CheckSoundFormat(string inputFile)
{
// Verify existence of inputFilenm, throw
// exception if not exist
if (!System.IO.File.Exists(inputFile))
{
throw new FileNotFoundException(
"Cannot find file " + inputFile);
}
// Check for non-MP3 sound file
LibsndfileWrapper libSndFile = new LibsndfileWrapper();
LibsndfileWrapper.SF_INFO soundInfo =
new LibsndfileWrapper.SF_INFO();
int i = libSndFile.GetSoundFileType(inputFile, ref soundInfo);
// First check to see if it's an audio
// format !MP3. Then check for MP3.
// If no valid format found, throw
// exception.
if (soundInfo.format != 0)
{
return((soundFormat)soundInfo.format);
}
else
{
MP3Check verifyMP3 = new MP3Check(inputFile, 2);
if (!verifyMP3.Check())
{
throw new Exception("Cannot determine sound file type: " +
inputFile);
}
else
{
return(soundFormat.MP3);
}
}
}
Convert(string inputFile, string outputFile,
soundFormat convertTo, MadnpsrvWrapper.Callback updateStatus)
{
// Handle incorrect output types
if (!(convertTo == soundFormat.WAV) &&
!(convertTo == soundFormat.RAW))
{
throw new Exception(
"Cannot convert from MP3 to this format directly: " +
convertTo);
}
// Check that file is MP3
// Search through 1/2 of file
// before quitting
MP3Check verifyMP3 = new MP3Check(inputFile, 2);
if (!verifyMP3.Check())
{
throw new Exception("Not a valid MP3 file: " + inputFile);
}
// Create class instance
MadnpsrvWrapper madNPObject = new MadnpsrvWrapper();
// call the decoding function
if (convertTo == soundFormat.WAV)
{
// Startup pipe server:
madNPObject.StartPipe(inputFile,
outputFile, MadnpsrvWrapper.DEC_WAV);
}
else
// Convert to PCM (raw):
{
// Startup pipe server:
madNPObject.StartPipe(inputFile,
outputFile, MadnpsrvWrapper.DEC_PCM);
}
// Call read function (passing delegate
// function)
madNPObject.ReadPipe(updateStatus);
// Kill the pipe server,
// just in case it is still
// running
madNPObject.StopPipe();
}
Convert(string inputFile, string outputFile,
soundFormat convertTo, MadlldlibWrapper.Callback updateStatus)
{
// Handle incorrect output types
if (!(convertTo == soundFormat.WAV) &&
!(convertTo == soundFormat.RAW))
{
throw new Exception(
"Cannot convert from MP3 to this format directly: " +
convertTo);
}
// Check that file is MP3
// Search through .5 of file
// before quitting
MP3Check verifyMP3 = new MP3Check(inputFile, 2);
if (!verifyMP3.Check())
{
throw new Exception("Not a valid MP3 file: " +
inputFile);
}
// Convert to short pathnames
inputFilePath.Capacity = MAX_STRLEN;
outputFilePath.Capacity = MAX_STRLEN;
GetShortPathName(inputFile, inputFilePath, MAX_STRLEN);
GetShortPathName(outputFile, outputFilePath, MAX_STRLEN);
// Assign if returned path is not zero:
if (inputFilePath.Length > 0)
{
inputFile = inputFilePath.ToString();
}
if (outputFilePath.Length > 0)
{
outputFile = outputFilePath.ToString();
}
// status/error message reporting.
// String length must be set
// explicitly
StringBuilder status = new StringBuilder();
status.Capacity = 256;
// call the decoding function
if (convertTo == soundFormat.WAV)
{
MadlldlibWrapper.DecodeMP3(inputFile, outputFile,
MadlldlibWrapper.DEC_WAV, status, updateStatus);
}
else
// Convert to PCM (raw):
{
MadlldlibWrapper.DecodeMP3(inputFile, outputFile,
MadlldlibWrapper.DEC_PCM, status, updateStatus);
}
// this prevents garbage collection
// from occurring on callback
GC.KeepAlive(updateStatus);
}
