diff options
| author | Shaun Ruffell <sruffell@digium.com> | 2010-10-20 12:23:11 +0000 |
|---|---|---|
| committer | Shaun Ruffell <sruffell@digium.com> | 2010-10-20 12:23:11 +0000 |
| commit | adfd5587c10a27dc0e843392c843a246587af22f (patch) | |
| tree | 8fcb72e5617af4770fa4d4f69066f3ec333af432 /drivers/dahdi/dahdi_echocan_oslec.c | |
| parent | 959478cbaaf1de7db9c4099d92cf23bfba7d11b8 (diff) | |
dahdi_echocan_oslec: Call olsec_hpf_tx if CONFIG_DAHDI_PROCESS_ECHOCAN_TX is defined.
It can be necessary to have low frequency filter for tx signal of DAHDI.
Otherwise, low-frequency signal from IP can reach a leased line, and
return back with nonlinear distortions. This will break an echo
canceler.
(closes issue #13562)
Reported by: biohumanoid
Patches:
dahdi_echocan_oslec.c.patch uploaded by biohumanoid (license 459)
I slightly modified the above patch in order to use echocan_process_tx
as the interface.
Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Kinsey Moore <kmoore@digium.com>
Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com>
git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9443 a0bf4364-ded3-4de4-8d8a-66a801d63aff
Diffstat (limited to 'drivers/dahdi/dahdi_echocan_oslec.c')
| -rw-r--r-- | drivers/dahdi/dahdi_echocan_oslec.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/dahdi/dahdi_echocan_oslec.c b/drivers/dahdi/dahdi_echocan_oslec.c index abbeb51..661877c 100644 --- a/drivers/dahdi/dahdi_echocan_oslec.c +++ b/drivers/dahdi/dahdi_echocan_oslec.c @@ -43,6 +43,10 @@ static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams * static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec); static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size); static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val); +#ifdef CONFIG_DAHDI_ECHOCAN_PROCESS_TX +static void echo_can_hpf_tx(struct dahdi_echocan_state *ec, + short *tx, u32 size); +#endif static const struct dahdi_echocan_factory my_factory = { .name = "OSLEC", @@ -55,6 +59,9 @@ static const struct dahdi_echocan_ops my_ops = { .echocan_free = echo_can_free, .echocan_process = echo_can_process, .echocan_traintap = echo_can_traintap, +#ifdef CONFIG_DAHDI_ECHOCAN_PROCESS_TX + .echocan_process_tx = echo_can_hpf_tx, +#endif }; struct ec_pvt { @@ -118,6 +125,21 @@ static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val) return 1; } +#ifdef CONFIG_DAHDI_ECHOCAN_PROCESS_TX +static void echo_can_hpf_tx(struct dahdi_echocan_state *ec, short *tx, u32 size) +{ + struct ec_pvt *pvt = dahdi_to_pvt(ec); + u32 SampleNum; + + for (SampleNum = 0; SampleNum < size; SampleNum++, tx++) { + short iCleanSample; + + iCleanSample = oslec_hpf_tx(pvt->oslec, *tx); + *tx = iCleanSample; + } +} +#endif + static int __init mod_init(void) { if (dahdi_register_echocan_factory(&my_factory)) { |