Statistics
| Branch: | Revision:

ffmpeg / libavcodec / h263.h @ bb174ff1

History | View | Annotate | Download (7.8 KB)

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

    
32
extern const AVRational ff_h263_pixel_aspect[16];
33
extern const uint8_t ff_h263_cbpy_tab[16][2];
34

    
35
extern const uint8_t cbpc_b_tab[4][2];
36

    
37
extern const uint8_t mvtab[33][2];
38

    
39
extern const uint8_t ff_h263_intra_MCBPC_code[9];
40
extern const uint8_t ff_h263_intra_MCBPC_bits[9];
41

    
42
extern const uint8_t ff_h263_inter_MCBPC_code[28];
43
extern const uint8_t ff_h263_inter_MCBPC_bits[28];
44
extern const uint8_t h263_mbtype_b_tab[15][2];
45

    
46
extern VLC ff_h263_intra_MCBPC_vlc;
47
extern VLC ff_h263_inter_MCBPC_vlc;
48
extern VLC ff_h263_cbpy_vlc;
49

    
50
extern RLTable ff_h263_rl_inter;
51

    
52
extern RLTable rl_intra_aic;
53

    
54
extern const uint16_t h263_format[8][2];
55
extern const uint8_t modified_quant_tab[2][32];
56
extern uint16_t ff_mba_max[6];
57
extern uint8_t ff_mba_length[7];
58

    
59
extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
60

    
61

    
62
int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
63
av_const int ff_h263_aspect_to_info(AVRational aspect);
64
int ff_h263_decode_init(AVCodecContext *avctx);
65
int ff_h263_decode_frame(AVCodecContext *avctx,
66
                             void *data, int *data_size,
67
                             AVPacket *avpkt);
68
int ff_h263_decode_end(AVCodecContext *avctx);
69
void h263_encode_mb(MpegEncContext *s,
70
                    DCTELEM block[6][64],
71
                    int motion_x, int motion_y);
72
void h263_encode_picture_header(MpegEncContext *s, int picture_number);
73
void h263_encode_gob_header(MpegEncContext * s, int mb_line);
74
int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
75
                        int *px, int *py);
76
void h263_encode_init(MpegEncContext *s);
77
void h263_decode_init_vlc(MpegEncContext *s);
78
int h263_decode_picture_header(MpegEncContext *s);
79
int ff_h263_decode_gob_header(MpegEncContext *s);
80
void ff_h263_update_motion_val(MpegEncContext * s);
81
void ff_h263_loop_filter(MpegEncContext * s);
82
int ff_h263_decode_mba(MpegEncContext *s);
83
void ff_h263_encode_mba(MpegEncContext *s);
84
void ff_init_qscale_tab(MpegEncContext *s);
85
int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
86
void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
87

    
88

    
89
/**
90
 * Prints picture info if FF_DEBUG_PICT_INFO is set.
91
 */
92
void ff_h263_show_pict_info(MpegEncContext *s);
93

    
94
int ff_intel_h263_decode_picture_header(MpegEncContext *s);
95
int ff_h263_decode_mb(MpegEncContext *s,
96
                      DCTELEM block[6][64]);
97

    
98
/**
99
 * Returns the value of the 3bit "source format" syntax element.
100
 * that represents some standard picture dimensions or indicates that
101
 * width&height are explicitly stored later.
102
 */
103
int av_const h263_get_picture_format(int width, int height);
104

    
105
void ff_clean_h263_qscales(MpegEncContext *s);
106
int ff_h263_resync(MpegEncContext *s);
107
const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
108
int ff_h263_get_gob_height(MpegEncContext *s);
109
void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
110

    
111

    
112
static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
113
    int l, bit_size, code;
114

    
115
    if (val == 0) {
116
        return mvtab[0][1];
117
    } else {
118
        bit_size = f_code - 1;
119
        /* modulo encoding */
120
        l= INT_BIT - 6 - bit_size;
121
        val = (val<<l)>>l;
122
        val--;
123
        code = (val >> bit_size) + 1;
124

    
125
        return mvtab[code][1] + 1 + bit_size;
126
    }
127
}
128

    
129
static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
130
    if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
131
        skip_put_bits(&s->pb,
132
            h263_get_motion_length(s, x, f_code)
133
           +h263_get_motion_length(s, y, f_code));
134
    }else{
135
        ff_h263_encode_motion(s, x, f_code);
136
        ff_h263_encode_motion(s, y, f_code);
137
    }
138
}
139

    
140
static inline int get_p_cbp(MpegEncContext * s,
141
                      DCTELEM block[6][64],
142
                      int motion_x, int motion_y){
143
    int cbp, i;
144

    
145
    if(s->flags & CODEC_FLAG_CBP_RD){
146
        int best_cbpy_score= INT_MAX;
147
        int best_cbpc_score= INT_MAX;
148
        int cbpc = (-1), cbpy= (-1);
149
        const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
150
        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
151

    
152
        for(i=0; i<4; i++){
153
            int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
154
            if(i&1) score += s->coded_score[5];
155
            if(i&2) score += s->coded_score[4];
156

    
157
            if(score < best_cbpc_score){
158
                best_cbpc_score= score;
159
                cbpc= i;
160
            }
161
        }
162

    
163
        for(i=0; i<16; i++){
164
            int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
165
            if(i&1) score += s->coded_score[3];
166
            if(i&2) score += s->coded_score[2];
167
            if(i&4) score += s->coded_score[1];
168
            if(i&8) score += s->coded_score[0];
169

    
170
            if(score < best_cbpy_score){
171
                best_cbpy_score= score;
172
                cbpy= i;
173
            }
174
        }
175
        cbp= cbpc + 4*cbpy;
176
        if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
177
            if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
178
                cbp= 0;
179
        }
180

    
181
        for (i = 0; i < 6; i++) {
182
            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
183
                s->block_last_index[i]= -1;
184
                s->dsp.clear_block(s->block[i]);
185
            }
186
        }
187
    }else{
188
        cbp= 0;
189
        for (i = 0; i < 6; i++) {
190
            if (s->block_last_index[i] >= 0)
191
                cbp |= 1 << (5 - i);
192
        }
193
    }
194
    return cbp;
195
}
196

    
197
static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
198
                            int motion_x, int motion_y, int mb_type){
199
    int cbp=0, i;
200

    
201
    if(s->flags & CODEC_FLAG_CBP_RD){
202
        int score=0;
203
        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
204

    
205
        for(i=0; i<6; i++){
206
            if(s->coded_score[i] < 0){
207
                score += s->coded_score[i];
208
                cbp |= 1 << (5 - i);
209
            }
210
        }
211

    
212
        if(cbp){
213
            int zero_score= -6;
214
            if ((motion_x | motion_y | s->dquant | mb_type) == 0){
215
                zero_score-= 4; //2*MV + mb_type + cbp bit
216
            }
217

    
218
            zero_score*= lambda;
219
            if(zero_score <= score){
220
                cbp=0;
221
            }
222
        }
223

    
224
        for (i = 0; i < 6; i++) {
225
            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
226
                s->block_last_index[i]= -1;
227
                s->dsp.clear_block(s->block[i]);
228
            }
229
        }
230
    }else{
231
        for (i = 0; i < 6; i++) {
232
            if (s->block_last_index[i] >= 0)
233
                cbp |= 1 << (5 - i);
234
        }
235
    }
236
    return cbp;
237
}
238

    
239
static inline void memsetw(short *tab, int val, int n)
240
{
241
    int i;
242
    for(i=0;i<n;i++)
243
        tab[i] = val;
244
}
245
#endif