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sample: Add basic tutorial 6 sample
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Stephan Sundermann
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26bd788ba3
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1 changed files with 196 additions and 0 deletions
196
samples/BasicTutorial6.cs
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196
samples/BasicTutorial6.cs
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// 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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// Functions below print the capabilities in a human-friendly format
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static void PrintCaps (Caps caps, string pfx) {
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if (caps == null)
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return;
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if (caps.IsAny) {
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Console.WriteLine ("{0}ANY", pfx);
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return;
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}
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if (caps.IsEmpty) {
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Console.WriteLine ("{0}EMPTY", pfx);
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return;
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}
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for (uint i = 0; i < caps.Size; i++) {
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var structure = caps.GetStructure (i);
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Console.WriteLine ("{0}{1}", pfx, structure.Name);
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structure.Foreach ((field_id, value) => {
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var ptr = g_quark_to_string (field_id);
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var quark = GLib.Marshaller.Utf8PtrToString (ptr);
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Console.WriteLine ("{0} {1}: {2}", pfx, quark, value.Val);
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return true;
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});
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}
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}
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// Prints information about a Pad Template, including its Capabilities*/
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static void PrintPadTemplateInformation (ElementFactory factory) {
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Console.WriteLine ("Pad Templates for {0}:", factory.Name);
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if (factory.NumPadTemplates == 0) {
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Console.WriteLine (" none");
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return;
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}
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var pads = factory.StaticPadTemplates;
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foreach (var p in pads) {
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var pad = (StaticPadTemplate) p;
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if (pad.Direction == PadDirection.Src)
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Console.WriteLine (" SRC template: '{0}'", pad.NameTemplate);
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else if (pad.Direction == PadDirection.Sink)
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Console.WriteLine (" SINK template: '{0}'", pad.NameTemplate);
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else
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Console.WriteLine (" UNKNOWN!!! template: '{0}'", pad.NameTemplate);
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if (pad.Presence == PadPresence.Always)
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Console.WriteLine (" Availability: Always");
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else if (pad.Presence == PadPresence.Sometimes)
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Console.WriteLine (" Availability: Sometimes");
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else if (pad.Presence == PadPresence.Request) {
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Console.WriteLine (" Availability: On request");
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} else
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Console.WriteLine (" Availability: UNKNOWN!!!");
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if (pad.StaticCaps.String != null) {
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Console.WriteLine (" Capabilities:");
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PrintCaps (pad.StaticCaps.Get (), " ");
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}
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Console.WriteLine ();
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}
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}
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// Shows the CURRENT capabilities of the requested pad in the given element */
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static void PrintPadCapabilities (Element element, string padName) {
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// Retrieve pad
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var pad = element.GetStaticPad (padName);
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if (pad == null) {
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Console.WriteLine ("Could not retrieve pad '{0}'", padName);
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return;
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}
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// Retrieve negotiated caps (or acceptable caps if negotiation is not finished yet)
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var caps = pad.CurrentCaps;
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if (caps == null)
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caps = pad.Caps;
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/* Print and free */
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Console.WriteLine ("Caps for the {0} pad:", padName);
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PrintCaps (caps, " ");
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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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Gst.Application.Init(ref args);
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// Create the element factories
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var sourceFactory = ElementFactory.Find ("audiotestsrc");
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var sinkFactory = ElementFactory.Find ("autoaudiosink");
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if (sourceFactory == null || sinkFactory == null) {
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Console.WriteLine ("Not all element factories could be created.");
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return;
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}
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// Print information about the pad templates of these factories
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PrintPadTemplateInformation (sourceFactory);
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PrintPadTemplateInformation (sinkFactory);
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// Ask the factories to instantiate actual elements
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var source = sourceFactory.Create ("source");
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var sink = sinkFactory.Create ("sink");
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// Create the empty pipeline
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var pipeline = new Pipeline ("test-pipeline");
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if (pipeline == null || source == null || sink == null) {
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Console.WriteLine ("Not all elements could be created.");
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return;
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}
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// Build the pipeline
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pipeline.Add (source, sink);
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if (!source.Link (sink)) {
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Console.WriteLine ("Elements could not be linked.");
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return;
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}
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// Print initial negotiated caps (in NULL state)
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Console.WriteLine ("In NULL state:");
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PrintPadCapabilities (sink, "sink");
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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 (check the bus for error messages).");
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}
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// Wait until error, EOS or State Change
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var bus = pipeline.Bus;
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var terminate = false;
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do {
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var msg = bus.TimedPopFiltered (Constants.CLOCK_TIME_NONE, MessageType.Error | MessageType.Eos | MessageType.StateChanged);
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// Parse message
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if (msg != null) {
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switch (msg.Type) {
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case MessageType.Error:
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string debug;
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GLib.GException exc;
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msg.ParseError (out exc, out debug);
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Console.WriteLine ("Error received from element {0}: {1}", msg.Src.Name, exc.Message);
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Console.WriteLine ("Debugging information: {0}", debug != null ? debug : "none");
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terminate = true;
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break;
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case MessageType.Eos:
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Console.WriteLine ("End-Of-Stream reached.\n");
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terminate = true;
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break;
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case MessageType.StateChanged:
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// We are only interested in state-changed messages from the pipeline
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if (msg.Src == pipeline) {
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State oldState, newState, pendingState;
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msg.ParseStateChanged (out oldState, out newState, out pendingState);
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Console.WriteLine ("Pipeline state changed from {0} to {1}:",
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Element.StateGetName (oldState), Element.StateGetName (newState));
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// Print the current capabilities of the sink element
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PrintPadCapabilities (sink, "sink");
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}
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break;
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default:
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// We should not reach here because we only asked for ERRORs, EOS and STATE_CHANGED
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Console.WriteLine ("Unexpected message received.");
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break;
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}
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}
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} while (!terminate);
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// Free resources
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pipeline.SetState (State.Null);
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}
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[DllImport ("libglib-2.0.so.0")]
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static extern IntPtr g_quark_to_string (uint quark);
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}
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}
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