FFmpeg: libavcodec/h263.h Source File

FFmpeg
h263.h
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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 #include <stdint.h>
24 #include "libavutil/rational.h"
25 #include "get_bits.h"
26 #include "mpegvideo.h"
27 #include "rl.h"
28 
29 #if !FF_API_ASPECT_EXTENDED
30  #define FF_ASPECT_EXTENDED 15
31 #endif
32  #define INT_BIT (CHAR_BIT * sizeof(int))
33 
34 // The defines below define the number of bits that are read at once for
35 // reading vlc values. Changing these may improve speed and data cache needs
36 // be aware though that decreasing them may need the number of stages that is
37 // passed to get_vlc* to be increased.
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 extern const AVRational ff_h263_pixel_aspect[16];
44 extern const uint8_t ff_h263_cbpy_tab[16][2];
45 
46 extern const uint8_t ff_cbpc_b_tab[4][2];
47 
48 extern const uint8_t ff_mvtab[33][2];
49 
50 extern const uint8_t ff_h263_intra_MCBPC_code[9];
51 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
52 
53 extern const uint8_t ff_h263_inter_MCBPC_code[28];
54 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
55 extern const uint8_t ff_h263_mbtype_b_tab[15][2];
56 
57 extern VLC ff_h263_intra_MCBPC_vlc;
58 extern VLC ff_h263_inter_MCBPC_vlc;
59 extern VLC ff_h263_cbpy_vlc;
60 
61 extern const uint16_t ff_inter_vlc[103][2];
62 extern const int8_t ff_inter_level[102];
63 extern const int8_t ff_inter_run[102];
64 
65 extern RLTable ff_h263_rl_inter;
66 
67 extern RLTable ff_rl_intra_aic;
68 
69 extern const uint16_t ff_h263_format[8][2];
70 extern const uint8_t ff_modified_quant_tab[2][32];
71 extern const uint16_t ff_mba_max[6];
72 extern const uint8_t ff_mba_length[7];
73 
74 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
75 
76 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
77 
78 
79 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
80 av_const int ff_h263_aspect_to_info(AVRational aspect);
81 int ff_h263_decode_init(AVCodecContext *avctx);
82 int ff_h263_decode_frame(AVCodecContext *avctx,
83  void *data, int *got_frame,
84  AVPacket *avpkt);
85 int ff_h263_decode_end(AVCodecContext *avctx);
86 void ff_h263_encode_mb(MpegEncContext *s,
87  int16_t block[6][64],
88  int motion_x, int motion_y);
89 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
90 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
91 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
92  int *px, int *py);
93 void ff_h263_encode_init(MpegEncContext *s);
94 void ff_h263_decode_init_vlc(void);
95 int ff_h263_decode_picture_header(MpegEncContext *s);
96 int ff_h263_decode_gob_header(MpegEncContext *s);
97 void ff_h263_update_motion_val(MpegEncContext * s);
98 void ff_h263_loop_filter(MpegEncContext * s);
99 int ff_h263_decode_mba(MpegEncContext *s);
100 void ff_h263_encode_mba(MpegEncContext *s);
101 void ff_init_qscale_tab(MpegEncContext *s);
102 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
103 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
104 
105 
106 /**
107  * Print picture info if FF_DEBUG_PICT_INFO is set.
108  */
109 void ff_h263_show_pict_info(MpegEncContext *s);
110 
111 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
112 int ff_h263_decode_mb(MpegEncContext *s,
113  int16_t block[6][64]);
114 
115 /**
116  * Return the value of the 3bit "source format" syntax element.
117  * This represents some standard picture dimensions or indicates that
118  * width&height are explicitly stored later.
119  */
120 int av_const h263_get_picture_format(int width, int height);
121 
122 void ff_clean_h263_qscales(MpegEncContext *s);
123 int ff_h263_resync(MpegEncContext *s);
124 int ff_h263_get_gob_height(MpegEncContext *s);
125 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
126 
127 
128  static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
129  int l, bit_size, code;
130 
131  if (val == 0) {
132  return ff_mvtab[0][1];
133  } else {
134  bit_size = f_code - 1;
135  /* modulo encoding */
136  l= INT_BIT - 6 - bit_size;
137  val = (val<<l)>>l;
138  val--;
139  code = (val >> bit_size) + 1;
140 
141  return ff_mvtab[code][1] + 1 + bit_size;
142  }
143 }
144 
145  static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
146  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
147  skip_put_bits(&s->pb,
148  h263_get_motion_length(s, x, f_code)
149  +h263_get_motion_length(s, y, f_code));
150  }else{
151  ff_h263_encode_motion(s, x, f_code);
152  ff_h263_encode_motion(s, y, f_code);
153  }
154 }
155 
156  static inline int get_p_cbp(MpegEncContext * s,
157  int16_t block[6][64],
158  int motion_x, int motion_y){
159  int cbp, i;
160 
161  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
162  int best_cbpy_score= INT_MAX;
163  int best_cbpc_score= INT_MAX;
164  int cbpc = (-1), cbpy= (-1);
165  const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
166  const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
167 
168  for(i=0; i<4; i++){
169  int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
170  if(i&1) score += s->coded_score[5];
171  if(i&2) score += s->coded_score[4];
172 
173  if(score < best_cbpc_score){
174  best_cbpc_score= score;
175  cbpc= i;
176  }
177  }
178 
179  for(i=0; i<16; i++){
180  int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
181  if(i&1) score += s->coded_score[3];
182  if(i&2) score += s->coded_score[2];
183  if(i&4) score += s->coded_score[1];
184  if(i&8) score += s->coded_score[0];
185 
186  if(score < best_cbpy_score){
187  best_cbpy_score= score;
188  cbpy= i;
189  }
190  }
191  cbp= cbpc + 4*cbpy;
192  if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
193  if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
194  cbp= 0;
195  }
196 
197  for (i = 0; i < 6; i++) {
198  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
199  s->block_last_index[i]= -1;
200  s->bdsp.clear_block(s->block[i]);
201  }
202  }
203  }else{
204  cbp= 0;
205  for (i = 0; i < 6; i++) {
206  if (s->block_last_index[i] >= 0)
207  cbp |= 1 << (5 - i);
208  }
209  }
210  return cbp;
211 }
212 
213  static inline void memsetw(short *tab, int val, int n)
214 {
215  int i;
216  for(i=0;i<n;i++)
217  tab[i] = val;
218 }
219 
220 #endif /* AVCODEC_H263_H */
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