1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/omx/AudioOutput.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,114 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/*
1.7 + * Copyright (c) 2014 The Linux Foundation. All rights reserved.
1.8 + * Copyright (C) 2008 The Android Open Source Project
1.9 + *
1.10 + * Licensed under the Apache License, Version 2.0 (the "License");
1.11 + * you may not use this file except in compliance with the License.
1.12 + * You may obtain a copy of the License at
1.13 + *
1.14 + * http://www.apache.org/licenses/LICENSE-2.0
1.15 + *
1.16 + * Unless required by applicable law or agreed to in writing, software
1.17 + * distributed under the License is distributed on an "AS IS" BASIS,
1.18 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.19 + * See the License for the specific language governing permissions and
1.20 + * limitations under the License.
1.21 + */
1.22 +
1.23 +#ifndef AUDIOOUTPUT_H_
1.24 +#define AUDIOOUTPUT_H_
1.25 +
1.26 +#include <stagefright/foundation/ABase.h>
1.27 +#include <utils/Mutex.h>
1.28 +#include <AudioTrack.h>
1.29 +
1.30 +#include "AudioSink.h"
1.31 +
1.32 +#define LOG_TAG "AudioOffloadPlayer"
1.33 +
1.34 +namespace mozilla {
1.35 +
1.36 +/**
1.37 + * Stripped version of Android KK MediaPlayerService::AudioOutput class
1.38 + * Android MediaPlayer uses AudioOutput as a wrapper to handle
1.39 + * Android::AudioTrack
1.40 + * Similarly to ease handling offloaded tracks, part of AudioOutput is used here
1.41 + */
1.42 +class AudioOutput : public AudioSink
1.43 +{
1.44 + typedef android::Mutex Mutex;
1.45 + typedef android::String8 String8;
1.46 + typedef android::status_t status_t;
1.47 + typedef android::AudioTrack AudioTrack;
1.48 +
1.49 + class CallbackData;
1.50 +
1.51 +public:
1.52 + AudioOutput(int aSessionId, int aUid);
1.53 + virtual ~AudioOutput();
1.54 +
1.55 + virtual ssize_t FrameSize() const;
1.56 + virtual status_t GetPosition(uint32_t* aPosition) const;
1.57 + virtual status_t SetVolume(float aVolume) const;
1.58 + virtual status_t SetParameters(const String8& aKeyValuePairs);
1.59 +
1.60 + // Creates an offloaded audio track with the given parameters
1.61 + // TODO: Try to recycle audio tracks instead of creating new audio tracks
1.62 + // every time
1.63 + virtual status_t Open(uint32_t aSampleRate,
1.64 + int aChannelCount,
1.65 + audio_channel_mask_t aChannelMask,
1.66 + audio_format_t aFormat,
1.67 + AudioCallback aCb,
1.68 + void* aCookie,
1.69 + audio_output_flags_t aFlags = AUDIO_OUTPUT_FLAG_NONE,
1.70 + const audio_offload_info_t* aOffloadInfo = nullptr);
1.71 +
1.72 + virtual status_t Start();
1.73 + virtual void Stop();
1.74 + virtual void Flush();
1.75 + virtual void Pause();
1.76 + virtual void Close();
1.77 +
1.78 +private:
1.79 + static void CallbackWrapper(int aEvent, void* aMe, void* aInfo);
1.80 +
1.81 + android::sp<AudioTrack> mTrack;
1.82 + void* mCallbackCookie;
1.83 + AudioCallback mCallback;
1.84 + CallbackData* mCallbackData;
1.85 +
1.86 + // Uid of the current process, need to create audio track
1.87 + int mUid;
1.88 +
1.89 + // Session id given by Android::AudioSystem and used to create audio track
1.90 + int mSessionId;
1.91 +
1.92 + // CallbackData is what is passed to the AudioTrack as the "user" data.
1.93 + // We need to be able to target this to a different Output on the fly,
1.94 + // so we can't use the Output itself for this.
1.95 + class CallbackData
1.96 + {
1.97 + public:
1.98 + CallbackData(AudioOutput* aCookie)
1.99 + {
1.100 + mData = aCookie;
1.101 + }
1.102 + AudioOutput* GetOutput() { return mData;}
1.103 + void SetOutput(AudioOutput* aNewcookie) { mData = aNewcookie; }
1.104 + // Lock/Unlock are used by the callback before accessing the payload of
1.105 + // this object
1.106 + void Lock() { mLock.lock(); }
1.107 + void Unlock() { mLock.unlock(); }
1.108 + private:
1.109 + AudioOutput* mData;
1.110 + mutable Mutex mLock;
1.111 + DISALLOW_EVIL_CONSTRUCTORS(CallbackData);
1.112 + };
1.113 +}; // AudioOutput
1.114 +
1.115 +} // namespace mozilla
1.116 +
1.117 +#endif /* AUDIOOUTPUT_H_ */
