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