libavfilter/qp_table.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef AVFILTER_QP_TABLE_H
  20 #define AVFILTER_QP_TABLE_H
  21
  22 #include <stdint.h>
  23
  24 #include "libavutil/frame.h"
  25 #include "libavutil/video_enc_params.h"
  26
  27 /**
  28  * Extract a libpostproc-compatible QP table - an 8-bit QP value per 16x16
  29  * macroblock, stored in raster order - from AVVideoEncParams side data.
  30  */
  31 int ff_qp_table_extract(AVFrame *frame, int8_t **table, int *table_w, int *table_h,
  32                         enum AVVideoEncParamsType *qscale_type);
  33
  34 /**
  35  * Normalize the qscale factor
  36  * FIXME Add support for other values of enum AVVideoEncParamsType
  37  * besides AV_VIDEO_ENC_PARAMS_MPEG2.
  38  */
  39 static inline int ff_norm_qscale(int qscale, enum AVVideoEncParamsType type)
  40 {
  41     switch (type) {
  42     case AV_VIDEO_ENC_PARAMS_MPEG2: return qscale >> 1;
  43     }
  44     return qscale;
  45 }
  46
  47 #endif // AVFILTER_QP_TABLE_H