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
29namespace android {
30
31void* NV21JpegCompressor::mDl = NULL;
32
33static void* getSymbol(void* dl, const char* signature) {
34    void* res = dlsym(dl, signature);
35    assert (res != NULL);
36
37    return res;
38}
39
40typedef void (*InitFunc)(JpegStub* stub);
41typedef void (*CleanupFunc)(JpegStub* stub);
42typedef int (*CompressFunc)(JpegStub* stub, const void* image,
43        int width, int height, int quality, ExifData* exifData);
44typedef void (*GetCompressedImageFunc)(JpegStub* stub, void* buff);
45typedef size_t (*GetCompressedSizeFunc)(JpegStub* stub);
46
47NV21JpegCompressor::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);
57}
58
59NV21JpegCompressor::~NV21JpegCompressor()
60{
61    CleanupFunc f = (CleanupFunc)getSymbol(mDl, "JpegStub_cleanup");
62    (*f)(&mStub);
63}
64
65/****************************************************************************
66 * Public API
67 ***************************************************************************/
68
69status_t NV21JpegCompressor::compressRawImage(const void* image,
70                                              int width,
71                                              int height,
72                                              int quality,
73                                              ExifData* exifData)
74{
75    CompressFunc f = (CompressFunc)getSymbol(mDl, "JpegStub_compress");
76    return (status_t)(*f)(&mStub, image, width, height, quality, exifData);
77}
78
79
80size_t NV21JpegCompressor::getCompressedSize()
81{
82    GetCompressedSizeFunc f = (GetCompressedSizeFunc)getSymbol(mDl,
83            "JpegStub_getCompressedSize");
84    return (*f)(&mStub);
85}
86
87void NV21JpegCompressor::getCompressedImage(void* buff)
88{
89    GetCompressedImageFunc f = (GetCompressedImageFunc)getSymbol(mDl,
90            "JpegStub_getCompressedImage");
91    (*f)(&mStub, buff);
92}
93
94}; /* namespace android */
95