This repository contains an application that demonstrates different approaches for audio and video playback with the Android MediaCodec API.
Each Activity implements a different solution, either using the Android MediaExtractor component or Steinwurf's petro library to extract AAC and H264 samples from a local mp4 file.
- MainActivity: A frontend for choosing a media file and the actual playback Activity.
- VideoExtractorActivity: The video samples are extracted with the Android MediaExtractor and played with a MediaCodec decoder.
- VideoActivity: The H264 video samples are extracted with the petro library and played with a MediaCodec decoder.
- AudioExtractorActivity: The audio samples are extracted with the Android MediaExtractor and played with a MediaCodec decoder and an AudioTrack object.
- AudioActivity: The AAC video samples are extracted with the petro library and played with a MediaCodec decoder and an AudioTrack object.
- BothActivity: A combination of VideoActivity and AudioActivity, where the petro library is used to extract H264 and AAC samples in parallel. Two separate decoders are used to play the video and audio.
This demo application extracts sample data from a local file, but the same data can be received from a network source. Therefore the code can be used as a basis for a streaming application.
First, the native C++ library (
libpetro_android.so) should be configured
and built with waf. This should be done outside Android Studio.
See our detailed description for configuring and using the Android SDK and the standalone toolchain: http://docs.steinwurf.com/cross_compile.html#android
If you already set up your
PATH to point the SDK and toolchain binaries,
then you can configure this project with a simple command:
python waf configure --cxx_mkspec=cxx_android_gxx49_armv7
After the configure step, you can build the C++ library:
python waf build
If the compilation with waf is successful, then you can open the project in Android Studio and you can build and deploy it like a normal Android application.
Note that the
app/build.gradle file contains a pre-build step that will run
python waf build before each build within Android Studio to make sure that
the native library is always up-to-date.
If you clean (or rebuild) the project in Android Studio, then you have to repeat the waf configure step, because the build folder is removed when the project is cleaned.