/*
* 门面模式为子系统提供一组统一的接口，定义一组高层接口让子系统更易用。
* 门面模式提供统一入口 屏蔽使用者差异
*
* 适配器是做接口转换，解决的是原接口和目标接口不匹配的问题。
* 门面模式做接口整合，解决的是多接口调用带来的问题。
*/
/// <summary>
/// 对外提供了进行视频转换的简单接口
/// </summary>
/// <param name="fileName"></param>
/// <param name="format"></param>
/// <returns></returns>
public FileStream ConvertVideo(string fileName, string format)
{
Console.WriteLine("VideoConversionFacade: conversion started.");
VideoFile file = new VideoFile(fileName);
Codec sourceCodec = CodecFactory.Extract(file);
Codec destinationCodec;
if (format.Equals("mp4"))
{
destinationCodec = new OggCompressionCodec();
}
else
{
destinationCodec = new MPEG4CompressionCodec();
}
VideoFile buffer = BitrateReader.Read(file, sourceCodec);
VideoFile intermediateResult = BitrateReader.Convert(buffer, destinationCodec);
FileStream result = (new AudioMixer()).Fix(intermediateResult);
Console.WriteLine("VideoConversionFacade: conversion completed.");
return(result);
}
public static VideoFile Convert(VideoFile buffer, Codec codec)
{
Console.WriteLine("BitrateReader: writing file...");
return(buffer);
}
public static VideoFile Read(VideoFile file, Codec codec)
{
Console.WriteLine("BitrateReader: reading file...");
return(file);
}
/// <summary>
/// 添加音频
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
public FileStream Fix(VideoFile result)
{
Console.WriteLine("AudioMixer: fixing audio...");
return(File.Create("tmp"));
}
