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AMPS: Add DTX support

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When DTX is enabled (-S dtx=2 or 3), a missing SAT tone causes the receiver
to mute audio and insert a low level of comfort noise.
Also the missing SAT tone will not cause the connection to be terminated.
This commit is contained in:
Andreas Eversberg
2017-05-25 09:57:22 +02:00
parent 2c1ab89723
commit bb64c6b3ba
7 changed files with 65 additions and 26 deletions
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13
src/amps/amps.c
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@@ -680,7 +680,10 @@ void amps_rx_sat(amps_t *amps, int tone, double quality)
if (tone) {
timer_stop(&trans->timer);
} else {
timer_start(&trans->timer, SAT_TO2);
if (!trans->dtx)
timer_start(&trans->timer, SAT_TO2);
else
timer_stop(&trans->timer);
}
}
@@ -769,6 +772,14 @@ reject:
trans_new_state(trans, TRANS_CALL_MT_ASSIGN);
trans->chan = vc->sender.kanal;
}
/* if we support DTX and also the phone does, we set DTX state of transaction */
if (amps->si.word2.dtx) {
if ((scm & 4)) {
PDEBUG(DAMPS, DEBUG_INFO, " -> Use DTX for this call\n");
trans->dtx = 1;
} else
PDEBUG(DAMPS, DEBUG_INFO, " -> Requested DTX, but not supported by phone\n");
}
} else
PDEBUG_CHAN(DAMPS, DEBUG_NOTICE, "Unsupported RECC messages: ORDER: %d ORDQ: %d MSG TYPE: %d (See Table 4 of specs.)\n", order, ordq, msg_type);
}