/// <summary>
/// takes wav file / mp3 file as input and converts it to wav file with audio format info supplied as parameter
/// </summary>
/// <param name="SourceFilePath"></param>
/// <param name="destinationDirectory"></param>
/// <param name="destinationFormatInfo"></param>
/// <returns> full file path of converted file </returns>
private string ConvertToDefaultFormat(string SourceFilePath, string destinationDirectory, PCMFormatInfo destinationFormatInfo, bool skipACM)
{
if (!File.Exists(SourceFilePath))
{
throw new FileNotFoundException(SourceFilePath);
}
if (!Directory.Exists(destinationDirectory))
{
FileDataProvider.CreateDirectory(destinationDirectory);
}
AudioFileType sourceFileType = GetAudioFileType(SourceFilePath);
switch (sourceFileType)
{
case AudioFileType.WavUncompressed:
case AudioFileType.WavCompressed:
{
if (FirstDiscoveredPCMFormat == null)
{
Stream wavStream = null;
try
{
wavStream = File.Open(SourceFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
uint dataLength;
AudioLibPCMFormat pcmInfo = null;
pcmInfo = AudioLibPCMFormat.RiffHeaderParse(wavStream, out dataLength);
//FirstDiscoveredPCMFormat = new PCMFormatInfo(pcmInfo);
FirstDiscoveredPCMFormat = new AudioLibPCMFormat();
FirstDiscoveredPCMFormat.CopyFrom(pcmInfo);
}
finally
{
if (wavStream != null)
{
wavStream.Close();
}
}
}
WavFormatConverter formatConverter1 = new WavFormatConverter(true, skipACM);
AddSubCancellable(formatConverter1);
// Preserve existing WAV PCM format, the call below to ConvertSampleRate detects the equality of PCM formats and copies the audio file instead of resampling.
AudioLibPCMFormat pcmFormat = m_autoDetectPcmFormat ? FirstDiscoveredPCMFormat :
(destinationFormatInfo != null ? destinationFormatInfo.Data : new AudioLibPCMFormat());
string result = null;
try
{
AudioLibPCMFormat originalPcmFormat;
result = formatConverter1.ConvertSampleRate(SourceFilePath, destinationDirectory,
pcmFormat,
out originalPcmFormat);
if (originalPcmFormat != null && FirstDiscoveredPCMFormat != null)
{
DebugFix.Assert(FirstDiscoveredPCMFormat.Equals(originalPcmFormat));
}
}
finally
{
RemoveSubCancellable(formatConverter1);
}
return(result);
}
case AudioFileType.Mp4_AAC:
case AudioFileType.Mp3:
{
WavFormatConverter formatConverter2 = new WavFormatConverter(true, skipACM);
AddSubCancellable(formatConverter2);
string result = null;
try
{
AudioLibPCMFormat pcmFormat = m_autoDetectPcmFormat ? FirstDiscoveredPCMFormat : // can be null!
(destinationFormatInfo != null ? destinationFormatInfo.Data : new AudioLibPCMFormat());
AudioLibPCMFormat originalPcmFormat;
if (sourceFileType == AudioFileType.Mp3)
{
result = formatConverter2.UnCompressMp3File(SourceFilePath, destinationDirectory,
pcmFormat,
out originalPcmFormat);
}
else
{
DebugFix.Assert(sourceFileType == AudioFileType.Mp4_AAC);
result = formatConverter2.UnCompressMp4_AACFile(SourceFilePath, destinationDirectory,
pcmFormat,
out originalPcmFormat);
}
if (originalPcmFormat != null)
{
if (FirstDiscoveredPCMFormat == null)
{
//FirstDiscoveredPCMFormat = new PCMFormatInfo(originalPcmFormat);
FirstDiscoveredPCMFormat = new AudioLibPCMFormat();
FirstDiscoveredPCMFormat.CopyFrom(originalPcmFormat);
}
}
}
finally
{
RemoveSubCancellable(formatConverter2);
}
return(result);
}
default:
throw new Exception("Source file format not supported");
}
}