public static async Task <ParseResult <Mp3File> > ParseFullMetadataAsync(IBinaryStream stream)
{
var streamLength = await stream.GetLengthAsync().ConfigureAwait(false);
stream.Position = 0;
var file = new Mp3File();
var id3v2 = await Id3v2.IsPointingToHeaderAsync(stream).ConfigureAwait(false) ? await Id3v2.ParseAsync(stream).ConfigureAwait(false) : null;
var collectSamplesResult = await CollectSamplesAsync(stream, streamLength, 1).ConfigureAwait(false);
if (collectSamplesResult.Item1.Count == 0)
{
file.Metadata = new Mp3Metadata(id3v2);
return(ParseResult <Mp3File> .Create(file));
}
else
{
var firstFrame = collectSamplesResult.Item1[0];
var contentLength = streamLength - stream.Position;
if (collectSamplesResult.Item2 == BitrateType.Constant)
{
var duration = TimeSpan.FromSeconds(Math.Ceiling((contentLength / firstFrame.Length) * firstFrame.Duration.TotalSeconds));
var bitrate = firstFrame.Bitrate;
file.Metadata = new Mp3Metadata(id3v2, bitrate, duration);
}
else
{
var xingFrame = await XingFrame.CreateAsync(stream, firstFrame).ConfigureAwait(false);
if (xingFrame.FramesCount.HasValue)
{
var duration = TimeSpan.FromSeconds(xingFrame.FramesCount.Value * firstFrame.SamplesCount / firstFrame.Frequency);
var averageBitrate = (UInt32)(contentLength / duration.TotalSeconds) * 8;
file.Metadata = new Mp3Metadata(id3v2, averageBitrate, duration);
}
else
{
collectSamplesResult = await CollectSamplesAsync(stream, streamLength, null).ConfigureAwait(false);
file.Metadata = new Mp3Metadata(id3v2, collectSamplesResult.Item4, collectSamplesResult.Item3);
}
}
return(ParseResult <Mp3File> .Create(file));
}
}
public static async Task <ParseResult <Mp3File> > ParseSamplesAsync(IBinaryStream stream)
{
var streamLength = await stream.GetLengthAsync().ConfigureAwait(false);
stream.Position = 0;
if (await Id3v2.IsPointingToHeaderAsync(stream).ConfigureAwait(false))
{
await Id3v2.SkipAsync(stream).ConfigureAwait(false);
}
var collectSamplesResult = await CollectSamplesAsync(stream, streamLength, null).ConfigureAwait(false);
if (collectSamplesResult.Item1.Count == 0)
{
return(ParseResult <Mp3File> .CreateUnknownFormat());
}
var file = new Mp3File();
file.Type = collectSamplesResult.Item2;
file.Samples = collectSamplesResult.Item1;
return(ParseResult <Mp3File> .Create(file));
}
