add better time interpolator: use linear regression to determine gradient from

measurements, predict a short distance ahead, and smoothen estimation function
with 3rd degree spline interpolation.



git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1949 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 37 insertions, 0 deletions

diff --git a/src/pulsecore/time-smoother.h b/src/pulsecore/time-smoother.h
new file mode 100644
index 00000000..038b7ae4
--- /dev/null
+++ b/src/pulsecore/time-smoother.h
@@ -0,0 +1,37 @@
+#ifndef foopulsetimesmootherhfoo
+#define foopulsetimesmootherhfoo
+
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2007 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <pulsecore/macro.h>
+#include <pulse/sample.h>
+
+typedef struct pa_smoother pa_smoother;
+
+pa_smoother* pa_smoother_new(pa_usec_t adjust_x, pa_usec_t history_x, pa_bool_t monotonic);
+
+void pa_smoother_put(pa_smoother *s, pa_usec_t x, pa_usec_t y);
+pa_usec_t pa_smoother_get(pa_smoother *s, pa_usec_t x);
+
+#endif