[asterisk-commits] mnicholson: branch group/res_fax r242408 - /team/group/res_fax/res/res_fax.c

[SVN commits to the Asterisk project]

Author: mnicholson
Date: Fri Jan 22 12:37:06 2010
New Revision: 242408

URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=242408
Log:
Generate 3 seconds of CED tone before T.38 negotiation when in receive mode and only send silence in between CNG bursts, not when T.38 negotiation has been requested.

Modified:
    team/group/res_fax/res/res_fax.c

Modified: team/group/res_fax/res/res_fax.c
URL: http://svnview.digium.com/svn/asterisk/team/group/res_fax/res/res_fax.c?view=diff&rev=242408&r1=242407&r2=242408
==============================================================================
--- team/group/res_fax/res/res_fax.c (original)
+++ team/group/res_fax/res/res_fax.c Fri Jan 22 12:37:06 2010
@@ -633,7 +633,7 @@
 /*! \brief this is the generic FAX session handling function */
 static int generic_fax_exec(struct ast_channel *chan, struct ast_fax_session_details *details)
 {
-	int ms = 1000;
+	int ms;
 	int timeout = RES_FAX_TIMEOUT;
 	int res = 0, chancount;
 	unsigned int expected_frametype = -1;
@@ -658,6 +658,63 @@
 
 	chancount = 1;
 
+	/* generate 3 seconds of CED if we are in receive mode */
+	if (details->caps & AST_FAX_TECH_RECEIVE) {
+		ms = 3000;
+		if (ast_tonepair_start(chan, 2100, 0, ms, 0)) {
+			ast_log(LOG_ERROR, "error generating CED tone on %s\n", chan->name);
+			return -1;
+		}
+
+		do {
+			ast_waitfor(chan, ms);
+			if (ms < 0) {
+				ast_log(LOG_ERROR, "error while generating CED tone on %s\n", chan->name);
+				ast_tonepair_stop(chan);
+				return -1;
+			}
+
+			if (ms == 0) { /* all done, nothing happened */
+				break;
+			}
+
+			if (!(frame = ast_read(chan))) {
+				ast_log(LOG_ERROR, "error reading frame while generating CED tone on %s\n", chan->name);
+				ast_tonepair_stop(chan);
+				return -1;
+			}
+
+			if ((frame->frametype == AST_FRAME_CONTROL) &&
+					(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
+					(frame->datalen == sizeof(t38_parameters))) {
+				struct ast_control_t38_parameters *parameters = frame->data.ptr;
+
+				switch (parameters->request_response) {
+				case AST_T38_REQUEST_NEGOTIATE:
+					/* the other end has requested a switch to T.38, so reply that we are willing, if we can
+					 * do T.38 as well
+					 */
+					t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
+					t38_parameters.request_response = (details->caps & AST_FAX_TECH_T38) ? AST_T38_NEGOTIATED : AST_T38_REFUSED;
+					ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
+					break;
+				case AST_T38_NEGOTIATED:
+					ast_log(LOG_NOTICE, "Negotiated T.38 for receive on %s\n", chan->name);
+					t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
+					details->caps &= ~AST_FAX_TECH_AUDIO;
+					report_fax_status(chan, details, "T.38 Negotiated");
+					t38negotiated = 1;
+					ms = 0;
+					break;
+				default:
+					break;
+				}
+			}
+			ast_frfree(frame);
+		} while (ms > 0);
+		ast_tonepair_stop(chan);
+	}
+
 	switch ((t38_state = ast_channel_get_t38_state(chan))) {
 	case T38_STATE_UNKNOWN:
 		if (details->caps & AST_FAX_TECH_SEND) {
@@ -709,9 +766,11 @@
 	}
 
 	if (request_t38 || !details->option.allow_audio) {
-		struct ast_silence_generator *silence_gen;
-
-		silence_gen = ast_channel_start_silence_generator(chan);
+		struct ast_silence_generator *silence_gen = NULL;
+
+		if (send_cng != -1) {
+			silence_gen = ast_channel_start_silence_generator(chan);
+		}
 
 		while (timeout > 0) {
 			if (send_cng > 3000) {
@@ -719,7 +778,7 @@
 				silence_gen = NULL;
 				ast_tonepair_start(chan, 1100, 0, 500, 0);
 				send_cng = 0;
-			} else if (!chan->generator) {
+			} else if (!chan->generator && (send_cng != -1)) {
 				/* The CNG tone is done so restart silence generation. */
 				silence_gen = ast_channel_start_silence_generator(chan);
 			}