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make provided clock run in sync

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Original commit message from CVS:
make provided clock run in sync
This commit is contained in:
Thomas Vander Stichele 2004-06-25 17:11:32 +00:00
parent 078ad9c68b
commit 42d83d0474
2 changed files with 48 additions and 5 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2004-06-25 Thomas Vander Stichele <thomas at apestaart dot org>
* ext/alsa/gstalsasrc.c: (gst_alsa_src_init),
(gst_alsa_src_get_time), (gst_alsa_src_loop),
(gst_alsa_src_change_state):
return a time that is in sync with the element's processing
2004-06-25 Wim Taymans <wim@fluendo.com>
* gst/tcp/gsttcpserversink.c: (gst_tcpserversink_class_init),

46
ext/alsa/gstalsasrc.c
View file

@ -134,17 +134,51 @@ gst_alsa_src_init (GstAlsaSrc * src)
gst_object_ref (GST_OBJECT (this->clock));
gst_object_sink (GST_OBJECT (this->clock));
src->status = NULL;
gst_element_set_loop_function (GST_ELEMENT (this), gst_alsa_src_loop);
}
/* alsasrc provides a clock starting from the trigger tstamp
* (last play/pause/stop), and added to that the time for the currently
* processed samples, and the current fill state of the buffer */
static GstClockTime
gst_alsa_src_get_time (GstAlsa * this)
{
struct timeval trigger;
snd_pcm_sframes_t delay;
GstClockTime gct_trigger, gct_captured, gct_delay, retval =
GST_CLOCK_TIME_NONE;
int err;
GstAlsaSrc *src = GST_ALSA_SRC (this);
GTimeVal now;
g_get_current_time (&now);
return GST_TIMEVAL_TO_TIME (now);
if (src->status == NULL)
return GST_CLOCK_TIME_NONE;
if ((err = snd_pcm_status (this->handle, src->status)) < 0) {
GST_ERROR_OBJECT (this, "status error: %s", snd_strerror (err));
return GST_CLOCK_TIME_NONE;
}
/* trigger tstamp is the last time the device got started/stopped/paused */
snd_pcm_status_get_trigger_tstamp (src->status, &trigger);
gct_trigger = GST_TIMEVAL_TO_TIME (trigger);
/* captured is the number of samples already sent out as buffers */
gct_captured = gst_alsa_samples_to_timestamp (this, this->captured);
/* delay is the number of samples in the buffer not yet processed */
delay = snd_pcm_status_get_delay (src->status);
gct_delay = gst_alsa_samples_to_timestamp (this, delay);
retval = gct_trigger + gct_captured + gct_delay;
GST_LOG_OBJECT (src, "returning clock time of %" GST_TIME_FORMAT,
GST_TIME_ARGS (retval));
return retval;
}
static int
@ -388,13 +422,11 @@ gst_alsa_src_loop (GstElement * element)
gint outsize;
GstClockTime outtime, outdur, outreal, outideal, startalsa, outalsa;
gint64 diff, offset;
snd_pcm_status_t *status;
struct timeval tstamp;
int err;
snd_pcm_status_alloca (&status);
if ((err = snd_pcm_status (this->handle, status)) < 0)
if ((err = snd_pcm_status (this->handle, src->status)) < 0)
GST_ERROR_OBJECT (this, "status error: %s", snd_strerror (err));
offset = this->captured;
@ -408,7 +440,7 @@ gst_alsa_src_loop (GstElement * element)
/* ideal time is counting samples */
outideal = gst_alsa_samples_to_timestamp (this, offset);
snd_pcm_status_get_trigger_tstamp (status, &tstamp);
snd_pcm_status_get_trigger_tstamp (src->status, &tstamp);
startalsa = GST_TIMEVAL_TO_TIME (tstamp) - element->base_time;
outalsa = startalsa + outideal;
@ -473,13 +505,17 @@ gst_alsa_src_change_state (GstElement * element)
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
snd_pcm_status_malloc (&src->status);
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
snd_pcm_status_free (src->status);
src->status = NULL;
gst_alsa_src_flush (src);
break;
case GST_STATE_READY_TO_NULL: