| Summary: | ASTERISK-13022: GSM sound quality degraded | ||
| Reporter: | Thomas Omerzu (t-o) | Labels: | |
| Date Opened: | 2008-11-06 04:18:15.000-0600 | Date Closed: | 2009-04-27 15:36:36 |
| Priority: | Major | Regression? | No |
| Status: | Closed/Complete | Components: | Channels/chan_misdn |
| Versions: | Frequency of Occurrence | ||
| Related Issues: | |||
| Environment: | Attachments: | ||
| Description: | The sound quality of the standard GSM files is horribly degraded when listening to them on mISDN channels. ****** ADDITIONAL INFORMATION ****** The problem does not occur on SIP channels. If I manually convert the GSM files to WAV files, sound quality will be back to what it was in 1.4.21.2. The problem is also present in 1.4.23-rc1. | ||
| Comments: | By: Matt Riddell (zx81) 2008-11-06 13:11:14.000-0600 This sounds pretty much the same as the issue I reported about a year ago, and fixed with the inclusion of a smoother. Will see if I can dig up the entry. By: Matt Riddell (zx81) 2008-11-06 13:16:24.000-0600 Heh nah that was the opposite: http://bugs.digium.com/view.php?id=10807 By: Kris Shaw (shawkris) 2008-11-28 06:25:33.000-0600 I have noticed the same problem with a SIP client - GSM prompts sound distorted when SIP client connects with ulaw/alaw. Recompiling with DONT_OPTIMIZE resolves the problem. Recompiling with libgsm 1.0.12 also makes the problem go away. Asterisk version 1.4.22 gcc version 4.2.3 By: Leif Madsen (lmadsen) 2009-02-02 16:33:50.000-0600 t-o: if you compile with GCC version 4.1, or with DONT_OPTIMIZE, do you get the same issue? It seems that GCC has an issue from 4.2 and up that causes the GSM codec to have degraded sound quality. It is not a bug in Asterisk itself. Thanks! By: Thomas Omerzu (t-o) 2009-02-04 05:52:44.000-0600 I was not able to test it with gcc-4.1, but on the gcc-4.2.3 running here, the DONT_OPTIMIZE option definitely solves the problem! By: Tilghman Lesher (tilghman) 2009-02-20 14:22:08.000-0600 dvossel: see if you can determine why gcc might improperly optimize the assembly in codecs/gsm/inc/private.h By: David Vossel (dvossel) 2009-04-14 16:05:24 unassigned this from myself, working on other issues at the moment and won't be able to start on it anytime soon. By: Frank Waller (explidous) 2009-04-14 17:34:19 This is a oldie but goldie and seems to pop back up again and again, I wish I had the time to look deeper in fixing this then the little makefile workaround I provided in ASTERISK-10762 which is the same problem, also ASTERISK-11849 which is the same again suggests that it might be fix when using gcc 4.3. By: Russell Bryant (russell) 2009-04-27 15:36:35 I'm closing this out as we think this is fixed when using a later version of gcc. | ||