3 * Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
6 * v4l2_calls.c - generic V4L2 calls handling
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
28 #include <sys/types.h>
31 #include <sys/ioctl.h>
37 /* Needed on older Solaris Nevada builds (72 at least) */
39 #include <sys/ioccom.h>
41 #include "v4l2_calls.h"
42 #include "gstv4l2tuner.h"
44 #include "gstv4l2xoverlay.h"
46 #include "gstv4l2colorbalance.h"
48 #include "gstv4l2src.h"
49 #include "gstv4l2sink.h"
51 #include "gst/gst-i18n-plugin.h"
53 /* Those are ioctl calls */
54 #ifndef V4L2_CID_HCENTER
55 #define V4L2_CID_HCENTER V4L2_CID_HCENTER_DEPRECATED
57 #ifndef V4L2_CID_VCENTER
58 #define V4L2_CID_VCENTER V4L2_CID_VCENTER_DEPRECATED
61 GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
62 #define GST_CAT_DEFAULT v4l2_debug
64 /******************************************************
65 * gst_v4l2_get_capabilities():
66 * get the device's capturing capabilities
67 * return value: TRUE on success, FALSE on error
68 ******************************************************/
70 gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
74 e = v4l2object->element;
76 GST_DEBUG_OBJECT (e, "getting capabilities");
78 if (!GST_V4L2_IS_OPEN (v4l2object))
81 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
84 GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver);
85 GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card);
86 GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info);
87 GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version);
88 GST_LOG_OBJECT (e, "capabilites: %08x", v4l2object->vcap.capabilities);
95 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
96 (_("Error getting capabilities for device '%s': "
97 "It isn't a v4l2 driver. Check if it is a v4l1 driver."),
98 v4l2object->videodev), GST_ERROR_SYSTEM);
104 /******************************************************
105 * gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
106 * fill/empty the lists of enumerations
107 * return value: TRUE on success, FALSE on error
108 ******************************************************/
110 gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
116 e = v4l2object->element;
118 GST_DEBUG_OBJECT (e, "getting enumerations");
119 GST_V4L2_CHECK_OPEN (v4l2object);
121 GST_DEBUG_OBJECT (e, " channels");
122 /* and now, the channels */
124 struct v4l2_input input;
125 GstV4l2TunerChannel *v4l2channel;
126 GstTunerChannel *channel;
128 memset (&input, 0, sizeof (input));
131 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
132 if (errno == EINVAL || errno == ENOTTY)
133 break; /* end of enumeration */
135 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
136 (_("Failed to query attributes of input %d in device %s"),
137 n, v4l2object->videodev),
138 ("Failed to get %d in input enumeration for %s. (%d - %s)",
139 n, v4l2object->videodev, errno, strerror (errno)));
144 GST_LOG_OBJECT (e, " index: %d", input.index);
145 GST_LOG_OBJECT (e, " name: '%s'", input.name);
146 GST_LOG_OBJECT (e, " type: %08x", input.type);
147 GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
148 GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
149 (guint64) input.std);
150 GST_LOG_OBJECT (e, " status: %08x", input.status);
152 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
153 channel = GST_TUNER_CHANNEL (v4l2channel);
154 channel->label = g_strdup ((const gchar *) input.name);
155 channel->flags = GST_TUNER_CHANNEL_INPUT;
156 v4l2channel->index = n;
158 if (input.type == V4L2_INPUT_TYPE_TUNER) {
159 struct v4l2_tuner vtun;
161 v4l2channel->tuner = input.tuner;
162 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
164 vtun.index = input.tuner;
165 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
166 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
167 (_("Failed to get setting of tuner %d on device '%s'."),
168 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
169 g_object_unref (G_OBJECT (channel));
173 channel->freq_multiplicator =
174 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
175 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
176 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
177 channel->min_signal = 0;
178 channel->max_signal = 0xffff;
180 if (input.audioset) {
181 /* we take the first. We don't care for
182 * the others for now */
183 while (!(input.audioset & (1 << v4l2channel->audio)))
184 v4l2channel->audio++;
185 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
188 v4l2object->channels =
189 g_list_prepend (v4l2object->channels, (gpointer) channel);
191 v4l2object->channels = g_list_reverse (v4l2object->channels);
193 GST_DEBUG_OBJECT (e, " norms");
196 struct v4l2_standard standard = { 0, };
197 GstV4l2TunerNorm *v4l2norm;
201 /* fill in defaults */
202 standard.frameperiod.numerator = 1;
203 standard.frameperiod.denominator = 0;
206 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
207 if (errno == EINVAL || errno == ENOTTY || errno == ENODATA)
208 break; /* end of enumeration */
210 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
211 (_("Failed to query norm on device '%s'."),
212 v4l2object->videodev),
213 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
214 n, v4l2object->videodev, errno, strerror (errno)));
219 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
220 standard.name, standard.frameperiod.denominator,
221 standard.frameperiod.numerator);
223 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
224 norm = GST_TUNER_NORM (v4l2norm);
225 norm->label = g_strdup ((const gchar *) standard.name);
226 gst_value_set_fraction (&norm->framerate,
227 standard.frameperiod.denominator, standard.frameperiod.numerator);
228 v4l2norm->index = standard.id;
230 GST_DEBUG_OBJECT (v4l2object->element, "index=%08x, label=%s",
231 (unsigned int) v4l2norm->index, norm->label);
233 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
235 v4l2object->norms = g_list_reverse (v4l2object->norms);
237 GST_DEBUG_OBJECT (e, " controls+menus");
239 /* and lastly, controls+menus (if appropriate) */
240 for (n = V4L2_CID_BASE;; n++) {
241 struct v4l2_queryctrl control = { 0, };
242 GstV4l2ColorBalanceChannel *v4l2channel;
243 GstColorBalanceChannel *channel;
245 /* when we reached the last official CID, continue with private CIDs */
246 if (n == V4L2_CID_LASTP1) {
247 GST_DEBUG_OBJECT (e, "checking private CIDs");
248 n = V4L2_CID_PRIVATE_BASE;
250 GST_DEBUG_OBJECT (e, "checking control %08x", n);
253 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
254 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
255 if (n < V4L2_CID_PRIVATE_BASE) {
256 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
257 /* continue so that we also check private controls */
260 GST_DEBUG_OBJECT (e, "controls finished");
264 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
265 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
269 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
270 GST_DEBUG_OBJECT (e, "skipping disabled control");
275 case V4L2_CID_BRIGHTNESS:
276 case V4L2_CID_CONTRAST:
277 case V4L2_CID_SATURATION:
279 case V4L2_CID_BLACK_LEVEL:
280 case V4L2_CID_AUTO_WHITE_BALANCE:
281 case V4L2_CID_DO_WHITE_BALANCE:
282 case V4L2_CID_RED_BALANCE:
283 case V4L2_CID_BLUE_BALANCE:
285 case V4L2_CID_EXPOSURE:
286 case V4L2_CID_AUTOGAIN:
288 #ifdef V4L2_CID_SHARPNESS
289 case V4L2_CID_SHARPNESS:
291 /* we only handle these for now (why?) */
295 #ifndef V4L2_CID_PAN_RESET
296 case V4L2_CID_HCENTER:
298 #ifndef V4L2_CID_TILT_RESET
299 case V4L2_CID_VCENTER:
301 #ifdef V4L2_CID_PAN_RESET
302 case V4L2_CID_PAN_RESET:
304 #ifdef V4L2_CID_TILT_RESET
305 case V4L2_CID_TILT_RESET:
307 /* not handled here, handled by VideoOrientation interface */
310 case V4L2_CID_AUDIO_VOLUME:
311 case V4L2_CID_AUDIO_BALANCE:
312 case V4L2_CID_AUDIO_BASS:
313 case V4L2_CID_AUDIO_TREBLE:
314 case V4L2_CID_AUDIO_MUTE:
315 case V4L2_CID_AUDIO_LOUDNESS:
316 /* FIXME: We should implement GstMixer interface */
320 "ControlID %s (%x) unhandled, FIXME", control.name, n);
327 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
328 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
329 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
330 channel->label = g_strdup ((const gchar *) control.name);
334 /* FIXME: it will be need just when handling private controls
335 *(currently none of base controls are of this type) */
336 if (control.type == V4L2_CTRL_TYPE_MENU) {
337 struct v4l2_querymenu menu, *mptr;
344 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
346 break; /* end of enumeration */
348 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
349 (_("Failed getting controls attributes on device '%s'."),
350 v4l2object->videodev),
351 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
352 n, v4l2object->videodev, errno, strerror (errno)));
356 mptr = g_malloc (sizeof (menu));
357 memcpy (mptr, &menu, sizeof (menu));
358 menus = g_list_append (menus, mptr);
361 v4l2object->menus = g_list_append (v4l2object->menus, menus);
364 switch (control.type) {
365 case V4L2_CTRL_TYPE_INTEGER:
366 channel->min_value = control.minimum;
367 channel->max_value = control.maximum;
369 case V4L2_CTRL_TYPE_BOOLEAN:
370 channel->min_value = FALSE;
371 channel->max_value = TRUE;
374 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
375 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
376 unset (0), but can't be queried */
378 "Control with non supported type %s (%x), type=%d",
379 control.name, n, control.type);
380 channel->min_value = channel->max_value = 0;
385 g_list_prepend (v4l2object->colors, (gpointer) channel);
387 v4l2object->colors = g_list_reverse (v4l2object->colors);
389 GST_DEBUG_OBJECT (e, "done");
395 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
397 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
399 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
400 g_list_free (v4l2object->channels);
401 v4l2object->channels = NULL;
403 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
404 g_list_free (v4l2object->norms);
405 v4l2object->norms = NULL;
407 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
408 g_list_free (v4l2object->colors);
409 v4l2object->colors = NULL;
412 /******************************************************
414 * open the video device (v4l2object->videodev)
415 * return value: TRUE on success, FALSE on error
416 ******************************************************/
418 gst_v4l2_open (GstV4l2Object * v4l2object)
422 GstPollFD pollfd = GST_POLL_FD_INIT;
424 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
425 v4l2object->videodev);
427 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
428 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
430 /* be sure we have a device */
431 if (!v4l2object->videodev)
432 v4l2object->videodev = g_strdup ("/dev/video");
434 /* check if it is a device */
435 if (stat (v4l2object->videodev, &st) == -1)
438 if (!S_ISCHR (st.st_mode))
441 /* open the device */
442 v4l2object->video_fd =
443 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
445 if (!GST_V4L2_IS_OPEN (v4l2object))
448 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
449 V4L2_ENABLE_ENUM_FMT_EMULATION);
450 /* Note the v4l2_xxx functions are designed so that if they get passed an
451 unknown fd, the will behave exactly as their regular xxx counterparts, so
452 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
453 cam format to normal formats conversion). Chances are big we will still
454 fail then though, as normally v4l2_fd_open only fails if the device is not
456 if (libv4l2_fd != -1)
457 v4l2object->video_fd = libv4l2_fd;
459 v4l2object->can_poll_device = TRUE;
461 /* get capabilities, error will be posted */
462 if (!gst_v4l2_get_capabilities (v4l2object))
465 /* do we need to be a capture device? */
466 if (GST_IS_V4L2SRC (v4l2object->element) &&
467 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
470 if (GST_IS_V4L2SINK (v4l2object->element) &&
471 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
474 /* create enumerations, posts errors. */
475 if (!gst_v4l2_fill_lists (v4l2object))
478 GST_INFO_OBJECT (v4l2object->element,
479 "Opened device '%s' (%s) successfully",
480 v4l2object->vcap.card, v4l2object->videodev);
482 pollfd.fd = v4l2object->video_fd;
483 gst_poll_add_fd (v4l2object->poll, &pollfd);
484 gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
491 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
492 (_("Cannot identify device '%s'."), v4l2object->videodev),
498 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
499 (_("This isn't a device '%s'."), v4l2object->videodev),
505 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
506 (_("Could not open device '%s' for reading and writing."),
507 v4l2object->videodev), GST_ERROR_SYSTEM);
512 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
513 (_("Device '%s' is not a capture device."),
514 v4l2object->videodev),
515 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
520 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
521 (_("Device '%s' is not a output device."),
522 v4l2object->videodev),
523 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
528 if (GST_V4L2_IS_OPEN (v4l2object)) {
530 v4l2_close (v4l2object->video_fd);
531 v4l2object->video_fd = -1;
534 gst_v4l2_empty_lists (v4l2object);
541 /******************************************************
543 * close the video device (v4l2object->video_fd)
544 * return value: TRUE on success, FALSE on error
545 ******************************************************/
547 gst_v4l2_close (GstV4l2Object * v4l2object)
549 GstPollFD pollfd = GST_POLL_FD_INIT;
550 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
551 v4l2object->videodev);
553 GST_V4L2_CHECK_OPEN (v4l2object);
554 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
557 v4l2_close (v4l2object->video_fd);
558 pollfd.fd = v4l2object->video_fd;
559 gst_poll_remove_fd (v4l2object->poll, &pollfd);
560 v4l2object->video_fd = -1;
563 gst_v4l2_empty_lists (v4l2object);
569 /******************************************************
570 * gst_v4l2_get_norm()
571 * Get the norm of the current device
572 * return value: TRUE on success, FALSE on error
573 ******************************************************/
575 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
577 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
579 if (!GST_V4L2_IS_OPEN (v4l2object))
582 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
590 GST_DEBUG ("Failed to get the current norm for device %s",
591 v4l2object->videodev);
597 /******************************************************
598 * gst_v4l2_set_norm()
599 * Set the norm of the current device
600 * return value: TRUE on success, FALSE on error
601 ******************************************************/
603 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
605 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
606 "%" G_GINT64_MODIFIER "x", (guint64) norm);
608 if (!GST_V4L2_IS_OPEN (v4l2object))
611 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
619 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
620 (_("Failed to set norm for device '%s'."),
621 v4l2object->videodev), GST_ERROR_SYSTEM);
626 /******************************************************
627 * gst_v4l2_get_frequency():
628 * get the current frequency
629 * return value: TRUE on success, FALSE on error
630 ******************************************************/
632 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
633 gint tunernum, gulong * frequency)
635 struct v4l2_frequency freq = { 0, };
637 GstTunerChannel *channel;
639 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
641 if (!GST_V4L2_IS_OPEN (v4l2object))
644 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
646 freq.tuner = tunernum;
647 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
650 *frequency = freq.frequency * channel->freq_multiplicator;
657 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
658 (_("Failed to get current tuner frequency for device '%s'."),
659 v4l2object->videodev), GST_ERROR_SYSTEM);
665 /******************************************************
666 * gst_v4l2_set_frequency():
668 * return value: TRUE on success, FALSE on error
669 ******************************************************/
671 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
672 gint tunernum, gulong frequency)
674 struct v4l2_frequency freq = { 0, };
676 GstTunerChannel *channel;
678 GST_DEBUG_OBJECT (v4l2object->element,
679 "setting current tuner frequency to %lu", frequency);
681 if (!GST_V4L2_IS_OPEN (v4l2object))
684 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
686 freq.tuner = tunernum;
687 /* fill in type - ignore error */
688 v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
689 freq.frequency = frequency / channel->freq_multiplicator;
691 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
699 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
700 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
701 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
706 /******************************************************
707 * gst_v4l2_signal_strength():
708 * get the strength of the signal on the current input
709 * return value: TRUE on success, FALSE on error
710 ******************************************************/
712 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
713 gint tunernum, gulong * signal_strength)
715 struct v4l2_tuner tuner = { 0, };
717 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
719 if (!GST_V4L2_IS_OPEN (v4l2object))
722 tuner.index = tunernum;
723 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
726 *signal_strength = tuner.signal;
733 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
734 (_("Failed to get signal strength for device '%s'."),
735 v4l2object->videodev), GST_ERROR_SYSTEM);
740 /******************************************************
741 * gst_v4l2_get_attribute():
742 * try to get the value of one specific attribute
743 * return value: TRUE on success, FALSE on error
744 ******************************************************/
746 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
747 int attribute_num, int *value)
749 struct v4l2_control control = { 0, };
751 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
754 if (!GST_V4L2_IS_OPEN (v4l2object))
757 control.id = attribute_num;
759 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
762 *value = control.value;
769 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
770 (_("Failed to get value for control %d on device '%s'."),
771 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
777 /******************************************************
778 * gst_v4l2_set_attribute():
779 * try to set the value of one specific attribute
780 * return value: TRUE on success, FALSE on error
781 ******************************************************/
783 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
784 int attribute_num, const int value)
786 struct v4l2_control control = { 0, };
788 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
789 attribute_num, value);
791 if (!GST_V4L2_IS_OPEN (v4l2object))
794 control.id = attribute_num;
795 control.value = value;
796 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
804 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
805 (_("Failed to set value %d for control %d on device '%s'."),
806 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
812 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
816 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
818 if (!GST_V4L2_IS_OPEN (v4l2object))
821 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
826 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
832 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
833 /* only give a warning message if driver actually claims to have tuner
836 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
837 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
843 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
845 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
847 if (!GST_V4L2_IS_OPEN (v4l2object))
850 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
857 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
858 /* only give a warning message if driver actually claims to have tuner
861 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
862 (_("Failed to set input %d on device %s."),
863 input, v4l2object->videodev), GST_ERROR_SYSTEM);
869 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
873 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
875 if (!GST_V4L2_IS_OPEN (v4l2object))
878 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
883 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
889 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
890 /* only give a warning message if driver actually claims to have tuner
893 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
894 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
900 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
902 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
904 if (!GST_V4L2_IS_OPEN (v4l2object))
907 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
914 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
915 /* only give a warning message if driver actually claims to have tuner
918 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
919 (_("Failed to set output %d on device %s."),
920 output, v4l2object->videodev), GST_ERROR_SYSTEM);