blob: a6454d21a6c49d5db9b6b0f3b20eb0227564cf07
| 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 "JpegStub.h" |
| 26 | #include <utils/threads.h> |
| 27 | |
| 28 | namespace android { |
| 29 | |
| 30 | /* Encapsulates a converter between YV12, and JPEG formats. |
| 31 | */ |
| 32 | class NV21JpegCompressor |
| 33 | { |
| 34 | public: |
| 35 | /* Constructs JpegCompressor instance. */ |
| 36 | NV21JpegCompressor(); |
| 37 | /* Destructs JpegCompressor instance. */ |
| 38 | ~NV21JpegCompressor(); |
| 39 | |
| 40 | /**************************************************************************** |
| 41 | * Public API |
| 42 | ***************************************************************************/ |
| 43 | |
| 44 | public: |
| 45 | /* Compresses raw NV21 image into a JPEG. |
| 46 | * The compressed image will be saved in mStream member of this class. Use |
| 47 | * getCompressedSize method to obtain buffer size of the compressed image, |
| 48 | * and getCompressedImage to copy out the compressed image. |
| 49 | * Param: |
| 50 | * image - Raw NV21 image. |
| 51 | * width, height - Image dimensions. |
| 52 | * quality - JPEG quality. |
| 53 | * Return: |
| 54 | * NO_ERROR on success, or an appropriate error status. |
| 55 | * |
| 56 | */ |
| 57 | status_t compressRawImage(const void* image, |
| 58 | int width, |
| 59 | int height, |
| 60 | int quality); |
| 61 | |
| 62 | /* Get size of the compressed JPEG buffer. |
| 63 | * This method must be called only after a successful completion of |
| 64 | * compressRawImage call. |
| 65 | * Return: |
| 66 | * Size of the compressed JPEG buffer. |
| 67 | */ |
| 68 | size_t getCompressedSize(); |
| 69 | |
| 70 | /* Copies out compressed JPEG buffer. |
| 71 | * This method must be called only after a successful completion of |
| 72 | * compressRawImage call. |
| 73 | * Param: |
| 74 | * buff - Buffer where to copy the JPEG. Must be large enough to contain the |
| 75 | * entire image. |
| 76 | */ |
| 77 | void getCompressedImage(void* buff); |
| 78 | |
| 79 | /**************************************************************************** |
| 80 | * Class data |
| 81 | ***************************************************************************/ |
| 82 | |
| 83 | protected: |
| 84 | /* Strides for Y (the first element), and UV (the second one) panes. */ |
| 85 | int mStrides[2]; |
| 86 | |
| 87 | private: |
| 88 | // library handle to dlopen |
| 89 | static void* mDl; |
| 90 | JpegStub mStub; |
| 91 | }; |
| 92 | |
| 93 | }; /* namespace android */ |
| 94 | |
| 95 | #endif /* HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H */ |
| 96 |