private static IContainer LoadMetadataFromFFprobe(this IContainer resource)
{
var mediaLoader = new MediaLoader(resource);
if (mediaLoader.HasAudio)
{
resource.Streams.AddRange(mediaLoader.BaseData.Streams
.OfType <AudioStreamMetadata>()
.Select(audioMetadata => AudioStream.Create(MetadataInfo.Create(audioMetadata))));
}
if (mediaLoader.HasVideo)
{
resource.Streams.AddRange(mediaLoader.BaseData.Streams
.OfType <VideoStreamMetadata>()
.Select(videoMetadata => VideoStream.Create(MetadataInfo.Create(videoMetadata))));
}
if (mediaLoader.HasData)
{
resource.Streams.AddRange(mediaLoader.BaseData.Streams
.OfType <DataStreamMetadata>()
.Select(dataMetadata => DataStream.Create(MetadataInfo.Create(dataMetadata))));
}
return(resource);
}
private void Initialize(object file)
{
if ((ViewPageTotalSize / ViewPageCount) % this.BlockSize != 0)
{
throw new ArgumentException(string.Format("This '{0}' value of blockSize parameter is invalid.", this.BlockSize));
}
//计算缓存区总共有多少个存储块
_blockCount = (int)(StorageSize / this.BlockSize);
//计算缓存区的总大(为存储区长度+索引区长度+分配表区长度+文件头长度)
_capacity = StorageSize + (_blockCount * 4) + (36 * BufferUtility.KB) + MetadataInfo.HeadSize;
//判断传入参数是否为文件流
var fileStream = file as FileStream;
if (fileStream == null)
{
var fileInfo = new FileInfo((string)file);
if (fileInfo.Exists && fileInfo.Length > 0 && fileInfo.Length != _capacity)
{
throw new ArgumentException("file");
}
fileStream = new FileStream((string)file,
FileMode.OpenOrCreate,
FileAccess.ReadWrite,
FileShare.ReadWrite,
this.BlockSize,
FileOptions.RandomAccess);
if (fileStream.Length == 0)
{
fileStream.SetLength(_capacity);
}
}
else
{
if (fileStream.Length > 0 && fileStream.Length != _capacity)
{
throw new ArgumentException("file");
}
}
//创建内存映射文件对象
_memoryMappedFile = MemoryMappedFile.CreateFromFile(fileStream,
Path.GetFileName(fileStream.Name),
_capacity,
MemoryMappedFileAccess.ReadWrite,
null,
HandleInheritability.Inheritable,
false);
//构建默认的元数据描述对象
_metadata = MetadataInfo.Create(this.BlockSize, _blockCount);
//创建缓存页面管理器对象
_pageManager = new MemoryMappedPageManager(this, (uint)_metadata.StorageOffset);
}
public MetadataInfoTreeContainer EditInfo(MetadataInfoTreeContainer infoToUpdate, List <MetadataInfoTreeContainer> suppliedInfo)
{
var emptyMetadataInfo = MetadataInfo.Create();
emptyMetadataInfo.AudioMetadata = new AudioStreamMetadata
{
SampleRate = SampleRate ?? 44100,
Duration = TimeSpan.MaxValue,
DurationTs = long.MaxValue,
};
return(MetadataInfoTreeContainer.Create(AudioStream.Create(emptyMetadataInfo)));
}
public MetadataInfoTreeContainer EditInfo(MetadataInfoTreeContainer infoToUpdate, List <MetadataInfoTreeContainer> suppliedInfo)
{
var emptyMetadataInfo = MetadataInfo.Create();
emptyMetadataInfo.VideoMetadata = new VideoStreamMetadata
{
Width = Size.HasValue ? Size.Value.Width : 320,
Height = Size.HasValue ? Size.Value.Height : 240,
AverageFrameRate = Fraction.Create(FrameRate ?? 25, 1),
RFrameRate = Fraction.Create(FrameRate ?? 25, 1),
Duration = Duration ?? TimeSpan.MaxValue,
DurationTs = long.MaxValue,
};
return(MetadataInfoTreeContainer.Create(VideoStream.Create(emptyMetadataInfo)));
}
private static IContainer LoadMetadataFromFFprobe(this IContainer resource)
{
var mediaLoader = new Metadata.FFprobe.MediaLoader(resource);
if (mediaLoader.HasAudio)
{
var audioStreamMetadata = MetadataInfo.Create(mediaLoader.AudioStream);
resource.Streams.Add(AudioStream.Create(audioStreamMetadata));
}
if (mediaLoader.HasVideo)
{
var videoStreamMetadata = MetadataInfo.Create(mediaLoader.VideoStream);
resource.Streams.Add(VideoStream.Create(videoStreamMetadata));
}
return(resource);
}
public VideoStream()
{
Map = Helpers.NewMap();
Info = MetadataInfo.Create();
}