h263.h
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1 /*
2  * H263 internal header
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; 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 // The defines below define the number of bits that are read at once for
30 // reading vlc values. Changing these may improve speed and data cache needs
31 // be aware though that decreasing them may need the number of stages that is
32 // passed to get_vlc* to be increased.
33 #define INTRA_MCBPC_VLC_BITS 6
34 #define INTER_MCBPC_VLC_BITS 7
35 #define CBPY_VLC_BITS 6
36 #define TEX_VLC_BITS 9
37 
38 extern const AVRational ff_h263_pixel_aspect[16];
39 extern const uint8_t ff_h263_cbpy_tab[16][2];
40 
41 extern const uint8_t ff_cbpc_b_tab[4][2];
42 
43 extern const uint8_t ff_mvtab[33][2];
44 
45 extern const uint8_t ff_h263_intra_MCBPC_code[9];
46 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
47 
48 extern const uint8_t ff_h263_inter_MCBPC_code[28];
49 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
50 extern const uint8_t ff_h263_mbtype_b_tab[15][2];
51 
54 extern VLC ff_h263_cbpy_vlc;
55 
57 
59 
60 extern const uint16_t ff_h263_format[8][2];
61 extern const uint8_t ff_modified_quant_tab[2][32];
62 extern uint16_t ff_mba_max[6];
63 extern uint8_t ff_mba_length[7];
64 
66 
67 
68 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
72  void *data, int *got_frame,
73  AVPacket *avpkt);
76  DCTELEM block[6][64],
77  int motion_x, int motion_y);
78 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
79 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
80 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
81  int *px, int *py);
91 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
93 
94 
99 
102  DCTELEM block[6][64]);
103 
110 
113 const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
115 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
116 
117 
118 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
119  int l, bit_size, code;
120 
121  if (val == 0) {
122  return ff_mvtab[0][1];
123  } else {
124  bit_size = f_code - 1;
125  /* modulo encoding */
126  l= INT_BIT - 6 - bit_size;
127  val = (val<<l)>>l;
128  val--;
129  code = (val >> bit_size) + 1;
130 
131  return ff_mvtab[code][1] + 1 + bit_size;
132  }
133 }
134 
135 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
136  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
137  skip_put_bits(&s->pb,
138  h263_get_motion_length(s, x, f_code)
139  +h263_get_motion_length(s, y, f_code));
140  }else{
141  ff_h263_encode_motion(s, x, f_code);
142  ff_h263_encode_motion(s, y, f_code);
143  }
144 }
145 
146 static inline int get_p_cbp(MpegEncContext * s,
147  DCTELEM block[6][64],
148  int motion_x, int motion_y){
149  int cbp, i;
150 
151  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
152  int best_cbpy_score= INT_MAX;
153  int best_cbpc_score= INT_MAX;
154  int cbpc = (-1), cbpy= (-1);
155  const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
156  const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
157 
158  for(i=0; i<4; i++){
159  int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
160  if(i&1) score += s->coded_score[5];
161  if(i&2) score += s->coded_score[4];
162 
163  if(score < best_cbpc_score){
164  best_cbpc_score= score;
165  cbpc= i;
166  }
167  }
168 
169  for(i=0; i<16; i++){
170  int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
171  if(i&1) score += s->coded_score[3];
172  if(i&2) score += s->coded_score[2];
173  if(i&4) score += s->coded_score[1];
174  if(i&8) score += s->coded_score[0];
175 
176  if(score < best_cbpy_score){
177  best_cbpy_score= score;
178  cbpy= i;
179  }
180  }
181  cbp= cbpc + 4*cbpy;
182  if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
183  if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
184  cbp= 0;
185  }
186 
187  for (i = 0; i < 6; i++) {
188  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
189  s->block_last_index[i]= -1;
190  s->dsp.clear_block(s->block[i]);
191  }
192  }
193  }else{
194  cbp= 0;
195  for (i = 0; i < 6; i++) {
196  if (s->block_last_index[i] >= 0)
197  cbp |= 1 << (5 - i);
198  }
199  }
200  return cbp;
201 }
202 
203 static inline void memsetw(short *tab, int val, int n)
204 {
205  int i;
206  for(i=0;i<n;i++)
207  tab[i] = val;
208 }
209 
210 #endif /* AVCODEC_H263_H */
void ff_h263_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
Definition: ituh263enc.c:457
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.h:78
void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number)
Definition: ituh263enc.c:105
void ff_h263_encode_init(MpegEncContext *s)
Definition: ituh263enc.c:771
int ff_h263_pred_dc(MpegEncContext *s, int n, int16_t **dc_val_ptr)
Definition: h263.c:101
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:94
RLTable ff_h263_rl_inter
Definition: h263data.h:162
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:96
const uint8_t ff_h263_intra_MCBPC_code[9]
Definition: h263data.h:36
const uint8_t ff_h263_cbpy_tab[16][2]
Definition: h263data.h:85
static void skip_put_bits(PutBitContext *s, int n)
Skip the given number of bits.
Definition: put_bits.h:222
mpegvideo header.
void ff_h263_decode_init_vlc(MpegEncContext *s)
Definition: ituh263dec.c:104
int mpv_flags
flags set by private options
Definition: mpegvideo.h:706
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
static int get_p_cbp(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
Definition: h263.h:146
RLTable.
Definition: rl.h:38
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.h:253
#define FF_MPV_FLAG_CBP_RD
Definition: mpegvideo.h:729
void ff_h263_pred_acdc(MpegEncContext *s, DCTELEM *block, int n)
Definition: h263.c:229
uint8_t ff_mba_length[7]
Definition: h263data.h:271
uint8_t
const uint8_t ff_h263_intra_MCBPC_bits[9]
Definition: h263data.h:37
const uint8_t ff_mvtab[33][2]
Definition: h263data.h:91
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:142
int ff_h263_get_gob_height(MpegEncContext *s)
Get the GOB height based on picture height.
Definition: h263.c:378
const uint8_t ff_h263_inter_MCBPC_bits[28]
Definition: h263data.h:50
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:25
const char data[16]
Definition: mxf.c:66
RLTable ff_rl_intra_aic
Definition: h263data.h:231
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:136
void ff_init_qscale_tab(MpegEncContext *s)
init s->current_picture.qscale_table from s->lambda_table
bitstream reader API header.
int flags2
AVCodecContext.flags2.
Definition: mpegvideo.h:231
const AVRational ff_h263_pixel_aspect[16]
Definition: h263data.h:280
#define MAX_LEVEL
Definition: rl.h:35
int dquant
qscale difference to prev qscale
Definition: mpegvideo.h:348
const uint8_t * ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end)
static void memsetw(short *tab, int val, int n)
Definition: h263.h:203
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263.c:46
av_const int ff_h263_aspect_to_info(AVRational aspect)
Return the 4 bit value that specifies the given aspect ratio.
Definition: ituh263enc.c:91
rl header.
void(* clear_block)(DCTELEM *block)
Definition: dsputil.h:218
Definition: get_bits.h:63
void ff_clean_h263_qscales(MpegEncContext *s)
modify qscale so that encoding is acually possible in h263 (limit difference to -2..2)
Definition: ituh263enc.c:276
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:45
void ff_h263_encode_motion(MpegEncContext *s, int val, int f_code)
Definition: ituh263enc.c:658
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:95
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:342
static DCTELEM block[64]
Definition: dct-test.c:169
int ff_h263_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
Definition: ituh263dec.c:601
int coded_score[8]
Definition: mpegvideo.h:457
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:261
const uint8_t ff_h263_inter_MCBPC_code[28]
Definition: h263data.h:41
int av_const h263_get_picture_format(int width, int height)
Return the value of the 3bit "source format" syntax element.
static const float pred[4]
Definition: siprdata.h:259
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:389
static int width
Definition: utils.c:156
unsigned int lambda2
(lambda*lambda) >> FF_LAMBDA_SHIFT
Definition: mpegvideo.h:345
main external API structure.
Definition: avcodec.h:1339
void ff_h263_encode_mba(MpegEncContext *s)
Definition: ituh263enc.c:832
void ff_h263_encode_gob_header(MpegEncContext *s, int mb_line)
Encode a group of blocks header.
Definition: ituh263enc.c:250
static int h263_get_motion_length(MpegEncContext *s, int val, int f_code)
Definition: h263.h:118
#define INT_BIT
Definition: internal.h:57
rational number numerator/denominator
Definition: rational.h:43
static void ff_h263_encode_motion_vector(MpegEncContext *s, int x, int y, int f_code)
Definition: h263.h:135
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:361
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:867
short DCTELEM
Definition: dsputil.h:39
DCTELEM(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:674
const uint8_t ff_h263_mbtype_b_tab[15][2]
Definition: h263data.h:60
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header.
Definition: ituh263dec.c:230
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:316
int height
Definition: gxfenc.c:72
MpegEncContext.
Definition: mpegvideo.h:211
#define MAX_RUN
Definition: rl.h:34
PutBitContext pb
bit output
Definition: mpegvideo.h:284
rational numbers
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:125
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:49
static const struct twinvq_data tab
int ff_h263_decode_gob_header(MpegEncContext *s)
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:272
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:72
This structure stores compressed data.
Definition: avcodec.h:898
uint16_t ff_mba_max[6]
Definition: h263data.h:267