Libav
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00001 /* 00002 * Copyright (c) 2002 The FFmpeg Project 00003 * 00004 * This file is part of FFmpeg. 00005 * 00006 * FFmpeg is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * FFmpeg is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with FFmpeg; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00021 #include "avcodec.h" 00022 #include "dsputil.h" 00023 #include "mpegvideo.h" 00024 #include "h263.h" 00025 #include "mathops.h" 00026 #include "msmpeg4.h" 00027 #include "msmpeg4data.h" 00028 #include "intrax8.h" 00029 #include "wmv2.h" 00030 00031 00032 static void parse_mb_skip(Wmv2Context * w){ 00033 int mb_x, mb_y; 00034 MpegEncContext * const s= &w->s; 00035 uint32_t * const mb_type= s->current_picture_ptr->mb_type; 00036 00037 w->skip_type= get_bits(&s->gb, 2); 00038 switch(w->skip_type){ 00039 case SKIP_TYPE_NONE: 00040 for(mb_y=0; mb_y<s->mb_height; mb_y++){ 00041 for(mb_x=0; mb_x<s->mb_width; mb_x++){ 00042 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0; 00043 } 00044 } 00045 break; 00046 case SKIP_TYPE_MPEG: 00047 for(mb_y=0; mb_y<s->mb_height; mb_y++){ 00048 for(mb_x=0; mb_x<s->mb_width; mb_x++){ 00049 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; 00050 } 00051 } 00052 break; 00053 case SKIP_TYPE_ROW: 00054 for(mb_y=0; mb_y<s->mb_height; mb_y++){ 00055 if(get_bits1(&s->gb)){ 00056 for(mb_x=0; mb_x<s->mb_width; mb_x++){ 00057 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; 00058 } 00059 }else{ 00060 for(mb_x=0; mb_x<s->mb_width; mb_x++){ 00061 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; 00062 } 00063 } 00064 } 00065 break; 00066 case SKIP_TYPE_COL: 00067 for(mb_x=0; mb_x<s->mb_width; mb_x++){ 00068 if(get_bits1(&s->gb)){ 00069 for(mb_y=0; mb_y<s->mb_height; mb_y++){ 00070 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; 00071 } 00072 }else{ 00073 for(mb_y=0; mb_y<s->mb_height; mb_y++){ 00074 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; 00075 } 00076 } 00077 } 00078 break; 00079 } 00080 } 00081 00082 static int decode_ext_header(Wmv2Context *w){ 00083 MpegEncContext * const s= &w->s; 00084 GetBitContext gb; 00085 int fps; 00086 int code; 00087 00088 if(s->avctx->extradata_size<4) return -1; 00089 00090 init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8); 00091 00092 fps = get_bits(&gb, 5); 00093 s->bit_rate = get_bits(&gb, 11)*1024; 00094 w->mspel_bit = get_bits1(&gb); 00095 s->loop_filter = get_bits1(&gb); 00096 w->abt_flag = get_bits1(&gb); 00097 w->j_type_bit = get_bits1(&gb); 00098 w->top_left_mv_flag= get_bits1(&gb); 00099 w->per_mb_rl_bit = get_bits1(&gb); 00100 code = get_bits(&gb, 3); 00101 00102 if(code==0) return -1; 00103 00104 s->slice_height = s->mb_height / code; 00105 00106 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 00107 av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n", 00108 fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter, 00109 code); 00110 } 00111 return 0; 00112 } 00113 00114 int ff_wmv2_decode_picture_header(MpegEncContext * s) 00115 { 00116 Wmv2Context * const w= (Wmv2Context*)s; 00117 int code; 00118 00119 #if 0 00120 { 00121 int i; 00122 for(i=0; i<s->gb.size*8; i++) 00123 printf("%d", get_bits1(&s->gb)); 00124 // get_bits1(&s->gb); 00125 printf("END\n"); 00126 return -1; 00127 } 00128 #endif 00129 if(s->picture_number==0) 00130 decode_ext_header(w); 00131 00132 s->pict_type = get_bits1(&s->gb) + 1; 00133 if(s->pict_type == FF_I_TYPE){ 00134 code = get_bits(&s->gb, 7); 00135 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code); 00136 } 00137 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); 00138 if(s->qscale <= 0) 00139 return -1; 00140 00141 return 0; 00142 } 00143 00144 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s) 00145 { 00146 Wmv2Context * const w= (Wmv2Context*)s; 00147 00148 if (s->pict_type == FF_I_TYPE) { 00149 if(w->j_type_bit) w->j_type= get_bits1(&s->gb); 00150 else w->j_type= 0; //FIXME check 00151 00152 if(!w->j_type){ 00153 if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb); 00154 else s->per_mb_rl_table= 0; 00155 00156 if(!s->per_mb_rl_table){ 00157 s->rl_chroma_table_index = decode012(&s->gb); 00158 s->rl_table_index = decode012(&s->gb); 00159 } 00160 00161 s->dc_table_index = get_bits1(&s->gb); 00162 } 00163 s->inter_intra_pred= 0; 00164 s->no_rounding = 1; 00165 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 00166 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n", 00167 s->qscale, 00168 s->rl_chroma_table_index, 00169 s->rl_table_index, 00170 s->dc_table_index, 00171 s->per_mb_rl_table, 00172 w->j_type); 00173 } 00174 }else{ 00175 int cbp_index; 00176 w->j_type=0; 00177 00178 parse_mb_skip(w); 00179 cbp_index= decode012(&s->gb); 00180 if(s->qscale <= 10){ 00181 int map[3]= {0,2,1}; 00182 w->cbp_table_index= map[cbp_index]; 00183 }else if(s->qscale <= 20){ 00184 int map[3]= {1,0,2}; 00185 w->cbp_table_index= map[cbp_index]; 00186 }else{ 00187 int map[3]= {2,1,0}; 00188 w->cbp_table_index= map[cbp_index]; 00189 } 00190 00191 if(w->mspel_bit) s->mspel= get_bits1(&s->gb); 00192 else s->mspel= 0; //FIXME check 00193 00194 if(w->abt_flag){ 00195 w->per_mb_abt= get_bits1(&s->gb)^1; 00196 if(!w->per_mb_abt){ 00197 w->abt_type= decode012(&s->gb); 00198 } 00199 } 00200 00201 if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb); 00202 else s->per_mb_rl_table= 0; 00203 00204 if(!s->per_mb_rl_table){ 00205 s->rl_table_index = decode012(&s->gb); 00206 s->rl_chroma_table_index = s->rl_table_index; 00207 } 00208 00209 s->dc_table_index = get_bits1(&s->gb); 00210 s->mv_table_index = get_bits1(&s->gb); 00211 00212 s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE); 00213 s->no_rounding ^= 1; 00214 00215 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 00216 av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n", 00217 s->rl_table_index, 00218 s->rl_chroma_table_index, 00219 s->dc_table_index, 00220 s->mv_table_index, 00221 s->per_mb_rl_table, 00222 s->qscale, 00223 s->mspel, 00224 w->per_mb_abt, 00225 w->abt_type, 00226 w->cbp_table_index, 00227 s->inter_intra_pred); 00228 } 00229 } 00230 s->esc3_level_length= 0; 00231 s->esc3_run_length= 0; 00232 00233 s->picture_number++; //FIXME ? 00234 00235 00236 if(w->j_type){ 00237 ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 ); 00238 return 1; 00239 } 00240 00241 return 0; 00242 } 00243 00244 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){ 00245 MpegEncContext * const s= &w->s; 00246 int ret; 00247 00248 ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr); 00249 00250 if(ret<0) return -1; 00251 00252 if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel) 00253 w->hshift= get_bits1(&s->gb); 00254 else 00255 w->hshift= 0; 00256 00257 //printf("%d %d ", *mx_ptr, *my_ptr); 00258 00259 return 0; 00260 } 00261 00262 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){ 00263 MpegEncContext * const s= &w->s; 00264 int xy, wrap, diff, type; 00265 int16_t *A, *B, *C, *mot_val; 00266 00267 wrap = s->b8_stride; 00268 xy = s->block_index[0]; 00269 00270 mot_val = s->current_picture.motion_val[0][xy]; 00271 00272 A = s->current_picture.motion_val[0][xy - 1]; 00273 B = s->current_picture.motion_val[0][xy - wrap]; 00274 C = s->current_picture.motion_val[0][xy + 2 - wrap]; 00275 00276 if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag) 00277 diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1])); 00278 else 00279 diff=0; 00280 00281 if(diff >= 8) 00282 type= get_bits1(&s->gb); 00283 else 00284 type= 2; 00285 00286 if(type == 0){ 00287 *px= A[0]; 00288 *py= A[1]; 00289 }else if(type == 1){ 00290 *px= B[0]; 00291 *py= B[1]; 00292 }else{ 00293 /* special case for first (slice) line */ 00294 if (s->first_slice_line) { 00295 *px = A[0]; 00296 *py = A[1]; 00297 } else { 00298 *px = mid_pred(A[0], B[0], C[0]); 00299 *py = mid_pred(A[1], B[1], C[1]); 00300 } 00301 } 00302 00303 return mot_val; 00304 } 00305 00306 static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){ 00307 MpegEncContext * const s= &w->s; 00308 static const int sub_cbp_table[3]= {2,3,1}; 00309 int sub_cbp; 00310 00311 if(!cbp){ 00312 s->block_last_index[n] = -1; 00313 00314 return 0; 00315 } 00316 00317 if(w->per_block_abt) 00318 w->abt_type= decode012(&s->gb); 00319 #if 0 00320 if(w->per_block_abt) 00321 printf("B%d", w->abt_type); 00322 #endif 00323 w->abt_type_table[n]= w->abt_type; 00324 00325 if(w->abt_type){ 00326 // const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated; 00327 const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable; 00328 // const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable; 00329 00330 sub_cbp= sub_cbp_table[ decode012(&s->gb) ]; 00331 // printf("S%d", sub_cbp); 00332 00333 if(sub_cbp&1){ 00334 if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0) 00335 return -1; 00336 } 00337 00338 if(sub_cbp&2){ 00339 if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0) 00340 return -1; 00341 } 00342 s->block_last_index[n] = 63; 00343 00344 return 0; 00345 }else{ 00346 return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated); 00347 } 00348 } 00349 00350 00351 int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64]) 00352 { 00353 Wmv2Context * const w= (Wmv2Context*)s; 00354 int cbp, code, i; 00355 uint8_t *coded_val; 00356 00357 if(w->j_type) return 0; 00358 00359 if (s->pict_type == FF_P_TYPE) { 00360 if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){ 00361 /* skip mb */ 00362 s->mb_intra = 0; 00363 for(i=0;i<6;i++) 00364 s->block_last_index[i] = -1; 00365 s->mv_dir = MV_DIR_FORWARD; 00366 s->mv_type = MV_TYPE_16X16; 00367 s->mv[0][0][0] = 0; 00368 s->mv[0][0][1] = 0; 00369 s->mb_skipped = 1; 00370 w->hshift=0; 00371 return 0; 00372 } 00373 00374 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3); 00375 if (code < 0) 00376 return -1; 00377 s->mb_intra = (~code & 0x40) >> 6; 00378 00379 cbp = code & 0x3f; 00380 } else { 00381 s->mb_intra = 1; 00382 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2); 00383 if (code < 0){ 00384 av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y); 00385 return -1; 00386 } 00387 /* predict coded block pattern */ 00388 cbp = 0; 00389 for(i=0;i<6;i++) { 00390 int val = ((code >> (5 - i)) & 1); 00391 if (i < 4) { 00392 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val); 00393 val = val ^ pred; 00394 *coded_val = val; 00395 } 00396 cbp |= val << (5 - i); 00397 } 00398 } 00399 00400 if (!s->mb_intra) { 00401 int mx, my; 00402 //printf("P at %d %d\n", s->mb_x, s->mb_y); 00403 wmv2_pred_motion(w, &mx, &my); 00404 00405 if(cbp){ 00406 s->dsp.clear_blocks(s->block[0]); 00407 if(s->per_mb_rl_table){ 00408 s->rl_table_index = decode012(&s->gb); 00409 s->rl_chroma_table_index = s->rl_table_index; 00410 } 00411 00412 if(w->abt_flag && w->per_mb_abt){ 00413 w->per_block_abt= get_bits1(&s->gb); 00414 if(!w->per_block_abt) 00415 w->abt_type= decode012(&s->gb); 00416 }else 00417 w->per_block_abt=0; 00418 } 00419 00420 if (wmv2_decode_motion(w, &mx, &my) < 0) 00421 return -1; 00422 00423 s->mv_dir = MV_DIR_FORWARD; 00424 s->mv_type = MV_TYPE_16X16; 00425 s->mv[0][0][0] = mx; 00426 s->mv[0][0][1] = my; 00427 00428 for (i = 0; i < 6; i++) { 00429 if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0) 00430 { 00431 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); 00432 return -1; 00433 } 00434 } 00435 } else { 00436 //if(s->pict_type==FF_P_TYPE) 00437 // printf("%d%d ", s->inter_intra_pred, cbp); 00438 //printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24)); 00439 s->ac_pred = get_bits1(&s->gb); 00440 if(s->inter_intra_pred){ 00441 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1); 00442 // printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y); 00443 } 00444 if(s->per_mb_rl_table && cbp){ 00445 s->rl_table_index = decode012(&s->gb); 00446 s->rl_chroma_table_index = s->rl_table_index; 00447 } 00448 00449 s->dsp.clear_blocks(s->block[0]); 00450 for (i = 0; i < 6; i++) { 00451 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0) 00452 { 00453 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); 00454 return -1; 00455 } 00456 } 00457 } 00458 00459 return 0; 00460 } 00461 00462 static av_cold int wmv2_decode_init(AVCodecContext *avctx){ 00463 Wmv2Context * const w= avctx->priv_data; 00464 00465 if(avctx->idct_algo==FF_IDCT_AUTO){ 00466 avctx->idct_algo=FF_IDCT_WMV2; 00467 } 00468 00469 if(ff_msmpeg4_decode_init(avctx) < 0) 00470 return -1; 00471 00472 ff_wmv2_common_init(w); 00473 00474 ff_intrax8_common_init(&w->x8,&w->s); 00475 00476 return 0; 00477 } 00478 00479 static av_cold int wmv2_decode_end(AVCodecContext *avctx) 00480 { 00481 Wmv2Context *w = avctx->priv_data; 00482 00483 ff_intrax8_common_end(&w->x8); 00484 return ff_h263_decode_end(avctx); 00485 } 00486 00487 AVCodec wmv2_decoder = { 00488 "wmv2", 00489 AVMEDIA_TYPE_VIDEO, 00490 CODEC_ID_WMV2, 00491 sizeof(Wmv2Context), 00492 wmv2_decode_init, 00493 NULL, 00494 wmv2_decode_end, 00495 ff_h263_decode_frame, 00496 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, 00497 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"), 00498 .pix_fmts= ff_pixfmt_list_420, 00499 };