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      1 /*
      2  * Copyright 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SCREENRECORD_FRAMEOUTPUT_H
     18 #define SCREENRECORD_FRAMEOUTPUT_H
     19 
     20 #include "Program.h"
     21 #include "EglWindow.h"
     22 
     23 #include <gui/BufferQueue.h>
     24 #include <gui/GLConsumer.h>
     25 
     26 namespace android {
     27 
     28 /*
     29  * Support for "frames" output format.
     30  */
     31 class FrameOutput : public GLConsumer::FrameAvailableListener {
     32 public:
     33     FrameOutput() : mFrameAvailable(false),
     34         mExtTextureName(0),
     35         mPixelBuf(NULL)
     36         {}
     37 
     38     // Create an "input surface", similar in purpose to a MediaCodec input
     39     // surface, that the virtual display can send buffers to.  Also configures
     40     // EGL with a pbuffer surface on the current thread.
     41     status_t createInputSurface(int width, int height,
     42             sp<IGraphicBufferProducer>* pBufferProducer);
     43 
     44     // Copy one from input to output.  If no frame is available, this will wait up to the
     45     // specified number of microseconds.
     46     //
     47     // Returns ETIMEDOUT if the timeout expired before we found a frame.
     48     status_t copyFrame(FILE* fp, long timeoutUsec, bool rawFrames);
     49 
     50     // Prepare to copy frames.  Makes the EGL context used by this object current.
     51     void prepareToCopy() {
     52         mEglWindow.makeCurrent();
     53     }
     54 
     55 private:
     56     FrameOutput(const FrameOutput&);
     57     FrameOutput& operator=(const FrameOutput&);
     58 
     59     // Destruction via RefBase.
     60     virtual ~FrameOutput() {
     61         delete[] mPixelBuf;
     62     }
     63 
     64     // (overrides GLConsumer::FrameAvailableListener method)
     65     virtual void onFrameAvailable(const BufferItem& item);
     66 
     67     // Reduces RGBA to RGB, in place.
     68     static void reduceRgbaToRgb(uint8_t* buf, unsigned int pixelCount);
     69 
     70     // Put a 32-bit value into a buffer, in little-endian byte order.
     71     static void setValueLE(uint8_t* buf, uint32_t value);
     72 
     73     // Used to wait for the FrameAvailableListener callback.
     74     Mutex mMutex;
     75     Condition mEventCond;
     76 
     77     // Set by the FrameAvailableListener callback.
     78     bool mFrameAvailable;
     79 
     80     // This receives frames from the virtual display and makes them available
     81     // as an external texture.
     82     sp<GLConsumer> mGlConsumer;
     83 
     84     // EGL display / context / surface.
     85     EglWindow mEglWindow;
     86 
     87     // GL rendering support.
     88     Program mExtTexProgram;
     89 
     90     // External texture, updated by GLConsumer.
     91     GLuint mExtTextureName;
     92 
     93     // Pixel data buffer.
     94     uint8_t* mPixelBuf;
     95 };
     96 
     97 }; // namespace android
     98 
     99 #endif /*SCREENRECORD_FRAMEOUTPUT_H*/
    100