src/type3_AndroidCloud/anbox-master/android/camera/JpegCompressor.cpp

   1 /*
   2  * Copyright (C) 2011 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  * Contains implementation of a class NV21JpegCompressor that encapsulates a
  19  * converter between NV21, and JPEG formats.
  20  */
  21
  22 #define LOG_NDEBUG 0
  23 #define LOG_TAG "EmulatedCamera_JPEG"
  24 #include <cutils/log.h>
  25 #include <assert.h>
  26 #include <dlfcn.h>
  27 #include "JpegCompressor.h"
  28
  29 namespace android {
  30
  31 void* NV21JpegCompressor::mDl = NULL;
  32
  33 static void* getSymbol(void* dl, const char* signature) {
  34     void* res = dlsym(dl, signature);
  35     assert (res != NULL);
  36
  37     return res;
  38 }
  39
  40 typedef void (*InitFunc)(JpegStub* stub, int* strides);
  41 typedef void (*CleanupFunc)(JpegStub* stub);
  42 typedef int (*CompressFunc)(JpegStub* stub, const void* image,
  43         int width, int height, int quality);
  44 typedef void (*GetCompressedImageFunc)(JpegStub* stub, void* buff);
  45 typedef size_t (*GetCompressedSizeFunc)(JpegStub* stub);
  46
  47 NV21JpegCompressor::NV21JpegCompressor()
  48 {
  49     const char dlName[] = "/system/lib/hw/camera.goldfish.jpeg.so";
  50     if (mDl == NULL) {
  51         mDl = dlopen(dlName, RTLD_NOW);
  52     }
  53     assert(mDl != NULL);
  54
  55     InitFunc f = (InitFunc)getSymbol(mDl, "JpegStub_init");
  56     (*f)(&mStub, mStrides);
  57 }
  58
  59 NV21JpegCompressor::~NV21JpegCompressor()
  60 {
  61     CleanupFunc f = (CleanupFunc)getSymbol(mDl, "JpegStub_cleanup");
  62     (*f)(&mStub);
  63 }
  64
  65 /****************************************************************************
  66  * Public API
  67  ***************************************************************************/
  68
  69 status_t NV21JpegCompressor::compressRawImage(const void* image,
  70                                               int width,
  71                                               int height,
  72                                               int quality)
  73 {
  74     mStrides[0] = width;
  75     mStrides[1] = width;
  76     CompressFunc f = (CompressFunc)getSymbol(mDl, "JpegStub_compress");
  77     return (status_t)(*f)(&mStub, image, width, height, quality);
  78 }
  79
  80
  81 size_t NV21JpegCompressor::getCompressedSize()
  82 {
  83     GetCompressedSizeFunc f = (GetCompressedSizeFunc)getSymbol(mDl,
  84             "JpegStub_getCompressedSize");
  85     return (*f)(&mStub);
  86 }
  87
  88 void NV21JpegCompressor::getCompressedImage(void* buff)
  89 {
  90     GetCompressedImageFunc f = (GetCompressedImageFunc)getSymbol(mDl,
  91             "JpegStub_getCompressedImage");
  92     (*f)(&mStub, buff);
  93 }
  94
  95 }; /* namespace android */