[asterisk-bugs] [JIRA] (ASTERISK-23836) JACK_HOOK with more than 8Khz

[Dennis Guse (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-23836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dennis Guse updated ASTERISK-23836:
-----------------------------------

    Description: 
So far app_jack is limited to 8Khz only.
The following patch adds support for dynamic sampling rates using information provided by the channel.

Checked with Linphone and Ekiga using G.711 and G.722 on Ubuntu 14.04 64bit.

Limitations:
* Information, i.e. sampling rate, is taken from channel during initialization as audiohook does not provide this information then. Audiohook.internal_sampl_rate is set later, but no callback is called.

* Frame.datalen is computed using rate / 50 assuming a ptime of 20ms.
There is no internal API available to determine datalen for a SLINxx.

* Ringbuffer size is a DEFINE and thus must be quite big to be able to cope with 16Khz+

PS: This bug report is a duplicate of 20969
https://issues.asterisk.org/jira/browse/ASTERISK-20696?jql=text%20~%20%22app_jack%22

  was:
So far app_jack is limited to 8Khz only.
The following patch adds support for dynamic sampling rates using information provided by the channel.

Checked with Linphone on Ubuntu 14.04 64bit.

Limitations:
* Information, i.e. sampling rate, is taken from channel during initialization as audiohook does not provide this information then. Audiohook.internal_sampl_rate is set later, but no callback is called.

* Frame.datalen is computed using rate / 50 assuming a ptime of 20ms.
There is no internal API available to determine datalen for a SLINxx.

* Ringbuffer size is a DEFINE and thus must be quite big to be able to cope with 16Khz+

PS: This bug report is a duplicate of 20969
https://issues.asterisk.org/jira/browse/ASTERISK-20696?jql=text%20~%20%22app_jack%22


> JACK_HOOK with more than 8Khz
> -----------------------------
>
>                 Key: ASTERISK-23836
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23836
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Applications/app_jack
>    Affects Versions: SVN
>         Environment: Ubuntu 14.04 using 11.7 and trunk in combination with jackd and puredata.
>            Reporter: Dennis Guse
>            Severity: Minor
>         Attachments: patch-app_jack.c
>
>
> So far app_jack is limited to 8Khz only.
> The following patch adds support for dynamic sampling rates using information provided by the channel.
> Checked with Linphone and Ekiga using G.711 and G.722 on Ubuntu 14.04 64bit.
> Limitations:
> * Information, i.e. sampling rate, is taken from channel during initialization as audiohook does not provide this information then. Audiohook.internal_sampl_rate is set later, but no callback is called.
> * Frame.datalen is computed using rate / 50 assuming a ptime of 20ms.
> There is no internal API available to determine datalen for a SLINxx.
> * Ringbuffer size is a DEFINE and thus must be quite big to be able to cope with 16Khz+
> PS: This bug report is a duplicate of 20969
> https://issues.asterisk.org/jira/browse/ASTERISK-20696?jql=text%20~%20%22app_jack%22



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