FFmpeg  2.1.1
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 // 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 
56 extern const uint16_t ff_inter_vlc[103][2];
57 extern const int8_t ff_inter_level[102];
58 extern const int8_t ff_inter_run[102];
59 
61 
63 
64 extern const uint16_t ff_h263_format[8][2];
65 extern const uint8_t ff_modified_quant_tab[2][32];
66 extern const uint16_t ff_mba_max[6];
67 extern const uint8_t ff_mba_length[7];
68 
70 
72 
73 
74 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
78  void *data, int *got_frame,
79  AVPacket *avpkt);
82  int16_t block[6][64],
83  int motion_x, int motion_y);
84 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
85 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
86 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
87  int *px, int *py);
89 void ff_h263_decode_init_vlc(void);
97 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
98 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
99 
100 
101 /**
102  * Print picture info if FF_DEBUG_PICT_INFO is set.
103  */
105 
108  int16_t block[6][64]);
109 
110 /**
111  * Return the value of the 3bit "source format" syntax element.
112  * This represents some standard picture dimensions or indicates that
113  * width&height are explicitly stored later.
114  */
116 
121 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
122 
123 
124 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
125  int l, bit_size, code;
126 
127  if (val == 0) {
128  return ff_mvtab[0][1];
129  } else {
130  bit_size = f_code - 1;
131  /* modulo encoding */
132  l= INT_BIT - 6 - bit_size;
133  val = (val<<l)>>l;
134  val--;
135  code = (val >> bit_size) + 1;
136 
137  return ff_mvtab[code][1] + 1 + bit_size;
138  }
139 }
140 
141 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
142  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
143  skip_put_bits(&s->pb,
144  h263_get_motion_length(s, x, f_code)
145  +h263_get_motion_length(s, y, f_code));
146  }else{
147  ff_h263_encode_motion(s, x, f_code);
148  ff_h263_encode_motion(s, y, f_code);
149  }
150 }
151 
152 static inline int get_p_cbp(MpegEncContext * s,
153  int16_t block[6][64],
154  int motion_x, int motion_y){
155  int cbp, i;
156 
157  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
158  int best_cbpy_score= INT_MAX;
159  int best_cbpc_score= INT_MAX;
160  int cbpc = (-1), cbpy= (-1);
161  const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
162  const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
163 
164  for(i=0; i<4; i++){
165  int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
166  if(i&1) score += s->coded_score[5];
167  if(i&2) score += s->coded_score[4];
168 
169  if(score < best_cbpc_score){
170  best_cbpc_score= score;
171  cbpc= i;
172  }
173  }
174 
175  for(i=0; i<16; i++){
176  int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
177  if(i&1) score += s->coded_score[3];
178  if(i&2) score += s->coded_score[2];
179  if(i&4) score += s->coded_score[1];
180  if(i&8) score += s->coded_score[0];
181 
182  if(score < best_cbpy_score){
183  best_cbpy_score= score;
184  cbpy= i;
185  }
186  }
187  cbp= cbpc + 4*cbpy;
188  if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
189  if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
190  cbp= 0;
191  }
192 
193  for (i = 0; i < 6; i++) {
194  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
195  s->block_last_index[i]= -1;
196  s->dsp.clear_block(s->block[i]);
197  }
198  }
199  }else{
200  cbp= 0;
201  for (i = 0; i < 6; i++) {
202  if (s->block_last_index[i] >= 0)
203  cbp |= 1 << (5 - i);
204  }
205  }
206  return cbp;
207 }
208 
209 static inline void memsetw(short *tab, int val, int n)
210 {
211  int i;
212  for(i=0;i<n;i++)
213  tab[i] = val;
214 }
215 
216 #endif /* AVCODEC_H263_H */
const char const char void * val
Definition: avisynth_c.h:671
const char * s
Definition: avisynth_c.h:668
const int8_t ff_inter_run[102]
Definition: h263data.h:146
const uint8_t ff_cbpc_b_tab[4][2]
Definition: h263data.h:78
const int8_t ff_inter_level[102]
Definition: h263data.h:130
void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number)
Definition: ituh263enc.c:101
void ff_h263_encode_init(MpegEncContext *s)
Definition: ituh263enc.c:769
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:92
RLTable ff_h263_rl_inter
Definition: h263data.h:162
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:94
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:228
int coded_score[12]
Definition: mpegvideo.h:493
mpegvideo header.
int mpv_flags
flags set by private options
Definition: mpegvideo.h:737
const uint16_t ff_h263_format[8][2]
Definition: h263data.h:239
#define FF_LAMBDA_SHIFT
Definition: avcodec.h:2255
RLTable.
Definition: rl.h:38
const uint8_t ff_modified_quant_tab[2][32]
Definition: h263data.h:253
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:312
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:604
#define FF_MPV_FLAG_CBP_RD
Definition: mpegvideo.h:759
#define av_const
Definition: avcodec.h:647
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:102
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
static const uint8_t offset[511][2]
Definition: vf_uspp.c:58
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
const uint8_t * ff_h263_find_resync_marker(MpegEncContext *s, const uint8_t *p, const uint8_t *end)
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:68
RLTable ff_rl_intra_aic
Definition: h263data.h:231
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:133
void ff_init_qscale_tab(MpegEncContext *s)
init s-&gt;current_picture.qscale_table from s-&gt;lambda_table
bitstream reader API header.
int ff_h263_pred_dc(MpegEncContext *s, int n, int16_t **dc_val_ptr)
Definition: h263.c:97
int flags2
AVCodecContext.flags2.
Definition: mpegvideo.h:265
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:379
const uint8_t ff_mba_length[7]
Definition: h263data.h:271
static void memsetw(short *tab, int val, int n)
Definition: h263.h:209
av_const int ff_h263_aspect_to_info(AVRational aspect)
Return the 4 bit value that specifies the given aspect ratio.
Definition: ituh263enc.c:87
rl header.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:66
Definition: get_bits.h:63
void ff_clean_h263_qscales(MpegEncContext *s)
modify qscale so that encoding is actually possible in h263 (limit difference to -2..2)
Definition: ituh263enc.c:272
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:44
void ff_h263_encode_motion(MpegEncContext *s, int val, int f_code)
Definition: ituh263enc.c:654
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:93
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:138
int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:368
int ff_h263_get_gob_height(MpegEncContext *s)
Get the GOB height based on picture height.
Definition: h263.c:374
float y
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:812
const uint16_t ff_mba_max[6]
Definition: h263data.h:267
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:295
int n
Definition: avisynth_c.h:588
const uint16_t ff_inter_vlc[103][2]
Definition: h263data.h:101
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 &quot;source format&quot; syntax element.
static const float pred[4]
Definition: siprdata.h:259
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:425
static int width
Definition: utils.c:158
unsigned int lambda2
(lambda*lambda) &gt;&gt; FF_LAMBDA_SHIFT
Definition: mpegvideo.h:376
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:45
uint8_t ff_h263_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: h263.c:42
main external API structure.
Definition: avcodec.h:1146
void ff_h263_encode_mba(MpegEncContext *s)
Definition: ituh263enc.c:830
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
void ff_h263_encode_gob_header(MpegEncContext *s, int mb_line)
Encode a group of blocks header.
Definition: ituh263enc.c:246
static int h263_get_motion_length(MpegEncContext *s, int val, int f_code)
Definition: h263.h:124
#define INT_BIT
Definition: internal.h:83
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:141
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:395
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:870
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
MpegEncContext.
Definition: mpegvideo.h:245
#define MAX_RUN
Definition: rl.h:34
PutBitContext pb
bit output
Definition: mpegvideo.h:318
void ff_h263_pred_acdc(MpegEncContext *s, int16_t *block, int n)
Definition: h263.c:225
#define CODEC_FLAG2_NO_OUTPUT
Skip bitstream encoding.
Definition: avcodec.h:721
void ff_h263_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
Definition: ituh263enc.c:453
void(* clear_block)(int16_t *block)
Definition: dsputil.h:142
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:130
int16_t(* block)[64]
points to one of the following blocks
Definition: mpegvideo.h:705
static int get_p_cbp(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
Definition: h263.h:152
static 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:70
This structure stores compressed data.
Definition: avcodec.h:1040
static int16_t block[64]
Definition: dct-test.c:198