public Waveform CreateWaveform()
{
using (var fs = new FileStream(Path, FileMode.Open, FileAccess.Read))
using (var reader = new BinaryReader(fs))
{
_header = ReadHeaderData(reader);
//TODO: Find out why we want the ratio to be 80 when conditions are met.
SampleRatio = _header.Channels == 2 ? 40 : 80;
var sampleData = ReadSampleData(reader);
return new Waveform(_header, new List<short>(sampleData), SampleRatio);
}
}
private Header ReadHeaderData(BinaryReader r)
{
var header = new Header();
var riffFileDescriptor = r.ReadChars(4);
ValidateHeaderData(riffFileDescriptor, Header.RiffFileDescriptor);
header.FileSize = r.ReadUInt32();
var fileTypeHeader = r.ReadChars(4);
ValidateHeaderData(fileTypeHeader, Header.FileTypeHeader);
var formatChunkMarker = r.ReadChars(4);
ValidateHeaderData(formatChunkMarker, Header.FormatChunkMarker);
uint formatChunkSize = r.ReadUInt32();
ushort audioFormat = r.ReadUInt16();
if (audioFormat != Header.AudioFormat)
throw new InvalidDataException("Audio format is incorrect: " + audioFormat);
header.Channels = r.ReadUInt16();
header.SampleRate = r.ReadUInt32();
header.ByteRate = r.ReadUInt32();
header.BlockAlign = r.ReadUInt16();
header.BitsPerSample = r.ReadUInt16();
/* There is a chance that the wave file will have a few extra bytes in its header. If
* it does, then calculate how many and skip over them.
*/
int extaFormatBytes = (Header.DefaultFormatChunkSize < formatChunkSize)
? (int)(formatChunkSize - Header.DefaultFormatChunkSize)
: 0;
r.ReadBytes(extaFormatBytes);
var dataChunkMarker = r.ReadChars(4);
ValidateHeaderData(dataChunkMarker, Header.DataChunkMarker);
header.DataSize = r.ReadUInt32();
if (r.BaseStream.Position != Header.DefaultHeaderByteSize + extaFormatBytes)
throw new InvalidDataException("Stream is at the wrong position");
return header;
}
/// <summary>
/// Writes the header for the WAV file that the waveform data was sampled from.
/// </summary>
/// <param name="project"></param>
/// <param name="header"></param>
public static void WriteWaveFormHeader(Project project, Header header)
{
Log.Info("Saving waveform header file to " + project.Files.WaveFormHeader);
using (var file = File.Open(project.Files.WaveFormHeader, FileMode.Create, FileAccess.Write))
{
var bin = new BinaryFormatter();
bin.Serialize(file, header);
}
Log.Info("Waveform header file saved successfully");
}
public Waveform(Header h, List<short> d)
{
Header = h;
Data = d;
}
private Waveform(Header header, List<short> d)
{
Header = header;
Data = d;
}
public Waveform(Header header, List<short> data, int sampleRatio)
: this(header, data)
{
SampleRatio = sampleRatio;
}
public AudioUtility(Project p)
{
_videoFile = p.Files.Video;
_audioFile = Path.Combine(p.Folders.Cache, Path.GetFileNameWithoutExtension(_videoFile) + ".wav");
_header = new Header();
}