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");
273 switch (control.type) {
274 case V4L2_CTRL_TYPE_INTEGER:
275 case V4L2_CTRL_TYPE_BOOLEAN:
276 case V4L2_CTRL_TYPE_MENU:
277 case V4L2_CTRL_TYPE_INTEGER_MENU:
278 case V4L2_CTRL_TYPE_BITMASK:
279 case V4L2_CTRL_TYPE_BUTTON:{
281 control.name[31] = '\0';
282 for (i = 0; control.name[i]; ++i) {
283 control.name[i] = g_ascii_tolower (control.name[i]);
284 if (!g_ascii_isalnum (control.name[i]))
285 control.name[i] = '_';
287 GST_INFO_OBJECT (e, "adding generic controls '%s'", control.name);
288 g_datalist_id_set_data (&v4l2object->controls,
289 g_quark_from_string ((const gchar *) control.name),
290 GINT_TO_POINTER (n));
295 "Control type for '%s' not suppored for extra controls.",
301 case V4L2_CID_BRIGHTNESS:
302 case V4L2_CID_CONTRAST:
303 case V4L2_CID_SATURATION:
305 case V4L2_CID_BLACK_LEVEL:
306 case V4L2_CID_AUTO_WHITE_BALANCE:
307 case V4L2_CID_DO_WHITE_BALANCE:
308 case V4L2_CID_RED_BALANCE:
309 case V4L2_CID_BLUE_BALANCE:
311 case V4L2_CID_EXPOSURE:
312 case V4L2_CID_AUTOGAIN:
314 #ifdef V4L2_CID_SHARPNESS
315 case V4L2_CID_SHARPNESS:
317 /* we only handle these for now (why?) */
321 #ifndef V4L2_CID_PAN_RESET
322 case V4L2_CID_HCENTER:
324 #ifndef V4L2_CID_TILT_RESET
325 case V4L2_CID_VCENTER:
327 #ifdef V4L2_CID_PAN_RESET
328 case V4L2_CID_PAN_RESET:
330 #ifdef V4L2_CID_TILT_RESET
331 case V4L2_CID_TILT_RESET:
333 /* not handled here, handled by VideoOrientation interface */
336 case V4L2_CID_AUDIO_VOLUME:
337 case V4L2_CID_AUDIO_BALANCE:
338 case V4L2_CID_AUDIO_BASS:
339 case V4L2_CID_AUDIO_TREBLE:
340 case V4L2_CID_AUDIO_MUTE:
341 case V4L2_CID_AUDIO_LOUDNESS:
342 /* FIXME: We should implement GstMixer interface */
346 "ControlID %s (%x) unhandled, FIXME", control.name, n);
353 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
354 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
355 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
356 channel->label = g_strdup ((const gchar *) control.name);
360 /* FIXME: it will be need just when handling private controls
361 *(currently none of base controls are of this type) */
362 if (control.type == V4L2_CTRL_TYPE_MENU) {
363 struct v4l2_querymenu menu, *mptr;
370 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
372 break; /* end of enumeration */
374 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
375 (_("Failed getting controls attributes on device '%s'."),
376 v4l2object->videodev),
377 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
378 n, v4l2object->videodev, errno, strerror (errno)));
382 mptr = g_malloc (sizeof (menu));
383 memcpy (mptr, &menu, sizeof (menu));
384 menus = g_list_append (menus, mptr);
387 v4l2object->menus = g_list_append (v4l2object->menus, menus);
390 switch (control.type) {
391 case V4L2_CTRL_TYPE_INTEGER:
392 channel->min_value = control.minimum;
393 channel->max_value = control.maximum;
395 case V4L2_CTRL_TYPE_BOOLEAN:
396 channel->min_value = FALSE;
397 channel->max_value = TRUE;
400 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
401 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
402 unset (0), but can't be queried */
404 "Control with non supported type %s (%x), type=%d",
405 control.name, n, control.type);
406 channel->min_value = channel->max_value = 0;
411 g_list_prepend (v4l2object->colors, (gpointer) channel);
413 v4l2object->colors = g_list_reverse (v4l2object->colors);
415 GST_DEBUG_OBJECT (e, "done");
421 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
423 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
425 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
426 g_list_free (v4l2object->channels);
427 v4l2object->channels = NULL;
429 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
430 g_list_free (v4l2object->norms);
431 v4l2object->norms = NULL;
433 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
434 g_list_free (v4l2object->colors);
435 v4l2object->colors = NULL;
437 g_datalist_clear (&v4l2object->controls);
440 /******************************************************
442 * open the video device (v4l2object->videodev)
443 * return value: TRUE on success, FALSE on error
444 ******************************************************/
446 gst_v4l2_open (GstV4l2Object * v4l2object)
450 GstPollFD pollfd = GST_POLL_FD_INIT;
452 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
453 v4l2object->videodev);
455 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
456 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
458 /* be sure we have a device */
459 if (!v4l2object->videodev)
460 v4l2object->videodev = g_strdup ("/dev/video");
462 /* check if it is a device */
463 if (stat (v4l2object->videodev, &st) == -1)
466 if (!S_ISCHR (st.st_mode))
469 /* open the device */
470 v4l2object->video_fd =
471 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
473 if (!GST_V4L2_IS_OPEN (v4l2object))
476 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
477 V4L2_ENABLE_ENUM_FMT_EMULATION);
478 /* Note the v4l2_xxx functions are designed so that if they get passed an
479 unknown fd, the will behave exactly as their regular xxx counterparts, so
480 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
481 cam format to normal formats conversion). Chances are big we will still
482 fail then though, as normally v4l2_fd_open only fails if the device is not
484 if (libv4l2_fd != -1)
485 v4l2object->video_fd = libv4l2_fd;
487 v4l2object->can_poll_device = TRUE;
489 /* get capabilities, error will be posted */
490 if (!gst_v4l2_get_capabilities (v4l2object))
493 /* do we need to be a capture device? */
494 if (GST_IS_V4L2SRC (v4l2object->element) &&
495 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
498 if (GST_IS_V4L2SINK (v4l2object->element) &&
499 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
502 /* create enumerations, posts errors. */
503 if (!gst_v4l2_fill_lists (v4l2object))
506 GST_INFO_OBJECT (v4l2object->element,
507 "Opened device '%s' (%s) successfully",
508 v4l2object->vcap.card, v4l2object->videodev);
510 pollfd.fd = v4l2object->video_fd;
511 gst_poll_add_fd (v4l2object->poll, &pollfd);
512 if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
513 gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
515 gst_poll_fd_ctl_write (v4l2object->poll, &pollfd, TRUE);
517 if (v4l2object->extra_controls)
518 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
525 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
526 (_("Cannot identify device '%s'."), v4l2object->videodev),
532 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
533 (_("This isn't a device '%s'."), v4l2object->videodev),
539 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
540 (_("Could not open device '%s' for reading and writing."),
541 v4l2object->videodev), GST_ERROR_SYSTEM);
546 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
547 (_("Device '%s' is not a capture device."),
548 v4l2object->videodev),
549 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
554 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
555 (_("Device '%s' is not a output device."),
556 v4l2object->videodev),
557 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
562 if (GST_V4L2_IS_OPEN (v4l2object)) {
564 v4l2_close (v4l2object->video_fd);
565 v4l2object->video_fd = -1;
568 gst_v4l2_empty_lists (v4l2object);
575 /******************************************************
577 * close the video device (v4l2object->video_fd)
578 * return value: TRUE on success, FALSE on error
579 ******************************************************/
581 gst_v4l2_close (GstV4l2Object * v4l2object)
583 GstPollFD pollfd = GST_POLL_FD_INIT;
584 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
585 v4l2object->videodev);
587 GST_V4L2_CHECK_OPEN (v4l2object);
588 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
591 v4l2_close (v4l2object->video_fd);
592 pollfd.fd = v4l2object->video_fd;
593 gst_poll_remove_fd (v4l2object->poll, &pollfd);
594 v4l2object->video_fd = -1;
597 gst_v4l2_empty_lists (v4l2object);
603 /******************************************************
604 * gst_v4l2_get_norm()
605 * Get the norm of the current device
606 * return value: TRUE on success, FALSE on error
607 ******************************************************/
609 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
611 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
613 if (!GST_V4L2_IS_OPEN (v4l2object))
616 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
624 GST_DEBUG ("Failed to get the current norm for device %s",
625 v4l2object->videodev);
631 /******************************************************
632 * gst_v4l2_set_norm()
633 * Set the norm of the current device
634 * return value: TRUE on success, FALSE on error
635 ******************************************************/
637 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
639 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
640 "%" G_GINT64_MODIFIER "x", (guint64) norm);
642 if (!GST_V4L2_IS_OPEN (v4l2object))
645 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
653 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
654 (_("Failed to set norm for device '%s'."),
655 v4l2object->videodev), GST_ERROR_SYSTEM);
660 /******************************************************
661 * gst_v4l2_get_frequency():
662 * get the current frequency
663 * return value: TRUE on success, FALSE on error
664 ******************************************************/
666 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
667 gint tunernum, gulong * frequency)
669 struct v4l2_frequency freq = { 0, };
671 GstTunerChannel *channel;
673 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
675 if (!GST_V4L2_IS_OPEN (v4l2object))
678 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
680 freq.tuner = tunernum;
681 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
684 *frequency = freq.frequency * channel->freq_multiplicator;
691 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
692 (_("Failed to get current tuner frequency for device '%s'."),
693 v4l2object->videodev), GST_ERROR_SYSTEM);
699 /******************************************************
700 * gst_v4l2_set_frequency():
702 * return value: TRUE on success, FALSE on error
703 ******************************************************/
705 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
706 gint tunernum, gulong frequency)
708 struct v4l2_frequency freq = { 0, };
710 GstTunerChannel *channel;
712 GST_DEBUG_OBJECT (v4l2object->element,
713 "setting current tuner frequency to %lu", frequency);
715 if (!GST_V4L2_IS_OPEN (v4l2object))
718 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
720 freq.tuner = tunernum;
721 /* fill in type - ignore error */
722 v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
723 freq.frequency = frequency / channel->freq_multiplicator;
725 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
733 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
734 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
735 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
740 /******************************************************
741 * gst_v4l2_signal_strength():
742 * get the strength of the signal on the current input
743 * return value: TRUE on success, FALSE on error
744 ******************************************************/
746 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
747 gint tunernum, gulong * signal_strength)
749 struct v4l2_tuner tuner = { 0, };
751 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
753 if (!GST_V4L2_IS_OPEN (v4l2object))
756 tuner.index = tunernum;
757 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
760 *signal_strength = tuner.signal;
767 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
768 (_("Failed to get signal strength for device '%s'."),
769 v4l2object->videodev), GST_ERROR_SYSTEM);
774 /******************************************************
775 * gst_v4l2_get_attribute():
776 * try to get the value of one specific attribute
777 * return value: TRUE on success, FALSE on error
778 ******************************************************/
780 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
781 int attribute_num, int *value)
783 struct v4l2_control control = { 0, };
785 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
788 if (!GST_V4L2_IS_OPEN (v4l2object))
791 control.id = attribute_num;
793 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
796 *value = control.value;
803 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
804 (_("Failed to get value for control %d on device '%s'."),
805 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
811 /******************************************************
812 * gst_v4l2_set_attribute():
813 * try to set the value of one specific attribute
814 * return value: TRUE on success, FALSE on error
815 ******************************************************/
817 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
818 int attribute_num, const int value)
820 struct v4l2_control control = { 0, };
822 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
823 attribute_num, value);
825 if (!GST_V4L2_IS_OPEN (v4l2object))
828 control.id = attribute_num;
829 control.value = value;
830 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
838 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
839 (_("Failed to set value %d for control %d on device '%s'."),
840 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
846 set_contol (GQuark field_id, const GValue * value, gpointer user_data)
848 GstV4l2Object *v4l2object = user_data;
849 gpointer *d = g_datalist_id_get_data (&v4l2object->controls, field_id);
851 GST_WARNING_OBJECT (v4l2object,
852 "Control '%s' does not exist or has an unsupported type.",
853 g_quark_to_string (field_id));
856 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
857 GST_WARNING_OBJECT (v4l2object,
858 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
861 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
862 g_value_get_int (value));
867 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
869 return gst_structure_foreach (controls, set_contol, v4l2object);
873 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
877 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
879 if (!GST_V4L2_IS_OPEN (v4l2object))
882 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
887 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
893 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
894 /* only give a warning message if driver actually claims to have tuner
897 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
898 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
904 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
906 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
908 if (!GST_V4L2_IS_OPEN (v4l2object))
911 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
918 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
919 /* only give a warning message if driver actually claims to have tuner
922 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
923 (_("Failed to set input %d on device %s."),
924 input, v4l2object->videodev), GST_ERROR_SYSTEM);
930 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
934 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
936 if (!GST_V4L2_IS_OPEN (v4l2object))
939 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
944 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
950 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
951 /* only give a warning message if driver actually claims to have tuner
954 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
955 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
961 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
963 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
965 if (!GST_V4L2_IS_OPEN (v4l2object))
968 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
975 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
976 /* only give a warning message if driver actually claims to have tuner
979 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
980 (_("Failed to set output %d on device %s."),
981 output, v4l2object->videodev), GST_ERROR_SYSTEM);