1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/*
* MJPEG encoder
* Copyright (c) 2016 William Ma, Ted Ying, Jerry Jiang
*
* 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
*/
/**
* @file
* Huffman table generation for MJPEG encoder.
*/
#ifndef AVCODEC_MJPEGENC_HUFFMAN_H
#define AVCODEC_MJPEGENC_HUFFMAN_H
#include <stdint.h>
typedef struct MJpegEncHuffmanContext {
int val_count[256];
} MJpegEncHuffmanContext;
// Uses the package merge algorithm to compute the Huffman table.
void ff_mjpeg_encode_huffman_init(MJpegEncHuffmanContext *s);
static inline void ff_mjpeg_encode_huffman_increment(MJpegEncHuffmanContext *s,
uint8_t val)
{
s->val_count[val]++;
}
void ff_mjpeg_encode_huffman_close(MJpegEncHuffmanContext *s,
uint8_t bits[17], uint8_t val[],
int max_nval);
#endif /* AVCODEC_MJPEGENC_HUFFMAN_H */
|
