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| 19:27.32 | jgowdy | Hello |
| 19:28.55 | jgowdy | So I'm trying to patch dsp.c today, so that I can configure how many CNG tones we wait for before we're sure, since I have mixed use calls (could be voice or fax) that seem to erroneously detect CNG and start doing fax receive in some human's ear |
| 19:29.59 | jgowdy | Counting the CNG tones detected, and not reporting 'f' until we get FAX_TONE_CNG_COUNT is pretty straight forward |
| 19:31.09 | jgowdy | But I'm trying to figure out how I can set a rational boundary such that after 3.5 seconds has passed, the CNG count is reset, so that we don't get one false CNG and then 3 minutes later a second false CNG and report 'f'. |
| 19:32.07 | jgowdy | Measuring time in ast_dsp_process seems best done by measuring how many samples? or frames? have elapsed since we first thought we detected CNG |
| 19:33.07 | jgowdy | So my question is really, is an ast_frame representitive of one underlying audio layer frame, like in RTP sense, a 20ms or 30ms chunk? |
| 19:33.33 | jgowdy | Such that if I were to count frames and multiply by that sample size, I could measure time? |
| 19:33.54 | jgowdy | It seems like just using time with timerfd or something wouldn't be smart |
| 19:34.02 | file | if it is a constant stream, yes |
| 19:35.39 | jgowdy | Okay, cool. It seems like that would give a low cost rough in that's accurate enough to just reset a counter for sanity. |
| 19:36.09 | jgowdy | So the interval is supposed to be 3.5 seconds, if we decided 4 seconds worth of audio frames have been processed since the last detection, reset count to zero |
| 19:39.35 | jgowdy | It doesn't seem like the code expects the sample rate to change without resetting the dsp |
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| 19:59.20 | jgowdy | Can I trouble anyone to tell me if there's anything seemingly crazy about this diff? https://gist.github.com/jgowdy/9a659f363c24898622d9 |
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| 20:26.02 | *** topic/#asterisk-dev is Asterisk Development Discussion -=- http://www.asterisk.org/developers -=- Tier 2 and 3.14159265 support is in #asterisk -=- Hell hath frozen over: Asterisk is moving to Git -=- Follow on Twitter at @AsteriskDev |
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| 22:14.09 | jsmith | jgowdy: I don't claim to be any sort of expert, but your diff looks straightforward to me |
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| 23:02.23 | jgowdy | thanks |
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