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dahdi_echocan_oslec: Call olsec_hpf_tx if CONFIG_DAHDI_PROCESS_ECHOCAN_TX is defined.

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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
This commit is contained in:
Shaun Ruffell 2010-10-20 12:23:11 +00:00
parent 2ba1b4c201
commit 072ccc9b69
1 changed files with 22 additions and 0 deletions
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22
drivers/dahdi/dahdi_echocan_oslec.c
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@ -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)) {