[asterisk-dev] [Code Review] 3618: App_jack: more than 8Khz

[Dennis Guse]

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https://reviewboard.asterisk.org/r/3618/
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(Updated June 13, 2014, 12:19 p.m.)


Review request for Asterisk Developers.


Bugs: ASTERISK-20696 and ASTERISK-23836
    https://issues.asterisk.org/jira/browse/ASTERISK-20696
    https://issues.asterisk.org/jira/browse/ASTERISK-23836


Repository: Asterisk


Description
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Target: app_jack.c

Enables the jack-audiohook to cope with dynamic sampling rates from and to Asterisk.
Information from channel is taken to derive the channel's sampling rate, suiting SLINxx format and frame->datalen.

Limitations:
* Required information 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 available to inform app_jack.

* 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+


Diffs
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  /trunk/channels/chan_sip.c 415578 
  /trunk/apps/app_jack.c 415578 

Diff: https://reviewboard.asterisk.org/r/3618/diff/


Testing
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Checked with jackd and puredata using G.711 and G.722 on Ubuntu 14.0.4 64bit using Linphone and Ekiga.


Thanks,

Dennis Guse

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