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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#if !FF_API_ASPECT_EXTENDED
31#define FF_ASPECT_EXTENDED 15
32#endif
33#define INT_BIT (CHAR_BIT * sizeof(int))
34
35// The defines below define the number of bits that are read at once for
36// reading vlc values. Changing these may improve speed and data cache needs
37// be aware though that decreasing them may need the number of stages that is
38// passed to get_vlc* to be increased.
39#define INTRA_MCBPC_VLC_BITS 6
40#define INTER_MCBPC_VLC_BITS 7
41#define CBPY_VLC_BITS 6
42#define TEX_VLC_BITS 9
43
44#define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
45
46extern VLC ff_h263_intra_MCBPC_vlc;
47extern VLC ff_h263_inter_MCBPC_vlc;
48extern VLC ff_h263_cbpy_vlc;
49
50extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
51
52
53int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
54av_const int ff_h263_aspect_to_info(AVRational aspect);
55int ff_h263_decode_init(AVCodecContext *avctx);
56int ff_h263_decode_frame(AVCodecContext *avctx,
57 void *data, int *got_frame,
58 AVPacket *avpkt);
59int ff_h263_decode_end(AVCodecContext *avctx);
60void ff_h263_encode_mb(MpegEncContext *s,
61 int16_t block[6][64],
62 int motion_x, int motion_y);
63void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
64void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
65int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
66 int *px, int *py);
67void ff_h263_encode_init(MpegEncContext *s);
68void ff_h263_decode_init_vlc(void);
69int ff_h263_decode_picture_header(MpegEncContext *s);
70int ff_h263_decode_gob_header(MpegEncContext *s);
71void ff_h263_update_motion_val(MpegEncContext * s);
72void ff_h263_loop_filter(MpegEncContext * s);
73int ff_h263_decode_mba(MpegEncContext *s);
74void ff_h263_encode_mba(MpegEncContext *s);
75void ff_init_qscale_tab(MpegEncContext *s);
76int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
77void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
78
79
80/**
81 * Print picture info if FF_DEBUG_PICT_INFO is set.
82 */
83void ff_h263_show_pict_info(MpegEncContext *s);
84
85int ff_intel_h263_decode_picture_header(MpegEncContext *s);
86int ff_h263_decode_mb(MpegEncContext *s,
87 int16_t block[6][64]);
88
89/**
90 * Return the value of the 3-bit "source format" syntax element.
91 * This represents some standard picture dimensions or indicates that
92 * width&height are explicitly stored later.
93 */
94int av_const h263_get_picture_format(int width, int height);
95
96void ff_clean_h263_qscales(MpegEncContext *s);
97int ff_h263_resync(MpegEncContext *s);
98void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
99
100
101static inline int h263_get_motion_length(int val, int f_code){
102 int l, bit_size, code;
103
104 if (val == 0) {
105 return ff_mvtab[0][1];
106 } else {
107 bit_size = f_code - 1;
108 /* modulo encoding */
109 l= INT_BIT - 6 - bit_size;
110 val = (val<<l)>>l;
111 val--;
112 code = (val >> bit_size) + 1;
113
114 return ff_mvtab[code][1] + 1 + bit_size;
115 }
116}
117
118static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
119 if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
120 skip_put_bits(&s->pb,
121 h263_get_motion_length(x, f_code)
122 +h263_get_motion_length(y, f_code));
123 }else{
124 ff_h263_encode_motion(&s->pb, x, f_code);
125 ff_h263_encode_motion(&s->pb, y, f_code);
126 }
127}
128
129static inline int get_p_cbp(MpegEncContext * s,
130 int16_t block[6][64],
131 int motion_x, int motion_y){
132 int cbp, i;
133
134 if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
135 int best_cbpy_score= INT_MAX;
136 int best_cbpc_score= INT_MAX;
137 int cbpc = (-1), cbpy= (-1);
138 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
139 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
140
141 for(i=0; i<4; i++){
142 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
143 if(i&1) score += s->coded_score[5];
144 if(i&2) score += s->coded_score[4];
145
146 if(score < best_cbpc_score){
147 best_cbpc_score= score;
148 cbpc= i;
149 }
150 }
151
152 for(i=0; i<16; i++){
153 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
154 if(i&1) score += s->coded_score[3];
155 if(i&2) score += s->coded_score[2];
156 if(i&4) score += s->coded_score[1];
157 if(i&8) score += s->coded_score[0];
158
159 if(score < best_cbpy_score){
160 best_cbpy_score= score;
161 cbpy= i;
162 }
163 }
164 cbp= cbpc + 4*cbpy;
165 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
166 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
167 cbp= 0;
168 }
169
170 for (i = 0; i < 6; i++) {
171 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
172 s->block_last_index[i]= -1;
173 s->bdsp.clear_block(s->block[i]);
174 }
175 }
176 }else{
177 cbp= 0;
178 for (i = 0; i < 6; i++) {
179 if (s->block_last_index[i] >= 0)
180 cbp |= 1 << (5 - i);
181 }
182 }
183 return cbp;
184}
185
186#endif /* AVCODEC_H263_H */
187
generated by cgit at 2024-05-17 05:14:31 (GMT)