FFmpeg: libavcodec/rv40.c Source File

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 
00043 static av_cold void rv40_init_tables(void)
00044 {
00045     int i;
00046 
00047     init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,
00048              rv40_aic_top_vlc_bits,  1, 1,
00049              rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_STATIC);
00050     for(i = 0; i < AIC_MODE1_NUM; i++){
00051         // Every tenth VLC table is empty
00052         if((i % 10) == 9) continue;
00053         init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,
00054                  aic_mode1_vlc_bits[i],  1, 1,
00055                  aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_STATIC);
00056     }
00057     for(i = 0; i < AIC_MODE2_NUM; i++){
00058         init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,
00059                  aic_mode2_vlc_bits[i],  1, 1,
00060                  aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_STATIC);
00061     }
00062     for(i = 0; i < NUM_PTYPE_VLCS; i++)
00063          init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,
00064                          ptype_vlc_bits[i],  1, 1,
00065                          ptype_vlc_codes[i], 1, 1,
00066                          ptype_vlc_syms,     1, 1, INIT_VLC_USE_STATIC);
00067     for(i = 0; i < NUM_BTYPE_VLCS; i++)
00068          init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,
00069                          btype_vlc_bits[i],  1, 1,
00070                          btype_vlc_codes[i], 1, 1,
00071                          btype_vlc_syms,     1, 1, INIT_VLC_USE_STATIC);
00072 }
00073 
00080 static int get_dimension(GetBitContext *gb, const int *dim)
00081 {
00082     int t   = get_bits(gb, 3);
00083     int val = dim[t];
00084     if(val < 0)
00085         val = dim[get_bits1(gb) - val];
00086     if(!val){
00087         do{
00088             t = get_bits(gb, 8);
00089             val += t << 2;
00090         }while(t == 0xFF);
00091     }
00092     return val;
00093 }
00094 
00098 static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)
00099 {
00100     *w = get_dimension(gb, rv40_standard_widths);
00101     *h = get_dimension(gb, rv40_standard_heights);
00102 }
00103 
00104 static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
00105 {
00106     int mb_bits;
00107     int w = r->s.width, h = r->s.height;
00108     int mb_size;
00109 
00110     memset(si, 0, sizeof(SliceInfo));
00111     if(get_bits1(gb))
00112         return -1;
00113     si->type = get_bits(gb, 2);
00114     if(si->type == 1) si->type = 0;
00115     si->quant = get_bits(gb, 5);
00116     if(get_bits(gb, 2))
00117         return -1;
00118     si->vlc_set = get_bits(gb, 2);
00119     skip_bits1(gb);
00120     si->pts = get_bits(gb, 13);
00121     if(!si->type || !get_bits1(gb))
00122         rv40_parse_picture_size(gb, &w, &h);
00123     if(avcodec_check_dimensions(r->s.avctx, w, h) < 0)
00124         return -1;
00125     si->width  = w;
00126     si->height = h;
00127     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
00128     mb_bits = ff_rv34_get_start_offset(gb, mb_size);
00129     si->start = get_bits(gb, mb_bits);
00130 
00131     return 0;
00132 }
00133 
00137 static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
00138 {
00139     MpegEncContext *s = &r->s;
00140     int i, j, k, v;
00141     int A, B, C;
00142     int pattern;
00143     int8_t *ptr;
00144 
00145     for(i = 0; i < 4; i++, dst += s->b4_stride){
00146         if(!i && s->first_slice_line){
00147             pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);
00148             dst[0] = (pattern >> 2) & 2;
00149             dst[1] = (pattern >> 1) & 2;
00150             dst[2] =  pattern       & 2;
00151             dst[3] = (pattern << 1) & 2;
00152             continue;
00153         }
00154         ptr = dst;
00155         for(j = 0; j < 4; j++){
00156             /* Coefficients are read using VLC chosen by the prediction pattern
00157              * The first one (used for retrieving a pair of coefficients) is
00158              * constructed from the top, top right and left coefficients
00159              * The second one (used for retrieving only one coefficient) is
00160              * top + 10 * left.
00161              */
00162             A = ptr[-s->b4_stride + 1]; // it won't be used for the last coefficient in a row
00163             B = ptr[-s->b4_stride];
00164             C = ptr[-1];
00165             pattern = A + (B << 4) + (C << 8);
00166             for(k = 0; k < MODE2_PATTERNS_NUM; k++)
00167                 if(pattern == rv40_aic_table_index[k])
00168                     break;
00169             if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients
00170                 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);
00171                 *ptr++ = v/9;
00172                 *ptr++ = v%9;
00173                 j++;
00174             }else{
00175                 if(B != -1 && C != -1)
00176                     v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);
00177                 else{ // tricky decoding
00178                     v = 0;
00179                     switch(C){
00180                     case -1: // code 0 -> 1, 1 -> 0
00181                         if(B < 2)
00182                             v = get_bits1(gb) ^ 1;
00183                         break;
00184                     case  0:
00185                     case  2: // code 0 -> 2, 1 -> 0
00186                         v = (get_bits1(gb) ^ 1) << 1;
00187                         break;
00188                     }
00189                 }
00190                 *ptr++ = v;
00191             }
00192         }
00193     }
00194     return 0;
00195 }
00196 
00200 static int rv40_decode_mb_info(RV34DecContext *r)
00201 {
00202     MpegEncContext *s = &r->s;
00203     GetBitContext *gb = &s->gb;
00204     int q, i;
00205     int prev_type = 0;
00206     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
00207     int blocks[RV34_MB_TYPES] = {0};
00208     int count = 0;
00209 
00210     if(!r->s.mb_skip_run) {
00211         r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;
00212         if(r->s.mb_skip_run > (unsigned)s->mb_num)
00213             return -1;
00214     }
00215 
00216     if(--r->s.mb_skip_run)
00217          return RV34_MB_SKIP;
00218 
00219     if(r->avail_cache[5-1])
00220         blocks[r->mb_type[mb_pos - 1]]++;
00221     if(r->avail_cache[5-4]){
00222         blocks[r->mb_type[mb_pos - s->mb_stride]]++;
00223         if(r->avail_cache[5-2])
00224             blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;
00225         if(r->avail_cache[5-5])
00226             blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;
00227     }
00228 
00229     for(i = 0; i < RV34_MB_TYPES; i++){
00230         if(blocks[i] > count){
00231             count = blocks[i];
00232             prev_type = i;
00233         }
00234     }
00235     if(s->pict_type == FF_P_TYPE){
00236         prev_type = block_num_to_ptype_vlc_num[prev_type];
00237         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
00238         if(q < PBTYPE_ESCAPE)
00239             return q;
00240         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
00241         av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");
00242     }else{
00243         prev_type = block_num_to_btype_vlc_num[prev_type];
00244         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
00245         if(q < PBTYPE_ESCAPE)
00246             return q;
00247         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
00248         av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");
00249     }
00250     return 0;
00251 }
00252 
00253 #define CLIP_SYMM(a, b) av_clip(a, -(b), b)
00254 
00257 static inline void rv40_weak_loop_filter(uint8_t *src, const int step,
00258                                          const int filter_p1, const int filter_q1,
00259                                          const int alpha, const int beta,
00260                                          const int lim_p0q0,
00261                                          const int lim_q1, const int lim_p1,
00262                                          const int diff_p1p0, const int diff_q1q0,
00263                                          const int diff_p1p2, const int diff_q1q2)
00264 {
00265     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00266     int t, u, diff;
00267 
00268     t = src[0*step] - src[-1*step];
00269     if(!t)
00270         return;
00271     u = (alpha * FFABS(t)) >> 7;
00272     if(u > 3 - (filter_p1 && filter_q1))
00273         return;
00274 
00275     t <<= 2;
00276     if(filter_p1 && filter_q1)
00277         t += src[-2*step] - src[1*step];
00278     diff = CLIP_SYMM((t + 4) >> 3, lim_p0q0);
00279     src[-1*step] = cm[src[-1*step] + diff];
00280     src[ 0*step] = cm[src[ 0*step] - diff];
00281     if(FFABS(diff_p1p2) <= beta && filter_p1){
00282         t = (diff_p1p0 + diff_p1p2 - diff) >> 1;
00283         src[-2*step] = cm[src[-2*step] - CLIP_SYMM(t, lim_p1)];
00284     }
00285     if(FFABS(diff_q1q2) <= beta && filter_q1){
00286         t = (diff_q1q0 + diff_q1q2 + diff) >> 1;
00287         src[ 1*step] = cm[src[ 1*step] - CLIP_SYMM(t, lim_q1)];
00288     }
00289 }
00290 
00291 static inline void rv40_adaptive_loop_filter(uint8_t *src, const int step,
00292                                              const int stride, const int dmode,
00293                                              const int lim_q1, const int lim_p1,
00294                                              const int alpha,
00295                                              const int beta, const int beta2,
00296                                              const int chroma, const int edge)
00297 {
00298     int diff_p1p0[4], diff_q1q0[4], diff_p1p2[4], diff_q1q2[4];
00299     int sum_p1p0 = 0, sum_q1q0 = 0, sum_p1p2 = 0, sum_q1q2 = 0;
00300     uint8_t *ptr;
00301     int flag_strong0 = 1, flag_strong1 = 1;
00302     int filter_p1, filter_q1;
00303     int i;
00304     int lims;
00305 
00306     for(i = 0, ptr = src; i < 4; i++, ptr += stride){
00307         diff_p1p0[i] = ptr[-2*step] - ptr[-1*step];
00308         diff_q1q0[i] = ptr[ 1*step] - ptr[ 0*step];
00309         sum_p1p0 += diff_p1p0[i];
00310         sum_q1q0 += diff_q1q0[i];
00311     }
00312     filter_p1 = FFABS(sum_p1p0) < (beta<<2);
00313     filter_q1 = FFABS(sum_q1q0) < (beta<<2);
00314     if(!filter_p1 && !filter_q1)
00315         return;
00316 
00317     for(i = 0, ptr = src; i < 4; i++, ptr += stride){
00318         diff_p1p2[i] = ptr[-2*step] - ptr[-3*step];
00319         diff_q1q2[i] = ptr[ 1*step] - ptr[ 2*step];
00320         sum_p1p2 += diff_p1p2[i];
00321         sum_q1q2 += diff_q1q2[i];
00322     }
00323 
00324     if(edge){
00325         flag_strong0 = filter_p1 && (FFABS(sum_p1p2) < beta2);
00326         flag_strong1 = filter_q1 && (FFABS(sum_q1q2) < beta2);
00327     }else{
00328         flag_strong0 = flag_strong1 = 0;
00329     }
00330 
00331     lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;
00332     if(flag_strong0 && flag_strong1){ /* strong filtering */
00333         for(i = 0; i < 4; i++, src += stride){
00334             int sflag, p0, q0, p1, q1;
00335             int t = src[0*step] - src[-1*step];
00336 
00337             if(!t) continue;
00338             sflag = (alpha * FFABS(t)) >> 7;
00339             if(sflag > 1) continue;
00340 
00341             p0 = (25*src[-3*step] + 26*src[-2*step]
00342                 + 26*src[-1*step]
00343                 + 26*src[ 0*step] + 25*src[ 1*step] + rv40_dither_l[dmode + i]) >> 7;
00344             q0 = (25*src[-2*step] + 26*src[-1*step]
00345                 + 26*src[ 0*step]
00346                 + 26*src[ 1*step] + 25*src[ 2*step] + rv40_dither_r[dmode + i]) >> 7;
00347             if(sflag){
00348                 p0 = av_clip(p0, src[-1*step] - lims, src[-1*step] + lims);
00349                 q0 = av_clip(q0, src[ 0*step] - lims, src[ 0*step] + lims);
00350             }
00351             p1 = (25*src[-4*step] + 26*src[-3*step]
00352                 + 26*src[-2*step]
00353                 + 26*p0           + 25*src[ 0*step] + rv40_dither_l[dmode + i]) >> 7;
00354             q1 = (25*src[-1*step] + 26*q0
00355                 + 26*src[ 1*step]
00356                 + 26*src[ 2*step] + 25*src[ 3*step] + rv40_dither_r[dmode + i]) >> 7;
00357             if(sflag){
00358                 p1 = av_clip(p1, src[-2*step] - lims, src[-2*step] + lims);
00359                 q1 = av_clip(q1, src[ 1*step] - lims, src[ 1*step] + lims);
00360             }
00361             src[-2*step] = p1;
00362             src[-1*step] = p0;
00363             src[ 0*step] = q0;
00364             src[ 1*step] = q1;
00365             if(!chroma){
00366                 src[-3*step] = (25*src[-1*step] + 26*src[-2*step] + 51*src[-3*step] + 26*src[-4*step] + 64) >> 7;
00367                 src[ 2*step] = (25*src[ 0*step] + 26*src[ 1*step] + 51*src[ 2*step] + 26*src[ 3*step] + 64) >> 7;
00368             }
00369         }
00370     }else if(filter_p1 && filter_q1){
00371         for(i = 0; i < 4; i++, src += stride)
00372             rv40_weak_loop_filter(src, step, 1, 1, alpha, beta, lims, lim_q1, lim_p1,
00373                                   diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
00374     }else{
00375         for(i = 0; i < 4; i++, src += stride)
00376             rv40_weak_loop_filter(src, step, filter_p1, filter_q1,
00377                                   alpha, beta, lims>>1, lim_q1>>1, lim_p1>>1,
00378                                   diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
00379     }
00380 }
00381 
00382 static void rv40_v_loop_filter(uint8_t *src, int stride, int dmode,
00383                                int lim_q1, int lim_p1,
00384                                int alpha, int beta, int beta2, int chroma, int edge){
00385     rv40_adaptive_loop_filter(src, 1, stride, dmode, lim_q1, lim_p1,
00386                               alpha, beta, beta2, chroma, edge);
00387 }
00388 static void rv40_h_loop_filter(uint8_t *src, int stride, int dmode,
00389                                int lim_q1, int lim_p1,
00390                                int alpha, int beta, int beta2, int chroma, int edge){
00391     rv40_adaptive_loop_filter(src, stride, 1, dmode, lim_q1, lim_p1,
00392                               alpha, beta, beta2, chroma, edge);
00393 }
00394 
00395 enum RV40BlockPos{
00396     POS_CUR,
00397     POS_TOP,
00398     POS_LEFT,
00399     POS_BOTTOM,
00400 };
00401 
00402 #define MASK_CUR          0x0001
00403 #define MASK_RIGHT        0x0008
00404 #define MASK_BOTTOM       0x0010
00405 #define MASK_TOP          0x1000
00406 #define MASK_Y_TOP_ROW    0x000F
00407 #define MASK_Y_LAST_ROW   0xF000
00408 #define MASK_Y_LEFT_COL   0x1111
00409 #define MASK_Y_RIGHT_COL  0x8888
00410 #define MASK_C_TOP_ROW    0x0003
00411 #define MASK_C_LAST_ROW   0x000C
00412 #define MASK_C_LEFT_COL   0x0005
00413 #define MASK_C_RIGHT_COL  0x000A
00414 
00415 static const int neighbour_offs_x[4] = { 0,  0, -1, 0 };
00416 static const int neighbour_offs_y[4] = { 0, -1,  0, 1 };
00417 
00421 static void rv40_loop_filter(RV34DecContext *r, int row)
00422 {
00423     MpegEncContext *s = &r->s;
00424     int mb_pos, mb_x;
00425     int i, j, k;
00426     uint8_t *Y, *C;
00427     int alpha, beta, betaY, betaC;
00428     int q;
00429     int mbtype[4];   
00430 
00434     int mb_strong[4];
00435     int clip[4];     
00436 
00442     int cbp[4];
00447     int uvcbp[4][2];
00453     int mvmasks[4];
00454 
00455     mb_pos = row * s->mb_stride;
00456     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
00457         int mbtype = s->current_picture_ptr->mb_type[mb_pos];
00458         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
00459             r->cbp_luma  [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;
00460         if(IS_INTRA(mbtype))
00461             r->cbp_chroma[mb_pos] = 0xFF;
00462     }
00463     mb_pos = row * s->mb_stride;
00464     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
00465         int y_h_deblock, y_v_deblock;
00466         int c_v_deblock[2], c_h_deblock[2];
00467         int clip_left;
00468         int avail[4];
00469         int y_to_deblock, c_to_deblock[2];
00470 
00471         q = s->current_picture_ptr->qscale_table[mb_pos];
00472         alpha = rv40_alpha_tab[q];
00473         beta  = rv40_beta_tab [q];
00474         betaY = betaC = beta * 3;
00475         if(s->width * s->height <= 176*144)
00476             betaY += beta;
00477 
00478         avail[0] = 1;
00479         avail[1] = row;
00480         avail[2] = mb_x;
00481         avail[3] = row < s->mb_height - 1;
00482         for(i = 0; i < 4; i++){
00483             if(avail[i]){
00484                 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;
00485                 mvmasks[i] = r->deblock_coefs[pos];
00486                 mbtype [i] = s->current_picture_ptr->mb_type[pos];
00487                 cbp    [i] = r->cbp_luma[pos];
00488                 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;
00489                 uvcbp[i][1] = r->cbp_chroma[pos] >> 4;
00490             }else{
00491                 mvmasks[i] = 0;
00492                 mbtype [i] = mbtype[0];
00493                 cbp    [i] = 0;
00494                 uvcbp[i][0] = uvcbp[i][1] = 0;
00495             }
00496             mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);
00497             clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];
00498         }
00499         y_to_deblock =  mvmasks[POS_CUR]
00500                      | (mvmasks[POS_BOTTOM] << 16);
00501         /* This pattern contains bits signalling that horizontal edges of
00502          * the current block can be filtered.
00503          * That happens when either of adjacent subblocks is coded or lies on
00504          * the edge of 8x8 blocks with motion vectors differing by more than
00505          * 3/4 pel in any component (any edge orientation for some reason).
00506          */
00507         y_h_deblock =   y_to_deblock
00508                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)
00509                     | ((cbp[POS_TOP]        & MASK_Y_LAST_ROW) >> 12);
00510         /* This pattern contains bits signalling that vertical edges of
00511          * the current block can be filtered.
00512          * That happens when either of adjacent subblocks is coded or lies on
00513          * the edge of 8x8 blocks with motion vectors differing by more than
00514          * 3/4 pel in any component (any edge orientation for some reason).
00515          */
00516         y_v_deblock =   y_to_deblock
00517                     | ((cbp[POS_CUR]                      << 1) & ~MASK_Y_LEFT_COL)
00518                     | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);
00519         if(!mb_x)
00520             y_v_deblock &= ~MASK_Y_LEFT_COL;
00521         if(!row)
00522             y_h_deblock &= ~MASK_Y_TOP_ROW;
00523         if(row == s->mb_height - 1 || (mb_strong[POS_CUR] || mb_strong[POS_BOTTOM]))
00524             y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);
00525         /* Calculating chroma patterns is similar and easier since there is
00526          * no motion vector pattern for them.
00527          */
00528         for(i = 0; i < 2; i++){
00529             c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];
00530             c_v_deblock[i] =   c_to_deblock[i]
00531                            | ((uvcbp[POS_CUR] [i]                       << 1) & ~MASK_C_LEFT_COL)
00532                            | ((uvcbp[POS_LEFT][i]   & MASK_C_RIGHT_COL) >> 1);
00533             c_h_deblock[i] =   c_to_deblock[i]
00534                            | ((uvcbp[POS_TOP][i]    & MASK_C_LAST_ROW)  >> 2)
00535                            |  (uvcbp[POS_CUR][i]                        << 2);
00536             if(!mb_x)
00537                 c_v_deblock[i] &= ~MASK_C_LEFT_COL;
00538             if(!row)
00539                 c_h_deblock[i] &= ~MASK_C_TOP_ROW;
00540             if(row == s->mb_height - 1 || mb_strong[POS_CUR] || mb_strong[POS_BOTTOM])
00541                 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);
00542         }
00543 
00544         for(j = 0; j < 16; j += 4){
00545             Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
00546             for(i = 0; i < 4; i++, Y += 4){
00547                 int ij = i + j;
00548                 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
00549                 int dither = j ? ij : i*4;
00550 
00551                 // if bottom block is coded then we can filter its top edge
00552                 // (or bottom edge of this block, which is the same)
00553                 if(y_h_deblock & (MASK_BOTTOM << ij)){
00554                     rv40_h_loop_filter(Y+4*s->linesize, s->linesize, dither,
00555                                        y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,
00556                                        clip_cur,
00557                                        alpha, beta, betaY, 0, 0);
00558                 }
00559                 // filter left block edge in ordinary mode (with low filtering strength)
00560                 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
00561                     if(!i)
00562                         clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
00563                     else
00564                         clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
00565                     rv40_v_loop_filter(Y, s->linesize, dither,
00566                                        clip_cur,
00567                                        clip_left,
00568                                        alpha, beta, betaY, 0, 0);
00569                 }
00570                 // filter top edge of the current macroblock when filtering strength is high
00571                 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
00572                     rv40_h_loop_filter(Y, s->linesize, dither,
00573                                        clip_cur,
00574                                        mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,
00575                                        alpha, beta, betaY, 0, 1);
00576                 }
00577                 // filter left block edge in edge mode (with high filtering strength)
00578                 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
00579                     clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
00580                     rv40_v_loop_filter(Y, s->linesize, dither,
00581                                        clip_cur,
00582                                        clip_left,
00583                                        alpha, beta, betaY, 0, 1);
00584                 }
00585             }
00586         }
00587         for(k = 0; k < 2; k++){
00588             for(j = 0; j < 2; j++){
00589                 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;
00590                 for(i = 0; i < 2; i++, C += 4){
00591                     int ij = i + j*2;
00592                     int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
00593                     if(c_h_deblock[k] & (MASK_CUR << (ij+2))){
00594                         int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;
00595                         rv40_h_loop_filter(C+4*s->uvlinesize, s->uvlinesize, i*8,
00596                                            clip_bot,
00597                                            clip_cur,
00598                                            alpha, beta, betaC, 1, 0);
00599                     }
00600                     if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
00601                         if(!i)
00602                             clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
00603                         else
00604                             clip_left = c_to_deblock[k]    & (MASK_CUR << (ij-1))  ? clip[POS_CUR]  : 0;
00605                         rv40_v_loop_filter(C, s->uvlinesize, j*8,
00606                                            clip_cur,
00607                                            clip_left,
00608                                            alpha, beta, betaC, 1, 0);
00609                     }
00610                     if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
00611                         int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;
00612                         rv40_h_loop_filter(C, s->uvlinesize, i*8,
00613                                            clip_cur,
00614                                            clip_top,
00615                                            alpha, beta, betaC, 1, 1);
00616                     }
00617                     if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
00618                         clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
00619                         rv40_v_loop_filter(C, s->uvlinesize, j*8,
00620                                            clip_cur,
00621                                            clip_left,
00622                                            alpha, beta, betaC, 1, 1);
00623                     }
00624                 }
00625             }
00626         }
00627     }
00628 }
00629 
00633 static av_cold int rv40_decode_init(AVCodecContext *avctx)
00634 {
00635     RV34DecContext *r = avctx->priv_data;
00636 
00637     r->rv30 = 0;
00638     ff_rv34_decode_init(avctx);
00639     if(!aic_top_vlc.bits)
00640         rv40_init_tables();
00641     r->parse_slice_header = rv40_parse_slice_header;
00642     r->decode_intra_types = rv40_decode_intra_types;
00643     r->decode_mb_info     = rv40_decode_mb_info;
00644     r->loop_filter        = rv40_loop_filter;
00645     r->luma_dc_quant_i = rv40_luma_dc_quant[0];
00646     r->luma_dc_quant_p = rv40_luma_dc_quant[1];
00647     return 0;
00648 }
00649 
00650 AVCodec rv40_decoder = {
00651     "rv40",
00652     CODEC_TYPE_VIDEO,
00653     CODEC_ID_RV40,
00654     sizeof(RV34DecContext),
00655     rv40_decode_init,
00656     NULL,
00657     ff_rv34_decode_end,
00658     ff_rv34_decode_frame,
00659     CODEC_CAP_DR1 | CODEC_CAP_DELAY,
00660     .flush = ff_mpeg_flush,
00661     .long_name = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),
00662     .pix_fmts= ff_pixfmt_list_420,
00663 };