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 #ifndef HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H 18 #define HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H 19 20 /* 21 * Contains declaration of a class NV21JpegCompressor that encapsulates a 22 * converter between YV21, and JPEG formats. 23 */ 24 25 #include <utils/threads.h> 26 #include "JpegStub.h" 27 28 namespace android { 29 30 /* Encapsulates a converter between YV12, and JPEG formats. 31 */ 32 class NV21JpegCompressor { 33 public: 34 /* Constructs JpegCompressor instance. */ 35 NV21JpegCompressor(); 36 /* Destructs JpegCompressor instance. */ 37 ~NV21JpegCompressor(); 38 39 /**************************************************************************** 40 * Public API 41 ***************************************************************************/ 42 43 public: 44 /* Compresses raw NV21 image into a JPEG. 45 * The compressed image will be saved in mStream member of this class. Use 46 * getCompressedSize method to obtain buffer size of the compressed image, 47 * and getCompressedImage to copy out the compressed image. 48 * Param: 49 * image - Raw NV21 image. 50 * metadata - Image metadata (dimensions, location etc). 51 * quality - JPEG quality. 52 * Return: 53 * NO_ERROR on success, or an appropriate error status. 54 * 55 */ 56 status_t compressRawImage(const void* image, ExifData* exifData, 57 int quality, int width, int height); 58 59 /* Get size of the compressed JPEG buffer. 60 * This method must be called only after a successful completion of 61 * compressRawImage call. 62 * Return: 63 * Size of the compressed JPEG buffer. 64 */ 65 size_t getCompressedSize(); 66 67 /* Copies out compressed JPEG buffer. 68 * This method must be called only after a successful completion of 69 * compressRawImage call. 70 * Param: 71 * buff - Buffer where to copy the JPEG. Must be large enough to contain the 72 * entire image. 73 */ 74 void getCompressedImage(void* buff); 75 76 /**************************************************************************** 77 * Class data 78 ***************************************************************************/ 79 80 protected: 81 /* Strides for Y (the first element), and UV (the second one) panes. */ 82 int mStrides[2]; 83 84 private: 85 // library handle to dlopen 86 static void* mDl; 87 JpegStub mStub; 88 }; 89 90 }; /* namespace android */ 91 92 #endif /* HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H */ 93