Rename mpeg4 intra vlc tables so they contain "mpeg4", this improves readability
[libav.git] / libavcodec / h263.h
CommitLineData
ca334dd1
MN
1/*
2 * H263 internal header
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#ifndef AVCODEC_H263_H
21#define AVCODEC_H263_H
22
23// The defines below define the number of bits that are read at once for
24// reading vlc values. Changing these may improve speed and data cache needs
25// be aware though that decreasing them may need the number of stages that is
26// passed to get_vlc* to be increased.
27#define INTRA_MCBPC_VLC_BITS 6
28#define INTER_MCBPC_VLC_BITS 7
29#define CBPY_VLC_BITS 6
30#define TEX_VLC_BITS 9
31
32extern const AVRational ff_h263_pixel_aspect[16];
33extern const uint8_t cbpy_tab[16][2];
34
35extern const uint8_t mvtab[33][2];
36
37extern const uint8_t intra_MCBPC_code[9];
38extern const uint8_t intra_MCBPC_bits[9];
39
40extern const uint8_t inter_MCBPC_code[28];
41extern const uint8_t inter_MCBPC_bits[28];
42
43extern VLC intra_MCBPC_vlc;
44extern VLC inter_MCBPC_vlc;
45extern VLC cbpy_vlc;
46
47extern RLTable rl_inter;
48
49int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
50av_const int ff_h263_aspect_to_info(AVRational aspect);
51
52static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
53 int l, bit_size, code;
54
55 if (val == 0) {
56 return mvtab[0][1];
57 } else {
58 bit_size = f_code - 1;
59 /* modulo encoding */
60 l= INT_BIT - 6 - bit_size;
61 val = (val<<l)>>l;
62 val--;
63 code = (val >> bit_size) + 1;
64
65 return mvtab[code][1] + 1 + bit_size;
66 }
67}
68
69static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
70 if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
71 skip_put_bits(&s->pb,
72 h263_get_motion_length(s, x, f_code)
73 +h263_get_motion_length(s, y, f_code));
74 }else{
75 ff_h263_encode_motion(s, x, f_code);
76 ff_h263_encode_motion(s, y, f_code);
77 }
78}
79
80static inline int get_p_cbp(MpegEncContext * s,
81 DCTELEM block[6][64],
82 int motion_x, int motion_y){
83 int cbp, i;
84
85 if(s->flags & CODEC_FLAG_CBP_RD){
86 int best_cbpy_score= INT_MAX;
87 int best_cbpc_score= INT_MAX;
88 int cbpc = (-1), cbpy= (-1);
89 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
90 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
91
92 for(i=0; i<4; i++){
93 int score= inter_MCBPC_bits[i + offset] * lambda;
94 if(i&1) score += s->coded_score[5];
95 if(i&2) score += s->coded_score[4];
96
97 if(score < best_cbpc_score){
98 best_cbpc_score= score;
99 cbpc= i;
100 }
101 }
102
103 for(i=0; i<16; i++){
104 int score= cbpy_tab[i ^ 0xF][1] * lambda;
105 if(i&1) score += s->coded_score[3];
106 if(i&2) score += s->coded_score[2];
107 if(i&4) score += s->coded_score[1];
108 if(i&8) score += s->coded_score[0];
109
110 if(score < best_cbpy_score){
111 best_cbpy_score= score;
112 cbpy= i;
113 }
114 }
115 cbp= cbpc + 4*cbpy;
116 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
117 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
118 cbp= 0;
119 }
120
121 for (i = 0; i < 6; i++) {
122 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
123 s->block_last_index[i]= -1;
124 s->dsp.clear_block(s->block[i]);
125 }
126 }
127 }else{
128 cbp= 0;
129 for (i = 0; i < 6; i++) {
130 if (s->block_last_index[i] >= 0)
131 cbp |= 1 << (5 - i);
132 }
133 }
134 return cbp;
135}
136
137static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
138 int motion_x, int motion_y, int mb_type){
139 int cbp=0, i;
140
141 if(s->flags & CODEC_FLAG_CBP_RD){
142 int score=0;
143 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
144
145 for(i=0; i<6; i++){
146 if(s->coded_score[i] < 0){
147 score += s->coded_score[i];
148 cbp |= 1 << (5 - i);
149 }
150 }
151
152 if(cbp){
153 int zero_score= -6;
154 if ((motion_x | motion_y | s->dquant | mb_type) == 0){
155 zero_score-= 4; //2*MV + mb_type + cbp bit
156 }
157
158 zero_score*= lambda;
159 if(zero_score <= score){
160 cbp=0;
161 }
162 }
163
164 for (i = 0; i < 6; i++) {
165 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
166 s->block_last_index[i]= -1;
167 s->dsp.clear_block(s->block[i]);
168 }
169 }
170 }else{
171 for (i = 0; i < 6; i++) {
172 if (s->block_last_index[i] >= 0)
173 cbp |= 1 << (5 - i);
174 }
175 }
176 return cbp;
177}
178#endif