diff options
Diffstat (limited to 'sys/v4l2')
| -rw-r--r-- | sys/v4l2/gstv4l2element.c | 176 | ||||
| -rw-r--r-- | sys/v4l2/gstv4l2element.h | 5 |
2 files changed, 180 insertions, 1 deletions
diff --git a/sys/v4l2/gstv4l2element.c b/sys/v4l2/gstv4l2element.c index 45ae11c8..c9a8118c 100644 --- a/sys/v4l2/gstv4l2element.c +++ b/sys/v4l2/gstv4l2element.c @@ -21,11 +21,18 @@ #include <config.h> #endif +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#include <unistd.h> + #include "v4l2_calls.h" #include "gstv4l2tuner.h" #include "gstv4l2xoverlay.h" #include "gstv4l2colorbalance.h" +#include <gst/propertyprobe/propertyprobe.h> + /* elementfactory details */ static GstElementDetails gst_v4l2element_details = { "Generic video4linux2 Element", @@ -99,6 +106,163 @@ gst_v4l2_interface_init (GstInterfaceClass *klass) } +static const GList * +gst_v4l2_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, "device")); + } + + return list; +} + +static gboolean +gst_v4l2_class_probe_devices (GstV4l2ElementClass *klass, + gboolean check) +{ + static gboolean init = FALSE; + + if (!init && !check) { + gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL }; + gint base, n, fd; + + while (klass->devices) { + GList *item = klass->devices; + gchar *device = item->data; + + klass->devices = g_list_remove (klass->devices, item); + g_free (device); + } + + /* detect /dev entries */ + for (n = 0; n < 64; n++) { + for (base = 0; dev_base[base] != NULL; base++) { + struct stat s; + gchar *device = g_strdup_printf ("%s%d", + dev_base[base], n); + + /* does the /dev/ entry exist at all? */ + if (stat (device, &s) == 0) { + /* yes: is a device attached? */ + if ((fd = open (device, O_RDONLY)) > 0 || + errno == EBUSY) { + if (fd > 0) + close (fd); + + klass->devices = + g_list_append (klass->devices, + device); + break; + } + } + g_free (device); + } + } + + init = TRUE; + } + + return init; +} + +static void +gst_v4l2_probe_probe_property (GstPropertyProbe *probe, + guint prop_id, + const GParamSpec *pspec) +{ + GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe); + + switch (prop_id) { + case ARG_DEVICE: + gst_v4l2_class_probe_devices (klass, FALSE); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); + break; + } +} + +static gboolean +gst_v4l2_probe_needs_probe (GstPropertyProbe *probe, + guint prop_id, + const GParamSpec *pspec) +{ + GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe); + gboolean ret = FALSE; + + switch (prop_id) { + case ARG_DEVICE: + ret = !gst_v4l2_class_probe_devices (klass, TRUE); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); + break; + } + + return ret; +} + +static GValueArray * +gst_v4l2_class_list_devices (GstV4l2ElementClass *klass) +{ + GValueArray *array; + GValue value = { 0 }; + GList *item; + + if (!klass->devices) + return NULL; + + array = g_value_array_new (g_list_length (klass->devices)); + item = klass->devices; + g_value_init (&value, G_TYPE_STRING); + while (item) { + gchar *device = item->data; + + g_value_set_string (&value, device); + g_value_array_append (array, &value); + + item = item->next; + } + g_value_unset (&value); + + return array; +} + +static GValueArray * +gst_v4l2_probe_get_values (GstPropertyProbe *probe, + guint prop_id, + const GParamSpec *pspec) +{ + GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe); + GValueArray *array = NULL; + + switch (prop_id) { + case ARG_DEVICE: + array = gst_v4l2_class_list_devices (klass); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec); + break; + } + + return array; +} + + +static void +gst_v4l2_property_probe_interface_init (GstPropertyProbeInterface *iface) +{ + iface->get_properties = gst_v4l2_probe_get_properties; + iface->probe_property = gst_v4l2_probe_probe_property; + iface->needs_probe = gst_v4l2_probe_needs_probe; + iface->get_values = gst_v4l2_probe_get_values; +} + + GType gst_v4l2element_get_type (void) { @@ -137,6 +301,11 @@ gst_v4l2element_get_type (void) NULL, NULL, }; + static const GInterfaceInfo v4l2_propertyprobe_info = { + (GInterfaceInitFunc) gst_v4l2_property_probe_interface_init, + NULL, + NULL, + }; v4l2element_type = g_type_register_static(GST_TYPE_ELEMENT, @@ -154,6 +323,9 @@ gst_v4l2element_get_type (void) g_type_add_interface_static (v4l2element_type, GST_TYPE_COLOR_BALANCE, &v4l2_colorbalance_info); + g_type_add_interface_static (v4l2element_type, + GST_TYPE_PROPERTY_PROBE, + &v4l2_propertyprobe_info); } return v4l2element_type; @@ -193,7 +365,9 @@ static void gst_v4l2element_base_init (GstV4l2ElementClass *klass) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); - + + klass->devices = NULL; + gst_element_class_set_details (gstelement_class, &gst_v4l2element_details); } diff --git a/sys/v4l2/gstv4l2element.h b/sys/v4l2/gstv4l2element.h index 23d379e2..a57f66f0 100644 --- a/sys/v4l2/gstv4l2element.h +++ b/sys/v4l2/gstv4l2element.h @@ -51,6 +51,8 @@ (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_V4L2ELEMENT)) #define GST_IS_V4L2ELEMENT_CLASS(obj) \ (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_V4L2ELEMENT)) +#define GST_V4L2ELEMENT_GET_CLASS(obj) \ + (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_V4L2ELEMENT, GstV4l2ElementClass)) typedef struct _GstV4l2Element GstV4l2Element; @@ -87,6 +89,9 @@ struct _GstV4l2Element { struct _GstV4l2ElementClass { GstElementClass parent_class; + /* probed devices */ + GList *devices; + /* signals */ void (*open) (GstElement *element, const gchar *device); |