51 lines
1.6 KiB
C
51 lines
1.6 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef AVFILTER_QP_TABLE_H
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#define AVFILTER_QP_TABLE_H
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#include <stdint.h>
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#include "libavutil/frame.h"
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#include "libavcodec/internal.h"
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/**
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* Extract a libpostproc-compatible QP table - an 8-bit QP value per 16x16
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* macroblock, stored in raster order - from AVVideoEncParams side data.
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*/
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int ff_qp_table_extract(AVFrame *frame, int8_t **table, int *table_w, int *table_h,
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int *qscale_type);
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/**
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* Normalize the qscale factor
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* FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below
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* cannot be optimal
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*/
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static inline int ff_norm_qscale(int qscale, int type)
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{
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switch (type) {
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case FF_QSCALE_TYPE_MPEG1: return qscale;
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case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
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case FF_QSCALE_TYPE_H264: return qscale >> 2;
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case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
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}
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return qscale;
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}
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#endif // AVFILTER_QP_TABLE_H
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