1 /* G-Streamer generic V4L2 element
2 * Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
29 #include "v4l2_calls.h"
30 #include "gstv4l2tuner.h"
32 #include "gstv4l2xoverlay.h"
34 #include "gstv4l2colorbalance.h"
36 #include <gst/propertyprobe/propertyprobe.h>
38 /* elementfactory details */
39 static GstElementDetails gst_v4l2element_details = {
40 "Generic video4linux2 Element",
42 "Generic plugin for handling common video4linux2 calls",
43 "Ronald Bultje <rbultje@ronald.bitfreak.net>"
46 /* V4l2Element signals and args */
67 static void gst_v4l2element_class_init (GstV4l2ElementClass * klass);
68 static void gst_v4l2element_base_init (GstV4l2ElementClass * klass);
69 static void gst_v4l2element_init (GstV4l2Element * v4lelement);
70 static void gst_v4l2element_dispose (GObject * object);
71 static void gst_v4l2element_set_property (GObject * object,
72 guint prop_id, const GValue * value, GParamSpec * pspec);
73 static void gst_v4l2element_get_property (GObject * object,
74 guint prop_id, GValue * value, GParamSpec * pspec);
75 static GstElementStateReturn
76 gst_v4l2element_change_state (GstElement * element);
79 static GstElementClass *parent_class = NULL;
80 static guint gst_v4l2element_signals[LAST_SIGNAL] = { 0 };
84 gst_v4l2_iface_supported (GstImplementsInterface * iface, GType iface_type)
86 GstV4l2Element *v4l2element = GST_V4L2ELEMENT (iface);
89 g_assert (iface_type == GST_TYPE_TUNER ||
90 iface_type == GST_TYPE_X_OVERLAY || iface_type == GST_TYPE_COLOR_BALANCE);
92 g_assert (iface_type == GST_TYPE_TUNER ||
93 iface_type == GST_TYPE_COLOR_BALANCE);
96 if (v4l2element->video_fd == -1)
100 if (iface_type == GST_TYPE_X_OVERLAY && !GST_V4L2_IS_OVERLAY (v4l2element))
109 gst_v4l2_interface_init (GstImplementsInterfaceClass * klass)
111 /* default virtual functions */
112 klass->supported = gst_v4l2_iface_supported;
117 gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
119 GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
120 static GList *list = NULL;
123 list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
130 gst_v4l2_class_probe_devices (GstV4l2ElementClass * klass, gboolean check)
132 static gboolean init = FALSE;
133 static GList *devices = NULL;
135 if (!init && !check) {
136 gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };
140 GList *item = devices;
141 gchar *device = item->data;
143 devices = g_list_remove (devices, item);
147 /* detect /dev entries */
148 for (n = 0; n < 64; n++) {
149 for (base = 0; dev_base[base] != NULL; base++) {
151 gchar *device = g_strdup_printf ("%s%d",
154 /* does the /dev/ entry exist at all? */
155 if (stat (device, &s) == 0) {
156 /* yes: is a device attached? */
157 if ((fd = open (device, O_RDONLY)) > 0 || errno == EBUSY) {
161 devices = g_list_append (devices, device);
172 klass->devices = devices;
178 gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
179 guint prop_id, const GParamSpec * pspec)
181 GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
185 gst_v4l2_class_probe_devices (klass, FALSE);
188 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
194 gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
195 guint prop_id, const GParamSpec * pspec)
197 GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
198 gboolean ret = FALSE;
202 ret = !gst_v4l2_class_probe_devices (klass, TRUE);
205 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
213 gst_v4l2_class_list_devices (GstV4l2ElementClass * klass)
216 GValue value = { 0 };
222 array = g_value_array_new (g_list_length (klass->devices));
223 item = klass->devices;
224 g_value_init (&value, G_TYPE_STRING);
226 gchar *device = item->data;
228 g_value_set_string (&value, device);
229 g_value_array_append (array, &value);
233 g_value_unset (&value);
239 gst_v4l2_probe_get_values (GstPropertyProbe * probe,
240 guint prop_id, const GParamSpec * pspec)
242 GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
243 GValueArray *array = NULL;
247 array = gst_v4l2_class_list_devices (klass);
250 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
259 gst_v4l2_property_probe_interface_init (GstPropertyProbeInterface * iface)
261 iface->get_properties = gst_v4l2_probe_get_properties;
262 iface->probe_property = gst_v4l2_probe_probe_property;
263 iface->needs_probe = gst_v4l2_probe_needs_probe;
264 iface->get_values = gst_v4l2_probe_get_values;
269 gst_v4l2element_get_type (void)
271 static GType v4l2element_type = 0;
273 if (!v4l2element_type) {
274 static const GTypeInfo v4l2element_info = {
275 sizeof (GstV4l2ElementClass),
276 (GBaseInitFunc) gst_v4l2element_base_init,
278 (GClassInitFunc) gst_v4l2element_class_init,
281 sizeof (GstV4l2Element),
283 (GInstanceInitFunc) gst_v4l2element_init,
286 static const GInterfaceInfo v4l2iface_info = {
287 (GInterfaceInitFunc) gst_v4l2_interface_init,
291 static const GInterfaceInfo v4l2_tuner_info = {
292 (GInterfaceInitFunc) gst_v4l2_tuner_interface_init,
297 static const GInterfaceInfo v4l2_xoverlay_info = {
298 (GInterfaceInitFunc) gst_v4l2_xoverlay_interface_init,
303 static const GInterfaceInfo v4l2_colorbalance_info = {
304 (GInterfaceInitFunc) gst_v4l2_color_balance_interface_init,
308 static const GInterfaceInfo v4l2_propertyprobe_info = {
309 (GInterfaceInitFunc) gst_v4l2_property_probe_interface_init,
315 g_type_register_static (GST_TYPE_ELEMENT,
316 "GstV4l2Element", &v4l2element_info, 0);
318 g_type_add_interface_static (v4l2element_type,
319 GST_TYPE_IMPLEMENTS_INTERFACE, &v4l2iface_info);
320 g_type_add_interface_static (v4l2element_type,
321 GST_TYPE_TUNER, &v4l2_tuner_info);
323 g_type_add_interface_static (v4l2element_type,
324 GST_TYPE_X_OVERLAY, &v4l2_xoverlay_info);
326 g_type_add_interface_static (v4l2element_type,
327 GST_TYPE_COLOR_BALANCE, &v4l2_colorbalance_info);
328 g_type_add_interface_static (v4l2element_type,
329 GST_TYPE_PROPERTY_PROBE, &v4l2_propertyprobe_info);
332 return v4l2element_type;
336 #define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
338 gst_v4l2_device_get_type (void)
340 static GType v4l2_device_type = 0;
342 if (v4l2_device_type == 0) {
343 static const GFlagsValue values[] = {
344 {V4L2_CAP_VIDEO_CAPTURE, "CAPTURE",
345 "Device can capture"},
346 {V4L2_CAP_VIDEO_OUTPUT, "PLAYBACK",
347 "Device can playback"},
348 {V4L2_CAP_VIDEO_OVERLAY, "OVERLAY",
349 "Device can do overlay"},
350 {V4L2_CAP_TUNER, "TUNER",
351 "Device has a tuner"},
352 {V4L2_CAP_AUDIO, "AUDIO",
353 "Device handles audio"},
358 g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
361 return v4l2_device_type;
365 gst_v4l2element_base_init (GstV4l2ElementClass * klass)
367 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
369 klass->devices = NULL;
371 gst_element_class_set_details (gstelement_class, &gst_v4l2element_details);
375 gst_v4l2element_class_init (GstV4l2ElementClass * klass)
377 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
378 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
380 parent_class = g_type_class_peek_parent (klass);
382 g_object_class_install_property (gobject_class, ARG_DEVICE,
383 g_param_spec_string ("device", "Device", "Device location",
384 NULL, G_PARAM_READWRITE));
385 g_object_class_install_property (gobject_class, ARG_DEVICE_NAME,
386 g_param_spec_string ("device_name", "Device name",
387 "Name of the device", NULL, G_PARAM_READABLE));
388 g_object_class_install_property (gobject_class, ARG_FLAGS,
389 g_param_spec_flags ("flags", "Flags", "Device type flags",
390 GST_TYPE_V4L2_DEVICE_FLAGS, 0, G_PARAM_READABLE));
391 g_object_class_install_property (gobject_class, ARG_NORM,
392 g_param_spec_string ("norm", "norm",
393 "Norm to use", NULL, G_PARAM_READWRITE));
394 g_object_class_install_property (gobject_class, ARG_CHANNEL,
395 g_param_spec_string ("channel", "channel",
396 "input/output to switch to", NULL, G_PARAM_READWRITE));
397 g_object_class_install_property (gobject_class, ARG_FREQUENCY,
398 g_param_spec_ulong ("frequency", "frequency",
399 "frequency to tune to (in Hz)", 0, G_MAXULONG, 0, G_PARAM_READWRITE));
402 gst_v4l2element_signals[SIGNAL_OPEN] =
403 g_signal_new ("open", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
404 G_STRUCT_OFFSET (GstV4l2ElementClass, open),
405 NULL, NULL, g_cclosure_marshal_VOID__STRING,
406 G_TYPE_NONE, 1, G_TYPE_STRING);
407 gst_v4l2element_signals[SIGNAL_CLOSE] =
408 g_signal_new ("close", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
409 G_STRUCT_OFFSET (GstV4l2ElementClass, close),
410 NULL, NULL, g_cclosure_marshal_VOID__STRING,
411 G_TYPE_NONE, 1, G_TYPE_STRING);
413 gobject_class->set_property = gst_v4l2element_set_property;
414 gobject_class->get_property = gst_v4l2element_get_property;
415 gobject_class->dispose = gst_v4l2element_dispose;
417 gstelement_class->change_state = gst_v4l2element_change_state;
422 gst_v4l2element_init (GstV4l2Element * v4l2element)
424 /* some default values */
425 v4l2element->video_fd = -1;
426 v4l2element->buffer = NULL;
427 v4l2element->device = g_strdup ("/dev/video0");
429 v4l2element->channels = NULL;
430 v4l2element->norms = NULL;
431 v4l2element->colors = NULL;
436 gst_v4l2element_dispose (GObject * object)
438 GstV4l2Element *v4l2element = GST_V4L2ELEMENT (object);
440 g_free (v4l2element->device);
441 v4l2element->device = NULL;
442 g_free (v4l2element->norm);
443 v4l2element->norm = NULL;
444 g_free (v4l2element->channel);
445 v4l2element->channel = NULL;
447 if (((GObjectClass *) parent_class)->dispose)
448 ((GObjectClass *) parent_class)->dispose (object);
452 gst_v4l2element_set_property (GObject * object,
453 guint prop_id, const GValue * value, GParamSpec * pspec)
455 GstV4l2Element *v4l2element;
457 g_return_if_fail (GST_IS_V4L2ELEMENT (object));
458 v4l2element = GST_V4L2ELEMENT (object);
462 if (!GST_V4L2_IS_OPEN (v4l2element)) {
463 if (v4l2element->device)
464 g_free (v4l2element->device);
465 v4l2element->device = g_value_dup_string (value);
469 if (GST_V4L2_IS_OPEN (v4l2element)) {
470 GstTuner *tuner = GST_TUNER (v4l2element);
471 GstTunerNorm *norm = gst_tuner_find_norm_by_name (tuner,
472 (gchar *) g_value_get_string (value));
475 gst_tuner_set_norm (tuner, norm);
478 g_free (v4l2element->norm);
479 v4l2element->norm = g_value_dup_string (value);
480 g_object_notify (object, "norm");
484 if (GST_V4L2_IS_OPEN (v4l2element)) {
485 GstTuner *tuner = GST_TUNER (v4l2element);
486 GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
487 (gchar *) g_value_get_string (value));
490 gst_tuner_set_channel (tuner, channel);
493 g_free (v4l2element->channel);
494 v4l2element->channel = g_value_dup_string (value);
495 g_object_notify (object, "channel");
499 if (GST_V4L2_IS_OPEN (v4l2element)) {
500 GstTuner *tuner = GST_TUNER (v4l2element);
501 GstTunerChannel *channel = gst_tuner_get_channel (tuner);
504 GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
505 gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value));
508 v4l2element->frequency = g_value_get_ulong (value);
509 g_object_notify (object, "frequency");
513 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
520 gst_v4l2element_get_property (GObject * object,
521 guint prop_id, GValue * value, GParamSpec * pspec)
523 GstV4l2Element *v4l2element;
525 g_return_if_fail (GST_IS_V4L2ELEMENT (object));
526 v4l2element = GST_V4L2ELEMENT (object);
530 g_value_set_string (value, v4l2element->device);
532 case ARG_DEVICE_NAME:{
535 if (GST_V4L2_IS_OPEN (v4l2element))
536 new = v4l2element->vcap.card;
537 g_value_set_string (value, new);
543 if (GST_V4L2_IS_OPEN (v4l2element)) {
544 flags |= v4l2element->vcap.capabilities & 0x30007;
546 g_value_set_flags (value, flags);
550 g_value_set_string (value, v4l2element->norm);
553 g_value_set_string (value, v4l2element->channel);
556 g_value_set_ulong (value, v4l2element->frequency);
559 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
565 static GstElementStateReturn
566 gst_v4l2element_change_state (GstElement * element)
568 GstV4l2Element *v4l2element;
570 g_return_val_if_fail (GST_IS_V4L2ELEMENT (element), GST_STATE_FAILURE);
572 v4l2element = GST_V4L2ELEMENT (element);
574 /* if going down into NULL state, close the device if it's open
575 * if going to READY, open the device (and set some options)
577 switch (GST_STATE_TRANSITION (element)) {
578 case GST_STATE_NULL_TO_READY:
579 if (!gst_v4l2_open (v4l2element))
580 return GST_STATE_FAILURE;
583 gst_v4l2_xoverlay_open (v4l2element);
586 /* emit a signal! whoopie! */
587 g_signal_emit (G_OBJECT (v4l2element),
588 gst_v4l2element_signals[SIGNAL_OPEN], 0, v4l2element->device);
590 case GST_STATE_READY_TO_NULL:
592 gst_v4l2_xoverlay_close (v4l2element);
595 if (!gst_v4l2_close (v4l2element))
596 return GST_STATE_FAILURE;
598 /* emit yet another signal! wheehee! */
599 g_signal_emit (G_OBJECT (v4l2element),
600 gst_v4l2element_signals[SIGNAL_CLOSE], 0, v4l2element->device);
604 if (GST_ELEMENT_CLASS (parent_class)->change_state)
605 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
607 return GST_STATE_SUCCESS;