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", input.std);
149 GST_LOG_OBJECT (e, " status: %08x", input.status);
151 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
152 channel = GST_TUNER_CHANNEL (v4l2channel);
153 channel->label = g_strdup ((const gchar *) input.name);
154 channel->flags = GST_TUNER_CHANNEL_INPUT;
155 v4l2channel->index = n;
157 if (input.type == V4L2_INPUT_TYPE_TUNER) {
158 struct v4l2_tuner vtun;
160 v4l2channel->tuner = input.tuner;
161 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
163 vtun.index = input.tuner;
164 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
165 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
166 (_("Failed to get setting of tuner %d on device '%s'."),
167 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
168 g_object_unref (G_OBJECT (channel));
172 channel->freq_multiplicator =
173 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
174 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
175 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
176 channel->min_signal = 0;
177 channel->max_signal = 0xffff;
179 if (input.audioset) {
180 /* we take the first. We don't care for
181 * the others for now */
182 while (!(input.audioset & (1 << v4l2channel->audio)))
183 v4l2channel->audio++;
184 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
187 v4l2object->channels =
188 g_list_prepend (v4l2object->channels, (gpointer) channel);
190 v4l2object->channels = g_list_reverse (v4l2object->channels);
192 GST_DEBUG_OBJECT (e, " norms");
195 struct v4l2_standard standard = { 0, };
196 GstV4l2TunerNorm *v4l2norm;
200 /* fill in defaults */
201 standard.frameperiod.numerator = 1;
202 standard.frameperiod.denominator = 0;
205 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
206 if (errno == EINVAL || errno == ENOTTY)
207 break; /* end of enumeration */
209 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
210 (_("Failed to query norm on device '%s'."),
211 v4l2object->videodev),
212 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
213 n, v4l2object->videodev, errno, strerror (errno)));
218 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
219 standard.name, standard.frameperiod.denominator,
220 standard.frameperiod.numerator);
222 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
223 norm = GST_TUNER_NORM (v4l2norm);
224 norm->label = g_strdup ((const gchar *) standard.name);
225 gst_value_set_fraction (&norm->framerate,
226 standard.frameperiod.denominator, standard.frameperiod.numerator);
227 v4l2norm->index = standard.id;
229 GST_DEBUG_OBJECT (v4l2object->element, "index=%08x, label=%s",
230 (unsigned int) v4l2norm->index, norm->label);
232 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
234 v4l2object->norms = g_list_reverse (v4l2object->norms);
236 GST_DEBUG_OBJECT (e, " controls+menus");
238 /* and lastly, controls+menus (if appropriate) */
239 for (n = V4L2_CID_BASE;; n++) {
240 struct v4l2_queryctrl control = { 0, };
241 GstV4l2ColorBalanceChannel *v4l2channel;
242 GstColorBalanceChannel *channel;
244 /* when we reached the last official CID, continue with private CIDs */
245 if (n == V4L2_CID_LASTP1) {
246 GST_DEBUG_OBJECT (e, "checking private CIDs");
247 n = V4L2_CID_PRIVATE_BASE;
249 GST_DEBUG_OBJECT (e, "checking control %08x", n);
252 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
253 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
254 if (n < V4L2_CID_PRIVATE_BASE) {
255 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
256 /* continue so that we also check private controls */
259 GST_DEBUG_OBJECT (e, "controls finished");
263 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
264 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
268 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
269 GST_DEBUG_OBJECT (e, "skipping disabled control");
274 case V4L2_CID_BRIGHTNESS:
275 case V4L2_CID_CONTRAST:
276 case V4L2_CID_SATURATION:
278 case V4L2_CID_BLACK_LEVEL:
279 case V4L2_CID_AUTO_WHITE_BALANCE:
280 case V4L2_CID_DO_WHITE_BALANCE:
281 case V4L2_CID_RED_BALANCE:
282 case V4L2_CID_BLUE_BALANCE:
284 case V4L2_CID_EXPOSURE:
285 case V4L2_CID_AUTOGAIN:
287 #ifdef V4L2_CID_SHARPNESS
288 case V4L2_CID_SHARPNESS:
290 /* we only handle these for now (why?) */
294 #ifndef V4L2_CID_PAN_RESET
295 case V4L2_CID_HCENTER:
297 #ifndef V4L2_CID_TILT_RESET
298 case V4L2_CID_VCENTER:
300 #ifdef V4L2_CID_PAN_RESET
301 case V4L2_CID_PAN_RESET:
303 #ifdef V4L2_CID_TILT_RESET
304 case V4L2_CID_TILT_RESET:
306 /* not handled here, handled by VideoOrientation interface */
309 case V4L2_CID_AUDIO_VOLUME:
310 case V4L2_CID_AUDIO_BALANCE:
311 case V4L2_CID_AUDIO_BASS:
312 case V4L2_CID_AUDIO_TREBLE:
313 case V4L2_CID_AUDIO_MUTE:
314 case V4L2_CID_AUDIO_LOUDNESS:
315 /* FIXME: We should implement GstMixer interface */
319 "ControlID %s (%x) unhandled, FIXME", control.name, n);
326 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
327 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
328 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
329 channel->label = g_strdup ((const gchar *) control.name);
333 /* FIXME: it will be need just when handling private controls
334 *(currently none of base controls are of this type) */
335 if (control.type == V4L2_CTRL_TYPE_MENU) {
336 struct v4l2_querymenu menu, *mptr;
343 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
345 break; /* end of enumeration */
347 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
348 (_("Failed getting controls attributes on device '%s'."),
349 v4l2object->videodev),
350 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
351 n, v4l2object->videodev, errno, strerror (errno)));
355 mptr = g_malloc (sizeof (menu));
356 memcpy (mptr, &menu, sizeof (menu));
357 menus = g_list_append (menus, mptr);
360 v4l2object->menus = g_list_append (v4l2object->menus, menus);
363 switch (control.type) {
364 case V4L2_CTRL_TYPE_INTEGER:
365 channel->min_value = control.minimum;
366 channel->max_value = control.maximum;
368 case V4L2_CTRL_TYPE_BOOLEAN:
369 channel->min_value = FALSE;
370 channel->max_value = TRUE;
373 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
374 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
375 unset (0), but can't be queried */
377 "Control with non supported type %s (%x), type=%d",
378 control.name, n, control.type);
379 channel->min_value = channel->max_value = 0;
384 g_list_prepend (v4l2object->colors, (gpointer) channel);
386 v4l2object->colors = g_list_reverse (v4l2object->colors);
388 GST_DEBUG_OBJECT (e, "done");
394 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
396 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
398 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
399 g_list_free (v4l2object->channels);
400 v4l2object->channels = NULL;
402 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
403 g_list_free (v4l2object->norms);
404 v4l2object->norms = NULL;
406 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
407 g_list_free (v4l2object->colors);
408 v4l2object->colors = NULL;
411 /******************************************************
413 * open the video device (v4l2object->videodev)
414 * return value: TRUE on success, FALSE on error
415 ******************************************************/
417 gst_v4l2_open (GstV4l2Object * v4l2object)
421 GstPollFD pollfd = GST_POLL_FD_INIT;
423 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
424 v4l2object->videodev);
426 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
427 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
429 /* be sure we have a device */
430 if (!v4l2object->videodev)
431 v4l2object->videodev = g_strdup ("/dev/video");
433 /* check if it is a device */
434 if (stat (v4l2object->videodev, &st) == -1)
437 if (!S_ISCHR (st.st_mode))
440 /* open the device */
441 v4l2object->video_fd =
442 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
444 if (!GST_V4L2_IS_OPEN (v4l2object))
447 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
448 V4L2_ENABLE_ENUM_FMT_EMULATION);
449 /* Note the v4l2_xxx functions are designed so that if they get passed an
450 unknown fd, the will behave exactly as their regular xxx counterparts, so
451 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
452 cam format to normal formats conversion). Chances are big we will still
453 fail then though, as normally v4l2_fd_open only fails if the device is not
455 if (libv4l2_fd != -1)
456 v4l2object->video_fd = libv4l2_fd;
458 v4l2object->can_poll_device = TRUE;
460 /* get capabilities, error will be posted */
461 if (!gst_v4l2_get_capabilities (v4l2object))
464 /* do we need to be a capture device? */
465 if (GST_IS_V4L2SRC (v4l2object->element) &&
466 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
469 if (GST_IS_V4L2SINK (v4l2object->element) &&
470 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
473 /* create enumerations, posts errors. */
474 if (!gst_v4l2_fill_lists (v4l2object))
477 GST_INFO_OBJECT (v4l2object->element,
478 "Opened device '%s' (%s) successfully",
479 v4l2object->vcap.card, v4l2object->videodev);
481 pollfd.fd = v4l2object->video_fd;
482 gst_poll_add_fd (v4l2object->poll, &pollfd);
483 gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
490 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
491 (_("Cannot identify device '%s'."), v4l2object->videodev),
497 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
498 (_("This isn't a device '%s'."), v4l2object->videodev),
504 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
505 (_("Could not open device '%s' for reading and writing."),
506 v4l2object->videodev), GST_ERROR_SYSTEM);
511 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
512 (_("Device '%s' is not a capture device."),
513 v4l2object->videodev),
514 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
519 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
520 (_("Device '%s' is not a output device."),
521 v4l2object->videodev),
522 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
527 if (GST_V4L2_IS_OPEN (v4l2object)) {
529 v4l2_close (v4l2object->video_fd);
530 v4l2object->video_fd = -1;
533 gst_v4l2_empty_lists (v4l2object);
540 /******************************************************
542 * close the video device (v4l2object->video_fd)
543 * return value: TRUE on success, FALSE on error
544 ******************************************************/
546 gst_v4l2_close (GstV4l2Object * v4l2object)
548 GstPollFD pollfd = GST_POLL_FD_INIT;
549 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
550 v4l2object->videodev);
552 GST_V4L2_CHECK_OPEN (v4l2object);
553 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
556 v4l2_close (v4l2object->video_fd);
557 pollfd.fd = v4l2object->video_fd;
558 gst_poll_remove_fd (v4l2object->poll, &pollfd);
559 v4l2object->video_fd = -1;
562 gst_v4l2_empty_lists (v4l2object);
568 /******************************************************
569 * gst_v4l2_get_norm()
570 * Get the norm of the current device
571 * return value: TRUE on success, FALSE on error
572 ******************************************************/
574 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
576 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
578 if (!GST_V4L2_IS_OPEN (v4l2object))
581 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
589 GST_DEBUG ("Failed to get the current norm for device %s",
590 v4l2object->videodev);
596 /******************************************************
597 * gst_v4l2_set_norm()
598 * Set the norm of the current device
599 * return value: TRUE on success, FALSE on error
600 ******************************************************/
602 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
604 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
605 "%" G_GINT64_MODIFIER "x", (guint64) norm);
607 if (!GST_V4L2_IS_OPEN (v4l2object))
610 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
618 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
619 (_("Failed to set norm for device '%s'."),
620 v4l2object->videodev), GST_ERROR_SYSTEM);
625 /******************************************************
626 * gst_v4l2_get_frequency():
627 * get the current frequency
628 * return value: TRUE on success, FALSE on error
629 ******************************************************/
631 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
632 gint tunernum, gulong * frequency)
634 struct v4l2_frequency freq = { 0, };
636 GstTunerChannel *channel;
638 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
640 if (!GST_V4L2_IS_OPEN (v4l2object))
643 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
645 freq.tuner = tunernum;
646 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
649 *frequency = freq.frequency * channel->freq_multiplicator;
656 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
657 (_("Failed to get current tuner frequency for device '%s'."),
658 v4l2object->videodev), GST_ERROR_SYSTEM);
664 /******************************************************
665 * gst_v4l2_set_frequency():
667 * return value: TRUE on success, FALSE on error
668 ******************************************************/
670 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
671 gint tunernum, gulong frequency)
673 struct v4l2_frequency freq = { 0, };
675 GstTunerChannel *channel;
677 GST_DEBUG_OBJECT (v4l2object->element,
678 "setting current tuner frequency to %lu", frequency);
680 if (!GST_V4L2_IS_OPEN (v4l2object))
683 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
685 freq.tuner = tunernum;
686 /* fill in type - ignore error */
687 v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
688 freq.frequency = frequency / channel->freq_multiplicator;
690 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
698 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
699 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
700 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
705 /******************************************************
706 * gst_v4l2_signal_strength():
707 * get the strength of the signal on the current input
708 * return value: TRUE on success, FALSE on error
709 ******************************************************/
711 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
712 gint tunernum, gulong * signal_strength)
714 struct v4l2_tuner tuner = { 0, };
716 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
718 if (!GST_V4L2_IS_OPEN (v4l2object))
721 tuner.index = tunernum;
722 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
725 *signal_strength = tuner.signal;
732 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
733 (_("Failed to get signal strength for device '%s'."),
734 v4l2object->videodev), GST_ERROR_SYSTEM);
739 /******************************************************
740 * gst_v4l2_get_attribute():
741 * try to get the value of one specific attribute
742 * return value: TRUE on success, FALSE on error
743 ******************************************************/
745 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
746 int attribute_num, int *value)
748 struct v4l2_control control = { 0, };
750 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
753 if (!GST_V4L2_IS_OPEN (v4l2object))
756 control.id = attribute_num;
758 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
761 *value = control.value;
768 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
769 (_("Failed to get value for control %d on device '%s'."),
770 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
776 /******************************************************
777 * gst_v4l2_set_attribute():
778 * try to set the value of one specific attribute
779 * return value: TRUE on success, FALSE on error
780 ******************************************************/
782 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
783 int attribute_num, const int value)
785 struct v4l2_control control = { 0, };
787 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
788 attribute_num, value);
790 if (!GST_V4L2_IS_OPEN (v4l2object))
793 control.id = attribute_num;
794 control.value = value;
795 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
803 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
804 (_("Failed to set value %d for control %d on device '%s'."),
805 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
811 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
815 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
817 if (!GST_V4L2_IS_OPEN (v4l2object))
820 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
825 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
831 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
832 /* only give a warning message if driver actually claims to have tuner
835 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
836 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
842 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
844 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
846 if (!GST_V4L2_IS_OPEN (v4l2object))
849 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
856 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
857 /* only give a warning message if driver actually claims to have tuner
860 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
861 (_("Failed to set input %d on device %s."),
862 input, v4l2object->videodev), GST_ERROR_SYSTEM);
868 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
872 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
874 if (!GST_V4L2_IS_OPEN (v4l2object))
877 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
882 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
888 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
889 /* only give a warning message if driver actually claims to have tuner
892 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
893 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
899 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
901 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
903 if (!GST_V4L2_IS_OPEN (v4l2object))
906 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
913 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
914 /* only give a warning message if driver actually claims to have tuner
917 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
918 (_("Failed to set output %d on device %s."),
919 output, v4l2object->videodev), GST_ERROR_SYSTEM);