MediaFormat
Overview
The MediaFormat class allows you to select the Codec and Container when recording and when doing audio conversions.
Both Android and iOS are able to automatically detect the format of an audio file when doing playback. You simply have make certain that your audio file is encoded using one of the supported MediaFormats.
If you need to do audio conversions the sounds_codec project (a work in progress) is intended to provide conversions between MediaFormats.
The NativeMediaFormat serves as a base class for each of the well know MediaFormats which includes:
AdtsAacMediaFormat
CafOpusMediaFormat
MP3MediaFormat
OggOpusMediaFormat
OggVorbisMediaFormat
PCMMediaFormat
Before attempting to user a native MediaFormat you need to check that it is supported on the current OS/SDK version.
You can do this by calling the isNativeEncoder (for recording) and isNativeDecoder (for playback).
The media format AdtsAacMediaFormat is the safest as it is supported on both iOS and Android going back to fairly early versions of both OSs.
Sounds defines a set of WellKnowMediaFormats which collectively make up the full set of MediaFormats which are currently supported by at least one of the platforms.
MediaFormat compatibility
The following codecs are supported by sounds:
ADTS/AAC
Ogg/Opus
Caf/Opus
MP3
OGG/Vorbis
PCM
iOS recording
Yes
Yes
Yes
No
No
Yes
iOS playback
Yes
Yes
Yes
Yes
No
Yes
Android recording
Yes
No
No
No
No
No
Android playback
Yes
Yes
No
Yes
Yes
Yes
Note: what MediaFormat is actually supported on the running OS is often SDK dependent. Use MediaFormat.isNativeEncoder and MediaFormat.isNativeDecoder to confirm support.
This table will be updated as MediaFormats are added.
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