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2ba45a60 DM |
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 | } |