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clock: Improve slaving regression.
Add domain checks for the input values, and a variable precision calculation that loops if necessary to ensure we never overflow accumulators and then silently produce garbage results. Make the (non-public) linear regression function available for unit testing by putting it in a separate source file the test can include. Add a unit test that the new regression function produces sensible results for several inputs taken from real-world captures.
This commit is contained in:
Jan Schmidt
parent
f9f45834e7
commit
81d613694c
5 changed files with 451 additions and 128 deletions
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@ -67,6 +67,7 @@ libgstreamer_@GST_API_VERSION@_la_SOURCES = \
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gstcapsfeatures.c \
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gstchildproxy.c \
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gstclock.c \
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gstclock-linreg.c \
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gstcontext.c \
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gstcontrolbinding.c \
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gstcontrolsource.c \
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@ -180,6 +180,12 @@ gint __gst_date_time_compare (const GstDateTime * dt1, const GstDateTime * dt2);
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G_GNUC_INTERNAL
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gchar * __gst_date_time_serialize (GstDateTime * datetime, gboolean with_usecs);
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/* Non-static, for access from the testsuite, but not for external use */
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gboolean
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_priv_gst_do_linear_regression (GstClockTime *times, guint n,
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GstClockTime * m_num, GstClockTime * m_denom, GstClockTime * b,
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GstClockTime * xbase, gdouble * r_squared);
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#ifndef GST_DISABLE_REGISTRY
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/* Secret variable to initialise gst without registry cache */
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GST_EXPORT gboolean _gst_disable_registry_cache;
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241
gst/gstclock-linreg.c
Normal file
241
gst/gstclock-linreg.c
Normal file
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@ -0,0 +1,241 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2004 Wim Taymans <wim@fluendo.com>
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* 2015 Jan Schmidt <jan@centricular.com>
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*
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* gstclock-linreg.c: Linear regression implementation, used in clock slaving
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "gst_private.h"
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#include <time.h>
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#include "gstclock.h"
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#include "gstinfo.h"
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#include "gstutils.h"
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#include "glib-compat-private.h"
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/* Compute log2 of the passed 64-bit number by finding the highest set bit */
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static guint
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gst_log2 (GstClockTime in)
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{
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const guint64 b[] =
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{ 0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000, 0xFFFFFFFF00000000LL };
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const guint64 S[] = { 1, 2, 4, 8, 16, 32 };
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int i;
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guint count = 0;
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for (i = 5; i >= 0; i--) {
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if (in & b[i]) {
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in >>= S[i];
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count |= S[i];
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}
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}
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return count;
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}
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/* http://mathworld.wolfram.com/LeastSquaresFitting.html
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* with SLAVE_LOCK
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*/
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gboolean
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_priv_gst_do_linear_regression (GstClockTime * times, guint n,
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GstClockTime * m_num, GstClockTime * m_denom, GstClockTime * b,
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GstClockTime * xbase, gdouble * r_squared)
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{
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GstClockTime *newx, *newy;
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GstClockTime xmin, ymin, xbar, ybar, xbar4, ybar4;
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GstClockTime xmax, ymax;
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GstClockTimeDiff sxx, sxy, syy;
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GstClockTime *x, *y;
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gint i, j;
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gint pshift = 0;
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gint max_bits;
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xbar = ybar = sxx = syy = sxy = 0;
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x = times;
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y = times + 2;
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xmin = ymin = G_MAXUINT64;
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xmax = ymax = 0;
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for (i = j = 0; i < n; i++, j += 4) {
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xmin = MIN (xmin, x[j]);
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ymin = MIN (ymin, y[j]);
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xmax = MAX (xmax, x[j]);
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ymax = MAX (ymax, y[j]);
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}
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newx = times + 1;
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newy = times + 3;
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/* strip off unnecessary bits of precision */
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for (i = j = 0; i < n; i++, j += 4) {
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newx[j] = x[j] - xmin;
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newy[j] = y[j] - ymin;
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}
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "reduced numbers:");
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for (i = j = 0; i < n; i++, j += 4)
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock,
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" %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT, newx[j], newy[j]);
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#endif
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/* have to do this precisely otherwise the results are pretty much useless.
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* should guarantee that none of these accumulators can overflow */
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/* quantities on the order of 1e10 to 1e13 -> 30-35 bits;
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* window size a max of 2^10, so
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this addition could end up around 2^45 or so -- ample headroom */
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for (i = j = 0; i < n; i++, j += 4) {
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/* Just in case assumptions about headroom prove false, let's check */
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if ((newx[j] > 0 && G_MAXUINT64 - xbar <= newx[j]) ||
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(newy[j] > 0 && G_MAXUINT64 - ybar <= newy[j])) {
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GST_CAT_WARNING_OBJECT (GST_CAT_CLOCK, clock,
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"Regression overflowed in clock slaving! xbar %"
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G_GUINT64_FORMAT " newx[j] %" G_GUINT64_FORMAT " ybar %"
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G_GUINT64_FORMAT " newy[j] %" G_GUINT64_FORMAT, xbar, newx[j], ybar,
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newy[j]);
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return FALSE;
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}
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xbar += newx[j];
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ybar += newy[j];
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}
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xbar /= n;
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ybar /= n;
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/* multiplying directly would give quantities on the order of 1e20-1e26 ->
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* 60 bits to 70 bits times the window size that's 80 which is too much.
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* Instead we (1) subtract off the xbar*ybar in the loop instead of after,
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* to avoid accumulation; (2) shift off some estimated number of bits from
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* each multiplicand to limit the expected ceiling. For strange
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* distributions of input values, things can still overflow, in which
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* case we drop precision and retry - at most a few times, in practice rarely
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*/
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/* Guess how many bits we might need for the usual distribution of input,
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* with a fallback loop that drops precision if things go pear-shaped */
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max_bits = gst_log2 (MAX (xmax - xmin, ymax - ymin)) * 7 / 8 + gst_log2 (n);
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if (max_bits > 64)
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pshift = max_bits - 64;
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i = 0;
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do {
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock,
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"Restarting regression with precision shift %u", pshift);
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#endif
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xbar4 = xbar >> pshift;
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ybar4 = ybar >> pshift;
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sxx = syy = sxy = 0;
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for (i = j = 0; i < n; i++, j += 4) {
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GstClockTime newx4, newy4;
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GstClockTimeDiff tmp;
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newx4 = newx[j] >> pshift;
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newy4 = newy[j] >> pshift;
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tmp = (newx4 + xbar4) * (newx4 - xbar4);
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if (G_UNLIKELY (tmp > 0 && sxx > 0 && (G_MAXINT64 - sxx <= tmp))) {
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do {
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/* Drop some precision and restart */
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pshift++;
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sxx /= 4;
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tmp /= 4;
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} while (G_MAXINT64 - sxx <= tmp);
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break;
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} else if (G_UNLIKELY (tmp < 0 && sxx < 0 && (G_MAXINT64 - sxx >= tmp))) {
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do {
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/* Drop some precision and restart */
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pshift++;
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sxx /= 4;
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tmp /= 4;
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} while (G_MININT64 - sxx >= tmp);
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break;
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}
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sxx += tmp;
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tmp = newy4 * newy4 - ybar4 * ybar4;
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if (G_UNLIKELY (tmp > 0 && syy > 0 && (G_MAXINT64 - syy <= tmp))) {
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do {
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pshift++;
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syy /= 4;
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tmp /= 4;
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} while (G_MAXINT64 - syy <= tmp);
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break;
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} else if (G_UNLIKELY (tmp < 0 && syy < 0 && (G_MAXINT64 - syy >= tmp))) {
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do {
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pshift++;
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syy /= 4;
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tmp /= 4;
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} while (G_MININT64 - syy >= tmp);
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break;
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}
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syy += tmp;
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tmp = newx4 * newy4 - xbar4 * ybar4;
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if (G_UNLIKELY (tmp > 0 && sxy > 0 && (G_MAXINT64 - sxy <= tmp))) {
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do {
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pshift++;
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sxy /= 4;
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tmp /= 4;
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} while (G_MAXINT64 - sxy <= tmp);
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break;
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} else if (G_UNLIKELY (tmp < 0 && sxy < 0 && (G_MININT64 - sxy >= tmp))) {
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do {
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pshift++;
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sxy /= 4;
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tmp /= 4;
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} while (G_MININT64 - sxy >= tmp);
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break;
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}
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sxy += tmp;
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}
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} while (i < n);
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if (G_UNLIKELY (sxx == 0))
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goto invalid;
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*m_num = sxy;
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*m_denom = sxx;
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*xbase = xmin;
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*b = (ybar + ymin) - gst_util_uint64_scale (xbar, *m_num, *m_denom);
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*r_squared = ((double) sxy * (double) sxy) / ((double) sxx * (double) syy);
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " m = %g",
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((double) *m_num) / *m_denom);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " b = %" G_GUINT64_FORMAT,
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*b);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " xbase = %" G_GUINT64_FORMAT,
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*xbase);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " r2 = %g", *r_squared);
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#endif
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return TRUE;
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invalid:
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{
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "sxx == 0, regression failed");
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return FALSE;
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}
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}
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132
gst/gstclock.c
132
gst/gstclock.c
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@ -100,7 +100,6 @@
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* defines the minimum number of samples before the calibration is performed.
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*/
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#include "gst_private.h"
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#include <time.h>
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@ -1262,132 +1261,6 @@ gst_clock_get_master (GstClock * clock)
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return result;
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}
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/* http://mathworld.wolfram.com/LeastSquaresFitting.html
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* with SLAVE_LOCK
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*/
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static gboolean
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do_linear_regression (GstClock * clock, GstClockTime * m_num,
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GstClockTime * m_denom, GstClockTime * b, GstClockTime * xbase,
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gdouble * r_squared)
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{
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GstClockTime *newx, *newy;
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GstClockTime xmin, ymin, xbar, ybar, xbar4, ybar4;
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GstClockTimeDiff sxx, sxy, syy;
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GstClockTime *x, *y;
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gint i, j;
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guint n;
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GstClockPrivate *priv;
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xbar = ybar = sxx = syy = sxy = 0;
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priv = clock->priv;
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x = priv->times;
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y = priv->times + 2;
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n = priv->filling ? priv->time_index : priv->window_size;
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "doing regression on:");
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for (i = j = 0; i < n; i++, j += 4)
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock,
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" %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT, x[j], y[j]);
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#endif
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xmin = ymin = G_MAXUINT64;
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for (i = j = 0; i < n; i++, j += 4) {
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xmin = MIN (xmin, x[j]);
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ymin = MIN (ymin, y[j]);
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}
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "min x: %" G_GUINT64_FORMAT,
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xmin);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "min y: %" G_GUINT64_FORMAT,
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ymin);
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#endif
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newx = priv->times + 1;
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newy = priv->times + 3;
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/* strip off unnecessary bits of precision */
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for (i = j = 0; i < n; i++, j += 4) {
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newx[j] = x[j] - xmin;
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newy[j] = y[j] - ymin;
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}
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "reduced numbers:");
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for (i = j = 0; i < n; i++, j += 4)
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock,
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" %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT, newx[j], newy[j]);
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#endif
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/* have to do this precisely otherwise the results are pretty much useless.
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* should guarantee that none of these accumulators can overflow */
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/* quantities on the order of 1e10 -> 30 bits; window size a max of 2^10, so
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this addition could end up around 2^40 or so -- ample headroom */
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for (i = j = 0; i < n; i++, j += 4) {
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xbar += newx[j];
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ybar += newy[j];
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}
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xbar /= n;
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ybar /= n;
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " xbar = %" G_GUINT64_FORMAT,
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xbar);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " ybar = %" G_GUINT64_FORMAT,
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ybar);
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#endif
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/* multiplying directly would give quantities on the order of 1e20 -> 60 bits;
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times the window size that's 70 which is too much. Instead we (1) subtract
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off the xbar*ybar in the loop instead of after, to avoid accumulation; (2)
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shift off 4 bits from each multiplicand, giving an expected ceiling of 52
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bits, which should be enough. Need to check the incoming range and domain
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to ensure this is an appropriate loss of precision though. */
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xbar4 = xbar >> 4;
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ybar4 = ybar >> 4;
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for (i = j = 0; i < n; i++, j += 4) {
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GstClockTime newx4, newy4;
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newx4 = newx[j] >> 4;
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newy4 = newy[j] >> 4;
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sxx += newx4 * newx4 - xbar4 * xbar4;
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syy += newy4 * newy4 - ybar4 * ybar4;
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sxy += newx4 * newy4 - xbar4 * ybar4;
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}
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if (G_UNLIKELY (sxx == 0))
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goto invalid;
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*m_num = sxy;
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*m_denom = sxx;
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*xbase = xmin;
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*b = (ybar + ymin) - gst_util_uint64_scale (xbar, *m_num, *m_denom);
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*r_squared = ((double) sxy * (double) sxy) / ((double) sxx * (double) syy);
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#ifdef DEBUGGING_ENABLED
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " m = %g",
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((double) *m_num) / *m_denom);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " b = %" G_GUINT64_FORMAT,
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*b);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " xbase = %" G_GUINT64_FORMAT,
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*xbase);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, " r2 = %g", *r_squared);
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#endif
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return TRUE;
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invalid:
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{
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "sxx == 0, regression failed");
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return FALSE;
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}
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}
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/**
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* gst_clock_add_observation:
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* @clock: a #GstClock
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@ -1455,6 +1328,7 @@ gst_clock_add_observation_unapplied (GstClock * clock, GstClockTime slave,
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{
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GstClockTime m_num, m_denom, b, xbase;
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GstClockPrivate *priv;
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guint n;
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g_return_val_if_fail (GST_IS_CLOCK (clock), FALSE);
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g_return_val_if_fail (r_squared != NULL, FALSE);
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@ -1479,7 +1353,9 @@ gst_clock_add_observation_unapplied (GstClock * clock, GstClockTime slave,
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if (G_UNLIKELY (priv->filling && priv->time_index < priv->window_threshold))
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goto filling;
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|
||||
if (!do_linear_regression (clock, &m_num, &m_denom, &b, &xbase, r_squared))
|
||||
n = priv->filling ? priv->time_index : priv->window_size;
|
||||
if (!_priv_gst_do_linear_regression (priv->times, n, &m_num, &m_denom, &b,
|
||||
&xbase, r_squared))
|
||||
goto invalid;
|
||||
|
||||
GST_CLOCK_SLAVE_UNLOCK (clock);
|
||||
|
|
|
|||
|
|
@ -17,6 +17,8 @@
|
|||
* Boston, MA 02110-1301, USA.
|
||||
*/
|
||||
|
||||
/* Include the non-public linear regression function */
|
||||
#include "../../gst/gstclock-linreg.c"
|
||||
#include <gst/check/gstcheck.h>
|
||||
|
||||
typedef struct
|
||||
|
|
@ -109,6 +111,202 @@ GST_START_TEST (test_set_master_refcount)
|
|||
|
||||
GST_END_TEST;
|
||||
|
||||
GstClockTime times1[] = {
|
||||
257116899087539, 0, 120632754291904, 0,
|
||||
257117935914250, 0, 120633825367344, 0,
|
||||
257119448289434, 0, 120635306141271, 0,
|
||||
257120493671524, 0, 120636384357825, 0,
|
||||
257121550784861, 0, 120637417438878, 0,
|
||||
257123042669403, 0, 120638895344150, 0,
|
||||
257124089184865, 0, 120639971729651, 0,
|
||||
257125545836474, 0, 120641406788243, 0,
|
||||
257127030618490, 0, 120642885914220, 0,
|
||||
257128033712770, 0, 120643888843907, 0,
|
||||
257129081768074, 0, 120644981892002, 0,
|
||||
257130145383845, 0, 120646016376867, 0,
|
||||
257131532530200, 0, 120647389850987, 0,
|
||||
257132578136034, 0, 120648472767247, 0,
|
||||
257134102475722, 0, 120649953785315, 0,
|
||||
257135142994788, 0, 120651028858556, 0,
|
||||
257136585079868, 0, 120652441303624, 0,
|
||||
257137618260656, 0, 120653491627112, 0,
|
||||
257139108694546, 0, 120654963978184, 0,
|
||||
257140644022048, 0, 120656500233068, 0,
|
||||
257141685671825, 0, 120657578510655, 0,
|
||||
257142741238288, 0, 120658610889805, 0,
|
||||
257144243633074, 0, 120660093098060, 0,
|
||||
257145287962271, 0, 120661172901525, 0,
|
||||
257146740596716, 0, 120662591572179, 0,
|
||||
257147757607150, 0, 120663622822179, 0,
|
||||
257149263992401, 0, 120665135578527, 0,
|
||||
257150303719290, 0, 120666176166905, 0,
|
||||
257151355569906, 0, 120667217304601, 0,
|
||||
257152430578406, 0, 120668326099768, 0,
|
||||
257153490501095, 0, 120669360554111, 0,
|
||||
257154512360784, 0, 120670365497960, 0,
|
||||
257155530610577, 0, 120671399006259, 0,
|
||||
257156562091659, 0, 120672432728185, 0,
|
||||
257157945388742, 0, 120673800312414, 0,
|
||||
257159287547073, 0, 120675142444983, 0,
|
||||
257160324912880, 0, 120676215076817, 0,
|
||||
257345408328042, 0, 120861261738196, 0,
|
||||
257346412270919, 0, 120862265613926, 0,
|
||||
257347420532284, 0, 120863278644933, 0,
|
||||
257348431187638, 0, 120864284412754, 0,
|
||||
257349439018028, 0, 120865293110265, 0,
|
||||
257351796217938, 0, 120867651111973, 0,
|
||||
257352803038092, 0, 120868659107578, 0,
|
||||
257354152688899, 0, 120870008594883, 0,
|
||||
257355157088906, 0, 120871011097327, 0,
|
||||
257356162439182, 0, 120872016346348, 0,
|
||||
257357167872040, 0, 120873021656407, 0,
|
||||
257358182440058, 0, 120874048633945, 0,
|
||||
257359198881356, 0, 120875052265538, 0,
|
||||
257100756525466, 0, 120616619282139, 0,
|
||||
257101789337770, 0, 120617655475988, 0,
|
||||
257102816323472, 0, 120618674000157, 0,
|
||||
257103822485250, 0, 120619679005039, 0,
|
||||
257104840760423, 0, 120620710743321, 0,
|
||||
257105859459496, 0, 120621715351476, 0,
|
||||
257106886662470, 0, 120622764942539, 0,
|
||||
257108387497864, 0, 120624244221106, 0,
|
||||
257109428859191, 0, 120625321461096, 0,
|
||||
257110485892785, 0, 120626356892003, 0,
|
||||
257111869872141, 0, 120627726459874, 0,
|
||||
257112915903774, 0, 120628813190830, 0,
|
||||
257114329982208, 0, 120630187061682, 0,
|
||||
257115376666026, 0, 120631271992101, 0
|
||||
};
|
||||
|
||||
|
||||
GstClockTime times2[] = {
|
||||
291678579009762, 0, 162107345029507, 0,
|
||||
291679770464405, 0, 162108597684538, 0,
|
||||
291680972924370, 0, 162109745816863, 0,
|
||||
291682278949629, 0, 162111000577605, 0,
|
||||
291683590706117, 0, 162112357724822, 0,
|
||||
291684792322541, 0, 162113613156950, 0,
|
||||
291685931362506, 0, 162114760556854, 0,
|
||||
291687132156589, 0, 162115909238493, 0,
|
||||
291688265012060, 0, 162117120603240, 0,
|
||||
291689372183047, 0, 162118126279508, 0,
|
||||
291705506022294, 0, 162134329373992, 0,
|
||||
291667914301004, 0, 162096795553658, 0,
|
||||
291668119537668, 0, 162096949051905, 0,
|
||||
291668274671455, 0, 162097049238371, 0,
|
||||
291668429435600, 0, 162097256356719, 0,
|
||||
291668586128535, 0, 162097355689763, 0,
|
||||
291668741306233, 0, 162097565678460, 0,
|
||||
291668893789203, 0, 162097661044916, 0,
|
||||
291669100256555, 0, 162097865694145, 0,
|
||||
291669216417563, 0, 162098069214693, 0,
|
||||
291669836394620, 0, 162098677275530, 0,
|
||||
291669990447821, 0, 162098792601263, 0,
|
||||
291670149426086, 0, 162098916899184, 0,
|
||||
291670300232152, 0, 162099114225621, 0,
|
||||
291670411261917, 0, 162099236784112, 0,
|
||||
291670598483507, 0, 162099402158751, 0,
|
||||
291671716582687, 0, 162100558744122, 0,
|
||||
291672600759788, 0, 162101499326359, 0,
|
||||
291673919988307, 0, 162102751981384, 0,
|
||||
291675174441643, 0, 162104005551939, 0,
|
||||
291676271562197, 0, 162105105252898, 0,
|
||||
291677376345374, 0, 162106195737516, 0
|
||||
};
|
||||
|
||||
GstClockTime times3[] = {
|
||||
291881924291688, 0, 162223997578228, 0,
|
||||
291883318122262, 0, 162224167198360, 0,
|
||||
291884786394838, 0, 162224335172501, 0,
|
||||
291886004374386, 0, 162224503695531, 0,
|
||||
291887224353285, 0, 162224673560021, 0,
|
||||
291888472403367, 0, 162224843760361, 0,
|
||||
291889727977561, 0, 162225014479362, 0,
|
||||
291890989982306, 0, 162225174554558, 0,
|
||||
291892247875763, 0, 162225339753039, 0,
|
||||
291893502163547, 0, 162225673230987, 0,
|
||||
291894711382216, 0, 162225829494101, 0,
|
||||
291895961021506, 0, 162225964530832, 0,
|
||||
291897251690854, 0, 162226127287981, 0,
|
||||
291898508630785, 0, 162226303710406, 0,
|
||||
291899740172868, 0, 162226472478047, 0,
|
||||
291900998878873, 0, 162226637402085, 0,
|
||||
291902334919875, 0, 162226797873245, 0,
|
||||
291903572196610, 0, 162226964352963, 0,
|
||||
291904727342699, 0, 162227125312525, 0,
|
||||
291906071189108, 0, 162228361337153, 0,
|
||||
291907308146005, 0, 162229560625638, 0,
|
||||
291908351925126, 0, 162230604986650, 0,
|
||||
291909396411423, 0, 162231653690543, 0,
|
||||
291910453965348, 0, 162232698550995, 0,
|
||||
291912096870744, 0, 162233475264947, 0,
|
||||
291913234148395, 0, 162233606516855, 0,
|
||||
291915448096576, 0, 162233921145559, 0,
|
||||
291916707748827, 0, 162234047154298, 0,
|
||||
291918737451070, 0, 162234370837425, 0,
|
||||
291919896016205, 0, 162234705504337, 0,
|
||||
291921098663980, 0, 162234872320397, 0,
|
||||
291922315691409, 0, 162235031023366, 0
|
||||
};
|
||||
|
||||
struct test_entry
|
||||
{
|
||||
gint n;
|
||||
GstClockTime *v;
|
||||
GstClockTime expect_internal;
|
||||
GstClockTime expect_external;
|
||||
guint64 expect_num;
|
||||
guint64 expect_denom;
|
||||
} times[] = {
|
||||
{
|
||||
32, times1, 257116899087539, 120632768833649, 4052622913376634109,
|
||||
4052799313904261962}, {
|
||||
64, times1, 257100756525466, 120616627179145, 2011895759027682422,
|
||||
2012014931360215503}, {
|
||||
32, times2, 291667914301004, 162096729345562, 2319535707505209857,
|
||||
2321009753483354451}, {
|
||||
32, times3, 291881924291688, 162222328334994, 1370930728180888261,
|
||||
4392719527011673456}
|
||||
};
|
||||
|
||||
GST_START_TEST (test_regression)
|
||||
{
|
||||
GstClockTime m_num, m_den, internal, external;
|
||||
gdouble r_squared, rate, expect_rate;
|
||||
gint i;
|
||||
|
||||
for (i = 0; i < G_N_ELEMENTS (times); i++) {
|
||||
fail_unless (_priv_gst_do_linear_regression (times[i].v, times[i].n,
|
||||
&m_num, &m_den, &external, &internal, &r_squared));
|
||||
|
||||
GST_LOG ("xbase %" G_GUINT64_FORMAT " ybase %" G_GUINT64_FORMAT " rate = %"
|
||||
G_GUINT64_FORMAT " / %" G_GUINT64_FORMAT " = %.10f r_squared %f\n",
|
||||
internal, external, m_num, m_den, (gdouble) (m_num) / (m_den),
|
||||
r_squared);
|
||||
|
||||
/* Require high correlation */
|
||||
fail_unless (r_squared >= 0.9);
|
||||
|
||||
fail_unless (internal == times[i].expect_internal,
|
||||
"Regression params %d fail. internal %" G_GUINT64_FORMAT
|
||||
" != expected %" G_GUINT64_FORMAT, i, internal,
|
||||
times[i].expect_internal);
|
||||
/* Rate must be within 1% tolerance */
|
||||
expect_rate = ((gdouble) (times[i].expect_num) / times[i].expect_denom);
|
||||
rate = ((gdouble) (m_num) / m_den);
|
||||
fail_unless ((expect_rate - rate) >= -0.1 && (expect_rate - rate) <= 0.1,
|
||||
"Regression params %d fail. Rate out of range. Expected %f, got %f",
|
||||
i, expect_rate, rate);
|
||||
fail_unless (external >= times[i].expect_external * 0.95 &&
|
||||
external <= times[i].expect_internal * 1.05,
|
||||
"Regression params %d fail. external %" G_GUINT64_FORMAT
|
||||
" != expected %" G_GUINT64_FORMAT, i, external,
|
||||
times[i].expect_external);
|
||||
}
|
||||
}
|
||||
|
||||
GST_END_TEST;
|
||||
|
||||
static Suite *
|
||||
gst_clock_suite (void)
|
||||
{
|
||||
|
|
@ -117,6 +315,7 @@ gst_clock_suite (void)
|
|||
|
||||
suite_add_tcase (s, tc_chain);
|
||||
tcase_add_test (tc_chain, test_set_master_refcount);
|
||||
tcase_add_test (tc_chain, test_regression);
|
||||
|
||||
return s;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue