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add ability to "pause" the input time temporarily. don't accidently overwrite variables we still need.

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1958 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2007-10-27 15:48:01 +00:00
parent 55e4a3e221
commit 581e7f1802
2 changed files with 64 additions and 4 deletions
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61
src/pulsecore/time-smoother.c
View file

@ -34,7 +34,7 @@
#include "time-smoother.h"
#define HISTORY_MAX 100
#define HISTORY_MAX 50
/*
* Implementation of a time smoothing algorithm to synchronize remote
@ -63,6 +63,8 @@ struct pa_smoother {
pa_usec_t adjust_time, history_time;
pa_bool_t monotonic;
pa_usec_t time_offset;
pa_usec_t px, py; /* Point p, where we want to reach stability */
double dp; /* Gradient we want at point p */
@ -79,6 +81,9 @@ struct pa_smoother {
/* Cached parameters for our interpolation polynomial y=ax^3+b^2+cx */
double a, b, c;
pa_bool_t abc_valid;
pa_bool_t paused;
pa_usec_t pause_time;
};
pa_smoother* pa_smoother_new(pa_usec_t adjust_time, pa_usec_t history_time, pa_bool_t monotonic) {
@ -90,6 +95,7 @@ pa_smoother* pa_smoother_new(pa_usec_t adjust_time, pa_usec_t history_time, pa_b
s = pa_xnew(pa_smoother, 1);
s->adjust_time = adjust_time;
s->history_time = history_time;
s->time_offset = 0;
s->monotonic = monotonic;
s->px = s->py = 0;
@ -105,6 +111,8 @@ pa_smoother* pa_smoother_new(pa_usec_t adjust_time, pa_usec_t history_time, pa_b
s->abc_valid = FALSE;
s->paused = FALSE;
return s;
}
@ -293,12 +301,24 @@ static void estimate(pa_smoother *s, pa_usec_t x, pa_usec_t *y, double *deriv) {
}
void pa_smoother_put(pa_smoother *s, pa_usec_t x, pa_usec_t y) {
pa_usec_t ney;
double nde;
pa_assert(s);
pa_assert(x >= s->time_offset);
/* Fix up x value */
if (s->paused)
x = s->pause_time;
else
x -= s->time_offset;
pa_assert(x >= s->ex);
/* First, we calculate the position we'd estimate for x, so that
* we can adjust our position smoothly from this one */
estimate(s, x, &s->ey, &s->de);
s->ex = x;
estimate(s, x, &ney, &nde);
s->ex = x; s->ey = ney; s->de = nde;
/* Then, we add the new measurement to our history */
add_to_history(s, x, y);
@ -317,7 +337,42 @@ pa_usec_t pa_smoother_get(pa_smoother *s, pa_usec_t x) {
pa_usec_t y;
pa_assert(s);
pa_assert(x >= s->time_offset);
/* Fix up x value */
if (s->paused)
x = s->pause_time;
else
x -= s->time_offset;
pa_assert(x >= s->ex);
estimate(s, x, &y, NULL);
return y;
}
void pa_smoother_set_time_offset(pa_smoother *s, pa_usec_t offset) {
pa_assert(s);
s->time_offset = offset;
}
void pa_smoother_pause(pa_smoother *s, pa_usec_t x) {
pa_assert(s);
if (s->paused)
return;
s->paused = TRUE;
s->pause_time = x;
}
void pa_smoother_resume(pa_smoother *s, pa_usec_t x) {
pa_assert(s);
if (!s->paused)
return;
s->paused = FALSE;
s->time_offset += x - s->pause_time;
}

7
src/pulsecore/time-smoother.h
View file

@ -29,10 +29,15 @@
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);
pa_smoother* pa_smoother_new(pa_usec_t adjust_time, pa_usec_t history_time, pa_bool_t monotonic);
void pa_smoother_free(pa_smoother* s);
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);
void pa_smoother_set_time_offset(pa_smoother *s, pa_usec_t offset);
void pa_smoother_pause(pa_smoother *s, pa_usec_t x);
void pa_smoother_resume(pa_smoother *s, pa_usec_t x);
#endif