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