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
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/base/android/media_decoder_job.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/debug/trace_event.h"
#include "base/message_loop/message_loop_proxy.h"
#include "media/base/android/media_codec_bridge.h"
#include "media/base/bind_to_loop.h"
#include "media/base/buffers.h"
namespace media {
// Timeout value for media codec operations. Because the first
// DequeInputBuffer() can take about 150 milliseconds, use 250 milliseconds
// here. See http://b/9357571.
static const int kMediaCodecTimeoutInMilliseconds = 250;
MediaDecoderJob::MediaDecoderJob(
const scoped_refptr<base::SingleThreadTaskRunner>& decoder_task_runner,
MediaCodecBridge* media_codec_bridge,
const base::Closure& request_data_cb)
: ui_task_runner_(base::MessageLoopProxy::current()),
decoder_task_runner_(decoder_task_runner),
media_codec_bridge_(media_codec_bridge),
needs_flush_(false),
input_eos_encountered_(false),
output_eos_encountered_(false),
skip_eos_enqueue_(true),
prerolling_(true),
weak_this_(this),
request_data_cb_(request_data_cb),
access_unit_index_(0),
input_buf_index_(-1),
stop_decode_pending_(false),
destroy_pending_(false) {
}
MediaDecoderJob::~MediaDecoderJob() {}
void MediaDecoderJob::OnDataReceived(const DemuxerData& data) {
DVLOG(1) << __FUNCTION__ << ": " << data.access_units.size() << " units";
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(!on_data_received_cb_.is_null());
TRACE_EVENT_ASYNC_END2(
"media", "MediaDecoderJob::RequestData", this,
"Data type", data.type == media::DemuxerStream::AUDIO ? "AUDIO" : "VIDEO",
"Units read", data.access_units.size());
base::Closure done_cb = base::ResetAndReturn(&on_data_received_cb_);
if (stop_decode_pending_) {
OnDecodeCompleted(MEDIA_CODEC_STOPPED, kNoTimestamp(), 0);
return;
}
access_unit_index_ = 0;
received_data_ = data;
done_cb.Run();
}
void MediaDecoderJob::Prefetch(const base::Closure& prefetch_cb) {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(on_data_received_cb_.is_null());
DCHECK(decode_cb_.is_null());
if (HasData()) {
DVLOG(1) << __FUNCTION__ << " : using previously received data";
ui_task_runner_->PostTask(FROM_HERE, prefetch_cb);
return;
}
DVLOG(1) << __FUNCTION__ << " : requesting data";
RequestData(prefetch_cb);
}
bool MediaDecoderJob::Decode(
const base::TimeTicks& start_time_ticks,
const base::TimeDelta& start_presentation_timestamp,
const DecoderCallback& callback) {
DCHECK(decode_cb_.is_null());
DCHECK(on_data_received_cb_.is_null());
DCHECK(ui_task_runner_->BelongsToCurrentThread());
decode_cb_ = callback;
if (!HasData()) {
RequestData(base::Bind(&MediaDecoderJob::DecodeNextAccessUnit,
base::Unretained(this),
start_time_ticks,
start_presentation_timestamp));
return true;
}
if (DemuxerStream::kConfigChanged ==
received_data_.access_units[access_unit_index_].status) {
// Clear received data because we need to handle a config change.
decode_cb_.Reset();
received_data_ = DemuxerData();
access_unit_index_ = 0;
return false;
}
DecodeNextAccessUnit(start_time_ticks, start_presentation_timestamp);
return true;
}
void MediaDecoderJob::StopDecode() {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(is_decoding());
stop_decode_pending_ = true;
}
void MediaDecoderJob::Flush() {
DCHECK(decode_cb_.is_null());
// Do nothing, flush when the next Decode() happens.
needs_flush_ = true;
received_data_ = DemuxerData();
input_eos_encountered_ = false;
access_unit_index_ = 0;
on_data_received_cb_.Reset();
}
void MediaDecoderJob::BeginPrerolling(
const base::TimeDelta& preroll_timestamp) {
DVLOG(1) << __FUNCTION__ << "(" << preroll_timestamp.InSecondsF() << ")";
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(!is_decoding());
preroll_timestamp_ = preroll_timestamp;
prerolling_ = true;
}
void MediaDecoderJob::Release() {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DVLOG(1) << __FUNCTION__;
// If the decoder job is not waiting for data, and is still decoding, we
// cannot delete the job immediately.
destroy_pending_ = on_data_received_cb_.is_null() && is_decoding();
request_data_cb_.Reset();
on_data_received_cb_.Reset();
decode_cb_.Reset();
if (destroy_pending_) {
DVLOG(1) << __FUNCTION__ << " : delete is pending decode completion";
return;
}
delete this;
}
MediaCodecStatus MediaDecoderJob::QueueInputBuffer(const AccessUnit& unit) {
DVLOG(1) << __FUNCTION__;
DCHECK(decoder_task_runner_->BelongsToCurrentThread());
TRACE_EVENT0("media", __FUNCTION__);
int input_buf_index = input_buf_index_;
input_buf_index_ = -1;
// TODO(xhwang): Hide DequeueInputBuffer() and the index in MediaCodecBridge.
if (input_buf_index == -1) {
base::TimeDelta timeout = base::TimeDelta::FromMilliseconds(
kMediaCodecTimeoutInMilliseconds);
MediaCodecStatus status =
media_codec_bridge_->DequeueInputBuffer(timeout, &input_buf_index);
if (status != MEDIA_CODEC_OK) {
DVLOG(1) << "DequeueInputBuffer fails: " << status;
return status;
}
}
// TODO(qinmin): skip frames if video is falling far behind.
DCHECK_GE(input_buf_index, 0);
if (unit.end_of_stream || unit.data.empty()) {
media_codec_bridge_->QueueEOS(input_buf_index);
return MEDIA_CODEC_INPUT_END_OF_STREAM;
}
if (unit.key_id.empty() || unit.iv.empty()) {
DCHECK(unit.iv.empty() || !unit.key_id.empty());
return media_codec_bridge_->QueueInputBuffer(
input_buf_index, &unit.data[0], unit.data.size(), unit.timestamp);
}
MediaCodecStatus status = media_codec_bridge_->QueueSecureInputBuffer(
input_buf_index,
&unit.data[0], unit.data.size(),
reinterpret_cast<const uint8*>(&unit.key_id[0]), unit.key_id.size(),
reinterpret_cast<const uint8*>(&unit.iv[0]), unit.iv.size(),
unit.subsamples.empty() ? NULL : &unit.subsamples[0],
unit.subsamples.size(),
unit.timestamp);
// In case of MEDIA_CODEC_NO_KEY, we must reuse the |input_buf_index_|.
// Otherwise MediaDrm will report errors.
if (status == MEDIA_CODEC_NO_KEY)
input_buf_index_ = input_buf_index;
return status;
}
bool MediaDecoderJob::HasData() const {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
// When |input_eos_encountered_| is set, |access_units| must not be empty and
// |access_unit_index_| must be pointing to an EOS unit. We'll reuse this
// unit to flush the decoder until we hit output EOS.
DCHECK(!input_eos_encountered_ ||
(received_data_.access_units.size() > 0 &&
access_unit_index_ < received_data_.access_units.size()))
<< " (access_units.size(): " << received_data_.access_units.size()
<< ", access_unit_index_: " << access_unit_index_ << ")";
return access_unit_index_ < received_data_.access_units.size() ||
input_eos_encountered_;
}
void MediaDecoderJob::RequestData(const base::Closure& done_cb) {
DVLOG(1) << __FUNCTION__;
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(on_data_received_cb_.is_null());
DCHECK(!input_eos_encountered_);
TRACE_EVENT_ASYNC_BEGIN0("media", "MediaDecoderJob::RequestData", this);
received_data_ = DemuxerData();
access_unit_index_ = 0;
on_data_received_cb_ = done_cb;
request_data_cb_.Run();
}
void MediaDecoderJob::DecodeNextAccessUnit(
const base::TimeTicks& start_time_ticks,
const base::TimeDelta& start_presentation_timestamp) {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
DCHECK(!decode_cb_.is_null());
// If the first access unit is a config change, request the player to dequeue
// the input buffer again so that it can request config data.
if (received_data_.access_units[access_unit_index_].status ==
DemuxerStream::kConfigChanged) {
ui_task_runner_->PostTask(FROM_HERE,
base::Bind(&MediaDecoderJob::OnDecodeCompleted,
base::Unretained(this),
MEDIA_CODEC_DEQUEUE_INPUT_AGAIN_LATER,
kNoTimestamp(),
0));
return;
}
decoder_task_runner_->PostTask(FROM_HERE, base::Bind(
&MediaDecoderJob::DecodeInternal, base::Unretained(this),
received_data_.access_units[access_unit_index_],
start_time_ticks, start_presentation_timestamp, needs_flush_,
media::BindToLoop(ui_task_runner_, base::Bind(
&MediaDecoderJob::OnDecodeCompleted, base::Unretained(this)))));
needs_flush_ = false;
}
void MediaDecoderJob::DecodeInternal(
const AccessUnit& unit,
const base::TimeTicks& start_time_ticks,
const base::TimeDelta& start_presentation_timestamp,
bool needs_flush,
const MediaDecoderJob::DecoderCallback& callback) {
DVLOG(1) << __FUNCTION__;
DCHECK(decoder_task_runner_->BelongsToCurrentThread());
TRACE_EVENT0("media", __FUNCTION__);
if (needs_flush) {
DVLOG(1) << "DecodeInternal needs flush.";
input_eos_encountered_ = false;
output_eos_encountered_ = false;
MediaCodecStatus reset_status = media_codec_bridge_->Reset();
if (MEDIA_CODEC_OK != reset_status) {
callback.Run(reset_status, kNoTimestamp(), 0);
return;
}
}
// Once output EOS has occurred, we should not be asked to decode again.
// MediaCodec has undefined behavior if similarly asked to decode after output
// EOS.
DCHECK(!output_eos_encountered_);
// For aborted access unit, just skip it and inform the player.
if (unit.status == DemuxerStream::kAborted) {
// TODO(qinmin): use a new enum instead of MEDIA_CODEC_STOPPED.
callback.Run(MEDIA_CODEC_STOPPED, kNoTimestamp(), 0);
return;
}
if (skip_eos_enqueue_) {
if (unit.end_of_stream || unit.data.empty()) {
input_eos_encountered_ = true;
output_eos_encountered_ = true;
callback.Run(MEDIA_CODEC_OUTPUT_END_OF_STREAM, kNoTimestamp(), 0);
return;
}
skip_eos_enqueue_ = false;
}
MediaCodecStatus input_status = MEDIA_CODEC_INPUT_END_OF_STREAM;
if (!input_eos_encountered_) {
input_status = QueueInputBuffer(unit);
if (input_status == MEDIA_CODEC_INPUT_END_OF_STREAM) {
input_eos_encountered_ = true;
} else if (input_status != MEDIA_CODEC_OK) {
callback.Run(input_status, kNoTimestamp(), 0);
return;
}
}
int buffer_index = 0;
size_t offset = 0;
size_t size = 0;
base::TimeDelta presentation_timestamp;
base::TimeDelta timeout = base::TimeDelta::FromMilliseconds(
kMediaCodecTimeoutInMilliseconds);
MediaCodecStatus status =
media_codec_bridge_->DequeueOutputBuffer(timeout,
&buffer_index,
&offset,
&size,
&presentation_timestamp,
&output_eos_encountered_,
NULL);
if (status != MEDIA_CODEC_OK) {
if (status == MEDIA_CODEC_OUTPUT_BUFFERS_CHANGED &&
!media_codec_bridge_->GetOutputBuffers()) {
status = MEDIA_CODEC_ERROR;
}
callback.Run(status, kNoTimestamp(), 0);
return;
}
// TODO(xhwang/qinmin): This logic is correct but strange. Clean it up.
if (output_eos_encountered_)
status = MEDIA_CODEC_OUTPUT_END_OF_STREAM;
else if (input_status == MEDIA_CODEC_INPUT_END_OF_STREAM)
status = MEDIA_CODEC_INPUT_END_OF_STREAM;
// Check whether we need to render the output.
// TODO(qinmin): comparing most recently queued input's |unit.timestamp| with
// |preroll_timestamp_| is not accurate due to data reordering and possible
// input queueing without immediate dequeue when |input_status| !=
// |MEDIA_CODEC_OK|. Need to use the |presentation_timestamp| for video, and
// use |size| to calculate the timestamp for audio. See
// http://crbug.com/310823 and http://b/11356652.
bool render_output = unit.timestamp >= preroll_timestamp_ &&
(status != MEDIA_CODEC_OUTPUT_END_OF_STREAM || size != 0u);
base::TimeDelta time_to_render;
DCHECK(!start_time_ticks.is_null());
if (render_output && ComputeTimeToRender()) {
time_to_render = presentation_timestamp - (base::TimeTicks::Now() -
start_time_ticks + start_presentation_timestamp);
}
if (time_to_render > base::TimeDelta()) {
decoder_task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(&MediaDecoderJob::ReleaseOutputBuffer,
weak_this_.GetWeakPtr(), buffer_index, size, render_output,
base::Bind(callback, status, presentation_timestamp)),
time_to_render);
return;
}
// TODO(qinmin): The codec is lagging behind, need to recalculate the
// |start_presentation_timestamp_| and |start_time_ticks_| in
// media_source_player.cc.
DVLOG(1) << "codec is lagging behind :" << time_to_render.InMicroseconds();
if (render_output) {
// The player won't expect a timestamp smaller than the
// |start_presentation_timestamp|. However, this could happen due to decoder
// errors.
presentation_timestamp = std::max(
presentation_timestamp, start_presentation_timestamp);
} else {
presentation_timestamp = kNoTimestamp();
}
ReleaseOutputCompletionCallback completion_callback = base::Bind(
callback, status, presentation_timestamp);
ReleaseOutputBuffer(buffer_index, size, render_output, completion_callback);
}
void MediaDecoderJob::OnDecodeCompleted(
MediaCodecStatus status, const base::TimeDelta& presentation_timestamp,
size_t audio_output_bytes) {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
if (destroy_pending_) {
DVLOG(1) << __FUNCTION__ << " : completing pending deletion";
delete this;
return;
}
DCHECK(!decode_cb_.is_null());
// If output was queued for rendering, then we have completed prerolling.
if (presentation_timestamp != kNoTimestamp())
prerolling_ = false;
switch (status) {
case MEDIA_CODEC_OK:
case MEDIA_CODEC_DEQUEUE_OUTPUT_AGAIN_LATER:
case MEDIA_CODEC_OUTPUT_BUFFERS_CHANGED:
case MEDIA_CODEC_OUTPUT_FORMAT_CHANGED:
case MEDIA_CODEC_OUTPUT_END_OF_STREAM:
if (!input_eos_encountered_)
access_unit_index_++;
break;
case MEDIA_CODEC_DEQUEUE_INPUT_AGAIN_LATER:
case MEDIA_CODEC_INPUT_END_OF_STREAM:
case MEDIA_CODEC_NO_KEY:
case MEDIA_CODEC_STOPPED:
case MEDIA_CODEC_ERROR:
// Do nothing.
break;
};
stop_decode_pending_ = false;
base::ResetAndReturn(&decode_cb_).Run(status, presentation_timestamp,
audio_output_bytes);
}
} // namespace media
|