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libavcodec/vp56.c

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00001 
00024 #include "avcodec.h"
00025 #include "bytestream.h"
00026 
00027 #include "vp56.h"
00028 #include "vp56data.h"
00029 
00030 
00031 void vp56_init_dequant(VP56Context *s, int quantizer)
00032 {
00033     s->quantizer = quantizer;
00034     s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
00035     s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
00036     memset(s->qscale_table, quantizer, s->mb_width);
00037 }
00038 
00039 static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
00040                                        VP56Frame ref_frame)
00041 {
00042     int nb_pred = 0;
00043     VP56mv vect[2] = {{0,0}, {0,0}};
00044     int pos, offset;
00045     VP56mv mvp;
00046 
00047     for (pos=0; pos<12; pos++) {
00048         mvp.x = col + vp56_candidate_predictor_pos[pos][0];
00049         mvp.y = row + vp56_candidate_predictor_pos[pos][1];
00050         if (mvp.x < 0 || mvp.x >= s->mb_width ||
00051             mvp.y < 0 || mvp.y >= s->mb_height)
00052             continue;
00053         offset = mvp.x + s->mb_width*mvp.y;
00054 
00055         if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
00056             continue;
00057         if ((s->macroblocks[offset].mv.x == vect[0].x &&
00058              s->macroblocks[offset].mv.y == vect[0].y) ||
00059             (s->macroblocks[offset].mv.x == 0 &&
00060              s->macroblocks[offset].mv.y == 0))
00061             continue;
00062 
00063         vect[nb_pred++] = s->macroblocks[offset].mv;
00064         if (nb_pred > 1) {
00065             nb_pred = -1;
00066             break;
00067         }
00068         s->vector_candidate_pos = pos;
00069     }
00070 
00071     s->vector_candidate[0] = vect[0];
00072     s->vector_candidate[1] = vect[1];
00073 
00074     return nb_pred+1;
00075 }
00076 
00077 static void vp56_parse_mb_type_models(VP56Context *s)
00078 {
00079     VP56RangeCoder *c = &s->c;
00080     VP56Model *model = s->modelp;
00081     int i, ctx, type;
00082 
00083     for (ctx=0; ctx<3; ctx++) {
00084         if (vp56_rac_get_prob(c, 174)) {
00085             int idx = vp56_rac_gets(c, 4);
00086             memcpy(model->mb_types_stats[ctx],
00087                    vp56_pre_def_mb_type_stats[idx][ctx],
00088                    sizeof(model->mb_types_stats[ctx]));
00089         }
00090         if (vp56_rac_get_prob(c, 254)) {
00091             for (type=0; type<10; type++) {
00092                 for(i=0; i<2; i++) {
00093                     if (vp56_rac_get_prob(c, 205)) {
00094                         int delta, sign = vp56_rac_get(c);
00095 
00096                         delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
00097                                                   vp56_mb_type_model_model);
00098                         if (!delta)
00099                             delta = 4 * vp56_rac_gets(c, 7);
00100                         model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
00101                     }
00102                 }
00103             }
00104         }
00105     }
00106 
00107     /* compute MB type probability tables based on previous MB type */
00108     for (ctx=0; ctx<3; ctx++) {
00109         int p[10];
00110 
00111         for (type=0; type<10; type++)
00112             p[type] = 100 * model->mb_types_stats[ctx][type][1];
00113 
00114         for (type=0; type<10; type++) {
00115             int p02, p34, p0234, p17, p56, p89, p5689, p156789;
00116 
00117             /* conservative MB type probability */
00118             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]);
00119 
00120             p[type] = 0;    /* same MB type => weight is null */
00121 
00122             /* binary tree parsing probabilities */
00123             p02 = p[0] + p[2];
00124             p34 = p[3] + p[4];
00125             p0234 = p02 + p34;
00126             p17 = p[1] + p[7];
00127             p56 = p[5] + p[6];
00128             p89 = p[8] + p[9];
00129             p5689 = p56 + p89;
00130             p156789 = p17 + p5689;
00131 
00132             model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
00133             model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
00134             model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
00135             model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
00136             model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
00137             model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
00138             model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
00139             model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
00140             model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
00141 
00142             /* restore initial value */
00143             p[type] = 100 * model->mb_types_stats[ctx][type][1];
00144         }
00145     }
00146 }
00147 
00148 static VP56mb vp56_parse_mb_type(VP56Context *s,
00149                                  VP56mb prev_type, int ctx)
00150 {
00151     uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
00152     VP56RangeCoder *c = &s->c;
00153 
00154     if (vp56_rac_get_prob(c, mb_type_model[0]))
00155         return prev_type;
00156     else
00157         return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
00158 }
00159 
00160 static void vp56_decode_4mv(VP56Context *s, int row, int col)
00161 {
00162     VP56mv mv = {0,0};
00163     int type[4];
00164     int b;
00165 
00166     /* parse each block type */
00167     for (b=0; b<4; b++) {
00168         type[b] = vp56_rac_gets(&s->c, 2);
00169         if (type[b])
00170             type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
00171     }
00172 
00173     /* get vectors */
00174     for (b=0; b<4; b++) {
00175         switch (type[b]) {
00176             case VP56_MB_INTER_NOVEC_PF:
00177                 s->mv[b] = (VP56mv) {0,0};
00178                 break;
00179             case VP56_MB_INTER_DELTA_PF:
00180                 s->parse_vector_adjustment(s, &s->mv[b]);
00181                 break;
00182             case VP56_MB_INTER_V1_PF:
00183                 s->mv[b] = s->vector_candidate[0];
00184                 break;
00185             case VP56_MB_INTER_V2_PF:
00186                 s->mv[b] = s->vector_candidate[1];
00187                 break;
00188         }
00189         mv.x += s->mv[b].x;
00190         mv.y += s->mv[b].y;
00191     }
00192 
00193     /* this is the one selected for the whole MB for prediction */
00194     s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
00195 
00196     /* chroma vectors are average luma vectors */
00197     if (s->avctx->codec->id == CODEC_ID_VP5) {
00198         s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
00199         s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
00200     } else {
00201         s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
00202     }
00203 }
00204 
00205 static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
00206 {
00207     VP56mv *mv, vect = {0,0};
00208     int ctx, b;
00209 
00210     ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
00211     s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
00212     s->macroblocks[row * s->mb_width + col].type = s->mb_type;
00213 
00214     switch (s->mb_type) {
00215         case VP56_MB_INTER_V1_PF:
00216             mv = &s->vector_candidate[0];
00217             break;
00218 
00219         case VP56_MB_INTER_V2_PF:
00220             mv = &s->vector_candidate[1];
00221             break;
00222 
00223         case VP56_MB_INTER_V1_GF:
00224             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00225             mv = &s->vector_candidate[0];
00226             break;
00227 
00228         case VP56_MB_INTER_V2_GF:
00229             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00230             mv = &s->vector_candidate[1];
00231             break;
00232 
00233         case VP56_MB_INTER_DELTA_PF:
00234             s->parse_vector_adjustment(s, &vect);
00235             mv = &vect;
00236             break;
00237 
00238         case VP56_MB_INTER_DELTA_GF:
00239             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
00240             s->parse_vector_adjustment(s, &vect);
00241             mv = &vect;
00242             break;
00243 
00244         case VP56_MB_INTER_4V:
00245             vp56_decode_4mv(s, row, col);
00246             return s->mb_type;
00247 
00248         default:
00249             mv = &vect;
00250             break;
00251     }
00252 
00253     s->macroblocks[row*s->mb_width + col].mv = *mv;
00254 
00255     /* same vector for all blocks */
00256     for (b=0; b<6; b++)
00257         s->mv[b] = *mv;
00258 
00259     return s->mb_type;
00260 }
00261 
00262 static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
00263 {
00264     int idx = s->scantable.permutated[0];
00265     int b;
00266 
00267     for (b=0; b<6; b++) {
00268         VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
00269         VP56RefDc *lb = &s->left_block[vp56_b6to4[b]];
00270         int count = 0;
00271         int dc = 0;
00272         int i;
00273 
00274         if (ref_frame == lb->ref_frame) {
00275             dc += lb->dc_coeff;
00276             count++;
00277         }
00278         if (ref_frame == ab->ref_frame) {
00279             dc += ab->dc_coeff;
00280             count++;
00281         }
00282         if (s->avctx->codec->id == CODEC_ID_VP5)
00283             for (i=0; i<2; i++)
00284                 if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
00285                     dc += ab[-1+2*i].dc_coeff;
00286                     count++;
00287                 }
00288         if (count == 0)
00289             dc = s->prev_dc[vp56_b2p[b]][ref_frame];
00290         else if (count == 2)
00291             dc /= 2;
00292 
00293         s->block_coeff[b][idx] += dc;
00294         s->prev_dc[vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
00295         ab->dc_coeff = s->block_coeff[b][idx];
00296         ab->ref_frame = ref_frame;
00297         lb->dc_coeff = s->block_coeff[b][idx];
00298         lb->ref_frame = ref_frame;
00299         s->block_coeff[b][idx] *= s->dequant_dc;
00300     }
00301 }
00302 
00303 static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
00304                                 int stride, int dx, int dy)
00305 {
00306     int t = vp56_filter_threshold[s->quantizer];
00307     if (dx)  s->vp56dsp.edge_filter_hor(yuv +         10-dx , stride, t);
00308     if (dy)  s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
00309 }
00310 
00311 static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
00312                     int stride, int x, int y)
00313 {
00314     uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
00315     uint8_t *src_block;
00316     int src_offset;
00317     int overlap_offset = 0;
00318     int mask = s->vp56_coord_div[b] - 1;
00319     int deblock_filtering = s->deblock_filtering;
00320     int dx;
00321     int dy;
00322 
00323     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
00324         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
00325          && !s->framep[VP56_FRAME_CURRENT]->key_frame))
00326         deblock_filtering = 0;
00327 
00328     dx = s->mv[b].x / s->vp56_coord_div[b];
00329     dy = s->mv[b].y / s->vp56_coord_div[b];
00330 
00331     if (b >= 4) {
00332         x /= 2;
00333         y /= 2;
00334     }
00335     x += dx - 2;
00336     y += dy - 2;
00337 
00338     if (x<0 || x+12>=s->plane_width[plane] ||
00339         y<0 || y+12>=s->plane_height[plane]) {
00340         ff_emulated_edge_mc(s->edge_emu_buffer,
00341                             src + s->block_offset[b] + (dy-2)*stride + (dx-2),
00342                             stride, 12, 12, x, y,
00343                             s->plane_width[plane],
00344                             s->plane_height[plane]);
00345         src_block = s->edge_emu_buffer;
00346         src_offset = 2 + 2*stride;
00347     } else if (deblock_filtering) {
00348         /* only need a 12x12 block, but there is no such dsp function, */
00349         /* so copy a 16x12 block */
00350         s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
00351                                     src + s->block_offset[b] + (dy-2)*stride + (dx-2),
00352                                     stride, 12);
00353         src_block = s->edge_emu_buffer;
00354         src_offset = 2 + 2*stride;
00355     } else {
00356         src_block = src;
00357         src_offset = s->block_offset[b] + dy*stride + dx;
00358     }
00359 
00360     if (deblock_filtering)
00361         vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
00362 
00363     if (s->mv[b].x & mask)
00364         overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
00365     if (s->mv[b].y & mask)
00366         overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
00367 
00368     if (overlap_offset) {
00369         if (s->filter)
00370             s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
00371                       stride, s->mv[b], mask, s->filter_selection, b<4);
00372         else
00373             s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
00374                                            src_block+src_offset+overlap_offset,
00375                                            stride, 8);
00376     } else {
00377         s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
00378     }
00379 }
00380 
00381 static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
00382 {
00383     AVFrame *frame_current, *frame_ref;
00384     VP56mb mb_type;
00385     VP56Frame ref_frame;
00386     int b, ab, b_max, plane, off;
00387 
00388     if (s->framep[VP56_FRAME_CURRENT]->key_frame)
00389         mb_type = VP56_MB_INTRA;
00390     else
00391         mb_type = vp56_decode_mv(s, row, col);
00392     ref_frame = vp56_reference_frame[mb_type];
00393 
00394     s->dsp.clear_blocks(*s->block_coeff);
00395 
00396     s->parse_coeff(s);
00397 
00398     vp56_add_predictors_dc(s, ref_frame);
00399 
00400     frame_current = s->framep[VP56_FRAME_CURRENT];
00401     frame_ref = s->framep[ref_frame];
00402 
00403     ab = 6*is_alpha;
00404     b_max = 6 - 2*is_alpha;
00405 
00406     switch (mb_type) {
00407         case VP56_MB_INTRA:
00408             for (b=0; b<b_max; b++) {
00409                 plane = vp56_b2p[b+ab];
00410                 s->dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
00411                                 s->stride[plane], s->block_coeff[b]);
00412             }
00413             break;
00414 
00415         case VP56_MB_INTER_NOVEC_PF:
00416         case VP56_MB_INTER_NOVEC_GF:
00417             for (b=0; b<b_max; b++) {
00418                 plane = vp56_b2p[b+ab];
00419                 off = s->block_offset[b];
00420                 s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
00421                                             frame_ref->data[plane] + off,
00422                                             s->stride[plane], 8);
00423                 s->dsp.idct_add(frame_current->data[plane] + off,
00424                                 s->stride[plane], s->block_coeff[b]);
00425             }
00426             break;
00427 
00428         case VP56_MB_INTER_DELTA_PF:
00429         case VP56_MB_INTER_V1_PF:
00430         case VP56_MB_INTER_V2_PF:
00431         case VP56_MB_INTER_DELTA_GF:
00432         case VP56_MB_INTER_4V:
00433         case VP56_MB_INTER_V1_GF:
00434         case VP56_MB_INTER_V2_GF:
00435             for (b=0; b<b_max; b++) {
00436                 int x_off = b==1 || b==3 ? 8 : 0;
00437                 int y_off = b==2 || b==3 ? 8 : 0;
00438                 plane = vp56_b2p[b+ab];
00439                 vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
00440                         16*col+x_off, 16*row+y_off);
00441                 s->dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
00442                                 s->stride[plane], s->block_coeff[b]);
00443             }
00444             break;
00445     }
00446 }
00447 
00448 static int vp56_size_changed(AVCodecContext *avctx)
00449 {
00450     VP56Context *s = avctx->priv_data;
00451     int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
00452     int i;
00453 
00454     s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
00455     s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
00456     s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
00457     s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
00458 
00459     for (i=0; i<4; i++)
00460         s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
00461 
00462     s->mb_width  = (avctx->coded_width +15) / 16;
00463     s->mb_height = (avctx->coded_height+15) / 16;
00464 
00465     if (s->mb_width > 1000 || s->mb_height > 1000) {
00466         av_log(avctx, AV_LOG_ERROR, "picture too big\n");
00467         return -1;
00468     }
00469 
00470     s->qscale_table = av_realloc(s->qscale_table, s->mb_width);
00471     s->above_blocks = av_realloc(s->above_blocks,
00472                                  (4*s->mb_width+6) * sizeof(*s->above_blocks));
00473     s->macroblocks = av_realloc(s->macroblocks,
00474                                 s->mb_width*s->mb_height*sizeof(*s->macroblocks));
00475     av_free(s->edge_emu_buffer_alloc);
00476     s->edge_emu_buffer_alloc = av_malloc(16*stride);
00477     s->edge_emu_buffer = s->edge_emu_buffer_alloc;
00478     if (s->flip < 0)
00479         s->edge_emu_buffer += 15 * stride;
00480 
00481     return 0;
00482 }
00483 
00484 int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00485                       AVPacket *avpkt)
00486 {
00487     const uint8_t *buf = avpkt->data;
00488     VP56Context *s = avctx->priv_data;
00489     AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
00490     int remaining_buf_size = avpkt->size;
00491     int is_alpha, av_uninit(alpha_offset);
00492 
00493     if (s->has_alpha) {
00494         if (remaining_buf_size < 3)
00495             return -1;
00496         alpha_offset = bytestream_get_be24(&buf);
00497         remaining_buf_size -= 3;
00498         if (remaining_buf_size < alpha_offset)
00499             return -1;
00500     }
00501 
00502     for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
00503         int mb_row, mb_col, mb_row_flip, mb_offset = 0;
00504         int block, y, uv, stride_y, stride_uv;
00505         int golden_frame = 0;
00506         int res;
00507 
00508         s->modelp = &s->models[is_alpha];
00509 
00510         res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
00511         if (!res)
00512             return -1;
00513 
00514         if (!is_alpha) {
00515             p->reference = 1;
00516             if (avctx->get_buffer(avctx, p) < 0) {
00517                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00518                 return -1;
00519             }
00520 
00521             if (res == 2)
00522                 if (vp56_size_changed(avctx)) {
00523                     avctx->release_buffer(avctx, p);
00524                     return -1;
00525                 }
00526         }
00527 
00528         if (p->key_frame) {
00529             p->pict_type = FF_I_TYPE;
00530             s->default_models_init(s);
00531             for (block=0; block<s->mb_height*s->mb_width; block++)
00532                 s->macroblocks[block].type = VP56_MB_INTRA;
00533         } else {
00534             p->pict_type = FF_P_TYPE;
00535             vp56_parse_mb_type_models(s);
00536             s->parse_vector_models(s);
00537             s->mb_type = VP56_MB_INTER_NOVEC_PF;
00538         }
00539 
00540         s->parse_coeff_models(s);
00541 
00542         memset(s->prev_dc, 0, sizeof(s->prev_dc));
00543         s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
00544         s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
00545 
00546         for (block=0; block < 4*s->mb_width+6; block++) {
00547             s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
00548             s->above_blocks[block].dc_coeff = 0;
00549             s->above_blocks[block].not_null_dc = 0;
00550         }
00551         s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
00552         s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
00553 
00554         stride_y  = p->linesize[0];
00555         stride_uv = p->linesize[1];
00556 
00557         if (s->flip < 0)
00558             mb_offset = 7;
00559 
00560         /* main macroblocks loop */
00561         for (mb_row=0; mb_row<s->mb_height; mb_row++) {
00562             if (s->flip < 0)
00563                 mb_row_flip = s->mb_height - mb_row - 1;
00564             else
00565                 mb_row_flip = mb_row;
00566 
00567             for (block=0; block<4; block++) {
00568                 s->left_block[block].ref_frame = VP56_FRAME_NONE;
00569                 s->left_block[block].dc_coeff = 0;
00570                 s->left_block[block].not_null_dc = 0;
00571             }
00572             memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
00573             memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
00574 
00575             s->above_block_idx[0] = 1;
00576             s->above_block_idx[1] = 2;
00577             s->above_block_idx[2] = 1;
00578             s->above_block_idx[3] = 2;
00579             s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
00580             s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
00581 
00582             s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
00583             s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
00584             s->block_offset[1] = s->block_offset[0] + 8;
00585             s->block_offset[3] = s->block_offset[2] + 8;
00586             s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
00587             s->block_offset[5] = s->block_offset[4];
00588 
00589             for (mb_col=0; mb_col<s->mb_width; mb_col++) {
00590                 vp56_decode_mb(s, mb_row, mb_col, is_alpha);
00591 
00592                 for (y=0; y<4; y++) {
00593                     s->above_block_idx[y] += 2;
00594                     s->block_offset[y] += 16;
00595                 }
00596 
00597                 for (uv=4; uv<6; uv++) {
00598                     s->above_block_idx[uv] += 1;
00599                     s->block_offset[uv] += 8;
00600                 }
00601             }
00602         }
00603 
00604         if (p->key_frame || golden_frame) {
00605             if (s->framep[VP56_FRAME_GOLDEN]->data[0] &&
00606                 s->framep[VP56_FRAME_GOLDEN] != s->framep[VP56_FRAME_GOLDEN2])
00607                 avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
00608             s->framep[VP56_FRAME_GOLDEN] = p;
00609         }
00610 
00611         if (s->has_alpha) {
00612             FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN],
00613                               s->framep[VP56_FRAME_GOLDEN2]);
00614             buf += alpha_offset;
00615             remaining_buf_size -= alpha_offset;
00616         }
00617     }
00618 
00619     if (s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN] ||
00620         s->framep[VP56_FRAME_PREVIOUS] == s->framep[VP56_FRAME_GOLDEN2]) {
00621         if (s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN] &&
00622             s->framep[VP56_FRAME_UNUSED] != s->framep[VP56_FRAME_GOLDEN2])
00623             FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
00624                               s->framep[VP56_FRAME_UNUSED]);
00625         else
00626             FFSWAP(AVFrame *, s->framep[VP56_FRAME_PREVIOUS],
00627                               s->framep[VP56_FRAME_UNUSED2]);
00628     } else if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
00629         avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
00630     FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
00631                       s->framep[VP56_FRAME_PREVIOUS]);
00632 
00633     p->qstride = 0;
00634     p->qscale_table = s->qscale_table;
00635     p->qscale_type = FF_QSCALE_TYPE_VP56;
00636     *(AVFrame*)data = *p;
00637     *data_size = sizeof(AVFrame);
00638 
00639     return avpkt->size;
00640 }
00641 
00642 av_cold void vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
00643 {
00644     VP56Context *s = avctx->priv_data;
00645     int i;
00646 
00647     s->avctx = avctx;
00648     avctx->pix_fmt = has_alpha ? PIX_FMT_YUVA420P : PIX_FMT_YUV420P;
00649 
00650     if (avctx->idct_algo == FF_IDCT_AUTO)
00651         avctx->idct_algo = FF_IDCT_VP3;
00652     dsputil_init(&s->dsp, avctx);
00653     ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
00654     ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
00655 
00656     for (i=0; i<4; i++)
00657         s->framep[i] = &s->frames[i];
00658     s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
00659     s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
00660     s->edge_emu_buffer_alloc = NULL;
00661 
00662     s->above_blocks = NULL;
00663     s->macroblocks = NULL;
00664     s->quantizer = -1;
00665     s->deblock_filtering = 1;
00666 
00667     s->filter = NULL;
00668 
00669     s->has_alpha = has_alpha;
00670     if (flip) {
00671         s->flip = -1;
00672         s->frbi = 2;
00673         s->srbi = 0;
00674     } else {
00675         s->flip = 1;
00676         s->frbi = 0;
00677         s->srbi = 2;
00678     }
00679 }
00680 
00681 av_cold int vp56_free(AVCodecContext *avctx)
00682 {
00683     VP56Context *s = avctx->priv_data;
00684 
00685     av_freep(&s->qscale_table);
00686     av_freep(&s->above_blocks);
00687     av_freep(&s->macroblocks);
00688     av_freep(&s->edge_emu_buffer_alloc);
00689     if (s->framep[VP56_FRAME_GOLDEN]->data[0])
00690         avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN]);
00691     if (s->framep[VP56_FRAME_GOLDEN2]->data[0])
00692         avctx->release_buffer(avctx, s->framep[VP56_FRAME_GOLDEN2]);
00693     if (s->framep[VP56_FRAME_PREVIOUS]->data[0])
00694         avctx->release_buffer(avctx, s->framep[VP56_FRAME_PREVIOUS]);
00695     return 0;
00696 }

Generated on Fri Sep 16 2011 17:17:45 for FFmpeg by  doxygen 1.7.1