yading@10: /*
yading@10:  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * VP5 and VP6 compatible video decoder (common features)
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "h264chroma.h"
yading@10: #include "vp56.h"
yading@10: #include "vp56data.h"
yading@10: 
yading@10: 
yading@10: void ff_vp56_init_dequant(VP56Context *s, int quantizer)
yading@10: {
yading@10:     s->quantizer = quantizer;
yading@10:     s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
yading@10:     s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
yading@10: }
yading@10: 
yading@10: static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
yading@10:                                        VP56Frame ref_frame)
yading@10: {
yading@10:     int nb_pred = 0;
yading@10:     VP56mv vect[2] = {{0,0}, {0,0}};
yading@10:     int pos, offset;
yading@10:     VP56mv mvp;
yading@10: 
yading@10:     for (pos=0; pos<12; pos++) {
yading@10:         mvp.x = col + vp56_candidate_predictor_pos[pos][0];
yading@10:         mvp.y = row + vp56_candidate_predictor_pos[pos][1];
yading@10:         if (mvp.x < 0 || mvp.x >= s->mb_width ||
yading@10:             mvp.y < 0 || mvp.y >= s->mb_height)
yading@10:             continue;
yading@10:         offset = mvp.x + s->mb_width*mvp.y;
yading@10: 
yading@10:         if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
yading@10:             continue;
yading@10:         if ((s->macroblocks[offset].mv.x == vect[0].x &&
yading@10:              s->macroblocks[offset].mv.y == vect[0].y) ||
yading@10:             (s->macroblocks[offset].mv.x == 0 &&
yading@10:              s->macroblocks[offset].mv.y == 0))
yading@10:             continue;
yading@10: 
yading@10:         vect[nb_pred++] = s->macroblocks[offset].mv;
yading@10:         if (nb_pred > 1) {
yading@10:             nb_pred = -1;
yading@10:             break;
yading@10:         }
yading@10:         s->vector_candidate_pos = pos;
yading@10:     }
yading@10: 
yading@10:     s->vector_candidate[0] = vect[0];
yading@10:     s->vector_candidate[1] = vect[1];
yading@10: 
yading@10:     return nb_pred+1;
yading@10: }
yading@10: 
yading@10: static void vp56_parse_mb_type_models(VP56Context *s)
yading@10: {
yading@10:     VP56RangeCoder *c = &s->c;
yading@10:     VP56Model *model = s->modelp;
yading@10:     int i, ctx, type;
yading@10: 
yading@10:     for (ctx=0; ctx<3; ctx++) {
yading@10:         if (vp56_rac_get_prob(c, 174)) {
yading@10:             int idx = vp56_rac_gets(c, 4);
yading@10:             memcpy(model->mb_types_stats[ctx],
yading@10:                    vp56_pre_def_mb_type_stats[idx][ctx],
yading@10:                    sizeof(model->mb_types_stats[ctx]));
yading@10:         }
yading@10:         if (vp56_rac_get_prob(c, 254)) {
yading@10:             for (type=0; type<10; type++) {
yading@10:                 for(i=0; i<2; i++) {
yading@10:                     if (vp56_rac_get_prob(c, 205)) {
yading@10:                         int delta, sign = vp56_rac_get(c);
yading@10: 
yading@10:                         delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
yading@10:                                                   vp56_mb_type_model_model);
yading@10:                         if (!delta)
yading@10:                             delta = 4 * vp56_rac_gets(c, 7);
yading@10:                         model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
yading@10:                     }
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* compute MB type probability tables based on previous MB type */
yading@10:     for (ctx=0; ctx<3; ctx++) {
yading@10:         int p[10];
yading@10: 
yading@10:         for (type=0; type<10; type++)
yading@10:             p[type] = 100 * model->mb_types_stats[ctx][type][1];
yading@10: 
yading@10:         for (type=0; type<10; type++) {
yading@10:             int p02, p34, p0234, p17, p56, p89, p5689, p156789;
yading@10: 
yading@10:             /* conservative MB type probability */
yading@10:             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]);
yading@10: 
yading@10:             p[type] = 0;    /* same MB type => weight is null */
yading@10: 
yading@10:             /* binary tree parsing probabilities */
yading@10:             p02 = p[0] + p[2];
yading@10:             p34 = p[3] + p[4];
yading@10:             p0234 = p02 + p34;
yading@10:             p17 = p[1] + p[7];
yading@10:             p56 = p[5] + p[6];
yading@10:             p89 = p[8] + p[9];
yading@10:             p5689 = p56 + p89;
yading@10:             p156789 = p17 + p5689;
yading@10: 
yading@10:             model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
yading@10:             model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
yading@10:             model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
yading@10:             model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
yading@10:             model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
yading@10:             model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
yading@10:             model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
yading@10:             model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
yading@10:             model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
yading@10: 
yading@10:             /* restore initial value */
yading@10:             p[type] = 100 * model->mb_types_stats[ctx][type][1];
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static VP56mb vp56_parse_mb_type(VP56Context *s,
yading@10:                                  VP56mb prev_type, int ctx)
yading@10: {
yading@10:     uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
yading@10:     VP56RangeCoder *c = &s->c;
yading@10: 
yading@10:     if (vp56_rac_get_prob(c, mb_type_model[0]))
yading@10:         return prev_type;
yading@10:     else
yading@10:         return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
yading@10: }
yading@10: 
yading@10: static void vp56_decode_4mv(VP56Context *s, int row, int col)
yading@10: {
yading@10:     VP56mv mv = {0,0};
yading@10:     int type[4];
yading@10:     int b;
yading@10: 
yading@10:     /* parse each block type */
yading@10:     for (b=0; b<4; b++) {
yading@10:         type[b] = vp56_rac_gets(&s->c, 2);
yading@10:         if (type[b])
yading@10:             type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */
yading@10:     }
yading@10: 
yading@10:     /* get vectors */
yading@10:     for (b=0; b<4; b++) {
yading@10:         switch (type[b]) {
yading@10:             case VP56_MB_INTER_NOVEC_PF:
yading@10:                 s->mv[b] = (VP56mv) {0,0};
yading@10:                 break;
yading@10:             case VP56_MB_INTER_DELTA_PF:
yading@10:                 s->parse_vector_adjustment(s, &s->mv[b]);
yading@10:                 break;
yading@10:             case VP56_MB_INTER_V1_PF:
yading@10:                 s->mv[b] = s->vector_candidate[0];
yading@10:                 break;
yading@10:             case VP56_MB_INTER_V2_PF:
yading@10:                 s->mv[b] = s->vector_candidate[1];
yading@10:                 break;
yading@10:         }
yading@10:         mv.x += s->mv[b].x;
yading@10:         mv.y += s->mv[b].y;
yading@10:     }
yading@10: 
yading@10:     /* this is the one selected for the whole MB for prediction */
yading@10:     s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
yading@10: 
yading@10:     /* chroma vectors are average luma vectors */
yading@10:     if (s->avctx->codec->id == AV_CODEC_ID_VP5) {
yading@10:         s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
yading@10:         s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
yading@10:     } else {
yading@10:         s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
yading@10:     }
yading@10: }
yading@10: 
yading@10: static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
yading@10: {
yading@10:     VP56mv *mv, vect = {0,0};
yading@10:     int ctx, b;
yading@10: 
yading@10:     ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
yading@10:     s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
yading@10:     s->macroblocks[row * s->mb_width + col].type = s->mb_type;
yading@10: 
yading@10:     switch (s->mb_type) {
yading@10:         case VP56_MB_INTER_V1_PF:
yading@10:             mv = &s->vector_candidate[0];
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_V2_PF:
yading@10:             mv = &s->vector_candidate[1];
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_V1_GF:
yading@10:             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
yading@10:             mv = &s->vector_candidate[0];
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_V2_GF:
yading@10:             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
yading@10:             mv = &s->vector_candidate[1];
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_DELTA_PF:
yading@10:             s->parse_vector_adjustment(s, &vect);
yading@10:             mv = &vect;
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_DELTA_GF:
yading@10:             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
yading@10:             s->parse_vector_adjustment(s, &vect);
yading@10:             mv = &vect;
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_4V:
yading@10:             vp56_decode_4mv(s, row, col);
yading@10:             return s->mb_type;
yading@10: 
yading@10:         default:
yading@10:             mv = &vect;
yading@10:             break;
yading@10:     }
yading@10: 
yading@10:     s->macroblocks[row*s->mb_width + col].mv = *mv;
yading@10: 
yading@10:     /* same vector for all blocks */
yading@10:     for (b=0; b<6; b++)
yading@10:         s->mv[b] = *mv;
yading@10: 
yading@10:     return s->mb_type;
yading@10: }
yading@10: 
yading@10: static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
yading@10: {
yading@10:     int idx = s->idct_scantable[0];
yading@10:     int b;
yading@10: 
yading@10:     for (b=0; b<6; b++) {
yading@10:         VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
yading@10:         VP56RefDc *lb = &s->left_block[ff_vp56_b6to4[b]];
yading@10:         int count = 0;
yading@10:         int dc = 0;
yading@10:         int i;
yading@10: 
yading@10:         if (ref_frame == lb->ref_frame) {
yading@10:             dc += lb->dc_coeff;
yading@10:             count++;
yading@10:         }
yading@10:         if (ref_frame == ab->ref_frame) {
yading@10:             dc += ab->dc_coeff;
yading@10:             count++;
yading@10:         }
yading@10:         if (s->avctx->codec->id == AV_CODEC_ID_VP5)
yading@10:             for (i=0; i<2; i++)
yading@10:                 if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
yading@10:                     dc += ab[-1+2*i].dc_coeff;
yading@10:                     count++;
yading@10:                 }
yading@10:         if (count == 0)
yading@10:             dc = s->prev_dc[ff_vp56_b2p[b]][ref_frame];
yading@10:         else if (count == 2)
yading@10:             dc /= 2;
yading@10: 
yading@10:         s->block_coeff[b][idx] += dc;
yading@10:         s->prev_dc[ff_vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
yading@10:         ab->dc_coeff = s->block_coeff[b][idx];
yading@10:         ab->ref_frame = ref_frame;
yading@10:         lb->dc_coeff = s->block_coeff[b][idx];
yading@10:         lb->ref_frame = ref_frame;
yading@10:         s->block_coeff[b][idx] *= s->dequant_dc;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
yading@10:                                 int stride, int dx, int dy)
yading@10: {
yading@10:     int t = vp56_filter_threshold[s->quantizer];
yading@10:     if (dx)  s->vp56dsp.edge_filter_hor(yuv +         10-dx , stride, t);
yading@10:     if (dy)  s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
yading@10: }
yading@10: 
yading@10: static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
yading@10:                     int stride, int x, int y)
yading@10: {
yading@10:     uint8_t *dst = s->frames[VP56_FRAME_CURRENT]->data[plane] + s->block_offset[b];
yading@10:     uint8_t *src_block;
yading@10:     int src_offset;
yading@10:     int overlap_offset = 0;
yading@10:     int mask = s->vp56_coord_div[b] - 1;
yading@10:     int deblock_filtering = s->deblock_filtering;
yading@10:     int dx;
yading@10:     int dy;
yading@10: 
yading@10:     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
yading@10:         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
yading@10:          && !s->frames[VP56_FRAME_CURRENT]->key_frame))
yading@10:         deblock_filtering = 0;
yading@10: 
yading@10:     dx = s->mv[b].x / s->vp56_coord_div[b];
yading@10:     dy = s->mv[b].y / s->vp56_coord_div[b];
yading@10: 
yading@10:     if (b >= 4) {
yading@10:         x /= 2;
yading@10:         y /= 2;
yading@10:     }
yading@10:     x += dx - 2;
yading@10:     y += dy - 2;
yading@10: 
yading@10:     if (x<0 || x+12>=s->plane_width[plane] ||
yading@10:         y<0 || y+12>=s->plane_height[plane]) {
yading@10:         s->vdsp.emulated_edge_mc(s->edge_emu_buffer,
yading@10:                             src + s->block_offset[b] + (dy-2)*stride + (dx-2),
yading@10:                             stride, 12, 12, x, y,
yading@10:                             s->plane_width[plane],
yading@10:                             s->plane_height[plane]);
yading@10:         src_block = s->edge_emu_buffer;
yading@10:         src_offset = 2 + 2*stride;
yading@10:     } else if (deblock_filtering) {
yading@10:         /* only need a 12x12 block, but there is no such dsp function, */
yading@10:         /* so copy a 16x12 block */
yading@10:         s->hdsp.put_pixels_tab[0][0](s->edge_emu_buffer,
yading@10:                                      src + s->block_offset[b] + (dy-2)*stride + (dx-2),
yading@10:                                      stride, 12);
yading@10:         src_block = s->edge_emu_buffer;
yading@10:         src_offset = 2 + 2*stride;
yading@10:     } else {
yading@10:         src_block = src;
yading@10:         src_offset = s->block_offset[b] + dy*stride + dx;
yading@10:     }
yading@10: 
yading@10:     if (deblock_filtering)
yading@10:         vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
yading@10: 
yading@10:     if (s->mv[b].x & mask)
yading@10:         overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
yading@10:     if (s->mv[b].y & mask)
yading@10:         overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
yading@10: 
yading@10:     if (overlap_offset) {
yading@10:         if (s->filter)
yading@10:             s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
yading@10:                       stride, s->mv[b], mask, s->filter_selection, b<4);
yading@10:         else
yading@10:             s->vp3dsp.put_no_rnd_pixels_l2(dst, src_block+src_offset,
yading@10:                                            src_block+src_offset+overlap_offset,
yading@10:                                            stride, 8);
yading@10:     } else {
yading@10:         s->hdsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
yading@10: {
yading@10:     AVFrame *frame_current, *frame_ref;
yading@10:     VP56mb mb_type;
yading@10:     VP56Frame ref_frame;
yading@10:     int b, ab, b_max, plane, off;
yading@10: 
yading@10:     if (s->frames[VP56_FRAME_CURRENT]->key_frame)
yading@10:         mb_type = VP56_MB_INTRA;
yading@10:     else
yading@10:         mb_type = vp56_decode_mv(s, row, col);
yading@10:     ref_frame = vp56_reference_frame[mb_type];
yading@10: 
yading@10:     s->parse_coeff(s);
yading@10: 
yading@10:     vp56_add_predictors_dc(s, ref_frame);
yading@10: 
yading@10:     frame_current = s->frames[VP56_FRAME_CURRENT];
yading@10:     frame_ref = s->frames[ref_frame];
yading@10:     if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
yading@10:         return;
yading@10: 
yading@10:     ab = 6*is_alpha;
yading@10:     b_max = 6 - 2*is_alpha;
yading@10: 
yading@10:     switch (mb_type) {
yading@10:         case VP56_MB_INTRA:
yading@10:             for (b=0; b<b_max; b++) {
yading@10:                 plane = ff_vp56_b2p[b+ab];
yading@10:                 s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
yading@10:                                 s->stride[plane], s->block_coeff[b]);
yading@10:             }
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_NOVEC_PF:
yading@10:         case VP56_MB_INTER_NOVEC_GF:
yading@10:             for (b=0; b<b_max; b++) {
yading@10:                 plane = ff_vp56_b2p[b+ab];
yading@10:                 off = s->block_offset[b];
yading@10:                 s->hdsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
yading@10:                                              frame_ref->data[plane] + off,
yading@10:                                              s->stride[plane], 8);
yading@10:                 s->vp3dsp.idct_add(frame_current->data[plane] + off,
yading@10:                                 s->stride[plane], s->block_coeff[b]);
yading@10:             }
yading@10:             break;
yading@10: 
yading@10:         case VP56_MB_INTER_DELTA_PF:
yading@10:         case VP56_MB_INTER_V1_PF:
yading@10:         case VP56_MB_INTER_V2_PF:
yading@10:         case VP56_MB_INTER_DELTA_GF:
yading@10:         case VP56_MB_INTER_4V:
yading@10:         case VP56_MB_INTER_V1_GF:
yading@10:         case VP56_MB_INTER_V2_GF:
yading@10:             for (b=0; b<b_max; b++) {
yading@10:                 int x_off = b==1 || b==3 ? 8 : 0;
yading@10:                 int y_off = b==2 || b==3 ? 8 : 0;
yading@10:                 plane = ff_vp56_b2p[b+ab];
yading@10:                 vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
yading@10:                         16*col+x_off, 16*row+y_off);
yading@10:                 s->vp3dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
yading@10:                                 s->stride[plane], s->block_coeff[b]);
yading@10:             }
yading@10:             break;
yading@10:     }
yading@10: 
yading@10:     if (is_alpha) {
yading@10:         s->block_coeff[4][0] = 0;
yading@10:         s->block_coeff[5][0] = 0;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int vp56_size_changed(VP56Context *s)
yading@10: {
yading@10:     AVCodecContext *avctx = s->avctx;
yading@10:     int stride = s->frames[VP56_FRAME_CURRENT]->linesize[0];
yading@10:     int i;
yading@10: 
yading@10:     s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;
yading@10:     s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;
yading@10:     s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
yading@10:     s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
yading@10: 
yading@10:     for (i=0; i<4; i++)
yading@10:         s->stride[i] = s->flip * s->frames[VP56_FRAME_CURRENT]->linesize[i];
yading@10: 
yading@10:     s->mb_width  = (avctx->coded_width +15) / 16;
yading@10:     s->mb_height = (avctx->coded_height+15) / 16;
yading@10: 
yading@10:     if (s->mb_width > 1000 || s->mb_height > 1000) {
yading@10:         avcodec_set_dimensions(avctx, 0, 0);
yading@10:         av_log(avctx, AV_LOG_ERROR, "picture too big\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     s->above_blocks = av_realloc(s->above_blocks,
yading@10:                                  (4*s->mb_width+6) * sizeof(*s->above_blocks));
yading@10:     s->macroblocks = av_realloc(s->macroblocks,
yading@10:                                 s->mb_width*s->mb_height*sizeof(*s->macroblocks));
yading@10:     av_free(s->edge_emu_buffer_alloc);
yading@10:     s->edge_emu_buffer_alloc = av_malloc(16*stride);
yading@10:     s->edge_emu_buffer = s->edge_emu_buffer_alloc;
yading@10:     if (s->flip < 0)
yading@10:         s->edge_emu_buffer += 15 * stride;
yading@10: 
yading@10:     if (s->alpha_context)
yading@10:         return vp56_size_changed(s->alpha_context);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *, int, int);
yading@10: 
yading@10: int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                          AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     VP56Context *s = avctx->priv_data;
yading@10:     AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
yading@10:     int remaining_buf_size = avpkt->size;
yading@10:     int av_uninit(alpha_offset);
yading@10:     int i, res;
yading@10:     int ret;
yading@10: 
yading@10:     if (s->has_alpha) {
yading@10:         if (remaining_buf_size < 3)
yading@10:             return -1;
yading@10:         alpha_offset = bytestream_get_be24(&buf);
yading@10:         remaining_buf_size -= 3;
yading@10:         if (remaining_buf_size < alpha_offset)
yading@10:             return -1;
yading@10:     }
yading@10: 
yading@10:     res = s->parse_header(s, buf, remaining_buf_size);
yading@10:     if (res < 0)
yading@10:         return res;
yading@10: 
yading@10:     if (res == VP56_SIZE_CHANGE) {
yading@10:         for (i = 0; i < 4; i++) {
yading@10:             av_frame_unref(s->frames[i]);
yading@10:             if (s->alpha_context)
yading@10:                 av_frame_unref(s->alpha_context->frames[i]);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0)
yading@10:         return -1;
yading@10: 
yading@10:     if (s->has_alpha) {
yading@10:         av_frame_unref(s->alpha_context->frames[VP56_FRAME_CURRENT]);
yading@10:         if ((ret = av_frame_ref(s->alpha_context->frames[VP56_FRAME_CURRENT], p)) < 0) {
yading@10:             av_frame_unref(p);
yading@10:             return ret;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (res == VP56_SIZE_CHANGE) {
yading@10:         if (vp56_size_changed(s)) {
yading@10:             av_frame_unref(p);
yading@10:             return -1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (s->has_alpha) {
yading@10:         int bak_w = avctx->width;
yading@10:         int bak_h = avctx->height;
yading@10:         int bak_cw = avctx->coded_width;
yading@10:         int bak_ch = avctx->coded_height;
yading@10:         buf += alpha_offset;
yading@10:         remaining_buf_size -= alpha_offset;
yading@10: 
yading@10:         res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);
yading@10:         if (res != 0) {
yading@10:             if(res==VP56_SIZE_CHANGE) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");
yading@10:                 avctx->width  = bak_w;
yading@10:                 avctx->height = bak_h;
yading@10:                 avctx->coded_width  = bak_cw;
yading@10:                 avctx->coded_height = bak_ch;
yading@10:             }
yading@10:             av_frame_unref(p);
yading@10:             return -1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, s->has_alpha + 1);
yading@10: 
yading@10:     if ((res = av_frame_ref(data, p)) < 0)
yading@10:         return res;
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
yading@10:                               int jobnr, int threadnr)
yading@10: {
yading@10:     VP56Context *s0 = avctx->priv_data;
yading@10:     int is_alpha = (jobnr == 1);
yading@10:     VP56Context *s = is_alpha ? s0->alpha_context : s0;
yading@10:     AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
yading@10:     int mb_row, mb_col, mb_row_flip, mb_offset = 0;
yading@10:     int block, y, uv, stride_y, stride_uv;
yading@10:     int res;
yading@10: 
yading@10:     if (p->key_frame) {
yading@10:         p->pict_type = AV_PICTURE_TYPE_I;
yading@10:         s->default_models_init(s);
yading@10:         for (block=0; block<s->mb_height*s->mb_width; block++)
yading@10:             s->macroblocks[block].type = VP56_MB_INTRA;
yading@10:     } else {
yading@10:         p->pict_type = AV_PICTURE_TYPE_P;
yading@10:         vp56_parse_mb_type_models(s);
yading@10:         s->parse_vector_models(s);
yading@10:         s->mb_type = VP56_MB_INTER_NOVEC_PF;
yading@10:     }
yading@10: 
yading@10:     if (s->parse_coeff_models(s))
yading@10:         goto next;
yading@10: 
yading@10:     memset(s->prev_dc, 0, sizeof(s->prev_dc));
yading@10:     s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
yading@10:     s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
yading@10: 
yading@10:     for (block=0; block < 4*s->mb_width+6; block++) {
yading@10:         s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
yading@10:         s->above_blocks[block].dc_coeff = 0;
yading@10:         s->above_blocks[block].not_null_dc = 0;
yading@10:     }
yading@10:     s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
yading@10:     s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
yading@10: 
yading@10:     stride_y  = p->linesize[0];
yading@10:     stride_uv = p->linesize[1];
yading@10: 
yading@10:     if (s->flip < 0)
yading@10:         mb_offset = 7;
yading@10: 
yading@10:     /* main macroblocks loop */
yading@10:     for (mb_row=0; mb_row<s->mb_height; mb_row++) {
yading@10:         if (s->flip < 0)
yading@10:             mb_row_flip = s->mb_height - mb_row - 1;
yading@10:         else
yading@10:             mb_row_flip = mb_row;
yading@10: 
yading@10:         for (block=0; block<4; block++) {
yading@10:             s->left_block[block].ref_frame = VP56_FRAME_NONE;
yading@10:             s->left_block[block].dc_coeff = 0;
yading@10:             s->left_block[block].not_null_dc = 0;
yading@10:         }
yading@10:         memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
yading@10:         memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
yading@10: 
yading@10:         s->above_block_idx[0] = 1;
yading@10:         s->above_block_idx[1] = 2;
yading@10:         s->above_block_idx[2] = 1;
yading@10:         s->above_block_idx[3] = 2;
yading@10:         s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
yading@10:         s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
yading@10: 
yading@10:         s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
yading@10:         s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
yading@10:         s->block_offset[1] = s->block_offset[0] + 8;
yading@10:         s->block_offset[3] = s->block_offset[2] + 8;
yading@10:         s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
yading@10:         s->block_offset[5] = s->block_offset[4];
yading@10: 
yading@10:         for (mb_col=0; mb_col<s->mb_width; mb_col++) {
yading@10:             vp56_decode_mb(s, mb_row, mb_col, is_alpha);
yading@10: 
yading@10:             for (y=0; y<4; y++) {
yading@10:                 s->above_block_idx[y] += 2;
yading@10:                 s->block_offset[y] += 16;
yading@10:             }
yading@10: 
yading@10:             for (uv=4; uv<6; uv++) {
yading@10:                 s->above_block_idx[uv] += 1;
yading@10:                 s->block_offset[uv] += 8;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10: next:
yading@10:     if (p->key_frame || s->golden_frame) {
yading@10:         av_frame_unref(s->frames[VP56_FRAME_GOLDEN]);
yading@10:         if ((res = av_frame_ref(s->frames[VP56_FRAME_GOLDEN], p)) < 0)
yading@10:             return res;
yading@10:     }
yading@10: 
yading@10:     av_frame_unref(s->frames[VP56_FRAME_PREVIOUS]);
yading@10:     FFSWAP(AVFrame *, s->frames[VP56_FRAME_CURRENT],
yading@10:                       s->frames[VP56_FRAME_PREVIOUS]);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
yading@10: {
yading@10:     VP56Context *s = avctx->priv_data;
yading@10:     return ff_vp56_init_context(avctx, s, flip, has_alpha);
yading@10: }
yading@10: 
yading@10: av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
yading@10:                                   int flip, int has_alpha)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10:     avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
yading@10: 
yading@10:     ff_h264chroma_init(&s->h264chroma, 8);
yading@10:     ff_hpeldsp_init(&s->hdsp, avctx->flags);
yading@10:     ff_videodsp_init(&s->vdsp, 8);
yading@10:     ff_vp3dsp_init(&s->vp3dsp, avctx->flags);
yading@10:     ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
yading@10:     for (i = 0; i < 64; i++) {
yading@10: #define T(x) (x >> 3) | ((x & 7) << 3)
yading@10:         s->idct_scantable[i] = T(ff_zigzag_direct[i]);
yading@10: #undef T
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++) {
yading@10:         s->frames[i] = av_frame_alloc();
yading@10:         if (!s->frames[i]) {
yading@10:             ff_vp56_free(avctx);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10:     s->edge_emu_buffer_alloc = NULL;
yading@10: 
yading@10:     s->above_blocks = NULL;
yading@10:     s->macroblocks = NULL;
yading@10:     s->quantizer = -1;
yading@10:     s->deblock_filtering = 1;
yading@10:     s->golden_frame = 0;
yading@10: 
yading@10:     s->filter = NULL;
yading@10: 
yading@10:     s->has_alpha = has_alpha;
yading@10: 
yading@10:     s->modelp = &s->model;
yading@10: 
yading@10:     if (flip) {
yading@10:         s->flip = -1;
yading@10:         s->frbi = 2;
yading@10:         s->srbi = 0;
yading@10:     } else {
yading@10:         s->flip = 1;
yading@10:         s->frbi = 0;
yading@10:         s->srbi = 2;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: av_cold int ff_vp56_free(AVCodecContext *avctx)
yading@10: {
yading@10:     VP56Context *s = avctx->priv_data;
yading@10:     return ff_vp56_free_context(s);
yading@10: }
yading@10: 
yading@10: av_cold int ff_vp56_free_context(VP56Context *s)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     av_freep(&s->above_blocks);
yading@10:     av_freep(&s->macroblocks);
yading@10:     av_freep(&s->edge_emu_buffer_alloc);
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++)
yading@10:         av_frame_free(&s->frames[i]);
yading@10: 
yading@10:     return 0;
yading@10: }