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51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/*
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* RLE encoder
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_RLE_H
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#define AVCODEC_RLE_H
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#include <stdint.h>
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/**
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* Count up to 127 consecutive pixels which are either all the same or
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* all differ from the previous and next pixels.
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* @param start Pointer to the first pixel
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* @param len Maximum number of pixels
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* @param bpp Bytes per pixel
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* @param same 1 if searching for identical pixel values, 0 for differing
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* @return Number of matching consecutive pixels found
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*/
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int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same);
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/**
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* RLE compress the row, with maximum size of out_size.
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* Value before repeated bytes is (count ^ xor_rep) + add_rep.
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* Value before raw bytes is (count ^ xor_raw) + add_raw.
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* @param outbuf Output buffer
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* @param out_size Maximum output size
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* @param inbuf Input buffer
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* @param bpp Bytes per pixel
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* @param w Image width
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* @return Size of output in bytes, or -1 if larger than out_size
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*/
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int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp,
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int w, int add_rep, int xor_rep, int add_raw, int xor_raw);
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#endif /* AVCODEC_RLE_H */
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