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
  33 // The defines below define the number of bits that are read at once for
  34 // reading vlc values. Changing these may improve speed and data cache needs
  35 // be aware though that decreasing them may need the number of stages that is
  36 // passed to get_vlc* to be increased.
  37 #define INTRA_MCBPC_VLC_BITS 6
  38 #define INTER_MCBPC_VLC_BITS 7
  39 #define CBPY_VLC_BITS 6
  40 #define TEX_VLC_BITS 9
  41
  42 extern const AVRational ff_h263_pixel_aspect[16];
  43 extern const uint8_t ff_h263_cbpy_tab[16][2];
  44
  45 extern const uint8_t ff_cbpc_b_tab[4][2];
  46
  47 extern const uint8_t ff_mvtab[33][2];
  48
  49 extern const uint8_t ff_h263_intra_MCBPC_code[9];
  50 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
  51
  52 extern const uint8_t ff_h263_inter_MCBPC_code[28];
  53 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
  54 extern const uint8_t ff_h263_mbtype_b_tab[15][2];
  55
  56 extern VLC ff_h263_intra_MCBPC_vlc;
  57 extern VLC ff_h263_inter_MCBPC_vlc;
  58 extern VLC ff_h263_cbpy_vlc;
  59
  60 extern const uint16_t ff_inter_vlc[103][2];
  61 extern const int8_t ff_inter_level[102];
  62 extern const int8_t ff_inter_run[102];
  63
  64 extern RLTable ff_h263_rl_inter;
  65
  66 extern RLTable ff_rl_intra_aic;
  67
  68 extern const uint16_t ff_h263_format[8][2];
  69 extern const uint8_t ff_modified_quant_tab[2][32];
  70 extern const uint16_t ff_mba_max[6];
  71 extern const uint8_t ff_mba_length[7];
  72
  73 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  74
  75 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
  76
  77
  78 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
  79 av_const int ff_h263_aspect_to_info(AVRational aspect);
  80 int ff_h263_decode_init(AVCodecContext *avctx);
  81 int ff_h263_decode_frame(AVCodecContext *avctx,
  82                              void *data, int *got_frame,
  83                              AVPacket *avpkt);
  84 int ff_h263_decode_end(AVCodecContext *avctx);
  85 void ff_h263_encode_mb(MpegEncContext *s,
  86                        int16_t block[6][64],
  87                        int motion_x, int motion_y);
  88 void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
  89 void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
  90 int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
  91                              int *px, int *py);
  92 void ff_h263_encode_init(MpegEncContext *s);
  93 void ff_h263_decode_init_vlc(void);
  94 int ff_h263_decode_picture_header(MpegEncContext *s);
  95 int ff_h263_decode_gob_header(MpegEncContext *s);
  96 void ff_h263_update_motion_val(MpegEncContext * s);
  97 void ff_h263_loop_filter(MpegEncContext * s);
  98 int ff_h263_decode_mba(MpegEncContext *s);
  99 void ff_h263_encode_mba(MpegEncContext *s);
 100 void ff_init_qscale_tab(MpegEncContext *s);
 101 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
 102 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
 103
 104
 105 /**
 106  * Print picture info if FF_DEBUG_PICT_INFO is set.
 107  */
 108 void ff_h263_show_pict_info(MpegEncContext *s);
 109
 110 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
 111 int ff_h263_decode_mb(MpegEncContext *s,
 112                       int16_t block[6][64]);
 113
 114 /**
 115  * Return the value of the 3bit "source format" syntax element.
 116  * This represents some standard picture dimensions or indicates that
 117  * width&height are explicitly stored later.
 118  */
 119 int av_const h263_get_picture_format(int width, int height);
 120
 121 void ff_clean_h263_qscales(MpegEncContext *s);
 122 int ff_h263_resync(MpegEncContext *s);
 123 int ff_h263_get_gob_height(MpegEncContext *s);
 124 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
 125
 126
 127 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
 128     int l, bit_size, code;
 129
 130     if (val == 0) {
 131         return ff_mvtab[0][1];
 132     } else {
 133         bit_size = f_code - 1;
 134         /* modulo encoding */
 135         l= INT_BIT - 6 - bit_size;
 136         val = (val<<l)>>l;
 137         val--;
 138         code = (val >> bit_size) + 1;
 139
 140         return ff_mvtab[code][1] + 1 + bit_size;
 141     }
 142 }
 143
 144 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
 145     if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 146         skip_put_bits(&s->pb,
 147             h263_get_motion_length(s, x, f_code)
 148            +h263_get_motion_length(s, y, f_code));
 149     }else{
 150         ff_h263_encode_motion(s, x, f_code);
 151         ff_h263_encode_motion(s, y, f_code);
 152     }
 153 }
 154
 155 static inline int get_p_cbp(MpegEncContext * s,
 156                       int16_t block[6][64],
 157                       int motion_x, int motion_y){
 158     int cbp, i;
 159
 160     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
 161         int best_cbpy_score= INT_MAX;
 162         int best_cbpc_score= INT_MAX;
 163         int cbpc = (-1), cbpy= (-1);
 164         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
 165         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 166
 167         for(i=0; i<4; i++){
 168             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
 169             if(i&1) score += s->coded_score[5];
 170             if(i&2) score += s->coded_score[4];
 171
 172             if(score < best_cbpc_score){
 173                 best_cbpc_score= score;
 174                 cbpc= i;
 175             }
 176         }
 177
 178         for(i=0; i<16; i++){
 179             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
 180             if(i&1) score += s->coded_score[3];
 181             if(i&2) score += s->coded_score[2];
 182             if(i&4) score += s->coded_score[1];
 183             if(i&8) score += s->coded_score[0];
 184
 185             if(score < best_cbpy_score){
 186                 best_cbpy_score= score;
 187                 cbpy= i;
 188             }
 189         }
 190         cbp= cbpc + 4*cbpy;
 191         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
 192             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
 193                 cbp= 0;
 194         }
 195
 196         for (i = 0; i < 6; i++) {
 197             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
 198                 s->block_last_index[i]= -1;
 199                 s->bdsp.clear_block(s->block[i]);
 200             }
 201         }
 202     }else{
 203         cbp= 0;
 204         for (i = 0; i < 6; i++) {
 205             if (s->block_last_index[i] >= 0)
 206                 cbp |= 1 << (5 - i);
 207         }
 208     }
 209     return cbp;
 210 }
 211
 212 static inline void memsetw(short *tab, int val, int n)
 213 {
 214     int i;
 215     for(i=0;i<n;i++)
 216         tab[i] = val;
 217 }
 218
 219 #endif /* AVCODEC_H263_H */