/* GStreamer * Copyright (C) <2006> Eric Jonas * Copyright (C) <2006> Antoine Tremblay * Copyright (C) 2010 United States Government, Joshua M. Doe * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-niimaqsrc * * Source for National Instruments IMAQ frame grabber (Camera Link and analog cameras) * * * Example launch line * |[ * gst-launch -v niimaqsrc ! ffmpegcolorspace ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gst/interfaces/propertyprobe.h" #include "gstniimaq.h" #include #include GST_DEBUG_CATEGORY (niimaq_debug); #define GST_CAT_DEFAULT niimaq_debug static GstElementDetails niimaq_details = GST_ELEMENT_DETAILS ("NI-IMAQ Video Source", "Source/Video", "National Instruments based source, supports Camera Link and analog cameras", "Joshua Doe "); enum { PROP_0, PROP_INTERFACE, PROP_TIMESTAMP_OFFSET, PROP_BUFSIZE /* FILL ME */ }; #define DEFAULT_PROP_INTERFACE "img0" #define DEFAULT_PROP_TIMESTAMP_OFFSET 0 #define DEFAULT_PROP_BUFSIZE 10 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ( "video/x-raw-gray, " "bpp = (int) 8, " "depth = (int) 8, " "width = (int) [ 1, max ], " "height = (int) [ 1, max ], " "framerate = (fraction) [ 0, max ]" ";" "video/x-raw-gray, " "bpp = (int) {10, 12, 14, 16}, " "depth = (int) 16, " "endianness = (int) LITTLE_ENDIAN, " "width = (int) [ 1, max ], " "height = (int) [ 1, max ], " "framerate = (fraction) [ 0, max ]" ) ); static void gst_niimaq_init_interfaces (GType type); GST_BOILERPLATE_FULL (GstNiImaq, gst_niimaq, GstPushSrc, GST_TYPE_PUSH_SRC, gst_niimaq_init_interfaces); /* GObject virtual methods */ static void gst_niimaq_dispose (GObject * object); static void gst_niimaq_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_niimaq_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); /* GstBaseSrc virtual methods */ static GstCaps *gst_niimaq_get_caps (GstBaseSrc * bsrc); static gboolean gst_niimaq_set_caps (GstBaseSrc * bsrc, GstCaps * caps); static void gst_niimaq_get_times (GstBaseSrc * basesrc, GstBuffer * buffer, GstClockTime * start, GstClockTime * end); static gboolean gst_niimaq_start (GstBaseSrc * src); static gboolean gst_niimaq_stop (GstBaseSrc * src); /* GstPushSrc virtual methods */ static GstFlowReturn gst_niimaq_create (GstPushSrc * psrc, GstBuffer ** buffer); /* GstNiImaq methods */ static gboolean gst_niimaq_parse_caps (const GstCaps * caps, gint * width, gint * height, gint * depth, gint * bpp); static gboolean gst_niimaq_set_caps_color (GstStructure * gs, gint bpp, gint depth); static gboolean gst_niimaq_set_caps_framesize (GstStructure * gs, gint width, gint height); static GstCaps *gst_niimaq_get_cam_caps (GstNiImaq * src); static void _____BEGIN_FUNCTIONS_____(); /** * gst_niimaq_probe_get_properties: * @probe: #GstPropertyProbe * * Gets list of properties that can be probed * * Returns: #GList of properties that can be probed */ static const GList * gst_niimaq_probe_get_properties (GstPropertyProbe * probe) { GObjectClass *klass = G_OBJECT_GET_CLASS (probe); static GList *list = NULL; if (!list) { list = g_list_append (NULL, g_object_class_find_property (klass, "interface")); } return list; } static gboolean init = FALSE; static GList *interfaces = NULL; /** * gst_niimaq_class_probe_interfaces: * @klass: #GstNiImaqClass * @check: whether to enumerate interfaces * * Probes NI-IMAQ driver for available interfaces * * Returns: TRUE always */ static gboolean gst_niimaq_class_probe_interfaces (GstNiImaqClass * klass, gboolean check) { if (!check) { guint32 n; gchar name[256]; /* clear interface list */ while (interfaces) { gchar *iface = interfaces->data; interfaces = g_list_remove (interfaces, iface); g_free (iface); } GST_DEBUG_OBJECT (klass, "About to probe for IMAQ interfaces"); /* enumerate interfaces, limiting ourselves to the first 64 */ for (n = 0; n < 64; n++) { guint32 iid; guint32 nports; guint32 port; gchar * iname; /* get interface names until there are no more */ if (imgInterfaceQueryNames (n, name) != 0) break; /* ignore NICFGen */ if (g_strcmp0 (name, "NICFGen.iid") == 0) continue; /* try and open the interface */ if (imgInterfaceOpen (name, &iid) != 0) continue; /* find how many ports the interface provides */ imgGetAttribute (iid, IMG_ATTR_NUM_PORTS, &nports); imgClose (iid, TRUE); /* iterate over all the available ports */ for (port=0; port < nports; port++) { /* if the there are multiple ports append the port number */ if (nports > 1) iname = g_strdup_printf ("%s::%d", name, port); else iname = g_strdup (name); /* TODO: should check to see if a camera is actually attached */ interfaces = g_list_append (interfaces, iname); GST_DEBUG_OBJECT (klass, "Adding interface '%s' to list", iname); } } init = TRUE; } klass->interfaces = interfaces; return init; } /** * gst_niimaq_probe_probe_property: * @probe: #GstPropertyProbe * @prop_id: Property id * @pspec: #GParamSpec * * GstPropertyProbe _probe_proprty vmethod implementation that probes a * property for possible values */ static void gst_niimaq_probe_probe_property (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec) { GstNiImaqClass *klass = GST_NIIMAQ_GET_CLASS (probe); switch (prop_id) { case PROP_INTERFACE: gst_niimaq_class_probe_interfaces (klass, FALSE); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } } /** * gst_niimaq_probe_needs_probe: * @probe: #GstPropertyProbe * @prop_id: Property id * @pspec: #GParamSpec * * GstPropertyProbe _needs_probe vmethod implementation that indicates if * a property needs to be updated * * Returns: TRUE if a property needs to be updated */ static gboolean gst_niimaq_probe_needs_probe (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec) { GstNiImaqClass *klass = GST_NIIMAQ_GET_CLASS (probe); gboolean ret = FALSE; switch (prop_id) { case PROP_INTERFACE: ret = !gst_niimaq_class_probe_interfaces (klass, TRUE); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } return ret; } /** * gst_niimaq_class_list_interfaces: * @klass: #GstNiImaqClass * * Returns: #GValueArray of interface names */ static GValueArray * gst_niimaq_class_list_interfaces (GstNiImaqClass * klass) { GValueArray *array; GValue value = { 0 }; GList *item; if (!klass->interfaces) return NULL; array = g_value_array_new (g_list_length (klass->interfaces)); item = klass->interfaces; g_value_init (&value, G_TYPE_STRING); while (item) { gchar *iface = item->data; g_value_set_string (&value, iface); g_value_array_append (array, &value); item = item->next; } g_value_unset (&value); return array; } /** * gst_niimaq_probe_get_values: * @probe: #GstPropertyProbe * @prop_id: Property id * @pspec: #GParamSpec * * GstPropertyProbe _get_values vmethod implementation that gets possible * values for a property * * Returns: #GValueArray containing possible values for requested property */ static GValueArray * gst_niimaq_probe_get_values (GstPropertyProbe * probe, guint prop_id, const GParamSpec * pspec) { GstNiImaqClass *klass = GST_NIIMAQ_GET_CLASS (probe); GValueArray *array = NULL; switch (prop_id) { case PROP_INTERFACE: array = gst_niimaq_class_list_interfaces (klass); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); break; } return array; } /** * gst_v4l_property_probe_interface_init: * @iface: #GstPropertyProbeInterface * * Install property probe interfaces functions */ static void gst_niimaq_property_probe_interface_init (GstPropertyProbeInterface * iface) { iface->get_properties = gst_niimaq_probe_get_properties; iface->probe_property = gst_niimaq_probe_probe_property; iface->needs_probe = gst_niimaq_probe_needs_probe; iface->get_values = gst_niimaq_probe_get_values; } /** * gst_niimaq_init_interfaces: * @type: #GType * * Initialize all GStreamer interfaces */ static void gst_niimaq_init_interfaces (GType type) { static const GInterfaceInfo niimaq_propertyprobe_info = { (GInterfaceInitFunc) gst_niimaq_property_probe_interface_init, NULL, NULL, }; g_type_add_interface_static (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) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details (element_class, &niimaq_details); gst_element_class_add_pad_template (element_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) { /* 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", "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; 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; src->n_frames = 0; src->cumbufnum = 0; src->n_dropped_frames = 0; src->buflist = 0; src->sid = 0; src->iid = 0; src->camera_name = g_strdup (DEFAULT_PROP_INTERFACE); src->interface_name = g_strdup (DEFAULT_PROP_INTERFACE); } /** * 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); } static void gst_niimaq_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstNiImaq *src = GST_NIIMAQ (object); switch (prop_id) { case PROP_INTERFACE: if (src->interface_name) g_free (src->interface_name); src->interface_name = g_strdup (g_value_get_string (value)); if (src->camera_name) g_free (src->camera_name); src->camera_name = g_strdup (g_value_get_string (value)); break; case PROP_TIMESTAMP_OFFSET: src->timestamp_offset = g_value_get_int64 (value); break; case PROP_BUFSIZE: src->bufsize = g_value_get_int (value); default: break; } } static void gst_niimaq_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstNiImaq *src = GST_NIIMAQ (object); switch (prop_id) { case PROP_INTERFACE: g_value_set_string (value, src->interface_name); break; case PROP_TIMESTAMP_OFFSET: g_value_set_int64 (value, src->timestamp_offset); break; case PROP_BUFSIZE: g_value_set_int (value, src->bufsize); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstCaps * gst_niimaq_get_caps (GstBaseSrc * bsrc) { GstNiImaq *gsrc = GST_NIIMAQ (bsrc); GST_DEBUG_OBJECT (bsrc, "Entering function get_caps"); g_return_val_if_fail (gsrc->caps, NULL); return gst_caps_copy (gsrc->caps); } static gboolean gst_niimaq_set_caps (GstBaseSrc * bsrc, GstCaps * caps) { gboolean res = TRUE; GstNiImaq *niimaq; gint width, height; gint bpp, depth; niimaq = GST_NIIMAQ (bsrc); GST_DEBUG_OBJECT (bsrc, "Entering function set_caps"); GST_DEBUG_OBJECT (caps, "are the caps being set"); if (niimaq->caps) { gst_caps_unref (niimaq->caps); niimaq->caps = gst_caps_copy (caps); } res = gst_niimaq_parse_caps (niimaq->caps, &width, &height, &depth, &bpp); if (res) { /* looks ok here */ niimaq->width = width; niimaq->height = height; niimaq->depth = depth; niimaq->bpp = bpp; niimaq->framesize = width * height * (depth/8); } return res; } static void gst_niimaq_get_times (GstBaseSrc * basesrc, GstBuffer * buffer, GstClockTime * start, GstClockTime * end) { /* for live sources, sync on the timestamp of the buffer */ if (gst_base_src_is_live (basesrc)) { GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer); if (GST_CLOCK_TIME_IS_VALID (timestamp)) { /* get duration to calculate end time */ GstClockTime duration = GST_BUFFER_DURATION (buffer); if (GST_CLOCK_TIME_IS_VALID (duration)) { *end = timestamp + duration; } *start = timestamp; } } else { *start = -1; *end = -1; } } static GstFlowReturn gst_niimaq_create (GstPushSrc * psrc, GstBuffer ** buffer) { GstNiImaq *src; gpointer data; GstCaps *caps; GstFlowReturn res = GST_FLOW_OK; uInt32 copied_number; uInt32 copied_index; Int32 rval; uInt32 dropped; src = GST_NIIMAQ (psrc); data = g_malloc(src->framesize); GST_DEBUG_OBJECT(src, "Copying IMAQ buffer %d", src->cumbufnum); rval = imgSessionCopyBufferByNumber (src->sid, src->cumbufnum, data, IMG_OVERWRITE_GET_OLDEST, &copied_number, &copied_index); if (rval) { GST_ELEMENT_ERROR (src, RESOURCE, FAILED, ("failed to copy buffer %d", src->cumbufnum), ("failed to copy buffer %d", src->cumbufnum)); goto error; } *buffer = gst_buffer_new (); GST_BUFFER_DATA (*buffer) = data; GST_BUFFER_MALLOCDATA (*buffer) = data; GST_BUFFER_SIZE (*buffer) = src->framesize; /* set caps of src pad to buffer */ caps = gst_pad_get_caps (GST_BASE_SRC_PAD (psrc)); 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); }*/ dropped = copied_number - src->cumbufnum; if (dropped > 0) { src->n_dropped_frames += dropped; GST_WARNING_OBJECT (src, "Asked to copy buffer %d but was given %d", src->cumbufnum, copied_number); GST_WARNING_OBJECT (src, "Dropped %d frames (%d total)", dropped, src->n_dropped_frames); } /* set cumulative buffer number to get next frame */ src->cumbufnum = copied_number + 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); }*/ return res; error: { return GST_FLOW_ERROR; } } /** * gst_niimaq_parse_caps: * caps: a #GstCaps to parse * width: * height: * depth: * bpp: * * Parses a given caps and sets critical values. * * Returns: TRUE on success */ static gboolean gst_niimaq_parse_caps (const GstCaps * caps, gint * width, gint * height, gint * depth, gint * bpp) { GstStructure *structure; gboolean ret; if (gst_caps_get_size (caps) < 1) return FALSE; structure = gst_caps_get_structure (caps, 0); ret = gst_structure_get (structure, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, "depth", G_TYPE_INT, depth, "bpp", G_TYPE_INT, bpp, NULL); if (!ret) { GST_DEBUG ("Failed to retrieve width, height, depth, or bpp"); return FALSE; } return TRUE; } /** * 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) { gboolean ret = TRUE; gst_structure_set_name (gs, "video/x-raw-gray"); gst_structure_set (gs, "bpp", G_TYPE_INT, bpp, "depth", G_TYPE_INT, depth, NULL); if (depth > 8) { gst_structure_set(gs, "endianness", G_TYPE_INT, G_LITTLE_ENDIAN, NULL); } return ret; } /** * gst_niimaq_set_caps_framesize: * gs: #GstStructure * width: width to set * height: height to set * * Sets the given width and height to the given #GstStructure * * Returns: TRUE on success */ static gboolean gst_niimaq_set_caps_framesize (GstStructure * gs, gint width, gint height) { gst_structure_set (gs, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL); return TRUE; } /** * gst_niimaq_get_cam_caps: * src: #GstNiImaq instance * * Get caps of camera attached to open IMAQ interface * * Returns: the #GstCaps of the src pad. Unref the caps when you no longer need it. */ GstCaps * gst_niimaq_get_cam_caps (GstNiImaq * src) { GstCaps *gcaps = NULL; Int32 rval; uInt32 val; gint width, height, depth, bpp; GstStructure *gs; gcaps = gst_caps_new_empty (); if (!src->iid) { GST_ELEMENT_ERROR (src, RESOURCE, FAILED, ("Camera interface not open"), ("Camera interface not open")); goto error; } /* 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; rval &= imgGetAttribute(src->iid, IMG_ATTR_ROI_WIDTH, &val); width = val; rval &= imgGetAttribute(src->iid, IMG_ATTR_ROI_HEIGHT, &val); height = val; /* TODO: support both actual bpp and bpp=16 */ bpp = depth; if (rval) { GST_ELEMENT_ERROR (src, STREAM, FAILED, ("attempt to read attributes failed"), ("attempt to read attributes failed")); 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)) { GST_ELEMENT_ERROR (src, STREAM, FAILED, ("attempt to set caps %dx%dx%d (%d) failed", width,height,depth, bpp), ("attempt to set caps %dx%dx%d (%d) failed", width,height,depth, bpp)); goto error; } /* hard code framerate to 30Hz as IMAQ doesn't tell us anything about it */ gst_structure_set(gs, "framerate", GST_TYPE_FRACTION, 30, 1, NULL); gst_caps_append_structure (gcaps, gst_structure_copy (gs)); /* if (8 < bpp < 16), then append structure with bpp=16 so ffmpegcolorspace * and other elements can work directly with this src */ /* TODO: support both actual bpp (10,12,14) and 16 */ /*if (bpp > 8) { gst_niimaq_set_caps_color (gs, 16, 16); gst_caps_append_structure (gcaps, gst_structure_copy (gs)); }*/ gst_object_unref (gs); GST_DEBUG_OBJECT (gcaps, "are the camera caps"); return gcaps; error: if (gcaps) { gst_caps_unref (gcaps); } return NULL; } /** * gst_niimaq_start: * src: #GstBaseSrc instance * * Open necessary resources * * Returns: TRUE on success */ static gboolean gst_niimaq_start (GstBaseSrc * src) { GstNiImaq* filter = GST_NIIMAQ(src); Int32 rval; gboolean ret; gint i; GstPad * pad; filter->iid = 0; filter->sid = 0; 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)); goto error; } 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"), ("Failed to open camera session %d", filter->sid)); goto error; } 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"), ("Failed to get caps from IMAQ")); goto error; } pad = gst_element_get_static_pad (GST_ELEMENT (src), "src"); ret = gst_pad_set_caps (pad, gst_caps_copy (filter->caps)); gst_object_unref (pad); if (!ret) { GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed set caps to src pad"), ("Failed set caps to src pad")); goto error; } GST_LOG_OBJECT (filter, "Creating ring with %d buffers", filter->bufsize); /* 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) { GST_ELEMENT_ERROR (filter, RESOURCE, FAILED, ("Failed to create ring buffer"), ("Failed to create ring buffer with %d buffers", filter->bufsize)); goto error; } /*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; }*/ /* 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: /* close IMAQ session and interface */ if(filter->sid) imgClose(filter->sid,TRUE); filter->sid = 0; if(filter->iid) imgClose(filter->iid,TRUE); filter->iid = 0; return FALSE;; } /** * 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"), ("Unable to stop acquisition")); } GST_DEBUG_OBJECT (filter, "Acquisition stopped"); /* close IMAQ session and interface */ if(filter->sid) imgClose(filter->sid,TRUE); filter->sid = 0; if(filter->iid) imgClose(filter->iid,TRUE); filter->iid = 0; GST_DEBUG_OBJECT (filter, "IMAQ interface closed"); 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)