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libavcodec/vp56.c

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00001 /*
00002  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
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 
00026 #include "avcodec.h"
00027 #include "bytestream.h"
00028 
00029 #include "vp56.h"
00030 #include "vp56data.h"
00031 
00032 
00033 void ff_vp56_init_dequant(VP56Context *s, int quantizer)
00034 {
00035     s->quantizer = quantizer;
00036     s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
00037     s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
00038     memset(s->qscale_table, quantizer, s->mb_width);
00039 }
00040 
00041 static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
00042                                        VP56Frame ref_frame)
00043 {
00044     int nb_pred = 0;
00045     VP56mv vect[2] = {{0,0}, {0,0}};
00046     int pos, offset;
00047     VP56mv mvp;
00048 
00049     for (pos=0; pos<12; pos++) {
00050         mvp.x = col + vp56_candidate_predictor_pos[pos][0];
00051         mvp.y = row + vp56_candidate_predictor_pos[pos][1];
00052         if (mvp.x < 0 || mvp.x >= s->mb_width ||
00053             mvp.y < 0 || mvp.y >= s->mb_height)
00054             continue;
00055         offset = mvp.x + s->mb_width*mvp.y;
00056 
00057         if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
00058             continue;
00059         if ((s->macroblocks[offset].mv.x == vect[0].x &&
00060              s->macroblocks[offset].mv.y == vect[0].y) ||
00061             (s->macroblocks[offset].mv.x == 0 &&
00062              s->macroblocks[offset].mv.y == 0))
00063             continue;
00064 
00065         vect[nb_pred++] = s->macroblocks[offset].mv;
00066         if (nb_pred > 1) {
00067             nb_pred = -1;
00068             break;
00069         }
00070         s->vector_candidate_pos = pos;
00071     }
00072 
00073     s->vector_candidate[0] = vect[0];
00074     s->vector_candidate[1] = vect[1];
00075 
00076     return nb_pred+1;
00077 }
00078 
00079 static void vp56_parse_mb_type_models(VP56Context *s)
00080 {
00081     VP56RangeCoder *c = &s->c;
00082     VP56Model *model = s->modelp;
00083     int i, ctx, type;
00084 
00085     for (ctx=0; ctx<3; ctx++) {
00086         if (vp56_rac_get_prob(c, 174)) {
00087             int idx = vp56_rac_gets(c, 4);
00088             memcpy(model->mb_types_stats[ctx],
00089                    vp56_pre_def_mb_type_stats[idx][ctx],
00090                    sizeof(model->mb_types_stats[ctx]));
00091         }
00092         if (vp56_rac_get_prob(c, 254)) {
00093             for (type=0; type<10; type++) {
00094                 for(i=0; i<2; i++) {
00095                     if (vp56_rac_get_prob(c, 205)) {
00096                         int delta, sign = vp56_rac_get(c);
00097 
00098                         delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
00099                                                   vp56_mb_type_model_model);
00100                         if (!delta)
00101                             delta = 4 * vp56_rac_gets(c, 7);
00102                         model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
00103                     }
00104                 }
00105             }
00106         }
00107     }
00108 
00109     /* compute MB type probability tables based on previous MB type */
00110     for (ctx=0; ctx<3; ctx++) {
00111         int p[10];
00112 
00113         for (type=0; type<10; type++)
00114             p[type] = 100 * model->mb_types_stats[ctx][type][1];
00115 
00116         for (type=0; type<10; type++) {
00117             int p02, p34, p0234, p17, p56, p89, p5689, p156789;
00118 
00119             /* conservative MB type probability */
00120             model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
00121 
00122             p[type] = 0;    /* same MB type => weight is null */
00123 
00124             /* binary tree parsing probabilities */
00125             p02 = p[0] + p[2];
00126             p34 = p[3] + p[4];
00127             p0234 = p02 + p34;
00128             p17 = p[1] + p[7];
00129             p56 = p[5] + p[6];
00130             p89 = p[8] + p[9];
00131             p5689 = p56 + p89;
00132             p156789 = p17 + p5689;
00133 
00134             model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
00135             model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
00136             model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
00137             model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
00138             model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
00139             model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
00140             model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
00141             model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
00142             model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
00143 
00144             /* restore initial value */
00145             p[type] = 100 * model->mb_types_stats[ctx][type][1];
00146         }
00147     }
00148 }
00149 
00150 static VP56mb vp56_parse_mb_type(VP56Context *s,
00151                                  VP56mb prev_type, int ctx)
00152 {
00153     uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
00154     VP56RangeCoder *c = &s->c;
00155 
00156     if (vp56_rac_get_prob(c, mb_type_model[0]))
00157         return prev_type;
00158     else
00159         return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
00160 }
00161 
00162 static void vp56_decode_4mv(VP56Context *s, int row, int col)
00163 {
00164     VP56mv mv = {0,0};
00165     int type[4];
00166     int b;
00167 
00168     /* parse each block type */
00169     for (b=0; b<4; b++) {
00170         type[b] = vp56_rac_gets(&s->c, 2);
00171         if (type[b])
00172             type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
00173     }
00174 
00175     /* get vectors */
00176     for (b=0; b<4; b++) {
00177         switch (type[b]) {
00178             case VP56_MB_INTER_NOVEC_PF:
00179                 s->mv[b] = (VP56mv) {0,0};
00180                 break;
00181             case VP56_MB_INTER_DELTA_PF:
00182                 s->parse_vector_adjustment(s, &s->mv[b]);
00183                 break;
00184             case VP56_MB_INTER_V1_PF:
00185                 s->mv[b] = s->vector_candidate[0];
00186                 break;
00187             case VP56_MB_INTER_V2_PF:
00188                 s->mv[b] = s->vector_candidate[1];
00189                 break;
00190         }
00191         mv.x += s->mv[b].x;
00192         mv.y += s->mv[b].y;
00193     }
00194 
00195     /* this is the one selected for the whole MB for prediction */
00196     s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
00197 
00198     /* chroma vectors are average luma vectors */
00199     if (s->avctx->codec->id == CODEC_ID_VP5) {
00200         s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
00201         s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
00202     } else {
00203         s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
00204     }
00205 }
00206 
00207 static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
00208 {
00209     VP56mv *mv, vect = {0,0};
00210     int ctx, b;
00211 
00212     ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
00213     s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
00214     s->macroblocks[row * s->mb_width + col].type = s->mb_type;
00215 
00216     switch (s->mb_type) {
00217         case VP56_MB_INTER_V1_PF:
00218             mv = &s->vector_candidate[0];
00219             break;
00220 
00221         case VP56_MB_INTER_V2_PF:
00222             mv = &s->vector_candidate[1];
00223             break;
00224 
00225         case VP56_MB_INTER_V1_GF:
00226             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00227             mv = &s->vector_candidate[0];
00228             break;
00229 
00230         case VP56_MB_INTER_V2_GF:
00231             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00232             mv = &s->vector_candidate[1];
00233             break;
00234 
00235         case VP56_MB_INTER_DELTA_PF:
00236             s->parse_vector_adjustment(s, &vect);
00237             mv = &vect;
00238             break;
00239 
00240         case VP56_MB_INTER_DELTA_GF:
00241             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00242             s->parse_vector_adjustment(s, &vect);
00243             mv = &vect;
00244             break;
00245 
00246         case VP56_MB_INTER_4V:
00247             vp56_decode_4mv(s, row, col);
00248             return s->mb_type;
00249 
00250         default:
00251             mv = &vect;
00252             break;
00253     }
00254 
00255     s->macroblocks[row*s->mb_width + col].mv = *mv;
00256 
00257     /* same vector for all blocks */
00258     for (b=0; b<6; b++)
00259         s->mv[b] = *mv;
00260 
00261     return s->mb_type;
00262 }
00263 
00264 static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
00265 {
00266     int idx = s->scantable.permutated[0];
00267     int b;
00268 
00269     for (b=0; b<6; b++) {
00270         VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
00271         VP56RefDc *lb = &s->left_block[vp56_b6to4[b]];
00272         int count = 0;
00273         int dc = 0;
00274         int i;
00275 
00276         if (ref_frame == lb->ref_frame) {
00277             dc += lb->dc_coeff;
00278             count++;
00279         }
00280         if (ref_frame == ab->ref_frame) {
00281             dc += ab->dc_coeff;
00282             count++;
00283         }
00284         if (s->avctx->codec->id == CODEC_ID_VP5)
00285             for (i=0; i<2; i++)
00286                 if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
00287                     dc += ab[-1+2*i].dc_coeff;
00288                     count++;
00289                 }
00290         if (count == 0)
00291             dc = s->prev_dc[vp56_b2p[b]][ref_frame];
00292         else if (count == 2)
00293             dc /= 2;
00294 
00295         s->block_coeff[b][idx] += dc;
00296         s->prev_dc[vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
00297         ab->dc_coeff = s->block_coeff[b][idx];
00298         ab->ref_frame = ref_frame;
00299         lb->dc_coeff = s->block_coeff[b][idx];
00300         lb->ref_frame = ref_frame;
00301         s->block_coeff[b][idx] *= s->dequant_dc;
00302     }
00303 }
00304 
00305 static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
00306                                 int stride, int dx, int dy)
00307 {
00308     int t = vp56_filter_threshold[s->quantizer];
00309     if (dx)  s->vp56dsp.edge_filter_hor(yuv +         10-dx , stride, t);
00310     if (dy)  s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
00311 }
00312 
00313 static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
00314                     int stride, int x, int y)
00315 {
00316     uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
00317     uint8_t *src_block;
00318     int src_offset;
00319     int overlap_offset = 0;
00320     int mask = s->vp56_coord_div[b] - 1;
00321     int deblock_filtering = s->deblock_filtering;
00322     int dx;
00323     int dy;
00324 
00325     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
00326         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
00327          && !s->framep[VP56_FRAME_CURRENT]->key_frame))
00328         deblock_filtering = 0;
00329 
00330     dx = s->mv[b].x / s->vp56_coord_div[b];
00331     dy = s->mv[b].y / s->vp56_coord_div[b];
00332 
00333     if (b >= 4) {
00334         x /= 2;
00335         y /= 2;
00336     }
00337     x += dx - 2;
00338     y += dy - 2;
00339 
00340     if (x<0 || x+12>=s->plane_width[plane] ||
00341         y<0 || y+12>=s->plane_height[plane]) {
00342         s->dsp.emulated_edge_mc(s->edge_emu_buffer,
00343                             src + s->block_offset[b] + (dy-2)*stride + (dx-2),
00344                             stride, 12, 12, x, y,
00345                             s->plane_width[plane],
00346                             s->plane_height[plane]);
00347         src_block = s->edge_emu_buffer;
00348         src_offset = 2 + 2*stride;
00349     } else if (deblock_filtering) {
00350         /* only need a 12x12 block, but there is no such dsp function, */
00351         /* so copy a 16x12 block */
00352         s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
00353                                     src + s->block_offset[b] + (dy-2)*stride + (dx-2),
00354                                     stride, 12);
00355         src_block = s->edge_emu_buffer;
00356         src_offset = 2 + 2*stride;
00357     } else {
00358         src_block = src;
00359         src_offset = s->block_offset[b] + dy*stride + dx;
00360     }
00361 
00362     if (deblock_filtering)
00363         vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
00364 
00365     if (s->mv[b].x & mask)
00366         overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
00367     if (s->mv[b].y & mask)
00368         overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
00369 
00370     if (overlap_offset) {
00371         if (s->filter)
00372             s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
00373                       stride, s->mv[b], mask, s->filter_selection, b<4);
00374         else
00375             s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
00376                                            src_block+src_offset+overlap_offset,
00377                                            stride, 8);
00378     } else {
00379         s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
00380     }
00381 }
00382 
00383 static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
00384 {
00385     AVFrame *frame_current, *frame_ref;
00386     VP56mb mb_type;
00387     VP56Frame ref_frame;
00388     int b, ab, b_max, plane, off;
00389 
00390     if (s->framep[VP56_FRAME_CURRENT]->key_frame)
00391         mb_type = VP56_MB_INTRA;
00392     else
00393         mb_type = vp56_decode_mv(s, row, col);
00394     ref_frame = vp56_reference_frame[mb_type];
00395 
00396     s->dsp.clear_blocks(*s->block_coeff);
00397 
00398     s->parse_coeff(s);
00399 
00400     vp56_add_predictors_dc(s, ref_frame);
00401 
00402     frame_current = s->framep[VP56_FRAME_CURRENT];
00403     frame_ref = s->framep[ref_frame];
00404     if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
00405         return;
00406 
00407     ab = 6*is_alpha;
00408     b_max = 6 - 2*is_alpha;
00409 
00410     switch (mb_type) {
00411         case VP56_MB_INTRA:
00412             for (b=0; b<b_max; b++) {
00413                 plane = vp56_b2p[b+ab];
00414                 s->dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
00415                                 s->stride[plane], s->block_coeff[b]);
00416             }
00417             break;
00418 
00419         case VP56_MB_INTER_NOVEC_PF:
00420         case VP56_MB_INTER_NOVEC_GF:
00421             for (b=0; b<b_max; b++) {
00422                 plane = vp56_b2p[b+ab];
00423                 off = s->block_offset[b];
00424                 s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
00425                                             frame_ref->data[plane] + off,
00426                                             s->stride[plane], 8);
00427                 s->dsp.idct_add(frame_current->data[plane] + off,
00428                                 s->stride[plane], s->block_coeff[b]);
00429             }
00430             break;
00431 
00432         case VP56_MB_INTER_DELTA_PF:
00433         case VP56_MB_INTER_V1_PF:
00434         case VP56_MB_INTER_V2_PF:
00435         case VP56_MB_INTER_DELTA_GF:
00436         case VP56_MB_INTER_4V:
00437         case VP56_MB_INTER_V1_GF:
00438         case VP56_MB_INTER_V2_GF:
00439             for (b=0; b<b_max; b++) {
00440                 int x_off = b==1 || b==3 ? 8 : 0;
00441                 int y_off = b==2 || b==3 ? 8 : 0;
00442                 plane = vp56_b2p[b+ab];
00443                 vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
00444                         16*col+x_off, 16*row+y_off);
00445                 s->dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
00446                                 s->stride[plane], s->block_coeff[b]);
00447             }
00448             break;
00449     }
00450 }
00451 
00452 static int vp56_size_changed(AVCodecContext *avctx)
00453 {
00454     VP56Context *s = avctx->priv_data;
00455     int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
00456     int i;
00457 
00458     s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
00459     s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
00460     s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
00461     s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
00462 
00463     for (i=0; i<4; i++)
00464         s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
00465 
00466     s->mb_width  = (avctx->coded_width +15) / 16;
00467     s->mb_height = (avctx->coded_height+15) / 16;
00468 
00469     if (s->mb_width > 1000 || s->mb_height > 1000) {
00470         avcodec_set_dimensions(avctx, 0, 0);
00471         av_log(avctx, AV_LOG_ERROR, "picture too big\n");
00472         return -1;
00473     }
00474 
00475     s->qscale_table = av_realloc(s->qscale_table, s->mb_width);
00476     s->above_blocks = av_realloc(s->above_blocks,
00477                                  (4*s->mb_width+6) * sizeof(*s->above_blocks));
00478     s->macroblocks = av_realloc(s->macroblocks,
00479                                 s->mb_width*s->mb_height*sizeof(*s->macroblocks));
00480     av_free(s->edge_emu_buffer_alloc);
00481     s->edge_emu_buffer_alloc = av_malloc(16*stride);
00482     s->edge_emu_buffer = s->edge_emu_buffer_alloc;
00483     if (s->flip < 0)
00484         s->edge_emu_buffer += 15 * stride;
00485 
00486     return 0;
00487 }
00488 
00489 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00490                          AVPacket *avpkt)
00491 {
00492     const uint8_t *buf = avpkt->data;
00493     VP56Context *s = avctx->priv_data;
00494     AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
00495     int remaining_buf_size = avpkt->size;
00496     int is_alpha, av_uninit(alpha_offset);
00497 
00498     if (s->has_alpha) {
00499         if (remaining_buf_size < 3)
00500             return -1;
00501         alpha_offset = bytestream_get_be24(&buf);
00502         remaining_buf_size -= 3;
00503         if (remaining_buf_size < alpha_offset)
00504             return -1;
00505     }
00506 
00507     for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
00508         int mb_row, mb_col, mb_row_flip, mb_offset = 0;
00509         int block, y, uv, stride_y, stride_uv;
00510         int golden_frame = 0;
00511         int res;
00512 
00513         s->modelp = &s->models[is_alpha];
00514 
00515         res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
00516         if (res < 0) {
00517             int i;
00518             for (i = 0; i < 4; i++) {
00519                 if (s->frames[i].data[0])
00520                     avctx->release_buffer(avctx, &s->frames[i]);
00521             }
00522             return res;
00523         }
00524 
00525         if (res == VP56_SIZE_CHANGE) {
00526             int i;
00527             for (i = 0; i < 4; i++) {
00528                 if (s->frames[i].data[0])
00529                     avctx->release_buffer(avctx, &s->frames[i]);
00530             }
00531             if (is_alpha) {
00532                 avcodec_set_dimensions(avctx, 0, 0);
00533                 return -1;
00534             }
00535         }
00536 
00537         if (!is_alpha) {
00538             p->reference = 1;
00539             if (avctx->get_buffer(avctx, p) < 0) {
00540                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00541                 return -1;
00542             }
00543 
00544             if (res == VP56_SIZE_CHANGE)
00545                 if (vp56_size_changed(avctx)) {
00546                     avctx->release_buffer(avctx, p);
00547                     return -1;
00548                 }
00549         }
00550 
00551         if (p->key_frame) {
00552             p->pict_type = AV_PICTURE_TYPE_I;
00553             s->default_models_init(s);
00554             for (block=0; block<s->mb_height*s->mb_width; block++)
00555                 s->macroblocks[block].type = VP56_MB_INTRA;
00556         } else {
00557             p->pict_type = AV_PICTURE_TYPE_P;
00558             vp56_parse_mb_type_models(s);
00559             s->parse_vector_models(s);
00560             s->mb_type = VP56_MB_INTER_NOVEC_PF;
00561         }
00562 
00563         if (s->parse_coeff_models(s))
00564             goto next;
00565 
00566         memset(s->prev_dc, 0, sizeof(s->prev_dc));
00567         s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
00568         s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
00569 
00570         for (block=0; block < 4*s->mb_width+6; block++) {
00571             s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
00572             s->above_blocks[block].dc_coeff = 0;
00573             s->above_blocks[block].not_null_dc = 0;
00574         }
00575         s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
00576         s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
00577 
00578         stride_y  = p->linesize[0];
00579         stride_uv = p->linesize[1];
00580 
00581         if (s->flip < 0)
00582             mb_offset = 7;
00583 
00584         /* main macroblocks loop */
00585         for (mb_row=0; mb_row<s->mb_height; mb_row++) {
00586             if (s->flip < 0)
00587                 mb_row_flip = s->mb_height - mb_row - 1;
00588             else
00589                 mb_row_flip = mb_row;
00590 
00591             for (block=0; block<4; block++) {
00592                 s->left_block[block].ref_frame = VP56_FRAME_NONE;
00593                 s->left_block[block].dc_coeff = 0;
00594                 s->left_block[block].not_null_dc = 0;
00595             }
00596             memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
00597             memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
00598 
00599             s->above_block_idx[0] = 1;
00600             s->above_block_idx[1] = 2;
00601             s->above_block_idx[2] = 1;
00602             s->above_block_idx[3] = 2;
00603             s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
00604             s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
00605 
00606             s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
00607             s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
00608             s->block_offset[1] = s->block_offset[0] + 8;
00609             s->block_offset[3] = s->block_offset[2] + 8;
00610             s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
00611             s->block_offset[5] = s->block_offset[4];
00612 
00613             for (mb_col=0; mb_col<s->mb_width; mb_col++) {
00614                 vp56_decode_mb(s, mb_row, mb_col, is_alpha);
00615 
00616                 for (y=0; y<4; y++) {
00617                     s->above_block_idx[y] += 2;
00618                     s->block_offset[y] += 16;
00619                 }
00620 
00621                 for (uv=4; uv<6; uv++) {
00622                     s->above_block_idx[uv] += 1;
00623                     s->block_offset[uv] += 8;
00624                 }
00625             }
00626         }
00627 
00628     next:
00629         if (p->key_frame || golden_frame) {
00630             if (s->framep[VP56_FRAME_GOLDEN]->data[0] &&
00631                 s->framep[VP56_FRAME_GOLDEN] != s->framep[VP56_FRAME_GOLDEN2])
00632                 avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
00633             s->framep[VP56_FRAME_GOLDEN] = p;
00634         }
00635 
00636         if (s->has_alpha) {
00637             FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN],
00638                               s->framep[VP56_FRAME_GOLDEN2]);
00639             buf += alpha_offset;
00640             remaining_buf_size -= alpha_offset;
00641         }
00642     }
00643 
00644     if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN] ||
00645         s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN2]) {
00646         if (s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN] &&
00647             s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN2])
00648             FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
00649                               s->framep[VP56_FRAME_UNUSED]);
00650         else
00651             FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
00652                               s->framep[VP56_FRAME_UNUSED2]);
00653     } else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
00654         avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
00655     FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
00656                       s->framep[VP56_FRAME_PREVIOUS]);
00657 
00658     p->qstride = 0;
00659     p->qscale_table = s->qscale_table;
00660     p->qscale_type = FF_QSCALE_TYPE_VP56;
00661     *(AVFrame*)data = *p;
00662     *data_size = sizeof(AVFrame);
00663 
00664     return avpkt->size;
00665 }
00666 
00667 av_cold void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
00668 {
00669     VP56Context *s = avctx->priv_data;
00670     int i;
00671 
00672     s->avctx = avctx;
00673     avctx->pix_fmt = has_alpha ? PIX_FMT_YUVA420P : PIX_FMT_YUV420P;
00674 
00675     if (avctx->idct_algo == FF_IDCT_AUTO)
00676         avctx->idct_algo = FF_IDCT_VP3;
00677     dsputil_init(&s->dsp, avctx);
00678     ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
00679     ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
00680 
00681     for (i=0; i<4; i++)
00682         s->framep[i] = &s->frames[i];
00683     s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
00684     s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
00685     s->edge_emu_buffer_alloc = NULL;
00686 
00687     s->above_blocks = NULL;
00688     s->macroblocks = NULL;
00689     s->quantizer = -1;
00690     s->deblock_filtering = 1;
00691 
00692     s->filter = NULL;
00693 
00694     s->has_alpha = has_alpha;
00695     if (flip) {
00696         s->flip = -1;
00697         s->frbi = 2;
00698         s->srbi = 0;
00699     } else {
00700         s->flip = 1;
00701         s->frbi = 0;
00702         s->srbi = 2;
00703     }
00704 }
00705 
00706 av_cold int ff_vp56_free(AVCodecContext *avctx)
00707 {
00708     VP56Context *s = avctx->priv_data;
00709 
00710     av_freep(&s->qscale_table);
00711     av_freep(&s->above_blocks);
00712     av_freep(&s->macroblocks);
00713     av_freep(&s->edge_emu_buffer_alloc);
00714     if (s->framep[VP56_FRAME_GOLDEN]->data[0])
00715         avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
00716     if (s->framep[VP56_FRAME_GOLDEN2]->data[0])
00717         avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN2]);
00718     if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
00719         avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
00720     return 0;
00721 }
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