1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
|
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <arpa/inet.h>
#undef NDEBUG
#include <assert.h>
#include <ctype.h>
#include <pthread.h>
#include <media/stagefright/MPEG4Writer.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MetaData.h>
#include <media/stagefright/MediaSource.h>
#include <media/stagefright/Utils.h>
namespace android {
class MPEG4Writer::Track {
public:
Track(MPEG4Writer *owner,
const sp<MetaData> &meta, const sp<MediaSource> &source);
~Track();
void start();
void stop();
int64_t getDuration() const;
void writeTrackHeader(int32_t trackID);
private:
MPEG4Writer *mOwner;
sp<MetaData> mMeta;
sp<MediaSource> mSource;
volatile bool mDone;
pthread_t mThread;
struct SampleInfo {
size_t size;
off_t offset;
int64_t timestamp;
};
List<SampleInfo> mSampleInfos;
void *mCodecSpecificData;
size_t mCodecSpecificDataSize;
static void *ThreadWrapper(void *me);
void threadEntry();
Track(const Track &);
Track &operator=(const Track &);
};
MPEG4Writer::MPEG4Writer(const char *filename)
: mFile(fopen(filename, "wb")),
mOffset(0),
mMdatOffset(0) {
assert(mFile != NULL);
}
MPEG4Writer::~MPEG4Writer() {
stop();
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
delete *it;
}
mTracks.clear();
}
void MPEG4Writer::addSource(
const sp<MetaData> &meta, const sp<MediaSource> &source) {
Track *track = new Track(this, meta, source);
mTracks.push_back(track);
}
void MPEG4Writer::start() {
if (mFile == NULL) {
return;
}
beginBox("ftyp");
writeFourcc("isom");
writeInt32(0);
writeFourcc("isom");
endBox();
mMdatOffset = mOffset;
write("\x00\x00\x00\x01mdat????????", 16);
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
(*it)->start();
}
}
void MPEG4Writer::stop() {
if (mFile == NULL) {
return;
}
int64_t max_duration = 0;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
(*it)->stop();
int64_t duration = (*it)->getDuration();
if (duration > max_duration) {
max_duration = duration;
}
}
// Fix up the size of the 'mdat' chunk.
fseek(mFile, mMdatOffset + 8, SEEK_SET);
int64_t size = mOffset - mMdatOffset;
size = hton64(size);
fwrite(&size, 1, 8, mFile);
fseek(mFile, mOffset, SEEK_SET);
time_t now = time(NULL);
beginBox("moov");
beginBox("mvhd");
writeInt32(0); // version=0, flags=0
writeInt32(now); // creation time
writeInt32(now); // modification time
writeInt32(1000); // timescale
writeInt32(max_duration);
writeInt32(0x10000); // rate
writeInt16(0x100); // volume
writeInt16(0); // reserved
writeInt32(0); // reserved
writeInt32(0); // reserved
writeInt32(0x10000); // matrix
writeInt32(0);
writeInt32(0);
writeInt32(0);
writeInt32(0x10000);
writeInt32(0);
writeInt32(0);
writeInt32(0);
writeInt32(0x40000000);
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(mTracks.size() + 1); // nextTrackID
endBox(); // mvhd
int32_t id = 1;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it, ++id) {
(*it)->writeTrackHeader(id);
}
endBox(); // moov
assert(mBoxes.empty());
fclose(mFile);
mFile = NULL;
}
off_t MPEG4Writer::addSample(MediaBuffer *buffer) {
Mutex::Autolock autoLock(mLock);
off_t old_offset = mOffset;
fwrite((const uint8_t *)buffer->data() + buffer->range_offset(),
1, buffer->range_length(), mFile);
mOffset += buffer->range_length();
return old_offset;
}
void MPEG4Writer::beginBox(const char *fourcc) {
assert(strlen(fourcc) == 4);
mBoxes.push_back(mOffset);
writeInt32(0);
writeFourcc(fourcc);
}
void MPEG4Writer::endBox() {
assert(!mBoxes.empty());
off_t offset = *--mBoxes.end();
mBoxes.erase(--mBoxes.end());
fseek(mFile, offset, SEEK_SET);
writeInt32(mOffset - offset);
mOffset -= 4;
fseek(mFile, mOffset, SEEK_SET);
}
void MPEG4Writer::writeInt8(int8_t x) {
fwrite(&x, 1, 1, mFile);
++mOffset;
}
void MPEG4Writer::writeInt16(int16_t x) {
x = htons(x);
fwrite(&x, 1, 2, mFile);
mOffset += 2;
}
void MPEG4Writer::writeInt32(int32_t x) {
x = htonl(x);
fwrite(&x, 1, 4, mFile);
mOffset += 4;
}
void MPEG4Writer::writeInt64(int64_t x) {
x = hton64(x);
fwrite(&x, 1, 8, mFile);
mOffset += 8;
}
void MPEG4Writer::writeCString(const char *s) {
size_t n = strlen(s);
fwrite(s, 1, n + 1, mFile);
mOffset += n + 1;
}
void MPEG4Writer::writeFourcc(const char *s) {
assert(strlen(s) == 4);
fwrite(s, 1, 4, mFile);
mOffset += 4;
}
void MPEG4Writer::write(const void *data, size_t size) {
fwrite(data, 1, size, mFile);
mOffset += size;
}
////////////////////////////////////////////////////////////////////////////////
MPEG4Writer::Track::Track(
MPEG4Writer *owner,
const sp<MetaData> &meta, const sp<MediaSource> &source)
: mOwner(owner),
mMeta(meta),
mSource(source),
mDone(false),
mCodecSpecificData(NULL),
mCodecSpecificDataSize(0) {
}
MPEG4Writer::Track::~Track() {
stop();
if (mCodecSpecificData != NULL) {
free(mCodecSpecificData);
mCodecSpecificData = NULL;
}
}
void MPEG4Writer::Track::start() {
mSource->start();
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
mDone = false;
int err = pthread_create(&mThread, &attr, ThreadWrapper, this);
assert(err == 0);
pthread_attr_destroy(&attr);
}
void MPEG4Writer::Track::stop() {
if (mDone) {
return;
}
mDone = true;
void *dummy;
pthread_join(mThread, &dummy);
mSource->stop();
}
// static
void *MPEG4Writer::Track::ThreadWrapper(void *me) {
Track *track = static_cast<Track *>(me);
track->threadEntry();
return NULL;
}
void MPEG4Writer::Track::threadEntry() {
bool is_mpeg4 = false;
sp<MetaData> meta = mSource->getFormat();
const char *mime;
meta->findCString(kKeyMIMEType, &mime);
is_mpeg4 = !strcasecmp(mime, "video/mp4v-es");
MediaBuffer *buffer;
while (!mDone && mSource->read(&buffer) == OK) {
if (buffer->range_length() == 0) {
buffer->release();
buffer = NULL;
continue;
}
if (mCodecSpecificData == NULL && is_mpeg4) {
const uint8_t *data =
(const uint8_t *)buffer->data() + buffer->range_offset();
const size_t size = buffer->range_length();
size_t offset = 0;
while (offset + 3 < size) {
if (data[offset] == 0x00 && data[offset + 1] == 0x00
&& data[offset + 2] == 0x01 && data[offset + 3] == 0xb6) {
break;
}
++offset;
}
// assert(offset + 3 < size);
if (offset + 3 >= size) {
// XXX assume the entire first chunk of data is the codec specific
// data.
offset = size;
}
mCodecSpecificDataSize = offset;
mCodecSpecificData = malloc(offset);
memcpy(mCodecSpecificData, data, offset);
buffer->set_range(buffer->range_offset() + offset, size - offset);
}
off_t offset = mOwner->addSample(buffer);
SampleInfo info;
info.size = buffer->range_length();
info.offset = offset;
int32_t units, scale;
bool success =
buffer->meta_data()->findInt32(kKeyTimeUnits, &units);
assert(success);
success =
buffer->meta_data()->findInt32(kKeyTimeScale, &scale);
assert(success);
info.timestamp = (int64_t)units * 1000 / scale;
mSampleInfos.push_back(info);
buffer->release();
buffer = NULL;
}
}
int64_t MPEG4Writer::Track::getDuration() const {
return 10000; // XXX
}
void MPEG4Writer::Track::writeTrackHeader(int32_t trackID) {
const char *mime;
bool success = mMeta->findCString(kKeyMIMEType, &mime);
assert(success);
bool is_audio = !strncasecmp(mime, "audio/", 6);
time_t now = time(NULL);
mOwner->beginBox("trak");
mOwner->beginBox("tkhd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(now); // creation time
mOwner->writeInt32(now); // modification time
mOwner->writeInt32(trackID);
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(getDuration());
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // layer
mOwner->writeInt16(0); // alternate group
mOwner->writeInt16(is_audio ? 0x100 : 0); // volume
mOwner->writeInt16(0); // reserved
mOwner->writeInt32(0x10000); // matrix
mOwner->writeInt32(0);
mOwner->writeInt32(0);
mOwner->writeInt32(0);
mOwner->writeInt32(0x10000);
mOwner->writeInt32(0);
mOwner->writeInt32(0);
mOwner->writeInt32(0);
mOwner->writeInt32(0x40000000);
if (is_audio) {
mOwner->writeInt32(0);
mOwner->writeInt32(0);
} else {
int32_t width, height;
bool success = mMeta->findInt32(kKeyWidth, &width);
success = success && mMeta->findInt32(kKeyHeight, &height);
assert(success);
mOwner->writeInt32(width);
mOwner->writeInt32(height);
}
mOwner->endBox(); // tkhd
mOwner->beginBox("mdia");
mOwner->beginBox("mdhd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(now); // creation time
mOwner->writeInt32(now); // modification time
mOwner->writeInt32(1000); // timescale
mOwner->writeInt32(getDuration());
mOwner->writeInt16(0); // language code XXX
mOwner->writeInt16(0); // predefined
mOwner->endBox();
mOwner->beginBox("hdlr");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(0); // predefined
mOwner->writeFourcc(is_audio ? "soun" : "vide");
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeCString(""); // name
mOwner->endBox();
mOwner->beginBox("minf");
mOwner->beginBox("dinf");
mOwner->beginBox("dref");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(1);
mOwner->beginBox("url ");
mOwner->writeInt32(1); // version=0, flags=1
mOwner->endBox(); // url
mOwner->endBox(); // dref
mOwner->endBox(); // dinf
if (is_audio) {
mOwner->beginBox("smhd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt16(0); // balance
mOwner->writeInt16(0); // reserved
mOwner->endBox();
} else {
mOwner->beginBox("vmhd");
mOwner->writeInt32(0x00000001); // version=0, flags=1
mOwner->writeInt16(0); // graphics mode
mOwner->writeInt16(0); // opcolor
mOwner->writeInt16(0);
mOwner->writeInt16(0);
mOwner->endBox();
}
mOwner->endBox(); // minf
mOwner->beginBox("stbl");
mOwner->beginBox("stsd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(1); // entry count
if (is_audio) {
mOwner->beginBox("xxxx"); // audio format XXX
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // reserved
mOwner->writeInt16(0); // data ref index
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(2); // channel count
mOwner->writeInt16(16); // sample size
mOwner->writeInt16(0); // predefined
mOwner->writeInt16(0); // reserved
int32_t samplerate;
bool success = mMeta->findInt32(kKeySampleRate, &samplerate);
assert(success);
mOwner->writeInt32(samplerate << 16);
mOwner->endBox();
} else {
if (!strcasecmp("video/mp4v-es", mime)) {
mOwner->beginBox("mp4v");
} else if (!strcasecmp("video/3gpp", mime)) {
mOwner->beginBox("s263");
} else {
assert(!"should not be here, unknown mime type.");
}
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // reserved
mOwner->writeInt16(0); // data ref index
mOwner->writeInt16(0); // predefined
mOwner->writeInt16(0); // reserved
mOwner->writeInt32(0); // predefined
mOwner->writeInt32(0); // predefined
mOwner->writeInt32(0); // predefined
int32_t width, height;
bool success = mMeta->findInt32(kKeyWidth, &width);
success = success && mMeta->findInt32(kKeyHeight, &height);
assert(success);
mOwner->writeInt16(width);
mOwner->writeInt16(height);
mOwner->writeInt32(0x480000); // horiz resolution
mOwner->writeInt32(0x480000); // vert resolution
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(1); // frame count
mOwner->write(" ", 32);
mOwner->writeInt16(0x18); // depth
mOwner->writeInt16(-1); // predefined
assert(23 + mCodecSpecificDataSize < 128);
if (!strcasecmp("video/mp4v-es", mime)) {
mOwner->beginBox("esds");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt8(0x03); // ES_DescrTag
mOwner->writeInt8(23 + mCodecSpecificDataSize);
mOwner->writeInt16(0x0000); // ES_ID
mOwner->writeInt8(0x1f);
mOwner->writeInt8(0x04); // DecoderConfigDescrTag
mOwner->writeInt8(15 + mCodecSpecificDataSize);
mOwner->writeInt8(0x20); // objectTypeIndication ISO/IEC 14492-2
mOwner->writeInt8(0x11); // streamType VisualStream
static const uint8_t kData[] = {
0x01, 0x77, 0x00,
0x00, 0x03, 0xe8, 0x00,
0x00, 0x03, 0xe8, 0x00
};
mOwner->write(kData, sizeof(kData));
mOwner->writeInt8(0x05); // DecoderSpecificInfoTag
mOwner->writeInt8(mCodecSpecificDataSize);
mOwner->write(mCodecSpecificData, mCodecSpecificDataSize);
static const uint8_t kData2[] = {
0x06, // SLConfigDescriptorTag
0x01,
0x02
};
mOwner->write(kData2, sizeof(kData2));
mOwner->endBox(); // esds
} else if (!strcasecmp("video/3gpp", mime)) {
mOwner->beginBox("d263");
mOwner->writeInt32(0); // vendor
mOwner->writeInt8(0); // decoder version
mOwner->writeInt8(10); // level: 10
mOwner->writeInt8(0); // profile: 0
mOwner->endBox(); // d263
}
mOwner->endBox(); // mp4v or s263
}
mOwner->endBox(); // stsd
mOwner->beginBox("stts");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(mSampleInfos.size() - 1);
List<SampleInfo>::iterator it = mSampleInfos.begin();
int64_t last = (*it).timestamp;
++it;
while (it != mSampleInfos.end()) {
mOwner->writeInt32(1);
mOwner->writeInt32((*it).timestamp - last);
last = (*it).timestamp;
++it;
}
mOwner->endBox(); // stts
mOwner->beginBox("stsz");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(0); // default sample size
mOwner->writeInt32(mSampleInfos.size());
for (List<SampleInfo>::iterator it = mSampleInfos.begin();
it != mSampleInfos.end(); ++it) {
mOwner->writeInt32((*it).size);
}
mOwner->endBox(); // stsz
mOwner->beginBox("stsc");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(mSampleInfos.size());
int32_t n = 1;
for (List<SampleInfo>::iterator it = mSampleInfos.begin();
it != mSampleInfos.end(); ++it, ++n) {
mOwner->writeInt32(n);
mOwner->writeInt32(1);
mOwner->writeInt32(1);
}
mOwner->endBox(); // stsc
mOwner->beginBox("co64");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(mSampleInfos.size());
for (List<SampleInfo>::iterator it = mSampleInfos.begin();
it != mSampleInfos.end(); ++it, ++n) {
mOwner->writeInt64((*it).offset);
}
mOwner->endBox(); // co64
mOwner->endBox(); // stbl
mOwner->endBox(); // mdia
mOwner->endBox(); // trak
}
} // namespace android
|