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80 lines
2.5 KiB
80 lines
2.5 KiB
/* |
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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 FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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