2 * Mpeg video formats-related defines and utility functions
4 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavutil/common.h"
24 #include "libavutil/frame.h"
25 #include "libavutil/pixdesc.h"
28 #include "mpegutils.h"
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
)
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
;
43 h
= FFMIN(h
, avctx
->height
- y
);
45 if (field_pic
&& first_field
&&
46 !(avctx
->slice_flags
& SLICE_FLAG_ALLOW_FIELD
))
49 if (avctx
->draw_horiz_band
) {
51 int offset
[AV_NUM_DATA_POINTERS
];
54 if (cur
->pict_type
== AV_PICTURE_TYPE_B
|| low_delay
||
55 (avctx
->slice_flags
& SLICE_FLAG_CODED_ORDER
))
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
++)
68 offset
[0]= y
* src
->linesize
[0];
70 offset
[2]= (y
>> vshift
) * src
->linesize
[1];
71 for (i
= 3; i
< AV_NUM_DATA_POINTERS
; i
++)
77 avctx
->draw_horiz_band(avctx
, src
, offset
,
78 y
, picture_structure
, h
);