Add a new feature for Music on Hold. If you set the "digit" option for a

class in musiconhold.conf, a caller on hold may press this digit to switch
to listening to that music class.
  This involved adding a new callback for generators, which allow generators
to get notified of DTMF from the channel they are running on.  Then, a callback
was implemented for the music on hold generators.
(patch from bbryant)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@65505 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -82,7 +82,7 @@ ENUM changes
   * Added two new dialplan functions, ENUMQUERY and ENUMRESULT.  These
      functions will allow you to initiate an ENUM lookup from the dialplan,
      and Asterisk will cache the results.  ENUMRESULT can be used to access
-	 the results without doing multiple DNS queries.
+     the results without doing multiple DNS queries.
 
 Voicemail Changes
 -----------------
@@ -135,6 +135,13 @@ MeetMe Changes
      except it does operations on a channel by name, instead of number in a conference.
      This is a very useful feature in combination with the 'X' option to ChanSpy.
 
+Music On Hold Changes
+---------------------
+  * A new option, "digit", has been added for music on hold classes in 
+     musiconhold.conf.  If this is set for a music on hold class, a caller
+     listening to music on hold can press this digit to switch to listening
+     to this music on hold class.
+
 Miscellaneous 
 -------------
 

configs/musiconhold.conf.sample

@@ -39,7 +39,10 @@ directory=/var/lib/asterisk/moh
 ;[native-random]
 ;mode=files
 ;directory=/var/lib/asterisk/moh
-;random=yes 	; Play the files in a random order
+;random=yes     ; Play the files in a random order
+;digit=#        ; If this option is set for a class, then when callers are
+;               ; listening to music on hold, they can press this digit, and
+;               ; they will switch to listening to this music class.
 
 
 ; =========

include/asterisk/channel.h

@@ -182,6 +182,8 @@ struct ast_generator {
 	void *(*alloc)(struct ast_channel *chan, void *params);
 	void (*release)(struct ast_channel *chan, void *data);
 	int (*generate)(struct ast_channel *chan, void *data, int len, int samples);
+	/*! This gets called when DTMF_END frames are read from the channel */
+	void (*digit)(struct ast_channel *chan, char digit);
 };
 
 /*! \brief Structure for a data store type */

main/channel.c

@@ -2420,6 +2420,9 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
 	chan->fin = FRAMECOUNT_INC(chan->fin);
 
 done:
+	if (chan->music_state && chan->generator && chan->generator->digit && f && f->frametype == AST_FRAME_DTMF_END)
+		chan->generator->digit(chan, f->subclass);
+
 	ast_channel_unlock(chan);
 	return f;
 }

res/res_musiconhold.c

@@ -36,6 +36,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #include <stdlib.h>
 #include <errno.h>
+#include <ctype.h>
 #include <unistd.h>
 #include <string.h>
 #include <signal.h>
@@ -130,6 +131,7 @@ struct mohclass {
 	char dir[256];
 	char args[256];
 	char mode[80];
+	char digit;
 	/*! A dynamically sized array to hold the list of filenames in "files" mode */
 	char **filearray;
 	/*! The current size of the filearray */
@@ -324,11 +326,42 @@ static void *moh_files_alloc(struct ast_channel *chan, void *params)
 	return chan->music_state;
 }
 
+/*! \note This function should be called with the mohclasses list locked */
+static struct mohclass *get_mohbydigit(char digit)
+{
+	struct mohclass *moh = NULL;
+
+	AST_RWLIST_TRAVERSE(&mohclasses, moh, list) {
+		if (digit == moh->digit)
+			break;
+	}
+
+	return moh;
+}
+
+static void moh_handle_digit(struct ast_channel *chan, char digit)
+{
+	struct mohclass *moh;
+	const char *classname;
+
+	AST_RWLIST_RDLOCK(&mohclasses);
+	if ((moh = get_mohbydigit(digit)))
+		classname = ast_strdupa(moh->name);
+	AST_RWLIST_UNLOCK(&mohclasses);
+
+	if (!moh)
+		return;
+
+	ast_moh_stop(chan);
+	ast_moh_start(chan, classname, NULL);
+}
+
 static struct ast_generator moh_file_stream = 
 {
 	alloc: moh_files_alloc,
 	release: moh_files_release,
 	generate: moh_files_generator,
+	digit: moh_handle_digit,
 };
 
 static int spawn_mp3(struct mohclass *class)
@@ -742,6 +775,7 @@ static struct ast_generator mohgen =
 	alloc: moh_alloc,
 	release: moh_release,
 	generate: moh_generate,
+	digit: moh_handle_digit
 };
 
 static int moh_add_file(struct mohclass *class, const char *filepath)
@@ -996,9 +1030,9 @@ static int load_moh_classes(int reload)
 	for (; cat; cat = ast_category_browse(cfg, cat)) {
 		/* These names were deprecated in 1.4 and should not be used until after the next major release. */
 		if (strcasecmp(cat, "classes") && strcasecmp(cat, "moh_files")) {			
-			if (!(class = moh_class_malloc())) {
+			if (!(class = moh_class_malloc()))
 				break;
-			}				
+
 			ast_copy_string(class->name, cat, sizeof(class->name));	
 			var = ast_variable_browse(cfg, cat);
 			while (var) {
@@ -1008,6 +1042,8 @@ static int load_moh_classes(int reload)
 					ast_copy_string(class->dir, var->value, sizeof(class->dir));
 				else if (!strcasecmp(var->name, "application"))
 					ast_copy_string(class->args, var->value, sizeof(class->args));
+				else if (!strcasecmp(var->name, "digit") && (isdigit(*var->value) || strchr("*#", *var->value)))
+					class->digit = *var->value;
 				else if (!strcasecmp(var->name, "random"))
 					ast_set2_flag(class, ast_true(var->value), MOH_RANDOMIZE);
 				else if (!strcasecmp(var->name, "format")) {
@@ -1143,6 +1179,8 @@ static int moh_classes_show(int fd, int argc, char *argv[])
 		ast_cli(fd, "Class: %s\n", class->name);
 		ast_cli(fd, "\tMode: %s\n", S_OR(class->mode, "<none>"));
 		ast_cli(fd, "\tDirectory: %s\n", S_OR(class->dir, "<none>"));
+		if (class->digit)
+			ast_cli(fd, "\tDigit: %c\n", class->digit);
 		if (ast_test_flag(class, MOH_CUSTOM))
 			ast_cli(fd, "\tApplication: %s\n", S_OR(class->args, "<none>"));
 		if (strcasecmp(class->mode, "files"))