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some cleanups for video_grabber() which fix a race condition by Jindrich Makovicka <makovick@kmlinux.fjfi.cvut.cz> 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7586 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
alex 2002-10-02 16:47:41 +00:00
parent 53b73363df
commit a83dd2b15c
1 changed files with 26 additions and 22 deletions
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48
libmpdemux/tvi_v4l.c
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@ -1184,7 +1184,7 @@ static void *video_grabber(void *data)
mp_dbg(MSGT_TV, MSGL_DBG3, "\npicture sync failed\n");
prev_interval = 0.0;
prev_skew = priv->audio_skew;
prev_skew = 0.0;
for (;!priv->shutdown;)
{
@ -1209,29 +1209,33 @@ static void *video_grabber(void *data)
priv->starttime = curtime.tv_sec + curtime.tv_usec*.000001;
priv->audio_skew_measure_time = 0;
pthread_mutex_unlock(&priv->audio_starter);
// first frame must always have timestamp of zero
xskew = 0.0;
skew = 0.0;
interval = 0.0;
first = 0;
}
interval = curtime.tv_sec + curtime.tv_usec*.000001 - priv->starttime;
if (!priv->immediate_mode && (
((interval - prev_interval < 1.0/priv->fps*0.85) && interval > 0.0001)
|| (interval - prev_interval > 1.0/priv->fps*1.15) ) ) {
mp_msg(MSGT_TV, MSGL_V, "\nvideo capture thread: frame delta ~ %.1lf fps\n",
1.0/(interval - prev_interval));
}
// interpolate the skew in time
pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > (interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew + (interval - prev_interval)*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -(interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew - (interval - prev_interval)*MAX_SKEW_DELTA;
} else {
skew = xskew;
interval = curtime.tv_sec + curtime.tv_usec*.000001 - priv->starttime;
if (!priv->immediate_mode && (
(interval - prev_interval < 1.0/priv->fps*0.85)
|| (interval - prev_interval > 1.0/priv->fps*1.15) ) ) {
mp_msg(MSGT_TV, MSGL_V, "\nvideo capture thread: frame delta ~ %.1lf fps\n",
1.0/(interval - prev_interval));
}
// interpolate the skew in time
pthread_mutex_lock(&priv->skew_mutex);
xskew = priv->audio_skew + (interval - priv->audio_skew_measure_time)*priv->audio_skew_factor;
pthread_mutex_unlock(&priv->skew_mutex);
// correct extreme skew changes to avoid (especially) moving backwards in time
if (xskew - prev_skew > (interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew + (interval - prev_interval)*MAX_SKEW_DELTA;
} else if (xskew - prev_skew < -(interval - prev_interval)*MAX_SKEW_DELTA) {
skew = prev_skew - (interval - prev_interval)*MAX_SKEW_DELTA;
} else {
skew = xskew;
}
}
mp_msg(MSGT_TV, MSGL_DBG3, "\nfps = %lf, v_interval = %lf, a_skew = %f, corr_skew = %f\n",