Add MediaCodecAudioDecoder implementation

media/base/audio_decoder_config.h

Index: media/base/audio_decoder_config.h
diff --git a/media/base/audio_decoder_config.h b/media/base/audio_decoder_config.h
index a0e262f005d3343279ac3e5fa137549d4a203db8..1a9c95797d7c5457575d513510cf0c268ac45010 100644
--- a/media/base/audio_decoder_config.h
+++ b/media/base/audio_decoder_config.h
@@ -111,6 +111,9 @@ class MEDIA_EXPORT AudioDecoderConfig {
   // can be encrypted or not encrypted.
   bool is_encrypted() const { return is_encrypted_; }
 
+  // Modifies sampling rate. Used by decoders based on Android MediaCodec.

[DaleCurtis, 2016/02/04 23:15:31]

We don't have setters for any other values; if possible we should avoid
introducing one just for sample rate. Can you just create a new config instead?

Also for audio we don't support unexpected sample rate changes (i.e. sample rate
changes are not supported with src=, only with MSE where a Flush and reconfigure
occur), so you might be able to simplify some code here.

[Tima Vaisburd, 2016/02/11 20:23:22]

Changed the code not to support sample rate changes on the fly. Thus the method
set_samples_per_second() is also gone. Will the pipeline destroy and recreate
the decoder in case of MSE sample rate change?

+  void set_samples_per_second(int value) { samples_per_second_ = value; }
+
  private:
   AudioCodec codec_;
   SampleFormat sample_format_;