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Diffstat (limited to 'include/media/EffectsFactoryApi.h')
| -rw-r--r-- | include/media/EffectsFactoryApi.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/include/media/EffectsFactoryApi.h b/include/media/EffectsFactoryApi.h new file mode 100644 index 0000000..65c26f4 --- /dev/null +++ b/include/media/EffectsFactoryApi.h @@ -0,0 +1,177 @@ +/* + * 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_*/ |