FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h263.h
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 12 53 22.6%
Branches: 6 46 13.0%

Line Branch Exec Source
1 /*
2 * H.263 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 #include <stdint.h>
24 #include "libavutil/rational.h"
25 #include "get_bits.h"
26 #include "mpegvideo.h"
27 #include "h263data.h"
28 #include "rl.h"
29
30 #define FF_ASPECT_EXTENDED 15
31 #define INT_BIT (CHAR_BIT * sizeof(int))
32
33 // The defines below define the number of bits that are read at once for
34 // reading vlc values. Changing these may improve speed and data cache needs
35 // be aware though that decreasing them may need the number of stages that is
36 // passed to get_vlc* to be increased.
37 #define H263_MV_VLC_BITS 9
38 #define INTRA_MCBPC_VLC_BITS 6
39 #define INTER_MCBPC_VLC_BITS 7
40 #define CBPY_VLC_BITS 6
41 #define TEX_VLC_BITS 9
42
43 #define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
44
45 extern VLC ff_h263_intra_MCBPC_vlc;
46 extern VLC ff_h263_inter_MCBPC_vlc;
47 extern VLC ff_h263_cbpy_vlc;
48 extern VLC ff_h263_mv_vlc;
49
50 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
51
52
53 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
54 av_const int ff_h263_aspect_to_info(AVRational aspect);
55 int ff_h263_decode_init(AVCodecContext *avctx);
56 int ff_h263_decode_frame(AVCodecContext *avctx,
57 void *data, int *got_frame,
58 AVPacket *avpkt);
59 int ff_h263_decode_end(AVCodecContext *avctx);
60 void ff_h263_encode_mb(MpegEncContext *s,
61 int16_t block[6][64],
62 int motion_x, int motion_y);
63 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
64 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
65 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
66 int *px, int *py);
67 void ff_h263_encode_init(MpegEncContext *s);
68 void ff_h263_decode_init_vlc(void);
69 void ff_h263_init_rl_inter(void);
70 int ff_h263_decode_picture_header(MpegEncContext *s);
71 int ff_h263_decode_gob_header(MpegEncContext *s);
72 void ff_h263_update_motion_val(MpegEncContext * s);
73 void ff_h263_loop_filter(MpegEncContext * s);
74 int ff_h263_decode_mba(MpegEncContext *s);
75 void ff_h263_encode_mba(MpegEncContext *s);
76 void ff_init_qscale_tab(MpegEncContext *s);
77 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
78 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
79
80
81 /**
82 * Print picture info if FF_DEBUG_PICT_INFO is set.
83 */
84 void ff_h263_show_pict_info(MpegEncContext *s);
85
86 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
87 int ff_h263_decode_mb(MpegEncContext *s,
88 int16_t block[6][64]);
89
90 /**
91 * Return the value of the 3-bit "source format" syntax element.
92 * This represents some standard picture dimensions or indicates that
93 * width&height are explicitly stored later.
94 */
95 int av_const h263_get_picture_format(int width, int height);
96
97 void ff_clean_h263_qscales(MpegEncContext *s);
98 int ff_h263_resync(MpegEncContext *s);
99 void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
100
101
102 static inline int h263_get_motion_length(int val, int f_code){
103 int l, bit_size, code;
104
105 if (val == 0) {
106 return ff_mvtab[0][1];
107 } else {
108 bit_size = f_code - 1;
109 /* modulo encoding */
110 l= INT_BIT - 6 - bit_size;
111 val = (val<<l)>>l;
112 val--;
113 code = (val >> bit_size) + 1;
114
115 return ff_mvtab[code][1] + 1 + bit_size;
116 }
117 }
118
119 2598845 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
120
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2598845 if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
121 skip_put_bits(&s->pb,
122 h263_get_motion_length(x, f_code)
123 +h263_get_motion_length(y, f_code));
124 }else{
125 2598845 ff_h263_encode_motion(&s->pb, x, f_code);
126 2598845 ff_h263_encode_motion(&s->pb, y, f_code);
127 }
128 2598845 }
129
130 1154089 static inline int get_p_cbp(MpegEncContext * s,
131 int16_t block[6][64],
132 int motion_x, int motion_y){
133 int cbp, i;
134
135
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1154089 if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
136 int best_cbpy_score= INT_MAX;
137 int best_cbpc_score= INT_MAX;
138 int cbpc = (-1), cbpy= (-1);
139 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
140 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
141
142 for(i=0; i<4; i++){
143 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
144 if(i&1) score += s->coded_score[5];
145 if(i&2) score += s->coded_score[4];
146
147 if(score < best_cbpc_score){
148 best_cbpc_score= score;
149 cbpc= i;
150 }
151 }
152
153 for(i=0; i<16; i++){
154 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
155 if(i&1) score += s->coded_score[3];
156 if(i&2) score += s->coded_score[2];
157 if(i&4) score += s->coded_score[1];
158 if(i&8) score += s->coded_score[0];
159
160 if(score < best_cbpy_score){
161 best_cbpy_score= score;
162 cbpy= i;
163 }
164 }
165 cbp= cbpc + 4*cbpy;
166 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
167 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
168 cbp= 0;
169 }
170
171 for (i = 0; i < 6; i++) {
172 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
173 s->block_last_index[i]= -1;
174 s->bdsp.clear_block(s->block[i]);
175 }
176 }
177 }else{
178 1154089 cbp= 0;
179
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8078623 for (i = 0; i < 6; i++) {
180
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6924534 if (s->block_last_index[i] >= 0)
181 3085829 cbp |= 1 << (5 - i);
182 }
183 }
184 1154089 return cbp;
185 }
186
187 #endif /* AVCODEC_H263_H */
188