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2b9aea7756
sub_median_pred_mmxext() calculates a predictor from the left, top
and topleft pixel values. The left value is simply read via
ptr[-1], although this is not guaranteed to be inside the buffer
in case of negative strides. This happens e.g. with
ffmpeg -i fate-suite/mpeg2/dvd_single_frame.vob -vf vflip \
-c:v magicyuv -pred median -f null -
Fix this by reading the first value like the topleft value.
Also change the documentation of sub_median_pred to reflect this
change (and the one from 791b5954bc).
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/*
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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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#ifndef AVCODEC_LOSSLESS_VIDEOENCDSP_H
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#define AVCODEC_LOSSLESS_VIDEOENCDSP_H
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#include <stddef.h>
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#include <stdint.h>
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typedef struct LLVidEncDSPContext {
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void (*diff_bytes)(uint8_t *dst /* align 1 */,
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const uint8_t *src1 /* align 1 */,
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const uint8_t *src2 /* align 1 */,
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intptr_t w);
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/**
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* Subtract HuffYUV's variant of median prediction.
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*/
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void (*sub_median_pred)(uint8_t *dst, const uint8_t *src1,
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const uint8_t *src2, intptr_t w,
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int *left, int *left_top);
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void (*sub_left_predict)(uint8_t *dst, const uint8_t *src,
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ptrdiff_t stride, ptrdiff_t width, int height);
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} LLVidEncDSPContext;
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void ff_llvidencdsp_init(LLVidEncDSPContext *c);
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void ff_llvidencdsp_init_riscv(LLVidEncDSPContext *c);
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void ff_llvidencdsp_init_x86(LLVidEncDSPContext *c);
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#endif /* AVCODEC_LOSSLESS_VIDEOENCDSP_H */
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