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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* MPEG4 encoder/decoder internal header.
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_MPEG4VIDEO_H
#define AVCODEC_MPEG4VIDEO_H
#include <stdint.h>
#include "get_bits.h"
#include "mpegvideo.h"
#include "rl.h"
// shapes
#define RECT_SHAPE 0
#define BIN_SHAPE 1
#define BIN_ONLY_SHAPE 2
#define GRAY_SHAPE 3
#define SIMPLE_VO_TYPE 1
#define CORE_VO_TYPE 3
#define MAIN_VO_TYPE 4
#define NBIT_VO_TYPE 5
#define ARTS_VO_TYPE 10
#define ACE_VO_TYPE 12
#define ADV_SIMPLE_VO_TYPE 17
// aspect_ratio_info
#define EXTENDED_PAR 15
//vol_sprite_usage / sprite_enable
#define STATIC_SPRITE 1
#define GMC_SPRITE 2
#define MOTION_MARKER 0x1F001
#define DC_MARKER 0x6B001
#define VOS_STARTCODE 0x1B0
#define USER_DATA_STARTCODE 0x1B2
#define GOP_STARTCODE 0x1B3
#define VISUAL_OBJ_STARTCODE 0x1B5
#define VOP_STARTCODE 0x1B6
/* dc encoding for mpeg4 */
extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
extern const uint16_t ff_mpeg4_intra_vlc[103][2];
extern RLTable ff_mpeg4_rl_intra;
/* Note this is identical to the intra rvlc except that it is reordered. */
extern RLTable ff_rvlc_rl_inter;
extern RLTable ff_rvlc_rl_intra;
extern const uint16_t ff_sprite_trajectory_tab[15][2];
extern const uint8_t ff_mb_type_b_tab[4][2];
/* these matrixes will be permuted for the idct */
extern const int16_t ff_mpeg4_default_intra_matrix[64];
extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
extern const uint16_t ff_mpeg4_resync_prefix[8];
extern const uint8_t ff_mpeg4_dc_threshold[8];
void ff_mpeg4_encode_mb(MpegEncContext *s,
DCTELEM block[6][64],
int motion_x, int motion_y);
void ff_mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
int dir);
void ff_set_mpeg4_time(MpegEncContext * s);
void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);
void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
void ff_mpeg4_clean_buffers(MpegEncContext *s);
void ff_mpeg4_stuffing(PutBitContext * pbc);
void ff_mpeg4_init_partitions(MpegEncContext *s);
void ff_mpeg4_merge_partitions(MpegEncContext *s);
void ff_clean_mpeg4_qscales(MpegEncContext *s);
int ff_mpeg4_decode_partitions(MpegEncContext *s);
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
int ff_mpeg4_decode_video_packet_header(MpegEncContext *s);
void ff_mpeg4_init_direct_mv(MpegEncContext *s);
/**
*
* @return the mb_type
*/
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
void ff_mpeg4_init_tables(void);
#if 0 //3IV1 is quite rare and it slows things down a tiny bit
#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
#else
#define IS_3IV1 0
#endif
/**
* Predict the dc.
* encoding quantized level -> quantized diff
* decoding quantized diff -> quantized level
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr pointer to an integer where the prediction direction will be stored
*/
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
{
int a, b, c, wrap, pred, scale, ret;
int16_t *dc_val;
/* find prediction */
if (n < 4) {
scale = s->y_dc_scale;
} else {
scale = s->c_dc_scale;
}
if(IS_3IV1)
scale= 8;
wrap= s->block_wrap[n];
dc_val = s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/
a = dc_val[ - 1];
b = dc_val[ - 1 - wrap];
c = dc_val[ - wrap];
/* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
if(s->first_slice_line && n!=3){
if(n!=2) b=c= 1024;
if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
}
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
if(n==0 || n==4 || n==5)
b=1024;
}
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1; /* top */
} else {
pred = a;
*dir_ptr = 0; /* left */
}
/* we assume pred is positive */
pred = FASTDIV((pred + (scale >> 1)), scale);
if(encoding){
ret = level - pred;
}else{
level += pred;
ret= level;
if(s->err_recognition&AV_EF_BITSTREAM){
if(level<0){
av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
if(level*scale > 2048 + scale){
av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
}
}
level *=scale;
if(level&(~2047)){
if(level<0)
level=0;
else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
level=2047;
}
dc_val[0]= level;
return ret;
}
#endif /* AVCODEC_MPEG4VIDEO_H */
|
