Adding Java wrapper for DtmfSender.

webrtc/sdk/android/api/org/webrtc/DtmfSender.java

Index: webrtc/sdk/android/api/org/webrtc/DtmfSender.java
diff --git a/webrtc/sdk/android/api/org/webrtc/DtmfSender.java b/webrtc/sdk/android/api/org/webrtc/DtmfSender.java
new file mode 100644
index 0000000000000000000000000000000000000000..20fdd2c1ff3083ba93735a53b516e995f38375d9
--- /dev/null
+++ b/webrtc/sdk/android/api/org/webrtc/DtmfSender.java
@@ -0,0 +1,84 @@
+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+/** Java wrapper for a C++ DtmfSenderInterface. */
+public class DtmfSender {
+  final long nativeDtmfSender;
+
+  public DtmfSender(long nativeDtmfSender) {
+    this.nativeDtmfSender = nativeDtmfSender;
+  }
+
+  /**
+   * @return true if this DtmfSender is capable of sending DTMF. Otherwise false.
+   */
+  public boolean canInsertDtmf() {
+    return nativeCanInsertDtmf(nativeDtmfSender);
+  }
+
+  /**
+   * Queues a task that sends the provided DTMF tones.
+   * <p>
+   * If insertDtmf is called on the same object while an existing task for this
+   * object to generate DTMF is still running, the previous task is canceled.
+   *
+   * @param tones        This parameter is treated as a series of characters. The characters 0
+   *                     through 9, A through D, #, and * generate the associated DTMF tones. The
+   *                     characters a to d are equivalent to A to D. The character ',' indicates a
+   *                     delay of 2 seconds before processing the next character in the tones
+   *                     parameter. Unrecognized characters are ignored.
+   * @param duration     Indicates the duration in ms to use for each character passed in the tones
+   *                     parameter. The duration cannot be more than 6000 or less than 70.
+   * @param interToneGap Indicates the gap between tones in ms. Must be at least 50 ms but should be
+   *                     as short as possible.
+   * @return             true on success and false on failure.
+   */
+  public boolean insertDtmf(String tones, int duration, int interToneGap) {
+    return nativeInsertDtmf(nativeDtmfSender, tones, duration, interToneGap);
+  }
+
+  /**
+   * @return The tones remaining to be played out
+   */
+  public String tones() {
+    return nativeTones(nativeDtmfSender);
+  }
+
+  /**
+   * @return The current tone duration value in ms. This value will be the value last set via the
+   *         insertDtmf() method, or the default value of 100 ms if insertDtmf() was never called.
+   */
+  public int duration() {
+    return nativeDuration(nativeDtmfSender);
+  }
+
+  /**
+   * @return The current value of the between-tone gap in ms. This value will be the value last set
+   *         via the insertDtmf() method, or the default value of 50 ms if insertDtmf() was never
+   *         called.
+   */
+  public int interToneGap() {
+    return nativeInterToneGap(nativeDtmfSender);
+  }
+
+  public void dispose() {
+    free(nativeDtmfSender);
+  }
+
+  private static native boolean nativeCanInsertDtmf(long nativeDtmfSender);
+  private static native boolean nativeInsertDtmf(
+      long nativeDtmfSender, String tones, int duration, int interToneGap);
+  private static native String nativeTones(long nativeDtmfSender);
+  private static native int nativeDuration(long nativeDtmfSender);
+  private static native int nativeInterToneGap(long nativeDtmfSender);
+  private static native void free(long nativeDtmfSender);
+};