/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Contains implementation of a class NV21JpegCompressor that encapsulates a
 * converter between NV21, and JPEG formats.
 */

#define LOG_NDEBUG 0
#define LOG_TAG "EmulatedCamera_JPEG"
#include "JpegCompressor.h"
#include <assert.h>
#include <cutils/log.h>
#include <dlfcn.h>

namespace android {

void* NV21JpegCompressor::mDl = NULL;

static void* getSymbol(void* dl, const char* signature) {
  void* res = dlsym(dl, signature);
  assert(res != NULL);

  return res;
}

typedef void (*InitFunc)(JpegStub* stub);
typedef void (*CleanupFunc)(JpegStub* stub);
typedef int (*CompressFunc)(JpegStub* stub, const void* image, int width,
                            int height, int quality, ExifData* exifData);
typedef void (*GetCompressedImageFunc)(JpegStub* stub, void* buff);
typedef size_t (*GetCompressedSizeFunc)(JpegStub* stub);

NV21JpegCompressor::NV21JpegCompressor() {
  if (mDl == NULL) {
    mDl = dlopen("/vendor/lib/hw/camera.vsoc.jpeg.so", RTLD_NOW);
  }
  if (mDl == NULL) {
    mDl = dlopen("/system/lib/hw/camera.vsoc.jpeg.so", RTLD_NOW);
  }
  assert(mDl != NULL);

  InitFunc f = (InitFunc)getSymbol(mDl, "JpegStub_init");
  (*f)(&mStub);
}

NV21JpegCompressor::~NV21JpegCompressor() {
  CleanupFunc f = (CleanupFunc)getSymbol(mDl, "JpegStub_cleanup");
  (*f)(&mStub);
}

/****************************************************************************
 * Public API
 ***************************************************************************/

status_t NV21JpegCompressor::compressRawImage(const void* image,
                                              ExifData* exifData,
                                              int quality,
                                              int width,
                                              int height) {
  mStrides[0] = width;
  mStrides[1] = width;
  CompressFunc f = (CompressFunc)getSymbol(mDl, "JpegStub_compress");
  return (status_t)(*f)(&mStub, image, width, height, quality, exifData);
}

size_t NV21JpegCompressor::getCompressedSize() {
  GetCompressedSizeFunc f =
      (GetCompressedSizeFunc)getSymbol(mDl, "JpegStub_getCompressedSize");
  return (*f)(&mStub);
}

void NV21JpegCompressor::getCompressedImage(void* buff) {
  GetCompressedImageFunc f =
      (GetCompressedImageFunc)getSymbol(mDl, "JpegStub_getCompressedImage");
  (*f)(&mStub, buff);
}

}; /* namespace android */