am 09ff9125: Merge "Convert record channel mask for dynamic mix" into lmp-mr1-dev (14b90924) · Commits · e / os / android_frameworks_base

media/java/android/media/AudioFormat.java

+23 −0

Original line number	Diff line number	Diff line
		@@ -126,6 +126,29 @@ public class AudioFormat {
		CHANNEL_OUT_LOW_FREQUENCY);
		// CHANNEL_OUT_ALL is not yet defined; if added then it should match AUDIO_CHANNEL_OUT_ALL

		/**
		* @hide
		* Return the input channel mask corresponding to an output channel mask.
		* This can be used for submix rerouting for the mask of the recorder to map to that of the mix.
		* @param outMask a combination of the CHANNEL_OUT_* definitions, but not CHANNEL_OUT_DEFAULT
		* @return a combination of CHANNEL_IN_* definitions matching an output channel mask
		* @throws IllegalArgumentException
		*/
		public static int inChannelMaskFromOutChannelMask(int outMask) throws IllegalArgumentException {
		if (outMask == CHANNEL_OUT_DEFAULT) {
		throw new IllegalArgumentException(
		"Illegal CHANNEL_OUT_DEFAULT channel mask for input.");
		}
		switch (channelCountFromOutChannelMask(outMask)) {
		case 1:
		return CHANNEL_IN_MONO;
		case 2:
		return CHANNEL_IN_STEREO;
		default:
		throw new IllegalArgumentException("Unsupported channel configuration for input.");
		}
		}

		/**
		* @hide
		* Return the number of channels from an input channel mask

+8 −1

Original line number	Diff line number	Diff line
		@@ -155,6 +155,7 @@ public class AudioPolicy {
		{
		throw new IllegalArgumentException("Invalid AudioMix: not defined for loop back");
		}
		// TODO also check mix is defined for playback or recording, and matches forTrack argument
		}

		/**
		@@ -175,13 +176,19 @@ public class AudioPolicy {
		return null;
		}
		checkMixReadyToUse(mix, false/not for an AudioTrack/);
		// create an AudioFormat from the mix format compatible with recording, as the mix
		// was defined for playback
		AudioFormat mixFormat = new AudioFormat.Builder(mix.getFormat())
		.setChannelMask(AudioFormat.inChannelMaskFromOutChannelMask(
		mix.getFormat().getChannelMask()))
		.build();
		// create the AudioRecord, configured for loop back, using the same format as the mix
		AudioRecord ar = new AudioRecord(
		new AudioAttributes.Builder()
		.setInternalCapturePreset(MediaRecorder.AudioSource.REMOTE_SUBMIX)
		.addTag(mix.getRegistration())
		.build(),
		mix.getFormat(),
		mixFormat,
		AudioRecord.getMinBufferSize(mix.getFormat().getSampleRate(),
		// using stereo for buffer size to avoid the current poor support for masks
		AudioFormat.CHANNEL_IN_STEREO, mix.getFormat().getEncoding()),