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 38extern const AVRational ff_h263_pixel_aspect[16]; 39extern const uint8_t ff_h263_cbpy_tab[16][2]; 40 41extern const uint8_t cbpc_b_tab[4][2]; 42 43extern const uint8_t mvtab[33][2]; 44 45extern const uint8_t ff_h263_intra_MCBPC_code[9]; 46extern const uint8_t ff_h263_intra_MCBPC_bits[9]; 47 48extern const uint8_t ff_h263_inter_MCBPC_code[28]; 49extern const uint8_t ff_h263_inter_MCBPC_bits[28]; 50extern const uint8_t h263_mbtype_b_tab[15][2]; 51 52extern VLC ff_h263_intra_MCBPC_vlc; 53extern VLC ff_h263_inter_MCBPC_vlc; 54extern VLC ff_h263_cbpy_vlc; 55 56extern RLTable ff_h263_rl_inter; 57 58extern RLTable rl_intra_aic; 59 60extern const uint16_t h263_format[8][2]; 61extern const uint8_t modified_quant_tab[2][32]; 62extern uint16_t ff_mba_max[6]; 63extern uint8_t ff_mba_length[7]; 64 65extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; 66 67 68int h263_decode_motion(MpegEncContext * s, int pred, int f_code); 69av_const int ff_h263_aspect_to_info(AVRational aspect); 70int ff_h263_decode_init(AVCodecContext *avctx); 71int ff_h263_decode_frame(AVCodecContext *avctx, 72 void *data, int *data_size, 73 AVPacket *avpkt); 74int ff_h263_decode_end(AVCodecContext *avctx); 75void h263_encode_mb(MpegEncContext *s, 76 DCTELEM block[6][64], 77 int motion_x, int motion_y); 78void h263_encode_picture_header(MpegEncContext *s, int picture_number); 79void h263_encode_gob_header(MpegEncContext * s, int mb_line); 80int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir, 81 int *px, int *py); 82void h263_encode_init(MpegEncContext *s); 83void h263_decode_init_vlc(MpegEncContext *s); 84int h263_decode_picture_header(MpegEncContext *s); 85int ff_h263_decode_gob_header(MpegEncContext *s); 86void ff_h263_update_motion_val(MpegEncContext * s); 87void ff_h263_loop_filter(MpegEncContext * s); 88int ff_h263_decode_mba(MpegEncContext *s); 89void ff_h263_encode_mba(MpegEncContext *s); 90void ff_init_qscale_tab(MpegEncContext *s); 91int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr); 92void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n); 93 94 95/** 96 * Prints picture info if FF_DEBUG_PICT_INFO is set. 97 */ 98void ff_h263_show_pict_info(MpegEncContext *s); 99 100int ff_intel_h263_decode_picture_header(MpegEncContext *s); 101int ff_h263_decode_mb(MpegEncContext *s, 102 DCTELEM block[6][64]); 103 104/** 105 * Returns the value of the 3bit "source format" syntax element. 106 * that represents some standard picture dimensions or indicates that 107 * width&height are explicitly stored later. 108 */ 109int av_const h263_get_picture_format(int width, int height); 110 111void ff_clean_h263_qscales(MpegEncContext *s); 112int ff_h263_resync(MpegEncContext *s); 113const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end); 114int ff_h263_get_gob_height(MpegEncContext *s); 115void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code); 116 117 118static 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 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 mvtab[code][1] + 1 + bit_size; 132 } 133} 134 135static 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 146static inline int get_p_cbp(MpegEncContext * s, 147 DCTELEM block[6][64], 148 int motion_x, int motion_y){ 149 int cbp, i; 150 151 if(s->flags & CODEC_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 203static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64], 204 int motion_x, int motion_y, int mb_type){ 205 int cbp=0, i; 206 207 if(s->flags & CODEC_FLAG_CBP_RD){ 208 int score=0; 209 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6); 210 211 for(i=0; i<6; i++){ 212 if(s->coded_score[i] < 0){ 213 score += s->coded_score[i]; 214 cbp |= 1 << (5 - i); 215 } 216 } 217 218 if(cbp){ 219 int zero_score= -6; 220 if ((motion_x | motion_y | s->dquant | mb_type) == 0){ 221 zero_score-= 4; //2*MV + mb_type + cbp bit 222 } 223 224 zero_score*= lambda; 225 if(zero_score <= score){ 226 cbp=0; 227 } 228 } 229 230 for (i = 0; i < 6; i++) { 231 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){ 232 s->block_last_index[i]= -1; 233 s->dsp.clear_block(s->block[i]); 234 } 235 } 236 }else{ 237 for (i = 0; i < 6; i++) { 238 if (s->block_last_index[i] >= 0) 239 cbp |= 1 << (5 - i); 240 } 241 } 242 return cbp; 243} 244 245static inline void memsetw(short *tab, int val, int n) 246{ 247 int i; 248 for(i=0;i<n;i++) 249 tab[i] = val; 250} 251#endif 252