83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
/*
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OpenPnp-Capture: a video capture subsystem.
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Linux platform code, MJPEG decoding using libjpeg-turbo
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Created by Niels Moseley on 7/6/17.
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Copyright (c) 2017 Niels Moseley.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "mjpeghelper.h"
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#include "../common/logging.h"
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bool MJPEGHelper::decompressFrame(const uint8_t *inBuffer,
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size_t inBytes, uint8_t *outBuffer,
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uint32_t outBufWidth, uint32_t outBufHeight)
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{
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// note: the jpeg-turbo library apparently uses a non-const
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// buffer pointer to the incoming JPEG data.
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// Hopefully, the lib does not change the JPEG data buffer.
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// so, for now, we'll cast it to a non-const pointer.
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// Yes, that is completely dirty... I'm not happy with it either.
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uint8_t *jpegPtr = const_cast<uint8_t*>(inBuffer);
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int32_t width, height, jpegSubsamp;
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tjDecompressHeader2(m_decompressHandle, jpegPtr, inBytes, &width, &height, &jpegSubsamp);
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if ((width != outBufWidth) || (height != outBufHeight))
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{
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LOG(LOG_ERR, "tjDecompressHeader2 failed: %s\n", tjGetErrorStr());
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return false;
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}
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else
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{
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LOG(LOG_VERBOSE, "MJPG: %d %d size %d bytes\n", width, height, inBytes);
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}
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if (tjDecompress2(m_decompressHandle, jpegPtr, inBytes, outBuffer,
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width, 0/*pitch*/, height, TJPF_RGB, TJFLAG_FASTDCT) != 0)
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{
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// A lot of cameras produce incorrect but decodable JPEG data
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// and produce warnings that fill the console,
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// such as 'extraneous bytes before marker' etc.
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//
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// To avoid cluttering the console, we suppress the warnings
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// and errors completely.. :-/
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//
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// FIXME: the following disabled code only works for
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// very recent libjpeg-turbo libraries that aren't common on systems
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// yet..
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#if 0
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if (tjGetErrorCode(m_decompressHandle)==TJERR_ERROR)
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{
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LOG(LOG_ERR, "tjDecompress2 failed: %s\n", tjGetErrorStr());
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return false;
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}
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#endif
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return true;
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}
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return true;
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} |