[vlc-commits] stream_filter: smooth: minor optimization

[Frédéric Yhuel]

vlc | branch: master | Frédéric Yhuel <yhuelf at gmail.com> | Sun Nov 30 21:17:41 2014 +0100| [64c6d66017a81ef97fd45fb4cdcae071545aa766] | committer: Jean-Baptiste Kempf

stream_filter: smooth: minor optimization

Signed-off-by: Jean-Baptiste Kempf <jb at videolan.org>

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=64c6d66017a81ef97fd45fb4cdcae071545aa766
---

 modules/stream_filter/smooth/smooth.h |    1 +
 modules/stream_filter/smooth/utils.c  |    5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/modules/stream_filter/smooth/smooth.h b/modules/stream_filter/smooth/smooth.h
index 06f7236..1abeb7a 100644
--- a/modules/stream_filter/smooth/smooth.h
+++ b/modules/stream_filter/smooth/smooth.h
@@ -93,6 +93,7 @@ typedef struct sms_stream_s
     int            type;
     quality_level_t *current_qlvl; /* current quality level for Download() */
     uint64_t       rgi_bw[SMS_BW_SHORTSTATS]; /* Measured bandwidths of the N last chunks */
+    int            rgi_tidx;       /* tail index of rgi_bw */
     uint64_t       i_obw;          /* Overwall bandwidth average */
     unsigned int   i_obw_samples;  /* used to compute overall incrementally */
 } sms_stream_t;
diff --git a/modules/stream_filter/smooth/utils.c b/modules/stream_filter/smooth/utils.c
index 5ac45da..18ad13d 100644
--- a/modules/stream_filter/smooth/utils.c
+++ b/modules/stream_filter/smooth/utils.c
@@ -170,9 +170,8 @@ void bw_stats_put( sms_stream_t *sms, const uint64_t bw )
     }
     else
     {
-        memmove( sms->rgi_bw, &sms->rgi_bw[1],
-                sizeof(sms->rgi_bw[0]) * (SMS_BW_SHORTSTATS - 1) );
-        sms->rgi_bw[SMS_BW_SHORTSTATS - 1] = bw;
+        sms->rgi_tidx = (sms->rgi_tidx + 1) % SMS_BW_SHORTSTATS;
+        sms->rgi_bw[sms->rgi_tidx] = bw;
     }
 }