public void WriteFile(PCM16Audio lwav, string output_dir, string original_filename_no_ext)
{
string output_filename = Path.Combine(output_dir, original_filename_no_ext + ".ogg");
// Don't re-encode if the original input file was also Ogg Vorbis
if (lwav.OriginalPath != null && new string[] { ".ogg", ".logg" }.Contains(Path.GetExtension(lwav.OriginalPath), StringComparer.InvariantCultureIgnoreCase))
{
File.Copy(lwav.OriginalPath, output_filename, true);
}
else
{
sox.WriteFile(lwav, output_filename, encodingParameters);
}
using (VorbisFile file = new VorbisFile(File.ReadAllBytes(output_filename))) {
var commentHeader = file.GetPageHeaders().Select(p => p.GetCommentHeader()).Where(h => h != null).FirstOrDefault();
var comments = commentHeader?.ExtractComments() ?? new VorbisComments();
if (lwav.Looping)
{
if (commentHeader == null)
{
throw new Exception("No comment header found in Ogg Vorbis file - cannot edit it to make it loop.");
}
string loopStart = null;
string loopLength = null;
comments.Comments.TryGetValue("LOOPSTART", out loopStart);
comments.Comments.TryGetValue("LOOPLENGTH", out loopLength);
if (loopStart != lwav.LoopStart.ToString() || loopLength != lwav.LoopLength.ToString())
{
comments.Comments["LOOPSTART"] = lwav.LoopStart.ToString();
comments.Comments["LOOPLENGTH"] = lwav.LoopLength.ToString();
using (VorbisFile newFile = new VorbisFile(file, comments)) {
File.WriteAllBytes(output_filename, newFile.ToByteArray());
}
}
}
else
{
if (comments.Comments.ContainsKey("LOOPSTART") || comments.Comments.ContainsKey("LOOPLENGTH"))
{
comments.Comments.Remove("LOOPSTART");
comments.Comments.Remove("LOOPLENGTH");
using (VorbisFile newFile = new VorbisFile(file, comments)) {
File.WriteAllBytes(output_filename, newFile.ToByteArray());
}
}
}
}
}
static void Main(string[] args)
{
byte[] b = File.ReadAllBytes(@"test.ogg");
using (VorbisFile file = new VorbisFile(b)) {
List <OggPage> pageHeaders = file.GetPageHeaders();
VorbisHeader commentHeader = null;
foreach (var pageHeader in pageHeaders)
{
commentHeader = pageHeader.GetCommentHeader();
if (commentHeader != null)
{
break;
}
}
if (commentHeader == null)
{
throw new Exception("comment header not found");
}
if (commentHeader.PacketType == 3)
{
var c = commentHeader.ExtractComments();
Console.WriteLine(c.Vendor);
Console.WriteLine(string.Join(", ", c.Comments.Select(p => p.Key + ": " + p.Value)));
c.Comments["LOOPSTART"] = "100000";
c.Comments["LOOPLENGTH"] = "150000";
using (VorbisFile newFile = new VorbisFile(file, c)) {
File.WriteAllBytes("out.ogg", newFile.ToByteArray());
}
}
}
}
