Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2002 The Libav Project 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav 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 * Libav 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 Libav; 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, 32); 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(s->picture_number==0) 00120 decode_ext_header(w); 00121 00122 s->pict_type = get_bits1(&s->gb) + 1; 00123 if(s->pict_type == AV_PICTURE_TYPE_I){ 00124 code = get_bits(&s->gb, 7); 00125 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code); 00126 } 00127 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); 00128 if(s->qscale <= 0) 00129 return -1; 00130 00131 return 0; 00132 } 00133 00134 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s) 00135 { 00136 Wmv2Context * const w= (Wmv2Context*)s; 00137 00138 if (s->pict_type == AV_PICTURE_TYPE_I) { 00139 if(w->j_type_bit) w->j_type= get_bits1(&s->gb); 00140 else w->j_type= 0; //FIXME check 00141 00142 if(!w->j_type){ 00143 if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb); 00144 else s->per_mb_rl_table= 0; 00145 00146 if(!s->per_mb_rl_table){ 00147 s->rl_chroma_table_index = decode012(&s->gb); 00148 s->rl_table_index = decode012(&s->gb); 00149 } 00150 00151 s->dc_table_index = get_bits1(&s->gb); 00152 } 00153 s->inter_intra_pred= 0; 00154 s->no_rounding = 1; 00155 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 00156 av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n", 00157 s->qscale, 00158 s->rl_chroma_table_index, 00159 s->rl_table_index, 00160 s->dc_table_index, 00161 s->per_mb_rl_table, 00162 w->j_type); 00163 } 00164 }else{ 00165 int cbp_index; 00166 w->j_type=0; 00167 00168 parse_mb_skip(w); 00169 cbp_index= decode012(&s->gb); 00170 if(s->qscale <= 10){ 00171 int map[3]= {0,2,1}; 00172 w->cbp_table_index= map[cbp_index]; 00173 }else if(s->qscale <= 20){ 00174 int map[3]= {1,0,2}; 00175 w->cbp_table_index= map[cbp_index]; 00176 }else{ 00177 int map[3]= {2,1,0}; 00178 w->cbp_table_index= map[cbp_index]; 00179 } 00180 00181 if(w->mspel_bit) s->mspel= get_bits1(&s->gb); 00182 else s->mspel= 0; //FIXME check 00183 00184 if(w->abt_flag){ 00185 w->per_mb_abt= get_bits1(&s->gb)^1; 00186 if(!w->per_mb_abt){ 00187 w->abt_type= decode012(&s->gb); 00188 } 00189 } 00190 00191 if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb); 00192 else s->per_mb_rl_table= 0; 00193 00194 if(!s->per_mb_rl_table){ 00195 s->rl_table_index = decode012(&s->gb); 00196 s->rl_chroma_table_index = s->rl_table_index; 00197 } 00198 00199 s->dc_table_index = get_bits1(&s->gb); 00200 s->mv_table_index = get_bits1(&s->gb); 00201 00202 s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE); 00203 s->no_rounding ^= 1; 00204 00205 if(s->avctx->debug&FF_DEBUG_PICT_INFO){ 00206 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", 00207 s->rl_table_index, 00208 s->rl_chroma_table_index, 00209 s->dc_table_index, 00210 s->mv_table_index, 00211 s->per_mb_rl_table, 00212 s->qscale, 00213 s->mspel, 00214 w->per_mb_abt, 00215 w->abt_type, 00216 w->cbp_table_index, 00217 s->inter_intra_pred); 00218 } 00219 } 00220 s->esc3_level_length= 0; 00221 s->esc3_run_length= 0; 00222 00223 s->picture_number++; //FIXME ? 00224 00225 00226 if(w->j_type){ 00227 ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 ); 00228 return 1; 00229 } 00230 00231 return 0; 00232 } 00233 00234 static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){ 00235 MpegEncContext * const s= &w->s; 00236 int ret; 00237 00238 ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr); 00239 00240 if(ret<0) return -1; 00241 00242 if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel) 00243 w->hshift= get_bits1(&s->gb); 00244 else 00245 w->hshift= 0; 00246 00247 //printf("%d %d ", *mx_ptr, *my_ptr); 00248 00249 return 0; 00250 } 00251 00252 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){ 00253 MpegEncContext * const s= &w->s; 00254 int xy, wrap, diff, type; 00255 int16_t *A, *B, *C, *mot_val; 00256 00257 wrap = s->b8_stride; 00258 xy = s->block_index[0]; 00259 00260 mot_val = s->current_picture.motion_val[0][xy]; 00261 00262 A = s->current_picture.motion_val[0][xy - 1]; 00263 B = s->current_picture.motion_val[0][xy - wrap]; 00264 C = s->current_picture.motion_val[0][xy + 2 - wrap]; 00265 00266 if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag) 00267 diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1])); 00268 else 00269 diff=0; 00270 00271 if(diff >= 8) 00272 type= get_bits1(&s->gb); 00273 else 00274 type= 2; 00275 00276 if(type == 0){ 00277 *px= A[0]; 00278 *py= A[1]; 00279 }else if(type == 1){ 00280 *px= B[0]; 00281 *py= B[1]; 00282 }else{ 00283 /* special case for first (slice) line */ 00284 if (s->first_slice_line) { 00285 *px = A[0]; 00286 *py = A[1]; 00287 } else { 00288 *px = mid_pred(A[0], B[0], C[0]); 00289 *py = mid_pred(A[1], B[1], C[1]); 00290 } 00291 } 00292 00293 return mot_val; 00294 } 00295 00296 static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){ 00297 MpegEncContext * const s= &w->s; 00298 static const int sub_cbp_table[3]= {2,3,1}; 00299 int sub_cbp; 00300 00301 if(!cbp){ 00302 s->block_last_index[n] = -1; 00303 00304 return 0; 00305 } 00306 00307 if(w->per_block_abt) 00308 w->abt_type= decode012(&s->gb); 00309 w->abt_type_table[n]= w->abt_type; 00310 00311 if(w->abt_type){ 00312 // const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated; 00313 const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable; 00314 // const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable; 00315 00316 sub_cbp= sub_cbp_table[ decode012(&s->gb) ]; 00317 // printf("S%d", sub_cbp); 00318 00319 if(sub_cbp&1){ 00320 if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0) 00321 return -1; 00322 } 00323 00324 if(sub_cbp&2){ 00325 if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0) 00326 return -1; 00327 } 00328 s->block_last_index[n] = 63; 00329 00330 return 0; 00331 }else{ 00332 return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated); 00333 } 00334 } 00335 00336 00337 int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64]) 00338 { 00339 Wmv2Context * const w= (Wmv2Context*)s; 00340 int cbp, code, i; 00341 uint8_t *coded_val; 00342 00343 if(w->j_type) return 0; 00344 00345 if (s->pict_type == AV_PICTURE_TYPE_P) { 00346 if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){ 00347 /* skip mb */ 00348 s->mb_intra = 0; 00349 for(i=0;i<6;i++) 00350 s->block_last_index[i] = -1; 00351 s->mv_dir = MV_DIR_FORWARD; 00352 s->mv_type = MV_TYPE_16X16; 00353 s->mv[0][0][0] = 0; 00354 s->mv[0][0][1] = 0; 00355 s->mb_skipped = 1; 00356 w->hshift=0; 00357 return 0; 00358 } 00359 00360 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3); 00361 if (code < 0) 00362 return -1; 00363 s->mb_intra = (~code & 0x40) >> 6; 00364 00365 cbp = code & 0x3f; 00366 } else { 00367 s->mb_intra = 1; 00368 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2); 00369 if (code < 0){ 00370 av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y); 00371 return -1; 00372 } 00373 /* predict coded block pattern */ 00374 cbp = 0; 00375 for(i=0;i<6;i++) { 00376 int val = ((code >> (5 - i)) & 1); 00377 if (i < 4) { 00378 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val); 00379 val = val ^ pred; 00380 *coded_val = val; 00381 } 00382 cbp |= val << (5 - i); 00383 } 00384 } 00385 00386 if (!s->mb_intra) { 00387 int mx, my; 00388 //printf("P at %d %d\n", s->mb_x, s->mb_y); 00389 wmv2_pred_motion(w, &mx, &my); 00390 00391 if(cbp){ 00392 s->dsp.clear_blocks(s->block[0]); 00393 if(s->per_mb_rl_table){ 00394 s->rl_table_index = decode012(&s->gb); 00395 s->rl_chroma_table_index = s->rl_table_index; 00396 } 00397 00398 if(w->abt_flag && w->per_mb_abt){ 00399 w->per_block_abt= get_bits1(&s->gb); 00400 if(!w->per_block_abt) 00401 w->abt_type= decode012(&s->gb); 00402 }else 00403 w->per_block_abt=0; 00404 } 00405 00406 if (wmv2_decode_motion(w, &mx, &my) < 0) 00407 return -1; 00408 00409 s->mv_dir = MV_DIR_FORWARD; 00410 s->mv_type = MV_TYPE_16X16; 00411 s->mv[0][0][0] = mx; 00412 s->mv[0][0][1] = my; 00413 00414 for (i = 0; i < 6; i++) { 00415 if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0) 00416 { 00417 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); 00418 return -1; 00419 } 00420 } 00421 } else { 00422 //if(s->pict_type==AV_PICTURE_TYPE_P) 00423 // printf("%d%d ", s->inter_intra_pred, cbp); 00424 //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)); 00425 s->ac_pred = get_bits1(&s->gb); 00426 if(s->inter_intra_pred){ 00427 s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1); 00428 // printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y); 00429 } 00430 if(s->per_mb_rl_table && cbp){ 00431 s->rl_table_index = decode012(&s->gb); 00432 s->rl_chroma_table_index = s->rl_table_index; 00433 } 00434 00435 s->dsp.clear_blocks(s->block[0]); 00436 for (i = 0; i < 6; i++) { 00437 if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0) 00438 { 00439 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); 00440 return -1; 00441 } 00442 } 00443 } 00444 00445 return 0; 00446 } 00447 00448 static av_cold int wmv2_decode_init(AVCodecContext *avctx){ 00449 Wmv2Context * const w= avctx->priv_data; 00450 00451 if(avctx->idct_algo==FF_IDCT_AUTO){ 00452 avctx->idct_algo=FF_IDCT_WMV2; 00453 } 00454 00455 if(ff_msmpeg4_decode_init(avctx) < 0) 00456 return -1; 00457 00458 ff_wmv2_common_init(w); 00459 00460 ff_intrax8_common_init(&w->x8,&w->s); 00461 00462 return 0; 00463 } 00464 00465 static av_cold int wmv2_decode_end(AVCodecContext *avctx) 00466 { 00467 Wmv2Context *w = avctx->priv_data; 00468 00469 ff_intrax8_common_end(&w->x8); 00470 return ff_h263_decode_end(avctx); 00471 } 00472 00473 AVCodec ff_wmv2_decoder = { 00474 "wmv2", 00475 AVMEDIA_TYPE_VIDEO, 00476 CODEC_ID_WMV2, 00477 sizeof(Wmv2Context), 00478 wmv2_decode_init, 00479 NULL, 00480 wmv2_decode_end, 00481 ff_h263_decode_frame, 00482 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, 00483 .max_lowres = 3, 00484 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"), 00485 .pix_fmts= ff_pixfmt_list_420, 00486 };