121 lines
3.4 KiB
C#
121 lines
3.4 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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namespace GstreamerSharp
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{
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class Playback
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{
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static bool Playing; // Playing or Paused
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static double Rate; //Current playback rate (can be negative)
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static Element Pipeline, VideoSink;
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// Send seek event to change rate
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static void SendSeekEvent () {
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var format = Format.Time;
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long position;
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// Obtain the current position, needed for the seek event
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if (!Pipeline.QueryPosition (format, out position)) {
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Console.WriteLine ("Unable to retrieve current position.");
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return;
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}
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Event seekEvent;
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// Create the seek event
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if (Rate > 0) {
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seekEvent = Event.NewSeek (Rate, Format.Time, SeekFlags.Flush | SeekFlags.Accurate, SeekType.Set, position, SeekType.None, 0);
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} else {
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seekEvent = Event.NewSeek (Rate, Format.Time, SeekFlags.Flush | SeekFlags.Accurate, SeekType.Set, 0, SeekType.Set, position);
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}
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if (VideoSink == null) {
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// If we have not done so, obtain the sink through which we will send the seek events
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VideoSink = (Element)Pipeline ["video-sink"];
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}
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// Send the event
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VideoSink.SendEvent (seekEvent);
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Console.WriteLine ("Current rate: {0}", Rate);
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}
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// Process keyboard input
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static void HandleKeyboard () {
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ConsoleKeyInfo x;
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bool terminate = false;
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while (!terminate) {
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x = Console.ReadKey ();
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switch (x.Key) {
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case ConsoleKey.P :
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Playing = !Playing;
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Pipeline.SetState (Playing ? State.Playing : State.Paused);
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Console.WriteLine ("Setting state to {0}", Playing ? "PLAYING" : "PAUSE");
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break;
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case ConsoleKey.S:
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if (x.Modifiers == ConsoleModifiers.Shift)
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Rate *= 2.0;
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else
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Rate /= 2.0;
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SendSeekEvent ();
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break;
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case ConsoleKey.D:
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Rate *= -1.0;
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SendSeekEvent ();
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break;
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case ConsoleKey.N:
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if (VideoSink == null) {
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// If we have not done so, obtain the sink through which we will send the step events
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VideoSink = (Element)Pipeline ["video-sink"];
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}
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var evnt = Event.NewStep (Format.Buffers, 1, Rate, true, false);
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VideoSink.SendEvent (evnt);
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Console.WriteLine ("Stepping one frame");
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break;
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case ConsoleKey.Q:
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terminate = true;
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break;
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default:
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break;
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}
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}
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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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// 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 (" 'P' to toggle between PAUSE and PLAY");
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Console.WriteLine (" 'S' to increase playback speed, 's' to decrease playback speed");
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Console.WriteLine (" 'D' to toggle playback direction");
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Console.WriteLine (" 'N' to move to next frame (in the current direction, better in PAUSE)");
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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://download.blender.org/durian/trailer/sintel_trailer-1080p.mp4");
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Pipeline = Parse.Launch ("playbin uri=file:///home/stephan/Downloads/sintel_trailer-1080p.mp4");
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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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Playing = true;
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Rate = 1.0;
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// Process input
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HandleKeyboard ();
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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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} |