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      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 "JpegCompressor.h"
     25 #include <assert.h>
     26 #include <cutils/log.h>
     27 #include <dlfcn.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);
     41 typedef void (*CleanupFunc)(JpegStub* stub);
     42 typedef int (*CompressFunc)(JpegStub* stub, const void* image, int width,
     43                             int height, int quality, ExifData* exifData);
     44 typedef void (*GetCompressedImageFunc)(JpegStub* stub, void* buff);
     45 typedef size_t (*GetCompressedSizeFunc)(JpegStub* stub);
     46 
     47 NV21JpegCompressor::NV21JpegCompressor() {
     48   if (mDl == NULL) {
     49     mDl = dlopen("/vendor/lib/hw/camera.vsoc.jpeg.so", RTLD_NOW);
     50   }
     51   if (mDl == NULL) {
     52     mDl = dlopen("/system/lib/hw/camera.vsoc.jpeg.so", RTLD_NOW);
     53   }
     54   assert(mDl != NULL);
     55 
     56   InitFunc f = (InitFunc)getSymbol(mDl, "JpegStub_init");
     57   (*f)(&mStub);
     58 }
     59 
     60 NV21JpegCompressor::~NV21JpegCompressor() {
     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                                               ExifData* exifData,
     71                                               int quality,
     72                                               int width,
     73                                               int height) {
     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, exifData);
     78 }
     79 
     80 size_t NV21JpegCompressor::getCompressedSize() {
     81   GetCompressedSizeFunc f =
     82       (GetCompressedSizeFunc)getSymbol(mDl, "JpegStub_getCompressedSize");
     83   return (*f)(&mStub);
     84 }
     85 
     86 void NV21JpegCompressor::getCompressedImage(void* buff) {
     87   GetCompressedImageFunc f =
     88       (GetCompressedImageFunc)getSymbol(mDl, "JpegStub_getCompressedImage");
     89   (*f)(&mStub, buff);
     90 }
     91 
     92 }; /* namespace android */
     93