Determine the audible state in MediaSourcePlayer

media/base/android/media_source_player.cc

Index: media/base/android/media_source_player.cc
diff --git a/media/base/android/media_source_player.cc b/media/base/android/media_source_player.cc
index 85ffd545d87877f787ca8d3a13fc55c1408460bd..3dae525f29d947c69695fdb2b87a90592a2697f0 100644
--- a/media/base/android/media_source_player.cc
+++ b/media/base/android/media_source_player.cc
@@ -194,6 +194,8 @@ void MediaSourcePlayer::Release() {
   playing_ = false;
 
   decoder_starvation_callback_.Cancel();
+
+  SetAudible(false);
   DetachListener();
 }
 
@@ -238,6 +240,7 @@ void MediaSourcePlayer::OnDemuxerConfigsAvailable(
     const DemuxerConfigs& configs) {
   DVLOG(1) << __FUNCTION__;
   DCHECK(!HasAudio() && !HasVideo());
+
   duration_ = configs.duration;
 
   audio_decoder_job_->SetDemuxerConfigs(configs);
@@ -399,6 +402,7 @@ void MediaSourcePlayer::ProcessPendingEvents() {
 
   if (IsEventPending(PREFETCH_REQUEST_EVENT_PENDING)) {
     DVLOG(1) << __FUNCTION__ << " : Handling PREFETCH_REQUEST_EVENT.";
+
     int count = (AudioFinished() ? 0 : 1) + (VideoFinished() ? 0 : 1);
 
     // It is possible that all streams have finished decode, yet starvation
@@ -493,12 +497,18 @@ void MediaSourcePlayer::MediaDecoderCallback(
     return;
   }
 
-  if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM)
+  if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM) {
+    if (is_audio)
+      SetAudible(false);
     return;
+  }
 
   if (!playing_) {
     if (is_clock_manager)
       interpolator_.StopInterpolating();
+
+    if (is_audio)
+      SetAudible(false);
     return;
   }
 
@@ -507,6 +517,9 @@ void MediaSourcePlayer::MediaDecoderCallback(
       DVLOG(2) << __FUNCTION__ << ": Key was added during decoding.";
       ResumePlaybackAfterKeyAdded();
     } else {
+      if (is_audio)
+        SetAudible(false);
+
       is_waiting_for_key_ = true;
       manager()->OnWaitingForDecryptionKey(player_id());
     }
@@ -526,8 +539,11 @@ void MediaSourcePlayer::MediaDecoderCallback(
   // If the status is MEDIA_CODEC_ABORT, stop decoding new data. The player is
   // in the middle of a seek or stop event and needs to wait for the IPCs to
   // come.
-  if (status == MEDIA_CODEC_ABORT)
+  if (status == MEDIA_CODEC_ABORT) {
+    if (is_audio)
+      SetAudible(false);
     return;
+  }
 
   if (prerolling_ && IsPrerollFinished(is_audio)) {
     if (IsPrerollFinished(!is_audio)) {
@@ -537,6 +553,13 @@ void MediaSourcePlayer::MediaDecoderCallback(
     return;
   }
 
+  // We successfully decoded a frame and going to the next one.
+  // Set the audible state.
+  if (is_audio) {
+    bool is_audible = !prerolling_ && audio_decoder_job_->volume() > 0;
+    SetAudible(is_audible);
+  }
+
   if (is_clock_manager) {
     // If we have a valid timestamp, start the starvation callback. Otherwise,
     // reset the |start_time_ticks_| so that the next frame will not suffer
@@ -648,6 +671,14 @@ bool MediaSourcePlayer::VideoFinished() {
 
 void MediaSourcePlayer::OnDecoderStarved() {
   DVLOG(1) << __FUNCTION__;
+
+  if (HasAudio()) {
+    // If the starvation timer fired but there are no encoded frames
+    // in the queue we believe the demuxer (i.e. renderer process) froze.
+    if (!audio_decoder_job_->HasData())
+      SetAudible(false);
+  }
+
   SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
   ProcessPendingEvents();
 }