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 // The defines below define the number of bits that are read at once for
  24 // reading vlc values. Changing these may improve speed and data cache needs
  25 // be aware though that decreasing them may need the number of stages that is
  26 // passed to get_vlc* to be increased.
  27 #define INTRA_MCBPC_VLC_BITS 6
  28 #define INTER_MCBPC_VLC_BITS 7
  29 #define CBPY_VLC_BITS 6
  30 #define TEX_VLC_BITS 9
  31
  32 extern const AVRational ff_h263_pixel_aspect[16];
  33 extern const uint8_t ff_h263_cbpy_tab[16][2];
  34
  35 extern const uint8_t cbpc_b_tab[4][2];
  36
  37 extern const uint8_t mvtab[33][2];
  38
  39 extern const uint8_t ff_h263_intra_MCBPC_code[9];
  40 extern const uint8_t ff_h263_intra_MCBPC_bits[9];
  41
  42 extern const uint8_t ff_h263_inter_MCBPC_code[28];
  43 extern const uint8_t ff_h263_inter_MCBPC_bits[28];
  44 extern const uint8_t h263_mbtype_b_tab[15][2];
  45
  46 extern VLC ff_h263_intra_MCBPC_vlc;
  47 extern VLC ff_h263_inter_MCBPC_vlc;
  48 extern VLC ff_h263_cbpy_vlc;
  49
  50 extern RLTable ff_h263_rl_inter;
  51
  52 extern RLTable rl_intra_aic;
  53
  54 extern const uint16_t h263_format[8][2];
  55 extern const uint8_t modified_quant_tab[2][32];
  56 extern uint16_t ff_mba_max[6];
  57 extern uint8_t ff_mba_length[7];
  58
  59 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  60
  61
  62 int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
  63 av_const int ff_h263_aspect_to_info(AVRational aspect);
  64 int ff_h263_decode_init(AVCodecContext *avctx);
  65 int ff_h263_decode_frame(AVCodecContext *avctx,
  66                              void *data, int *data_size,
  67                              AVPacket *avpkt);
  68 int ff_h263_decode_end(AVCodecContext *avctx);
  69 void h263_encode_mb(MpegEncContext *s,
  70                     DCTELEM block[6][64],
  71                     int motion_x, int motion_y);
  72 void h263_encode_picture_header(MpegEncContext *s, int picture_number);
  73 void h263_encode_gob_header(MpegEncContext * s, int mb_line);
  74 int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
  75                         int *px, int *py);
  76 void h263_encode_init(MpegEncContext *s);
  77 void h263_decode_init_vlc(MpegEncContext *s);
  78 int h263_decode_picture_header(MpegEncContext *s);
  79 int ff_h263_decode_gob_header(MpegEncContext *s);
  80 void ff_h263_update_motion_val(MpegEncContext * s);
  81 void ff_h263_loop_filter(MpegEncContext * s);
  82 int ff_h263_decode_mba(MpegEncContext *s);
  83 void ff_h263_encode_mba(MpegEncContext *s);
  84 void ff_init_qscale_tab(MpegEncContext *s);
  85 int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
  86 void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
  87
  88
  89 /**
  90  * Prints picture info if FF_DEBUG_PICT_INFO is set.
  91  */
  92 void ff_h263_show_pict_info(MpegEncContext *s);
  93
  94 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
  95 int ff_h263_decode_mb(MpegEncContext *s,
  96                       DCTELEM block[6][64]);
  97
  98 /**
  99  * Returns the value of the 3bit "source format" syntax element.
 100  * that represents some standard picture dimensions or indicates that
 101  * width&height are explicitly stored later.
 102  */
 103 int av_const h263_get_picture_format(int width, int height);
 104
 105 void ff_clean_h263_qscales(MpegEncContext *s);
 106 int ff_h263_resync(MpegEncContext *s);
 107 const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
 108 int ff_h263_get_gob_height(MpegEncContext *s);
 109 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
 110
 111
 112 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
 113     int l, bit_size, code;
 114
 115     if (val == 0) {
 116         return mvtab[0][1];
 117     } else {
 118         bit_size = f_code - 1;
 119         /* modulo encoding */
 120         l= INT_BIT - 6 - bit_size;
 121         val = (val<<l)>>l;
 122         val--;
 123         code = (val >> bit_size) + 1;
 124
 125         return mvtab[code][1] + 1 + bit_size;
 126     }
 127 }
 128
 129 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
 130     if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 131         skip_put_bits(&s->pb,
 132             h263_get_motion_length(s, x, f_code)
 133            +h263_get_motion_length(s, y, f_code));
 134     }else{
 135         ff_h263_encode_motion(s, x, f_code);
 136         ff_h263_encode_motion(s, y, f_code);
 137     }
 138 }
 139
 140 static inline int get_p_cbp(MpegEncContext * s,
 141                       DCTELEM block[6][64],
 142                       int motion_x, int motion_y){
 143     int cbp, i;
 144
 145     if(s->flags & CODEC_FLAG_CBP_RD){
 146         int best_cbpy_score= INT_MAX;
 147         int best_cbpc_score= INT_MAX;
 148         int cbpc = (-1), cbpy= (-1);
 149         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
 150         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 151
 152         for(i=0; i<4; i++){
 153             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
 154             if(i&1) score += s->coded_score[5];
 155             if(i&2) score += s->coded_score[4];
 156
 157             if(score < best_cbpc_score){
 158                 best_cbpc_score= score;
 159                 cbpc= i;
 160             }
 161         }
 162
 163         for(i=0; i<16; i++){
 164             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
 165             if(i&1) score += s->coded_score[3];
 166             if(i&2) score += s->coded_score[2];
 167             if(i&4) score += s->coded_score[1];
 168             if(i&8) score += s->coded_score[0];
 169
 170             if(score < best_cbpy_score){
 171                 best_cbpy_score= score;
 172                 cbpy= i;
 173             }
 174         }
 175         cbp= cbpc + 4*cbpy;
 176         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
 177             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
 178                 cbp= 0;
 179         }
 180
 181         for (i = 0; i < 6; i++) {
 182             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
 183                 s->block_last_index[i]= -1;
 184                 s->dsp.clear_block(s->block[i]);
 185             }
 186         }
 187     }else{
 188         cbp= 0;
 189         for (i = 0; i < 6; i++) {
 190             if (s->block_last_index[i] >= 0)
 191                 cbp |= 1 << (5 - i);
 192         }
 193     }
 194     return cbp;
 195 }
 196
 197 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
 198                             int motion_x, int motion_y, int mb_type){
 199     int cbp=0, i;
 200
 201     if(s->flags & CODEC_FLAG_CBP_RD){
 202         int score=0;
 203         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 204
 205         for(i=0; i<6; i++){
 206             if(s->coded_score[i] < 0){
 207                 score += s->coded_score[i];
 208                 cbp |= 1 << (5 - i);
 209             }
 210         }
 211
 212         if(cbp){
 213             int zero_score= -6;
 214             if ((motion_x | motion_y | s->dquant | mb_type) == 0){
 215                 zero_score-= 4; //2*MV + mb_type + cbp bit
 216             }
 217
 218             zero_score*= lambda;
 219             if(zero_score <= score){
 220                 cbp=0;
 221             }
 222         }
 223
 224         for (i = 0; i < 6; i++) {
 225             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
 226                 s->block_last_index[i]= -1;
 227                 s->dsp.clear_block(s->block[i]);
 228             }
 229         }
 230     }else{
 231         for (i = 0; i < 6; i++) {
 232             if (s->block_last_index[i] >= 0)
 233                 cbp |= 1 << (5 - i);
 234         }
 235     }
 236     return cbp;
 237 }
 238
 239 static inline void memsetw(short *tab, int val, int n)
 240 {
 241     int i;
 242     for(i=0;i<n;i++)
 243         tab[i] = val;
 244 }
 245 #endif