Android AudioTrack在某些设备上极慢

Question

I have a system decoding MP3 audio with MediaExtractor , converting it with MediaCodec and playing it with AudioTrack . On most devices it works fine, but on the Samsung Galaxy S3 and Samsung Galaxy Tab, some users report extremely slow audio playback. I can't reproduce it on an emulator or physical devices.

Answer 1

After much trouble, it turns out that the issue was with my use of MediaFormat . On some devices, the MediaFormat returned by MediaCodec is not the same as the one returned by MediaExtractor . Frame rates, etc., may change. Instead of instantiating AudioTrack with the MediaFormat returned by MediaExtractor, it was necessary to wait until decoding began. At that point, MediaCodec.dequeueOutputBuffer() will return MediaCodec.INFO_OUTPUT_FORMAT_CHANGED . MediaCodec.getOutputFormat() can then be used return the correct MediaFormat with which to initialize the AudioTrack. Hope this helps someone.