| /* |
| * Copyright (C) 2018 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_PATCH_BUILDER_H |
| #define ANDROID_PATCH_BUILDER_H |
| |
| #include <functional> |
| #include <utility> |
| |
| #include <system/audio.h> |
| #include <utils/StrongPointer.h> |
| |
| // This is a header-only utility. |
| |
| namespace android { |
| |
| class PatchBuilder { |
| public: |
| using mix_usecase_t = decltype(audio_port_config_mix_ext::usecase); |
| |
| PatchBuilder() = default; |
| |
| // All existing methods operating on audio patches take a pointer to const. |
| // It's OK to construct a temporary PatchBuilder while preparing a parameter |
| // to such a function because the Builder will be kept alive until the code |
| // execution reaches the function call statement semicolon. |
| const struct audio_patch* patch() const { return &mPatch; } |
| |
| template<typename T, typename... S> |
| PatchBuilder& addSink(T&& t, S&&... s) { |
| sinks().add(std::forward<T>(t), std::forward<S>(s)...); |
| return *this; |
| } |
| // Explicit type of the second parameter allows clients to provide the struct inline. |
| template<typename T> |
| PatchBuilder& addSink(T&& t, const mix_usecase_t& update) { |
| sinks().add(std::forward<T>(t), update); |
| return *this; |
| } |
| template<typename T, typename... S> |
| PatchBuilder& addSource(T&& t, S&&... s) { |
| sources().add(std::forward<T>(t), std::forward<S>(s)...); |
| return *this; |
| } |
| // Explicit type of the second parameter allows clients to provide the struct inline. |
| template<typename T> |
| PatchBuilder& addSource(T&& t, const mix_usecase_t& update) { |
| sources().add(std::forward<T>(t), update); |
| return *this; |
| } |
| |
| private: |
| struct PortCfgs { |
| PortCfgs(unsigned int *countPtr, struct audio_port_config *portCfgs) |
| : mCountPtr(countPtr), mPortCfgs(portCfgs) {} |
| audio_port_config& add(const audio_port_config& portCfg) { |
| return *advance() = portCfg; |
| } |
| template<typename T> |
| audio_port_config& add(const sp<T>& entity) { |
| audio_port_config* added = advance(); |
| entity->toAudioPortConfig(added); |
| return *added; |
| } |
| template<typename T> |
| void add(const sp<T>& entity, const mix_usecase_t& usecaseUpdate) { |
| add(entity).ext.mix.usecase = usecaseUpdate; |
| } |
| template<typename T> |
| void add(const sp<T>& entity, |
| std::function<mix_usecase_t(const mix_usecase_t&)> usecaseUpdater) { |
| mix_usecase_t* usecase = &add(entity).ext.mix.usecase; |
| *usecase = usecaseUpdater(*usecase); |
| } |
| struct audio_port_config* advance() { |
| return &mPortCfgs[(*mCountPtr)++]; |
| } |
| unsigned int *mCountPtr; |
| struct audio_port_config *mPortCfgs; |
| }; |
| |
| PortCfgs sinks() { return PortCfgs(&mPatch.num_sinks, mPatch.sinks); } |
| PortCfgs sources() { return PortCfgs(&mPatch.num_sources, mPatch.sources); } |
| |
| struct audio_patch mPatch = {}; |
| }; |
| |
| } // namespace android |
| |
| #endif // ANDROID_PATCH_BUILDER_H |