iOS with monotouch upload wav file fails - ios

Question

I'm writing an iOS app with monotouch.
I'm recording a sound file via the AVrecorder. I create a working wav file(which I check).
I want to send it to my server by passing it as a byte array (seems to be the best way)
The problem is that the file passed to the server is corrupted.
This is how I convert wav to byte []. Any ideas what I'm doing wrong?
(I iterate to find the files size once and than copy everything. The reason I do this is that the GetProperty returns a wrong size of file).
string path = GlobalData.UserDefaults.StringForKey(GlobalData.HeykuSoundPathDefault);
AudioFile song = AudioFile.Open(path,AudioFilePermission.Read,AudioFileType.WAVE);
byte [] audioBuffer = new byte[4000000];
int copied = 0;
int offset = 0;
while(true)
{
copied = song.Read(offset,audioBuffer,0,4096,false);
if(copied == -1)
{
break;
}
else
{
offset += copied;
Console.WriteLine(offset);
}
}
audioBuffer = new byte[offset];
copied = song.Read(0,audioBuffer,0,offset,false);

Answer 1

Have you tried simply using streams? Something like this:
using (var fileReader = new StreamReader("filename_here"))
{
using (var webStream = webClient.OpenWrite("http://www.myuploader.com"))
{
fileReader.BaseStream.CopyToAsync(webStream);
}
}
The above method should copy the whole file including the Wave headers. I suspect the AudioFile could be returning you pure PCM audio which will not include headers. This is an example of a header writer function:
private void WriteHeader()
{
this.writer.Seek(0, SeekOrigin.Begin);
// chunk ID
this.writer.Write('R');
this.writer.Write('I');
this.writer.Write('F');
this.writer.Write('F');
this.writer.Write(this.ByteCount);
this.writer.Write('W');
this.writer.Write('A');
this.writer.Write('V');
this.writer.Write('E');
this.writer.Write('f');
this.writer.Write('m');
this.writer.Write('t');
this.writer.Write(' ');
this.writer.Write((int)16);
this.writer.Write((short)1);
this.writer.Write((short)this.ChannelCount);
this.writer.Write((int)this.SampleRate);
this.writer.Write((int)this.SampleRate*2);
this.writer.Write((short)2);
this.writer.Write((short)this.BitsPerSample);
this.writer.Write('d');
this.writer.Write('a');
this.writer.Write('t');
this.writer.Write('a');
this.writer.Write((int)this.byteCount);
}
More info on the file format: https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
As for reading the data from the AudioFile, this would probably work better:
var song = AudioFile.Open(path,AudioFilePermission.Read,AudioFileType.WAVE);
var audioBuffer = new byte[song.Length];
int copied = 0;
while (copied < audioBuffer.Length)
{
copied += song.Read (copied, audioBuffer, copied, 4096, false);
}