framehooks: Add callback for determining if a hook is consuming frames of a specific type.

In the past framehooks have had no capability to determine what frame types a hook
is actually interested in consuming. This has meant that code has had to assume they
want all frames, thus preventing native bridging.

This change adds a callback which allows a framehook to be queried for whether it
is consuming a frame of a specific type. The native RTP bridging module has also
been updated to take advantange of this, allowing native bridging to occur when
previously it would not.

ASTERISK-23497 #comment Reported by: Etienne Lessard
ASTERISK-23497 #close

Review: https://reviewboard.asterisk.org/r/3522/
........

Merged revisions 413681 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@413682 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/channel.h

@@ -1049,8 +1049,8 @@ enum {
 	 */
 	AST_SOFTHANGUP_EXPLICIT =  (1 << 5),
 	/*!
-	 * Used to break a bridge so the channel can be spied upon
-	 * instead of actually hanging up.
+	 * Used to request that the bridge core re-evaluate the current
+	 * bridging technology in use by the bridge this channel is in.
 	 */
 	AST_SOFTHANGUP_UNBRIDGE =  (1 << 6),
 	/*!
@@ -4401,6 +4401,16 @@ const char *ast_channel_oldest_linkedid(const char *a, const char *b);
  */
 int ast_channel_has_audio_frame_or_monitor(struct ast_channel *chan);
 
+/*!
+ * \brief Check if the channel has any active hooks that require audio.
+ * \since 12.3.0
+ *
+ * \param chan The channel to check.
+ *
+ * \retval non-zero if channel has active audiohooks, audio framehooks, or monitor.
+ */
+int ast_channel_has_hook_requiring_audio(struct ast_channel *chan);
+
 /*!
  * \brief Removes the trailing identifiers from a channel name string
  * \since 12.0.0