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
getSymbol(void * dl,const char * signature)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,
43 int width, int height, int quality, ExifData* exifData);
44 typedef void (*GetCompressedImageFunc)(JpegStub* stub, void* buff);
45 typedef size_t (*GetCompressedSizeFunc)(JpegStub* stub);
46
NV21JpegCompressor()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);
57 }
58
~NV21JpegCompressor()59 NV21JpegCompressor::~NV21JpegCompressor()
60 {
61 CleanupFunc f = (CleanupFunc)getSymbol(mDl, "JpegStub_cleanup");
62 (*f)(&mStub);
63 }
64
65 /****************************************************************************
66 * Public API
67 ***************************************************************************/
68
compressRawImage(const void * image,int width,int height,int quality,ExifData * exifData)69 status_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
getCompressedSize()80 size_t NV21JpegCompressor::getCompressedSize()
81 {
82 GetCompressedSizeFunc f = (GetCompressedSizeFunc)getSymbol(mDl,
83 "JpegStub_getCompressedSize");
84 return (*f)(&mStub);
85 }
86
getCompressedImage(void * buff)87 void NV21JpegCompressor::getCompressedImage(void* buff)
88 {
89 GetCompressedImageFunc f = (GetCompressedImageFunc)getSymbol(mDl,
90 "JpegStub_getCompressedImage");
91 (*f)(&mStub, buff);
92 }
93
94 }; /* namespace android */
95
