nanosleep patch by François Revol <revol at free dot fr>
[libav.git] / libav / wav.c
CommitLineData
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1/*
2 * WAV encoder and decoder
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
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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
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
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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 */
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19#include "avformat.h"
20#include "avi.h"
21
46a3d068 22CodecTag codec_wav_tags[] = {
46a3d068 23 { CODEC_ID_MP2, 0x50 },
4b1f4f23 24 { CODEC_ID_MP3LAME, 0x55 },
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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 },
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30 { CODEC_ID_ADPCM_MS, 0x02 },
31 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
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32 { 0, 0 },
33};
34
35/* WAVEFORMATEX header */
afc25d93 36/* returns the size or -1 on error */
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37int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
38{
86bec9a1 39 int tag, bps, blkalign, bytespersec;
afc25d93 40 int hdrsize = 18;
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41
42 tag = codec_get_tag(codec_wav_tags, enc->codec_id);
43 if (tag == 0)
44 return -1;
4b1f4f23 45 put_le16(pb, tag);
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46 put_le16(pb, enc->channels);
47 put_le32(pb, enc->sample_rate);
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48 if (enc->codec_id == CODEC_ID_PCM_U8 ||
49 enc->codec_id == CODEC_ID_PCM_ALAW ||
50 enc->codec_id == CODEC_ID_PCM_MULAW) {
51 bps = 8;
5798368b 52 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 53 bps = 0;
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54 } else {
55 bps = 16;
56 }
46a3d068 57
4b1f4f23 58 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 59 blkalign = 1;
4b1f4f23 60 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
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61 } else if (enc->block_align != 0) { /* specified by the codec */
62 blkalign = enc->block_align;
4b1f4f23 63 } else
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64 blkalign = enc->channels*bps >> 3;
65 if (enc->codec_id == CODEC_ID_PCM_U8 ||
66 enc->codec_id == CODEC_ID_PCM_S16LE) {
67 bytespersec = enc->sample_rate * blkalign;
68 } else {
69 bytespersec = enc->bit_rate / 8;
70 }
71 put_le32(pb, bytespersec); /* bytes per second */
72 put_le16(pb, blkalign); /* block align */
73 put_le16(pb, bps); /* bits per sample */
4b1f4f23 74 if (enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 75 put_le16(pb, 12); /* wav_extra_size */
afc25d93 76 hdrsize += 12;
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77 put_le16(pb, 1); /* wID */
78 put_le32(pb, 2); /* fdwFlags */
79 put_le16(pb, 1152); /* nBlockSize */
80 put_le16(pb, 1); /* nFramesPerBlock */
81 put_le16(pb, 1393); /* nCodecDelay */
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82 } else if (enc->codec_id == CODEC_ID_MP2) {
83 put_le16(pb, 22); /* wav_extra_size */
afc25d93 84 hdrsize += 22;
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85 put_le16(pb, 2); /* fwHeadLayer */
86 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
87 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
88 put_le16(pb, 0); /* fwHeadModeExt */
89 put_le16(pb, 1); /* wHeadEmphasis */
90 put_le16(pb, 16); /* fwHeadFlags */
91 put_le32(pb, 0); /* dwPTSLow */
92 put_le32(pb, 0); /* dwPTSHigh */
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93 } else
94 put_le16(pb, 0); /* wav_extra_size */
95
afc25d93 96 return hdrsize;
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97}
98
99int wav_codec_get_id(unsigned int tag, int bps)
100{
101 int id;
102 id = codec_get_id(codec_wav_tags, tag);
103 if (id <= 0)
104 return id;
105 /* handle specific u8 codec */
106 if (id == CODEC_ID_PCM_S16LE && bps == 8)
107 id = CODEC_ID_PCM_U8;
108 return id;
109}
110
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111typedef struct {
112 offset_t data;
113} WAVContext;
114
115static int wav_write_header(AVFormatContext *s)
116{
c9a65ca8 117 WAVContext *wav = s->priv_data;
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118 ByteIOContext *pb = &s->pb;
119 offset_t fmt;
120
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121 put_tag(pb, "RIFF");
122 put_le32(pb, 0); /* file length */
123 put_tag(pb, "WAVE");
124
125 /* format header */
126 fmt = start_tag(pb, "fmt ");
46a3d068 127 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
1ea4f593 128 av_free(wav);
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129 return -1;
130 }
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131 end_tag(pb, fmt);
132
133 /* data header */
134 wav->data = start_tag(pb, "data");
135
136 put_flush_packet(pb);
137
138 return 0;
139}
140
141static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
10bb7023 142 UINT8 *buf, int size, int force_pts)
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143{
144 ByteIOContext *pb = &s->pb;
145 put_buffer(pb, buf, size);
146 return 0;
147}
148
149static int wav_write_trailer(AVFormatContext *s)
150{
151 ByteIOContext *pb = &s->pb;
152 WAVContext *wav = s->priv_data;
153 offset_t file_size;
154
155 if (!url_is_streamed(&s->pb)) {
156 end_tag(pb, wav->data);
157
158 /* update file size */
159 file_size = url_ftell(pb);
160 url_fseek(pb, 4, SEEK_SET);
67e9bb0d 161 put_le32(pb, (UINT32)(file_size - 8));
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162 url_fseek(pb, file_size, SEEK_SET);
163
164 put_flush_packet(pb);
165 }
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166 return 0;
167}
168
169/* return the size of the found tag */
170/* XXX: > 2GB ? */
8be1c656 171static int find_tag(ByteIOContext *pb, UINT32 tag1)
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172{
173 unsigned int tag;
174 int size;
175
176 for(;;) {
177 if (url_feof(pb))
178 return -1;
179 tag = get_le32(pb);
180 size = get_le32(pb);
181 if (tag == tag1)
182 break;
183 url_fseek(pb, size, SEEK_CUR);
184 }
185 if (size < 0)
186 size = 0x7fffffff;
187 return size;
188}
189
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190static int wav_probe(AVProbeData *p)
191{
192 /* check file header */
193 if (p->buf_size <= 32)
194 return 0;
195 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
196 p->buf[2] == 'F' && p->buf[3] == 'F' &&
197 p->buf[8] == 'W' && p->buf[9] == 'A' &&
198 p->buf[10] == 'V' && p->buf[11] == 'E')
199 return AVPROBE_SCORE_MAX;
200 else
201 return 0;
202}
203
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204/* wav input */
205static int wav_read_header(AVFormatContext *s,
206 AVFormatParameters *ap)
207{
208 int size;
209 unsigned int tag;
210 ByteIOContext *pb = &s->pb;
5ed8fafc 211 unsigned int id, channels, rate, bit_rate, extra_size, bps;
0147f198 212 unsigned int blkalign;
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213 AVStream *st;
214
215 /* check RIFF header */
216 tag = get_le32(pb);
217
218 if (tag != MKTAG('R', 'I', 'F', 'F'))
219 return -1;
220 get_le32(pb); /* file size */
221 tag = get_le32(pb);
222 if (tag != MKTAG('W', 'A', 'V', 'E'))
223 return -1;
224
225 /* parse fmt header */
226 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
227 if (size < 0)
228 return -1;
229 id = get_le16(pb);
230 channels = get_le16(pb);
231 rate = get_le32(pb);
232 bit_rate = get_le32(pb) * 8;
0147f198 233 blkalign = get_le16(pb); /* block align */
5ed8fafc 234 bps = get_le16(pb); /* bits per sample */
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235 if (size >= 18) {
236 /* wav_extra_size */
237 extra_size = get_le16(pb);
238 /* skip unused data */
239 url_fseek(pb, size - 18, SEEK_CUR);
240 }
241
242 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
243 if (size < 0)
244 return -1;
245
246 /* now we are ready: build format streams */
c9a65ca8 247 st = av_new_stream(s, 0);
de6d9b64 248 if (!st)
c9a65ca8 249 return AVERROR_NOMEM;
de6d9b64 250
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251 st->codec.codec_type = CODEC_TYPE_AUDIO;
252 st->codec.codec_tag = id;
46a3d068 253 st->codec.codec_id = wav_codec_get_id(id, bps);
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254 st->codec.channels = channels;
255 st->codec.sample_rate = rate;
0147f198 256 st->codec.block_align = blkalign;
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257 return 0;
258}
259
260#define MAX_SIZE 4096
261
262static int wav_read_packet(AVFormatContext *s,
263 AVPacket *pkt)
264{
265 int packet_size, n, ret;
266
267 if (url_feof(&s->pb))
268 return -EIO;
269 packet_size = url_get_packet_size(&s->pb);
270 n = MAX_SIZE / packet_size;
271 if (n <= 0)
272 return n = 1;
273 if (av_new_packet(pkt, n * packet_size))
274 return -EIO;
275 pkt->stream_index = 0;
276
277 ret = get_buffer(&s->pb, pkt->data, pkt->size);
278 if (ret < 0)
279 av_free_packet(pkt);
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280 /* note: we need to modify the packet size here to handle the last
281 packet */
282 pkt->size = ret;
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283 return ret;
284}
285
286static int wav_read_close(AVFormatContext *s)
287{
288 return 0;
289}
290
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291static AVInputFormat wav_iformat = {
292 "wav",
293 "wav format",
294 0,
295 wav_probe,
296 wav_read_header,
297 wav_read_packet,
298 wav_read_close,
299};
300
301static AVOutputFormat wav_oformat = {
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302 "wav",
303 "wav format",
304 "audio/x-wav",
305 "wav",
c9a65ca8 306 sizeof(WAVContext),
5ed8fafc 307 CODEC_ID_PCM_S16LE,
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308 CODEC_ID_NONE,
309 wav_write_header,
310 wav_write_packet,
311 wav_write_trailer,
de6d9b64 312};
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313
314int wav_init(void)
315{
316 av_register_input_format(&wav_iformat);
317 av_register_output_format(&wav_oformat);
318 return 0;
319}