blob: 62cc36aa6e0ca4b8279fae5fcdf8be02ef31d781
1 | /* |
2 | * Mpeg video formats-related defines and utility functions |
3 | * |
4 | * This file is part of FFmpeg. |
5 | * |
6 | * FFmpeg is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2.1 of the License, or (at your option) any later version. |
10 | * |
11 | * FFmpeg is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with FFmpeg; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
21 | #include <stdint.h> |
22 | |
23 | #include "libavutil/common.h" |
24 | #include "libavutil/frame.h" |
25 | #include "libavutil/pixdesc.h" |
26 | |
27 | #include "avcodec.h" |
28 | #include "mpegutils.h" |
29 | |
30 | void ff_draw_horiz_band(AVCodecContext *avctx, |
31 | AVFrame *cur, AVFrame *last, |
32 | int y, int h, int picture_structure, |
33 | int first_field, int low_delay) |
34 | { |
35 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt); |
36 | int vshift = desc->log2_chroma_h; |
37 | const int field_pic = picture_structure != PICT_FRAME; |
38 | if (field_pic) { |
39 | h <<= 1; |
40 | y <<= 1; |
41 | } |
42 | |
43 | h = FFMIN(h, avctx->height - y); |
44 | |
45 | if (field_pic && first_field && |
46 | !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) |
47 | return; |
48 | |
49 | if (avctx->draw_horiz_band) { |
50 | AVFrame *src; |
51 | int offset[AV_NUM_DATA_POINTERS]; |
52 | int i; |
53 | |
54 | if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay || |
55 | (avctx->slice_flags & SLICE_FLAG_CODED_ORDER)) |
56 | src = cur; |
57 | else if (last) |
58 | src = last; |
59 | else |
60 | return; |
61 | |
62 | if (cur->pict_type == AV_PICTURE_TYPE_B && |
63 | picture_structure == PICT_FRAME && |
64 | avctx->codec_id != AV_CODEC_ID_SVQ3) { |
65 | for (i = 0; i < AV_NUM_DATA_POINTERS; i++) |
66 | offset[i] = 0; |
67 | } else { |
68 | offset[0]= y * src->linesize[0]; |
69 | offset[1]= |
70 | offset[2]= (y >> vshift) * src->linesize[1]; |
71 | for (i = 3; i < AV_NUM_DATA_POINTERS; i++) |
72 | offset[i] = 0; |
73 | } |
74 | |
75 | emms_c(); |
76 | |
77 | avctx->draw_horiz_band(avctx, src, offset, |
78 | y, picture_structure, h); |
79 | } |
80 | } |
81 |