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libavcodec/cavs.c

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00001 /*
00002  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
00003  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
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 
00028 #include "avcodec.h"
00029 #include "get_bits.h"
00030 #include "golomb.h"
00031 #include "mathops.h"
00032 #include "cavs.h"
00033 #include "cavsdata.h"
00034 
00035 /*****************************************************************************
00036  *
00037  * in-loop deblocking filter
00038  *
00039  ****************************************************************************/
00040 
00041 static inline int get_bs(cavs_vector *mvP, cavs_vector *mvQ, int b) {
00042     if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))
00043         return 2;
00044     if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )
00045         return 1;
00046     if(b){
00047         mvP += MV_BWD_OFFS;
00048         mvQ += MV_BWD_OFFS;
00049         if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )
00050             return 1;
00051     }else{
00052         if(mvP->ref != mvQ->ref)
00053             return 1;
00054     }
00055     return 0;
00056 }
00057 
00058 #define SET_PARAMS                                            \
00059     alpha = alpha_tab[av_clip(qp_avg + h->alpha_offset,0,63)];   \
00060     beta  =  beta_tab[av_clip(qp_avg + h->beta_offset, 0,63)];   \
00061     tc    =    tc_tab[av_clip(qp_avg + h->alpha_offset,0,63)];
00062 
00075 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type) {
00076     uint8_t bs[8];
00077     int qp_avg, alpha, beta, tc;
00078     int i;
00079 
00080     /* save un-deblocked lines */
00081     h->topleft_border_y = h->top_border_y[h->mbx*16+15];
00082     h->topleft_border_u = h->top_border_u[h->mbx*10+8];
00083     h->topleft_border_v = h->top_border_v[h->mbx*10+8];
00084     memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16);
00085     memcpy(&h->top_border_u[h->mbx*10+1], h->cu +  7* h->c_stride,8);
00086     memcpy(&h->top_border_v[h->mbx*10+1], h->cv +  7* h->c_stride,8);
00087     for(i=0;i<8;i++) {
00088         h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride);
00089         h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride);
00090         h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride);
00091         h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride);
00092     }
00093     if(!h->loop_filter_disable) {
00094         /* determine bs */
00095         if(mb_type == I_8X8)
00096             memset(bs,2,8);
00097         else{
00098             memset(bs,0,8);
00099             if(ff_cavs_partition_flags[mb_type] & SPLITV){
00100                 bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);
00101                 bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);
00102             }
00103             if(ff_cavs_partition_flags[mb_type] & SPLITH){
00104                 bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);
00105                 bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);
00106             }
00107             bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);
00108             bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);
00109             bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);
00110             bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);
00111         }
00112         if(AV_RN64(bs)) {
00113             if(h->flags & A_AVAIL) {
00114                 qp_avg = (h->qp + h->left_qp + 1) >> 1;
00115                 SET_PARAMS;
00116                 h->s.dsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]);
00117                 h->s.dsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
00118                 h->s.dsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
00119             }
00120             qp_avg = h->qp;
00121             SET_PARAMS;
00122             h->s.dsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]);
00123             h->s.dsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc,
00124                            bs[6],bs[7]);
00125 
00126             if(h->flags & B_AVAIL) {
00127                 qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;
00128                 SET_PARAMS;
00129                 h->s.dsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]);
00130                 h->s.dsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
00131                 h->s.dsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
00132             }
00133         }
00134     }
00135     h->left_qp = h->qp;
00136     h->top_qp[h->mbx] = h->qp;
00137 }
00138 
00139 #undef SET_PARAMS
00140 
00141 /*****************************************************************************
00142  *
00143  * spatial intra prediction
00144  *
00145  ****************************************************************************/
00146 
00147 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top,
00148                                         uint8_t **left, int block) {
00149     int i;
00150 
00151     switch(block) {
00152     case 0:
00153         *left = h->left_border_y;
00154         h->left_border_y[0] = h->left_border_y[1];
00155         memset(&h->left_border_y[17],h->left_border_y[16],9);
00156         memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
00157         top[17] = top[16];
00158         top[0] = top[1];
00159         if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
00160             h->left_border_y[0] = top[0] = h->topleft_border_y;
00161         break;
00162     case 1:
00163         *left = h->intern_border_y;
00164         for(i=0;i<8;i++)
00165             h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
00166         memset(&h->intern_border_y[9],h->intern_border_y[8],9);
00167         h->intern_border_y[0] = h->intern_border_y[1];
00168         memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
00169         if(h->flags & C_AVAIL)
00170             memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
00171         else
00172             memset(&top[9],top[8],9);
00173         top[17] = top[16];
00174         top[0] = top[1];
00175         if(h->flags & B_AVAIL)
00176             h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
00177         break;
00178     case 2:
00179         *left = &h->left_border_y[8];
00180         memcpy(&top[1],h->cy + 7*h->l_stride,16);
00181         top[17] = top[16];
00182         top[0] = top[1];
00183         if(h->flags & A_AVAIL)
00184             top[0] = h->left_border_y[8];
00185         break;
00186     case 3:
00187         *left = &h->intern_border_y[8];
00188         for(i=0;i<8;i++)
00189             h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
00190         memset(&h->intern_border_y[17],h->intern_border_y[16],9);
00191         memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
00192         memset(&top[9],top[8],9);
00193         break;
00194     }
00195 }
00196 
00197 void ff_cavs_load_intra_pred_chroma(AVSContext *h) {
00198     /* extend borders by one pixel */
00199     h->left_border_u[9] = h->left_border_u[8];
00200     h->left_border_v[9] = h->left_border_v[8];
00201     h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];
00202     h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];
00203     if(h->mbx && h->mby) {
00204         h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;
00205         h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;
00206     } else {
00207         h->left_border_u[0] = h->left_border_u[1];
00208         h->left_border_v[0] = h->left_border_v[1];
00209         h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];
00210         h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];
00211     }
00212 }
00213 
00214 static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00215     int y;
00216     uint64_t a = AV_RN64(&top[1]);
00217     for(y=0;y<8;y++) {
00218         *((uint64_t *)(d+y*stride)) = a;
00219     }
00220 }
00221 
00222 static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00223     int y;
00224     uint64_t a;
00225     for(y=0;y<8;y++) {
00226         a = left[y+1] * 0x0101010101010101ULL;
00227         *((uint64_t *)(d+y*stride)) = a;
00228     }
00229 }
00230 
00231 static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00232     int y;
00233     uint64_t a = 0x8080808080808080ULL;
00234     for(y=0;y<8;y++)
00235         *((uint64_t *)(d+y*stride)) = a;
00236 }
00237 
00238 static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00239     int x,y,ia;
00240     int ih = 0;
00241     int iv = 0;
00242     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
00243 
00244     for(x=0; x<4; x++) {
00245         ih += (x+1)*(top[5+x]-top[3-x]);
00246         iv += (x+1)*(left[5+x]-left[3-x]);
00247     }
00248     ia = (top[8]+left[8])<<4;
00249     ih = (17*ih+16)>>5;
00250     iv = (17*iv+16)>>5;
00251     for(y=0; y<8; y++)
00252         for(x=0; x<8; x++)
00253             d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5];
00254 }
00255 
00256 #define LOWPASS(ARRAY,INDEX)                                            \
00257     (( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2)
00258 
00259 static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00260     int x,y;
00261     for(y=0; y<8; y++)
00262         for(x=0; x<8; x++)
00263             d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1;
00264 }
00265 
00266 static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00267     int x,y;
00268     for(y=0; y<8; y++)
00269         for(x=0; x<8; x++)
00270             d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;
00271 }
00272 
00273 static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00274     int x,y;
00275     for(y=0; y<8; y++)
00276         for(x=0; x<8; x++)
00277             if(x==y)
00278                 d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2;
00279             else if(x>y)
00280                 d[y*stride+x] = LOWPASS(top,x-y);
00281             else
00282                 d[y*stride+x] = LOWPASS(left,y-x);
00283 }
00284 
00285 static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00286     int x,y;
00287     for(y=0; y<8; y++)
00288         for(x=0; x<8; x++)
00289             d[y*stride+x] = LOWPASS(left,y+1);
00290 }
00291 
00292 static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
00293     int x,y;
00294     for(y=0; y<8; y++)
00295         for(x=0; x<8; x++)
00296             d[y*stride+x] = LOWPASS(top,x+1);
00297 }
00298 
00299 #undef LOWPASS
00300 
00301 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv) {
00302     /* save pred modes before they get modified */
00303     h->pred_mode_Y[3] =  h->pred_mode_Y[5];
00304     h->pred_mode_Y[6] =  h->pred_mode_Y[8];
00305     h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];
00306     h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];
00307 
00308     /* modify pred modes according to availability of neighbour samples */
00309     if(!(h->flags & A_AVAIL)) {
00310         modify_pred(ff_left_modifier_l, &h->pred_mode_Y[4] );
00311         modify_pred(ff_left_modifier_l, &h->pred_mode_Y[7] );
00312         modify_pred(ff_left_modifier_c, pred_mode_uv );
00313     }
00314     if(!(h->flags & B_AVAIL)) {
00315         modify_pred(ff_top_modifier_l, &h->pred_mode_Y[4] );
00316         modify_pred(ff_top_modifier_l, &h->pred_mode_Y[5] );
00317         modify_pred(ff_top_modifier_c, pred_mode_uv );
00318     }
00319 }
00320 
00321 /*****************************************************************************
00322  *
00323  * motion compensation
00324  *
00325  ****************************************************************************/
00326 
00327 static inline void mc_dir_part(AVSContext *h,Picture *pic,int square,
00328                         int chroma_height,int delta,int list,uint8_t *dest_y,
00329                         uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,
00330                         int src_y_offset,qpel_mc_func *qpix_op,
00331                         h264_chroma_mc_func chroma_op,cavs_vector *mv){
00332     MpegEncContext * const s = &h->s;
00333     const int mx= mv->x + src_x_offset*8;
00334     const int my= mv->y + src_y_offset*8;
00335     const int luma_xy= (mx&3) + ((my&3)<<2);
00336     uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride;
00337     uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride;
00338     uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride;
00339     int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;
00340     int extra_height= extra_width;
00341     int emu=0;
00342     const int full_mx= mx>>2;
00343     const int full_my= my>>2;
00344     const int pic_width  = 16*h->mb_width;
00345     const int pic_height = 16*h->mb_height;
00346 
00347     if(!pic->data[0])
00348         return;
00349     if(mx&7) extra_width -= 3;
00350     if(my&7) extra_height -= 3;
00351 
00352     if(   full_mx < 0-extra_width
00353           || full_my < 0-extra_height
00354           || full_mx + 16/*FIXME*/ > pic_width + extra_width
00355           || full_my + 16/*FIXME*/ > pic_height + extra_height){
00356         ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,
00357                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
00358         src_y= s->edge_emu_buffer + 2 + 2*h->l_stride;
00359         emu=1;
00360     }
00361 
00362     qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?
00363     if(!square){
00364         qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);
00365     }
00366 
00367     if(emu){
00368         ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,
00369                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
00370         src_cb= s->edge_emu_buffer;
00371     }
00372     chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);
00373 
00374     if(emu){
00375         ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,
00376                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
00377         src_cr= s->edge_emu_buffer;
00378     }
00379     chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);
00380 }
00381 
00382 static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,
00383                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,
00384                         int x_offset, int y_offset,qpel_mc_func *qpix_put,
00385                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,
00386                         h264_chroma_mc_func chroma_avg, cavs_vector *mv){
00387     qpel_mc_func *qpix_op=  qpix_put;
00388     h264_chroma_mc_func chroma_op= chroma_put;
00389 
00390     dest_y  += 2*x_offset + 2*y_offset*h->l_stride;
00391     dest_cb +=   x_offset +   y_offset*h->c_stride;
00392     dest_cr +=   x_offset +   y_offset*h->c_stride;
00393     x_offset += 8*h->mbx;
00394     y_offset += 8*h->mby;
00395 
00396     if(mv->ref >= 0){
00397         Picture *ref= &h->DPB[mv->ref];
00398         mc_dir_part(h, ref, square, chroma_height, delta, 0,
00399                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
00400                     qpix_op, chroma_op, mv);
00401 
00402         qpix_op=  qpix_avg;
00403         chroma_op= chroma_avg;
00404     }
00405 
00406     if((mv+MV_BWD_OFFS)->ref >= 0){
00407         Picture *ref= &h->DPB[0];
00408         mc_dir_part(h, ref, square, chroma_height, delta, 1,
00409                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
00410                     qpix_op, chroma_op, mv+MV_BWD_OFFS);
00411     }
00412 }
00413 
00414 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type) {
00415     if(ff_cavs_partition_flags[mb_type] == 0){ // 16x16
00416         mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,
00417                 h->s.dsp.put_cavs_qpel_pixels_tab[0],
00418                 h->s.dsp.put_h264_chroma_pixels_tab[0],
00419                 h->s.dsp.avg_cavs_qpel_pixels_tab[0],
00420                 h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);
00421     }else{
00422         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,
00423                 h->s.dsp.put_cavs_qpel_pixels_tab[1],
00424                 h->s.dsp.put_h264_chroma_pixels_tab[1],
00425                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
00426                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);
00427         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,
00428                 h->s.dsp.put_cavs_qpel_pixels_tab[1],
00429                 h->s.dsp.put_h264_chroma_pixels_tab[1],
00430                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
00431                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);
00432         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,
00433                 h->s.dsp.put_cavs_qpel_pixels_tab[1],
00434                 h->s.dsp.put_h264_chroma_pixels_tab[1],
00435                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
00436                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);
00437         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,
00438                 h->s.dsp.put_cavs_qpel_pixels_tab[1],
00439                 h->s.dsp.put_h264_chroma_pixels_tab[1],
00440                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
00441                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);
00442     }
00443 }
00444 
00445 /*****************************************************************************
00446  *
00447  * motion vector prediction
00448  *
00449  ****************************************************************************/
00450 
00451 static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, cavs_vector *src, int distp) {
00452     int den = h->scale_den[src->ref];
00453 
00454     *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;
00455     *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;
00456 }
00457 
00458 static inline void mv_pred_median(AVSContext *h, cavs_vector *mvP,
00459                         cavs_vector *mvA, cavs_vector *mvB, cavs_vector *mvC) {
00460     int ax, ay, bx, by, cx, cy;
00461     int len_ab, len_bc, len_ca, len_mid;
00462 
00463     /* scale candidates according to their temporal span */
00464     scale_mv(h, &ax, &ay, mvA, mvP->dist);
00465     scale_mv(h, &bx, &by, mvB, mvP->dist);
00466     scale_mv(h, &cx, &cy, mvC, mvP->dist);
00467     /* find the geometrical median of the three candidates */
00468     len_ab = abs(ax - bx) + abs(ay - by);
00469     len_bc = abs(bx - cx) + abs(by - cy);
00470     len_ca = abs(cx - ax) + abs(cy - ay);
00471     len_mid = mid_pred(len_ab, len_bc, len_ca);
00472     if(len_mid == len_ab) {
00473         mvP->x = cx;
00474         mvP->y = cy;
00475     } else if(len_mid == len_bc) {
00476         mvP->x = ax;
00477         mvP->y = ay;
00478     } else {
00479         mvP->x = bx;
00480         mvP->y = by;
00481     }
00482 }
00483 
00484 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
00485                 enum cavs_mv_pred mode, enum cavs_block size, int ref) {
00486     cavs_vector *mvP = &h->mv[nP];
00487     cavs_vector *mvA = &h->mv[nP-1];
00488     cavs_vector *mvB = &h->mv[nP-4];
00489     cavs_vector *mvC = &h->mv[nC];
00490     const cavs_vector *mvP2 = NULL;
00491 
00492     mvP->ref = ref;
00493     mvP->dist = h->dist[mvP->ref];
00494     if(mvC->ref == NOT_AVAIL)
00495         mvC = &h->mv[nP-5]; // set to top-left (mvD)
00496     if((mode == MV_PRED_PSKIP) &&
00497        ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||
00498            ((mvA->x | mvA->y | mvA->ref) == 0)  ||
00499            ((mvB->x | mvB->y | mvB->ref) == 0) )) {
00500         mvP2 = &ff_cavs_un_mv;
00501     /* if there is only one suitable candidate, take it */
00502     } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {
00503         mvP2= mvA;
00504     } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {
00505         mvP2= mvB;
00506     } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {
00507         mvP2= mvC;
00508     } else if(mode == MV_PRED_LEFT     && mvA->ref == ref){
00509         mvP2= mvA;
00510     } else if(mode == MV_PRED_TOP      && mvB->ref == ref){
00511         mvP2= mvB;
00512     } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){
00513         mvP2= mvC;
00514     }
00515     if(mvP2){
00516         mvP->x = mvP2->x;
00517         mvP->y = mvP2->y;
00518     }else
00519         mv_pred_median(h, mvP, mvA, mvB, mvC);
00520 
00521     if(mode < MV_PRED_PSKIP) {
00522         mvP->x += get_se_golomb(&h->s.gb);
00523         mvP->y += get_se_golomb(&h->s.gb);
00524     }
00525     set_mvs(mvP,size);
00526 }
00527 
00528 /*****************************************************************************
00529  *
00530  * macroblock level
00531  *
00532  ****************************************************************************/
00533 
00537 void ff_cavs_init_mb(AVSContext *h) {
00538     int i;
00539 
00540     /* copy predictors from top line (MB B and C) into cache */
00541     for(i=0;i<3;i++) {
00542         h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
00543         h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
00544     }
00545     h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
00546     h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
00547     /* clear top predictors if MB B is not available */
00548     if(!(h->flags & B_AVAIL)) {
00549         h->mv[MV_FWD_B2] = ff_cavs_un_mv;
00550         h->mv[MV_FWD_B3] = ff_cavs_un_mv;
00551         h->mv[MV_BWD_B2] = ff_cavs_un_mv;
00552         h->mv[MV_BWD_B3] = ff_cavs_un_mv;
00553         h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
00554         h->flags &= ~(C_AVAIL|D_AVAIL);
00555     } else if(h->mbx) {
00556         h->flags |= D_AVAIL;
00557     }
00558     if(h->mbx == h->mb_width-1) //MB C not available
00559         h->flags &= ~C_AVAIL;
00560     /* clear top-right predictors if MB C is not available */
00561     if(!(h->flags & C_AVAIL)) {
00562         h->mv[MV_FWD_C2] = ff_cavs_un_mv;
00563         h->mv[MV_BWD_C2] = ff_cavs_un_mv;
00564     }
00565     /* clear top-left predictors if MB D is not available */
00566     if(!(h->flags & D_AVAIL)) {
00567         h->mv[MV_FWD_D3] = ff_cavs_un_mv;
00568         h->mv[MV_BWD_D3] = ff_cavs_un_mv;
00569     }
00570 }
00571 
00577 int ff_cavs_next_mb(AVSContext *h) {
00578     int i;
00579 
00580     h->flags |= A_AVAIL;
00581     h->cy += 16;
00582     h->cu += 8;
00583     h->cv += 8;
00584     /* copy mvs as predictors to the left */
00585     for(i=0;i<=20;i+=4)
00586         h->mv[i] = h->mv[i+2];
00587     /* copy bottom mvs from cache to top line */
00588     h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
00589     h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
00590     h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
00591     h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
00592     /* next MB address */
00593     h->mbidx++;
00594     h->mbx++;
00595     if(h->mbx == h->mb_width) { //new mb line
00596         h->flags = B_AVAIL|C_AVAIL;
00597         /* clear left pred_modes */
00598         h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
00599         /* clear left mv predictors */
00600         for(i=0;i<=20;i+=4)
00601             h->mv[i] = ff_cavs_un_mv;
00602         h->mbx = 0;
00603         h->mby++;
00604         /* re-calculate sample pointers */
00605         h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
00606         h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
00607         h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
00608         if(h->mby == h->mb_height) { //frame end
00609             return 0;
00610         }
00611     }
00612     return 1;
00613 }
00614 
00615 /*****************************************************************************
00616  *
00617  * frame level
00618  *
00619  ****************************************************************************/
00620 
00621 void ff_cavs_init_pic(AVSContext *h) {
00622     int i;
00623 
00624     /* clear some predictors */
00625     for(i=0;i<=20;i+=4)
00626         h->mv[i] = ff_cavs_un_mv;
00627     h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
00628     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
00629     h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
00630     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
00631     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
00632     h->cy = h->picture.data[0];
00633     h->cu = h->picture.data[1];
00634     h->cv = h->picture.data[2];
00635     h->l_stride = h->picture.linesize[0];
00636     h->c_stride = h->picture.linesize[1];
00637     h->luma_scan[2] = 8*h->l_stride;
00638     h->luma_scan[3] = 8*h->l_stride+8;
00639     h->mbx = h->mby = h->mbidx = 0;
00640     h->flags = 0;
00641 }
00642 
00643 /*****************************************************************************
00644  *
00645  * headers and interface
00646  *
00647  ****************************************************************************/
00648 
00654 void ff_cavs_init_top_lines(AVSContext *h) {
00655     /* alloc top line of predictors */
00656     h->top_qp       = av_malloc( h->mb_width);
00657     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(cavs_vector));
00658     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(cavs_vector));
00659     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));
00660     h->top_border_y = av_malloc((h->mb_width+1)*16);
00661     h->top_border_u = av_malloc((h->mb_width)*10);
00662     h->top_border_v = av_malloc((h->mb_width)*10);
00663 
00664     /* alloc space for co-located MVs and types */
00665     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(cavs_vector));
00666     h->col_type_base = av_malloc(h->mb_width*h->mb_height);
00667     h->block        = av_mallocz(64*sizeof(DCTELEM));
00668 }
00669 
00670 av_cold int ff_cavs_init(AVCodecContext *avctx) {
00671     AVSContext *h = avctx->priv_data;
00672     MpegEncContext * const s = &h->s;
00673 
00674     MPV_decode_defaults(s);
00675     s->avctx = avctx;
00676 
00677     avctx->pix_fmt= PIX_FMT_YUV420P;
00678 
00679     h->luma_scan[0] = 0;
00680     h->luma_scan[1] = 8;
00681     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;
00682     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;
00683     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;
00684     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;
00685     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;
00686     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;
00687     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;
00688     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;
00689     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;
00690     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;
00691     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;
00692     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;
00693     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;
00694     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;
00695     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;
00696     h->mv[ 7] = ff_cavs_un_mv;
00697     h->mv[19] = ff_cavs_un_mv;
00698     return 0;
00699 }
00700 
00701 av_cold int ff_cavs_end(AVCodecContext *avctx) {
00702     AVSContext *h = avctx->priv_data;
00703 
00704     av_free(h->top_qp);
00705     av_free(h->top_mv[0]);
00706     av_free(h->top_mv[1]);
00707     av_free(h->top_pred_Y);
00708     av_free(h->top_border_y);
00709     av_free(h->top_border_u);
00710     av_free(h->top_border_v);
00711     av_free(h->col_mv);
00712     av_free(h->col_type_base);
00713     av_free(h->block);
00714     return 0;
00715 }

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