mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
|
|
* Mpeg video formats-related defines and utility functions
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/frame.h"
|
|
#include "libavutil/pixdesc.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "mpegutils.h"
|
|
|
|
void ff_draw_horiz_band(AVCodecContext *avctx,
|
|
AVFrame *cur, AVFrame *last,
|
|
int y, int h, int picture_structure,
|
|
int first_field, int low_delay)
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
|
|
int vshift = desc->log2_chroma_h;
|
|
const int field_pic = picture_structure != PICT_FRAME;
|
|
if (field_pic) {
|
|
h <<= 1;
|
|
y <<= 1;
|
|
}
|
|
|
|
h = FFMIN(h, avctx->height - y);
|
|
|
|
if (field_pic && first_field &&
|
|
!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
|
|
return;
|
|
|
|
if (avctx->draw_horiz_band) {
|
|
AVFrame *src;
|
|
int offset[AV_NUM_DATA_POINTERS];
|
|
int i;
|
|
|
|
if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
|
|
(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
|
|
src = cur;
|
|
else if (last)
|
|
src = last;
|
|
else
|
|
return;
|
|
|
|
if (cur->pict_type == AV_PICTURE_TYPE_B &&
|
|
picture_structure == PICT_FRAME &&
|
|
avctx->codec_id != AV_CODEC_ID_SVQ3) {
|
|
for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
|
|
offset[i] = 0;
|
|
} else {
|
|
offset[0]= y * src->linesize[0];
|
|
offset[1]=
|
|
offset[2]= (y >> vshift) * src->linesize[1];
|
|
for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
|
|
offset[i] = 0;
|
|
}
|
|
|
|
emms_c();
|
|
|
|
avctx->draw_horiz_band(avctx, src, offset,
|
|
y, picture_structure, h);
|
|
}
|
|
}
|