intrax8: Keep a reference to the context idctdsp
[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 "idctdsp.h"
25 #include "intrax8dsp.h"
26
27 typedef struct IntraX8Context {
28 VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
29 VLC *j_orient_vlc;
30 VLC *j_dc_vlc[3];
31
32 int use_quant_matrix;
33
34 // set by ff_intrax8_common_init
35 uint8_t *prediction_table; // 2 * (mb_w * 2)
36 ScanTable scantable[3];
37
38 // set by the caller codec
39 MpegEncContext *s;
40 IntraX8DSPContext dsp;
41 IDCTDSPContext idsp;
42 int quant;
43 int dquant;
44 int qsum;
45
46 // calculated per frame
47 int quant_dc_chroma;
48 int divide_quant_dc_luma;
49 int divide_quant_dc_chroma;
50 uint8_t *dest[3];
51
52 // changed per block
53 int edges;
54 int flat_dc;
55 int predicted_dc;
56 int raw_orient;
57 int chroma_orient;
58 int orient;
59 int est_run;
60 } IntraX8Context;
61
62 /**
63 * Initialize IntraX8 frame decoder.
64 * Requires valid MpegEncContext with valid s->mb_width before calling.
65 * @param w pointer to IntraX8Context
66 * @param idsp pointer to IDCTDSPContext
67 * @param s pointer to MpegEncContext of the parent codec
68 * @return 0 on success, a negative AVERROR value on error
69 */
70 int ff_intrax8_common_init(IntraX8Context *w, IDCTDSPContext *idsp,
71 MpegEncContext *const s);
72
73 /**
74 * Destroy IntraX8 frame structure.
75 * @param w pointer to IntraX8Context
76 */
77 void ff_intrax8_common_end(IntraX8Context *w);
78
79 /**
80 * Decode single IntraX8 frame.
81 * The parent codec must fill s->loopfilter and s->gb (bitstream).
82 * The parent codec must call ff_mpv_frame_start() before calling this function.
83 * The parent codec must call ff_mpv_frame_end() after calling this function.
84 * This function does not use ff_mpv_decode_mb().
85 * @param w pointer to IntraX8Context
86 * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
87 * @param quant_offset offset away from zero
88 */
89 int ff_intrax8_decode_picture(IntraX8Context *w, int quant, int halfpq);
90
91 #endif /* AVCODEC_INTRAX8_H */