1/* 2 * H263/MPEG4 backend for encoder and decoder 3 * Copyright (c) 2000,2001 Fabrice Bellard 4 * H263+ support. 5 * Copyright (c) 2001 Juan J. Sierralta P 6 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> 7 * 8 * This file is part of FFmpeg. 9 * 10 * FFmpeg is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * FFmpeg is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with FFmpeg; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25/** 26 * @file 27 * h263/mpeg4 codec. 28 */ 29 30#include <limits.h> 31 32#include "avcodec.h" 33#include "mpegvideo.h" 34#include "h263.h" 35#include "h263data.h" 36#include "mathops.h" 37#include "mpegutils.h" 38#include "unary.h" 39#include "flv.h" 40#include "mpeg4video.h" 41 42 43uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; 44 45 46void ff_h263_update_motion_val(MpegEncContext * s){ 47 const int mb_xy = s->mb_y * s->mb_stride + s->mb_x; 48 //FIXME a lot of that is only needed for !low_delay 49 const int wrap = s->b8_stride; 50 const int xy = s->block_index[0]; 51 52 s->current_picture.mbskip_table[mb_xy] = s->mb_skipped; 53 54 if(s->mv_type != MV_TYPE_8X8){ 55 int motion_x, motion_y; 56 if (s->mb_intra) { 57 motion_x = 0; 58 motion_y = 0; 59 } else if (s->mv_type == MV_TYPE_16X16) { 60 motion_x = s->mv[0][0][0]; 61 motion_y = s->mv[0][0][1]; 62 } else /*if (s->mv_type == MV_TYPE_FIELD)*/ { 63 int i; 64 motion_x = s->mv[0][0][0] + s->mv[0][1][0]; 65 motion_y = s->mv[0][0][1] + s->mv[0][1][1]; 66 motion_x = (motion_x>>1) | (motion_x&1); 67 for(i=0; i<2; i++){ 68 s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0]; 69 s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1]; 70 } 71 s->current_picture.ref_index[0][4*mb_xy ] = 72 s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0]; 73 s->current_picture.ref_index[0][4*mb_xy + 2] = 74 s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1]; 75 } 76 77 /* no update if 8X8 because it has been done during parsing */ 78 s->current_picture.motion_val[0][xy][0] = motion_x; 79 s->current_picture.motion_val[0][xy][1] = motion_y; 80 s->current_picture.motion_val[0][xy + 1][0] = motion_x; 81 s->current_picture.motion_val[0][xy + 1][1] = motion_y; 82 s->current_picture.motion_val[0][xy + wrap][0] = motion_x; 83 s->current_picture.motion_val[0][xy + wrap][1] = motion_y; 84 s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x; 85 s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y; 86 } 87 88 if(s->encoding){ //FIXME encoding MUST be cleaned up 89 if (s->mv_type == MV_TYPE_8X8) 90 s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8; 91 else if(s->mb_intra) 92 s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA; 93 else 94 s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16; 95 } 96} 97 98int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr) 99{ 100 int x, y, wrap, a, c, pred_dc; 101 int16_t *dc_val; 102 103 /* find prediction */ 104 if (n < 4) { 105 x = 2 * s->mb_x + (n & 1); 106 y = 2 * s->mb_y + ((n & 2) >> 1); 107 wrap = s->b8_stride; 108 dc_val = s->dc_val[0]; 109 } else { 110 x = s->mb_x; 111 y = s->mb_y; 112 wrap = s->mb_stride; 113 dc_val = s->dc_val[n - 4 + 1]; 114 } 115 /* B C 116 * A X 117 */ 118 a = dc_val[(x - 1) + (y) * wrap]; 119 c = dc_val[(x) + (y - 1) * wrap]; 120 121 /* No prediction outside GOB boundary */ 122 if(s->first_slice_line && n!=3){ 123 if(n!=2) c= 1024; 124 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024; 125 } 126 /* just DC prediction */ 127 if (a != 1024 && c != 1024) 128 pred_dc = (a + c) >> 1; 129 else if (a != 1024) 130 pred_dc = a; 131 else 132 pred_dc = c; 133 134 /* we assume pred is positive */ 135 *dc_val_ptr = &dc_val[x + y * wrap]; 136 return pred_dc; 137} 138 139void ff_h263_loop_filter(MpegEncContext * s){ 140 int qp_c; 141 const int linesize = s->linesize; 142 const int uvlinesize= s->uvlinesize; 143 const int xy = s->mb_y * s->mb_stride + s->mb_x; 144 uint8_t *dest_y = s->dest[0]; 145 uint8_t *dest_cb= s->dest[1]; 146 uint8_t *dest_cr= s->dest[2]; 147 148// if(s->pict_type==AV_PICTURE_TYPE_B && !s->readable) return; 149 150 /* 151 Diag Top 152 Left Center 153 */ 154 if (!IS_SKIP(s->current_picture.mb_type[xy])) { 155 qp_c= s->qscale; 156 s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize, linesize, qp_c); 157 s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c); 158 }else 159 qp_c= 0; 160 161 if(s->mb_y){ 162 int qp_dt, qp_tt, qp_tc; 163 164 if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride])) 165 qp_tt=0; 166 else 167 qp_tt = s->current_picture.qscale_table[xy - s->mb_stride]; 168 169 if(qp_c) 170 qp_tc= qp_c; 171 else 172 qp_tc= qp_tt; 173 174 if(qp_tc){ 175 const int chroma_qp= s->chroma_qscale_table[qp_tc]; 176 s->h263dsp.h263_v_loop_filter(dest_y, linesize, qp_tc); 177 s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc); 178 179 s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp); 180 s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp); 181 } 182 183 if(qp_tt) 184 s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize + 8, linesize, qp_tt); 185 186 if(s->mb_x){ 187 if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride])) 188 qp_dt= qp_tt; 189 else 190 qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride]; 191 192 if(qp_dt){ 193 const int chroma_qp= s->chroma_qscale_table[qp_dt]; 194 s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize, linesize, qp_dt); 195 s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp); 196 s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp); 197 } 198 } 199 } 200 201 if(qp_c){ 202 s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c); 203 if(s->mb_y + 1 == s->mb_height) 204 s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c); 205 } 206 207 if(s->mb_x){ 208 int qp_lc; 209 if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1])) 210 qp_lc= qp_c; 211 else 212 qp_lc = s->current_picture.qscale_table[xy - 1]; 213 214 if(qp_lc){ 215 s->h263dsp.h263_h_loop_filter(dest_y, linesize, qp_lc); 216 if(s->mb_y + 1 == s->mb_height){ 217 const int chroma_qp= s->chroma_qscale_table[qp_lc]; 218 s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc); 219 s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp); 220 s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp); 221 } 222 } 223 } 224} 225 226void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n) 227{ 228 int x, y, wrap, a, c, pred_dc, scale, i; 229 int16_t *dc_val, *ac_val, *ac_val1; 230 231 /* find prediction */ 232 if (n < 4) { 233 x = 2 * s->mb_x + (n & 1); 234 y = 2 * s->mb_y + (n>> 1); 235 wrap = s->b8_stride; 236 dc_val = s->dc_val[0]; 237 ac_val = s->ac_val[0][0]; 238 scale = s->y_dc_scale; 239 } else { 240 x = s->mb_x; 241 y = s->mb_y; 242 wrap = s->mb_stride; 243 dc_val = s->dc_val[n - 4 + 1]; 244 ac_val = s->ac_val[n - 4 + 1][0]; 245 scale = s->c_dc_scale; 246 } 247 248 ac_val += ((y) * wrap + (x)) * 16; 249 ac_val1 = ac_val; 250 251 /* B C 252 * A X 253 */ 254 a = dc_val[(x - 1) + (y) * wrap]; 255 c = dc_val[(x) + (y - 1) * wrap]; 256 257 /* No prediction outside GOB boundary */ 258 if(s->first_slice_line && n!=3){ 259 if(n!=2) c= 1024; 260 if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024; 261 } 262 263 if (s->ac_pred) { 264 pred_dc = 1024; 265 if (s->h263_aic_dir) { 266 /* left prediction */ 267 if (a != 1024) { 268 ac_val -= 16; 269 for(i=1;i<8;i++) { 270 block[s->idsp.idct_permutation[i << 3]] += ac_val[i]; 271 } 272 pred_dc = a; 273 } 274 } else { 275 /* top prediction */ 276 if (c != 1024) { 277 ac_val -= 16 * wrap; 278 for(i=1;i<8;i++) { 279 block[s->idsp.idct_permutation[i]] += ac_val[i + 8]; 280 } 281 pred_dc = c; 282 } 283 } 284 } else { 285 /* just DC prediction */ 286 if (a != 1024 && c != 1024) 287 pred_dc = (a + c) >> 1; 288 else if (a != 1024) 289 pred_dc = a; 290 else 291 pred_dc = c; 292 } 293 294 /* we assume pred is positive */ 295 block[0]=block[0]*scale + pred_dc; 296 297 if (block[0] < 0) 298 block[0] = 0; 299 else 300 block[0] |= 1; 301 302 /* Update AC/DC tables */ 303 dc_val[(x) + (y) * wrap] = block[0]; 304 305 /* left copy */ 306 for(i=1;i<8;i++) 307 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]]; 308 /* top copy */ 309 for(i=1;i<8;i++) 310 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]]; 311} 312 313int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir, 314 int *px, int *py) 315{ 316 int wrap; 317 int16_t *A, *B, *C, (*mot_val)[2]; 318 static const int off[4]= {2, 1, 1, -1}; 319 320 wrap = s->b8_stride; 321 mot_val = s->current_picture.motion_val[dir] + s->block_index[block]; 322 323 A = mot_val[ - 1]; 324 /* special case for first (slice) line */ 325 if (s->first_slice_line && block<3) { 326 // we can't just change some MVs to simulate that as we need them for the B frames (and ME) 327 // and if we ever support non rectangular objects than we need to do a few ifs here anyway :( 328 if(block==0){ //most common case 329 if(s->mb_x == s->resync_mb_x){ //rare 330 *px= *py = 0; 331 }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare 332 C = mot_val[off[block] - wrap]; 333 if(s->mb_x==0){ 334 *px = C[0]; 335 *py = C[1]; 336 }else{ 337 *px = mid_pred(A[0], 0, C[0]); 338 *py = mid_pred(A[1], 0, C[1]); 339 } 340 }else{ 341 *px = A[0]; 342 *py = A[1]; 343 } 344 }else if(block==1){ 345 if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare 346 C = mot_val[off[block] - wrap]; 347 *px = mid_pred(A[0], 0, C[0]); 348 *py = mid_pred(A[1], 0, C[1]); 349 }else{ 350 *px = A[0]; 351 *py = A[1]; 352 } 353 }else{ /* block==2*/ 354 B = mot_val[ - wrap]; 355 C = mot_val[off[block] - wrap]; 356 if(s->mb_x == s->resync_mb_x) //rare 357 A[0]=A[1]=0; 358 359 *px = mid_pred(A[0], B[0], C[0]); 360 *py = mid_pred(A[1], B[1], C[1]); 361 } 362 } else { 363 B = mot_val[ - wrap]; 364 C = mot_val[off[block] - wrap]; 365 *px = mid_pred(A[0], B[0], C[0]); 366 *py = mid_pred(A[1], B[1], C[1]); 367 } 368 return *mot_val; 369} 370 371 372/** 373 * Get the GOB height based on picture height. 374 */ 375int ff_h263_get_gob_height(MpegEncContext *s){ 376 if (s->height <= 400) 377 return 1; 378 else if (s->height <= 800) 379 return 2; 380 else 381 return 4; 382} 383