163 lines
4.8 KiB
C++
163 lines
4.8 KiB
C++
/*
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* Copyright 2013 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 SCREENRECORD_OVERLAY_H
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#define SCREENRECORD_OVERLAY_H
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#include "Program.h"
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#include "TextRenderer.h"
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#include "EglWindow.h"
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#include <gui/BufferQueue.h>
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#include <gui/GLConsumer.h>
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#include <utils/Thread.h>
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#include <EGL/egl.h>
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namespace android {
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/*
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* Overlay "filter". This sits between the virtual display and the video
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* encoder.
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*
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* Most functions run on a thread created by start().
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*/
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class Overlay : public GLConsumer::FrameAvailableListener, Thread {
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public:
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Overlay(bool monotonicTimestamps) : Thread(false),
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mThreadResult(UNKNOWN_ERROR),
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mState(UNINITIALIZED),
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mFrameAvailable(false),
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mExtTextureName(0),
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mStartMonotonicNsecs(0),
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mStartRealtimeNsecs(0),
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mLastFrameNumber(-1),
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mTotalDroppedFrames(0),
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mUseMonotonicTimestamps(monotonicTimestamps)
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{}
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// Creates a thread that performs the overlay. Pass in the surface that
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// output will be sent to.
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//
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// This creates a dedicated thread for processing frames.
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//
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// Returns a reference to the producer side of a new BufferQueue that will
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// be used by the virtual display.
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status_t start(const sp<IGraphicBufferProducer>& outputSurface,
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sp<IGraphicBufferProducer>* pBufferProducer);
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// Stops the thread and releases resources. It's okay to call this even
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// if start() was never called.
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status_t stop();
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// This creates an EGL context and window surface, draws some informative
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// text on it, swaps the buffer, and then tears the whole thing down.
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static status_t drawInfoPage(const sp<IGraphicBufferProducer>& outputSurface);
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private:
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Overlay(const Overlay&);
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Overlay& operator=(const Overlay&);
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// Destruction via RefBase.
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virtual ~Overlay() { assert(mState == UNINITIALIZED || mState == STOPPED); }
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// Draw the initial info screen.
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static void doDrawInfoPage(const EglWindow& window,
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const Program& texRender, TextRenderer& textRenderer);
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// (overrides GLConsumer::FrameAvailableListener method)
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virtual void onFrameAvailable(const BufferItem& item);
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// (overrides Thread method)
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virtual bool threadLoop();
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// One-time setup (essentially object construction on the overlay thread).
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status_t setup_l();
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// Release all resources held.
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void release_l();
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// Release EGL display, context, surface.
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void eglRelease_l();
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// Process a frame received from the virtual display.
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void processFrame_l();
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// Convert a monotonic time stamp into a string with the current time.
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void getTimeString_l(nsecs_t monotonicNsec, char* buf, size_t bufLen);
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// Guards all fields below.
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Mutex mMutex;
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// Initialization gate.
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Condition mStartCond;
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// Thread status, mostly useful during startup.
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status_t mThreadResult;
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// Overlay thread state. States advance from left to right; object may
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// not be restarted.
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enum { UNINITIALIZED, INIT, RUNNING, STOPPING, STOPPED } mState;
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// Event notification. Overlay thread sleeps on this until a frame
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// arrives or it's time to shut down.
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Condition mEventCond;
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// Set by the FrameAvailableListener callback.
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bool mFrameAvailable;
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// The surface we send our output to, i.e. the video encoder's input
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// surface.
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sp<IGraphicBufferProducer> mOutputSurface;
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// Producer side of queue, passed into the virtual display.
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// The consumer end feeds into our GLConsumer.
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sp<IGraphicBufferProducer> mProducer;
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// This receives frames from the virtual display and makes them available
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// as an external texture.
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sp<GLConsumer> mGlConsumer;
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// EGL display / context / surface.
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EglWindow mEglWindow;
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// GL rendering support.
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Program mExtTexProgram;
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Program mTexProgram;
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// Text rendering.
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TextRenderer mTextRenderer;
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// External texture, updated by GLConsumer.
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GLuint mExtTextureName;
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// Start time, used to map monotonic to wall-clock time.
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nsecs_t mStartMonotonicNsecs;
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nsecs_t mStartRealtimeNsecs;
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// Used for tracking dropped frames.
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nsecs_t mLastFrameNumber;
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size_t mTotalDroppedFrames;
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bool mUseMonotonicTimestamps;
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static const char* kPropertyNames[];
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};
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}; // namespace android
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#endif /*SCREENRECORD_OVERLAY_H*/
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