public bool TryParseContentType(byte[] header_bytes, out string content_type, out string mime_type)
{
using (var stream = new MemoryStream(header_bytes)) {
try {
for (var chunks = 0; chunks < 8; chunks++)
{
var chunk = ASFChunk.Read(stream);
if (chunk.KnownType != ASFChunk.ChunkType.Header)
{
continue;
}
var header = ASFHeader.Read(chunk);
if (header.Streams.Any(type => type == ASFHeader.StreamType.Video))
{
content_type = "WMV";
mime_type = "video/x-ms-wmv";
}
else if (header.Streams.Any(type => type == ASFHeader.StreamType.Audio))
{
content_type = "WMA";
mime_type = "audio/x-ms-wma";
}
else
{
content_type = "ASF";
mime_type = "video/x-ms-asf";
}
return(true);
}
}
catch (EndOfStreamException) {
}
}
content_type = null;
mime_type = null;
return(false);
}
public ParsedContent Read(Stream stream)
{
var chunks = 0;
var res = new ParsedContent();
var pos = Channel.ContentPosition;
try {
while (chunks < 8)
{
var chunk = ASFChunk.Read(stream);
chunks++;
switch (chunk.KnownType)
{
case ASFChunk.ChunkType.Header: {
var header = ASFHeader.Read(chunk);
var info = new AtomCollection(Channel.ChannelInfo.Extra);
info.SetChanInfoBitrate(header.Bitrate);
if (header.Streams.Any(type => type == ASFHeader.StreamType.Video))
{
info.SetChanInfoType("WMV");
info.SetChanInfoStreamType("video/x-ms-wmv");
info.SetChanInfoStreamExt(".wmv");
}
else if (header.Streams.Any(type => type == ASFHeader.StreamType.Audio))
{
info.SetChanInfoType("WMA");
info.SetChanInfoStreamType("audio/x-ms-wma");
info.SetChanInfoStreamExt(".wma");
}
else
{
info.SetChanInfoType("ASF");
info.SetChanInfoStreamType("video/x-ms-asf");
info.SetChanInfoStreamExt(".asf");
}
res.ChannelInfo = new ChannelInfo(info);
res.ContentHeader = new Content(pos, chunk.ToByteArray());
pos += chunk.TotalLength;
}
break;
case ASFChunk.ChunkType.Data:
if (res.Contents == null)
{
res.Contents = new System.Collections.Generic.List <Content>();
}
res.Contents.Add(new Content(pos, chunk.ToByteArray()));
pos += chunk.TotalLength;
break;
case ASFChunk.ChunkType.Unknown:
break;
}
}
}
catch (EndOfStreamException) {
if (chunks == 0)
{
throw;
}
}
return(res);
}