void MediaSource::removeSourceBuffer(SourceBuffer& buffer, ExceptionCode& ec)
{
LOG(MediaSource, "MediaSource::removeSourceBuffer() %p", this);
Ref<SourceBuffer> protect(buffer);
// 2. If sourceBuffer specifies an object that is not in sourceBuffers then
// throw a NOT_FOUND_ERR exception and abort these steps.
if (!m_sourceBuffers->length() || !m_sourceBuffers->contains(buffer)) {
ec = NOT_FOUND_ERR;
return;
}
// 3. If the sourceBuffer.updating attribute equals true, then run the following steps: ...
buffer.abortIfUpdating();
// 4. Let SourceBuffer audioTracks list equal the AudioTrackList object returned by sourceBuffer.audioTracks.
RefPtr<AudioTrackList> audioTracks = buffer.audioTracks();
// 5. If the SourceBuffer audioTracks list is not empty, then run the following steps:
if (audioTracks->length()) {
// 5.1 Let HTMLMediaElement audioTracks list equal the AudioTrackList object returned by the audioTracks
// attribute on the HTMLMediaElement.
// 5.2 Let the removed enabled audio track flag equal false.
bool removedEnabledAudioTrack = false;
// 5.3 For each AudioTrack object in the SourceBuffer audioTracks list, run the following steps:
while (audioTracks->length()) {
AudioTrack* track = audioTracks->lastItem();
// 5.3.1 Set the sourceBuffer attribute on the AudioTrack object to null.
track->setSourceBuffer(nullptr);
// 5.3.2 If the enabled attribute on the AudioTrack object is true, then set the removed enabled
// audio track flag to true.
if (track->enabled())
removedEnabledAudioTrack = true;
// 5.3.3 Remove the AudioTrack object from the HTMLMediaElement audioTracks list.
// 5.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement audioTracks list.
if (mediaElement())
mediaElement()->removeAudioTrack(track);
// 5.3.5 Remove the AudioTrack object from the SourceBuffer audioTracks list.
// 5.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer audioTracks list.
audioTracks->remove(track);
}
// 5.4 If the removed enabled audio track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement audioTracks list.
if (removedEnabledAudioTrack)
mediaElement()->audioTracks()->scheduleChangeEvent();
}
// 6. Let SourceBuffer videoTracks list equal the VideoTrackList object returned by sourceBuffer.videoTracks.
RefPtr<VideoTrackList> videoTracks = buffer.videoTracks();
// 7. If the SourceBuffer videoTracks list is not empty, then run the following steps:
if (videoTracks->length()) {
// 7.1 Let HTMLMediaElement videoTracks list equal the VideoTrackList object returned by the videoTracks
// attribute on the HTMLMediaElement.
// 7.2 Let the removed selected video track flag equal false.
bool removedSelectedVideoTrack = false;
// 7.3 For each VideoTrack object in the SourceBuffer videoTracks list, run the following steps:
while (videoTracks->length()) {
VideoTrack* track = videoTracks->lastItem();
// 7.3.1 Set the sourceBuffer attribute on the VideoTrack object to null.
track->setSourceBuffer(nullptr);
// 7.3.2 If the selected attribute on the VideoTrack object is true, then set the removed selected
// video track flag to true.
if (track->selected())
removedSelectedVideoTrack = true;
// 7.3.3 Remove the VideoTrack object from the HTMLMediaElement videoTracks list.
// 7.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement videoTracks list.
if (mediaElement())
mediaElement()->removeVideoTrack(track);
// 7.3.5 Remove the VideoTrack object from the SourceBuffer videoTracks list.
// 7.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer videoTracks list.
videoTracks->remove(track);
}
// 7.4 If the removed selected video track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement videoTracks list.
if (removedSelectedVideoTrack)
mediaElement()->videoTracks()->scheduleChangeEvent();
}
// 8. Let SourceBuffer textTracks list equal the TextTrackList object returned by sourceBuffer.textTracks.
RefPtr<TextTrackList> textTracks = buffer.textTracks();
// 9. If the SourceBuffer textTracks list is not empty, then run the following steps:
if (textTracks->length()) {
// 9.1 Let HTMLMediaElement textTracks list equal the TextTrackList object returned by the textTracks
// attribute on the HTMLMediaElement.
// 9.2 Let the removed enabled text track flag equal false.
bool removedEnabledTextTrack = false;
// 9.3 For each TextTrack object in the SourceBuffer textTracks list, run the following steps:
while (textTracks->length()) {
TextTrack* track = textTracks->lastItem();
// 9.3.1 Set the sourceBuffer attribute on the TextTrack object to null.
track->setSourceBuffer(nullptr);
// 9.3.2 If the mode attribute on the TextTrack object is set to "showing" or "hidden", then
// set the removed enabled text track flag to true.
if (track->mode() == TextTrack::showingKeyword() || track->mode() == TextTrack::hiddenKeyword())
removedEnabledTextTrack = true;
// 9.3.3 Remove the TextTrack object from the HTMLMediaElement textTracks list.
// 9.3.4 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the HTMLMediaElement textTracks list.
if (mediaElement())
mediaElement()->removeTextTrack(track);
// 9.3.5 Remove the TextTrack object from the SourceBuffer textTracks list.
// 9.3.6 Queue a task to fire a trusted event named removetrack, that does not bubble and is not
// cancelable, and that uses the TrackEvent interface, at the SourceBuffer textTracks list.
textTracks->remove(track);
}
// 9.4 If the removed enabled text track flag equals true, then queue a task to fire a simple event
// named change at the HTMLMediaElement textTracks list.
if (removedEnabledTextTrack)
mediaElement()->textTracks()->scheduleChangeEvent();
}
// 10. If sourceBuffer is in activeSourceBuffers, then remove sourceBuffer from activeSourceBuffers ...
m_activeSourceBuffers->remove(buffer);
// 11. Remove sourceBuffer from sourceBuffers and fire a removesourcebuffer event
// on that object.
m_sourceBuffers->remove(buffer);
// 12. Destroy all resources for sourceBuffer.
buffer.removedFromMediaSource();
}
