1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "media/base/android/media_source_player.h"
6
7#include <limits>
8
9#include "base/android/jni_android.h"
10#include "base/android/jni_string.h"
11#include "base/barrier_closure.h"
12#include "base/basictypes.h"
13#include "base/bind.h"
14#include "base/callback_helpers.h"
15#include "base/debug/trace_event.h"
16#include "base/logging.h"
17#include "base/strings/string_number_conversions.h"
18#include "media/base/android/audio_decoder_job.h"
19#include "media/base/android/media_drm_bridge.h"
20#include "media/base/android/media_player_manager.h"
21#include "media/base/android/video_decoder_job.h"
22
23
24namespace media {
25
26MediaSourcePlayer::MediaSourcePlayer(
27    int player_id,
28    MediaPlayerManager* manager,
29    const RequestMediaResourcesCB& request_media_resources_cb,
30    scoped_ptr<DemuxerAndroid> demuxer,
31    const GURL& frame_url)
32    : MediaPlayerAndroid(player_id,
33                         manager,
34                         request_media_resources_cb,
35                         frame_url),
36      demuxer_(demuxer.Pass()),
37      pending_event_(NO_EVENT_PENDING),
38      playing_(false),
39      interpolator_(&default_tick_clock_),
40      doing_browser_seek_(false),
41      pending_seek_(false),
42      drm_bridge_(NULL),
43      cdm_registration_id_(0),
44      is_waiting_for_key_(false),
45      is_waiting_for_audio_decoder_(false),
46      is_waiting_for_video_decoder_(false),
47      prerolling_(false),
48      weak_factory_(this) {
49  audio_decoder_job_.reset(new AudioDecoderJob(
50      base::Bind(&DemuxerAndroid::RequestDemuxerData,
51                 base::Unretained(demuxer_.get()),
52                 DemuxerStream::AUDIO),
53      base::Bind(&MediaSourcePlayer::OnDemuxerConfigsChanged,
54                 weak_factory_.GetWeakPtr())));
55  video_decoder_job_.reset(new VideoDecoderJob(
56      base::Bind(&DemuxerAndroid::RequestDemuxerData,
57                 base::Unretained(demuxer_.get()),
58                 DemuxerStream::VIDEO),
59      base::Bind(request_media_resources_cb_, player_id),
60      base::Bind(&MediaSourcePlayer::OnDemuxerConfigsChanged,
61                 weak_factory_.GetWeakPtr())));
62  demuxer_->Initialize(this);
63  interpolator_.SetUpperBound(base::TimeDelta());
64  weak_this_ = weak_factory_.GetWeakPtr();
65}
66
67MediaSourcePlayer::~MediaSourcePlayer() {
68  Release();
69  DCHECK_EQ(!drm_bridge_, !cdm_registration_id_);
70  if (drm_bridge_) {
71    drm_bridge_->UnregisterPlayer(cdm_registration_id_);
72    cdm_registration_id_ = 0;
73  }
74}
75
76void MediaSourcePlayer::SetVideoSurface(gfx::ScopedJavaSurface surface) {
77  DVLOG(1) << __FUNCTION__;
78  if (!video_decoder_job_->SetVideoSurface(surface.Pass()))
79    return;
80  // Retry video decoder creation.
81  RetryDecoderCreation(false, true);
82}
83
84void MediaSourcePlayer::ScheduleSeekEventAndStopDecoding(
85    base::TimeDelta seek_time) {
86  DVLOG(1) << __FUNCTION__ << "(" << seek_time.InSecondsF() << ")";
87  DCHECK(!IsEventPending(SEEK_EVENT_PENDING));
88
89  pending_seek_ = false;
90
91  interpolator_.SetBounds(seek_time, seek_time);
92
93  if (audio_decoder_job_->is_decoding())
94    audio_decoder_job_->StopDecode();
95  if (video_decoder_job_->is_decoding())
96    video_decoder_job_->StopDecode();
97
98  SetPendingEvent(SEEK_EVENT_PENDING);
99  ProcessPendingEvents();
100}
101
102void MediaSourcePlayer::BrowserSeekToCurrentTime() {
103  DVLOG(1) << __FUNCTION__;
104
105  DCHECK(!IsEventPending(SEEK_EVENT_PENDING));
106  doing_browser_seek_ = true;
107  ScheduleSeekEventAndStopDecoding(GetCurrentTime());
108}
109
110bool MediaSourcePlayer::Seekable() {
111  // If the duration TimeDelta, converted to milliseconds from microseconds,
112  // is >= 2^31, then the media is assumed to be unbounded and unseekable.
113  // 2^31 is the bound due to java player using 32-bit integer for time
114  // values at millisecond resolution.
115  return duration_ <
116         base::TimeDelta::FromMilliseconds(std::numeric_limits<int32>::max());
117}
118
119void MediaSourcePlayer::Start() {
120  DVLOG(1) << __FUNCTION__;
121
122  playing_ = true;
123
124  bool request_fullscreen = IsProtectedSurfaceRequired();
125#if defined(VIDEO_HOLE)
126  // Skip to request fullscreen when hole-punching is used.
127  request_fullscreen = request_fullscreen &&
128      !manager()->ShouldUseVideoOverlayForEmbeddedEncryptedVideo();
129#endif  // defined(VIDEO_HOLE)
130  if (request_fullscreen)
131    manager()->RequestFullScreen(player_id());
132
133  StartInternal();
134}
135
136void MediaSourcePlayer::Pause(bool is_media_related_action) {
137  DVLOG(1) << __FUNCTION__;
138
139  // Since decoder jobs have their own thread, decoding is not fully paused
140  // until all the decoder jobs call MediaDecoderCallback(). It is possible
141  // that Start() is called while the player is waiting for
142  // MediaDecoderCallback(). In that case, decoding will continue when
143  // MediaDecoderCallback() is called.
144  playing_ = false;
145  start_time_ticks_ = base::TimeTicks();
146}
147
148bool MediaSourcePlayer::IsPlaying() {
149  return playing_;
150}
151
152int MediaSourcePlayer::GetVideoWidth() {
153  return video_decoder_job_->output_width();
154}
155
156int MediaSourcePlayer::GetVideoHeight() {
157  return video_decoder_job_->output_height();
158}
159
160void MediaSourcePlayer::SeekTo(base::TimeDelta timestamp) {
161  DVLOG(1) << __FUNCTION__ << "(" << timestamp.InSecondsF() << ")";
162
163  if (IsEventPending(SEEK_EVENT_PENDING)) {
164    DCHECK(doing_browser_seek_) << "SeekTo while SeekTo in progress";
165    DCHECK(!pending_seek_) << "SeekTo while SeekTo pending browser seek";
166
167    // There is a browser seek currently in progress to obtain I-frame to feed
168    // a newly constructed video decoder. Remember this real seek request so
169    // it can be initiated once OnDemuxerSeekDone() occurs for the browser seek.
170    pending_seek_ = true;
171    pending_seek_time_ = timestamp;
172    return;
173  }
174
175  doing_browser_seek_ = false;
176  ScheduleSeekEventAndStopDecoding(timestamp);
177}
178
179base::TimeDelta MediaSourcePlayer::GetCurrentTime() {
180  return std::min(interpolator_.GetInterpolatedTime(), duration_);
181}
182
183base::TimeDelta MediaSourcePlayer::GetDuration() {
184  return duration_;
185}
186
187void MediaSourcePlayer::Release() {
188  DVLOG(1) << __FUNCTION__;
189
190  audio_decoder_job_->ReleaseDecoderResources();
191  video_decoder_job_->ReleaseDecoderResources();
192
193  // Prevent player restart, including job re-creation attempts.
194  playing_ = false;
195
196  decoder_starvation_callback_.Cancel();
197  DetachListener();
198}
199
200void MediaSourcePlayer::SetVolume(double volume) {
201  audio_decoder_job_->SetVolume(volume);
202}
203
204bool MediaSourcePlayer::CanPause() {
205  return Seekable();
206}
207
208bool MediaSourcePlayer::CanSeekForward() {
209  return Seekable();
210}
211
212bool MediaSourcePlayer::CanSeekBackward() {
213  return Seekable();
214}
215
216bool MediaSourcePlayer::IsPlayerReady() {
217  return audio_decoder_job_ || video_decoder_job_;
218}
219
220void MediaSourcePlayer::StartInternal() {
221  DVLOG(1) << __FUNCTION__;
222  // If there are pending events, wait for them finish.
223  if (pending_event_ != NO_EVENT_PENDING)
224    return;
225
226  // When we start, we'll have new demuxed data coming in. This new data could
227  // be clear (not encrypted) or encrypted with different keys. So
228  // |is_waiting_for_key_| condition may not be true anymore.
229  is_waiting_for_key_ = false;
230  AttachListener(NULL);
231
232  SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
233  ProcessPendingEvents();
234}
235
236void MediaSourcePlayer::OnDemuxerConfigsAvailable(
237    const DemuxerConfigs& configs) {
238  DVLOG(1) << __FUNCTION__;
239  DCHECK(!HasAudio() && !HasVideo());
240  duration_ = configs.duration;
241
242  audio_decoder_job_->SetDemuxerConfigs(configs);
243  video_decoder_job_->SetDemuxerConfigs(configs);
244  OnDemuxerConfigsChanged();
245}
246
247void MediaSourcePlayer::OnDemuxerDataAvailable(const DemuxerData& data) {
248  DVLOG(1) << __FUNCTION__ << "(" << data.type << ")";
249  DCHECK_LT(0u, data.access_units.size());
250  CHECK_GE(1u, data.demuxer_configs.size());
251
252  if (data.type == DemuxerStream::AUDIO)
253    audio_decoder_job_->OnDataReceived(data);
254  else if (data.type == DemuxerStream::VIDEO)
255    video_decoder_job_->OnDataReceived(data);
256}
257
258void MediaSourcePlayer::OnDemuxerDurationChanged(base::TimeDelta duration) {
259  duration_ = duration;
260}
261
262void MediaSourcePlayer::OnMediaCryptoReady() {
263  DCHECK(!drm_bridge_->GetMediaCrypto().is_null());
264  drm_bridge_->SetMediaCryptoReadyCB(base::Closure());
265
266  // Retry decoder creation if the decoders are waiting for MediaCrypto.
267  RetryDecoderCreation(true, true);
268}
269
270void MediaSourcePlayer::SetCdm(BrowserCdm* cdm) {
271  // Currently we don't support DRM change during the middle of playback, even
272  // if the player is paused.
273  // TODO(qinmin): support DRM change after playback has started.
274  // http://crbug.com/253792.
275  if (GetCurrentTime() > base::TimeDelta()) {
276    VLOG(0) << "Setting DRM bridge after playback has started. "
277            << "This is not well supported!";
278  }
279
280  if (drm_bridge_) {
281    NOTREACHED() << "Currently we do not support resetting CDM.";
282    return;
283  }
284
285  // Only MediaDrmBridge will be set on MediaSourcePlayer.
286  drm_bridge_ = static_cast<MediaDrmBridge*>(cdm);
287
288  cdm_registration_id_ = drm_bridge_->RegisterPlayer(
289      base::Bind(&MediaSourcePlayer::OnKeyAdded, weak_this_),
290      base::Bind(&MediaSourcePlayer::OnCdmUnset, weak_this_));
291
292  audio_decoder_job_->SetDrmBridge(drm_bridge_);
293  video_decoder_job_->SetDrmBridge(drm_bridge_);
294
295  if (drm_bridge_->GetMediaCrypto().is_null()) {
296    drm_bridge_->SetMediaCryptoReadyCB(
297        base::Bind(&MediaSourcePlayer::OnMediaCryptoReady, weak_this_));
298    return;
299  }
300
301  // If the player is previously waiting for CDM, retry decoder creation.
302  RetryDecoderCreation(true, true);
303}
304
305void MediaSourcePlayer::OnDemuxerSeekDone(
306    base::TimeDelta actual_browser_seek_time) {
307  DVLOG(1) << __FUNCTION__;
308
309  ClearPendingEvent(SEEK_EVENT_PENDING);
310  if (IsEventPending(PREFETCH_REQUEST_EVENT_PENDING))
311    ClearPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
312
313  if (pending_seek_) {
314    DVLOG(1) << __FUNCTION__ << "processing pending seek";
315    DCHECK(doing_browser_seek_);
316    pending_seek_ = false;
317    SeekTo(pending_seek_time_);
318    return;
319  }
320
321  // It is possible that a browser seek to I-frame had to seek to a buffered
322  // I-frame later than the requested one due to data removal or GC. Update
323  // player clock to the actual seek target.
324  if (doing_browser_seek_) {
325    DCHECK(actual_browser_seek_time != kNoTimestamp());
326    base::TimeDelta seek_time = actual_browser_seek_time;
327    // A browser seek must not jump into the past. Ideally, it seeks to the
328    // requested time, but it might jump into the future.
329    DCHECK(seek_time >= GetCurrentTime());
330    DVLOG(1) << __FUNCTION__ << " : setting clock to actual browser seek time: "
331             << seek_time.InSecondsF();
332    interpolator_.SetBounds(seek_time, seek_time);
333    audio_decoder_job_->SetBaseTimestamp(seek_time);
334  } else {
335    DCHECK(actual_browser_seek_time == kNoTimestamp());
336  }
337
338  base::TimeDelta current_time = GetCurrentTime();
339  // TODO(qinmin): Simplify the logic by using |start_presentation_timestamp_|
340  // to preroll media decoder jobs. Currently |start_presentation_timestamp_|
341  // is calculated from decoder output, while preroll relies on the access
342  // unit's timestamp. There are some differences between the two.
343  preroll_timestamp_ = current_time;
344  if (HasAudio())
345    audio_decoder_job_->BeginPrerolling(preroll_timestamp_);
346  if (HasVideo())
347    video_decoder_job_->BeginPrerolling(preroll_timestamp_);
348  prerolling_ = true;
349
350  if (!doing_browser_seek_)
351    manager()->OnSeekComplete(player_id(), current_time);
352
353  ProcessPendingEvents();
354}
355
356void MediaSourcePlayer::UpdateTimestamps(
357    base::TimeDelta current_presentation_timestamp,
358    base::TimeDelta max_presentation_timestamp) {
359  interpolator_.SetBounds(current_presentation_timestamp,
360                          max_presentation_timestamp);
361  manager()->OnTimeUpdate(player_id(),
362                          GetCurrentTime(),
363                          base::TimeTicks::Now());
364}
365
366void MediaSourcePlayer::ProcessPendingEvents() {
367  DVLOG(1) << __FUNCTION__ << " : 0x" << std::hex << pending_event_;
368  // Wait for all the decoding jobs to finish before processing pending tasks.
369  if (video_decoder_job_->is_decoding()) {
370    DVLOG(1) << __FUNCTION__ << " : A video job is still decoding.";
371    return;
372  }
373
374  if (audio_decoder_job_->is_decoding()) {
375    DVLOG(1) << __FUNCTION__ << " : An audio job is still decoding.";
376    return;
377  }
378
379  if (IsEventPending(PREFETCH_DONE_EVENT_PENDING)) {
380    DVLOG(1) << __FUNCTION__ << " : PREFETCH_DONE still pending.";
381    return;
382  }
383
384  if (IsEventPending(SEEK_EVENT_PENDING)) {
385    DVLOG(1) << __FUNCTION__ << " : Handling SEEK_EVENT";
386    ClearDecodingData();
387    audio_decoder_job_->SetBaseTimestamp(GetCurrentTime());
388    demuxer_->RequestDemuxerSeek(GetCurrentTime(), doing_browser_seek_);
389    return;
390  }
391
392  if (IsEventPending(DECODER_CREATION_EVENT_PENDING)) {
393    // Don't continue if one of the decoder is not created.
394    if (is_waiting_for_audio_decoder_ || is_waiting_for_video_decoder_)
395      return;
396    ClearPendingEvent(DECODER_CREATION_EVENT_PENDING);
397  }
398
399  if (IsEventPending(PREFETCH_REQUEST_EVENT_PENDING)) {
400    DVLOG(1) << __FUNCTION__ << " : Handling PREFETCH_REQUEST_EVENT.";
401    int count = (AudioFinished() ? 0 : 1) + (VideoFinished() ? 0 : 1);
402
403    // It is possible that all streams have finished decode, yet starvation
404    // occurred during the last stream's EOS decode. In this case, prefetch is a
405    // no-op.
406    ClearPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
407    if (count == 0)
408      return;
409
410    SetPendingEvent(PREFETCH_DONE_EVENT_PENDING);
411    base::Closure barrier = BarrierClosure(
412        count, base::Bind(&MediaSourcePlayer::OnPrefetchDone, weak_this_));
413
414    if (!AudioFinished())
415      audio_decoder_job_->Prefetch(barrier);
416
417    if (!VideoFinished())
418      video_decoder_job_->Prefetch(barrier);
419
420    return;
421  }
422
423  DCHECK_EQ(pending_event_, NO_EVENT_PENDING);
424
425  // Now that all pending events have been handled, resume decoding if we are
426  // still playing.
427  if (playing_)
428    StartInternal();
429}
430
431void MediaSourcePlayer::MediaDecoderCallback(
432    bool is_audio, MediaCodecStatus status,
433    base::TimeDelta current_presentation_timestamp,
434    base::TimeDelta max_presentation_timestamp) {
435  DVLOG(1) << __FUNCTION__ << ": " << is_audio << ", " << status;
436
437  // TODO(xhwang): Drop IntToString() when http://crbug.com/303899 is fixed.
438  if (is_audio) {
439    TRACE_EVENT_ASYNC_END1("media",
440                           "MediaSourcePlayer::DecodeMoreAudio",
441                           audio_decoder_job_.get(),
442                           "MediaCodecStatus",
443                           base::IntToString(status));
444  } else {
445    TRACE_EVENT_ASYNC_END1("media",
446                           "MediaSourcePlayer::DecodeMoreVideo",
447                           video_decoder_job_.get(),
448                           "MediaCodecStatus",
449                           base::IntToString(status));
450  }
451
452  // Let tests hook the completion of this decode cycle.
453  if (!decode_callback_for_testing_.is_null())
454    base::ResetAndReturn(&decode_callback_for_testing_).Run();
455
456  bool is_clock_manager = is_audio || !HasAudio();
457
458  if (is_clock_manager)
459    decoder_starvation_callback_.Cancel();
460
461  if (status == MEDIA_CODEC_ERROR) {
462    DVLOG(1) << __FUNCTION__ << " : decode error";
463    Release();
464    manager()->OnError(player_id(), MEDIA_ERROR_DECODE);
465    return;
466  }
467
468  DCHECK(!IsEventPending(PREFETCH_DONE_EVENT_PENDING));
469
470  // Let |SEEK_EVENT_PENDING| (the highest priority event outside of
471  // |PREFETCH_DONE_EVENT_PENDING|) preempt output EOS detection here. Process
472  // any other pending events only after handling EOS detection.
473  if (IsEventPending(SEEK_EVENT_PENDING)) {
474    ProcessPendingEvents();
475    return;
476  }
477
478  if ((status == MEDIA_CODEC_OK || status == MEDIA_CODEC_INPUT_END_OF_STREAM) &&
479      is_clock_manager && current_presentation_timestamp != kNoTimestamp()) {
480    UpdateTimestamps(current_presentation_timestamp,
481                     max_presentation_timestamp);
482  }
483
484  if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM) {
485    PlaybackCompleted(is_audio);
486    if (is_clock_manager)
487      interpolator_.StopInterpolating();
488  }
489
490  if (pending_event_ != NO_EVENT_PENDING) {
491    ProcessPendingEvents();
492    return;
493  }
494
495  if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM)
496    return;
497
498  if (!playing_) {
499    if (is_clock_manager)
500      interpolator_.StopInterpolating();
501    return;
502  }
503
504  if (status == MEDIA_CODEC_NO_KEY) {
505    is_waiting_for_key_ = true;
506    return;
507  }
508
509  // If the status is MEDIA_CODEC_STOPPED, stop decoding new data. The player is
510  // in the middle of a seek or stop event and needs to wait for the IPCs to
511  // come.
512  if (status == MEDIA_CODEC_STOPPED)
513    return;
514
515  if (prerolling_ && IsPrerollFinished(is_audio)) {
516    if (IsPrerollFinished(!is_audio)) {
517      prerolling_ = false;
518      StartInternal();
519    }
520    return;
521  }
522
523  if (is_clock_manager) {
524    // If we have a valid timestamp, start the starvation callback. Otherwise,
525    // reset the |start_time_ticks_| so that the next frame will not suffer
526    // from the decoding delay caused by the current frame.
527    if (current_presentation_timestamp != kNoTimestamp())
528      StartStarvationCallback(current_presentation_timestamp,
529                              max_presentation_timestamp);
530    else
531      start_time_ticks_ = base::TimeTicks::Now();
532  }
533
534  if (is_audio)
535    DecodeMoreAudio();
536  else
537    DecodeMoreVideo();
538}
539
540bool MediaSourcePlayer::IsPrerollFinished(bool is_audio) const {
541  if (is_audio)
542    return !HasAudio() || !audio_decoder_job_->prerolling();
543  return !HasVideo() || !video_decoder_job_->prerolling();
544}
545
546void MediaSourcePlayer::DecodeMoreAudio() {
547  DVLOG(1) << __FUNCTION__;
548  DCHECK(!audio_decoder_job_->is_decoding());
549  DCHECK(!AudioFinished());
550
551  if (audio_decoder_job_->Decode(
552      start_time_ticks_,
553      start_presentation_timestamp_,
554      base::Bind(&MediaSourcePlayer::MediaDecoderCallback, weak_this_, true))) {
555    TRACE_EVENT_ASYNC_BEGIN0("media", "MediaSourcePlayer::DecodeMoreAudio",
556                             audio_decoder_job_.get());
557    return;
558  }
559
560  is_waiting_for_audio_decoder_ = true;
561  if (!IsEventPending(DECODER_CREATION_EVENT_PENDING))
562    SetPendingEvent(DECODER_CREATION_EVENT_PENDING);
563}
564
565void MediaSourcePlayer::DecodeMoreVideo() {
566  DVLOG(1) << __FUNCTION__;
567  DCHECK(!video_decoder_job_->is_decoding());
568  DCHECK(!VideoFinished());
569
570  if (video_decoder_job_->Decode(
571      start_time_ticks_,
572      start_presentation_timestamp_,
573      base::Bind(&MediaSourcePlayer::MediaDecoderCallback, weak_this_,
574                 false))) {
575    TRACE_EVENT_ASYNC_BEGIN0("media", "MediaSourcePlayer::DecodeMoreVideo",
576                             video_decoder_job_.get());
577    return;
578  }
579
580  // If the decoder is waiting for iframe, trigger a browser seek.
581  if (!video_decoder_job_->next_video_data_is_iframe()) {
582    BrowserSeekToCurrentTime();
583    return;
584  }
585
586  is_waiting_for_video_decoder_ = true;
587  if (!IsEventPending(DECODER_CREATION_EVENT_PENDING))
588    SetPendingEvent(DECODER_CREATION_EVENT_PENDING);
589}
590
591void MediaSourcePlayer::PlaybackCompleted(bool is_audio) {
592  DVLOG(1) << __FUNCTION__ << "(" << is_audio << ")";
593
594  if (AudioFinished() && VideoFinished()) {
595    playing_ = false;
596    start_time_ticks_ = base::TimeTicks();
597    manager()->OnPlaybackComplete(player_id());
598  }
599}
600
601void MediaSourcePlayer::ClearDecodingData() {
602  DVLOG(1) << __FUNCTION__;
603  audio_decoder_job_->Flush();
604  video_decoder_job_->Flush();
605  start_time_ticks_ = base::TimeTicks();
606}
607
608bool MediaSourcePlayer::HasVideo() const {
609  return video_decoder_job_->HasStream();
610}
611
612bool MediaSourcePlayer::HasAudio() const {
613  return audio_decoder_job_->HasStream();
614}
615
616bool MediaSourcePlayer::AudioFinished() {
617  return audio_decoder_job_->OutputEOSReached() || !HasAudio();
618}
619
620bool MediaSourcePlayer::VideoFinished() {
621  return video_decoder_job_->OutputEOSReached() || !HasVideo();
622}
623
624void MediaSourcePlayer::OnDecoderStarved() {
625  DVLOG(1) << __FUNCTION__;
626  SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
627  ProcessPendingEvents();
628}
629
630void MediaSourcePlayer::StartStarvationCallback(
631    base::TimeDelta current_presentation_timestamp,
632    base::TimeDelta max_presentation_timestamp) {
633  // 20ms was chosen because it is the typical size of a compressed audio frame.
634  // Anything smaller than this would likely cause unnecessary cycling in and
635  // out of the prefetch state.
636  const base::TimeDelta kMinStarvationTimeout =
637      base::TimeDelta::FromMilliseconds(20);
638
639  base::TimeDelta current_timestamp = GetCurrentTime();
640  base::TimeDelta timeout;
641  if (HasAudio()) {
642    timeout = max_presentation_timestamp - current_timestamp;
643  } else {
644    DCHECK(current_timestamp <= current_presentation_timestamp);
645
646    // For video only streams, fps can be estimated from the difference
647    // between the previous and current presentation timestamps. The
648    // previous presentation timestamp is equal to current_timestamp.
649    // TODO(qinmin): determine whether 2 is a good coefficient for estimating
650    // video frame timeout.
651    timeout = 2 * (current_presentation_timestamp - current_timestamp);
652  }
653
654  timeout = std::max(timeout, kMinStarvationTimeout);
655
656  decoder_starvation_callback_.Reset(
657      base::Bind(&MediaSourcePlayer::OnDecoderStarved, weak_this_));
658  base::MessageLoop::current()->PostDelayedTask(
659      FROM_HERE, decoder_starvation_callback_.callback(), timeout);
660}
661
662bool MediaSourcePlayer::IsProtectedSurfaceRequired() {
663  return video_decoder_job_->is_content_encrypted() &&
664      drm_bridge_ && drm_bridge_->IsProtectedSurfaceRequired();
665}
666
667void MediaSourcePlayer::OnPrefetchDone() {
668  DVLOG(1) << __FUNCTION__;
669  DCHECK(!audio_decoder_job_->is_decoding());
670  DCHECK(!video_decoder_job_->is_decoding());
671
672  // A previously posted OnPrefetchDone() could race against a Release(). If
673  // Release() won the race, we should no longer have decoder jobs.
674  // TODO(qinmin/wolenetz): Maintain channel state to not double-request data
675  // or drop data received across Release()+Start(). See http://crbug.com/306314
676  // and http://crbug.com/304234.
677  if (!IsEventPending(PREFETCH_DONE_EVENT_PENDING)) {
678    DVLOG(1) << __FUNCTION__ << " : aborting";
679    return;
680  }
681
682  ClearPendingEvent(PREFETCH_DONE_EVENT_PENDING);
683
684  if (pending_event_ != NO_EVENT_PENDING) {
685    ProcessPendingEvents();
686    return;
687  }
688
689  if (!playing_)
690    return;
691
692  start_time_ticks_ = base::TimeTicks::Now();
693  start_presentation_timestamp_ = GetCurrentTime();
694  if (!interpolator_.interpolating())
695    interpolator_.StartInterpolating();
696
697  if (!AudioFinished())
698    DecodeMoreAudio();
699
700  if (!VideoFinished())
701    DecodeMoreVideo();
702}
703
704void MediaSourcePlayer::OnDemuxerConfigsChanged() {
705  manager()->OnMediaMetadataChanged(
706      player_id(), duration_, GetVideoWidth(), GetVideoHeight(), true);
707}
708
709const char* MediaSourcePlayer::GetEventName(PendingEventFlags event) {
710  // Please keep this in sync with PendingEventFlags.
711  static const char* kPendingEventNames[] = {
712    "PREFETCH_DONE",
713    "SEEK",
714    "DECODER_CREATION",
715    "PREFETCH_REQUEST",
716  };
717
718  int mask = 1;
719  for (size_t i = 0; i < arraysize(kPendingEventNames); ++i, mask <<= 1) {
720    if (event & mask)
721      return kPendingEventNames[i];
722  }
723
724  return "UNKNOWN";
725}
726
727bool MediaSourcePlayer::IsEventPending(PendingEventFlags event) const {
728  return pending_event_ & event;
729}
730
731void MediaSourcePlayer::SetPendingEvent(PendingEventFlags event) {
732  DVLOG(1) << __FUNCTION__ << "(" << GetEventName(event) << ")";
733  DCHECK_NE(event, NO_EVENT_PENDING);
734  DCHECK(!IsEventPending(event));
735
736  pending_event_ |= event;
737}
738
739void MediaSourcePlayer::ClearPendingEvent(PendingEventFlags event) {
740  DVLOG(1) << __FUNCTION__ << "(" << GetEventName(event) << ")";
741  DCHECK_NE(event, NO_EVENT_PENDING);
742  DCHECK(IsEventPending(event)) << GetEventName(event);
743
744  pending_event_ &= ~event;
745}
746
747void MediaSourcePlayer::RetryDecoderCreation(bool audio, bool video) {
748  if (audio)
749    is_waiting_for_audio_decoder_ = false;
750  if (video)
751    is_waiting_for_video_decoder_ = false;
752  if (IsEventPending(DECODER_CREATION_EVENT_PENDING))
753    ProcessPendingEvents();
754}
755
756void MediaSourcePlayer::OnKeyAdded() {
757  DVLOG(1) << __FUNCTION__;
758  if (!is_waiting_for_key_)
759    return;
760
761  is_waiting_for_key_ = false;
762  if (playing_)
763    StartInternal();
764}
765
766void MediaSourcePlayer::OnCdmUnset() {
767  DVLOG(1) << __FUNCTION__;
768  DCHECK(drm_bridge_);
769  // TODO(xhwang): Currently this is only called during teardown. Support full
770  // detachment of CDM during playback. This will be needed when we start to
771  // support setMediaKeys(0) (see http://crbug.com/330324), or when we release
772  // MediaDrm when the video is paused, or when the device goes to sleep (see
773  // http://crbug.com/272421).
774  audio_decoder_job_->SetDrmBridge(NULL);
775  video_decoder_job_->SetDrmBridge(NULL);
776  cdm_registration_id_ = 0;
777  drm_bridge_ = NULL;
778}
779
780}  // namespace media
781