Konsta
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
/*
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* Copyright (C) 2023 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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#pragma once
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#include <atomic>
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#include <optional>
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#include <thread>
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#include <vector>
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#include <media/nbaio/MonoPipe.h>
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#include <media/nbaio/MonoPipeReader.h>
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#include "Stream.h"
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#include "alsa/Utils.h"
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namespace aidl::android::hardware::audio::core {
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// This class is intended to be used as a base class for implementations
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// that use TinyAlsa.
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// This class does not define a complete stream implementation,
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// and should never be used on its own. Derived classes are expected to
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// provide necessary overrides for all interface methods omitted here.
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class StreamAlsa : public StreamCommonImpl {
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public:
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StreamAlsa(StreamContext* context, const Metadata& metadata, int readWriteRetries);
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~StreamAlsa();
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// Methods of 'DriverInterface'.
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::android::status_t init(DriverCallbackInterface* callback) override;
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::android::status_t drain(StreamDescriptor::DrainMode) override;
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::android::status_t flush() override;
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::android::status_t pause() override;
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::android::status_t standby() override;
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::android::status_t start() override;
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::android::status_t transfer(void* buffer, size_t frameCount, size_t* actualFrameCount,
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int32_t* latencyMs) override;
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::android::status_t refinePosition(StreamDescriptor::Position* position) override;
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void shutdown() override;
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ndk::ScopedAStatus setGain(float gain) override;
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protected:
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// Called from 'start' to initialize 'mAlsaDeviceProxies', the vector must be non-empty.
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virtual std::vector<alsa::DeviceProfile> getDeviceProfiles() = 0;
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const size_t mBufferSizeFrames;
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const size_t mFrameSizeBytes;
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const int mSampleRate;
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const bool mIsInput;
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const std::optional<struct pcm_config> mConfig;
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const int mReadWriteRetries;
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private:
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::android::NBAIO_Format getPipeFormat() const;
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::android::sp<::android::MonoPipe> makeSink(bool writeCanBlock);
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::android::sp<::android::MonoPipeReader> makeSource(::android::MonoPipe* pipe);
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void inputIoThread(size_t idx);
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void outputIoThread(size_t idx);
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void teardownIo();
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std::atomic<float> mGain = 1.0;
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// All fields below are only used on the worker thread.
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std::vector<alsa::DeviceProxy> mAlsaDeviceProxies;
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// Only 'libnbaio_mono' is vendor-accessible, thus no access to the multi-reader Pipe.
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std::vector<::android::sp<::android::MonoPipe>> mSinks;
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std::vector<::android::sp<::android::MonoPipeReader>> mSources;
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std::vector<std::thread> mIoThreads;
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std::atomic<bool> mIoThreadIsRunning = false; // used by all threads
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};
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} // namespace aidl::android::hardware::audio::core
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