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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 <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 */
     96