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188 lines
7.5 KiB
188 lines
7.5 KiB
/*
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**
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** Copyright 2012, 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 INCLUDING_FROM_AUDIOFLINGER_H
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#error This header file should only be included from AudioFlinger.h
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#endif
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// base for record and playback
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class TrackBase : public ExtendedAudioBufferProvider, public RefBase {
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public:
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enum track_state {
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IDLE,
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FLUSHED,
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STOPPED,
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// next 2 states are currently used for fast tracks
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// and offloaded tracks only
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STOPPING_1, // waiting for first underrun
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STOPPING_2, // waiting for presentation complete
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RESUMING,
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ACTIVE,
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PAUSING,
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PAUSED,
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STARTING_1, // for RecordTrack only
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STARTING_2, // for RecordTrack only
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};
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// where to allocate the data buffer
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enum alloc_type {
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ALLOC_CBLK, // allocate immediately after control block
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ALLOC_READONLY, // allocate from a separate read-only heap per thread
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ALLOC_PIPE, // do not allocate; use the pipe buffer
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ALLOC_LOCAL, // allocate a local buffer
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ALLOC_NONE, // do not allocate:use the buffer passed to TrackBase constructor
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};
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enum track_type {
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TYPE_DEFAULT,
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TYPE_OUTPUT,
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TYPE_PATCH,
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};
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TrackBase(ThreadBase *thread,
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const sp<Client>& client,
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uint32_t sampleRate,
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audio_format_t format,
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audio_channel_mask_t channelMask,
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size_t frameCount,
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void *buffer,
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audio_session_t sessionId,
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uid_t uid,
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bool isOut,
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alloc_type alloc = ALLOC_CBLK,
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track_type type = TYPE_DEFAULT,
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audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE);
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virtual ~TrackBase();
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virtual status_t initCheck() const;
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virtual status_t start(AudioSystem::sync_event_t event,
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audio_session_t triggerSession) = 0;
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virtual void stop() = 0;
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sp<IMemory> getCblk() const { return mCblkMemory; }
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audio_track_cblk_t* cblk() const { return mCblk; }
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audio_session_t sessionId() const { return mSessionId; }
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uid_t uid() const { return mUid; }
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audio_port_handle_t portId() const { return mPortId; }
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virtual status_t setSyncEvent(const sp<SyncEvent>& event);
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sp<IMemory> getBuffers() const { return mBufferMemory; }
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void* buffer() const { return mBuffer; }
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virtual bool isFastTrack() const = 0;
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bool isOutputTrack() const { return (mType == TYPE_OUTPUT); }
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bool isPatchTrack() const { return (mType == TYPE_PATCH); }
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bool isExternalTrack() const { return !isOutputTrack() && !isPatchTrack(); }
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virtual void invalidate() { mIsInvalid = true; }
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bool isInvalid() const { return mIsInvalid; }
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protected:
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TrackBase(const TrackBase&);
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TrackBase& operator = (const TrackBase&);
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// AudioBufferProvider interface
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virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer) = 0;
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virtual void releaseBuffer(AudioBufferProvider::Buffer* buffer);
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// ExtendedAudioBufferProvider interface is only needed for Track,
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// but putting it in TrackBase avoids the complexity of virtual inheritance
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virtual size_t framesReady() const { return SIZE_MAX; }
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audio_format_t format() const { return mFormat; }
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uint32_t channelCount() const { return mChannelCount; }
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audio_channel_mask_t channelMask() const { return mChannelMask; }
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virtual uint32_t sampleRate() const { return mSampleRate; }
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bool isStopped() const {
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return (mState == STOPPED || mState == FLUSHED);
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}
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// for fast tracks and offloaded tracks only
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bool isStopping() const {
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return mState == STOPPING_1 || mState == STOPPING_2;
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}
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bool isStopping_1() const {
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return mState == STOPPING_1;
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}
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bool isStopping_2() const {
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return mState == STOPPING_2;
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}
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bool isTerminated() const {
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return mTerminated;
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}
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void terminate() {
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mTerminated = true;
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}
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bool isOut() const { return mIsOut; }
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// true for Track, false for RecordTrack,
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// this could be a track type if needed later
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const wp<ThreadBase> mThread;
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/*const*/ sp<Client> mClient; // see explanation at ~TrackBase() why not const
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sp<IMemory> mCblkMemory;
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audio_track_cblk_t* mCblk;
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sp<IMemory> mBufferMemory; // currently non-0 for fast RecordTrack only
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void* mBuffer; // start of track buffer, typically in shared memory
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// except for OutputTrack when it is in local memory
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// we don't really need a lock for these
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track_state mState;
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const uint32_t mSampleRate; // initial sample rate only; for tracks which
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// support dynamic rates, the current value is in control block
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const audio_format_t mFormat;
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const audio_channel_mask_t mChannelMask;
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const uint32_t mChannelCount;
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const size_t mFrameSize; // AudioFlinger's view of frame size in shared memory,
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// where for AudioTrack (but not AudioRecord),
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// 8-bit PCM samples are stored as 16-bit
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const size_t mFrameCount;// size of track buffer given at createTrack() or
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// openRecord(), and then adjusted as needed
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const audio_session_t mSessionId;
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uid_t mUid;
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Vector < sp<SyncEvent> >mSyncEvents;
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const bool mIsOut;
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sp<ServerProxy> mServerProxy;
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const int mId;
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sp<NBAIO_Sink> mTeeSink;
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sp<NBAIO_Source> mTeeSource;
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bool mTerminated;
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track_type mType; // must be one of TYPE_DEFAULT, TYPE_OUTPUT, TYPE_PATCH ...
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audio_io_handle_t mThreadIoHandle; // I/O handle of the thread the track is attached to
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audio_port_handle_t mPortId; // unique ID for this track used by audio policy
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bool mIsInvalid; // non-resettable latch, set by invalidate()
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};
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// PatchProxyBufferProvider interface is implemented by PatchTrack and PatchRecord.
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// it provides buffer access methods that map those of a ClientProxy (see AudioTrackShared.h)
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class PatchProxyBufferProvider
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{
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public:
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virtual ~PatchProxyBufferProvider() {}
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virtual status_t obtainBuffer(Proxy::Buffer* buffer,
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const struct timespec *requested = NULL) = 0;
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virtual void releaseBuffer(Proxy::Buffer* buffer) = 0;
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};
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