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niimaqsrc: Move start of acquisition to GstBaseSrc.create from GstBaseSrc.start

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This ensures that we can immediately push out buffers.
This commit is contained in:
Joshua M. Doe 2010-04-21 09:35:10 -04:00
parent 1a8eaf552c
commit 2fd940a13e
2 changed files with 43 additions and 28 deletions
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69
sys/gstniimaq.c
View File

@ -461,6 +461,7 @@ gst_niimaq_init (GstNiImaq * src, GstNiImaqClass * g_class)
src->iid = 0;
src->camera_name = g_strdup (DEFAULT_PROP_INTERFACE);
src->interface_name = g_strdup (DEFAULT_PROP_INTERFACE);
src->session_started = FALSE;
}
@ -606,16 +607,51 @@ gst_niimaq_get_times (GstBaseSrc * basesrc, GstBuffer * buffer,
static GstFlowReturn
gst_niimaq_create (GstPushSrc * psrc, GstBuffer ** buffer)
{
GstNiImaq *src;
GstNiImaq *src = GST_NIIMAQ (psrc);
gpointer data;
GstCaps *caps;
GstFlowReturn res = GST_FLOW_OK;
guint i;
uInt32 copied_number;
uInt32 copied_index;
Int32 rval;
uInt32 dropped;
/* start the IMAQ acquisition session if we haven't done so yet */
if (!src->session_started) {
GST_DEBUG_OBJECT (src, "Starting acquisition");
src = GST_NIIMAQ (psrc);
/* try to open the camera five times */
for (i = 0; i < 5; i++) {
rval = imgSessionStartAcquisition (src->sid);
if (rval == 0) {
break;
}
else {
GST_LOG_OBJECT (src, "camera is still off , wait 50ms and retry");
g_usleep (50000);
}
}
/* we tried five times and failed, so we error */
if (i >= 5) {
GST_ELEMENT_ERROR (src, RESOURCE, FAILED,
("Camera doesn't seem to want to turn on!"),
("Camera doesn't seem to want to turn on!"));
if (src->sid)
imgClose (src->sid,TRUE);
src->sid = 0;
if (src->iid)
imgClose (src->iid,TRUE);
src->iid = 0;
return GST_FLOW_ERROR;
}
src->session_started = TRUE;
}
data = g_malloc(src->framesize);
@ -924,30 +960,6 @@ gst_niimaq_start (GstBaseSrc * src)
goto error;
}*/
/* start acquisition */
/* TODO: move this to create so we can retrieve frames immediately */
rval=imgSessionStartAcquisition (filter->sid);
/* Try to open the camera several times */
i = 0;
while (rval != 0 && i++ < 5) {
g_usleep (50000);
if (rval=imgSessionStartAcquisition (filter->sid)) {
if (rval != 0) {
GST_LOG_OBJECT (src, "camera is still off , retrying");
}
}
}
if (i >= 5) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED,
("Camera doesn't seem to want to turn on!"),
("Camera doesn't seem to want to turn on!"));
goto error;
}
GST_LOG_OBJECT (filter, "Starting acquisition");
return TRUE;
error:
@ -974,15 +986,16 @@ error:
static gboolean
gst_niimaq_stop (GstBaseSrc * src)
{
GstNiImaq* filter = GST_NIIMAQ(src);
GstNiImaq* filter = GST_NIIMAQ (src);
Int32 rval;
/* stop IMAQ session */
rval=imgSessionStopAcquisition(filter->sid);
rval = imgSessionStopAcquisition (filter->sid);
if (rval) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Unable to stop acquisition"),
("Unable to stop acquisition"));
}
filter->session_started = FALSE;
GST_DEBUG_OBJECT (filter, "Acquisition stopped");

2
sys/gstniimaq.h
View File

@ -69,6 +69,8 @@ struct _GstNiImaq {
INTERFACE_ID iid;
SESSION_ID sid;
gboolean session_started;
GstCaps *caps;
};