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libavcodec/rv40.c

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00001 /*
00002  * RV40 decoder
00003  * Copyright (c) 2007 Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "dsputil.h"
00029 #include "mpegvideo.h"
00030 #include "golomb.h"
00031 
00032 #include "rv34.h"
00033 #include "rv40vlc2.h"
00034 #include "rv40data.h"
00035 
00036 static VLC aic_top_vlc;
00037 static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM];
00038 static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS];
00039 
00040 static const int16_t mode2_offs[] = {
00041        0,  614, 1222, 1794, 2410,  3014,  3586,  4202,  4792, 5382, 5966, 6542,
00042     7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814
00043 };
00044 
00048 static av_cold void rv40_init_tables(void)
00049 {
00050     int i;
00051     static VLC_TYPE aic_table[1 << AIC_TOP_BITS][2];
00052     static VLC_TYPE aic_mode1_table[AIC_MODE1_NUM << AIC_MODE1_BITS][2];
00053     static VLC_TYPE aic_mode2_table[11814][2];
00054     static VLC_TYPE ptype_table[NUM_PTYPE_VLCS << PTYPE_VLC_BITS][2];
00055     static VLC_TYPE btype_table[NUM_BTYPE_VLCS << BTYPE_VLC_BITS][2];
00056 
00057     aic_top_vlc.table = aic_table;
00058     aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS;
00059     init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,
00060              rv40_aic_top_vlc_bits,  1, 1,
00061              rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00062     for(i = 0; i < AIC_MODE1_NUM; i++){
00063         // Every tenth VLC table is empty
00064         if((i % 10) == 9) continue;
00065         aic_mode1_vlc[i].table = &aic_mode1_table[i << AIC_MODE1_BITS];
00066         aic_mode1_vlc[i].table_allocated = 1 << AIC_MODE1_BITS;
00067         init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,
00068                  aic_mode1_vlc_bits[i],  1, 1,
00069                  aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00070     }
00071     for(i = 0; i < AIC_MODE2_NUM; i++){
00072         aic_mode2_vlc[i].table = &aic_mode2_table[mode2_offs[i]];
00073         aic_mode2_vlc[i].table_allocated = mode2_offs[i + 1] - mode2_offs[i];
00074         init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,
00075                  aic_mode2_vlc_bits[i],  1, 1,
00076                  aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
00077     }
00078     for(i = 0; i < NUM_PTYPE_VLCS; i++){
00079         ptype_vlc[i].table = &ptype_table[i << PTYPE_VLC_BITS];
00080         ptype_vlc[i].table_allocated = 1 << PTYPE_VLC_BITS;
00081         init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,
00082                          ptype_vlc_bits[i],  1, 1,
00083                          ptype_vlc_codes[i], 1, 1,
00084                          ptype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);
00085     }
00086     for(i = 0; i < NUM_BTYPE_VLCS; i++){
00087         btype_vlc[i].table = &btype_table[i << BTYPE_VLC_BITS];
00088         btype_vlc[i].table_allocated = 1 << BTYPE_VLC_BITS;
00089         init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,
00090                          btype_vlc_bits[i],  1, 1,
00091                          btype_vlc_codes[i], 1, 1,
00092                          btype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);
00093     }
00094 }
00095 
00102 static int get_dimension(GetBitContext *gb, const int *dim)
00103 {
00104     int t   = get_bits(gb, 3);
00105     int val = dim[t];
00106     if(val < 0)
00107         val = dim[get_bits1(gb) - val];
00108     if(!val){
00109         do{
00110             t = get_bits(gb, 8);
00111             val += t << 2;
00112         }while(t == 0xFF);
00113     }
00114     return val;
00115 }
00116 
00120 static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)
00121 {
00122     *w = get_dimension(gb, rv40_standard_widths);
00123     *h = get_dimension(gb, rv40_standard_heights);
00124 }
00125 
00126 static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
00127 {
00128     int mb_bits;
00129     int w = r->s.width, h = r->s.height;
00130     int mb_size;
00131 
00132     memset(si, 0, sizeof(SliceInfo));
00133     if(get_bits1(gb))
00134         return -1;
00135     si->type = get_bits(gb, 2);
00136     if(si->type == 1) si->type = 0;
00137     si->quant = get_bits(gb, 5);
00138     if(get_bits(gb, 2))
00139         return -1;
00140     si->vlc_set = get_bits(gb, 2);
00141     skip_bits1(gb);
00142     si->pts = get_bits(gb, 13);
00143     if(!si->type || !get_bits1(gb))
00144         rv40_parse_picture_size(gb, &w, &h);
00145     if(avcodec_check_dimensions(r->s.avctx, w, h) < 0)
00146         return -1;
00147     si->width  = w;
00148     si->height = h;
00149     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
00150     mb_bits = ff_rv34_get_start_offset(gb, mb_size);
00151     si->start = get_bits(gb, mb_bits);
00152 
00153     return 0;
00154 }
00155 
00159 static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
00160 {
00161     MpegEncContext *s = &r->s;
00162     int i, j, k, v;
00163     int A, B, C;
00164     int pattern;
00165     int8_t *ptr;
00166 
00167     for(i = 0; i < 4; i++, dst += r->intra_types_stride){
00168         if(!i && s->first_slice_line){
00169             pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);
00170             dst[0] = (pattern >> 2) & 2;
00171             dst[1] = (pattern >> 1) & 2;
00172             dst[2] =  pattern       & 2;
00173             dst[3] = (pattern << 1) & 2;
00174             continue;
00175         }
00176         ptr = dst;
00177         for(j = 0; j < 4; j++){
00178             /* Coefficients are read using VLC chosen by the prediction pattern
00179              * The first one (used for retrieving a pair of coefficients) is
00180              * constructed from the top, top right and left coefficients
00181              * The second one (used for retrieving only one coefficient) is
00182              * top + 10 * left.
00183              */
00184             A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row
00185             B = ptr[-r->intra_types_stride];
00186             C = ptr[-1];
00187             pattern = A + (B << 4) + (C << 8);
00188             for(k = 0; k < MODE2_PATTERNS_NUM; k++)
00189                 if(pattern == rv40_aic_table_index[k])
00190                     break;
00191             if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients
00192                 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);
00193                 *ptr++ = v/9;
00194                 *ptr++ = v%9;
00195                 j++;
00196             }else{
00197                 if(B != -1 && C != -1)
00198                     v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);
00199                 else{ // tricky decoding
00200                     v = 0;
00201                     switch(C){
00202                     case -1: // code 0 -> 1, 1 -> 0
00203                         if(B < 2)
00204                             v = get_bits1(gb) ^ 1;
00205                         break;
00206                     case  0:
00207                     case  2: // code 0 -> 2, 1 -> 0
00208                         v = (get_bits1(gb) ^ 1) << 1;
00209                         break;
00210                     }
00211                 }
00212                 *ptr++ = v;
00213             }
00214         }
00215     }
00216     return 0;
00217 }
00218 
00222 static int rv40_decode_mb_info(RV34DecContext *r)
00223 {
00224     MpegEncContext *s = &r->s;
00225     GetBitContext *gb = &s->gb;
00226     int q, i;
00227     int prev_type = 0;
00228     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
00229     int blocks[RV34_MB_TYPES] = {0};
00230     int count = 0;
00231 
00232     if(!r->s.mb_skip_run)
00233         r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;
00234 
00235     if(--r->s.mb_skip_run)
00236          return RV34_MB_SKIP;
00237 
00238     if(r->avail_cache[6-1])
00239         blocks[r->mb_type[mb_pos - 1]]++;
00240     if(r->avail_cache[6-4]){
00241         blocks[r->mb_type[mb_pos - s->mb_stride]]++;
00242         if(r->avail_cache[6-2])
00243             blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;
00244         if(r->avail_cache[6-5])
00245             blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;
00246     }
00247 
00248     for(i = 0; i < RV34_MB_TYPES; i++){
00249         if(blocks[i] > count){
00250             count = blocks[i];
00251             prev_type = i;
00252         }
00253     }
00254     if(s->pict_type == FF_P_TYPE){
00255         prev_type = block_num_to_ptype_vlc_num[prev_type];
00256         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
00257         if(q < PBTYPE_ESCAPE)
00258             return q;
00259         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
00260         av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");
00261     }else{
00262         prev_type = block_num_to_btype_vlc_num[prev_type];
00263         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
00264         if(q < PBTYPE_ESCAPE)
00265             return q;
00266         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
00267         av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");
00268     }
00269     return 0;
00270 }
00271 
00272 #define CLIP_SYMM(a, b) av_clip(a, -(b), b)
00273 
00276 static inline void rv40_weak_loop_filter(uint8_t *src, const int step,
00277                                          const int filter_p1, const int filter_q1,
00278                                          const int alpha, const int beta,
00279                                          const int lim_p0q0,
00280                                          const int lim_q1, const int lim_p1,
00281                                          const int diff_p1p0, const int diff_q1q0,
00282                                          const int diff_p1p2, const int diff_q1q2)
00283 {
00284     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00285     int t, u, diff;
00286 
00287     t = src[0*step] - src[-1*step];
00288     if(!t)
00289         return;
00290     u = (alpha * FFABS(t)) >> 7;
00291     if(u > 3 - (filter_p1 && filter_q1))
00292         return;
00293 
00294     t <<= 2;
00295     if(filter_p1 && filter_q1)
00296         t += src[-2*step] - src[1*step];
00297     diff = CLIP_SYMM((t + 4) >> 3, lim_p0q0);
00298     src[-1*step] = cm[src[-1*step] + diff];
00299     src[ 0*step] = cm[src[ 0*step] - diff];
00300     if(FFABS(diff_p1p2) <= beta && filter_p1){
00301         t = (diff_p1p0 + diff_p1p2 - diff) >> 1;
00302         src[-2*step] = cm[src[-2*step] - CLIP_SYMM(t, lim_p1)];
00303     }
00304     if(FFABS(diff_q1q2) <= beta && filter_q1){
00305         t = (diff_q1q0 + diff_q1q2 + diff) >> 1;
00306         src[ 1*step] = cm[src[ 1*step] - CLIP_SYMM(t, lim_q1)];
00307     }
00308 }
00309 
00310 static inline void rv40_adaptive_loop_filter(uint8_t *src, const int step,
00311                                              const int stride, const int dmode,
00312                                              const int lim_q1, const int lim_p1,
00313                                              const int alpha,
00314                                              const int beta, const int beta2,
00315                                              const int chroma, const int edge)
00316 {
00317     int diff_p1p0[4], diff_q1q0[4], diff_p1p2[4], diff_q1q2[4];
00318     int sum_p1p0 = 0, sum_q1q0 = 0, sum_p1p2 = 0, sum_q1q2 = 0;
00319     uint8_t *ptr;
00320     int flag_strong0 = 1, flag_strong1 = 1;
00321     int filter_p1, filter_q1;
00322     int i;
00323     int lims;
00324 
00325     for(i = 0, ptr = src; i < 4; i++, ptr += stride){
00326         diff_p1p0[i] = ptr[-2*step] - ptr[-1*step];
00327         diff_q1q0[i] = ptr[ 1*step] - ptr[ 0*step];
00328         sum_p1p0 += diff_p1p0[i];
00329         sum_q1q0 += diff_q1q0[i];
00330     }
00331     filter_p1 = FFABS(sum_p1p0) < (beta<<2);
00332     filter_q1 = FFABS(sum_q1q0) < (beta<<2);
00333     if(!filter_p1 && !filter_q1)
00334         return;
00335 
00336     for(i = 0, ptr = src; i < 4; i++, ptr += stride){
00337         diff_p1p2[i] = ptr[-2*step] - ptr[-3*step];
00338         diff_q1q2[i] = ptr[ 1*step] - ptr[ 2*step];
00339         sum_p1p2 += diff_p1p2[i];
00340         sum_q1q2 += diff_q1q2[i];
00341     }
00342 
00343     if(edge){
00344         flag_strong0 = filter_p1 && (FFABS(sum_p1p2) < beta2);
00345         flag_strong1 = filter_q1 && (FFABS(sum_q1q2) < beta2);
00346     }else{
00347         flag_strong0 = flag_strong1 = 0;
00348     }
00349 
00350     lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;
00351     if(flag_strong0 && flag_strong1){ /* strong filtering */
00352         for(i = 0; i < 4; i++, src += stride){
00353             int sflag, p0, q0, p1, q1;
00354             int t = src[0*step] - src[-1*step];
00355 
00356             if(!t) continue;
00357             sflag = (alpha * FFABS(t)) >> 7;
00358             if(sflag > 1) continue;
00359 
00360             p0 = (25*src[-3*step] + 26*src[-2*step]
00361                 + 26*src[-1*step]
00362                 + 26*src[ 0*step] + 25*src[ 1*step] + rv40_dither_l[dmode + i]) >> 7;
00363             q0 = (25*src[-2*step] + 26*src[-1*step]
00364                 + 26*src[ 0*step]
00365                 + 26*src[ 1*step] + 25*src[ 2*step] + rv40_dither_r[dmode + i]) >> 7;
00366             if(sflag){
00367                 p0 = av_clip(p0, src[-1*step] - lims, src[-1*step] + lims);
00368                 q0 = av_clip(q0, src[ 0*step] - lims, src[ 0*step] + lims);
00369             }
00370             p1 = (25*src[-4*step] + 26*src[-3*step]
00371                 + 26*src[-2*step]
00372                 + 26*p0           + 25*src[ 0*step] + rv40_dither_l[dmode + i]) >> 7;
00373             q1 = (25*src[-1*step] + 26*q0
00374                 + 26*src[ 1*step]
00375                 + 26*src[ 2*step] + 25*src[ 3*step] + rv40_dither_r[dmode + i]) >> 7;
00376             if(sflag){
00377                 p1 = av_clip(p1, src[-2*step] - lims, src[-2*step] + lims);
00378                 q1 = av_clip(q1, src[ 1*step] - lims, src[ 1*step] + lims);
00379             }
00380             src[-2*step] = p1;
00381             src[-1*step] = p0;
00382             src[ 0*step] = q0;
00383             src[ 1*step] = q1;
00384             if(!chroma){
00385                 src[-3*step] = (25*src[-1*step] + 26*src[-2*step] + 51*src[-3*step] + 26*src[-4*step] + 64) >> 7;
00386                 src[ 2*step] = (25*src[ 0*step] + 26*src[ 1*step] + 51*src[ 2*step] + 26*src[ 3*step] + 64) >> 7;
00387             }
00388         }
00389     }else if(filter_p1 && filter_q1){
00390         for(i = 0; i < 4; i++, src += stride)
00391             rv40_weak_loop_filter(src, step, 1, 1, alpha, beta, lims, lim_q1, lim_p1,
00392                                   diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
00393     }else{
00394         for(i = 0; i < 4; i++, src += stride)
00395             rv40_weak_loop_filter(src, step, filter_p1, filter_q1,
00396                                   alpha, beta, lims>>1, lim_q1>>1, lim_p1>>1,
00397                                   diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
00398     }
00399 }
00400 
00401 static void rv40_v_loop_filter(uint8_t *src, int stride, int dmode,
00402                                int lim_q1, int lim_p1,
00403                                int alpha, int beta, int beta2, int chroma, int edge){
00404     rv40_adaptive_loop_filter(src, 1, stride, dmode, lim_q1, lim_p1,
00405                               alpha, beta, beta2, chroma, edge);
00406 }
00407 static void rv40_h_loop_filter(uint8_t *src, int stride, int dmode,
00408                                int lim_q1, int lim_p1,
00409                                int alpha, int beta, int beta2, int chroma, int edge){
00410     rv40_adaptive_loop_filter(src, stride, 1, dmode, lim_q1, lim_p1,
00411                               alpha, beta, beta2, chroma, edge);
00412 }
00413 
00414 enum RV40BlockPos{
00415     POS_CUR,
00416     POS_TOP,
00417     POS_LEFT,
00418     POS_BOTTOM,
00419 };
00420 
00421 #define MASK_CUR          0x0001
00422 #define MASK_RIGHT        0x0008
00423 #define MASK_BOTTOM       0x0010
00424 #define MASK_TOP          0x1000
00425 #define MASK_Y_TOP_ROW    0x000F
00426 #define MASK_Y_LAST_ROW   0xF000
00427 #define MASK_Y_LEFT_COL   0x1111
00428 #define MASK_Y_RIGHT_COL  0x8888
00429 #define MASK_C_TOP_ROW    0x0003
00430 #define MASK_C_LAST_ROW   0x000C
00431 #define MASK_C_LEFT_COL   0x0005
00432 #define MASK_C_RIGHT_COL  0x000A
00433 
00434 static const int neighbour_offs_x[4] = { 0,  0, -1, 0 };
00435 static const int neighbour_offs_y[4] = { 0, -1,  0, 1 };
00436 
00440 static void rv40_loop_filter(RV34DecContext *r, int row)
00441 {
00442     MpegEncContext *s = &r->s;
00443     int mb_pos, mb_x;
00444     int i, j, k;
00445     uint8_t *Y, *C;
00446     int alpha, beta, betaY, betaC;
00447     int q;
00448     int mbtype[4];   
00449 
00453     int mb_strong[4];
00454     int clip[4];     
00455 
00461     int cbp[4];
00466     int uvcbp[4][2];
00472     int mvmasks[4];
00473 
00474     mb_pos = row * s->mb_stride;
00475     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
00476         int mbtype = s->current_picture_ptr->mb_type[mb_pos];
00477         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
00478             r->cbp_luma  [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;
00479         if(IS_INTRA(mbtype))
00480             r->cbp_chroma[mb_pos] = 0xFF;
00481     }
00482     mb_pos = row * s->mb_stride;
00483     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
00484         int y_h_deblock, y_v_deblock;
00485         int c_v_deblock[2], c_h_deblock[2];
00486         int clip_left;
00487         int avail[4];
00488         int y_to_deblock, c_to_deblock[2];
00489 
00490         q = s->current_picture_ptr->qscale_table[mb_pos];
00491         alpha = rv40_alpha_tab[q];
00492         beta  = rv40_beta_tab [q];
00493         betaY = betaC = beta * 3;
00494         if(s->width * s->height <= 176*144)
00495             betaY += beta;
00496 
00497         avail[0] = 1;
00498         avail[1] = row;
00499         avail[2] = mb_x;
00500         avail[3] = row < s->mb_height - 1;
00501         for(i = 0; i < 4; i++){
00502             if(avail[i]){
00503                 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;
00504                 mvmasks[i] = r->deblock_coefs[pos];
00505                 mbtype [i] = s->current_picture_ptr->mb_type[pos];
00506                 cbp    [i] = r->cbp_luma[pos];
00507                 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;
00508                 uvcbp[i][1] = r->cbp_chroma[pos] >> 4;
00509             }else{
00510                 mvmasks[i] = 0;
00511                 mbtype [i] = mbtype[0];
00512                 cbp    [i] = 0;
00513                 uvcbp[i][0] = uvcbp[i][1] = 0;
00514             }
00515             mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);
00516             clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];
00517         }
00518         y_to_deblock =  mvmasks[POS_CUR]
00519                      | (mvmasks[POS_BOTTOM] << 16);
00520         /* This pattern contains bits signalling that horizontal edges of
00521          * the current block can be filtered.
00522          * That happens when either of adjacent subblocks is coded or lies on
00523          * the edge of 8x8 blocks with motion vectors differing by more than
00524          * 3/4 pel in any component (any edge orientation for some reason).
00525          */
00526         y_h_deblock =   y_to_deblock
00527                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)
00528                     | ((cbp[POS_TOP]        & MASK_Y_LAST_ROW) >> 12);
00529         /* This pattern contains bits signalling that vertical edges of
00530          * the current block can be filtered.
00531          * That happens when either of adjacent subblocks is coded or lies on
00532          * the edge of 8x8 blocks with motion vectors differing by more than
00533          * 3/4 pel in any component (any edge orientation for some reason).
00534          */
00535         y_v_deblock =   y_to_deblock
00536                     | ((cbp[POS_CUR]                      << 1) & ~MASK_Y_LEFT_COL)
00537                     | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);
00538         if(!mb_x)
00539             y_v_deblock &= ~MASK_Y_LEFT_COL;
00540         if(!row)
00541             y_h_deblock &= ~MASK_Y_TOP_ROW;
00542         if(row == s->mb_height - 1 || (mb_strong[POS_CUR] || mb_strong[POS_BOTTOM]))
00543             y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);
00544         /* Calculating chroma patterns is similar and easier since there is
00545          * no motion vector pattern for them.
00546          */
00547         for(i = 0; i < 2; i++){
00548             c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];
00549             c_v_deblock[i] =   c_to_deblock[i]
00550                            | ((uvcbp[POS_CUR] [i]                       << 1) & ~MASK_C_LEFT_COL)
00551                            | ((uvcbp[POS_LEFT][i]   & MASK_C_RIGHT_COL) >> 1);
00552             c_h_deblock[i] =   c_to_deblock[i]
00553                            | ((uvcbp[POS_TOP][i]    & MASK_C_LAST_ROW)  >> 2)
00554                            |  (uvcbp[POS_CUR][i]                        << 2);
00555             if(!mb_x)
00556                 c_v_deblock[i] &= ~MASK_C_LEFT_COL;
00557             if(!row)
00558                 c_h_deblock[i] &= ~MASK_C_TOP_ROW;
00559             if(row == s->mb_height - 1 || mb_strong[POS_CUR] || mb_strong[POS_BOTTOM])
00560                 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);
00561         }
00562 
00563         for(j = 0; j < 16; j += 4){
00564             Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
00565             for(i = 0; i < 4; i++, Y += 4){
00566                 int ij = i + j;
00567                 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
00568                 int dither = j ? ij : i*4;
00569 
00570                 // if bottom block is coded then we can filter its top edge
00571                 // (or bottom edge of this block, which is the same)
00572                 if(y_h_deblock & (MASK_BOTTOM << ij)){
00573                     rv40_h_loop_filter(Y+4*s->linesize, s->linesize, dither,
00574                                        y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,
00575                                        clip_cur,
00576                                        alpha, beta, betaY, 0, 0);
00577                 }
00578                 // filter left block edge in ordinary mode (with low filtering strength)
00579                 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
00580                     if(!i)
00581                         clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
00582                     else
00583                         clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
00584                     rv40_v_loop_filter(Y, s->linesize, dither,
00585                                        clip_cur,
00586                                        clip_left,
00587                                        alpha, beta, betaY, 0, 0);
00588                 }
00589                 // filter top edge of the current macroblock when filtering strength is high
00590                 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
00591                     rv40_h_loop_filter(Y, s->linesize, dither,
00592                                        clip_cur,
00593                                        mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,
00594                                        alpha, beta, betaY, 0, 1);
00595                 }
00596                 // filter left block edge in edge mode (with high filtering strength)
00597                 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
00598                     clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
00599                     rv40_v_loop_filter(Y, s->linesize, dither,
00600                                        clip_cur,
00601                                        clip_left,
00602                                        alpha, beta, betaY, 0, 1);
00603                 }
00604             }
00605         }
00606         for(k = 0; k < 2; k++){
00607             for(j = 0; j < 2; j++){
00608                 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;
00609                 for(i = 0; i < 2; i++, C += 4){
00610                     int ij = i + j*2;
00611                     int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
00612                     if(c_h_deblock[k] & (MASK_CUR << (ij+2))){
00613                         int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;
00614                         rv40_h_loop_filter(C+4*s->uvlinesize, s->uvlinesize, i*8,
00615                                            clip_bot,
00616                                            clip_cur,
00617                                            alpha, beta, betaC, 1, 0);
00618                     }
00619                     if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
00620                         if(!i)
00621                             clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
00622                         else
00623                             clip_left = c_to_deblock[k]    & (MASK_CUR << (ij-1))  ? clip[POS_CUR]  : 0;
00624                         rv40_v_loop_filter(C, s->uvlinesize, j*8,
00625                                            clip_cur,
00626                                            clip_left,
00627                                            alpha, beta, betaC, 1, 0);
00628                     }
00629                     if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
00630                         int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;
00631                         rv40_h_loop_filter(C, s->uvlinesize, i*8,
00632                                            clip_cur,
00633                                            clip_top,
00634                                            alpha, beta, betaC, 1, 1);
00635                     }
00636                     if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
00637                         clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
00638                         rv40_v_loop_filter(C, s->uvlinesize, j*8,
00639                                            clip_cur,
00640                                            clip_left,
00641                                            alpha, beta, betaC, 1, 1);
00642                     }
00643                 }
00644             }
00645         }
00646     }
00647 }
00648 
00652 static av_cold int rv40_decode_init(AVCodecContext *avctx)
00653 {
00654     RV34DecContext *r = avctx->priv_data;
00655 
00656     r->rv30 = 0;
00657     ff_rv34_decode_init(avctx);
00658     if(!aic_top_vlc.bits)
00659         rv40_init_tables();
00660     r->parse_slice_header = rv40_parse_slice_header;
00661     r->decode_intra_types = rv40_decode_intra_types;
00662     r->decode_mb_info     = rv40_decode_mb_info;
00663     r->loop_filter        = rv40_loop_filter;
00664     r->luma_dc_quant_i = rv40_luma_dc_quant[0];
00665     r->luma_dc_quant_p = rv40_luma_dc_quant[1];
00666     return 0;
00667 }
00668 
00669 AVCodec rv40_decoder = {
00670     "rv40",
00671     AVMEDIA_TYPE_VIDEO,
00672     CODEC_ID_RV40,
00673     sizeof(RV34DecContext),
00674     rv40_decode_init,
00675     NULL,
00676     ff_rv34_decode_end,
00677     ff_rv34_decode_frame,
00678     CODEC_CAP_DR1 | CODEC_CAP_DELAY,
00679     .flush = ff_mpeg_flush,
00680     .long_name = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),
00681     .pix_fmts= ff_pixfmt_list_420,
00682 };

Generated on Fri Sep 16 2011 17:17:42 for FFmpeg by  doxygen 1.7.1