[Linphone-developers] No Sound

[Jason Hennigar]

Hi All,

I have been having trouble getting the input audio to work with a 
console build of both Linphone 1.99 and 1.7.1 on a Blackfin 537 Stamp 
board running uClinux 2007R1.1-RC3 (2.6.19.3 kernel). The output audio 
works perfectly, and I see the input RTP packets being sent but with no 
audio data in the payload. The RTP Payload was somthing like 
F3F3F3F3F3F3F3F3F3F3F3F3F2F2F2F2F3F3F3F2F2F2F2F2...

The problem seems to be that ms_snd_card_set_capture() is not being 
called to specify whether the input should be from mic or line.

To fix this either uncomment the lines in sound_config_read() which 
checks and sets the audio levels and the input source or call 
ms_snd_card_set_capture() directly. Really uncommenting the input source 
check should be sufficient. A diff showing the lines to uncomment follows.

This might also be the problem with the input audio in the video call.

I also encountered a different situation using the unmodified 1.99 
version where by changing the .linphonerc caused the output audio to 
switch from DAC1 (lime) to DAC2 (black). Removing the changes causes the 
audio to switch back to DAC1. The modification was to add the rec_lev, 
play_lev, ring_lev and source under [sound] in the same place as they 
are in the 1.6.0 version. Anyone know why this would happen?

Cheers!
Jason

===================================================================
--- linphonecore.c
+++ linphonecore.c      (working copy)
@@ -305,7 +305,7 @@

void sound_config_read(LinphoneCore *lc)
{
-       /*int tmp;*/
+       int tmp;
       const char *tmpbuf;
       const char *devid;
       const MSList *elem;
@@ -330,7 +330,7 @@
       
devid=lp_config_get_string(lc->config,"sound","capture_dev_id",NULL);
       linphone_core_set_capture_device(lc,devid);

-/*
+
       tmp=lp_config_get_int(lc->config,"sound","play_lev",80);
       linphone_core_set_play_level(lc,tmp);
       tmp=lp_config_get_int(lc->config,"sound","ring_lev",80);
@@ -339,7 +339,7 @@
       linphone_core_set_rec_level(lc,tmp);
       tmpbuf=lp_config_get_string(lc->config,"sound","source","m");
       linphone_core_set_sound_source(lc,tmpbuf[0]);
-*/
+

       tmpbuf=PACKAGE_SOUND_DIR "/" LOCAL_RING;
       tmpbuf=lp_config_get_string(lc->config,"sound","local_ring",tmpbuf);