/// ------------------------------------------------------------------------------------
/// <summary>
/// Gets format values from the audio file, such as sample rate, sample size, etc.
/// </summary>
/// ------------------------------------------------------------------------------------
private void GetAudioFormatValues(string audioFilePath)
{
FileStream stream = null;
BinaryReader reader = null;
try
{
stream = File.Open(audioFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
reader = new BinaryReader(stream, Encoding.ASCII);
//Start at the beginning of fmt chunk plus advance eight
//positions to move ahead of the chunk ID and chunk size.
stream.Position = AudioReader.GetChunkOffset(stream, AudioReader.kidFmtChunk) + 8;
//Read the correct values that correspond with each category
//of the fmt chunk, then write the information to the database.
FormatTag = reader.ReadUInt16();
Channels = reader.ReadUInt16();
int samplesPerSecond = reader.ReadInt32();
SamplesPerSecond = samplesPerSecond;
AverageBytesPerSecond = reader.ReadInt32();
BlockAlignment = reader.ReadUInt16();
int bitsPerSample = reader.ReadUInt16();
BitsPerSample = bitsPerSample;
// Also set default record info
RecordFileFormat = 1; // This is for wave files
//Start at the beginning of data chunk plus advance
//four positions to move ahead of the chunk ID.
stream.Position = AudioReader.GetChunkOffset(stream, AudioReader.kidDataChunk) + 4;
//Read the data chunk size and write to the database.
int dataChunkSize = reader.ReadInt32();
DataChunkSize = dataChunkSize;
//Calculate number of samples
NumberOfSamples = 8 * dataChunkSize / bitsPerSample;
}
catch
{
}
finally
{
if (stream != null)
{
stream.Close();
}
stream = null;
reader = null;
}
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// Initializes an object to read SA data from the SA database.
/// </summary>
/// ------------------------------------------------------------------------------------
public bool Initialize(string audioFilePath, bool isForTmpOperation)
{
m_doc = SaAudioDocument.Load(audioFilePath, isForTmpOperation, true);
if (m_doc != null)
{
ResetSegmentEnumerators();
return(true);
}
try
{
using (var audioReader = new AudioReader())
{
var result = audioReader.Initialize(audioFilePath);
if (result == AudioReader.InitResult.FileNotFound)
{
ShowWaveFileNotFoundMsg(audioFilePath);
return(false);
}
if ((result == AudioReader.InitResult.InvalidFormat))
{
var msg = LocalizationManager.GetString("Miscellaneous.Messages.DataSourceReading.InvalidWaveFileMsg",
"The file '{0}' is not a valid wave file.");
Utils.MsgBox(string.Format(msg, Utils.PrepFilePathForMsgBox(audioFilePath)));
return(false);
}
// If audio file is old SA format, then tell user to use SA 3.0.1 to convert first.
if (audioReader.IsOldSaFormat)
{
if (m_worker != null)
{
m_worker.ReportProgress(-1);
}
var msg = LocalizationManager.GetString(
"Miscellaneous.Messages.DataSourceReading.AudioFileNeedsConversionMsg",
"It appears the audio file '{0}' may have been created using an old version " +
"of Speech Analyzer. In order for {1} to read data associated with this audio " +
"file it must first be converted using Speech Analyzer 3.0.1.");
msg = string.Format(msg, audioFilePath, Application.ProductName);
using (var dlg = new DownloadSaDlg(msg))
dlg.ShowDialog();
return(false);
}
// Now try reading the companion transcription file again.
m_doc = SaAudioDocument.Load(audioFilePath, isForTmpOperation, false);
ResetSegmentEnumerators();
}
}
catch (Exception e)
{
var msg = LocalizationManager.GetString(
"Miscellaneous.Messages.DataSourceReading.ErrorInitializingSaDocumentReaderMsg",
"Error initializing SA Document reader.");
ErrorReport.ReportNonFatalExceptionWithMessage(e, msg);
return(false);
}
return(true);
}
