Create Bindings to enable WebRTC (#135)

* [webrtc] Adding GstPromise and GstWebRTCSessionDescription

* [webrtc] [NS] Debugging

* Get WebRTC related elements to work without throwing null exceptions

* add hasCurrentCaps to pad

* Add comments/documentation

* create WebRTCBin

* add isEqual to Structure

* add tests for Promise

* handle WebRTCSessionDescription memory ownership properly

* self review

* use pointer method for Promise.getReply()

* Add version testing for GStreamer 1.14 to PromiseTest and webrtc related low level structure tests.

* Remove GTYPE field from WebRTCSessionDescription which causes eager loading of native library.

src/org/freedesktop/gstreamer/Gst.java

@@ -1,4 +1,5 @@
 /* 
+ * Copyright (c) 2018 Antonio Morales
  * Copyright (c) 2018 Neil C Smith
  * Copyright (c) 2007 Wayne Meissner
  * 
@@ -44,6 +45,7 @@
 import org.freedesktop.gstreamer.elements.DecodeBin;
 import org.freedesktop.gstreamer.elements.PlayBin;
 import org.freedesktop.gstreamer.elements.URIDecodeBin;
+import org.freedesktop.gstreamer.elements.WebRTCBin;
 import org.freedesktop.gstreamer.glib.GDate;
 import org.freedesktop.gstreamer.glib.GInetAddress;
 import org.freedesktop.gstreamer.glib.GSocketAddress;
@@ -619,9 +621,12 @@ private static synchronized void loadAllClasses() {
                     PadTemplate.class,
                     Plugin.class,
                     PluginFeature.class,
+                    Promise.class,
                     Query.class,
                     Registry.class,
+                    SDPMessage.class,
                     Sample.class,
+                    WebRTCSessionDescription.class,
                     // ----------- Elements -------------
                     AppSink.class,
                     AppSrc.class,
@@ -632,6 +637,7 @@ private static synchronized void loadAllClasses() {
                     DecodeBin.class,
                     Pipeline.class,
                     PlayBin.class,
-                    URIDecodeBin.class
+                    URIDecodeBin.class,
+                    WebRTCBin.class
             );
 }

src/org/freedesktop/gstreamer/Pad.java

@@ -1,10 +1,11 @@
 /* 
+ * Copyright (C) 2018 Antonio Morales
  * Copyright (C) 2014 Tom Greenwood <tgreenwood@cafex.com>
  * Copyright (C) 2009 Tamas Korodi <kotyo@zamba.fm>
  * Copyright (C) 2007 Wayne Meissner
  * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
  *                    2000 Wim Taymans <wtay@chello.be>
- * 
+ *
  * This file is part of gstreamer-java.
  *
  * This code is free software: you can redistribute it and/or modify it under 
@@ -689,4 +690,13 @@ public PadTemplate getTemplate() {
         return GSTPAD_API.gst_pad_get_pad_template(this);
     }
 
+
+    /**
+     * Check if the pad has caps set on it with a GST_EVENT_CAPS events
+     *
+     * @return true if the pad has caps set
+     */
+    public boolean hasCurrentCaps() {
+        return GSTPAD_API.gst_pad_has_current_caps(this);
+    }
 }

src/org/freedesktop/gstreamer/Promise.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2018 Vinicius Tona
+ * Copyright (c) 2018 Antonio Morales
+ * 
+ * This file is part of gstreamer-java.
+ *
+ * This code is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * Lesser General Public License version 3 only, as published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License version 3 for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License version 3 along with
+ * this work. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.freedesktop.gstreamer;
+
+import static org.freedesktop.gstreamer.lowlevel.GstPromiseAPI.GSTPROMISE_API;
+
+import org.freedesktop.gstreamer.lowlevel.GstAPI.GstCallback;
+
+import com.sun.jna.Pointer;
+
+public class Promise extends MiniObject {
+  public static final String GTYPE_NAME = "GstPromise";
+
+  public static interface PROMISE_CHANGE {
+    /**
+     * Called whenever the state of the promise is changed from PENDING to any other {@link PromiseResult}
+     * 
+     * @param promise the original promise that had the callback attached to
+     */
+    public void onChange(Promise promise);
+  }
+
+  /**
+   * Creates a new instance of Promise. This constructor is used internally.
+   *
+   * @param init internal initialization data.
+   */
+  public Promise(final Initializer init) {
+    super(init);
+  }
+
+  /**
+   * Creates a new instance of promise
+   */
+  public Promise() {
+    this(initializer(GSTPROMISE_API.ptr_gst_promise_new()));
+  }
+
+  /**
+   * Creates a new instance of promise with a callback attached.
+   *
+   * @param listerner Listener to be called whenever the state of a {@link Promise} is changed
+   */
+  public Promise(final PROMISE_CHANGE listener) {
+    this(new Initializer(GSTPROMISE_API.ptr_gst_promise_new_with_change_func(new GstCallback() {
+      @SuppressWarnings("unused")
+      public void callback(Promise promise, Pointer userData) {
+        listener.onChange(promise);
+      }
+    }), false, false));
+  }
+
+  protected static Initializer initializer(final Pointer ptr) {
+    return new Initializer(ptr, false, true);
+  }
+
+  /**
+   * Wait for the promise to move out of the PENDING {@link PromiseResult} state.
+   * If the promise is not in PENDING then it will immediately return.
+   *
+   * @return the {@link PromiseResult} of the promise.
+   */
+  public PromiseResult waitResult() {
+    return GSTPROMISE_API.gst_promise_wait(this);
+  }
+
+  /**
+   * Set a reply on the promise. 
+   *
+   * Will wake up any waiters on the promise with the REPLIED {@link PromiseResult} state. 
+   * If the promise has already been interrupted than the replied will not be visible to any waiters
+   *
+   * @param structure the {@link Structure} to reply the promise with
+   */
+  public void reply(final Structure structure) {
+    GSTPROMISE_API.gst_promise_reply(this, structure);
+  }
+
+  /**
+   * Interrupt waiting for the result of the prommise. 
+   *
+   * Any waiters on the promise will receive the INTERRUPTED {@link PromiseResult} state.
+   */
+  public void interrupt() {
+    GSTPROMISE_API.gst_promise_interrupt(this);
+  }
+
+  /**
+   * Expire a promise.
+   *
+   * Any waiters on the promise will recieved the EXPIRED {@link PromiseResult} state.
+   */
+  public void expire() {
+    GSTPROMISE_API.gst_promise_expire(this);
+  }
+
+  /**
+   * Retrieve the reply set on the promise.
+   *
+   * The state of the promise must be in the REPLIED {@link PromiseResult} state.
+   * The return structure is owned by the promise and thus cannot be modified.
+   *
+   * @return the {@link Structure} set on the promise reply.
+   */
+  public Structure getReply() {
+    return Structure.objectFor(GSTPROMISE_API.ptr_gst_promise_get_reply(this), false, false);
+  }
+}

src/org/freedesktop/gstreamer/PromiseResult.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2018 Antonio Morales
+ * 
+ * This file is part of gstreamer-java.
+ *
+ * This code is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * Lesser General Public License version 3 only, as published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License version 3 for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License version 3 along with
+ * this work. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.freedesktop.gstreamer;
+
+import org.freedesktop.gstreamer.lowlevel.annotations.DefaultEnumValue;
+
+/**
+ * The result of a {@link Promise}
+ * Available since GStreamer 1.14
+ */
+public enum PromiseResult {
+    /** The initial state of a promise */
+    PENDING,
+    /** The promise was interrupted */
+    INTERRUPTED,
+    /** The promise has been resolved and it has a value */
+    REPLIED,
+    /** The promise is expired and won't return a result */
+    EXPIRED,
+    /** Unknown result */
+    @DefaultEnumValue UNKNOWN;
+}

src/org/freedesktop/gstreamer/SDPMessage.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018 Antonio Morales
+ * 
+ * This file is part of gstreamer-java.
+ *
+ * This code is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * Lesser General Public License version 3 only, as published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License version 3 for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License version 3 along with
+ * this work. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.freedesktop.gstreamer;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.freedesktop.gstreamer.lowlevel.GstSDPMessageAPI.GSTSDPMESSAGE_API;
+
+import org.freedesktop.gstreamer.lowlevel.NativeObject;
+
+import com.sun.jna.Pointer;
+
+public class SDPMessage extends NativeObject {
+    public static final String GTYPE_NAME = "GstSDPMessage";
+
+    /**
+     * Internally used constructor. Do not use.
+     *
+     * @param init internal initialization data
+     */
+    public SDPMessage(Initializer init) {
+        super(init);
+    }
+
+    /**
+     * Creates a new instance of SDPMessage
+     */
+    public SDPMessage() {
+        this(initializer());
+    }
+
+    /**
+     * A SDP formatted string representation of SDPMessage.
+     *
+     * Used for offer/answer exchanges for real time communicationse
+     *
+     * @return the SDP string representation of SDPMessage.
+     */
+    public String toString() {
+        return GSTSDPMESSAGE_API.gst_sdp_message_as_text(this);
+    }
+
+    /**
+     * Takes a SDP string and parses it and fills in all fields for SDPMessage.
+     *
+     * Look at https://tools.ietf.org/html/rfc4566 for more information on SDP
+     *
+     * @param sdpString the sdp string
+     */
+    public void parseBuffer(String sdpString) {
+        byte[] data = sdpString.getBytes(StandardCharsets.US_ASCII);
+        int length = sdpString.length();
+        GSTSDPMESSAGE_API.gst_sdp_message_parse_buffer(data, length, this);
+    }
+
+    /**
+     * Creates a copy of this SDPMessage.
+     *
+     * @return a copy of SDPMessage.
+     */
+    public SDPMessage copy(boolean shouldInvalidateOriginal) {
+        Pointer[] ptr = new Pointer[1];
+        GSTSDPMESSAGE_API.gst_sdp_message_copy(this, ptr);
+        if (shouldInvalidateOriginal) {
+            this.invalidate();
+        }
+        return new SDPMessage(initializer(ptr[0]));
+    }
+
+    private static Initializer initializer() {
+        Pointer[] ptr = new Pointer[1];
+        GSTSDPMESSAGE_API.gst_sdp_message_new(ptr);
+        return initializer(ptr[0]);
+    }
+
+    protected void disposeNativeHandle(Pointer ptr) {
+        GSTSDPMESSAGE_API.gst_sdp_message_free(ptr);
+    }
+}

src/org/freedesktop/gstreamer/SDPResult.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2018 Antonio Morales
+ * 
+ * This file is part of gstreamer-java.
+ *
+ * This code is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * Lesser General Public License version 3 only, as published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License version 3 for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License version 3 along with
+ * this work. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.freedesktop.gstreamer;
+
+import org.freedesktop.gstreamer.lowlevel.IntegerEnum;
+import org.freedesktop.gstreamer.lowlevel.annotations.DefaultEnumValue;
+
+/**
+ * The possible results for {@link SDPMessage} functions
+ */
+public enum SDPResult implements IntegerEnum {
+    /** A successful return value*/
+    OK(0),
+    /** A function to SDPMessage was given invalid paramters */
+    EINVAL(-1),
+    /** An unknown result */
+    @DefaultEnumValue
+    __UNKNWON_NATIVE_VALUE(~0);
+
+    SDPResult(int value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the integer value of the enum
+     * @return the integer value for this enum.
+     */
+    public int intValue() {
+        return value;
+    }
+
+    private int value;
+}

src/org/freedesktop/gstreamer/Structure.java

@@ -623,6 +623,15 @@ public String getName(int i) {
         return GSTSTRUCTURE_API.gst_structure_nth_field_name(this, i);
     }
 
+    /**
+     * Checks that two structures are equal
+     * @param structure the stucture to check if it's equal to this structure
+     * @return true if both structures are equal
+     */
+    public boolean isEqual(Structure structure) {
+        return GSTSTRUCTURE_API.gst_structure_is_equal(this, structure);
+    }
+
     @Override
     public String toString() {
         return GSTSTRUCTURE_API.gst_structure_to_string(this);