using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.IO;
using System.Web;
namespace AUV5.Common
{
public class FormatConverter
{
//FFmpeg配置信息
private string ffmpegpath = "/FFmpeg/ffmpeg.exe";//FFmpeg的服務器路徑
private string imgsize = "400*300"; //視頻截圖大小
private string videosize = "480*360"; //視頻大小
#region 也可將信息添加到配置文件中
//public static string ffmpegpath = ConfigurationManager.AppSettings["ffmpeg"];
//public static string imgsize = ConfigurationManager.AppSettings["imgsize"];
//public static string videosize = ConfigurationManager.AppSettings["videoize"];
#endregion
private string destVideo = "";
/// <summary>
/// 視頻路徑
/// </summary>
public string DestVideo
{
get { return destVideo; }
set { destVideo = value; }
}
private string destImage = "";
/// <summary>
/// 圖片路徑
/// </summary>
public string DestImage
{
get { return destImage; }
set { destImage = value; }
}
/// <summary>
/// 視頻長度
/// </summary>
public string VideoLength { get; set; }
//文件類型
public enum VideoType
{
[Description(".avi")]
AVI,
[Description(".mov")]
MOV,
[Description(".mpg")]
MPG,
[Description(".mp4")]
MP4,
[Description(".flv")]
FLV
}
/// <summary>
/// 返回枚舉類型的描述信息
/// </summary>
/// <param name="myEnum"></param>
/// <returns></returns>
private string GetDiscription(System.Enum myEnum)
{
System.Reflection.FieldInfo fieldInfo = myEnum.GetType().GetField(myEnum.ToString());
object[] attrs = fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (attrs != null && attrs.Length > 0)
{
DescriptionAttribute desc = attrs[0] as DescriptionAttribute;
if (desc != null)
{
return desc.Description.ToLower();
}
}
return myEnum.ToString();
}
//將GetDesCription定義爲擴展方法,需.net3.5
//public static string Description(this Enum myEnum)
//{
// return GetDiscription(myEnum);
//}
//構造函數
//創建目錄
public FormatConverter()
{
}
#region 使用FFmpeg進行格式轉換
/// <summary>
/// 運行格式轉換
/// </summary>
/// <param name="sourceFile">要轉換文件絕對路徑</param>
/// <param name="destPath">轉換結果存儲的相對路徑</param>
/// <param name="videotype">要轉換成的文件類型</param>
/// <param name="createImage">是否生成截圖</param>
/// <returns>
/// 執行成功返回空，否則返回錯誤信息
/// </returns>
public string Convert(string sourceFile, string destPath,string uniquename, VideoType videotype, bool createImage,bool getDuration)
{
//取得ffmpeg.exe的物理路徑
string ffmpeg = System.Web.HttpContext.Current.Server.MapPath(ffmpegpath);
if (!File.Exists(ffmpeg))
{
return "找不到格式轉換程序！";
}
if (!File.Exists(sourceFile))
{
return "找不到源文件！";
}
//string uniquename = FileHelper.GetUniqueFileName();
string filename = uniquename + GetDiscription(videotype);
string destFile = HttpContext.Current.Server.MapPath(destPath + filename);
//if (Path.GetExtension(sourceFile).ToLower() != GetDiscription(videotype).ToLower())
//{
System.Diagnostics.ProcessStartInfo FilestartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
FilestartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
/*ffmpeg參數說明
* -i 1.avi 輸入文件
* -ab/-ac <比特率> 設定聲音比特率，前面-ac設爲立體聲時要以一半比特率來設置，比如192kbps的就設成96，轉換
均默認比特率都較小，要聽到較高品質聲音的話建議設到160kbps（80）以上
* -ar <採樣率> 設定聲音採樣率，PSP只認24000
* -b <比特率> 指定壓縮比特率，似乎ffmpeg是自動VBR的，指定了就大概是平均比特率，比如768，1500這樣的 --加了以後轉換不正常
* -r 29.97 楨速率（可以改，確認非標準楨率會導致音畫不同步，所以只能設定爲15或者29.97）
* s 320x240 指定分辨率
* 最後的路徑爲目標文件
*/
FilestartInfo.Arguments = " -i " + sourceFile + " -ab 80 -ar 22050 -r 29.97 -s " + videosize + " " + destFile;
//FilestartInfo.Arguments = "-y -i " + sourceFile + " -s 320x240 -vcodec h264 -qscale 4 -ar 24000 -f psp -muxvb 768 " + destFile;
try
{
//轉換
System.Diagnostics.Process.Start(FilestartInfo);
destVideo = destPath + filename;
}
catch
{
return "格式轉換失敗！";
}
//}
//格式不需要轉換則直接複製文件到目錄
//else
//{
// File.Copy(sourceFile, destFile,true);
// destVideo = destPath + filename;
//}
//提取視頻長度
if (getDuration)
{
VideoLength = GetVideoDuration(ffmpeg, sourceFile);
}
//提取圖片
if (createImage)
{
//定義進程
System.Diagnostics.ProcessStartInfo ImgstartInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
//截大圖
string imgpath = destPath + uniquename + ".jpg";// FileHelper.GetUniqueFileName(".jpg");
ConvertImage(sourceFile, imgpath, imgsize, ImgstartInfo);
//截小圖
imgpath = destPath + uniquename + "_thumb.jpg";
DestImage = ConvertImage(sourceFile, imgpath, "80*80", ImgstartInfo);
}
return "";
}
private string ConvertImage(string sourceFile, string imgpath, string imgsize, System.Diagnostics.ProcessStartInfo ImgstartInfo)
{
ImgstartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
/*參數設置
* -y（覆蓋輸出文件，即如果生成的文件（flv_img）已經存在的話，不經提示就覆蓋掉了）
* -i 1.avi 輸入文件
* -f image2 指定輸出格式
* -ss 8 後跟的單位爲秒，從指定時間點開始轉換任務
* -vframes
* -s 指定分辨率
*/
//duration: 00:00:00.00
string[] time = VideoLength.Split(':');
int seconds = int.Parse(time[0]) * 60 * 60 + int.Parse(time[1]) * 60 + int.Parse(time[2]);
int ss = seconds > 5 ? 5 : seconds - 1;
ImgstartInfo.Arguments = " -i " + sourceFile + " -y -f image2 -ss " + ss.ToString() + " -vframes 1 -s " + imgsize + " " + HttpContext.Current.Server.MapPath(imgpath);
try
{
System.Diagnostics.Process.Start(ImgstartInfo);
return imgpath;
}
catch
{
return "";
}
}
private string GetVideoDuration(string ffmpegfile, string sourceFile)
{
using (System.Diagnostics.Process ffmpeg = new System.Diagnostics.Process())
{
String duration; // soon will hold our video's duration in the form "HH:MM:SS.UU"
String result; // temp variable holding a string representation of our video's duration
StreamReader errorreader; // StringWriter to hold output from ffmpeg
// we want to execute the process without opening a shell
ffmpeg.StartInfo.UseShellExecute = false;
//ffmpeg.StartInfo.ErrorDialog = false;
ffmpeg.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
// redirect StandardError so we can parse it
// for some reason the output comes through over StandardError
ffmpeg.StartInfo.RedirectStandardError = true;
// set the file name of our process, including the full path
// (as well as quotes, as if you were calling it from the command-line)
ffmpeg.StartInfo.FileName = ffmpegfile;
// set the command-line arguments of our process, including full paths of any files
// (as well as quotes, as if you were passing these arguments on the command-line)
ffmpeg.StartInfo.Arguments = "-i " + sourceFile;
// start the process
ffmpeg.Start();
// now that the process is started, we can redirect output to the StreamReader we defined
errorreader = ffmpeg.StandardError;
// wait until ffmpeg comes back
ffmpeg.WaitForExit();
// read the output from ffmpeg, which for some reason is found in Process.StandardError
result = errorreader.ReadToEnd();
// a little convoluded, this string manipulation...
// working from the inside out, it:
// takes a substring of result, starting from the end of the "Duration: " label contained within,
// (execute "ffmpeg.exe -i somevideofile" on the command-line to verify for yourself that it is there)
// and going the full length of the timestamp
duration = result.Substring(result.IndexOf("Duration: ") + ("Duration: ").Length, ("00:00:00").Length);
return duration;
}
}
#endregion
}
}
