This patch adds support for controlling a playback operation from the

Asterisk REST interface.

This adds the /playback/{playbackId}/control resource, which may be
POSTed to to pause, unpause, reverse, forward or restart the media
playback.

Attempts to control a playback that is not currently playing will
either return a 404 Not Found (because the playback object no longer
exists) or a 409 Conflict (because the playback object is still in the
queue to be played).

This patch also adds skipms and offsetms parameters to the
/channels/{channelId}/play resource.

(closes issue ASTERISK-21587)
Review: https://reviewboard.asterisk.org/r/2559


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389603 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/stasis_app.h

@@ -174,6 +174,18 @@ struct ast_channel_snapshot *stasis_app_control_get_snapshot(
 void stasis_app_control_publish(
 	struct stasis_app_control *control, struct stasis_message *message);
 
+/*!
+ * \brief Queue a control frame without payload.
+ *
+ * \param control Control to publish to.
+ * \param frame_type type of control frame.
+ *
+ * \return zero on success
+ * \return non-zero on failure
+ */
+int stasis_app_control_queue_control(struct stasis_app_control *control,
+	enum ast_control_frame_type frame_type);
+
 /*!
  * \brief Increment the res_stasis reference count.
  *