EffectDownmix: Move processing to audio_utils ChannelMix (e807e6bc) · Commits · e / os / android_frameworks_av

media/libeffects/downmix/EffectDownmix.cpp

+11 −335

Original line number	Diff line number	Diff line
		@@ -19,7 +19,7 @@
		#include <log/log.h>

		#include "EffectDownmix.h"
		#include <math.h>
		#include <audio_utils/ChannelMix.h>

		// Do not submit with DOWNMIX_TEST_CHANNEL_INDEX defined, strictly for testing
		//#define DOWNMIX_TEST_CHANNEL_INDEX 0
		@@ -35,12 +35,13 @@ typedef enum {
		} downmix_state_t;

		/* parameters for each downmixer */
		typedef struct {
		struct downmix_object_t {
		downmix_state_t state;
		downmix_type_t type;
		bool apply_volume_correction;
		uint8_t input_channel_count;
		} downmix_object_t;
		android::audio_utils::channels::ChannelMix channelMix;
		};

		typedef struct downmix_module_s {
		const struct effect_interface_s *itfe;
		@@ -77,11 +78,6 @@ static int Downmix_setParameter(
		downmix_object_t pDownmixer, int32_t param, uint32_t size, void pValue);
		static int Downmix_getParameter(
		downmix_object_t pDownmixer, int32_t param, uint32_t pSize, void *pValue);
		static void Downmix_foldFromQuad(float pSrc, float pDst, size_t numFrames, bool accumulate);
		static void Downmix_foldFrom5Point1(float pSrc, float pDst, size_t numFrames, bool accumulate);
		static void Downmix_foldFrom7Point1(float pSrc, float pDst, size_t numFrames, bool accumulate);
		static bool Downmix_foldGeneric(
		uint32_t mask, float pSrc, float pDst, size_t numFrames, bool accumulate);

		// effect_handle_t interface implementation for downmix effect
		const struct effect_interface_s gDownmixInterface = {
		@@ -315,7 +311,8 @@ static int32_t Downmix_Process(effect_handle_t self,
		audio_buffer_t inBuffer, audio_buffer_t outBuffer) {

		downmix_object_t *pDownmixer;
		float pSrc, pDst;
		const float *pSrc;
		float *pDst;
		downmix_module_t pDwmModule = (downmix_module_t )self;

		if (pDwmModule == NULL) {
		@@ -344,7 +341,8 @@ static int32_t Downmix_Process(effect_handle_t self,

		const bool accumulate =
		(pDwmModule->config.outputCfg.accessMode == EFFECT_BUFFER_ACCESS_ACCUMULATE);
		const uint32_t downmixInputChannelMask = pDwmModule->config.inputCfg.channels;
		const audio_channel_mask_t downmixInputChannelMask =
		(audio_channel_mask_t)pDwmModule->config.inputCfg.channels;

		switch(pDownmixer->type) {

		@@ -368,38 +366,13 @@ static int32_t Downmix_Process(effect_handle_t self,
		}
		break;

		case DOWNMIX_TYPE_FOLD:
		#ifdef DOWNMIX_ALWAYS_USE_GENERIC_DOWNMIXER
		// bypass the optimized downmix routines for the common formats
		if (!Downmix_foldGeneric(
		downmixInputChannelMask, pSrc, pDst, numFrames, accumulate)) {
		ALOGE("Multichannel configuration %#x is not supported",
		downmixInputChannelMask);
		return -EINVAL;
		}
		break;
		#endif
		// optimize for the common formats
		switch (downmixInputChannelMask) {
		case AUDIO_CHANNEL_OUT_QUAD_BACK:
		case AUDIO_CHANNEL_OUT_QUAD_SIDE:
		Downmix_foldFromQuad(pSrc, pDst, numFrames, accumulate);
		break;
		case AUDIO_CHANNEL_OUT_5POINT1_BACK:
		case AUDIO_CHANNEL_OUT_5POINT1_SIDE:
		Downmix_foldFrom5Point1(pSrc, pDst, numFrames, accumulate);
		break;
		case AUDIO_CHANNEL_OUT_7POINT1:
		Downmix_foldFrom7Point1(pSrc, pDst, numFrames, accumulate);
		break;
		default:
		if (!Downmix_foldGeneric(
		downmixInputChannelMask, pSrc, pDst, numFrames, accumulate)) {
		case DOWNMIX_TYPE_FOLD: {
		if (!pDownmixer->channelMix.process(
		pSrc, pDst, numFrames, accumulate, downmixInputChannelMask)) {
		ALOGE("Multichannel configuration %#x is not supported",
		downmixInputChannelMask);
		return -EINVAL;
		}
		break;
		}
		break;

		@@ -780,7 +753,6 @@ static int Downmix_setParameter(
		return 0;
		} /* end Downmix_setParameter */


		/*----------------------------------------------------------------------------
		* Downmix_getParameter()
		*----------------------------------------------------------------------------
		@@ -829,299 +801,3 @@ static int Downmix_getParameter(
		return 0;
		} /* end Downmix_getParameter */


		/*----------------------------------------------------------------------------
		* Downmix_foldFromQuad()
		*----------------------------------------------------------------------------
		* Purpose:
		* downmix a quad signal to stereo
		*
		* Inputs:
		* pSrc quad audio samples to downmix
		* numFrames the number of quad frames to downmix
		* accumulate whether to mix (when true) the result of the downmix with the contents of pDst,
		* or overwrite pDst (when false)
		*
		* Outputs:
		* pDst downmixed stereo audio samples
		*
		*----------------------------------------------------------------------------
		*/
		void Downmix_foldFromQuad(float pSrc, float pDst, size_t numFrames, bool accumulate) {
		// sample at index 0 is FL
		// sample at index 1 is FR
		// sample at index 2 is RL
		// sample at index 3 is RR
		if (accumulate) {
		while (numFrames) {
		// FL + RL
		pDst[0] = clamp_float(pDst[0] + ((pSrc[0] + pSrc[2]) / 2.0f));
		// FR + RR
		pDst[1] = clamp_float(pDst[1] + ((pSrc[1] + pSrc[3]) / 2.0f));
		pSrc += 4;
		pDst += 2;
		numFrames--;
		}
		} else { // same code as above but without adding and clamping pDst[i] to itself
		while (numFrames) {
		// FL + RL
		pDst[0] = clamp_float((pSrc[0] + pSrc[2]) / 2.0f);
		// FR + RR
		pDst[1] = clamp_float((pSrc[1] + pSrc[3]) / 2.0f);
		pSrc += 4;
		pDst += 2;
		numFrames--;
		}
		}
		}

		/*----------------------------------------------------------------------------
		* Downmix_foldFrom5Point1()
		*----------------------------------------------------------------------------
		* Purpose:
		* downmix a 5.1 signal to stereo
		*
		* Inputs:
		* pSrc 5.1 audio samples to downmix
		* numFrames the number of 5.1 frames to downmix
		* accumulate whether to mix (when true) the result of the downmix with the contents of pDst,
		* or overwrite pDst (when false)
		*
		* Outputs:
		* pDst downmixed stereo audio samples
		*
		*----------------------------------------------------------------------------
		*/
		void Downmix_foldFrom5Point1(float pSrc, float pDst, size_t numFrames, bool accumulate) {
		float lt, rt, centerPlusLfeContrib; // samples in Q19.12 format
		// sample at index 0 is FL
		// sample at index 1 is FR
		// sample at index 2 is FC
		// sample at index 3 is LFE
		// sample at index 4 is RL
		// sample at index 5 is RR
		// code is mostly duplicated between the two values of accumulate to avoid repeating the test
		// for every sample
		if (accumulate) {
		while (numFrames) {
		// centerPlusLfeContrib = FC(-3dB) + LFE(-3dB)
		centerPlusLfeContrib = (pSrc[2] * MINUS_3_DB_IN_FLOAT)
		+ (pSrc[3] * MINUS_3_DB_IN_FLOAT);
		// FL + centerPlusLfeContrib + RL
		lt = pSrc[0] + centerPlusLfeContrib + pSrc[4];
		// FR + centerPlusLfeContrib + RR
		rt = pSrc[1] + centerPlusLfeContrib + pSrc[5];
		// accumulate in destination
		pDst[0] = clamp_float(pDst[0] + (lt / 2.0f));
		pDst[1] = clamp_float(pDst[1] + (rt / 2.0f));
		pSrc += 6;
		pDst += 2;
		numFrames--;
		}
		} else { // same code as above but without adding and clamping pDst[i] to itself
		while (numFrames) {
		// centerPlusLfeContrib = FC(-3dB) + LFE(-3dB)
		centerPlusLfeContrib = (pSrc[2] * MINUS_3_DB_IN_FLOAT)
		+ (pSrc[3] * MINUS_3_DB_IN_FLOAT);
		// FL + centerPlusLfeContrib + RL
		lt = pSrc[0] + centerPlusLfeContrib + pSrc[4];
		// FR + centerPlusLfeContrib + RR
		rt = pSrc[1] + centerPlusLfeContrib + pSrc[5];
		// store in destination
		pDst[0] = clamp_float(lt / 2.0f); // differs from when accumulate is true above
		pDst[1] = clamp_float(rt / 2.0f); // differs from when accumulate is true above
		pSrc += 6;
		pDst += 2;
		numFrames--;
		}
		}
		}

		/*----------------------------------------------------------------------------
		* Downmix_foldFrom7Point1()
		*----------------------------------------------------------------------------
		* Purpose:
		* downmix a 7.1 signal to stereo
		*
		* Inputs:
		* pSrc 7.1 audio samples to downmix
		* numFrames the number of 7.1 frames to downmix
		* accumulate whether to mix (when true) the result of the downmix with the contents of pDst,
		* or overwrite pDst (when false)
		*
		* Outputs:
		* pDst downmixed stereo audio samples
		*
		*----------------------------------------------------------------------------
		*/
		void Downmix_foldFrom7Point1(float pSrc, float pDst, size_t numFrames, bool accumulate) {
		float lt, rt, centerPlusLfeContrib; // samples in Q19.12 format
		// sample at index 0 is FL
		// sample at index 1 is FR
		// sample at index 2 is FC
		// sample at index 3 is LFE
		// sample at index 4 is RL
		// sample at index 5 is RR
		// sample at index 6 is SL
		// sample at index 7 is SR
		// code is mostly duplicated between the two values of accumulate to avoid repeating the test
		// for every sample
		if (accumulate) {
		while (numFrames) {
		// centerPlusLfeContrib = FC(-3dB) + LFE(-3dB)
		centerPlusLfeContrib = (pSrc[2] * MINUS_3_DB_IN_FLOAT)
		+ (pSrc[3] * MINUS_3_DB_IN_FLOAT);
		// FL + centerPlusLfeContrib + SL + RL
		lt = pSrc[0] + centerPlusLfeContrib + pSrc[6] + pSrc[4];
		// FR + centerPlusLfeContrib + SR + RR
		rt = pSrc[1] + centerPlusLfeContrib + pSrc[7] + pSrc[5];
		//accumulate in destination
		pDst[0] = clamp_float(pDst[0] + (lt / 2.0f));
		pDst[1] = clamp_float(pDst[1] + (rt / 2.0f));
		pSrc += 8;
		pDst += 2;
		numFrames--;
		}
		} else { // same code as above but without adding and clamping pDst[i] to itself
		while (numFrames) {
		// centerPlusLfeContrib = FC(-3dB) + LFE(-3dB)
		centerPlusLfeContrib = (pSrc[2] * MINUS_3_DB_IN_FLOAT)
		+ (pSrc[3] * MINUS_3_DB_IN_FLOAT);
		// FL + centerPlusLfeContrib + SL + RL
		lt = pSrc[0] + centerPlusLfeContrib + pSrc[6] + pSrc[4];
		// FR + centerPlusLfeContrib + SR + RR
		rt = pSrc[1] + centerPlusLfeContrib + pSrc[7] + pSrc[5];
		// store in destination
		pDst[0] = clamp_float(lt / 2.0f); // differs from when accumulate is true above
		pDst[1] = clamp_float(rt / 2.0f); // differs from when accumulate is true above
		pSrc += 8;
		pDst += 2;
		numFrames--;
		}
		}
		}

		/*----------------------------------------------------------------------------
		* Downmix_foldGeneric()
		*----------------------------------------------------------------------------
		* Purpose:
		* downmix to stereo a multichannel signal of arbitrary channel position mask.
		*
		* Inputs:
		* mask the channel mask of pSrc
		* pSrc multichannel audio buffer to downmix
		* numFrames the number of multichannel frames to downmix
		* accumulate whether to mix (when true) the result of the downmix with the contents of pDst,
		* or overwrite pDst (when false)
		*
		* Outputs:
		* pDst downmixed stereo audio samples
		*
		* Returns: false if multichannel format is not supported
		*
		*----------------------------------------------------------------------------
		*/
		bool Downmix_foldGeneric(
		uint32_t mask, float pSrc, float pDst, size_t numFrames, bool accumulate) {

		if (!Downmix_validChannelMask(mask)) {
		return false;
		}
		const int numChan = audio_channel_count_from_out_mask(mask);

		// compute at what index each channel is: samples will be in the following order:
		// FL FR FC LFE BL BR BC SL SR
		//
		// (transfer matrix)
		// FL FR FC LFE BL BR BC SL SR
		// 0.5 0.353 0.353 0.5 0.353 0.5
		// 0.5 0.353 0.353 0.5 0.353 0.5

		// derive the indices for the transfer matrix columns that have non-zero values.
		int indexFL = -1;
		int indexFR = -1;
		int indexFC = -1;
		int indexLFE = -1;
		int indexBL = -1;
		int indexBR = -1;
		int indexBC = -1;
		int indexSL = -1;
		int indexSR = -1;
		int index = 0;
		for (unsigned tmp = mask;
		(tmp & (AUDIO_CHANNEL_OUT_7POINT1 \| AUDIO_CHANNEL_OUT_BACK_CENTER)) != 0;
		++index) {
		const unsigned lowestBit = tmp & -(signed)tmp;
		switch (lowestBit) {
		case AUDIO_CHANNEL_OUT_FRONT_LEFT:
		indexFL = index;
		break;
		case AUDIO_CHANNEL_OUT_FRONT_RIGHT:
		indexFR = index;
		break;
		case AUDIO_CHANNEL_OUT_FRONT_CENTER:
		indexFC = index;
		break;
		case AUDIO_CHANNEL_OUT_LOW_FREQUENCY:
		indexLFE = index;
		break;
		case AUDIO_CHANNEL_OUT_BACK_LEFT:
		indexBL = index;
		break;
		case AUDIO_CHANNEL_OUT_BACK_RIGHT:
		indexBR = index;
		break;
		case AUDIO_CHANNEL_OUT_BACK_CENTER:
		indexBC = index;
		break;
		case AUDIO_CHANNEL_OUT_SIDE_LEFT:
		indexSL = index;
		break;
		case AUDIO_CHANNEL_OUT_SIDE_RIGHT:
		indexSR = index;
		break;
		}
		tmp ^= lowestBit;
		}

		// With good branch prediction, this should run reasonably fast.
		// Also consider using a transfer matrix form.
		while (numFrames) {
		// compute contribution of FC, BC and LFE
		float centersLfeContrib = 0;
		if (indexFC >= 0) centersLfeContrib = pSrc[indexFC];
		if (indexLFE >= 0) centersLfeContrib += pSrc[indexLFE];
		if (indexBC >= 0) centersLfeContrib += pSrc[indexBC];
		centersLfeContrib *= MINUS_3_DB_IN_FLOAT;

		float ch[2];
		ch[0] = centersLfeContrib;
		ch[1] = centersLfeContrib;

		// mix in left / right channels
		if (indexFL >= 0) ch[0] += pSrc[indexFL];
		if (indexFR >= 0) ch[1] += pSrc[indexFR];

		if (indexSL >= 0) ch[0] += pSrc[indexSL];
		if (indexSR >= 0) ch[1] += pSrc[indexSR]; // note pair checks enforce this if indexSL != 0

		if (indexBL >= 0) ch[0] += pSrc[indexBL];
		if (indexBR >= 0) ch[1] += pSrc[indexBR]; // note pair checks enforce this if indexBL != 0

		// scale to prevent overflow.
		ch[0] *= 0.5f;
		ch[1] *= 0.5f;

		if (accumulate) {
		ch[0] += pDst[0];
		ch[1] += pDst[1];
		}

		pDst[0] = clamp_float(ch[0]);
		pDst[1] = clamp_float(ch[1]);
		pSrc += numChan;
		pDst += 2;
		numFrames--;
		}
		return true;
		}

media/libeffects/downmix/benchmark/downmix_benchmark.cpp

+31 −58

Original line number	Diff line number	Diff line
		@@ -35,16 +35,14 @@ static constexpr audio_channel_mask_t kChannelPositionMasks[] = {
		AUDIO_CHANNEL_OUT_STEREO,
		AUDIO_CHANNEL_OUT_2POINT1,
		AUDIO_CHANNEL_OUT_2POINT0POINT2,
		AUDIO_CHANNEL_OUT_QUAD,
		AUDIO_CHANNEL_OUT_QUAD_BACK,
		AUDIO_CHANNEL_OUT_QUAD, // AUDIO_CHANNEL_OUT_QUAD_BACK
		AUDIO_CHANNEL_OUT_QUAD_SIDE,
		AUDIO_CHANNEL_OUT_SURROUND,
		AUDIO_CHANNEL_OUT_2POINT1POINT2,
		AUDIO_CHANNEL_OUT_3POINT0POINT2,
		AUDIO_CHANNEL_OUT_PENTA,
		AUDIO_CHANNEL_OUT_3POINT1POINT2,
		AUDIO_CHANNEL_OUT_5POINT1,
		AUDIO_CHANNEL_OUT_5POINT1_BACK,
		AUDIO_CHANNEL_OUT_5POINT1, // AUDIO_CHANNEL_OUT_5POINT1_BACK
		AUDIO_CHANNEL_OUT_5POINT1_SIDE,
		AUDIO_CHANNEL_OUT_6POINT1,
		AUDIO_CHANNEL_OUT_5POINT1POINT2,
		@@ -62,58 +60,32 @@ static constexpr effect_uuid_t downmix_uuid = {
		static constexpr size_t kFrameCount = 1000;

		/*
		Pixel 3XL
		downmix_benchmark:
		#BM_Downmix/0 4723 ns 4708 ns 148694
		#BM_Downmix/1 4717 ns 4702 ns 148873
		#BM_Downmix/2 4803 ns 4788 ns 145893
		#BM_Downmix/3 5056 ns 5041 ns 139110
		#BM_Downmix/4 4710 ns 4696 ns 149625
		#BM_Downmix/5 1514 ns 1509 ns 463694
		#BM_Downmix/6 1513 ns 1509 ns 463451
		#BM_Downmix/7 1516 ns 1511 ns 463899
		#BM_Downmix/8 4445 ns 4431 ns 157831
		#BM_Downmix/9 5081 ns 5065 ns 138412
		#BM_Downmix/10 4354 ns 4341 ns 161247
		#BM_Downmix/11 4411 ns 4397 ns 158893
		#BM_Downmix/12 4434 ns 4420 ns 157992
		#BM_Downmix/13 4845 ns 4830 ns 144873
		#BM_Downmix/14 4851 ns 4835 ns 144954
		#BM_Downmix/15 4884 ns 4870 ns 144233
		#BM_Downmix/16 5832 ns 5813 ns 120565
		#BM_Downmix/17 5241 ns 5224 ns 133927
		#BM_Downmix/18 5044 ns 5028 ns 139131
		#BM_Downmix/19 5244 ns 5227 ns 132315
		#BM_Downmix/20 5943 ns 5923 ns 117759
		#BM_Downmix/21 5990 ns 5971 ns 117263
		#BM_Downmix/22 4468 ns 4454 ns 156689
		#BM_Downmix/23 7306 ns 7286 ns 95911
		--
		downmix_benchmark: (generic fold)
		#BM_Downmix/0 4722 ns 4707 ns 149847
		#BM_Downmix/1 4714 ns 4698 ns 148748
		#BM_Downmix/2 4794 ns 4779 ns 145661
		#BM_Downmix/3 5053 ns 5035 ns 139172
		#BM_Downmix/4 4695 ns 4678 ns 149762
		#BM_Downmix/5 4381 ns 4368 ns 159675
		#BM_Downmix/6 4387 ns 4373 ns 160267
		#BM_Downmix/7 4732 ns 4717 ns 148514
		#BM_Downmix/8 4430 ns 4415 ns 158133
		#BM_Downmix/9 5101 ns 5084 ns 138353
		#BM_Downmix/10 4356 ns 4343 ns 160821
		#BM_Downmix/11 4397 ns 4383 ns 159995
		#BM_Downmix/12 4438 ns 4424 ns 158117
		#BM_Downmix/13 5243 ns 5226 ns 133863
		#BM_Downmix/14 5259 ns 5242 ns 131855
		#BM_Downmix/15 5245 ns 5228 ns 133686
		#BM_Downmix/16 5829 ns 5809 ns 120543
		#BM_Downmix/17 5245 ns 5228 ns 133533
		#BM_Downmix/18 5935 ns 5916 ns 118282
		#BM_Downmix/19 5263 ns 5245 ns 133657
		#BM_Downmix/20 5998 ns 5978 ns 114693
		#BM_Downmix/21 5989 ns 5969 ns 117450
		#BM_Downmix/22 4442 ns 4431 ns 157913
		#BM_Downmix/23 7309 ns 7290 ns 95797
		Pixel 4XL
		--------------------------------------------------------
		Benchmark Time CPU Iterations
		--------------------------------------------------------
		BM_Downmix/0 3553 ns 3545 ns 197503 AUDIO_CHANNEL_OUT_MONO
		BM_Downmix/1 2846 ns 2840 ns 202849
		BM_Downmix/2 4436 ns 4426 ns 158176 AUDIO_CHANNEL_OUT_STEREO
		BM_Downmix/3 5320 ns 5307 ns 131870 AUDIO_CHANNEL_OUT_2POINT1
		BM_Downmix/4 4437 ns 4426 ns 159523 AUDIO_CHANNEL_OUT_2POINT0POINT2
		BM_Downmix/5 2493 ns 2487 ns 281496 AUDIO_CHANNEL_OUT_QUAD
		BM_Downmix/6 2493 ns 2487 ns 281456 AUDIO_CHANNEL_OUT_QUAD_SIDE
		BM_Downmix/7 6204 ns 6188 ns 115044 AUDIO_CHANNEL_OUT_SURROUND
		BM_Downmix/8 5320 ns 5307 ns 100000 AUDIO_CHANNEL_OUT_2POINT1POINT2
		BM_Downmix/9 5320 ns 5307 ns 100000 AUDIO_CHANNEL_OUT_3POINT0POINT2
		BM_Downmix/10 7088 ns 7071 ns 108264 AUDIO_CHANNEL_OUT_PENTA
		BM_Downmix/11 6203 ns 6188 ns 117021 AUDIO_CHANNEL_OUT_3POINT1POINT2
		BM_Downmix/12 3105 ns 3097 ns 226182 AUDIO_CHANNEL_OUT_5POINT1
		BM_Downmix/13 3112 ns 3105 ns 225488 AUDIO_CHANNEL_OUT_5POINT1_SIDE
		BM_Downmix/14 8855 ns 8831 ns 79265 AUDIO_CHANNEL_OUT_6POINT1
		BM_Downmix/15 7971 ns 7951 ns 90918 AUDIO_CHANNEL_OUT_5POINT1POINT2
		BM_Downmix/16 3547 ns 3539 ns 197780 AUDIO_CHANNEL_OUT_7POINT1
		BM_Downmix/17 7972 ns 7953 ns 90101 AUDIO_CHANNEL_OUT_5POINT1POINT4
		BM_Downmix/18 9737 ns 9714 ns 72773 AUDIO_CHANNEL_OUT_7POINT1POINT2
		BM_Downmix/19 9745 ns 9721 ns 72015 AUDIO_CHANNEL_OUT_7POINT1POINT4
		BM_Downmix/20 7070 ns 7053 ns 109476 AUDIO_CHANNEL_OUT_13POINT_360RA
		BM_Downmix/21 12413 ns 12381 ns 57455 AUDIO_CHANNEL_OUT_22POINT2
		*/

		static void BM_Downmix(benchmark::State& state) {
		@@ -125,7 +97,7 @@ static void BM_Downmix(benchmark::State& state) {
		std::minstd_rand gen(channelMask);
		std::uniform_real_distribution<> dis(-1.0f, 1.0f);
		std::vector<float> input(kFrameCount * channelCount);
		std::vector<float> output(kFrameCount * 2);
		std::vector<float> output(kFrameCount * FCC_2);
		for (auto& in : input) {
		in = dis(gen);
		}
		@@ -187,7 +159,8 @@ static void BM_Downmix(benchmark::State& state) {
		benchmark::ClobberMemory();
		}

		state.SetComplexityN(state.range(0));
		state.SetComplexityN(channelCount);
		state.SetLabel(audio_channel_out_mask_to_string(channelMask));

		if (int status = AUDIO_EFFECT_LIBRARY_INFO_SYM.release_effect(effectHandle); status != 0) {
		ALOGE("release_effect returned an error = %d\n", status);

media/libeffects/downmix/tests/downmix_tests.cpp

+49 −22

File changed.

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