In the uncompressed situation I know I need to read the wav header, pull out the number of channels, bits, and sample rate and work it out from there: (channels) * (bits) * (samples/s) * (seconds) = (filesize)
Is there a simpler way - a free library, or something in the .net framework perhaps?
How would I do this if the .wav file is compressed (with the mpeg codec for example)?
Download NAudio.dll from the link https://www.dll-files.com/naudio.dll.html
and then use this function
public static TimeSpan GetWavFileDuration(string fileName)
{
WaveFileReader wf = new WaveFileReader(fileName);
return wf.TotalTime;
}
you will get the Duration
You may consider using the mciSendString(...) function (error checking is omitted for clarity):
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace Sound
{
public static class SoundInfo
{
[DllImport("winmm.dll")]
private static extern uint mciSendString(
string command,
StringBuilder returnValue,
int returnLength,
IntPtr winHandle);
public static int GetSoundLength(string fileName)
{
StringBuilder lengthBuf = new StringBuilder(32);
mciSendString(string.Format("open \"{0}\" type waveaudio alias wave", fileName), null, 0, IntPtr.Zero);
mciSendString("status wave length", lengthBuf, lengthBuf.Capacity, IntPtr.Zero);
mciSendString("close wave", null, 0, IntPtr.Zero);
int length = 0;
int.TryParse(lengthBuf.ToString(), out length);
return length;
}
}
}
I had difficulties with the example of the MediaPlayer-class above. It could take some time, before the player has opened the file. In the "real world" you have to register for the MediaOpened-event, after that has fired, the NaturalDuration is valid. In a console-app you just have to wait a few seconds after the open.
using System;
using System.Text;
using System.Windows.Media;
using System.Windows;
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
if (args.Length == 0)
return;
Console.Write(args[0] + ": ");
MediaPlayer player = new MediaPlayer();
Uri path = new Uri(args[0]);
player.Open(path);
TimeSpan maxWaitTime = TimeSpan.FromSeconds(10);
DateTime end = DateTime.Now + maxWaitTime;
while (DateTime.Now < end)
{
System.Threading.Thread.Sleep(100);
Duration duration = player.NaturalDuration;
if (duration.HasTimeSpan)
{
Console.WriteLine(duration.TimeSpan.ToString());
break;
}
}
player.Close();
}
}
}
Not to take anything away from the answer already accepted, but I was able to get the duration of an audio file (several different formats, including AC3, which is what I needed at the time) using the Microsoft.DirectX.AudioVideoPlayBack namespace. This is part of DirectX 9.0 for Managed Code. Adding a reference to that made my code as simple as this...
Public Shared Function GetDuration(ByVal Path As String) As Integer
If File.Exists(Path) Then
Return CInt(New Audio(Path, False).Duration)
Else
Throw New FileNotFoundException("Audio File Not Found: " & Path)
End If
End Function
And it's pretty fast, too! Here's a reference for the Audio class.
Yes, There is a free library that can be used to get time duration of Audio file. This library also provides many more functionalities.
TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL).
I implemented below code that returns time duration in seconds.
using TagLib.Mpeg;
public static double GetSoundLength(string FilePath)
{
AudioFile ObjAF = new AudioFile(FilePath);
return ObjAF.Properties.Duration.TotalSeconds;
}
In the .net framework there is a mediaplayer class:
http://msdn.microsoft.com/en-us/library/system.windows.media.mediaplayer_members.aspx
Here is an example:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2667714&SiteID=1&pageid=0#2685871
Try code below from How to determine the length of a .wav file in C#
string path = @"c:\test.wav";
WaveReader wr = new WaveReader(File.OpenRead(path));
int durationInMS = wr.GetDurationInMS();
wr.Close();
i have tested blew code would fail,file formats are like "\\ip\dir\*.wav'
public static class SoundInfo
{
[DllImport("winmm.dll")]
private static extern uint mciSendString
(
string command,
StringBuilder returnValue,
int returnLength,
IntPtr winHandle
);
public static int GetSoundLength(string fileName)
{
StringBuilder lengthBuf = new StringBuilder(32);
mciSendString(string.Format("open \"{0}\" type waveaudio alias wave", fileName), null, 0, IntPtr.Zero);
mciSendString("status wave length", lengthBuf, lengthBuf.Capacity, IntPtr.Zero);
mciSendString("close wave", null, 0, IntPtr.Zero);
int length = 0;
int.TryParse(lengthBuf.ToString(), out length);
return length;
}
}
while naudio works
public static int GetSoundLength(string fileName)
{
using (WaveFileReader wf = new WaveFileReader(fileName))
{
return (int)wf.TotalTime.TotalMilliseconds;
}
}`
You might find that the XNA library has some support for working with WAV's etc. if you are willing to go down that route. It is designed to work with C# for game programming, so might just take care of what you need.
There's a bit of a tutorial (with - presumably - working code you can leverage) over at CodeProject.
The only thing you have to be a little careful of is that it's perfectly "normal" for a WAV file to be composed of multiple chunks - so you have to scoot over the entire file to ensure that all chunks are accounted for.
What exactly is your application doing with compressed WAVs? Compressed WAV files are always tricky - I always try and use an alternative container format in this case such as OGG or WMA files. The XNA libraries tend to be designed to work with specific formats - although it is possible that within XACT you'll find a more generic wav playback method. A possible alternative is to look into the SDL C# port, although I've only ever used it to play uncompressed WAVs - once opened you can query the number of samples to determine the length.
I'm gonna have to say MediaInfo, I have been using it for over a year with a audio/video encoding application I'm working on. It gives all the information for wav files along with almost every other format.
MediaInfoDll Comes with sample C# code on how to get it working.
I'm going to assume that you're somewhat familiar with the structure of a .WAV file : it contains a WAVEFORMATEX header struct, followed by a number of other structs (or "chunks") containing various kinds of information. See Wikipedia for more info on the file format.
First, iterate through the .wav file and add up the the unpadded lengths of the "data" chunks (the "data" chunk contains the audio data for the file; usually there is only one of these, but it's possible that there could be more than one). You now have the total size, in bytes, of the audio data.
Next, get the "average bytes per second" member of the WAVEFORMATEX header struct of the file.
Finally, divide the total size of the audio data by the average bytes per second - this will give you the duration of the file, in seconds.
This works reasonably well for uncompressed and compressed files.
time = FileLength / (Sample Rate * Channels * Bits per sample /8)
Imports System.IO
Imports System.Text
Imports System.Math
Imports System.BitConverter
Public Class PulseCodeModulation
' Pulse Code Modulation WAV (RIFF) file layout
' Header chunk
' Type Byte Offset Description
' Dword 0 Always ASCII "RIFF"
' Dword 4 Number of bytes in the file after this value (= File Size - 8)
' Dword 8 Always ASCII "WAVE"
' Format Chunk
' Type Byte Offset Description
' Dword 12 Always ASCII "fmt "
' Dword 16 Number of bytes in this chunk after this value
' Word 20 Data format PCM = 1 (i.e. Linear quantization)
' Word 22 Channels Mono = 1, Stereo = 2
' Dword 24 Sample Rate per second e.g. 8000, 44100
' Dword 28 Byte Rate per second (= Sample Rate * Channels * (Bits Per Sample / 8))
' Word 32 Block Align (= Channels * (Bits Per Sample / 8))
' Word 34 Bits Per Sample e.g. 8, 16
' Data Chunk
' Type Byte Offset Description
' Dword 36 Always ASCII "data"
' Dword 40 The number of bytes of sound data (Samples * Channels * (Bits Per Sample / 8))
' Buffer 44 The sound data
Dim HeaderData(43) As Byte
Private AudioFileReference As String
Public Sub New(ByVal AudioFileReference As String)
Try
Me.HeaderData = Read(AudioFileReference, 0, Me.HeaderData.Length)
Catch Exception As Exception
Throw
End Try
'Validate file format
Dim Encoder As New UTF8Encoding()
If "RIFF" <> Encoder.GetString(BlockCopy(Me.HeaderData, 0, 4)) Or _
"WAVE" <> Encoder.GetString(BlockCopy(Me.HeaderData, 8, 4)) Or _
"fmt " <> Encoder.GetString(BlockCopy(Me.HeaderData, 12, 4)) Or _
"data" <> Encoder.GetString(BlockCopy(Me.HeaderData, 36, 4)) Or _
16 <> ToUInt32(BlockCopy(Me.HeaderData, 16, 4), 0) Or _
1 <> ToUInt16(BlockCopy(Me.HeaderData, 20, 2), 0) _
Then
Throw New InvalidDataException("Invalid PCM WAV file")
End If
Me.AudioFileReference = AudioFileReference
End Sub
ReadOnly Property Channels() As Integer
Get
Return ToUInt16(BlockCopy(Me.HeaderData, 22, 2), 0) 'mono = 1, stereo = 2
End Get
End Property
ReadOnly Property SampleRate() As Integer
Get
Return ToUInt32(BlockCopy(Me.HeaderData, 24, 4), 0) 'per second
End Get
End Property
ReadOnly Property ByteRate() As Integer
Get
Return ToUInt32(BlockCopy(Me.HeaderData, 28, 4), 0) 'sample rate * channels * (bits per channel / 8)
End Get
End Property
ReadOnly Property BlockAlign() As Integer
Get
Return ToUInt16(BlockCopy(Me.HeaderData, 32, 2), 0) 'channels * (bits per sample / 8)
End Get
End Property
ReadOnly Property BitsPerSample() As Integer
Get
Return ToUInt16(BlockCopy(Me.HeaderData, 34, 2), 0)
End Get
End Property
ReadOnly Property Duration() As Integer
Get
Dim Size As Double = ToUInt32(BlockCopy(Me.HeaderData, 40, 4), 0)
Dim ByteRate As Double = ToUInt32(BlockCopy(Me.HeaderData, 28, 4), 0)
Return Ceiling(Size / ByteRate)
End Get
End Property
Public Sub Play()
Try
My.Computer.Audio.Play(Me.AudioFileReference, AudioPlayMode.Background)
Catch Exception As Exception
Throw
End Try
End Sub
Public Sub Play(playMode As AudioPlayMode)
Try
My.Computer.Audio.Play(Me.AudioFileReference, playMode)
Catch Exception As Exception
Throw
End Try
End Sub
Private Function Read(AudioFileReference As String, ByVal Offset As Long, ByVal Bytes As Long) As Byte()
Dim inputFile As System.IO.FileStream
Try
inputFile = IO.File.Open(AudioFileReference, IO.FileMode.Open)
Catch Exception As FileNotFoundException
Throw New FileNotFoundException("PCM WAV file not found")
Catch Exception As Exception
Throw
End Try
Dim BytesRead As Long
Dim Buffer(Bytes - 1) As Byte
Try
BytesRead = inputFile.Read(Buffer, Offset, Bytes)
Catch Exception As Exception
Throw
Finally
Try
inputFile.Close()
Catch Exception As Exception
'Eat the second exception so as to not mask the previous exception
End Try
End Try
If BytesRead < Bytes Then
Throw New InvalidDataException("PCM WAV file read failed")
End If
Return Buffer
End Function
Private Function BlockCopy(ByRef Source As Byte(), ByVal Offset As Long, ByVal Bytes As Long) As Byte()
Dim Destination(Bytes - 1) As Byte
Try
Buffer.BlockCopy(Source, Offset, Destination, 0, Bytes)
Catch Exception As Exception
Throw
End Try
Return Destination
End Function
End Class