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Improve T.38 gateway V.21 preamble detection.

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This commit removes the V.21 preamble detection code previously added to the
generic DSP implementation in Asterisk, and instead enhances the res_fax module
to be able to utilize V.21 preamble detection functionality made available by
FAX technology modules. This commit also adds such support to res_fax_spandsp,
which uses the Spandsp modem tone detection code to do the V.21 preamble
detection.

There should be no functional change here, other than much more reliable V.21
preamble detection (and thus T.38 gateway initiation).
........

Merged revisions 349248 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@349249 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2011-12-28 18:59:16 +00:00
parent d9651f2be9
commit fdda494776
5 changed files with 211 additions and 232 deletions
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5
include/asterisk/dsp.h
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@@ -45,9 +45,8 @@
#define DSP_FAXMODE_DETECT_CNG (1 << 0)
#define DSP_FAXMODE_DETECT_CED (1 << 1)
#define DSP_FAXMODE_DETECT_V21 (1 << 2)
#define DSP_FAXMODE_DETECT_SQUELCH (1 << 3)
#define DSP_FAXMODE_DETECT_ALL (DSP_FAXMODE_DETECT_CNG | DSP_FAXMODE_DETECT_CED | DSP_FAXMODE_DETECT_V21)
#define DSP_FAXMODE_DETECT_SQUELCH (1 << 2)
#define DSP_FAXMODE_DETECT_ALL (DSP_FAXMODE_DETECT_CNG | DSP_FAXMODE_DETECT_CED)
#define DSP_TONE_STATE_SILENCE 0
#define DSP_TONE_STATE_RINGING 1