xref: /third_party/ffmpeg/libavcodec/huffyuv.h (revision cabdff1a) 
1/*
2 * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
5 * the algorithm used
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24/**
25 * @file
26 * huffyuv codec for libavcodec.
27 */
28
29#ifndef AVCODEC_HUFFYUV_H
30#define AVCODEC_HUFFYUV_H
31
32#include <stdint.h>
33
34#include "avcodec.h"
35#include "bswapdsp.h"
36#include "get_bits.h"
37#include "huffyuvdsp.h"
38#include "huffyuvencdsp.h"
39#include "put_bits.h"
40#include "lossless_videodsp.h"
41#include "lossless_videoencdsp.h"
42
43#define VLC_BITS 12
44
45#define MAX_BITS 16
46#define MAX_N (1<<MAX_BITS)
47#define MAX_VLC_N 16384
48
49typedef enum Predictor {
50    LEFT = 0,
51    PLANE,
52    MEDIAN,
53} Predictor;
54
55typedef struct HYuvContext {
56    AVClass *class;
57    AVCodecContext *avctx;
58    Predictor predictor;
59    GetBitContext gb;
60    PutBitContext pb;
61    int interlaced;
62    int decorrelate;
63    int bitstream_bpp;
64    int version;
65    int yuy2;                               //use yuy2 instead of 422P
66    int bgr32;                              //use bgr32 instead of bgr24
67    int bps;
68    int n;                                  // 1<<bps
69    int vlc_n;                              // number of vlc codes (FFMIN(1<<bps, MAX_VLC_N))
70    int alpha;
71    int chroma;
72    int yuv;
73    int chroma_h_shift;
74    int chroma_v_shift;
75    int width, height;
76    int flags;
77    int context;
78    int picture_number;
79    int last_slice_end;
80    uint8_t *temp[3];
81    uint16_t *temp16[3];                    ///< identical to temp but 16bit type
82    uint64_t stats[4][MAX_VLC_N];
83    uint8_t len[4][MAX_VLC_N];
84    uint32_t bits[4][MAX_VLC_N];
85    uint32_t pix_bgr_map[1<<VLC_BITS];
86    VLC vlc[8];                             //Y,U,V,A,YY,YU,YV,AA
87    uint8_t *bitstream_buffer;
88    unsigned int bitstream_buffer_size;
89    BswapDSPContext bdsp;
90    HuffYUVDSPContext hdsp;
91    HuffYUVEncDSPContext hencdsp;
92    LLVidDSPContext llviddsp;
93    LLVidEncDSPContext llvidencdsp;
94    int non_determ; // non-deterministic, multi-threaded encoder allowed
95} HYuvContext;
96
97void ff_huffyuv_common_init(AVCodecContext *s);
98void ff_huffyuv_common_end(HYuvContext *s);
99int  ff_huffyuv_alloc_temp(HYuvContext *s);
100int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n);
101
102#endif /* AVCODEC_HUFFYUV_H */
103