e2532f8696c5d7fc6970318fff15cdb83fd8d702
[libav.git] / libavcodec / intrax8.h
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef AVCODEC_INTRAX8_H
20 #define AVCODEC_INTRAX8_H
21
22 #include "get_bits.h"
23 #include "mpegvideo.h"
24 #include "intrax8dsp.h"
25
26 typedef struct IntraX8Context {
27 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
28 VLC *j_orient_vlc;
29 VLC *j_dc_vlc[3];
30
31 int use_quant_matrix;
32
33 // set by ff_intrax8_common_init
34 uint8_t *prediction_table; // 2 * (mb_w * 2)
35 ScanTable scantable[3];
36
37 // set by the caller codec
38 MpegEncContext *s;
39 IntraX8DSPContext dsp;
40 int quant;
41 int dquant;
42 int qsum;
43
44 // calculated per frame
45 int quant_dc_chroma;
46 int divide_quant_dc_luma;
47 int divide_quant_dc_chroma;
48 uint8_t *dest[3];
49
50 // changed per block
51 int edges;
52 int flat_dc;
53 int predicted_dc;
54 int raw_orient;
55 int chroma_orient;
56 int orient;
57 int est_run;
58 } IntraX8Context;
59
60 /**
61 * Initialize IntraX8 frame decoder.
62 * Requires valid MpegEncContext with valid s->mb_width before calling.
63 * @param w pointer to IntraX8Context
64 * @param s pointer to MpegEncContext of the parent codec
65 * @return 0 on success, a negative AVERROR value on error
66 */
67 int ff_intrax8_common_init(IntraX8Context *w, MpegEncContext *const s);
68
69 /**
70 * Destroy IntraX8 frame structure.
71 * @param w pointer to IntraX8Context
72 */
73 void ff_intrax8_common_end(IntraX8Context *w);
74
75 /**
76 * Decode single IntraX8 frame.
77 * The parent codec must fill s->loopfilter and s->gb (bitstream).
78 * The parent codec must call ff_mpv_frame_start() before calling this function.
79 * The parent codec must call ff_mpv_frame_end() after calling this function.
80 * This function does not use ff_mpv_decode_mb().
81 * @param w pointer to IntraX8Context
82 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
83 * @param quant_offset offset away from zero
84 */
85 int ff_intrax8_decode_picture(IntraX8Context *w, int quant, int halfpq);
86
87 #endif /* AVCODEC_INTRAX8_H */