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lavfi: add common code to handle QP tables

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It will be used for converting the *pp filters to the new
AVVideoEncParams API.
This commit is contained in:
Anton Khirnov 2020-12-14 14:36:05 +01:00
parent c72d526494
commit fba0ecbe20
2 changed files with 105 additions and 0 deletions
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72
libavfilter/qp_table.c Normal file
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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFmpeg 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdint.h>
// for FF_QSCALE_TYPE_*
#include "libavcodec/internal.h"
#include "libavutil/frame.h"
#include "libavutil/mem.h"
#include "libavutil/video_enc_params.h"
#include "qp_table.h"
int ff_qp_table_extract(AVFrame *frame, int8_t **table, int *table_w, int *table_h,
int *qscale_type)
{
AVFrameSideData *sd;
AVVideoEncParams *par;
unsigned int mb_h = (frame->height + 15) / 16;
unsigned int mb_w = (frame->width + 15) / 16;
unsigned int nb_mb = mb_h * mb_w;
unsigned int block_idx;
*table = NULL;
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_VIDEO_ENC_PARAMS);
if (!sd)
return 0;
par = (AVVideoEncParams*)sd->data;
if (par->type != AV_VIDEO_ENC_PARAMS_MPEG2 ||
(par->nb_blocks != 0 && par->nb_blocks != nb_mb))
return AVERROR(ENOSYS);
*table = av_malloc(nb_mb);
if (!*table)
return AVERROR(ENOMEM);
if (table_w)
*table_w = mb_w;
if (table_h)
*table_h = mb_h;
if (qscale_type)
*qscale_type = FF_QSCALE_TYPE_MPEG2;
if (par->nb_blocks == 0) {
memset(*table, par->qp, nb_mb);
return 0;
}
for (block_idx = 0; block_idx < nb_mb; block_idx++) {
AVVideoBlockParams *b = av_video_enc_params_block(par, block_idx);
(*table)[block_idx] = par->qp + b->delta_qp;
}
return 0;
}

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libavfilter/qp_table.h Normal file
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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFmpeg 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef AVFILTER_QP_TABLE_H
#define AVFILTER_QP_TABLE_H
#include <stdint.h>
#include "libavutil/frame.h"
/**
* Extract a libpostproc-compatible QP table - an 8-bit QP value per 16x16
* macroblock, stored in raster order - from AVVideoEncParams side data.
*/
int ff_qp_table_extract(AVFrame *frame, int8_t **table, int *table_w, int *table_h,
int *qscale_type);
#endif // AVFILTER_QP_TABLE_H