_TYPE_AUDIO;
119 codec->codec_tag = id;
e095026a
FB
120 codec->channels = get_le16(pb);
121 codec->sample_rate = get_le32(pb);
122 codec->bit_rate = get_le32(pb) * 8;
123 codec->block_align = get_le16(pb);
2e7973bb
RS
124 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
125 codec->bits_per_sample = 8;
e0ece99a
MN
126 }else
127 codec->bits_per_sample = get_le16(pb);
128 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
129
2e7973bb 130 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
cb146faf
ZK
131 codec->extradata_size = get_le16(pb);
132 if (codec->extradata_size > 0) {
2e7973bb
RS
133 if (codec->extradata_size > size - 18)
134 codec->extradata_size = size - 18;
cb146faf
ZK
135 codec->extradata = av_mallocz(codec->extradata_size);
136 get_buffer(pb, codec->extradata, codec->extradata_size);
2e7973bb
RS
137 } else
138 codec->extradata_size = 0;
139
140 /* It is possible for the chunk to contain garbage at the end */
141 if (size - codec->extradata_size - 18 > 0)
142 url_fskip(pb, size - codec->extradata_size - 18);
e095026a
FB
143 }
144}
145
146
46a3d068
FB
147int wav_codec_get_id(unsigned int tag, int bps)
148{
149 int id;
150 id = codec_get_id(codec_wav_tags, tag);
151 if (id <= 0)
152 return id;
153 /* handle specific u8 codec */
154 if (id == CODEC_ID_PCM_S16LE && bps == 8)
155 id = CODEC_ID_PCM_U8;
156 return id;
157}
158
de6d9b64
FB
159typedef struct {
160 offset_t data;
161} WAVContext;
162
163static int wav_write_header(AVFormatContext *s)
164{
c9a65ca8 165 WAVContext *wav = s->priv_data;
de6d9b64
FB
166 ByteIOContext *pb = &s->pb;
167 offset_t fmt;
168
de6d9b64
FB
169 put_tag(pb, "RIFF");
170 put_le32(pb, 0); /* file length */
171 put_tag(pb, "WAVE");
172
173 /* format header */
174 fmt = start_tag(pb, "fmt ");
46a3d068 175 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
1ea4f593 176 av_free(wav);
46a3d068
FB
177 return -1;
178 }
de6d9b64
FB
179 end_tag(pb, fmt);
180
181 /* data header */
182 wav->data = start_tag(pb, "data");
183
184 put_flush_packet(pb);
185
186 return 0;
187}
188
189static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
0c1a9eda 190 uint8_t *buf, int size, int force_pts)
de6d9b64
FB
191{
192 ByteIOContext *pb = &s->pb;
193 put_buffer(pb, buf, size);
194 return 0;
195}
196
197static int wav_write_trailer(AVFormatContext *s)
198{
199 ByteIOContext *pb = &s->pb;
200 WAVContext *wav = s->priv_data;
201 offset_t file_size;
202
203 if (!url_is_streamed(&s->pb)) {
204 end_tag(pb, wav->data);
205
206 /* update file size */
207 file_size = url_ftell(pb);
208 url_fseek(pb, 4, SEEK_SET);
0c1a9eda 209 put_le32(pb, (uint32_t)(file_size - 8));
de6d9b64
FB
210 url_fseek(pb, file_size, SEEK_SET);
211
212 put_flush_packet(pb);
213 }
de6d9b64
FB
214 return 0;
215}
216
217/* return the size of the found tag */
218/* XXX: > 2GB ? */
0c1a9eda 219static int find_tag(ByteIOContext *pb, uint32_t tag1)
de6d9b64
FB
220{
221 unsigned int tag;
222 int size;
223
224 for(;;) {
225 if (url_feof(pb))
226 return -1;
227 tag = get_le32(pb);
228 size = get_le32(pb);
229 if (tag == tag1)
230 break;
231 url_fseek(pb, size, SEEK_CUR);
232 }
233 if (size < 0)
234 size = 0x7fffffff;
235 return size;
236}
237
c9a65ca8
FB
238static int wav_probe(AVProbeData *p)
239{
240 /* check file header */
241 if (p->buf_size <= 32)
242 return 0;
243 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
244 p->buf[2] == 'F' && p->buf[3] == 'F' &&
245 p->buf[8] == 'W' && p->buf[9] == 'A' &&
246 p->buf[10] == 'V' && p->buf[11] == 'E')
247 return AVPROBE_SCORE_MAX;
248 else
249 return 0;
250}
251
de6d9b64
FB
252/* wav input */
253static int wav_read_header(AVFormatContext *s,
254 AVFormatParameters *ap)
255{
256 int size;
257 unsigned int tag;
258 ByteIOContext *pb = &s->pb;
de6d9b64
FB
259 AVStream *st;
260
261 /* check RIFF header */
262 tag = get_le32(pb);
263
264 if (tag != MKTAG('R', 'I', 'F', 'F'))
265 return -1;
266 get_le32(pb); /* file size */
267 tag = get_le32(pb);
268 if (tag != MKTAG('W', 'A', 'V', 'E'))
269 return -1;
270
271 /* parse fmt header */
272 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
273 if (size < 0)
274 return -1;
c9a65ca8 275 st = av_new_stream(s, 0);
de6d9b64 276 if (!st)
c9a65ca8 277 return AVERROR_NOMEM;
de6d9b64 278
2e7973bb 279 get_wav_header(pb, &st->codec, size);
e095026a
FB
280
281 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
282 if (size < 0)
283 return -1;
de6d9b64
FB
284 return 0;
285}
286
287#define MAX_SIZE 4096
288
289static int wav_read_packet(AVFormatContext *s,
290 AVPacket *pkt)
291{
94ef6864 292 int ret;
de6d9b64
FB
293
294 if (url_feof(&s->pb))
295 return -EIO;
94ef6864 296 if (av_new_packet(pkt, MAX_SIZE))
de6d9b64
FB
297 return -EIO;
298 pkt->stream_index = 0;
299
300 ret = get_buffer(&s->pb, pkt->data, pkt->size);
301 if (ret < 0)
302 av_free_packet(pkt);
5ed8fafc
FB
303 /* note: we need to modify the packet size here to handle the last
304 packet */
305 pkt->size = ret;
de6d9b64
FB
306 return ret;
307}
308
309static int wav_read_close(AVFormatContext *s)
310{
311 return 0;
312}
313
c9a65ca8
FB
314static AVInputFormat wav_iformat = {
315 "wav",
316 "wav format",
317 0,
318 wav_probe,
319 wav_read_header,
320 wav_read_packet,
321 wav_read_close,
322};
323
324static AVOutputFormat wav_oformat = {
de6d9b64
FB
325 "wav",
326 "wav format",
327 "audio/x-wav",
328 "wav",
c9a65ca8 329 sizeof(WAVContext),
5ed8fafc 330 CODEC_ID_PCM_S16LE,
de6d9b64
FB
331 CODEC_ID_NONE,
332 wav_write_header,
333 wav_write_packet,
334 wav_write_trailer,
de6d9b64 335};
c9a65ca8
FB
336
337int wav_init(void)
338{
339 av_register_input_format(&wav_iformat);
340 av_register_output_format(&wav_oformat);
341 return 0;
342}