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/*
* Copyright (C) 2010 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_EFFECTSFACTORYAPI_H_
#define ANDROID_EFFECTSFACTORYAPI_H_
#include <errno.h>
#include <stdint.h>
#include <sys/types.h>
#include <hardware/audio_effect.h>
#if __cplusplus
extern "C" {
#endif
/////////////////////////////////////////////////
// Effect factory interface
/////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectQueryNumberEffects
//
// Description: Returns the number of different effects in all loaded libraries.
// Each effect must have a different effect uuid (see
// effect_descriptor_t). This function together with EffectQueryEffect()
// is used to enumerate all effects present in all loaded libraries.
// Each time EffectQueryNumberEffects() is called, the factory must
// reset the index of the effect descriptor returned by next call to
// EffectQueryEffect() to restart enumeration from the beginning.
//
// Input/Output:
// pNumEffects: address where the number of effects should be returned.
//
// Output:
// returned value: 0 successful operation.
// -ENODEV factory failed to initialize
// -EINVAL invalid pNumEffects
// *pNumEffects: updated with number of effects in factory
//
////////////////////////////////////////////////////////////////////////////////
int EffectQueryNumberEffects(uint32_t *pNumEffects);
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectQueryEffect
//
// Description: Returns a descriptor of the next available effect.
// See effect_descriptor_t for a details on effect descriptor.
// This function together with EffectQueryNumberEffects() is used to enumerate all
// effects present in all loaded libraries. The enumeration sequence is:
// EffectQueryNumberEffects(&num_effects);
// for (i = 0; i < num_effects; i++)
// EffectQueryEffect(i,...);
//
// Input/Output:
// pDescriptor: address where to return the effect descriptor.
//
// Output:
// returned value: 0 successful operation.
// -ENOENT no more effect available
// -ENODEV factory failed to initialize
// -EINVAL invalid pDescriptor
// -ENOSYS effect list has changed since last execution of EffectQueryNumberEffects()
// *pDescriptor: updated with the effect descriptor.
//
////////////////////////////////////////////////////////////////////////////////
int EffectQueryEffect(uint32_t index, effect_descriptor_t *pDescriptor);
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectCreate
//
// Description: Creates an effect engine of the specified type and returns an
// effect control interface on this engine. The function will allocate the
// resources for an instance of the requested effect engine and return
// a handle on the effect control interface.
//
// Input:
// pEffectUuid: pointer to the effect uuid.
// sessionId: audio session to which this effect instance will be attached. All effects created
// with the same session ID are connected in series and process the same signal stream.
// Knowing that two effects are part of the same effect chain can help the library implement
// some kind of optimizations.
// ioId: identifies the output or input stream this effect is directed to at audio HAL. For future
// use especially with tunneled HW accelerated effects
//
// Input/Output:
// pHandle: address where to return the effect handle.
//
// Output:
// returned value: 0 successful operation.
// -ENODEV factory failed to initialize
// -EINVAL invalid pEffectUuid or pHandle
// -ENOENT no effect with this uuid found
// *pHandle: updated with the effect handle.
//
////////////////////////////////////////////////////////////////////////////////
int EffectCreate(const effect_uuid_t *pEffectUuid, int32_t sessionId, int32_t ioId, effect_handle_t *pHandle);
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectRelease
//
// Description: Releases the effect engine whose handle is given as argument.
// All resources allocated to this particular instance of the effect are
// released.
//
// Input:
// handle: handle on the effect interface to be released.
//
// Output:
// returned value: 0 successful operation.
// -ENODEV factory failed to initialize
// -EINVAL invalid interface handle
//
////////////////////////////////////////////////////////////////////////////////
int EffectRelease(effect_handle_t handle);
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectGetDescriptor
//
// Description: Returns the descriptor of the effect which uuid is pointed
// to by first argument.
//
// Input:
// pEffectUuid: pointer to the effect uuid.
//
// Input/Output:
// pDescriptor: address where to return the effect descriptor.
//
// Output:
// returned value: 0 successful operation.
// -ENODEV factory failed to initialize
// -EINVAL invalid pEffectUuid or pDescriptor
// -ENOENT no effect with this uuid found
// *pDescriptor: updated with the effect descriptor.
//
////////////////////////////////////////////////////////////////////////////////
int EffectGetDescriptor(const effect_uuid_t *pEffectUuid, effect_descriptor_t *pDescriptor);
////////////////////////////////////////////////////////////////////////////////
//
// Function: EffectIsNullUuid
//
// Description: Helper function to compare effect uuid to EFFECT_UUID_NULL
//
// Input:
// pEffectUuid: pointer to effect uuid to compare to EFFECT_UUID_NULL.
//
// Output:
// returned value: 0 if uuid is different from EFFECT_UUID_NULL.
// 1 if uuid is equal to EFFECT_UUID_NULL.
//
////////////////////////////////////////////////////////////////////////////////
int EffectIsNullUuid(const effect_uuid_t *pEffectUuid);
#if __cplusplus
} // extern "C"
#endif
#endif /*ANDROID_EFFECTSFACTORYAPI_H_*/
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