ios - 我可以在 iphone 12 上获得 PHAsset/PHAsset is hdr video/dolby vision 吗？

Question

我想添加 HDR 图标以指示某些 Assets 是 HDR，但如果这是来自 iphone12 的 HDR 视频记​​录，我无法获取任何信息来检查视频

Answer 1

+ (BOOL)isHDRVideo:(AVAsset *)avasset {
    if (!avasset) {
        return NO;
    }
    __block BOOL isHDRVideo = NO;
    [avasset.tracks enumerateObjectsUsingBlock:^(AVAssetTrack * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stopTracks) {
        [obj.formatDescriptions enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stopFormatDescriptions) {
            CMFormatDescriptionRef desc = (__bridge  CMVideoFormatDescriptionRef)obj;
            NSDictionary *dic = (__bridge NSDictionary *)CMFormatDescriptionGetExtensions(desc);
            NSString *imageBufferColorPrimaries = dic[(__bridge  id)kCVImageBufferColorPrimariesKey];
            if ([imageBufferColorPrimaries isEqualToString:(__bridge  id)kCVImageBufferColorPrimaries_ITU_R_2020]) {
                *stopFormatDescriptions = YES;
                *stopTracks = YES;
                isHDRVideo = YES;
            }
        }];
    }];
    
    return isHDRVideo;
}