Asterisk
/
asterisk
mirror of https://github.com/asterisk/asterisk
1
0
Fork 0
Code Issues Releases Wiki Activity

Merge Steven Davie's IAX2 jitter buffer enhancements

Browse Source 
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3274 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1.0
Mark Spencer 22 years ago
parent 5546e32355
commit f5de717d6e
1 changed files with 49 additions and 38 deletions
Show Stats Download Patch File Download Diff File

85
channels/chan_iax2.c
Unescape View File

@ -318,6 +318,8 @@ static struct iax2_registry *registrations;
#define DEFAULT_TRUNKDATA 640 * 10 /* 40ms, uncompressed linear * 10 channels */
#define MAX_TRUNKDATA 640 * 200 /* 40ms, uncompressed linear * 200 channels */
#define MAX_TIMESTAMP_SKEW 640
/* If we have more than this much excess real jitter buffer, srhink it. */
static int max_jitter_buffer = MAX_JITTER_BUFFER;
@ -1113,17 +1115,8 @@ static int __do_deliver(void *data)
the IAX thread with the iaxsl lock held. */
struct iax_frame *fr = data;
fr->retrans = -1;
if (iaxs[fr->callno] && !iaxs[fr->callno]->alreadygone) {
if (fr->af.frametype == AST_FRAME_IAX &&
fr->af.subclass == IAX_COMMAND_LAGRQ) {
/* send a lag response to a lag request that has
* gone through our jitter buffer */
fr->af.subclass = IAX_COMMAND_LAGRP;
iax2_send(iaxs[fr->callno], &fr->af, fr->ts, -1, 0, 0, 0);
} else {
iax2_queue_frame(fr->callno, &fr->af);
}
}
if (iaxs[fr->callno] && !iaxs[fr->callno]->alreadygone)
iax2_queue_frame(fr->callno, &fr->af);
/* Free our iax frame */
iax2_frame_free(fr);
/* And don't run again */
@ -1606,9 +1599,11 @@ static int schedule_delivery(struct iax_frame *fr, int reallydeliver, int update
int ms,x;
int drops[MEMORY_SIZE];
int min, max=0, maxone=0,y,z, match;
/* ms is a measure of the "lateness" of the packet relative to the first
packet we received, which always has a lateness of 1. Called by
IAX thread, with iaxsl lock held. */
packet we received. Understand that "ms" can easily be -ve if lag improves
since call start.
Called by IAX thread, with iaxsl lock held. */
ms = calc_rxstamp(iaxs[fr->callno]) - fr->ts;
if (ms > 32767) {
@ -1626,6 +1621,7 @@ static int schedule_delivery(struct iax_frame *fr, int reallydeliver, int update
fr->ts -= 65536;
}
/* delivery time is sender's sent timestamp converted back into absolute time according to our clock */
fr->af.delivery.tv_sec = iaxs[fr->callno]->rxcore.tv_sec;
fr->af.delivery.tv_usec = iaxs[fr->callno]->rxcore.tv_usec;
fr->af.delivery.tv_sec += fr->ts / 1000;
@ -1635,7 +1631,6 @@ static int schedule_delivery(struct iax_frame *fr, int reallydeliver, int update
fr->af.delivery.tv_sec += 1;
}
/* Rotate our history queue of "lateness". Don't worry about those initial
zeros because the first entry will always be zero */
if (updatehistory) {
@ -1709,9 +1704,15 @@ static int schedule_delivery(struct iax_frame *fr, int reallydeliver, int update
iaxs[fr->callno]->jitterbuffer = max
/* + ((float)iaxs[fr->callno]->jitter) * 0.1 */;
/* If the caller just wanted us to update, return now */
if (!reallydeliver)
return 0;
if (option_debug)
ast_log(LOG_DEBUG, "min = %d, max = %d, jb = %d, lateness = %d\n", min, max, iaxs[fr->callno]->jitterbuffer, ms);
/* Log jitter stats for possible offline analysis */
ast_log(LOG_DEBUG, "Jitter: call=%d ts=%d: min=%d max=%d jb=%d; lateness=%d; jitter=%d historic=%d\n",
fr->callno, fr->ts, min, max, iaxs[fr->callno]->jitterbuffer, ms,
iaxs[fr->callno]->jitter, iaxs[fr->callno]->historicjitter);
/* Subtract the lateness from our jitter buffer to know how long to wait
before sending our packet. */
@ -1720,25 +1721,21 @@ static int schedule_delivery(struct iax_frame *fr, int reallydeliver, int update
if (!use_jitterbuffer)
ms = 0;
/* If the caller just wanted us to update, return now */
if (!reallydeliver)
return 0;
if (ms < 1) {
if (option_debug)
ast_log(LOG_DEBUG, "Calculated ms is %d\n", ms);
/* Don't deliver it more than 4 ms late */
if ((ms > -4) || (fr->af.frametype != AST_FRAME_VOICE)) {
if (option_debug)
ast_log(LOG_DEBUG, "schedule_delivery: Delivering immediately (Calculated ms is %d)\n", ms);
__do_deliver(fr);
} else {
if (option_debug)
ast_log(LOG_DEBUG, "Dropping voice packet since %d ms is, too old\n", ms);
ast_log(LOG_DEBUG, "schedule_delivery: Dropping voice packet since %d ms is too old\n", ms);
/* Free our iax frame */
iax2_frame_free(fr);
}
} else {
if (option_debug)
ast_log(LOG_DEBUG, "Scheduling delivery in %d ms\n", ms);
ast_log(LOG_DEBUG, "schedule_delivery: Scheduling delivery in %d ms\n", ms);
fr->retrans = ast_sched_add(sched, ms, do_deliver, fr);
}
return 0;
@ -2588,7 +2585,7 @@ static unsigned int calc_txpeerstamp(struct iax2_trunk_peer *tpeer, int sampms,
ms = (tv->tv_sec - tpeer->txtrunktime.tv_sec) * 1000 + (tv->tv_usec - tpeer->txtrunktime.tv_usec) / 1000;
/* Predict from last value */
pred = tpeer->lastsent + sampms;
if (abs(ms - pred) < 640)
if (abs(ms - pred) < MAX_TIMESTAMP_SKEW)
ms = pred;
/* We never send the same timestamp twice, so fudge a little if we must */
@ -2621,6 +2618,13 @@ static unsigned int calc_timestamp(struct chan_iax2_pvt *p, unsigned int ts, str
int voice = 0;
int genuine = 0;
struct timeval *delivery = NULL;
/* What sort of frame do we have?: voice is self-explanatory
"genuine" means an IAX frame - things like LAGRQ/RP, PING/PONG, ACK
non-genuine frames are CONTROL frames [ringing etc], DTMF
The "genuine" distinction is needed because genuine frames must get a clock-based timestamp,
the others need a timestamp slaved to the voice frames so that they go in sequence
*/
if (f) {
if (f->frametype == AST_FRAME_VOICE) {
voice = 1;
@ -2637,6 +2641,7 @@ static unsigned int calc_timestamp(struct chan_iax2_pvt *p, unsigned int ts, str
/* If the timestamp is specified, just send it as is */
if (ts)
return ts;
/* If we have a time that the frame arrived, always use it to make our timestamp */
if (delivery && (delivery->tv_sec || delivery->tv_usec)) {
ms = (delivery->tv_sec - p->offset.tv_sec) * 1000 + (delivery->tv_usec - p->offset.tv_usec) / 1000;
} else {
@ -2646,19 +2651,24 @@ static unsigned int calc_timestamp(struct chan_iax2_pvt *p, unsigned int ts, str
ms = 0;
if (voice) {
/* On a voice frame, use predicted values if appropriate */
if (abs(ms - p->nextpred) <= 640) {
if (!p->nextpred)
p->nextpred = f->samples / 8;
if (abs(ms - p->nextpred) <= MAX_TIMESTAMP_SKEW) {
if (!p->nextpred) {
p->nextpred = ms; /*f->samples / 8;*/
if (p->nextpred <= p->lastsent)
p->nextpred = p->lastsent + 3;
}
ms = p->nextpred;
} else
p->nextpred = ms;
} else {
/* On a dataframe, use last value + 3 (to accomodate jitter buffer shrinkign) if appropriate unless
/* On a dataframe, use last value + 3 (to accomodate jitter buffer shrinking) if appropriate unless
it's a genuine frame */
if (genuine) {
/* genuine (IAX LAGRQ etc) must keep their clock-based stamps */
if (ms <= p->lastsent)
ms = p->lastsent + 3;
} else if (abs(ms - p->lastsent) <= 640) {
} else if (abs(ms - p->lastsent) <= MAX_TIMESTAMP_SKEW) {
/* non-genuine frames (!?) (DTMF, CONTROL) should be pulled into the predicted stream stamps */
ms = p->lastsent + 3;
}
}
@ -4955,10 +4965,8 @@ retryowner:
/* Handle the IAX pseudo frame itself */
if (option_debug)
ast_log(LOG_DEBUG, "IAX subclass %d received\n", f.subclass);
/* Go through the motions of delivering the packet without actually doing so,
unless this is a lag request since it will be done for real */
if (f.subclass != IAX_COMMAND_LAGRQ)
schedule_delivery(&fr, 0, updatehistory);
/* Go through the motions of delivering the packet without actually doing so */
schedule_delivery(&fr, 0, updatehistory);
switch(f.subclass) {
case IAX_COMMAND_ACK:
/* Do nothing */
@ -5248,15 +5256,18 @@ retryowner2:
f.samples = 0;
iax_frame_wrap(&fr, &f);
if(f.subclass == IAX_COMMAND_LAGRQ) {
/* A little strange -- We have to actually go through the motions of
delivering the packet. In the very last step, it will be properly
handled by do_deliver */
schedule_delivery(iaxfrdup2(&fr), 1, updatehistory);
/* Received a LAGRQ - echo back a LAGRP */
fr.af.subclass = IAX_COMMAND_LAGRP;
iax2_send(iaxs[fr.callno], &fr.af, fr.ts, -1, 0, 0, 0);
} else {
/* Received LAGRP in response to our LAGRQ */
unsigned int ts;
/* This is a reply we've been given, actually measure the difference */
ts = calc_timestamp(iaxs[fr.callno], 0, &fr.af);
iaxs[fr.callno]->lag = ts - fr.ts;
if (option_debug)
ast_log(LOG_DEBUG, "Peer %s lag measured as %dms\n",
inet_ntoa(iaxs[fr.callno]->addr.sin_addr), iaxs[fr.callno]->lag);
}
#ifdef BRIDGE_OPTIMIZATION
}

Write Preview
Loading…
Cancel
Save