471 lines
19 KiB
C++
471 lines
19 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIOEFFECT_H
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#define ANDROID_AUDIOEFFECT_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <media/IAudioFlinger.h>
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#include <media/IEffect.h>
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#include <media/IEffectClient.h>
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#include <media/EffectApi.h>
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#include <media/AudioSystem.h>
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#include <utils/RefBase.h>
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#include <utils/Errors.h>
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#include <binder/IInterface.h>
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namespace android {
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// ----------------------------------------------------------------------------
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class effect_param_cblk_t;
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// ----------------------------------------------------------------------------
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class AudioEffect : public RefBase
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{
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public:
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/*
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* Static methods for effect libraries management.
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*/
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/*
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* Loads the effect library which path is given as first argument.
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* This must be the full path of a dynamic library (.so) implementing one or
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* more effect engines and exposing the effect library interface described in
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* EffectApi.h. The function returns a handle on the library for use by
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* further call to unloadEffectLibrary() to unload the library.
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*
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* Parameters:
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* libPath: full path of the dynamic library file in the file system.
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* handle: address where to return the library handle
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*
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* Returned status (from utils/Errors.h) can be:
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* NO_ERROR successful operation.
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* PERMISSION_DENIED could not get AudioFlinger interface or
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* application does not have permission to configure audio
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* NO_INIT effect factory not initialized or
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* library could not be loaded or
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* library does not implement required functions
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* BAD_VALUE invalid libPath string or handle
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*
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* Returned value:
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* *handle updated with library handle
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*/
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static status_t loadEffectLibrary(const char *libPath, int *handle);
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/*
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* Unloads the effect library which handle is given as argument.
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*
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* Parameters:
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* handle: library handle
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*
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* Returned status (from utils/Errors.h) can be:
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* NO_ERROR successful operation.
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* PERMISSION_DENIED could not get AudioFlinger interface or
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* application does not have permission to configure audio
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* NO_INIT effect factory not initialized
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* BAD_VALUE invalid handle
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*/
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static status_t unloadEffectLibrary(int handle);
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/*
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* Static methods for effects enumeration.
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*/
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/*
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* Returns the number of effects available. This method together
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* with queryEffect() is used to enumerate all effects:
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* The enumeration sequence is:
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* queryNumberEffects(&num_effects);
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* for (i = 0; i < num_effects; i++)
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* queryEffect(i,...);
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*
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* Parameters:
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* numEffects: address where the number of effects should be returned.
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*
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* Returned status (from utils/Errors.h) can be:
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* NO_ERROR successful operation.
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* PERMISSION_DENIED could not get AudioFlinger interface
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* NO_INIT effect library failed to initialize
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* BAD_VALUE invalid numEffects pointer
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*
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* Returned value
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* *numEffects: updated with number of effects available
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*/
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static status_t queryNumberEffects(uint32_t *numEffects);
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/*
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* Returns an effect descriptor during effect
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* enumeration.
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*
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* Parameters:
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* index: index of the queried effect.
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* descriptor: address where the effect descriptor should be returned.
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*
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* Returned status (from utils/Errors.h) can be:
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* NO_ERROR successful operation.
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* PERMISSION_DENIED could not get AudioFlinger interface
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* NO_INIT effect library failed to initialize
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* BAD_VALUE invalid descriptor pointer or index
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* INVALID_OPERATION effect list has changed since last execution of queryNumberEffects()
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*
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* Returned value
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* *descriptor: updated with effect descriptor
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*/
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static status_t queryEffect(uint32_t index, effect_descriptor_t *descriptor);
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/*
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* Returns the descriptor for the specified effect uuid.
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*
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* Parameters:
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* uuid: pointer to effect uuid.
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* descriptor: address where the effect descriptor should be returned.
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*
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* Returned status (from utils/Errors.h) can be:
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* NO_ERROR successful operation.
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* PERMISSION_DENIED could not get AudioFlinger interface
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* NO_INIT effect library failed to initialize
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* BAD_VALUE invalid uuid or descriptor pointers
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* NAME_NOT_FOUND no effect with this uuid found
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*
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* Returned value
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* *descriptor updated with effect descriptor
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*/
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static status_t getEffectDescriptor(effect_uuid_t *uuid, effect_descriptor_t *descriptor);
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/*
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* Events used by callback function (effect_callback_t).
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*/
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enum event_type {
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EVENT_CONTROL_STATUS_CHANGED = 0,
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EVENT_ENABLE_STATUS_CHANGED = 1,
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EVENT_PARAMETER_CHANGED = 2,
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EVENT_ERROR = 3
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};
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/* Callback function notifying client application of a change in effect engine state or
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* configuration.
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* An effect engine can be shared by several applications but only one has the control
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* of the engine activity and configuration at a time.
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* The EVENT_CONTROL_STATUS_CHANGED event is received when an application loses or
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* retrieves the control of the effect engine. Loss of control happens
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* if another application requests the use of the engine by creating an AudioEffect for
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* the same effect type but with a higher priority. Control is returned when the
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* application having the control deletes its AudioEffect object.
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* The EVENT_ENABLE_STATUS_CHANGED event is received by all applications not having the
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* control of the effect engine when the effect is enabled or disabled.
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* The EVENT_PARAMETER_CHANGED event is received by all applications not having the
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* control of the effect engine when an effect parameter is changed.
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* The EVENT_ERROR event is received when the media server process dies.
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*
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* Parameters:
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*
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* event: type of event notified (see enum AudioEffect::event_type).
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* user: Pointer to context for use by the callback receiver.
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* info: Pointer to optional parameter according to event type:
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* - EVENT_CONTROL_STATUS_CHANGED: boolean indicating if control is granted (true)
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* or stolen (false).
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* - EVENT_ENABLE_STATUS_CHANGED: boolean indicating if effect is now enabled (true)
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* or disabled (false).
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* - EVENT_PARAMETER_CHANGED: pointer to a effect_param_t structure.
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* - EVENT_ERROR: status_t indicating the error (DEAD_OBJECT when media server dies).
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*/
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typedef void (*effect_callback_t)(int32_t event, void* user, void *info);
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/* Constructor.
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* AudioEffect is the base class for creating and controlling an effect engine from
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* the application process. Creating an AudioEffect object will create the effect engine
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* in the AudioFlinger if no engine of the specified type exists. If one exists, this engine
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* will be used. The application creating the AudioEffect object (or a derived class like
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* Reverb for instance) will either receive control of the effect engine or not, depending
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* on the priority parameter. If priority is higher than the priority used by the current
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* effect engine owner, the control will be transfered to the new application. Otherwise
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* control will remain to the previous application. In this case, the new application will be
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* notified of changes in effect engine state or control ownership by the effect callback.
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* After creating the AudioEffect, the application must call the initCheck() method and
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* check the creation status before trying to control the effect engine (see initCheck()).
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* If the effect is to be applied to an AudioTrack or MediaPlayer only the application
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* must specify the audio session ID corresponding to this player.
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*/
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/* Simple Constructor.
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*/
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AudioEffect();
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/* Constructor.
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*
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* Parameters:
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*
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* type: type of effect created: can be null if uuid is specified. This corresponds to
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* the OpenSL ES interface implemented by this effect.
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* uuid: Uuid of effect created: can be null if type is specified. This uuid corresponds to
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* a particular implementation of an effect type.
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* priority: requested priority for effect control: the priority level corresponds to the
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* value of priority parameter: negative values indicate lower priorities, positive values
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* higher priorities, 0 being the normal priority.
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* cbf: optional callback function (see effect_callback_t)
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* user: pointer to context for use by the callback receiver.
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* sessionID: audio session this effect is associated to. If 0, the effect will be global to
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* the output mix. If not 0, the effect will be applied to all players
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* (AudioTrack or MediaPLayer) within the same audio session.
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* output: HAL audio output stream to which this effect must be attached. Leave at 0 for
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* automatic output selection by AudioFlinger.
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*/
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AudioEffect(const effect_uuid_t *type,
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const effect_uuid_t *uuid = NULL,
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int32_t priority = 0,
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effect_callback_t cbf = 0,
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void* user = 0,
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int sessionId = 0,
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audio_io_handle_t output = 0
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);
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/* Constructor.
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* Same as above but with type and uuid specified by character strings
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*/
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AudioEffect(const char *typeStr,
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const char *uuidStr = NULL,
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int32_t priority = 0,
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effect_callback_t cbf = 0,
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void* user = 0,
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int sessionId = 0,
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audio_io_handle_t output = 0
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);
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/* Terminates the AudioEffect and unregisters it from AudioFlinger.
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* The effect engine is also destroyed if this AudioEffect was the last controlling
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* the engine.
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*/
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~AudioEffect();
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/* Initialize an uninitialized AudioEffect.
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR or ALREADY_EXISTS: successful initialization
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* - INVALID_OPERATION: AudioEffect is already initialized
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* - BAD_VALUE: invalid parameter
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* - NO_INIT: audio flinger or audio hardware not initialized
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* */
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status_t set(const effect_uuid_t *type,
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const effect_uuid_t *uuid = NULL,
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int32_t priority = 0,
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effect_callback_t cbf = 0,
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void* user = 0,
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int sessionId = 0,
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audio_io_handle_t output = 0
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);
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/* Result of constructing the AudioEffect. This must be checked
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* before using any AudioEffect API.
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* initCheck() can return:
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* - NO_ERROR: the effect engine is successfully created and the application has control.
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* - ALREADY_EXISTS: the effect engine is successfully created but the application does not
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* have control.
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* - NO_INIT: the effect creation failed.
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*
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*/
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status_t initCheck() const;
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/* Returns the unique effect Id for the controlled effect engine. This ID is unique
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* system wide and is used for instance in the case of auxiliary effects to attach
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* the effect to an AudioTrack or MediaPlayer.
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*
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*/
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int32_t id() const { return mId; }
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/* Returns a descriptor for the effect (see effect_descriptor_t in EffectApi.h).
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*/
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effect_descriptor_t descriptor() const;
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/* Returns effect control priority of this AudioEffect object.
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*/
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int32_t priority() const { return mPriority; }
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/* Enables or disables the effect engine.
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*
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* Parameters:
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* enabled: requested enable state.
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation
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* - INVALID_OPERATION: the application does not have control of the effect engine or the
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* effect is already in the requested state.
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*/
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virtual status_t setEnabled(bool enabled);
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bool getEnabled() const;
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/* Sets a parameter value.
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*
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* Parameters:
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* param: pointer to effect_param_t structure containing the parameter
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* and its value (See EffectApi.h).
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation.
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* - INVALID_OPERATION: the application does not have control of the effect engine.
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* - BAD_VALUE: invalid parameter identifier or value.
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* - DEAD_OBJECT: the effect engine has been deleted.
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*/
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virtual status_t setParameter(effect_param_t *param);
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/* Prepare a new parameter value that will be set by next call to
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* setParameterCommit(). This method can be used to set multiple parameters
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* in a synchronous manner or to avoid multiple binder calls for each
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* parameter.
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*
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* Parameters:
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* param: pointer to effect_param_t structure containing the parameter
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* and its value (See EffectApi.h).
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation.
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* - INVALID_OPERATION: the application does not have control of the effect engine.
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* - NO_MEMORY: no more space available in shared memory used for deferred parameter
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* setting.
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*/
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virtual status_t setParameterDeferred(effect_param_t *param);
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/* Commit all parameter values previously prepared by setParameterDeferred().
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*
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* Parameters:
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* none
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation.
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* - INVALID_OPERATION: No new parameter values ready for commit.
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* - BAD_VALUE: invalid parameter identifier or value: there is no indication
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* as to which of the parameters caused this error.
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* - DEAD_OBJECT: the effect engine has been deleted.
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*/
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virtual status_t setParameterCommit();
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/* Gets a parameter value.
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*
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* Parameters:
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* param: pointer to effect_param_t structure containing the parameter
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* and the returned value (See EffectApi.h).
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*
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* Returned status (from utils/Errors.h) can be:
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* - NO_ERROR: successful operation.
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* - INVALID_OPERATION: the AudioEffect was not successfully initialized.
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* - BAD_VALUE: invalid parameter identifier.
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* - DEAD_OBJECT: the effect engine has been deleted.
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*/
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virtual status_t getParameter(effect_param_t *param);
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/* Sends a command and receives a response to/from effect engine.
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* See EffectApi.h for details on effect command() function, valid command codes
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* and formats.
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*/
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virtual status_t command(uint32_t cmdCode,
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uint32_t cmdSize,
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void *cmdData,
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uint32_t *replySize,
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void *replyData);
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/*
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* Utility functions.
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*/
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/* Converts the string passed as first argument to the effect_uuid_t
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* pointed to by second argument
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*/
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static status_t stringToGuid(const char *str, effect_uuid_t *guid);
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/* Converts the effect_uuid_t pointed to by first argument to the
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* string passed as second argument
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*/
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static status_t guidToString(const effect_uuid_t *guid, char *str, size_t maxLen);
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protected:
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volatile int32_t mEnabled; // enable state
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int32_t mSessionId; // audio session ID
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int32_t mPriority; // priority for effect control
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status_t mStatus; // effect status
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effect_callback_t mCbf; // callback function for status, control and
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// parameter changes notifications
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void* mUserData; // client context for callback function
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effect_descriptor_t mDescriptor; // effect descriptor
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int32_t mId; // system wide unique effect engine instance ID
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private:
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// Implements the IEffectClient interface
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class EffectClient : public android::BnEffectClient, public android::IBinder::DeathRecipient
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{
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public:
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EffectClient(AudioEffect *effect) : mEffect(effect){}
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// IEffectClient
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virtual void controlStatusChanged(bool controlGranted) {
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mEffect->controlStatusChanged(controlGranted);
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}
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virtual void enableStatusChanged(bool enabled) {
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mEffect->enableStatusChanged(enabled);
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}
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virtual void commandExecuted(uint32_t cmdCode,
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uint32_t cmdSize,
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void *pCmdData,
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uint32_t replySize,
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void *pReplyData) {
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mEffect->commandExecuted(cmdCode, cmdSize, pCmdData, replySize, pReplyData);
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}
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// IBinder::DeathRecipient
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virtual void binderDied(const wp<IBinder>& who) {mEffect->binderDied();}
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private:
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AudioEffect *mEffect;
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};
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friend class EffectClient;
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// IEffectClient
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void controlStatusChanged(bool controlGranted);
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void enableStatusChanged(bool enabled);
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void commandExecuted(uint32_t cmdCode,
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uint32_t cmdSize,
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void *pCmdData,
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uint32_t replySize,
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void *pReplyData);
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void binderDied();
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sp<IEffect> mIEffect; // IEffect binder interface
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sp<EffectClient> mIEffectClient; // IEffectClient implementation
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sp<IMemory> mCblkMemory; // shared memory for deferred parameter setting
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effect_param_cblk_t* mCblk; // control block for deferred parameter setting
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};
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}; // namespace android
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#endif // ANDROID_AUDIOEFFECT_H
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