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      1 /*
      2  * Copyright (C) 2012 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 
     18 /**
     19  * This class simulates a hardware JPEG compressor.  It receives image buffers
     20  * in RGBA_8888 format, processes them in a worker thread, and then pushes them
     21  * out to their destination stream.
     22  */
     23 
     24 #ifndef HW_EMULATOR_CAMERA2_JPEG_H
     25 #define HW_EMULATOR_CAMERA2_JPEG_H
     26 
     27 #include "utils/Thread.h"
     28 #include "utils/Mutex.h"
     29 #include "utils/Timers.h"
     30 
     31 #include "Base.h"
     32 
     33 #include <stdio.h>
     34 
     35 extern "C" {
     36 #include <jpeglib.h>
     37 }
     38 
     39 namespace android {
     40 
     41 class EmulatedFakeCamera2;
     42 
     43 class JpegCompressor: private Thread, public virtual RefBase {
     44   public:
     45 
     46     JpegCompressor(EmulatedFakeCamera2 *parent);
     47     ~JpegCompressor();
     48 
     49     // Start compressing COMPRESSED format buffers; JpegCompressor takes
     50     // ownership of the Buffers vector.
     51     status_t start(Buffers *buffers,
     52             nsecs_t captureTime);
     53 
     54     status_t cancel();
     55 
     56     bool isBusy();
     57     bool isStreamInUse(uint32_t id);
     58 
     59     bool waitForDone(nsecs_t timeout);
     60 
     61     // TODO: Measure this
     62     static const size_t kMaxJpegSize = 300000;
     63 
     64   private:
     65     Mutex mBusyMutex;
     66     bool mIsBusy;
     67     Condition mDone;
     68 
     69     Mutex mMutex;
     70 
     71     EmulatedFakeCamera2 *mParent;
     72 
     73     Buffers *mBuffers;
     74     nsecs_t mCaptureTime;
     75 
     76     StreamBuffer mJpegBuffer, mAuxBuffer;
     77     bool mFoundJpeg, mFoundAux;
     78 
     79     jpeg_compress_struct mCInfo;
     80 
     81     struct JpegError : public jpeg_error_mgr {
     82         JpegCompressor *parent;
     83     };
     84     j_common_ptr mJpegErrorInfo;
     85 
     86     struct JpegDestination : public jpeg_destination_mgr {
     87         JpegCompressor *parent;
     88     };
     89 
     90     static void jpegErrorHandler(j_common_ptr cinfo);
     91 
     92     static void jpegInitDestination(j_compress_ptr cinfo);
     93     static boolean jpegEmptyOutputBuffer(j_compress_ptr cinfo);
     94     static void jpegTermDestination(j_compress_ptr cinfo);
     95 
     96     bool checkError(const char *msg);
     97     void cleanUp();
     98 
     99     /**
    100      * Inherited Thread virtual overrides
    101      */
    102   private:
    103     virtual status_t readyToRun();
    104     virtual bool threadLoop();
    105 };
    106 
    107 } // namespace android
    108 
    109 #endif
    110