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Diffstat (limited to 'contrib/ffmpeg/libavcodec/rle.c')
-rw-r--r-- | contrib/ffmpeg/libavcodec/rle.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/contrib/ffmpeg/libavcodec/rle.c b/contrib/ffmpeg/libavcodec/rle.c deleted file mode 100644 index 2fb0d0e48..000000000 --- a/contrib/ffmpeg/libavcodec/rle.c +++ /dev/null @@ -1,84 +0,0 @@ -/* - * RLE encoder - * Copyright (c) 2007 Bobby Bingham - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include "avcodec.h" -#include "rle.h" - -/** - * Count up to 127 consecutive pixels which are either all the same or - * all differ from the previous and next pixels. - * @param start Pointer to the first pixel - * @param len Maximum number of pixels - * @param bpp Bytes per pixel - * @param same 1 if searching for identical pixel values. 0 for differing - * @return Number of matching consecutive pixels found - */ -static int count_pixels(const uint8_t *start, int len, int bpp, int same) -{ - const uint8_t *pos; - int count = 1; - - for(pos = start + bpp; count < FFMIN(128, len); pos += bpp, count ++) { - if(same != !memcmp(pos-bpp, pos, bpp)) { - if(!same) { - /* if bpp == 1, then 0 1 1 0 is more efficiently encoded as a single - * raw block of pixels. for larger bpp, RLE is as good or better */ - if(bpp == 1 && count + 1 < FFMIN(128, len) && *pos != *(pos+1)) - continue; - - /* if RLE can encode the next block better than as a raw block, - * back up and leave _all_ the identical pixels for RLE */ - count --; - } - break; - } - } - - return count; -} - -int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w, - int add_rep, int xor_rep, int add_raw, int xor_raw) -{ - int count, x; - uint8_t *out = outbuf; - - for(x = 0; x < w; x += count) { - /* see if we can encode the next set of pixels with RLE */ - if((count = count_pixels(ptr, w-x, bpp, 1)) > 1) { - if(out + bpp + 1 > outbuf + out_size) return -1; - *out++ = (count ^ xor_rep) + add_rep; - memcpy(out, ptr, bpp); - out += bpp; - } else { - /* fall back on uncompressed */ - count = count_pixels(ptr, w-x, bpp, 0); - *out++ = (count ^ xor_raw) + add_raw; - - if(out + bpp*count > outbuf + out_size) return -1; - memcpy(out, ptr, bpp * count); - out += bpp * count; - } - - ptr += count * bpp; - } - - return out - outbuf; -} |