/// <summary>
/// construct audio file
/// passing in audio size and id3 length tag (if any) to help with bitrate calculations
/// </summary>
/// <param name="sourceBuffer"></param>
/// <param name="id3DurationTag"></param>
public AudioBuffer(byte[] sourceBuffer, TimeSpan?id3DurationTag)
:
base(AudioFrameFactory.CreateFrame(sourceBuffer), id3DurationTag)
{
_sourceBuffer = sourceBuffer;
CheckConsistency();
}
private static AudioFrame ReadFirstFrame(FileInfo sourceFileInfo, UInt32 audioStart, UInt32 audioNumBytes)
{
using (FileStream stream = sourceFileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Write))
{
stream.Seek(audioStart, SeekOrigin.Begin);
// read a base level mp3 frame header
// if it can't even do that right, just fail the call.
return(AudioFrameFactory.CreateFrame(stream, audioNumBytes));
}
}
/// <summary>
/// Count frames and bytes of file to see who's telling porkies
/// </summary>
public void ScanWholeFile()
{
_audioStats._numFrames = 0;
_audioStats._numBytes = 0;
using (Stream stream = OpenAudioStream())
{
uint payloadStart = (uint)stream.Position;
try
{
while (true)
{
uint pos = (uint)stream.Position;
uint used = pos - payloadStart;
uint remainingBytes = NumPayloadBytes - used;
AudioFrame frame = AudioFrameFactory.CreateFrame(stream, remainingBytes);
if (frame == null)
{
break;
}
++_audioStats._numFrames;
_audioStats._numBytes += frame.FrameLengthInBytes;
//Trace.WriteLine(string.Format("frame {0} ({1} bytes) found at {2}",
// _audioStats._numFrames,
// frame.Header.FrameLengthInBytes,
// stream.Position - frame.Header.FrameLengthInBytes));
}
}
catch (Exception e)
{
_hasInconsistencies = true;
Trace.WriteLine(e.Message);
}
}
}
