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authorAndreas Eversberg <andreas@eversberg.eu>2008-09-06 09:03:46 +0200
committerKarsten Keil <kkeil@suse.de>2009-01-09 22:44:27 +0100
commit3bd69ad197a4a3d0085a5dc3b5796111bf176b12 (patch)
tree573d7c81f97ff0eb15f914d43dbf9f393cf00ded /drivers/isdn/mISDN/dsp_cmx.c
parent55a6af9749d6a31e087f304f2ea39db3bb7b3f3e (diff)
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mISDN: Add ISDN sample clock API to mISDN core
Add ISDN sample clock API to mISDN core (new file clock.c) hfcmulti and mISDNdsp use clock API. Signed-off-by: Andreas Eversberg <andreas@eversberg.eu> Signed-off-by: Karsten Keil <kkeil@suse.de>
Diffstat (limited to 'drivers/isdn/mISDN/dsp_cmx.c')
-rw-r--r--drivers/isdn/mISDN/dsp_cmx.c40
1 files changed, 16 insertions, 24 deletions
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index 04dbb407f7a..efe4c7430e6 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -1557,13 +1557,11 @@ send_packet:
schedule_work(&dsp->workq);
}
-static u32 samplecount;
+static u32 jittercount; /* counter for jitter check */;
struct timer_list dsp_spl_tl;
u32 dsp_spl_jiffies; /* calculate the next time to fire */
-#ifdef UNUSED
-static u32 dsp_start_jiffies; /* jiffies at the time, the calculation begins */
-#endif /* UNUSED */
-static struct timeval dsp_start_tv; /* time at start of calculation */
+static u16 dsp_count; /* last sample count */
+static int dsp_count_valid ; /* if we have last sample count */
void
dsp_cmx_send(void *arg)
@@ -1577,38 +1575,32 @@ dsp_cmx_send(void *arg)
int r, rr;
int jittercheck = 0, delay, i;
u_long flags;
- struct timeval tv;
- u32 elapsed;
- s16 length;
+ u16 length, count;
/* lock */
spin_lock_irqsave(&dsp_lock, flags);
- if (!dsp_start_tv.tv_sec) {
- do_gettimeofday(&dsp_start_tv);
+ if (!dsp_count_valid) {
+ dsp_count = mISDN_clock_get();
length = dsp_poll;
+ dsp_count_valid = 1;
} else {
- do_gettimeofday(&tv);
- elapsed = ((tv.tv_sec - dsp_start_tv.tv_sec) * 8000)
- + ((s32)(tv.tv_usec / 125) - (dsp_start_tv.tv_usec / 125));
- dsp_start_tv.tv_sec = tv.tv_sec;
- dsp_start_tv.tv_usec = tv.tv_usec;
- length = elapsed;
+ count = mISDN_clock_get();
+ length = count - dsp_count;
+ dsp_count = count;
}
if (length > MAX_POLL + 100)
length = MAX_POLL + 100;
-/* printk(KERN_DEBUG "len=%d dsp_count=0x%x.%04x dsp_poll_diff=0x%x.%04x\n",
- length, dsp_count >> 16, dsp_count & 0xffff, dsp_poll_diff >> 16,
- dsp_poll_diff & 0xffff);
- */
+ /* printk(KERN_DEBUG "len=%d dsp_count=0x%x\n", length, dsp_count); */
/*
- * check if jitter needs to be checked
- * (this is about every second = 8192 samples)
+ * check if jitter needs to be checked (this is every second)
*/
- samplecount += length;
- if ((samplecount & 8191) < length)
+ jittercount += length;
+ if (jittercount >= 8000) {
+ jittercount -= 8000;
jittercheck = 1;
+ }
/* loop all members that do not require conference mixing */
list_for_each_entry(dsp, &dsp_ilist, list) {