Statistics
| Branch: | Revision:

ffmpeg / libavformat / wav.c @ 740e89cf

History | View | Annotate | Download (10.6 KB)

1
/*
2
 * WAV muxer and demuxer
3
 * Copyright (c) 2001, 2002 Fabrice Bellard
4
 *
5
 * Sony Wave64 demuxer
6
 * Copyright (c) 2009 Daniel Verkamp
7
 *
8
 * This file is part of FFmpeg.
9
 *
10
 * FFmpeg is free software; you can redistribute it and/or
11
 * modify it under the terms of the GNU Lesser General Public
12
 * License as published by the Free Software Foundation; either
13
 * version 2.1 of the License, or (at your option) any later version.
14
 *
15
 * FFmpeg is distributed in the hope that it will be useful,
16
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18
 * Lesser General Public License for more details.
19
 *
20
 * You should have received a copy of the GNU Lesser General Public
21
 * License along with FFmpeg; if not, write to the Free Software
22
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23
 */
24
#include "avformat.h"
25
#include "raw.h"
26
#include "riff.h"
27

    
28
typedef struct {
29
    int64_t data;
30
    int64_t data_end;
31
    int64_t minpts;
32
    int64_t maxpts;
33
    int last_duration;
34
    int w64;
35
} WAVContext;
36

    
37
#if CONFIG_WAV_MUXER
38
static int wav_write_header(AVFormatContext *s)
39
{
40
    WAVContext *wav = s->priv_data;
41
    ByteIOContext *pb = s->pb;
42
    int64_t fmt, fact;
43

    
44
    put_tag(pb, "RIFF");
45
    put_le32(pb, 0); /* file length */
46
    put_tag(pb, "WAVE");
47

    
48
    /* format header */
49
    fmt = ff_start_tag(pb, "fmt ");
50
    if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
51
        av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
52
               s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
53
        av_free(wav);
54
        return -1;
55
    }
56
    ff_end_tag(pb, fmt);
57

    
58
    if(s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
59
       && !url_is_streamed(s->pb)) {
60
        fact = ff_start_tag(pb, "fact");
61
        put_le32(pb, 0);
62
        ff_end_tag(pb, fact);
63
    }
64

    
65
    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
66
    wav->maxpts = wav->last_duration = 0;
67
    wav->minpts = INT64_MAX;
68

    
69
    /* data header */
70
    wav->data = ff_start_tag(pb, "data");
71

    
72
    put_flush_packet(pb);
73

    
74
    return 0;
75
}
76

    
77
static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
78
{
79
    ByteIOContext *pb = s->pb;
80
    WAVContext *wav = s->priv_data;
81
    put_buffer(pb, pkt->data, pkt->size);
82
    if(pkt->pts != AV_NOPTS_VALUE) {
83
        wav->minpts = FFMIN(wav->minpts, pkt->pts);
84
        wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
85
        wav->last_duration = pkt->duration;
86
    } else
87
        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
88
    return 0;
89
}
90

    
91
static int wav_write_trailer(AVFormatContext *s)
92
{
93
    ByteIOContext *pb = s->pb;
94
    WAVContext *wav = s->priv_data;
95
    int64_t file_size;
96

    
97
    if (!url_is_streamed(s->pb)) {
98
        ff_end_tag(pb, wav->data);
99

    
100
        /* update file size */
101
        file_size = url_ftell(pb);
102
        url_fseek(pb, 4, SEEK_SET);
103
        put_le32(pb, (uint32_t)(file_size - 8));
104
        url_fseek(pb, file_size, SEEK_SET);
105

    
106
        put_flush_packet(pb);
107

    
108
        if(s->streams[0]->codec->codec_tag != 0x01) {
109
            /* Update num_samps in fact chunk */
110
            int number_of_samples;
111
            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
112
                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
113
                                           s->streams[0]->time_base.den);
114
            url_fseek(pb, wav->data-12, SEEK_SET);
115
            put_le32(pb, number_of_samples);
116
            url_fseek(pb, file_size, SEEK_SET);
117
            put_flush_packet(pb);
118
        }
119
    }
120
    return 0;
121
}
122
#endif /* CONFIG_WAV_MUXER */
123

    
124
/* return the size of the found tag */
125
static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
126
{
127
    unsigned int tag;
128
    int64_t size;
129

    
130
    for(;;) {
131
        if (url_feof(pb))
132
            return -1;
133
        tag = get_le32(pb);
134
        size = get_le32(pb);
135
        if (tag == tag1)
136
            break;
137
        url_fseek(pb, size, SEEK_CUR);
138
    }
139
    return size;
140
}
141

    
142
static int wav_probe(AVProbeData *p)
143
{
144
    /* check file header */
145
    if (p->buf_size <= 32)
146
        return 0;
147
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
148
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
149
        p->buf[8] == 'W' && p->buf[9] == 'A' &&
150
        p->buf[10] == 'V' && p->buf[11] == 'E')
151
        /*
152
          Since ACT demuxer has standard WAV header at top of it's own,
153
          returning score is decreased to avoid probe conflict
154
          between ACT and WAV.
155
        */
156
        return AVPROBE_SCORE_MAX - 1;
157
    else
158
        return 0;
159
}
160

    
161
/* wav input */
162
static int wav_read_header(AVFormatContext *s,
163
                           AVFormatParameters *ap)
164
{
165
    int64_t size;
166
    unsigned int tag;
167
    ByteIOContext *pb = s->pb;
168
    AVStream *st;
169
    WAVContext *wav = s->priv_data;
170

    
171
    /* check RIFF header */
172
    tag = get_le32(pb);
173

    
174
    if (tag != MKTAG('R', 'I', 'F', 'F'))
175
        return -1;
176
    get_le32(pb); /* file size */
177
    tag = get_le32(pb);
178
    if (tag != MKTAG('W', 'A', 'V', 'E'))
179
        return -1;
180

    
181
    /* parse fmt header */
182
    size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
183
    if (size < 0)
184
        return -1;
185
    st = av_new_stream(s, 0);
186
    if (!st)
187
        return AVERROR(ENOMEM);
188

    
189
    ff_get_wav_header(pb, st->codec, size);
190
    st->need_parsing = AVSTREAM_PARSE_FULL;
191

    
192
    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
193

    
194
    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
195
    if (size < 0)
196
        return -1;
197
    wav->data_end= url_ftell(pb) + size;
198
    return 0;
199
}
200

    
201
#if CONFIG_W64_DEMUXER
202

    
203
static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
204
    0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
205

    
206
static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
207
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
208

    
209
static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
210
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
211

    
212
static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
213
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
214

    
215
static int w64_probe(AVProbeData *p)
216
{
217
    if (p->buf_size <= 40)
218
        return 0;
219
    if (!memcmp(p->buf,      guid_riff, 16) &&
220
        !memcmp(p->buf + 24, guid_wave, 16)) {
221
        return AVPROBE_SCORE_MAX;
222
    } else
223
        return 0;
224
}
225

    
226
/** Find chunk with w64 GUID by skipping over other chunks
227
 * @return the size of the found chunk
228
 */
229
static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
230
{
231
    uint8_t guid[16];
232
    int64_t size;
233

    
234
    while (!url_feof(pb)) {
235
        get_buffer(pb, guid, 16);
236
        size = get_le64(pb);
237
        if (size <= 24)
238
            return -1;
239
        if (!memcmp(guid, guid1, 16))
240
            return size;
241
        url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
242
    }
243
    return -1;
244
}
245

    
246
static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
247
{
248
    int64_t size;
249
    ByteIOContext *pb = s->pb;
250
    WAVContext *wav   = s->priv_data;
251
    AVStream *st;
252
    uint8_t guid[16];
253

    
254
    get_buffer(pb, guid, 16);
255
    if (memcmp(guid, guid_riff, 16))
256
        return -1;
257

    
258
    if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
259
        return -1;
260

    
261
    get_buffer(pb, guid, 16);
262
    if (memcmp(guid, guid_wave, 16)) {
263
        av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
264
        return -1;
265
    }
266

    
267
    size = find_guid(pb, guid_fmt);
268
    if (size < 0) {
269
        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
270
        return -1;
271
    }
272

    
273
    st = av_new_stream(s, 0);
274
    if (!st)
275
        return AVERROR(ENOMEM);
276

    
277
    /* subtract chunk header size - normal wav file doesn't count it */
278
    ff_get_wav_header(pb, st->codec, size - 24);
279
    url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
280

    
281
    st->need_parsing = AVSTREAM_PARSE_FULL;
282

    
283
    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
284

    
285
    size = find_guid(pb, guid_data);
286
    if (size < 0) {
287
        av_log(s, AV_LOG_ERROR, "could not find data guid\n");
288
        return -1;
289
    }
290
    wav->data_end = url_ftell(pb) + size - 24;
291
    wav->w64 = 1;
292

    
293
    return 0;
294
}
295
#endif /* CONFIG_W64_DEMUXER */
296

    
297
#define MAX_SIZE 4096
298

    
299
static int wav_read_packet(AVFormatContext *s,
300
                           AVPacket *pkt)
301
{
302
    int ret, size;
303
    int64_t left;
304
    AVStream *st;
305
    WAVContext *wav = s->priv_data;
306

    
307
    if (url_feof(s->pb))
308
        return AVERROR(EIO);
309
    st = s->streams[0];
310

    
311
    left= wav->data_end - url_ftell(s->pb);
312
    if(left <= 0){
313
        if (CONFIG_W64_DEMUXER && wav->w64) {
314
            left = find_guid(s->pb, guid_data) - 24;
315
        } else
316
        left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
317
        if (left < 0) {
318
            return AVERROR(EIO);
319
        }
320
        wav->data_end= url_ftell(s->pb) + left;
321
    }
322

    
323
    size = MAX_SIZE;
324
    if (st->codec->block_align > 1) {
325
        if (size < st->codec->block_align)
326
            size = st->codec->block_align;
327
        size = (size / st->codec->block_align) * st->codec->block_align;
328
    }
329
    size= FFMIN(size, left);
330
    ret= av_get_packet(s->pb, pkt, size);
331
    if (ret <= 0)
332
        return AVERROR(EIO);
333
    pkt->stream_index = 0;
334

    
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_seek(AVFormatContext *s,
342
                         int stream_index, int64_t timestamp, int flags)
343
{
344
    AVStream *st;
345

    
346
    st = s->streams[0];
347
    switch(st->codec->codec_id) {
348
    case CODEC_ID_MP2:
349
    case CODEC_ID_MP3:
350
    case CODEC_ID_AC3:
351
    case CODEC_ID_DTS:
352
        /* use generic seeking with dynamically generated indexes */
353
        return -1;
354
    default:
355
        break;
356
    }
357
    return pcm_read_seek(s, stream_index, timestamp, flags);
358
}
359

    
360
#if CONFIG_WAV_DEMUXER
361
AVInputFormat wav_demuxer = {
362
    "wav",
363
    NULL_IF_CONFIG_SMALL("WAV format"),
364
    sizeof(WAVContext),
365
    wav_probe,
366
    wav_read_header,
367
    wav_read_packet,
368
    NULL,
369
    wav_read_seek,
370
    .flags= AVFMT_GENERIC_INDEX,
371
    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
372
};
373
#endif
374
#if CONFIG_WAV_MUXER
375
AVOutputFormat wav_muxer = {
376
    "wav",
377
    NULL_IF_CONFIG_SMALL("WAV format"),
378
    "audio/x-wav",
379
    "wav",
380
    sizeof(WAVContext),
381
    CODEC_ID_PCM_S16LE,
382
    CODEC_ID_NONE,
383
    wav_write_header,
384
    wav_write_packet,
385
    wav_write_trailer,
386
    .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
387
};
388
#endif
389
#if CONFIG_W64_DEMUXER
390
AVInputFormat w64_demuxer = {
391
    "w64",
392
    NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
393
    sizeof(WAVContext),
394
    w64_probe,
395
    w64_read_header,
396
    wav_read_packet,
397
    NULL,
398
    wav_read_seek,
399
    .flags = AVFMT_GENERIC_INDEX,
400
    .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
401
};
402
#endif