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/*
* 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.
*/
#ifndef HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H
#define HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H
/*
* Contains declaration of a class NV21JpegCompressor that encapsulates a
* converter between YV21, and JPEG formats.
*/
#include "JpegStub.h"
#include <utils/threads.h>
namespace android {
/* Encapsulates a converter between YV12, and JPEG formats.
*/
class NV21JpegCompressor
{
public:
/* Constructs JpegCompressor instance. */
NV21JpegCompressor();
/* Destructs JpegCompressor instance. */
~NV21JpegCompressor();
/****************************************************************************
* Public API
***************************************************************************/
public:
/* Compresses raw NV21 image into a JPEG.
* The compressed image will be saved in mStream member of this class. Use
* getCompressedSize method to obtain buffer size of the compressed image,
* and getCompressedImage to copy out the compressed image.
* Param:
* image - Raw NV21 image.
* width, height - Image dimensions.
* quality - JPEG quality.
* Return:
* NO_ERROR on success, or an appropriate error status.
*
*/
status_t compressRawImage(const void* image,
int width,
int height,
int quality);
/* Get size of the compressed JPEG buffer.
* This method must be called only after a successful completion of
* compressRawImage call.
* Return:
* Size of the compressed JPEG buffer.
*/
size_t getCompressedSize();
/* Copies out compressed JPEG buffer.
* This method must be called only after a successful completion of
* compressRawImage call.
* Param:
* buff - Buffer where to copy the JPEG. Must be large enough to contain the
* entire image.
*/
void getCompressedImage(void* buff);
/****************************************************************************
* Class data
***************************************************************************/
protected:
/* Strides for Y (the first element), and UV (the second one) panes. */
int mStrides[2];
private:
// library handle to dlopen
static void* mDl;
JpegStub mStub;
};
}; /* namespace android */
#endif /* HW_EMULATOR_CAMERA_JPEG_COMPRESSOR_H */
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