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// Authors
// Copyright (C) 2014 Stephan Sundermann <stephansundermann@gmail.com>
using System;
using Gst;
using System.Runtime.InteropServices;
namespace GstreamerSharp
{
class Playback
{
static bool Playing; // Playing or Paused
static double Rate; //Current playback rate (can be negative)
static Element Pipeline, VideoSink;
// Send seek event to change rate
static void SendSeekEvent () {
var format = Format.Time;
long position;
// Obtain the current position, needed for the seek event
if (!Pipeline.QueryPosition (format, out position)) {
Console.WriteLine ("Unable to retrieve current position.");
return;
}
Event seekEvent;
// Create the seek event
if (Rate > 0) {
seekEvent = Event.NewSeek (Rate, Format.Time, SeekFlags.Flush | SeekFlags.Accurate, SeekType.Set, position, SeekType.None, 0);
} else {
seekEvent = Event.NewSeek (Rate, Format.Time, SeekFlags.Flush | SeekFlags.Accurate, SeekType.Set, 0, SeekType.Set, position);
}
if (VideoSink == null) {
// If we have not done so, obtain the sink through which we will send the seek events
VideoSink = (Element)Pipeline ["video-sink"];
}
// Send the event
VideoSink.SendEvent (seekEvent);
Console.WriteLine ("Current rate: {0}", Rate);
}
// Process keyboard input
static void HandleKeyboard () {
ConsoleKeyInfo x;
bool terminate = false;
while (!terminate) {
x = Console.ReadKey ();
switch (x.Key) {
case ConsoleKey.P :
Playing = !Playing;
Pipeline.SetState (Playing ? State.Playing : State.Paused);
Console.WriteLine ("Setting state to {0}", Playing ? "PLAYING" : "PAUSE");
break;
case ConsoleKey.S:
if (x.Modifiers == ConsoleModifiers.Shift)
Rate *= 2.0;
else
Rate /= 2.0;
SendSeekEvent ();
break;
case ConsoleKey.D:
Rate *= -1.0;
SendSeekEvent ();
break;
case ConsoleKey.N:
if (VideoSink == null) {
// If we have not done so, obtain the sink through which we will send the step events
VideoSink = (Element)Pipeline ["video-sink"];
}
var evnt = Event.NewStep (Format.Buffers, 1, Rate, true, false);
VideoSink.SendEvent (evnt);
Console.WriteLine ("Stepping one frame");
break;
case ConsoleKey.Q:
terminate = true;
break;
default:
break;
}
}
}
public static void Main (string[] args)
{
// Initialize GStreamer
Application.Init (ref args);
// Print usage map
Console.WriteLine ("USAGE: Choose one of the following options, then press enter:");
Console.WriteLine (" 'P' to toggle between PAUSE and PLAY");
Console.WriteLine (" 'S' to increase playback speed, 's' to decrease playback speed");
Console.WriteLine (" 'D' to toggle playback direction");
Console.WriteLine (" 'N' to move to next frame (in the current direction, better in PAUSE)");
Console.WriteLine (" 'Q' to quit");
// Build the pipeline
//Pipeline = Parse.Launch ("playbin uri=http://download.blender.org/durian/trailer/sintel_trailer-1080p.mp4");
Pipeline = Parse.Launch ("playbin uri=file:///home/stephan/Downloads/sintel_trailer-1080p.mp4");
// Start playing
var ret = Pipeline.SetState (State.Playing);
if (ret == StateChangeReturn.Failure) {
Console.WriteLine ("Unable to set the pipeline to the playing state.");
return;
}
Playing = true;
Rate = 1.0;
// Process input
HandleKeyboard ();
// Free resources
Pipeline.SetState (State.Null);
}
}
}
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