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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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2a4bfc0fc8
Original commit message from CVS: A simple video scaler as a library and an Element. Also a little non working mpeg2 to mpeg1 converter (still struggling with the quantisation).
65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*
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* Copyright (c) 1995 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose, without fee, and without written agreement is
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* hereby granted, provided that the above copyright notice and the following
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* two paragraphs appear in all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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typedef struct _GstColorSpaceYUVTables GstColorSpaceYUVTables;
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struct _GstColorSpaceYUVTables {
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int gammaCorrectFlag;
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double gammaCorrect;
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int chromaCorrectFlag;
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double chromaCorrect;
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int *L_tab, *Cr_r_tab, *Cr_g_tab, *Cb_g_tab, *Cb_b_tab;
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/*
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* We define tables that convert a color value between -256 and 512
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* into the R, G and B parts of the pixel. The normal range is 0-255.
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**/
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long *r_2_pix;
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long *g_2_pix;
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long *b_2_pix;
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};
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#define CB_BASE 1
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#define CR_BASE (CB_BASE*CB_RANGE)
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#define LUM_BASE (CR_BASE*CR_RANGE)
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#define Min(x,y) (((x) < (y)) ? (x) : (y))
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#define Max(x,y) (((x) > (y)) ? (x) : (y))
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#define GAMMA_CORRECTION(x) ((int)(pow((x) / 255.0, 1.0 / gammaCorrect) * 255.0))
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#define CHROMA_CORRECTION256(x) ((x) >= 128 \
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? 128 + Min(127, (int)(((x) - 128.0) * chromaCorrect)) \
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: 128 - Min(128, (int)((128.0 - (x)) * chromaCorrect)))
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#define CHROMA_CORRECTION128(x) ((x) >= 0 \
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? Min(127, (int)(((x) * chromaCorrect))) \
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: Max(-128, (int)(((x) * chromaCorrect))))
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#define CHROMA_CORRECTION256D(x) ((x) >= 128 \
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? 128.0 + Min(127.0, (((x) - 128.0) * chromaCorrect)) \
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: 128.0 - Min(128.0, (((128.0 - (x)) * chromaCorrect))))
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#define CHROMA_CORRECTION128D(x) ((x) >= 0 \
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? Min(127.0, ((x) * chromaCorrect)) \
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: Max(-128.0, ((x) * chromaCorrect)))
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