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niimaqsrc: Add more inline documentation

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This commit is contained in:
Joshua M. Doe 2010-04-21 08:33:46 -04:00
parent af25506097
commit 45df5409ec
1 changed files with 122 additions and 53 deletions
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175
sys/gstniimaq.c
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@ -352,7 +352,7 @@ gst_niimaq_property_probe_interface_init (GstPropertyProbeInterface * iface)
* gst_niimaq_init_interfaces:
* @type: #GType
*
* Initialize all interfaces
* Initialize all GStreamer interfaces
*/
static void
gst_niimaq_init_interfaces (GType type)
@ -367,6 +367,12 @@ gst_niimaq_init_interfaces (GType type)
GST_TYPE_PROPERTY_PROBE, &niimaq_propertyprobe_info);
}
/**
* gst_niimaq_base_init:
* g_class:
*
* Base GObject initialization
*/
static void
gst_niimaq_base_init (gpointer g_class)
{
@ -378,56 +384,72 @@ gst_niimaq_base_init (gpointer g_class)
gst_static_pad_template_get (&src_factory));
}
/**
* gst_niimaq_class_init:
* klass: #GstNiImaqClass to initialize
*
* Initialize #GstNiImaqClass, which occurs only once no matter how many
* instances of the class there are
*/
static void
gst_niimaq_class_init (GstNiImaqClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *gstbasesrc_class;
GstPushSrcClass *gstpushsrc_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstbasesrc_class = (GstBaseSrcClass *) klass;
gstpushsrc_class = (GstPushSrcClass *) klass;
gstelement_class = (GstElementClass *) klass;
/* get pointers to base classes */
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
GstPushSrcClass *gstpushsrc_class = (GstPushSrcClass *) klass;
/* install GObject vmethod implementations */
gobject_class->dispose = gst_niimaq_dispose;
gobject_class->set_property = gst_niimaq_set_property;
gobject_class->get_property = gst_niimaq_get_property;
/* install GObject properties */
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_INTERFACE, g_param_spec_string ("interface",
"Interface",
"NI-IMAQ interface to open", DEFAULT_PROP_INTERFACE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_TIMESTAMP_OFFSET, g_param_spec_int64 ("timestamp-offset",
"Timestamp offset",
"An offset added to timestamps set on buffers (in ns)", G_MININT64,
G_MAXINT64, DEFAULT_PROP_TIMESTAMP_OFFSET, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_BUFSIZE, g_param_spec_int ("buffer-size",
"The number of frames in the dma ringbuffer",
"The number of frames in the dma ringbuffer", 1,
"Number of frames in the IMAQ ringbuffer",
"The number of frames in the IMAQ ringbuffer", 1,
G_MAXINT, DEFAULT_PROP_BUFSIZE, G_PARAM_READWRITE));
/* install GstBaseSrc vmethod implementations */
gstbasesrc_class->get_caps = gst_niimaq_get_caps;
gstbasesrc_class->set_caps = gst_niimaq_set_caps;
gstbasesrc_class->get_times = gst_niimaq_get_times;
gstpushsrc_class->create = gst_niimaq_create;
gstbasesrc_class->start = gst_niimaq_start;
gstbasesrc_class->stop = gst_niimaq_stop;
/* install GstPushSrc vmethod implementations */
gstpushsrc_class->create = gst_niimaq_create;
}
/**
* gst_niimaq_init:
* src: the #GstNiImaq instance to initialize
* g_class: #GstNiImaqClass
*
* Initialize this instance of #GstNiImaq
*/
static void
gst_niimaq_init (GstNiImaq * src, GstNiImaqClass * g_class)
{
GstPad *srcpad = GST_BASE_SRC_PAD (src);
/* set source as live (no preroll) */
gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
/* force pad to only accept fixed caps */
gst_pad_use_fixed_caps (srcpad);
/* initialize member variables */
src->timestamp_offset = 0;
src->caps = NULL;
src->bufsize = 10;
@ -442,17 +464,24 @@ gst_niimaq_init (GstNiImaq * src, GstNiImaqClass * g_class)
}
/**
* gst_niimaq_dispose:
* object: #GObject to dispose
*
* Disposes of the #GObject as part of object destruction
*/
static void
gst_niimaq_dispose (GObject * object)
{
GstNiImaq *src = GST_NIIMAQ (object);
/* free memory allocated */
g_free (src->camera_name);
src->camera_name = NULL;
g_free (src->interface_name);
src->interface_name = NULL;
/* chain dispose fuction of parent class */
G_OBJECT_CLASS (parent_class)->dispose (object);
}
@ -618,11 +647,11 @@ gst_niimaq_create (GstPushSrc * psrc, GstBuffer ** buffer)
gst_buffer_set_caps (*buffer, caps);
gst_caps_unref (caps);
//GST_BUFFER_TIMESTAMP (outbuf) = src->timestamp_offset + src->running_time;
//if (src->rate_numerator != 0) {
// GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale_int (GST_SECOND,
// src->rate_denominator, src->rate_numerator);
//}
/*GST_BUFFER_TIMESTAMP (outbuf) = src->timestamp_offset + src->running_time;
if (src->rate_numerator != 0) {
GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale_int (GST_SECOND,
src->rate_denominator, src->rate_numerator);
}*/
dropped = newval - src->cumbufnum;
if (dropped > 0) {
@ -634,10 +663,10 @@ gst_niimaq_create (GstPushSrc * psrc, GstBuffer ** buffer)
src->cumbufnum = newval + 1;
src->n_frames++;
//if (src->rate_numerator != 0) {
// src->running_time = gst_util_uint64_scale_int (src->n_frames * GST_SECOND,
// src->rate_denominator, src->rate_numerator);
//}
/*if (src->rate_numerator != 0) {
src->running_time = gst_util_uint64_scale_int (src->n_frames * GST_SECOND,
src->rate_denominator, src->rate_numerator);
}*/
return res;
@ -649,14 +678,13 @@ error:
/**
* gst_niimaq_parse_caps:
* caps: #GstCaps
* caps: a #GstCaps to parse
* width:
* height:
* rate_numerator:
* depth:
* bpp:
*
* Parses a given caps and sets critical values
* Parses a given caps and sets critical values.
*
* Returns: TRUE on success
*/
@ -664,7 +692,7 @@ static gboolean
gst_niimaq_parse_caps (const GstCaps * caps, gint * width, gint * height,
gint * depth, gint * bpp)
{
const GstStructure *structure;
GstStructure *structure;
gboolean ret;
if (gst_caps_get_size (caps) < 1)
@ -687,7 +715,16 @@ gst_niimaq_parse_caps (const GstCaps * caps, gint * width, gint * height,
return TRUE;
}
/* Set color on caps */
/**
* gst_niimaq_set_caps_color:
* gs: a #GstStructure to set the color of.
* bpp: the bits per pixel to set.
* depth: the depth to set.
*
* Sets the given bpp and depth to the given #GstStructure.
*
* Returns: TRUE on success
*/
static gboolean
gst_niimaq_set_caps_color (GstStructure * gs, gint bpp, gint depth)
{
@ -729,7 +766,7 @@ gst_niimaq_set_caps_framesize (GstStructure * gs, gint width, gint height)
/**
* gst_niimaq_get_cam_caps:
* src: #GstNiImaq
* src: #GstNiImaq instance
*
* Get caps of camera attached to open IMAQ interface
*
@ -752,7 +789,8 @@ gst_niimaq_get_cam_caps (GstNiImaq * src)
goto error;
}
rval &= imgGetAttribute(src->iid, IMG_ATTR_BITSPERPIXEL, &val);
/* retrieve caps from IMAQ interface */
rval = imgGetAttribute(src->iid, IMG_ATTR_BITSPERPIXEL, &val);
bpp = val;
rval &= imgGetAttribute(src->iid, IMG_ATTR_BYTESPERPIXEL, &val);
depth = val*8;
@ -771,6 +809,7 @@ gst_niimaq_get_cam_caps (GstNiImaq * src)
goto error;
}
/* create new structure and set caps we got from IMAQ */
gs = gst_structure_empty_new ("video");
if (!gst_niimaq_set_caps_color(gs, bpp, depth) ||
!gst_niimaq_set_caps_framesize(gs, width, height)) {
@ -807,6 +846,14 @@ error:
return NULL;
}
/**
* gst_niimaq_start:
* src: #GstBaseSrc instance
*
* Open necessary resources
*
* Returns: TRUE on success
*/
static gboolean
gst_niimaq_start (GstBaseSrc * src)
{
@ -816,13 +863,13 @@ gst_niimaq_start (GstBaseSrc * src)
gint i;
GstPad * pad;
GST_LOG_OBJECT (filter, "Opening IMAQ interface: %s", filter->interface_name);
filter->iid = 0;
filter->sid = 0;
rval=imgInterfaceOpen(filter->interface_name,&(filter->iid));
GST_LOG_OBJECT (filter, "Opening IMAQ interface: %s", filter->interface_name);
/* open IMAQ interface */
rval=imgInterfaceOpen(filter->interface_name,&(filter->iid));
if (rval) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to open IMAQ interface"),
("Failed to open camera interface %s", filter->interface_name));
@ -831,6 +878,7 @@ gst_niimaq_start (GstBaseSrc * src)
GST_LOG_OBJECT (filter, "Opening IMAQ session: %s", filter->interface_name);
/* open IMAQ session */
rval=imgSessionOpen(filter->iid, &(filter->sid));
if (rval) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to open IMAQ session"),
@ -838,11 +886,12 @@ gst_niimaq_start (GstBaseSrc * src)
goto error;
}
/* get caps from camera and set to src pad*/
if (filter->caps) {
gst_caps_unref (filter->caps);
filter->caps = NULL;
}
/* get caps from camera and set to src pad */
filter->caps = gst_niimaq_get_cam_caps (filter);
if (filter->caps == NULL) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to get caps from IMAQ"),
@ -860,12 +909,13 @@ gst_niimaq_start (GstBaseSrc * src)
GST_LOG_OBJECT (filter, "Creating ring with %d buffers", filter->bufsize);
filter->buflist = g_new(guint32*, filter->bufsize);
for(i=0;i<filter->bufsize;i++) {
/* create array of pointers to give to IMAQ for creating internal buffers */
filter->buflist = g_new (guint32*, filter->bufsize);
for (i=0; i < filter->bufsize; i++) {
filter->buflist[i] = 0;
}
rval=imgRingSetup(filter->sid, filter->bufsize, (void**)(filter->buflist), 0, FALSE);
if(rval) {
rval=imgRingSetup (filter->sid, filter->bufsize, (void**)(filter->buflist), 0, FALSE);
if (rval) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to create ring buffer"),
("Failed to create ring buffer with %d buffers", filter->bufsize));
goto error;
@ -874,18 +924,20 @@ gst_niimaq_start (GstBaseSrc * src)
/*GST_LOG_OBJECT (filter, "Registering callback functions");
rval=imgSessionWaitSignalAsync2(filter->sid, IMG_SIGNAL_STATUS, IMG_BUF_COMPLETE, IMG_SIGNAL_STATE_RISING, Imaq_BUF_COMPLETE, filter);
if(rval) {
// GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to register BUF_COMPLETE callback"),
// ("Failed to register BUF_COMPLETE callback"));
// goto error;
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to register BUF_COMPLETE callback"),
("Failed to register BUF_COMPLETE callback"));
goto error;
}*/
rval=imgSessionStartAcquisition(filter->sid);
/* 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=imgSessionStartAcquisition (filter->sid)) {
if (rval != 0) {
GST_LOG_OBJECT (src, "camera is still off , retrying");
}
@ -904,7 +956,7 @@ gst_niimaq_start (GstBaseSrc * src)
return TRUE;
error:
/* close IMAQ session and interface */
if(filter->sid)
imgClose(filter->sid,TRUE);
filter->sid = 0;
@ -916,12 +968,21 @@ error:
}
gboolean gst_niimaq_stop( GstBaseSrc * src )
/**
* gst_niimaq_stop:
* src: #GstBaseSrc instance
*
* Close resources opened by gst_niimaq_start
*
* Returns: TRUE on success
*/
static gboolean
gst_niimaq_stop (GstBaseSrc * src)
{
GstNiImaq* filter = GST_NIIMAQ(src);
Int32 rval;
/* stop IMAQ session */
rval=imgSessionStopAcquisition(filter->sid);
if (rval) {
GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Unable to stop acquisition"),
@ -930,6 +991,7 @@ gboolean gst_niimaq_stop( GstBaseSrc * src )
GST_DEBUG_OBJECT (filter, "Acquisition stopped");
/* close IMAQ session and interface */
if(filter->sid)
imgClose(filter->sid,TRUE);
filter->sid = 0;
@ -942,18 +1004,25 @@ gboolean gst_niimaq_stop( GstBaseSrc * src )
return TRUE;
}
/**
* plugin_init:
* plugin: #GstPlugin
*
* Initialize plugin by registering elements
*
* Returns: TRUE on success
*/
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (niimaq_debug, "niimaqsrc", 0, "NI-IMAQ interface");
/* we only have one element in this plugin */
return gst_element_register (plugin, "niimaqsrc", GST_RANK_NONE,
GST_TYPE_NIIMAQ);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"niimaq",
"NI-IMAQ Video Source",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "niimaq",
"NI-IMAQ Video Source", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)