126 lines
3.6 KiB
C#
126 lines
3.6 KiB
C#
// Authors
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// Copyright (C) 2014 Stephan Sundermann <stephansundermann@gmail.com>
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using System;
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using Gst;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace GstreamerSharp
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{
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class Playback
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{
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static Element Pipeline;
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static GLib.MainLoop MainLoop;
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// Process a color balance command
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static void UpdateColorChannel (string channelName, bool increase, Gst.Video.IColorBalance cb) {
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// Retrieve the list of channels and locate the requested one
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var channels = cb.ListChannels ();
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Gst.Video.ColorBalanceChannel channel = null;
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foreach (var ch in channels) {
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var label = ch.Label;
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if (label.Contains (channelName)) {
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channel = ch;
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break;
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}
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}
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if (channel == null)
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return;
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// Change the channel's value
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var step = 0.1 * (channel.MaxValue - channel.MinValue);
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var value = cb.GetValue (channel);
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if (increase) {
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value = (int)(value + step);
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if (value > channel.MaxValue)
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value = channel.MaxValue;
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} else {
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value = (int)(value - step);
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if (value < channel.MinValue)
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value = channel.MinValue;
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}
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cb.SetValue (channel, value);
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}
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// Process keyboard input
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static bool HandleKeyboard () {
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if (Console.KeyAvailable) {
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var key = Console.ReadKey (false);
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var cb = new Gst.Video.ColorBalanceAdapter (Pipeline.Handle);
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switch (key.Key) {
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case ConsoleKey.C:
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UpdateColorChannel ("CONTRAST", key.Modifiers == ConsoleModifiers.Shift, cb);
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break;
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case ConsoleKey.B:
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UpdateColorChannel ("BRIGHTNESS", key.Modifiers == ConsoleModifiers.Shift, cb);
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break;
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case ConsoleKey.H:
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UpdateColorChannel ("HUE", key.Modifiers == ConsoleModifiers.Shift, cb);
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break;
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case ConsoleKey.S:
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UpdateColorChannel ("SATURATION", key.Modifiers == ConsoleModifiers.Shift, cb);
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break;
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case ConsoleKey.Q:
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MainLoop.Quit ();
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break;
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}
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PrintCurrentValues ();
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}
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return true;
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}
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// Output the current values of all Color Balance channels
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static void PrintCurrentValues () {
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// Output Color Balance value
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var cb = new Gst.Video.ColorBalanceAdapter (Pipeline.Handle);
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var channels = cb.ListChannels ();
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foreach (var ch in channels) {
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var value = cb.GetValue (ch);
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Console.WriteLine ("{0}: {1}", ch.Label, 100 * (value - ch.MinValue) / (ch.MaxValue - ch.MinValue));
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}
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Console.WriteLine ();
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}
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public static void Main (string[] args)
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{
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// Initialize GStreamer
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Application.Init (ref args);
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GtkSharp.GstreamerSharp.ObjectManager.Initialize ();
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// Print usage map
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Console.WriteLine ("USAGE: Choose one of the following options, then press enter:");
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Console.WriteLine (" 'C' to increase contrast, 'c' to decrease contrast");
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Console.WriteLine (" 'B' to increase brightness, 'b' to decrease brightness");
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Console.WriteLine (" 'H' to increase hue, 'h' to decrease hue");
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Console.WriteLine (" 'S' to increase saturation, 's' to decrease saturation");
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Console.WriteLine (" 'Q' to quit");
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// Build the pipeline
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Pipeline = Parse.Launch ("playbin uri=http://freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm");
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// Add a keyboard watch so we get notified of keystrokes
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// Start playing
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var ret = Pipeline.SetState (State.Playing);
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if (ret == StateChangeReturn.Failure) {
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Console.WriteLine ("Unable to set the pipeline to the playing state.");
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return;
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}
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PrintCurrentValues ();
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// Create a GLib Main Loop and set it to run
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MainLoop = new GLib.MainLoop ();
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GLib.Timeout.Add (50, HandleKeyboard);
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MainLoop.Run ();
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// Free resources
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Pipeline.SetState (State.Null);
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}
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}
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} |