public EncodingInfo Read(Stream raf)
{
EncodingInfo info = new EncodingInfo();
//Begin info fetch-------------------------------------------
if (raf.Length == 0)
{
//Empty File
throw new CannotReadException("File is empty");
}
raf.Seek(0, SeekOrigin.Begin);
//MP+ Header string
byte[] b = new byte[3];
raf.Read(b, 0, b.Length);
string mpc = new string(System.Text.Encoding.ASCII.GetChars(b));
if (mpc != "MP+" && mpc == "ID3")
{
//TODO Do we have to do this ??
//we have an ID3v2 tag at the beginning
//We quickly jump to MPC data
raf.Seek(6, SeekOrigin.Begin);
int tagSize = ReadSyncsafeInteger(raf);
raf.Seek(tagSize + 10, SeekOrigin.Begin);
//retry to read MPC stream
b = new byte[3];
raf.Read(b, 0, b.Length);
mpc = new string(System.Text.Encoding.ASCII.GetChars(b));
if (mpc != "MP+")
{
//We could definitely not go there
throw new CannotReadException("MP+ Header not found");
}
}
else if (mpc != "MP+")
{
throw new CannotReadException("MP+ Header not found");
}
b = new byte[25];
raf.Read(b, 0, b.Length);
MpcHeader mpcH = new MpcHeader(b);
//We only support v7 Stream format, so if it isn't v7, then returned values
//will be bogus, and the file will be ignored
double pcm = mpcH.SamplesNumber;
info.Duration = new TimeSpan((long)(pcm * 1152 / mpcH.SamplingRate) * TimeSpan.TicksPerSecond);
info.ChannelNumber = mpcH.ChannelNumber;
info.SamplingRate = mpcH.SamplingRate;
info.EncodingType = mpcH.EncodingType;
info.ExtraEncodingInfos = mpcH.EncoderInfo;
info.Bitrate = ComputeBitrate(info.Duration.Seconds, raf.Length);
return(info);
}
public EncodingInfo Read( Stream raf ) {
EncodingInfo info = new EncodingInfo();
//Begin info fetch-------------------------------------------
if ( raf.Length==0 ) {
//Empty File
throw new CannotReadException("File is empty");
}
raf.Seek( 0 , SeekOrigin.Begin);
//MP+ Header string
byte[] b = new byte[3];
raf.Read(b, 0, b.Length);
string mpc = new string(System.Text.Encoding.ASCII.GetChars(b));
if (mpc != "MP+" && mpc == "ID3") {
//TODO Do we have to do this ??
//we have an ID3v2 tag at the beginning
//We quickly jump to MPC data
raf.Seek(6, SeekOrigin.Begin);
int tagSize = ReadSyncsafeInteger(raf);
raf.Seek(tagSize+10, SeekOrigin.Begin);
//retry to read MPC stream
b = new byte[3];
raf.Read(b, 0, b.Length);
mpc = new string(System.Text.Encoding.ASCII.GetChars(b));
if (mpc != "MP+") {
//We could definitely not go there
throw new CannotReadException("MP+ Header not found");
}
} else if (mpc != "MP+"){
throw new CannotReadException("MP+ Header not found");
}
b = new byte[25];
raf.Read(b, 0, b.Length);
MpcHeader mpcH = new MpcHeader(b);
//We only support v7 Stream format, so if it isn't v7, then returned values
//will be bogus, and the file will be ignored
double pcm = mpcH.SamplesNumber;
info.Duration = new TimeSpan((long)(pcm * 1152 / mpcH.SamplingRate) * TimeSpan.TicksPerSecond);
info.ChannelNumber = mpcH.ChannelNumber;
info.SamplingRate = mpcH.SamplingRate;
info.EncodingType = mpcH.EncodingType;
info.ExtraEncodingInfos = mpcH.EncoderInfo;
info.Bitrate = ComputeBitrate( info.Duration.Seconds, raf.Length );
return info;
}
