shhhh

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4716 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_resample.h

@@ -154,6 +154,14 @@ SWITCH_DECLARE(int) switch_short_to_float(short *s, float *f, int len);
  */
 SWITCH_DECLARE(void) switch_swap_linear(int16_t *buf, int len);
 
+/*!
+  \brief Generate static noise
+  \param data the audio data buffer
+  \param samples the number of 2 byte samples
+  \param divisor the volume factor
+ */
+SWITCH_DECLARE(void) switch_generate_sln_silence(int16_t *data, uint32_t samples, uint32_t divisor);
+
 /*!
   \brief Change the volume of a signed linear audio frame
   \param data the audio data

src/mod/applications/mod_conference/mod_conference.c

@@ -1696,7 +1696,7 @@ static void conference_loop_output(conference_member_t *member)
 				
 			} else {
 				if (switch_test_flag(member, MFLAG_WASTE_BANDWIDTH)) {
-					memset(write_frame.data, 255, bytes);
+					switch_generate_sln_silence(write_frame.data, samples, 1400);
 					write_frame.datalen = bytes;
 					write_frame.samples = samples;
 					write_frame.timestamp = timer.samplecount;

src/switch_resample.c

@@ -183,6 +183,27 @@ SWITCH_DECLARE(void) switch_swap_linear(int16_t *buf, int len)
 	}
 }
 
+SWITCH_DECLARE(void) switch_generate_sln_silence(int16_t *data, uint32_t samples, uint32_t divisor)
+{
+	int16_t rnd, x,i;
+	uint32_t sum_rnd = 0;
+
+	assert(divisor);
+	
+	for(i = 0; i < samples; i++, sum_rnd = 0) {
+		for(x = 0; x < 7; x++) {
+			rnd = (int16_t) (rand() * sizeof(int16_t));
+			sum_rnd += rnd;
+		}
+		switch_normalize_to_16bit(sum_rnd);
+		*data = (int16_t) sum_rnd;
+		*data /= (int)divisor;
+
+		data++;
+	}
+}
+
+
 SWITCH_DECLARE(void) switch_change_sln_volume(int16_t *data, uint32_t samples, int32_t vol)
 {
     double newrate = 0;