private async Task <IEnumerable <Channel> > ScanChannel(int channelId, ControlClient client)
{
await Task.Yield();
var frequency = ChannelMapper.GetFrequency(channelId);
if (frequency == null)
{
return(Enumerable.Empty <Channel>());
}
Console.WriteLine($"Scanning {client.Host}:{client.Port} tuner {client.Tuner} for channel {channelId} ({frequency:#.00}Mhz)...");
await client.SetFrequency(frequency.Value);
var token = new CancellationTokenSource(TimeSpan.FromSeconds(5));
while (true)
{
if (token.IsCancellationRequested)
{
return(Enumerable.Empty <Channel>());
}
var status = await client.GetStatus();
if (status.Modulation == CommandValues.None)
{
continue;
}
break;
}
token = new CancellationTokenSource(TimeSpan.FromSeconds(10));
while (true)
{
var info = await client.GetStreamInfo();
if (!token.IsCancellationRequested && (info.Channels.Count == 0 || info.IsWaitingForData))
{
continue;
}
var results = info.Channels
.Where(c => !c.IsEncrypted && !c.IsControl && !c.IsNoData && !string.IsNullOrEmpty(c.DisplayChannel))
.Select(c => new Channel(channelId, frequency.Value, c.Program, c.DisplayChannel, c.Name))
.ToList();
if (results.Any())
{
Console.WriteLine($"Found {results.Count} virtual channels on {client.Host}:{client.Port} tuner {client.Tuner} for channel {channelId} ({frequency:#.00}Mhz).");
}
return(results);
}
}