Expand speech API so that the developer can interact with the engine more directly and use specific functions of the connector even if a generic API call is not available

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@37881 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_speech_utils.c

@@ -228,6 +228,29 @@ static struct ast_custom_function speech_grammar_function = {
         .write = NULL,
 };
 
+/*! \brief SPEECH_ENGINE() Dialplan Function */
+static int speech_engine_write(struct ast_channel *chan, char *cmd, char *data, const char *value)
+{
+	struct ast_speech *speech = find_speech(chan);
+
+	if (data == NULL || speech == NULL)
+		return -1;
+
+	ast_speech_change(speech, data, value);
+
+	return 0;
+}
+
+static struct ast_custom_function speech_engine_function = {
+	.name = "SPEECH_ENGINE",
+	.synopsis = "Change a speech engine specific attribute.",
+	.syntax = "SPEECH_ENGINE(name)=value",
+	.desc =
+	"Changes a speech engine specific attribute.\n",
+	.read = NULL,
+	.write = speech_engine_write,
+};
+
 /*! \brief SPEECH() Dialplan Function */
 static int speech_read(struct ast_channel *chan, char *cmd, char *data,
 			char *buf, size_t len)
@@ -746,6 +769,7 @@ static int unload_module(void *mod)
 	res |= ast_custom_function_unregister(&speech_score_function);
 	res |= ast_custom_function_unregister(&speech_text_function);
 	res |= ast_custom_function_unregister(&speech_grammar_function);
+	res |= ast_custom_function_unregister(&speech_engine_function);
 
 	STANDARD_HANGUP_LOCALUSERS;
 
@@ -769,6 +793,7 @@ static int load_module(void *mod)
 	res |= ast_custom_function_register(&speech_score_function);
 	res |= ast_custom_function_register(&speech_text_function);
 	res |= ast_custom_function_register(&speech_grammar_function);
+	res |= ast_custom_function_register(&speech_engine_function);
 
 	return res;
 }

doc/speechrec.txt

@@ -109,6 +109,10 @@ Returns the recognized text of a result.
 
 Returns the matched grammar of the result.
 
+- SPEECH_ENGINE(name)=value
+
+Sets a speech engine specific attribute.
+
 * Dialplan Flow:
 -----------------
 

include/asterisk/speech.h

@@ -77,6 +77,8 @@ struct ast_speech_engine {
 	int (*write)(struct ast_speech *speech, void *data, int len);
 	/*! Prepare engine to accept audio */
 	int (*start)(struct ast_speech *speech);
+	/*! Change an engine specific setting */
+	int (*change)(struct ast_speech *speech, char *name, const char *value);
 	/*! Try to get results */
 	struct ast_speech_result *(*get)(struct ast_speech *speech);
 	/*! Accepted formats by the engine */
@@ -116,6 +118,8 @@ struct ast_speech *ast_speech_new(char *engine_name, int format);
 int ast_speech_destroy(struct ast_speech *speech);
 /*! \brief Write audio to the speech engine */
 int ast_speech_write(struct ast_speech *speech, void *data, int len);
+/*! \brief Change an engine specific attribute */
+int ast_speech_change(struct ast_speech *speech, char *name, const char *value);
 /*! \brief Change state of a speech structure */
 int ast_speech_change_state(struct ast_speech *speech, int state);
 /*! \brief Register a speech recognition engine */

res/res_speech.c

@@ -191,6 +191,18 @@ int ast_speech_write(struct ast_speech *speech, void *data, int len)
 	return res;
 }
 
+/*! \brief Change an engine specific attribute */
+int ast_speech_change(struct ast_speech *speech, char *name, const char *value)
+{
+	int res = 0;
+
+	if (speech->engine->change != NULL) {
+		res = speech->engine->change(speech, name, value);
+	}
+
+	return res;
+}
+
 /*! \brief Create a new speech structure using the engine specified */
 struct ast_speech *ast_speech_new(char *engine_name, int format)
 {