Sample rate calculation gives a little bit too large results because
in real life there was around one milliseconds (~one usb packet) too
much data for given time. Calculate time more accurate in order to
provide better results.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/dvb-frontends/rtl2832_sdr.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/media/dvb-frontends/rtl2832_sdr.c b/drivers/media/dvb-frontends/rtl2832_sdr.c
index ba305a0..4f75753 100644
--- a/drivers/media/dvb-frontends/rtl2832_sdr.c
+++ b/drivers/media/dvb-frontends/rtl2832_sdr.c
@@ -365,17 +365,19 @@ static unsigned int rtl2832_sdr_convert_stream(struct rtl2832_sdr_state *s,
dst_len = 0;
}
- /* calculate samping rate and output it in 10 seconds intervals */
+ /* calculate sample rate and output it in 10 seconds intervals */
if (unlikely(time_is_before_jiffies(s->jiffies_next))) {
-#define MSECS 10000UL
+ #define MSECS 10000UL
+ unsigned int msecs = jiffies_to_msecs(jiffies -
+ s->jiffies_next + msecs_to_jiffies(MSECS));
unsigned int samples = s->sample - s->sample_measured;
s->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
s->sample_measured = s->sample;
dev_dbg(&s->udev->dev,
- "slen=%d samples=%u msecs=%lu sampling rate=%lu\n",
- src_len, samples, MSECS,
- samples * 1000UL / MSECS);
+ "slen=%u samples=%u msecs=%u sample rate=%lu\n",
+ src_len, samples, msecs,
+ samples * 1000UL / msecs);
}
/* total number of I+Q pairs */
--
http://palosaari.fi/
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