restoring OS/2 compatibility patch by ("Slavik Gnatenko" <miracle9 at newmail dot...
[libav.git] / libavformat / wav.c
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1/*
2 * WAV encoder and decoder
e095026a 3 * Copyright (c) 2001, 2002 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
e8c00089 22const CodecTag 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 { CODEC_ID_WMAV1, 0x160 },
33 { CODEC_ID_WMAV2, 0x161 },
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34 { 0, 0 },
35};
36
37/* WAVEFORMATEX header */
afc25d93 38/* returns the size or -1 on error */
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39int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
40{
86bec9a1 41 int tag, bps, blkalign, bytespersec;
afc25d93 42 int hdrsize = 18;
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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);
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48 put_le16(pb, enc->channels);
49 put_le32(pb, enc->sample_rate);
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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;
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56 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
57 bps = 4;
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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;
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65 } else if (enc->block_align != 0) { /* specified by the codec */
66 blkalign = enc->block_align;
4b1f4f23 67 } else
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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;
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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 */
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86 } else if (enc->codec_id == CODEC_ID_MP2) {
87 put_le16(pb, 22); /* wav_extra_size */
afc25d93 88 hdrsize += 22;
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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 */
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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 */
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100 } else
101 put_le16(pb, 0); /* wav_extra_size */
102
afc25d93 103 return hdrsize;
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104}
105
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106void get_wav_header(ByteIOContext *pb, AVCodecContext *codec,
107 int has_extra_data)
108{
e8c00089 109 int id;
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110
111 id = get_le16(pb);
112 codec->codec_type = CODEC_TYPE_AUDIO;
113 codec->codec_tag = id;
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114 codec->channels = get_le16(pb);
115 codec->sample_rate = get_le32(pb);
116 codec->bit_rate = get_le32(pb) * 8;
117 codec->block_align = get_le16(pb);
7004ffb3 118 codec->bits_per_sample = get_le16(pb); /* bits per sample */
e8c00089 119 codec->codec_id = wav_codec_get_id(id, codec->frame_bits);
e095026a 120 if (has_extra_data) {
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121 codec->extradata_size = get_le16(pb);
122 if (codec->extradata_size > 0) {
123 codec->extradata = av_mallocz(codec->extradata_size);
124 get_buffer(pb, codec->extradata, codec->extradata_size);
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125 }
126 }
127}
128
129
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130int wav_codec_get_id(unsigned int tag, int bps)
131{
132 int id;
133 id = codec_get_id(codec_wav_tags, tag);
134 if (id <= 0)
135 return id;
136 /* handle specific u8 codec */
137 if (id == CODEC_ID_PCM_S16LE && bps == 8)
138 id = CODEC_ID_PCM_U8;
139 return id;
140}
141
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142typedef struct {
143 offset_t data;
144} WAVContext;
145
146static int wav_write_header(AVFormatContext *s)
147{
c9a65ca8 148 WAVContext *wav = s->priv_data;
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149 ByteIOContext *pb = &s->pb;
150 offset_t fmt;
151
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152 put_tag(pb, "RIFF");
153 put_le32(pb, 0); /* file length */
154 put_tag(pb, "WAVE");
155
156 /* format header */
157 fmt = start_tag(pb, "fmt ");
46a3d068 158 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
1ea4f593 159 av_free(wav);
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160 return -1;
161 }
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162 end_tag(pb, fmt);
163
164 /* data header */
165 wav->data = start_tag(pb, "data");
166
167 put_flush_packet(pb);
168
169 return 0;
170}
171
172static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
0c1a9eda 173 uint8_t *buf, int size, int force_pts)
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174{
175 ByteIOContext *pb = &s->pb;
176 put_buffer(pb, buf, size);
177 return 0;
178}
179
180static int wav_write_trailer(AVFormatContext *s)
181{
182 ByteIOContext *pb = &s->pb;
183 WAVContext *wav = s->priv_data;
184 offset_t file_size;
185
186 if (!url_is_streamed(&s->pb)) {
187 end_tag(pb, wav->data);
188
189 /* update file size */
190 file_size = url_ftell(pb);
191 url_fseek(pb, 4, SEEK_SET);
0c1a9eda 192 put_le32(pb, (uint32_t)(file_size - 8));
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193 url_fseek(pb, file_size, SEEK_SET);
194
195 put_flush_packet(pb);
196 }
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197 return 0;
198}
199
200/* return the size of the found tag */
201/* XXX: > 2GB ? */
0c1a9eda 202static int find_tag(ByteIOContext *pb, uint32_t tag1)
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203{
204 unsigned int tag;
205 int size;
206
207 for(;;) {
208 if (url_feof(pb))
209 return -1;
210 tag = get_le32(pb);
211 size = get_le32(pb);
212 if (tag == tag1)
213 break;
214 url_fseek(pb, size, SEEK_CUR);
215 }
216 if (size < 0)
217 size = 0x7fffffff;
218 return size;
219}
220
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221static int wav_probe(AVProbeData *p)
222{
223 /* check file header */
224 if (p->buf_size <= 32)
225 return 0;
226 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
227 p->buf[2] == 'F' && p->buf[3] == 'F' &&
228 p->buf[8] == 'W' && p->buf[9] == 'A' &&
229 p->buf[10] == 'V' && p->buf[11] == 'E')
230 return AVPROBE_SCORE_MAX;
231 else
232 return 0;
233}
234
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235/* wav input */
236static int wav_read_header(AVFormatContext *s,
237 AVFormatParameters *ap)
238{
239 int size;
240 unsigned int tag;
241 ByteIOContext *pb = &s->pb;
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242 AVStream *st;
243
244 /* check RIFF header */
245 tag = get_le32(pb);
246
247 if (tag != MKTAG('R', 'I', 'F', 'F'))
248 return -1;
249 get_le32(pb); /* file size */
250 tag = get_le32(pb);
251 if (tag != MKTAG('W', 'A', 'V', 'E'))
252 return -1;
253
254 /* parse fmt header */
255 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
256 if (size < 0)
257 return -1;
c9a65ca8 258 st = av_new_stream(s, 0);
de6d9b64 259 if (!st)
c9a65ca8 260 return AVERROR_NOMEM;
de6d9b64 261
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262 get_wav_header(pb, &st->codec, (size >= 18));
263
264 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
265 if (size < 0)
266 return -1;
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267 return 0;
268}
269
270#define MAX_SIZE 4096
271
272static int wav_read_packet(AVFormatContext *s,
273 AVPacket *pkt)
274{
94ef6864 275 int ret;
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276
277 if (url_feof(&s->pb))
278 return -EIO;
94ef6864 279 if (av_new_packet(pkt, MAX_SIZE))
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280 return -EIO;
281 pkt->stream_index = 0;
282
283 ret = get_buffer(&s->pb, pkt->data, pkt->size);
284 if (ret < 0)
285 av_free_packet(pkt);
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286 /* note: we need to modify the packet size here to handle the last
287 packet */
288 pkt->size = ret;
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289 return ret;
290}
291
292static int wav_read_close(AVFormatContext *s)
293{
294 return 0;
295}
296
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297static AVInputFormat wav_iformat = {
298 "wav",
299 "wav format",
300 0,
301 wav_probe,
302 wav_read_header,
303 wav_read_packet,
304 wav_read_close,
305};
306
307static AVOutputFormat wav_oformat = {
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308 "wav",
309 "wav format",
310 "audio/x-wav",
311 "wav",
c9a65ca8 312 sizeof(WAVContext),
5ed8fafc 313 CODEC_ID_PCM_S16LE,
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314 CODEC_ID_NONE,
315 wav_write_header,
316 wav_write_packet,
317 wav_write_trailer,
de6d9b64 318};
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319
320int wav_init(void)
321{
322 av_register_input_format(&wav_iformat);
323 av_register_output_format(&wav_oformat);
324 return 0;
325}