libavutil/mastering_display_metadata.c

   1 /**
   2  * Copyright (c) 2016 Neil Birkbeck <neil.birkbeck@gmail.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stddef.h>
  22 #include <stdint.h>
  23 #include <string.h>
  24
  25 #include "mastering_display_metadata.h"
  26 #include "mem.h"
  27
  28 static void get_defaults(AVMasteringDisplayMetadata *mastering)
  29 {
  30     for (int i = 0; i < 3; i++)
  31         for (int j = 0; j < 2; j++)
  32             mastering->display_primaries[i][j] = (AVRational) { 0, 1 };
  33     mastering->white_point[0] =
  34     mastering->white_point[1] =
  35     mastering->min_luminance  =
  36     mastering->max_luminance  = (AVRational) { 0, 1 };
  37 }
  38
  39 AVMasteringDisplayMetadata *av_mastering_display_metadata_alloc(void)
  40 {
  41     return av_mastering_display_metadata_alloc_size(NULL);
  42 }
  43
  44 AVMasteringDisplayMetadata *av_mastering_display_metadata_alloc_size(size_t *size)
  45 {
  46     AVMasteringDisplayMetadata *mastering = av_mallocz(sizeof(AVMasteringDisplayMetadata));
  47     if (!mastering)
  48         return NULL;
  49
  50     get_defaults(mastering);
  51
  52     if (size)
  53         *size = sizeof(*mastering);
  54
  55     return mastering;
  56 }
  57
  58 AVMasteringDisplayMetadata *av_mastering_display_metadata_create_side_data(AVFrame *frame)
  59 {
  60     AVFrameSideData *side_data = av_frame_new_side_data(frame,
  61                                                         AV_FRAME_DATA_MASTERING_DISPLAY_METADATA,
  62                                                         sizeof(AVMasteringDisplayMetadata));
  63     if (!side_data)
  64         return NULL;
  65
  66     memset(side_data->data, 0, sizeof(AVMasteringDisplayMetadata));
  67     get_defaults((AVMasteringDisplayMetadata *)side_data->data);
  68
  69     return (AVMasteringDisplayMetadata *)side_data->data;
  70 }
  71
  72 AVContentLightMetadata *av_content_light_metadata_alloc(size_t *size)
  73 {
  74     AVContentLightMetadata *metadata = av_mallocz(sizeof(AVContentLightMetadata));
  75
  76     if (size)
  77         *size = sizeof(*metadata);
  78
  79     return metadata;
  80 }
  81
  82 AVContentLightMetadata *av_content_light_metadata_create_side_data(AVFrame *frame)
  83 {
  84     AVFrameSideData *side_data = av_frame_new_side_data(frame,
  85                                                         AV_FRAME_DATA_CONTENT_LIGHT_LEVEL,
  86                                                         sizeof(AVContentLightMetadata));
  87     if (!side_data)
  88         return NULL;
  89
  90     memset(side_data->data, 0, sizeof(AVContentLightMetadata));
  91
  92     return (AVContentLightMetadata *)side_data->data;
  93 }