mirror of
https://github.com/FFmpeg/FFmpeg.git
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73 lines
2.1 KiB
C
73 lines
2.1 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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#include <stdint.h>
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// for FF_QSCALE_TYPE_*
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#include "libavcodec/internal.h"
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#include "libavutil/frame.h"
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#include "libavutil/mem.h"
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#include "libavutil/video_enc_params.h"
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#include "qp_table.h"
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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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AVFrameSideData *sd;
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AVVideoEncParams *par;
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unsigned int mb_h = (frame->height + 15) / 16;
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unsigned int mb_w = (frame->width + 15) / 16;
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unsigned int nb_mb = mb_h * mb_w;
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unsigned int block_idx;
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*table = NULL;
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sd = av_frame_get_side_data(frame, AV_FRAME_DATA_VIDEO_ENC_PARAMS);
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if (!sd)
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return 0;
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par = (AVVideoEncParams*)sd->data;
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if (par->type != AV_VIDEO_ENC_PARAMS_MPEG2 ||
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(par->nb_blocks != 0 && par->nb_blocks != nb_mb))
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return AVERROR(ENOSYS);
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*table = av_malloc(nb_mb);
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if (!*table)
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return AVERROR(ENOMEM);
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if (table_w)
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*table_w = mb_w;
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if (table_h)
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*table_h = mb_h;
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if (qscale_type)
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*qscale_type = FF_QSCALE_TYPE_MPEG2;
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if (par->nb_blocks == 0) {
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memset(*table, par->qp, nb_mb);
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return 0;
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}
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for (block_idx = 0; block_idx < nb_mb; block_idx++) {
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AVVideoBlockParams *b = av_video_enc_params_block(par, block_idx);
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(*table)[block_idx] = par->qp + b->delta_qp;
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}
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return 0;
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}
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