зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
3.5 KiB
C++
113 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/*
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* Copyright (c) 2014 The Linux Foundation. All rights reserved.
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* Copyright (C) 2008 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 AUDIOOUTPUT_H_
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#define AUDIOOUTPUT_H_
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#include <stagefright/foundation/ABase.h>
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#include <utils/Mutex.h>
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#include <AudioTrack.h>
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#include "GonkAudioSink.h"
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namespace mozilla {
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/**
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* Stripped version of Android KK MediaPlayerService::AudioOutput class
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* Android MediaPlayer uses AudioOutput as a wrapper to handle
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* Android::AudioTrack
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* Similarly to ease handling offloaded tracks, part of AudioOutput is used here
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*/
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class AudioOutput : public GonkAudioSink
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{
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typedef android::Mutex Mutex;
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typedef android::String8 String8;
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typedef android::status_t status_t;
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typedef android::AudioTrack AudioTrack;
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class CallbackData;
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public:
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AudioOutput(int aSessionId, int aUid);
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virtual ~AudioOutput();
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virtual ssize_t FrameSize() const;
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virtual status_t GetPosition(uint32_t* aPosition) const;
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virtual status_t SetVolume(float aVolume) const;
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virtual status_t SetParameters(const String8& aKeyValuePairs);
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// Creates an offloaded audio track with the given parameters
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// TODO: Try to recycle audio tracks instead of creating new audio tracks
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// every time
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virtual status_t Open(uint32_t aSampleRate,
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int aChannelCount,
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audio_channel_mask_t aChannelMask,
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audio_format_t aFormat,
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AudioCallback aCb,
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void* aCookie,
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audio_output_flags_t aFlags = AUDIO_OUTPUT_FLAG_NONE,
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const audio_offload_info_t* aOffloadInfo = nullptr);
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virtual status_t Start();
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virtual void Stop();
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virtual void Flush();
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virtual void Pause();
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virtual void Close();
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private:
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static void CallbackWrapper(int aEvent, void* aMe, void* aInfo);
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android::sp<AudioTrack> mTrack;
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void* mCallbackCookie;
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AudioCallback mCallback;
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CallbackData* mCallbackData;
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// Uid of the current process, need to create audio track
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int mUid;
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// Session id given by Android::AudioSystem and used to create audio track
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int mSessionId;
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// CallbackData is what is passed to the AudioTrack as the "user" data.
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// We need to be able to target this to a different Output on the fly,
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// so we can't use the Output itself for this.
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class CallbackData
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{
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public:
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CallbackData(AudioOutput* aCookie)
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{
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mData = aCookie;
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}
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AudioOutput* GetOutput() { return mData;}
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void SetOutput(AudioOutput* aNewcookie) { mData = aNewcookie; }
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// Lock/Unlock are used by the callback before accessing the payload of
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// this object
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void Lock() { mLock.lock(); }
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void Unlock() { mLock.unlock(); }
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private:
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AudioOutput* mData;
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mutable Mutex mLock;
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DISALLOW_EVIL_CONSTRUCTORS(CallbackData);
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};
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}; // AudioOutput
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} // namespace mozilla
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#endif /* AUDIOOUTPUT_H_ */
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