audio/effect/6.0/IEffect.hal

/*
 * Copyright (C) 2019 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.
 */

package android.hardware.audio.effect@6.0;

import android.hardware.audio.common@6.0;
import IEffectBufferProviderCallback;

interface IEffect {
    /**
     * Initialize effect engine--all configurations return to default.
     *
     * @return retval operation completion status.
     */
    @entry
    init() generates (Result retval);

    /**
     * Apply new audio parameters configurations for input and output buffers.
     * The provider callbacks may be empty, but in this case the buffer
     * must be provided in the EffectConfig structure.
     *
     * @param config configuration descriptor.
     * @param inputBufferProvider optional buffer provider reference.
     * @param outputBufferProvider optional buffer provider reference.
     * @return retval operation completion status.
     */
    setConfig(EffectConfig config,
            IEffectBufferProviderCallback inputBufferProvider,
            IEffectBufferProviderCallback outputBufferProvider)
            generates (Result retval);

    /**
     * Reset the effect engine. Keep configuration but resets state and buffer
     * content.
     *
     * @return retval operation completion status.
     */
    reset() generates (Result retval);

    /**
     * Enable processing.
     *
     * @return retval operation completion status.
     */
    @callflow(next={"prepareForProcessing"})
    enable() generates (Result retval);

    /**
     * Disable processing.
     *
     * @return retval operation completion status.
     */
    @callflow(next={"close"})
    disable() generates (Result retval);

    /**
     * Set the rendering device the audio output path is connected to.  The
     * effect implementation must set EFFECT_FLAG_DEVICE_IND flag in its
     * descriptor to receive this command when the device changes.
     *
     * Note: this method is only supported for effects inserted into
     *       the output chain.
     *
     * @param device output device specification.
     * @return retval operation completion status.
     */
    setDevice(bitfield<AudioDevice> device) generates (Result retval);

    /**
     * Set and get volume. Used by audio framework to delegate volume control to
     * effect engine. The effect implementation must set EFFECT_FLAG_VOLUME_CTRL
     * flag in its descriptor to receive this command. The effect engine must
     * return the volume that should be applied before the effect is
     * processed. The overall volume (the volume actually applied by the effect
     * engine multiplied by the returned value) should match the value indicated
     * in the command.
     *
     * @param volumes vector containing volume for each channel defined in
     *                EffectConfig for output buffer expressed in 8.24 fixed
     *                point format.
     * @return result updated volume values.
     * @return retval operation completion status.
     */
    setAndGetVolume(vec<uint32_t> volumes)
            generates (Result retval, vec<uint32_t> result);

    /**
     * Notify the effect of the volume change. The effect implementation must
     * set EFFECT_FLAG_VOLUME_IND flag in its descriptor to receive this
     * command.
     *
     * @param volumes vector containing volume for each channel defined in
     *                EffectConfig for output buffer expressed in 8.24 fixed
     *                point format.
     * @return retval operation completion status.
     */
    volumeChangeNotification(vec<uint32_t> volumes)
            generates (Result retval);

    /**
     * Set the audio mode. The effect implementation must set
     * EFFECT_FLAG_AUDIO_MODE_IND flag in its descriptor to receive this command
     * when the audio mode changes.
     *
     * @param mode desired audio mode.
     * @return retval operation completion status.
     */
    setAudioMode(AudioMode mode) generates (Result retval);

    /**
     * Apply new audio parameters configurations for input and output buffers of
     * reverse stream.  An example of reverse stream is the echo reference
     * supplied to an Acoustic Echo Canceler.
     *
     * @param config configuration descriptor.
     * @param inputBufferProvider optional buffer provider reference.
     * @param outputBufferProvider optional buffer provider reference.
     * @return retval operation completion status.
     */
    setConfigReverse(EffectConfig config,
            IEffectBufferProviderCallback inputBufferProvider,
            IEffectBufferProviderCallback outputBufferProvider)
            generates (Result retval);

    /**
     * Set the capture device the audio input path is connected to. The effect
     * implementation must set EFFECT_FLAG_DEVICE_IND flag in its descriptor to
     * receive this command when the device changes.
     *
     * Note: this method is only supported for effects inserted into
     *       the input chain.
     *
     * @param device input device specification.
     * @return retval operation completion status.
     */
    setInputDevice(bitfield<AudioDevice> device) generates (Result retval);

    /**
     * Read audio parameters configurations for input and output buffers.
     *
     * @return retval operation completion status.
     * @return config configuration descriptor.
     */
    getConfig() generates (Result retval, EffectConfig config);

    /**
     * Read audio parameters configurations for input and output buffers of
     * reverse stream.
     *
     * @return retval operation completion status.
     * @return config configuration descriptor.
     */
    getConfigReverse() generates (Result retval, EffectConfig config);

    /**
     * Queries for supported combinations of main and auxiliary channels
     * (e.g. for a multi-microphone noise suppressor).
     *
     * @param maxConfigs maximum number of the combinations to return.
     * @return retval absence of the feature support is indicated using
     *                NOT_SUPPORTED code. RESULT_TOO_BIG is returned if
     *                the number of supported combinations exceeds 'maxConfigs'.
     * @return result list of configuration descriptors.
     */
    getSupportedAuxChannelsConfigs(uint32_t maxConfigs)
            generates (Result retval, vec<EffectAuxChannelsConfig> result);

    /**
     * Retrieves the current configuration of main and auxiliary channels.
     *
     * @return retval absence of the feature support is indicated using
     *                NOT_SUPPORTED code.
     * @return result configuration descriptor.
     */
    getAuxChannelsConfig()
            generates (Result retval, EffectAuxChannelsConfig result);

    /**
     * Sets the current configuration of main and auxiliary channels.
     *
     * @return retval operation completion status; absence of the feature
     *                support is indicated using NOT_SUPPORTED code.
     */
    setAuxChannelsConfig(EffectAuxChannelsConfig config)
            generates (Result retval);

    /**
     * Set the audio source the capture path is configured for (Camcorder, voice
     * recognition...).
     *
     * Note: this method is only supported for effects inserted into
     *       the input chain.
     *
     * @param source source descriptor.
     * @return retval operation completion status.
     */
    setAudioSource(AudioSource source) generates (Result retval);

    /**
     * This command indicates if the playback thread the effect is attached to
     * is offloaded or not, and updates the I/O handle of the playback thread
     * the effect is attached to.
     *
     * @param param effect offload descriptor.
     * @return retval operation completion status.
     */
    offload(EffectOffloadParameter param) generates (Result retval);

    /**
     * Returns the effect descriptor.
     *
     * @return retval operation completion status.
     * @return descriptor effect descriptor.
     */
    getDescriptor() generates (Result retval, EffectDescriptor descriptor);

    /**
     * Set up required transports for passing audio buffers to the effect.
     *
     * The transport consists of shared memory and a message queue for reporting
     * effect processing operation status. The shared memory is set up
     * separately using 'setProcessBuffers' method.
     *
     * Processing is requested by setting 'REQUEST_PROCESS' or
     * 'REQUEST_PROCESS_REVERSE' EventFlags associated with the status message
     * queue. The result of processing may be one of the following:
     *   OK if there were no errors during processing;
     *   INVALID_ARGUMENTS if audio buffers are invalid;
     *   INVALID_STATE if the engine has finished the disable phase;
     *   NOT_INITIALIZED if the audio buffers were not set;
     *   NOT_SUPPORTED if the requested processing type is not supported by
     *                 the effect.
     *
     * @return retval OK if both message queues were created successfully.
     *                INVALID_STATE if the method was already called.
     *                INVALID_ARGUMENTS if there was a problem setting up
     *                                  the queue.
     * @return statusMQ a message queue used for passing status from the effect.
     */
    @callflow(next={"setProcessBuffers"})
    prepareForProcessing() generates (Result retval, fmq_sync<Result> statusMQ);

    /**
     * Set up input and output buffers for processing audio data. The effect
     * may modify both the input and the output buffer during the operation.
     * Buffers may be set multiple times during effect lifetime.
     *
     * The input and the output buffer may be reused between different effects,
     * and the input buffer may be used as an output buffer. Buffers are
     * distinguished using 'AudioBuffer.id' field.
     *
     * @param inBuffer input audio buffer.
     * @param outBuffer output audio buffer.
     * @return retval OK if both buffers were mapped successfully.
     *                INVALID_ARGUMENTS if there was a problem with mapping
     *                                  any of the buffers.
     */
    setProcessBuffers(AudioBuffer inBuffer, AudioBuffer outBuffer)
            generates (Result retval);

    /**
     * Execute a vendor specific command on the effect. The command code
     * and data, as well as result data are not interpreted by Android
     * Framework and are passed as-is between the application and the effect.
     *
     * The effect must use standard POSIX.1-2001 error codes for the operation
     * completion status.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it. This method only works for effects
     * implemented in software.
     *
     * @param commandId the ID of the command.
     * @param data command data.
     * @param resultMaxSize maximum size in bytes of the result; can be 0.
     * @return status command completion status.
     * @return result result data.
     */
    command(uint32_t commandId, vec<uint8_t> data, uint32_t resultMaxSize)
            generates (int32_t status, vec<uint8_t> result);

    /**
     * Set a vendor-specific parameter and apply it immediately. The parameter
     * code and data are not interpreted by Android Framework and are passed
     * as-is between the application and the effect.
     *
     * The effect must use INVALID_ARGUMENTS return code if the parameter ID is
     * unknown or if provided parameter data is invalid. If the effect does not
     * support setting vendor-specific parameters, it must return NOT_SUPPORTED.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it. This method only works for effects
     * implemented in software.
     *
     * @param parameter identifying data of the parameter.
     * @param value the value of the parameter.
     * @return retval operation completion status.
     */
    setParameter(vec<uint8_t> parameter, vec<uint8_t> value)
            generates (Result retval);

    /**
     * Get a vendor-specific parameter value. The parameter code and returned
     * data are not interpreted by Android Framework and are passed as-is
     * between the application and the effect.
     *
     * The effect must use INVALID_ARGUMENTS return code if the parameter ID is
     * unknown. If the effect does not support setting vendor-specific
     * parameters, it must return NOT_SUPPORTED.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it.  This method only works for effects
     * implemented in software.
     *
     * @param parameter identifying data of the parameter.
     * @param valueMaxSize maximum size in bytes of the value.
     * @return retval operation completion status.
     * @return result the value of the parameter.
     */
    getParameter(vec<uint8_t> parameter, uint32_t valueMaxSize)
            generates (Result retval, vec<uint8_t> value);

    /**
     * Get supported configs for a vendor-specific feature. The configs returned
     * are not interpreted by Android Framework and are passed as-is between the
     * application and the effect.
     *
     * The effect must use INVALID_ARGUMENTS return code if the feature ID is
     * unknown. If the effect does not support getting vendor-specific feature
     * configs, it must return NOT_SUPPORTED. If the feature is supported but
     * the total number of supported configurations exceeds the maximum number
     * indicated by the caller, the method must return RESULT_TOO_BIG.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it.  This method only works for effects
     * implemented in software.
     *
     * @param featureId feature identifier.
     * @param maxConfigs maximum number of configs to return.
     * @param configSize size of each config in bytes.
     * @return retval operation completion status.
     * @return configsCount number of configs returned.
     * @return configsData data for all the configs returned.
     */
    getSupportedConfigsForFeature(
            uint32_t featureId,
            uint32_t maxConfigs,
            uint32_t configSize) generates (
                    Result retval,
                    uint32_t configsCount,
                    vec<uint8_t> configsData);

    /**
     * Get the current config for a vendor-specific feature. The config returned
     * is not interpreted by Android Framework and is passed as-is between the
     * application and the effect.
     *
     * The effect must use INVALID_ARGUMENTS return code if the feature ID is
     * unknown. If the effect does not support getting vendor-specific
     * feature configs, it must return NOT_SUPPORTED.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it.  This method only works for effects
     * implemented in software.
     *
     * @param featureId feature identifier.
     * @param configSize size of the config in bytes.
     * @return retval operation completion status.
     * @return configData config data.
     */
    getCurrentConfigForFeature(uint32_t featureId, uint32_t configSize)
            generates (Result retval, vec<uint8_t> configData);

    /**
     * Set the current config for a vendor-specific feature. The config data
     * is not interpreted by Android Framework and is passed as-is between the
     * application and the effect.
     *
     * The effect must use INVALID_ARGUMENTS return code if the feature ID is
     * unknown. If the effect does not support getting vendor-specific
     * feature configs, it must return NOT_SUPPORTED.
     *
     * Use this method only if the effect is provided by a third party, and
     * there is no interface defined for it.  This method only works for effects
     * implemented in software.
     *
     * @param featureId feature identifier.
     * @param configData config data.
     * @return retval operation completion status.
     */
    setCurrentConfigForFeature(uint32_t featureId, vec<uint8_t> configData)
            generates (Result retval);

    /**
     * Called by the framework to deinitialize the effect and free up
     * all currently allocated resources. It is recommended to close
     * the effect on the client side as soon as it is becomes unused.
     *
     * The client must ensure that this function is not called while
     * audio data is being transferred through the effect's message queues.
     *
     * @return retval OK in case the success.
     *                INVALID_STATE if the effect was already closed.
     */
    @exit
    close() generates (Result retval);
};