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rtpvrawpay: micro-optimise variable access in inner loop

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Store some values that don't change during the execution
of the inner loops locally, so the compiler knows that too.
This commit is contained in:
Tim-Philipp Müller 2014-06-16 13:51:03 +01:00
parent fdf95fecbd
commit 15a33ccc65
1 changed files with 15 additions and 10 deletions
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25
gst/rtp/gstrtpvrawpay.c
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@ -244,10 +244,12 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
guint line, offset;
guint8 *p0, *yp, *up, *vp;
guint ystride, uvstride;
guint xinc, yinc;
guint pgroup;
guint mtu;
guint width, height;
gint field, fields;
GstVideoFormat format;
GstVideoFrame frame;
gint interlaced;
GstBufferList *list;
@ -278,6 +280,11 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
interlaced = GST_VIDEO_INFO_IS_INTERLACED (&rtpvrawpay->vinfo);
format = GST_VIDEO_INFO_FORMAT (&rtpvrawpay->vinfo);
yinc = rtpvrawpay->yinc;
xinc = rtpvrawpay->xinc;
/* after how many packed lines we push out a buffer list */
lines_delay = GST_ROUND_UP_4 (height / 10);
@ -356,7 +363,7 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
/* get how may bytes we need for the remaining pixels */
pixels = width - offset;
length = (pixels * pgroup) / rtpvrawpay->xinc;
length = (pixels * pgroup) / xinc;
if (left >= length) {
/* pixels and header fit completely, we will write them and skip to the
@ -364,8 +371,8 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
next_line = TRUE;
} else {
/* line does not fit completely, see how many pixels fit */
pixels = (left / pgroup) * rtpvrawpay->xinc;
length = (pixels * pgroup) / rtpvrawpay->xinc;
pixels = (left / pgroup) * xinc;
length = (pixels * pgroup) / xinc;
next_line = FALSE;
}
GST_LOG_OBJECT (rtpvrawpay, "filling %u bytes in %u pixels", length,
@ -382,7 +389,7 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
if (next_line) {
/* go to next line we do this here to make the check below easier */
line += rtpvrawpay->yinc;
line += yinc;
}
/* calculate continuation marker */
@ -423,14 +430,14 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
"writing length %u, line %u, offset %u, cont %d", length, lin, offs,
cont);
switch (GST_VIDEO_INFO_FORMAT (&rtpvrawpay->vinfo)) {
switch (format) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGR:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_UYVY:
case GST_VIDEO_FORMAT_UYVP:
offs /= rtpvrawpay->xinc;
offs /= xinc;
memcpy (outdata, p0 + (lin * ystride) + (offs * pgroup), length);
outdata += length;
break;
@ -457,8 +464,7 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
yd1p = yp + (lin * ystride) + (offs);
yd2p = yd1p + ystride;
uvoff =
(lin / rtpvrawpay->yinc * uvstride) + (offs / rtpvrawpay->xinc);
uvoff = (lin / yinc * uvstride) + (offs / xinc);
udp = up + uvoff;
vdp = vp + uvoff;
@ -479,8 +485,7 @@ gst_rtp_vraw_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
guint8 *ydp, *udp, *vdp;
ydp = yp + (lin * ystride) + offs;
uvoff =
(lin / rtpvrawpay->yinc * uvstride) + (offs / rtpvrawpay->xinc);
uvoff = (lin / yinc * uvstride) + (offs / xinc);
udp = up + uvoff;
vdp = vp + uvoff;