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142 lines
4.6 KiB
142 lines
4.6 KiB
/*
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* Copyright (C) 2017 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 AAUDIO_AAUDIO_SERVICE_STREAM_MMAP_H
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#define AAUDIO_AAUDIO_SERVICE_STREAM_MMAP_H
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#include <atomic>
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#include <media/audiohal/StreamHalInterface.h>
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#include <media/MmapStreamCallback.h>
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#include <media/MmapStreamInterface.h>
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#include <utils/RefBase.h>
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#include <utils/String16.h>
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#include <utils/Vector.h>
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#include "binding/AAudioServiceMessage.h"
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#include "AAudioServiceStreamBase.h"
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#include "binding/AudioEndpointParcelable.h"
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#include "SharedMemoryProxy.h"
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#include "TimestampScheduler.h"
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#include "utility/MonotonicCounter.h"
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namespace aaudio {
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/**
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* Manage one memory mapped buffer that originated from a HAL.
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*/
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class AAudioServiceStreamMMAP
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: public AAudioServiceStreamBase
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, public android::MmapStreamCallback {
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public:
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AAudioServiceStreamMMAP();
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virtual ~AAudioServiceStreamMMAP();
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aaudio_result_t open(const aaudio::AAudioStreamRequest &request,
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aaudio::AAudioStreamConfiguration &configurationOutput) override;
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/**
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* Start the flow of audio data.
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*
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* This is not guaranteed to be synchronous but it currently is.
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* An AAUDIO_SERVICE_EVENT_STARTED will be sent to the client when complete.
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*/
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aaudio_result_t start() override;
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/**
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* Stop the flow of data so that start() can resume without loss of data.
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*
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* This is not guaranteed to be synchronous but it currently is.
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* An AAUDIO_SERVICE_EVENT_PAUSED will be sent to the client when complete.
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*/
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aaudio_result_t pause() override;
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aaudio_result_t stop() override;
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/**
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* Discard any data held by the underlying HAL or Service.
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*
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* This is not guaranteed to be synchronous but it currently is.
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* An AAUDIO_SERVICE_EVENT_FLUSHED will be sent to the client when complete.
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*/
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aaudio_result_t flush() override;
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aaudio_result_t close() override;
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/**
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* Send a MMAP/NOIRQ buffer timestamp to the client.
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*/
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aaudio_result_t sendCurrentTimestamp();
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// -------------- Callback functions ---------------------
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void onTearDown() override;
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void onVolumeChanged(audio_channel_mask_t channels,
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android::Vector<float> values) override;
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void onRoutingChanged(audio_port_handle_t deviceId) override;
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protected:
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aaudio_result_t getDownDataDescription(AudioEndpointParcelable &parcelable) override;
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aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
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private:
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// This proxy class was needed to prevent a crash in AudioFlinger
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// when the stream was closed.
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class MyMmapStreamCallback : public android::MmapStreamCallback {
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public:
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explicit MyMmapStreamCallback(android::MmapStreamCallback &serviceCallback)
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: mServiceCallback(serviceCallback){}
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virtual ~MyMmapStreamCallback() = default;
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void onTearDown() override {
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mServiceCallback.onTearDown();
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};
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void onVolumeChanged(audio_channel_mask_t channels, android::Vector<float> values) override
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{
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mServiceCallback.onVolumeChanged(channels, values);
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};
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void onRoutingChanged(audio_port_handle_t deviceId) override {
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mServiceCallback.onRoutingChanged(deviceId);
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};
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private:
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android::MmapStreamCallback &mServiceCallback;
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};
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android::sp<MyMmapStreamCallback> mMmapStreamCallback;
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MonotonicCounter mFramesWritten;
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MonotonicCounter mFramesRead;
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int32_t mPreviousFrameCounter = 0; // from HAL
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int mAudioDataFileDescriptor = -1;
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// Interface to the AudioFlinger MMAP support.
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android::sp<android::MmapStreamInterface> mMmapStream;
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struct audio_mmap_buffer_info mMmapBufferinfo;
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android::MmapStreamInterface::Client mMmapClient;
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audio_port_handle_t mPortHandle = -1; // TODO review best default
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};
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} // namespace aaudio
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#endif //AAUDIO_AAUDIO_SERVICE_STREAM_MMAP_H
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