Add channel index mask to AudioMixer (650ceb93) · Commits · e / os / android_frameworks_av

services/audioflinger/AudioMixer.cpp

+44 −6

Original line number	Diff line number	Diff line
		@@ -341,11 +341,46 @@ AudioMixer::RemixBufferProvider::RemixBufferProvider(audio_channel_mask_t inputC
		ALOGV("RemixBufferProvider(%p)(%#x, %#x, %#x) %zu %zu",
		this, format, inputChannelMask, outputChannelMask,
		mInputChannels, mOutputChannels);
		// TODO: consider channel representation in index array formulation
		// We ignore channel representation, and just use the bits.

		const audio_channel_representation_t inputRepresentation =
		audio_channel_mask_get_representation(inputChannelMask);
		const audio_channel_representation_t outputRepresentation =
		audio_channel_mask_get_representation(outputChannelMask);
		const uint32_t inputBits = audio_channel_mask_get_bits(inputChannelMask);
		const uint32_t outputBits = audio_channel_mask_get_bits(outputChannelMask);

		switch (inputRepresentation) {
		case AUDIO_CHANNEL_REPRESENTATION_POSITION:
		switch (outputRepresentation) {
		case AUDIO_CHANNEL_REPRESENTATION_POSITION:
		memcpy_by_index_array_initialization(mIdxAry, ARRAY_SIZE(mIdxAry),
		audio_channel_mask_get_bits(outputChannelMask),
		audio_channel_mask_get_bits(inputChannelMask));
		outputBits, inputBits);
		return;
		case AUDIO_CHANNEL_REPRESENTATION_INDEX:
		// TODO: output channel index mask not currently allowed
		// fall through
		default:
		break;
		}
		break;
		case AUDIO_CHANNEL_REPRESENTATION_INDEX:
		switch (outputRepresentation) {
		case AUDIO_CHANNEL_REPRESENTATION_POSITION:
		memcpy_by_index_array_initialization_src_index(mIdxAry, ARRAY_SIZE(mIdxAry),
		outputBits, inputBits);
		return;
		case AUDIO_CHANNEL_REPRESENTATION_INDEX:
		// TODO: output channel index mask not currently allowed
		// fall through
		default:
		break;
		}
		break;
		default:
		break;
		}
		LOG_ALWAYS_FATAL("invalid channel mask conversion from %#x to %#x",
		inputChannelMask, outputChannelMask);
		}

		void AudioMixer::RemixBufferProvider::copyFrames(void dst, const void src, size_t frames)
		@@ -605,7 +640,10 @@ status_t AudioMixer::track_t::prepareForDownmix()
		&& mMixerChannelMask == AUDIO_CHANNEL_OUT_STEREO)) {
		return NO_ERROR;
		}
		if (DownmixerBufferProvider::isMultichannelCapable()) {
		// DownmixerBufferProvider is only used for position masks.
		if (audio_channel_mask_get_representation(channelMask)
		== AUDIO_CHANNEL_REPRESENTATION_POSITION
		&& DownmixerBufferProvider::isMultichannelCapable()) {
		DownmixerBufferProvider* pDbp = new DownmixerBufferProvider(channelMask,
		mMixerChannelMask,
		AUDIO_FORMAT_PCM_16_BIT /* TODO: use mMixerInFormat, now only PCM 16 */,