[Freeswitch-dev] question about CNG on late packages

[Xijing Dai]

I see.


I did set it suppress_cng=true, and it did not help. No difference at all.

This happens inside LAN.

When talking about the jitter buffer, we want to enable it on client, and
disable it inside freeswitch.
Therefore, in this case, should freeswitch do nothing?


Cheers




On Tue, Feb 5, 2013 at 11:35 PM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> Don't negotiate CNG in the SDP and it won't use it or disable it with
> suppress_cng=true in your channel or global vars.
>
>
>
> On Tue, Feb 5, 2013 at 4:32 AM, Steven Ayre <steveayre at gmail.com> wrote:
>
>> Because if a RTP packet is due and hasn't arrived yet you need something
>> to play. Audio isn't like TCP where you dropped packets can be
>> retransmitted, if it hasn't arrived by the time you want to play it it's
>> too late and you have to play silence to handle it.
>>
>> Your audio problems are more likely due to packet loss or jitter which is
>> why the RTP packet is overdue, not the CNG itself.
>>
>> It jitter's the problem enabling the jitterbuffer might help (at the
>> expense of increased lag). If loss is the problem there's no way to handle
>> that except as silence for the missing interval, you need to fix whatever
>> is causing the loss.
>>
>> -Steve
>>
>>
>> On 5 February 2013 10:23, Xijing Dai <dxj19831029 at gmail.com> wrote:
>>
>>> Hey all,
>>>
>>>
>>> Inside code
>>>
>>> switch_rtp.c file:
>>>
>>>    static int rtp_common_read(switch_rtp_t *rtp_session,
>>> switch_payload_t *payload_type, switch_frame_flag_t *flags,
>>> switch_io_flag_t io_flags)
>>>                  ................
>>>                  if (check || (bytes && !switch_test_flag(rtp_session,
>>> SWITCH_RTP_FLAG_USE_TIMER))) {
>>> if (!bytes && switch_test_flag(rtp_session, SWITCH_RTP_FLAG_USE_TIMER)) { /*
>>> We're late! We're Late! */
>>>  if (!switch_test_flag(rtp_session, SWITCH_RTP_FLAG_NOBLOCK) && status
>>> == SWITCH_STATUS_BREAK) {
>>> switch_cond_next();
>>>  continue;
>>> }
>>>
>>> return_cng_frame();  <------- this lane to return cng frame if late.
>>>  }
>>> }
>>>
>>>
>>> Could someone explain why we want to return cng frame when package is
>>> late? this is caused for me to hear very bad noise audio.
>>>
>>> Can I disable return CNG frame?
>>>
>>>
>>> Cheers
>>>
>>>
>>>
>>>
>>>
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
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>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
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>>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>>
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>>
>>
>
>
> --
> Anthony Minessale II
>
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>
> 
> 
>
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