Deliver change notifications to SourceBuffer track lists.

third_party/WebKit/Source/modules/mediasource/SourceBuffer.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 651 matching lines @@
 
 bool SourceBuffer::initializationSegmentReceived(const WebVector<MediaTrackInfo>& newTracks)
 {
     BLINK_SBLOG << __func__ << " this=" << this << " tracks=" << newTracks.size();
     DCHECK(m_source);
     DCHECK(m_source->mediaElement());
     DCHECK(m_updating);
 
     if (!RuntimeEnabledFeatures::audioVideoTracksEnabled()) {
         if (!m_firstInitializationSegmentReceived) {
-            m_source->setSourceBufferActive(this);
+            m_source->setSourceBufferActive(this, true);
             m_firstInitializationSegmentReceived = true;
         }
         return true;
     }
 
     // Implementation of Initialization Segment Received, see
     // https://w3c.github.io/media-source/#sourcebuffer-init-segment-received
 
     // Sort newTracks into audio and video tracks to facilitate implementation
     // of subsequent steps of this algorithm.
@@ skipping 74 matching lines @@
         }
 
         // 3.2 Add the appropriate track descriptions from this initialization segment to each of the track buffers.
         // This is done in Chromium code in stream parsers and demuxer implementations.
 
         // 3.3 Set the need random access point flag on all track buffers to true.
         // This is done in Chromium code, see MediaSourceState::OnNewConfigs.
     }
 
     // 4. Let active track flag equal false.
-    m_activeTrack = false;
+    bool activeTrack = false;
 
     // 5. If the first initialization segment received flag is false, then run the following steps:
     if (!m_firstInitializationSegmentReceived) {
         // 5.1 If the initialization segment contains tracks with codecs the user agent does not support, then run the append error algorithm with the decode error parameter set to true and abort these steps.
         // This is done in Chromium code, see MediaSourceState::OnNewConfigs.
 
         // 5.2 For each audio track in the initialization segment, run following steps:
         for (const MediaTrackInfo& trackInfo : newAudioTracks) {
             // 5.2.1 Let audio byte stream track ID be the Track ID for the current track being processed.
             const auto& byteStreamTrackID = trackInfo.byteStreamTrackID;
@@ skipping 13 matching lines @@
             const auto& kind = trackInfo.kind;
             // 5.2.7 TODO(servolk): Implement track kind processing.
             // 5.2.8.2 Let new audio track be a new AudioTrack object.
             AudioTrack* audioTrack = AudioTrack::create(trackInfo.id, kind, label, language, false);
             SourceBufferTrackBaseSupplement::setSourceBuffer(*audioTrack, this);
             // 5.2.8.7 If audioTracks.length equals 0, then run the following steps:
             if (audioTracks().length() == 0) {
                 // 5.2.8.7.1 Set the enabled property on new audio track to true.
                 audioTrack->setEnabled(true);
                 // 5.2.8.7.2 Set active track flag to true.
-                m_activeTrack = true;
+                activeTrack = true;
             }
             // 5.2.8.8 Add new audio track to the audioTracks attribute on this SourceBuffer object.
             // 5.2.8.9 Queue a task to fire a trusted event named addtrack, that does not bubble and is not cancelable, and that uses the TrackEvent interface, at the AudioTrackList object referenced by the audioTracks attribute on this SourceBuffer object.
             audioTracks().add(audioTrack);
             // 5.2.8.10 Add new audio track to the audioTracks attribute on the HTMLMediaElement.
             // 5.2.8.11 Queue a task to fire a trusted event named addtrack, that does not bubble and is not cancelable, and that uses the TrackEvent interface, at the AudioTrackList object referenced by the audioTracks attribute on the HTMLMediaElement.
             m_source->mediaElement()->audioTracks().add(audioTrack);
         }
 
         // 5.3. For each video track in the initialization segment, run following steps:
@@ skipping 16 matching lines @@
             const auto& kind = trackInfo.kind;
             // 5.3.7 TODO(servolk): Implement track kind processing.
             // 5.3.8.2 Let new video track be a new VideoTrack object.
             VideoTrack* videoTrack = VideoTrack::create(trackInfo.id, kind, label, language, false);
             SourceBufferTrackBaseSupplement::setSourceBuffer(*videoTrack, this);
             // 5.3.8.7 If videoTracks.length equals 0, then run the following steps:
             if (videoTracks().length() == 0) {
                 // 5.3.8.7.1 Set the selected property on new audio track to true.
                 videoTrack->setSelected(true);
                 // 5.3.8.7.2 Set active track flag to true.
-                m_activeTrack = true;
+                activeTrack = true;
             }
             // 5.3.8.8 Add new video track to the videoTracks attribute on this SourceBuffer object.
             // 5.3.8.9 Queue a task to fire a trusted event named addtrack, that does not bubble and is not cancelable, and that uses the TrackEvent interface, at the VideoTrackList object referenced by the videoTracks attribute on this SourceBuffer object.
             videoTracks().add(videoTrack);
             // 5.3.8.10 Add new video track to the videoTracks attribute on the HTMLMediaElement.
             // 5.3.8.11 Queue a task to fire a trusted event named addtrack, that does not bubble and is not cancelable, and that uses the TrackEvent interface, at the VideoTrackList object referenced by the videoTracks attribute on the HTMLMediaElement.
             m_source->mediaElement()->videoTracks().add(videoTrack);
         }
 
         // 5.4 TODO(servolk): Add text track processing here.
 
         // 5.5 If active track flag equals true, then run the following steps:
         // activesourcebuffers.
-        if (m_activeTrack) {
+        if (activeTrack) {
             // 5.5.1 Add this SourceBuffer to activeSourceBuffers.
             // 5.5.2 Queue a task to fire a simple event named addsourcebuffer at activeSourceBuffers
-            m_source->setSourceBufferActive(this);
+            m_source->setSourceBufferActive(this, true);
         }
 
         // 5.6. Set first initialization segment received flag to true.
         m_firstInitializationSegmentReceived = true;
     }
 
     return true;
 }
 
 bool SourceBuffer::hasPendingActivity() const
@@ skipping 394 matching lines @@
     visitor->trace(m_removeAsyncPartRunner);
     visitor->trace(m_appendStreamAsyncPartRunner);
     visitor->trace(m_stream);
     visitor->trace(m_audioTracks);
     visitor->trace(m_videoTracks);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink