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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* H.263 encoder header
*
* 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
*/
#ifndef AVCODEC_H263ENC_H
#define AVCODEC_H263ENC_H
#include <stdint.h>
#include "h263data.h"
#include "mpegvideo.h"
void ff_h263_encode_init(MpegEncContext *s);
void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
void ff_h263_encode_mb(MpegEncContext *s,
int16_t block[6][64],
int motion_x, int motion_y);
void ff_h263_encode_mba(MpegEncContext *s);
void ff_init_qscale_tab(MpegEncContext *s);
void ff_clean_h263_qscales(MpegEncContext *s);
void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
static inline int h263_get_motion_length(int val, int f_code)
{
int bit_size, code, sign;
if (val == 0) {
return 1; /* ff_mvtab[0][1] */
} else {
bit_size = f_code - 1;
/* modulo encoding */
val = sign_extend(val, 6 + bit_size);
sign = val >> 31;
val = (val ^ sign) - sign; /* val = FFABS(val) */
val--;
code = (val >> bit_size) + 1;
return ff_mvtab[code][1] + 1 + bit_size;
}
}
static inline void ff_h263_encode_motion_vector(MpegEncContext * s,
int x, int y, int f_code)
{
if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
skip_put_bits(&s->pb,
h263_get_motion_length(x, f_code) +
h263_get_motion_length(y, f_code));
} else {
ff_h263_encode_motion(&s->pb, x, f_code);
ff_h263_encode_motion(&s->pb, y, f_code);
}
}
static inline int get_p_cbp(MpegEncContext * s,
int16_t block[6][64],
int motion_x, int motion_y){
int cbp;
if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
int best_cbpy_score = INT_MAX;
int best_cbpc_score = INT_MAX;
int cbpc = (-1), cbpy = (-1);
const int offset = (s->mv_type == MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
for (int i = 0; i < 4; i++) {
int score = ff_h263_inter_MCBPC_bits[i + offset] * lambda;
if (i & 1) score += s->coded_score[5];
if (i & 2) score += s->coded_score[4];
if (score < best_cbpc_score) {
best_cbpc_score = score;
cbpc = i;
}
}
for (int i = 0; i < 16; i++) {
int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
if (i & 1) score += s->coded_score[3];
if (i & 2) score += s->coded_score[2];
if (i & 4) score += s->coded_score[1];
if (i & 8) score += s->coded_score[0];
if (score < best_cbpy_score) {
best_cbpy_score = score;
cbpy = i;
}
}
cbp = cbpc + 4 * cbpy;
if (!(motion_x | motion_y | s->dquant) && s->mv_type == MV_TYPE_16X16) {
if (best_cbpy_score + best_cbpc_score + 2 * lambda >= 0)
cbp= 0;
}
for (int i = 0; i < 6; i++) {
if (s->block_last_index[i] >= 0 && !((cbp >> (5 - i)) & 1)) {
s->block_last_index[i] = -1;
s->bdsp.clear_block(s->block[i]);
}
}
} else {
cbp = 0;
for (int i = 0; i < 6; i++) {
if (s->block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
}
}
return cbp;
}
#endif
|
