public static ASFHeader Read(ASFChunk chunk)
{
var streams = new List <StreamType>();
int bitrate = 0;
var s = new MemoryStream(chunk.Data, false);
ASFObject.ReadHeader(s); //root_obj
var sub_headers = BinaryReader.ReadUInt32LE(s);
s.Seek(2, SeekOrigin.Current); //2 bytes padding?
for (var i = 0; i < sub_headers; i++)
{
var obj = ASFObject.Read(s);
switch (obj.Type)
{
case ASFObject.KnownType.FileProperty: {
var objdata = new MemoryStream(obj.Data, false);
objdata.Seek(32, SeekOrigin.Current);
BinaryReader.ReadInt64LE(objdata); //packets
objdata.Seek(28, SeekOrigin.Current);
BinaryReader.ReadInt32LE(objdata); //packetsize_min
BinaryReader.ReadInt32LE(objdata); //packetsize_max
bitrate = (BinaryReader.ReadInt32LE(objdata) + 999) / 1000;
}
break;
case ASFObject.KnownType.StreamProperty: {
var objdata = new MemoryStream(obj.Data, false);
var stream_type = new Guid(BinaryReader.ReadBytes(objdata, 16));
if (stream_type == ASFObject.StreamIDAudio)
{
streams.Add(StreamType.Audio);
}
else if (stream_type == ASFObject.StreamIDVideo)
{
streams.Add(StreamType.Video);
}
else
{
streams.Add(StreamType.Unknown);
}
}
break;
default:
break;
}
}
return(new ASFHeader(bitrate, streams.ToArray()));
}
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 async Task ReadAsync(IContentSink sink, Stream stream, CancellationToken cancel_token)
{
int streamIndex = -1;
DateTime streamOrigin = DateTime.Now;
long contentPosition = 0;
bool eof = false;
do
{
ASFChunk chunk = null;
try {
chunk = await ASFChunk.ReadAsync(stream, cancel_token).ConfigureAwait(false);
}
catch (EndOfStreamException) {
eof = true;
continue;
}
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");
}
sink.OnChannelInfo(new ChannelInfo(info));
streamIndex = Channel.GenerateStreamID();
streamOrigin = DateTime.Now;
contentPosition = 0;
var data = chunk.ToByteArray();
sink.OnContentHeader(new Content(streamIndex, TimeSpan.Zero, contentPosition, data, PCPChanPacketContinuation.None));
contentPosition += data.Length;
break;
}
case ASFChunk.ChunkType.Data:
{
var data = chunk.ToByteArray();
sink.OnContent(
new Content(streamIndex, DateTime.Now - streamOrigin, contentPosition, chunk.ToByteArray(), PCPChanPacketContinuation.None)
);
contentPosition += data.Length;
}
break;
case ASFChunk.ChunkType.Unknown:
break;
}
} while (!eof);
}
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);
}
public static ASFHeader Read(ASFChunk chunk)
{
var streams = new List<StreamType>();
int bitrate = 0;
var s = new MemoryStream(chunk.Data, false);
ASFObject.ReadHeader(s); //root_obj
var sub_headers = BinaryReader.ReadUInt32LE(s);
s.Seek(2, SeekOrigin.Current); //2 bytes padding?
for (var i=0; i<sub_headers; i++) {
var obj = ASFObject.Read(s);
switch (obj.Type) {
case ASFObject.KnownType.FileProperty: {
var objdata = new MemoryStream(obj.Data, false);
objdata.Seek(32, SeekOrigin.Current);
BinaryReader.ReadInt64LE(objdata); //packets
objdata.Seek(28, SeekOrigin.Current);
BinaryReader.ReadInt32LE(objdata); //packetsize_min
BinaryReader.ReadInt32LE(objdata); //packetsize_max
bitrate = (BinaryReader.ReadInt32LE(objdata)+999) / 1000;
}
break;
case ASFObject.KnownType.StreamProperty: {
var objdata = new MemoryStream(obj.Data, false);
var stream_type = new Guid(BinaryReader.ReadBytes(objdata, 16));
if (stream_type==ASFObject.StreamIDAudio) {
streams.Add(StreamType.Audio);
}
else if (stream_type==ASFObject.StreamIDVideo) {
streams.Add(StreamType.Video);
}
else {
streams.Add(StreamType.Unknown);
}
}
break;
default:
break;
}
}
return new ASFHeader(bitrate, streams.ToArray());
}
