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Android BasicMediaDecoder Sample | ||
=================================== | ||
================================ | ||
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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. | ||
This repo has been migrated to [github.com/android/media-samples][1]. Please check that repo for future updates. Thank you! | ||
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Introduction | ||
------------ | ||
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[MediaCodec][1] was introduced in API 16, and can be used for low level (decoding/encoding) operations. | ||
In the same API was also introduced [TimeAnimator][2], which can be used to synchronise animation frames. | ||
Finally, [MediaExtractor][3] provides a simple way to extract demuxed media data from a data source. | ||
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The main steps are described below: | ||
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1. Create a layout with a [TextureView][4] for your activity. | ||
2. Initialise a MediaExtractor instance with `new MediaExtractor()` and a TimeAnimator instance with | ||
`new TimeAnimator()`. | ||
3. To start video playback, call `setDataSource(this, videoUri, null)` on your MediaExtractor instance, | ||
where `videoUri` is the URI of your video source. | ||
4. On your MediaExtractor instance, call `getTrackCount()` to know how many tracks you have in your streams. | ||
They may not all be video tracks. Deselect all tracks by calling `unselectTrack(i)` where `i` is | ||
the index of the track. | ||
5. Get the mime type of a track by calling `getTrackFormat(i).getString(MediaFormat.KEY_MIME)` | ||
on your MediaExtractor instance, where `i` is 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. | ||
6. Create a MediaCodec instance by calling `MediaCodec.createDecoderByType(mimeType)`. | ||
7. Configure your MediaCodec instance with `configure(trackFormat, textureView, null, 0)`, | ||
where `trackFormat` is obtained by calling `getTrackFormat(i)` on your MediaExtractor instance. | ||
8. Set a TimeListener on your TimeAnimation instance, and override its `onTimeUpdate(final TimeAnimator animation, | ||
final long totalTime, final long deltaTime)` method. | ||
9. In `onTimeUpdate`, check if the media track has reached the end of stream, using `getSampleFlags()` | ||
on your MediaExtractor instance and looking for `MediaCodec.BUFFER_FLAG_END_OF_STREAM` flag. | ||
10. Still in `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][1] documentation for details. | ||
11. After writing the media sample, you need to advance the sample, calling `advance()` on your | ||
TimeExtractor instance (this is a blocking operation and should be done outside the main thread). | ||
12. Finally, you can release and render the media sample by calling | ||
`dequeueOutputBuffer(info, timeout)` and `releaseOutputBuffer(i, true)`, refer to [MediaCodec][1] | ||
documentation for details. | ||
13. In `onPause()` or if you have reached the end of the stream, call `end()` on your TimeAnimation instance, | ||
then call `stop()` and `release()` on your MediaCodec instance, and finally, call `release()` on your | ||
MediaExtractor instance. | ||
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[1]: http://developer.android.com/reference/android/media/MediaCodec.html | ||
[2]: http://developer.android.com/reference/android/animation/TimeAnimator.html | ||
[3]: http://developer.android.com/reference/android/media/MediaExtractor.html | ||
[4]: http://developer.android.com/reference/android/view/TextureView.html | ||
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Pre-requisites | ||
-------------- | ||
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- Android SDK 27 | ||
- Android Build Tools v27.0.2 | ||
- Android Support Repository | ||
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Screenshots | ||
------------- | ||
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<img src="screenshots/1-launch.png" height="400" alt="Screenshot"/> <img src="screenshots/2-play-video.png" height="400" alt="Screenshot"/> | ||
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Getting Started | ||
--------------- | ||
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This sample uses the Gradle build system. To build this project, use the | ||
"gradlew build" command or use "Import Project" in Android Studio. | ||
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Support | ||
------- | ||
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- Google+ Community: https://plus.google.com/communities/105153134372062985968 | ||
- Stack Overflow: http://stackoverflow.com/questions/tagged/android | ||
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If you've found an error in this sample, please file an issue: | ||
https://github.com/googlesamples/android-BasicMediaDecoder | ||
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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. | ||
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License | ||
------- | ||
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Copyright 2017 The Android Open Source Project, Inc. | ||
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Licensed to the Apache Software Foundation (ASF) under one or more contributor | ||
license agreements. See the NOTICE file distributed with this work for | ||
additional information regarding copyright ownership. The ASF licenses this | ||
file to you under the Apache License, Version 2.0 (the "License"); you may not | ||
use this file except in compliance with the License. You may obtain a copy of | ||
the License at | ||
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http://www.apache.org/licenses/LICENSE-2.0 | ||
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Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
License for the specific language governing permissions and limitations under | ||
the License. | ||
[1]: https://github.com/android/media-samples |