ffmpeg/libavcodec/h263.h

   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 */