The basic idea in this patch is to create an MediaDecoderOwner
interface which nsHTMLMediaElement would implement, and put everything
needed by nsMediaDeocder on that interface. In addition to that,
there are a number of other cleanup patches which enables us to
eliminate many of the nsHTMLMediaElement.h #includes in the media code.
This patch simply moves the MetadataTags typedef to nsMediaDecoder.h to
reduce the dependencies on nsHTMLMediaElements.h. The rest of the
changes are made to make this compile.
Moves to a new setup where a decoder manages a single SourceMediaStream internally. Each stream
returned from mozCaptureStream(UntilEnded) is a TrackUnionStream which is fed by the
decoder's SourceMediaStream.
We want the captured streams to be blocked while the media element is not playing. We do that
by blocking any captured stream that has no SourceMediaStream feeding into it, and blocking
any SourceMediaStream while its decoder is not playing.
We arrange for the decoders's PlaybackEnded to be delayed until its SourceMediaStream has
finished according to the media stream graph. This ensures the state of captured media streams
corresponds more closely to the media element state.
--HG--
extra : rebase_source : 3324ff0e9bdce9c71a23c0f5f2032815e9046081
Moves to a new setup where a decoder manages a single SourceMediaStream internally. Each stream
returned from mozCaptureStream(UntilEnded) is a TrackUnionStream which is fed by the
decoder's SourceMediaStream.
We want the captured streams to be blocked while the media element is not playing. We do that
by blocking any captured stream that has no SourceMediaStream feeding into it, and blocking
any SourceMediaStream while its decoder is not playing.
We arrange for the decoders's PlaybackEnded to be delayed until its SourceMediaStream has
finished according to the media stream graph. This ensures the state of captured media streams
corresponds more closely to the media element state.
--HG--
extra : rebase_source : a301714fad57a3b7c963530a3da99c54bc8ac436
Implements a media.mozGetMetadata() method returning a new javascript object whose properties are key value pairs respresenting metadata tags from the media resource. This data is available after readystate enters METADATA_LOADED.
Currently this is only implemented for Ogg Vorbis streams.
Media format metadata is parsed out by the media decoders. In the nsCodecStateMachine::ReadMetadata subclasses we fill in an nsDataHashtable pointer using the format-specifc api.
The hash pointer is passed up to the media element as part of the MetadataLoaded event.
The hash is deleted if the load is aborted. The audio metadata is also reset to zero (as in the constructor), resolving a todo comment.
For media resources whose streams are captured before the load has started, we shouldn't even start
an audio thread. This saves a lot of resources and ensures we don't see races between the audio thread
and the code that copies packets from the audio queue to the MediaStreams.
This is currently not fully functional. The MediaStream always ends when the underlying resource ends. You can't use these APIs on a media element
whose src is a MediaStream. Seeking or pausing the resource will cause problems. The media element does not play back in sync with the MediaStream.
