Merge "Effect for multichannel PCM downmix to stereo"

LOCAL_PATH:= $(call my-dir)

# Multichannel downmix effect library

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \

	EffectDownmix.c

LOCAL_SHARED_LIBRARIES := \

	libcutils

LOCAL_MODULE:= libdownmix

LOCAL_MODULE_TAGS := optional

LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/soundfx

ifeq ($(TARGET_OS)-$(TARGET_SIMULATOR),linux-true)

LOCAL_LDLIBS += -ldl

endif

LOCAL_C_INCLUDES := \

	system/media/audio_effects/include \

	system/media/audio_utils/include

LOCAL_PRELINK_MODULE := false

include $(BUILD_SHARED_LIBRARY)

/*

 * Copyright (C) 2012 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef ANDROID_EFFECTDOWNMIX_H_

#define ANDROID_EFFECTDOWNMIX_H_

#include <audio_effects/effect_downmix.h>

#include <audio_utils/primitives.h>

#include <system/audio.h>

/*------------------------------------

 * definitions

 *------------------------------------

*/

#define DOWNMIX_OUTPUT_CHANNELS AUDIO_CHANNEL_OUT_STEREO

typedef enum {

    DOWNMIX_STATE_UNINITIALIZED,

    DOWNMIX_STATE_INITIALIZED,

    DOWNMIX_STATE_ACTIVE,

} downmix_state_t;

/* parameters for each downmixer */

typedef struct {

    downmix_state_t state;

    downmix_type_t type;

    bool apply_volume_correction;

    uint8_t input_channel_count;

} downmix_object_t;

typedef struct downmix_module_s {

    const struct effect_interface_s *itfe;

    effect_config_t config;

    downmix_object_t context;

} downmix_module_t;

/*------------------------------------

 * Effect API

 *------------------------------------

*/

int32_t DownmixLib_QueryNumberEffects(uint32_t *pNumEffects);

int32_t DownmixLib_QueryEffect(uint32_t index,

        effect_descriptor_t *pDescriptor);

int32_t DownmixLib_Create(const effect_uuid_t *uuid,

        int32_t sessionId,

        int32_t ioId,

        effect_handle_t *pHandle);

int32_t DownmixLib_Release(effect_handle_t handle);

int32_t DownmixLib_GetDescriptor(const effect_uuid_t *uuid,

        effect_descriptor_t *pDescriptor);

static int Downmix_Process(effect_handle_t self,

        audio_buffer_t *inBuffer,

        audio_buffer_t *outBuffer);

static int Downmix_Command(effect_handle_t self,

        uint32_t cmdCode,

        uint32_t cmdSize,

        void *pCmdData,

        uint32_t *replySize,

        void *pReplyData);

static int Downmix_GetDescriptor(effect_handle_t self,

        effect_descriptor_t *pDescriptor);

/*------------------------------------

 * internal functions

 *------------------------------------

*/

int Downmix_Init(downmix_module_t *pDwmModule);

int Downmix_Configure(downmix_module_t *pDwmModule, effect_config_t *pConfig, bool init);

int Downmix_Reset(downmix_object_t *pDownmixer, bool init);

int Downmix_setParameter(downmix_object_t *pDownmixer, int32_t param, size_t size, void *pValue);

int Downmix_getParameter(downmix_object_t *pDownmixer, int32_t param, size_t *pSize, void *pValue);

void Downmix_foldFromQuad(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool accumulate);

void Downmix_foldFromSurround(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool accumulate);

void Downmix_foldFrom5Point1(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool accumulate);

void Downmix_foldFrom7Point1(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool accumulate);

#endif /*ANDROID_EFFECTDOWNMIX_H_*/