This sample shows how to use the MediaCoder to decode a video, use a TimeAnimator to sync the rendering commands with the system display frame rendering and finally render it to a TextureView.
MediaCodec was introduced in API 16, and can be used for low level (decoding/encoding) operations. In the same API was also introduced TimeAnimator, which can be used to synchronise animation frames. Finally, MediaExtractor provides a simple way to extract demuxed media data from a data source.
The main steps are described below:
new MediaExtractor()and a TimeAnimator instance with
setDataSource(this, videoUri, null)on your MediaExtractor instance, where
videoUriis the URI of your video source.
getTrackCount()to know how many tracks you have in your streams. They may not all be video tracks. Deselect all tracks by calling
iis the index of the track.
getTrackFormat(i).getString(MediaFormat.KEY_MIME)on your MediaExtractor instance, where
iis the index of your selected track. If the mime type contains “video/”, then this is a video track so you can select it, using
selectTrack(i)on your MediaExtractor instance.
configure(trackFormat, textureView, null, 0), where
trackFormatis obtained by calling
getTrackFormat(i)on your MediaExtractor instance.
onTimeUpdate(final TimeAnimator animation, final long totalTime, final long deltaTime)method.
onTimeUpdate, check if the media track has reached the end of stream, using
getSampleFlags()on your MediaExtractor instance and looking for
onTimeUpdate, assuming this isn't the end of the sample, write the media sample to your MediaDecoder instance, using
queueInputBuffer(index, 0, size, presentationTimeUs, flags)method. You will need to set up your buffers, refer to MediaCodec documentation for details.
advance()on your TimeExtractor instance (this is a blocking operation and should be done outside the main thread).
releaseOutputBuffer(i, true), refer to MediaCodec documentation for details.
onPause()or if you have reached the end of the stream, call
end()on your TimeAnimation instance, then call
release()on your MediaCodec instance, and finally, call
release()on your MediaExtractor instance.
This sample uses the Gradle build system. To build this project, use the “gradlew build” command or use “Import Project” in Android Studio.
If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-BasicMediaDecoder
Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
Copyright 2019 The Android Open Source Project, Inc.
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