Stefan Knoblich 5367b96153 ftmod_isdn: Rework teletone buffer offset handling in isdn_tones_run().
Store the offset in the teletone buffer in the b-channel private data.

An NT-mode setup with ftmod_misdn showed severe (dial-)tone distortions
in a sound editor (330Hz sine wave phase errors), caused by
using a global teletone buffer offset.

Switching to a per-channel offset, that is advanced by the amount
of data actually written to the channel, removes (almost) all
distortions.

There is still a minimal phase error every ~500ms (audible) that
needs more investigating.

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
2012-07-26 01:21:47 +02:00
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2012-06-25 08:55:48 +00:00
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2012-05-28 16:35:00 +00:00
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doh
2012-07-05 14:45:11 -05:00
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FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unl
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