PlazaSharp/WinPlaza/MainWindow.xaml.cs

using System;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Timers;
using System.Windows;
using System.Windows.Media.Imaging;
using libplaza;
using ManagedBass;

namespace WinPlaza {
	public partial class MainWindow : Window {
		#region StateVars
		static readonly object BufferLock=new object();
		private int BuffCh;
		private int BufferReqs;
		private int MuteVol=-1;
		private int GfxWidthStep=-1;
		private string LastArtwork="";
		private Nightwave plaza=new Nightwave();
		private Timer tRefresh;
		private Timer tAudio;
		private Timer tGfx;
		private bool AudioInit=false;
		#endregion
		#region Delegates
		private delegate void dgtNoParam();
		private delegate void dgtBool(bool b);
		private delegate void dgtStr(string s);
		#endregion
		#region CrossThreadCalls
		private void Leveller() {
			if(GfxWidthStep<0)
				GfxWidthStep = 32768 / (int)chLeftCvs.ActualWidth;
			chLeft.Width = Bass.ChannelGetLevelLeft(BuffCh) / GfxWidthStep;
			chRight.Width = Bass.ChannelGetLevelRight(BuffCh) / GfxWidthStep;
		}
		private void SetStatus(string msg) =>
			Dispatcher.BeginInvoke(new dgtStr(_Status), msg);
		private void SetTitle(string msg) =>
			Dispatcher.BeginInvoke(new dgtStr(_Title), msg);
		private async void dgtRefresh(bool Force = false) {
			Nightwave.Status s=await plaza.Broadcast(Force);
			slDuration.Value = s.CalculatedElapsed;
			sbListeners.Text = $"{s.Listeners} listeners";
			lbLikeCt.Content = s.Likes;
			lbDislikeCt.Content = s.Dislikes;
			lbElapsed.Content = $"{(s.CalculatedElapsed / 60).ToString("D")}:{(s.CalculatedElapsed % 60).ToString("D2")}";
			if(LastArtwork != s.ArtworkUri||Force) {
				lbArtist.Content = s.Artist;
				lbTitle.Content = s.Title;
				lbAlbum.Content = s.Album;
				if(btPlayPause.IsChecked == true)
					SetTitle($"▶ {s.Title} - {s.Artist}");
				slDuration.Maximum = s.Duration;
				lbTime.Content = $"{(s.Duration / 60).ToString("D")}:{(s.Duration % 60).ToString("D2")}";
				if(LastArtwork != s.ArtworkUri)
					art.Source = new BitmapImage(new Uri(s.ArtworkUri));
				LastArtwork = s.ArtworkUri;
			}
		}
		private void dgtAud() {
			long progress = Bass.StreamGetFilePosition(BuffCh, FileStreamPosition.Buffer)
								* 100 / Bass.StreamGetFilePosition(BuffCh, FileStreamPosition.End);
			if(progress > 75 || Bass.StreamGetFilePosition(BuffCh, FileStreamPosition.Connected) == 0) {
				tAudio.Stop();
				//tbPlayPause.ImageSource = (BitmapImage)FindResource("tbPlaying");
				SetStatus("Playing");
				SetTitle($"▶ {lbTitle.Content} - {lbArtist.Content}");
				tGfx.Start();
				_ = Bass.ChannelSetSync(BuffCh, SyncFlags.MetadataReceived, 0, MetaSync);
				_ = Bass.ChannelSetSync(BuffCh, SyncFlags.OggChange, 0, MetaSync);
				_ = Bass.ChannelSetSync(BuffCh, SyncFlags.End, 0, EndSync);
				_ = Bass.ChannelPlay(BuffCh);
			} else
				SetStatus($"Buffering... {progress}%");
		}
		#endregion
		#region PlaybackControllers
		private void LoadUri(string uri) => Task.Factory.StartNew(() => {
			int r;
			lock(BufferLock)
				r = ++BufferReqs;
			tAudio.Stop();
			_ = Bass.StreamFree(BuffCh);
			SetStatus("Connecting stream..");
			int stream = Bass.CreateStream(uri, 0, BassFlags.StreamDownloadBlocks | BassFlags.StreamStatus | BassFlags.AutoFree, StatusProc, new IntPtr(r));
			lock(BufferLock) {
				if(r != BufferReqs) {
					if(stream != 0)
						_ = Bass.StreamFree(stream);
				}
				BuffCh = stream;
			}
			if(BuffCh == 0)
				SetStatus("Unable to connect to stream");
			else
				tAudio.Start();
		});
		private void PlazaLoad() => LoadUri("https://radio.plaza.one/ogg");
		private void PlazaStop() {
			tGfx.Stop();
			lock(BufferLock) {
				_ = Bass.StreamFree(BufferReqs);
				_ = Bass.StreamFree(BuffCh);
				_ = Bass.ChannelStop(BufferReqs);
				_ = Bass.ChannelStop(BuffCh);
				tAudio.Stop();
				//tbPlayPause.ImageSource = (BitmapImage)FindResource("tbStopped");
				SetStatus("Idle..");
				SetTitle("Nightwave.Net");
			}
		}
		#endregion
		#region EventHandlers
		private void EndSync(int hdl, int ch, int dat, IntPtr usr) {
			SetStatus("Idle..");
			SetTitle("Nightwave.Net");
		}
		private void MetaSync(int hdl, int ch, int dat, IntPtr usr) =>
			Dispatcher.BeginInvoke(new dgtBool(dgtRefresh), true);
		private void StatusProc(IntPtr buf, int len, IntPtr usr) {
			if(buf != IntPtr.Zero && len == 0 && usr.ToInt32() == BufferReqs)
				SetStatus(Marshal.PtrToStringAnsi(buf));
		}
		private void EvtRefresh(object sender, ElapsedEventArgs e) =>
			_ = Dispatcher.BeginInvoke(new dgtBool(dgtRefresh), false);
		private void EvtAudio(object sender, ElapsedEventArgs e) =>
			_ = Dispatcher.BeginInvoke(new dgtNoParam(dgtAud));
		private void EvtRender(object sender, ElapsedEventArgs e) =>
			Dispatcher.BeginInvoke(new dgtNoParam(Leveller));
		private void BtPlayPause_Click(object sender, RoutedEventArgs e) {
			if(!AudioInit)
				return;
			if(btPlayPause.IsChecked == true)
				_ = Dispatcher.BeginInvoke(new dgtNoParam(PlazaLoad));
			else
				_ = Dispatcher.BeginInvoke(new dgtNoParam(PlazaStop));
		}
		private void SbMute_Click(object sender, RoutedEventArgs e) {
			if(MuteVol<0) {
				MuteVol = Bass.GlobalStreamVolume;
				Bass.GlobalStreamVolume = 0;
				sbMute.Content = "🔇";
				tbMute.ImageSource = (BitmapImage)FindResource("tbMuted");
			} else {
				Bass.GlobalStreamVolume = MuteVol;
				MuteVol = -1;
				sbMute.Content = "🔊";
				tbMute.ImageSource = (BitmapImage)FindResource("tbAudible");
			}
		}
		private void SbVol_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e) {
			sbVol.Value += e.Delta / 25;
			e.Handled = true;
		}
		private void SbVol_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) =>
			Bass.GlobalStreamVolume = (int)sbVol.Value * 100;
		private void TbPlayPause_Click(object sender, EventArgs e) =>
			btPlayPause.IsChecked = !btPlayPause.IsChecked;
		private void TbMute_Click(object sender, EventArgs e) =>
			SbMute_Click(sender, new RoutedEventArgs());
		private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) {
			tRefresh.Stop();
			if(AudioInit) {
				tAudio.Stop();
				tGfx.Stop();
				PlazaStop();
			}
		}
		private void Window_Deactivated(object sender, EventArgs e) {
			if(tGfx.Enabled)
				tGfx.Interval = 1000.0 / 25.0;
		}
		private void Window_Activated(object sender, EventArgs e) {
			if(tGfx.Enabled)
				tGfx.Interval = 1000.0 / 60.0;
		}
		#endregion
		#region GUIMethods
		public MainWindow() {
			InitializeComponent();
			tRefresh = new Timer(300) { AutoReset = true };
			tRefresh.Elapsed += EvtRefresh;
			tRefresh.Start();
			if(!Bass.Init())
				sbStatus.Text = "Unable to initialise audio subsystem";
			else
				AudioInit = true;
			if(!AudioInit)
				return;
			tAudio = new Timer(50);
			tAudio.Elapsed += EvtAudio;
			tGfx = new Timer(16) { AutoReset = true };
			tGfx.Elapsed += EvtRender;
			Bass.NetPlaylist = 1;
			Bass.NetPreBuffer = 0;
		}
		~MainWindow() {
			if(AudioInit)
				_ = Bass.Free();
		}
		private void _Status(string s) => sbStatus.Text = s;
		private void _Title(string s) => Title = s;
		#endregion
	}
}