libavcodec/h263.h

   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
  52 extern VLC ff_h263_intra_MCBPC_vlc;
  53 extern VLC ff_h263_inter_MCBPC_vlc;
  54 extern VLC ff_h263_cbpy_vlc;
  55
  56 extern RLTable ff_h263_rl_inter;
  57
  58 extern RLTable ff_rl_intra_aic;
  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
  65 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  66
  67
  68 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
  69 av_const int ff_h263_aspect_to_info(AVRational aspect);
  70 int ff_h263_decode_init(AVCodecContext *avctx);
  71 int ff_h263_decode_frame(AVCodecContext *avctx,
  72                              void *data, int *got_frame,
  73                              AVPacket *avpkt);
  74 int ff_h263_decode_end(AVCodecContext *avctx);
  75 void ff_h263_encode_mb(MpegEncContext *s,
  76                        int16_t 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);
  82 void ff_h263_encode_init(MpegEncContext *s);
  83 void ff_h263_decode_init_vlc(void);
  84 int ff_h263_decode_picture_header(MpegEncContext *s);
  85 int ff_h263_decode_gob_header(MpegEncContext *s);
  86 void ff_h263_update_motion_val(MpegEncContext * s);
  87 void ff_h263_loop_filter(MpegEncContext * s);
  88 int ff_h263_decode_mba(MpegEncContext *s);
  89 void ff_h263_encode_mba(MpegEncContext *s);
  90 void ff_init_qscale_tab(MpegEncContext *s);
  91 int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
  92 void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
  93
  94
  95 /**
  96  * Print picture info if FF_DEBUG_PICT_INFO is set.
  97  */
  98 void ff_h263_show_pict_info(MpegEncContext *s);
  99
 100 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
 101 int ff_h263_decode_mb(MpegEncContext *s,
 102                       int16_t block[6][64]);
 103
 104 /**
 105  * Return the value of the 3bit "source format" syntax element.
 106  * This represents some standard picture dimensions or indicates that
 107  * width&height are explicitly stored later.
 108  */
 109 int av_const h263_get_picture_format(int width, int height);
 110
 111 void ff_clean_h263_qscales(MpegEncContext *s);
 112 int ff_h263_resync(MpegEncContext *s);
 113 const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
 114 int ff_h263_get_gob_height(MpegEncContext *s);
 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                       int16_t 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 */