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Add samples/AppSrc.cs

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This sample started as a test case for a bug with Buffer.Data, but remains
useful as a example of how to use the AppSrc element.
This commit is contained in:
Maarten Bosmans 2009-06-20 22:55:27 +02:00 committed by Sebastian Dröge
parent d2fb19fd9d
commit 7698ae8801
2 changed files with 107 additions and 1 deletions
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103
samples/AppSrc.cs Normal file
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@ -0,0 +1,103 @@
/*
* AppSrc.cs: example of using the appsrc element
*
* Authors:
* Maarten Bosmans <mkbosmans@gmail.com>
*
* Copyright (C) 2009 Maarten Bosmans
*
*/
using System;
using System.Runtime.InteropServices;
using GLib;
using Gst;
using Cairo;
public class AppSrcDemo
{
static MainLoop loop;
static Gst.App.AppSrc appsrc;
static Pipeline pipeline;
public static void Main (string[] args)
{
Application.Init();
loop = new MainLoop();
// Construct all the elements
pipeline = new Pipeline();
appsrc = new Gst.App.AppSrc("AppSrcDemo");
Element color = ElementFactory.Make("ffmpegcolorspace");
Element sink = ElementFactory.Make("autovideosink");
// Link the elements
pipeline.Add(appsrc, color, sink);
Element.Link(appsrc, color, sink);
// Set the caps on the AppSrc to RGBA, 640x480, 4 fps, square pixels
appsrc.Caps = Gst.Video.VideoUtil.FormatNewCaps(Gst.Video.VideoFormat.BGRA, 640, 480, 4, 1, 1, 1);
// Connect the handlers
GLib.Signal.Lookup(appsrc, "need-data").AddDelegate(new EventHandler(PushAppData));
pipeline.Bus.AddSignalWatch();
pipeline.Bus.Message += MessageHandler;
// Run, loop, run!
pipeline.SetState(State.Playing);
loop.Run();
}
static void PushAppData(object o, EventArgs e)
{
ulong mseconds = 0;
if (appsrc.Clock != null)
mseconds = appsrc.Clock.Time / Clock.MSecond;
byte[] data = DrawData(mseconds);
Gst.Buffer buffer = new Gst.Buffer(data);
appsrc.PushBuffer(buffer);
}
// Returns a byte[] presentation of one 640x480 BGRA frame using Cairo
static byte[] DrawData(ulong seconds)
{
Cairo.ImageSurface img = new Cairo.ImageSurface(Cairo.Format.Argb32, 640, 480);
using(Cairo.Context context = new Cairo.Context(img))
{
double dx = (double) (seconds % 2180) / 5;
context.Color = new Color(1.0, 1.0, 0);
context.Paint();
context.MoveTo(300, 10 + dx);
context.LineTo(500 - dx, 400);
context.LineWidth = 4.0;
context.Color = new Color(0, 0, 1.0);
context.Stroke();
}
return img.Data;
}
static void MessageHandler(object sender, MessageArgs args)
{
Message message = args.Message;
string text = String.Format("Message from {0}: \t{1}", message.Src.Name, message.Type);
switch (message.Type) {
case MessageType.Error:
Enum err;
string msg;
message.ParseError(out err, out msg);
text += String.Format("\t({0})", msg);
break;
case MessageType.StateChanged:
State oldstate, newstate, pending;
message.ParseStateChanged(out oldstate, out newstate, out pending);
text += String.Format("\t\t{0} -> {1} ({2})", oldstate, newstate, pending);
break;
case MessageType.Eos:
loop.Quit();
break;
}
Console.WriteLine(text);
}
}

5
samples/Makefile.am
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@ -1,7 +1,7 @@
if USE_MONO_COMPILER
MCS_TARGETS = gtk-video-player.exe
endif
TARGETS = playbin-player.exe decodebin-transcoder.exe helloworld.exe typefind.exe metadata.exe $(MCS_TARGETS)
TARGETS = playbin-player.exe decodebin-transcoder.exe helloworld.exe typefind.exe metadata.exe appsrc.exe $(MCS_TARGETS)
DEBUGS = $(addsuffix .mdb, $(TARGETS))
all: $(TARGETS) link
@ -30,6 +30,9 @@ metadata.exe: $(srcdir)/MetaData.cs $(assemblies)
mp3launchparse.exe: $(srcdir)/MP3LaunchParse.cs $(assemblies)
$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) $(srcdir)/MP3LaunchParse.cs
appsrc.exe: $(srcdir)/AppSrc.cs $(assemblies)
$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) -r:Mono.Cairo.dll $(srcdir)/AppSrc.cs
gtk-video-player.exe: $(srcdir)/GtkVideoPlayer.cs $(assemblies)
$(CSC) -out:$@ $(GLIBSHARP_LIBS) $(references) -pkg:gtk-sharp-2.0 $(srcdir)/GtkVideoPlayer.cs