FFmpeg
rle.h
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1 /*
2  * RLE encoder
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_RLE_H
22 #define AVCODEC_RLE_H
23 
24 #include <stdint.h>
25 
26 /**
27  * Count up to 127 consecutive pixels which are either all the same or
28  * all differ from the previous and next pixels.
29  * @param start Pointer to the first pixel
30  * @param len Maximum number of pixels
31  * @param bpp Bytes per pixel
32  * @param same 1 if searching for identical pixel values, 0 for differing
33  * @return Number of matching consecutive pixels found
34  */
35 int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same);
36 
37 /**
38  * RLE compress the row, with maximum size of out_size.
39  * Value before repeated bytes is (count ^ xor_rep) + add_rep.
40  * Value before raw bytes is (count ^ xor_raw) + add_raw.
41  * @param outbuf Output buffer
42  * @param out_size Maximum output size
43  * @param inbuf Input buffer
44  * @param bpp Bytes per pixel
45  * @param w Image width
46  * @return Size of output in bytes, or -1 if larger than out_size
47  */
48 int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp,
49  int w, int add_rep, int xor_rep, int add_raw, int xor_raw);
50 
51 #endif /* AVCODEC_RLE_H */
out_size
int out_size
Definition: movenc.c:56
w
uint8_t w
Definition: llviddspenc.c:38
ff_rle_encode
int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, int w, int add_rep, int xor_rep, int add_raw, int xor_raw)
RLE compress the row, with maximum size of out_size.
Definition: rle.c:53
len
int len
Definition: vorbis_enc_data.h:426
ff_rle_count_pixels
int ff_rle_count_pixels(const uint8_t *start, int len, int bpp, int same)
Count up to 127 consecutive pixels which are either all the same or all differ from the previous and ...
Definition: rle.c:28