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 #ifdef V4L2_CTRL_TYPE_INTEGER_MENU
278 case V4L2_CTRL_TYPE_INTEGER_MENU:
280 #ifdef V4L2_CTRL_TYPE_BITMASK
281 case V4L2_CTRL_TYPE_BITMASK:
283 case V4L2_CTRL_TYPE_BUTTON:{
285 control.name[31] = '\0';
286 for (i = 0; control.name[i]; ++i) {
287 control.name[i] = g_ascii_tolower (control.name[i]);
288 if (!g_ascii_isalnum (control.name[i]))
289 control.name[i] = '_';
291 GST_INFO_OBJECT (e, "adding generic controls '%s'", control.name);
292 g_datalist_id_set_data (&v4l2object->controls,
293 g_quark_from_string ((const gchar *) control.name),
294 GINT_TO_POINTER (n));
299 "Control type for '%s' not suppored for extra controls.",
305 case V4L2_CID_BRIGHTNESS:
306 case V4L2_CID_CONTRAST:
307 case V4L2_CID_SATURATION:
309 case V4L2_CID_BLACK_LEVEL:
310 case V4L2_CID_AUTO_WHITE_BALANCE:
311 case V4L2_CID_DO_WHITE_BALANCE:
312 case V4L2_CID_RED_BALANCE:
313 case V4L2_CID_BLUE_BALANCE:
315 case V4L2_CID_EXPOSURE:
316 case V4L2_CID_AUTOGAIN:
318 #ifdef V4L2_CID_SHARPNESS
319 case V4L2_CID_SHARPNESS:
321 /* we only handle these for now (why?) */
325 #ifndef V4L2_CID_PAN_RESET
326 case V4L2_CID_HCENTER:
328 #ifndef V4L2_CID_TILT_RESET
329 case V4L2_CID_VCENTER:
331 #ifdef V4L2_CID_PAN_RESET
332 case V4L2_CID_PAN_RESET:
334 #ifdef V4L2_CID_TILT_RESET
335 case V4L2_CID_TILT_RESET:
337 /* not handled here, handled by VideoOrientation interface */
340 case V4L2_CID_AUDIO_VOLUME:
341 case V4L2_CID_AUDIO_BALANCE:
342 case V4L2_CID_AUDIO_BASS:
343 case V4L2_CID_AUDIO_TREBLE:
344 case V4L2_CID_AUDIO_MUTE:
345 case V4L2_CID_AUDIO_LOUDNESS:
346 /* FIXME: We should implement GstMixer interface */
350 "ControlID %s (%x) unhandled, FIXME", control.name, n);
357 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
358 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
359 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
360 channel->label = g_strdup ((const gchar *) control.name);
364 /* FIXME: it will be need just when handling private controls
365 *(currently none of base controls are of this type) */
366 if (control.type == V4L2_CTRL_TYPE_MENU) {
367 struct v4l2_querymenu menu, *mptr;
374 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
376 break; /* end of enumeration */
378 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
379 (_("Failed getting controls attributes on device '%s'."),
380 v4l2object->videodev),
381 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
382 n, v4l2object->videodev, errno, strerror (errno)));
386 mptr = g_malloc (sizeof (menu));
387 memcpy (mptr, &menu, sizeof (menu));
388 menus = g_list_append (menus, mptr);
391 v4l2object->menus = g_list_append (v4l2object->menus, menus);
394 switch (control.type) {
395 case V4L2_CTRL_TYPE_INTEGER:
396 channel->min_value = control.minimum;
397 channel->max_value = control.maximum;
399 case V4L2_CTRL_TYPE_BOOLEAN:
400 channel->min_value = FALSE;
401 channel->max_value = TRUE;
404 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
405 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
406 unset (0), but can't be queried */
408 "Control with non supported type %s (%x), type=%d",
409 control.name, n, control.type);
410 channel->min_value = channel->max_value = 0;
415 g_list_prepend (v4l2object->colors, (gpointer) channel);
417 v4l2object->colors = g_list_reverse (v4l2object->colors);
419 GST_DEBUG_OBJECT (e, "done");
425 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
427 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
429 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
430 g_list_free (v4l2object->channels);
431 v4l2object->channels = NULL;
433 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
434 g_list_free (v4l2object->norms);
435 v4l2object->norms = NULL;
437 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
438 g_list_free (v4l2object->colors);
439 v4l2object->colors = NULL;
441 g_datalist_clear (&v4l2object->controls);
444 /******************************************************
446 * open the video device (v4l2object->videodev)
447 * return value: TRUE on success, FALSE on error
448 ******************************************************/
450 gst_v4l2_open (GstV4l2Object * v4l2object)
454 GstPollFD pollfd = GST_POLL_FD_INIT;
456 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
457 v4l2object->videodev);
459 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
460 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
462 /* be sure we have a device */
463 if (!v4l2object->videodev)
464 v4l2object->videodev = g_strdup ("/dev/video");
466 /* check if it is a device */
467 if (stat (v4l2object->videodev, &st) == -1)
470 if (!S_ISCHR (st.st_mode))
473 /* open the device */
474 v4l2object->video_fd =
475 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
477 if (!GST_V4L2_IS_OPEN (v4l2object))
480 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
481 V4L2_ENABLE_ENUM_FMT_EMULATION);
482 /* Note the v4l2_xxx functions are designed so that if they get passed an
483 unknown fd, the will behave exactly as their regular xxx counterparts, so
484 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
485 cam format to normal formats conversion). Chances are big we will still
486 fail then though, as normally v4l2_fd_open only fails if the device is not
488 if (libv4l2_fd != -1)
489 v4l2object->video_fd = libv4l2_fd;
491 v4l2object->can_poll_device = TRUE;
493 /* get capabilities, error will be posted */
494 if (!gst_v4l2_get_capabilities (v4l2object))
497 /* do we need to be a capture device? */
498 if (GST_IS_V4L2SRC (v4l2object->element) &&
499 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
502 if (GST_IS_V4L2SINK (v4l2object->element) &&
503 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
506 /* create enumerations, posts errors. */
507 if (!gst_v4l2_fill_lists (v4l2object))
510 GST_INFO_OBJECT (v4l2object->element,
511 "Opened device '%s' (%s) successfully",
512 v4l2object->vcap.card, v4l2object->videodev);
514 pollfd.fd = v4l2object->video_fd;
515 gst_poll_add_fd (v4l2object->poll, &pollfd);
516 if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
517 gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
519 gst_poll_fd_ctl_write (v4l2object->poll, &pollfd, TRUE);
521 if (v4l2object->extra_controls)
522 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
529 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
530 (_("Cannot identify device '%s'."), v4l2object->videodev),
536 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
537 (_("This isn't a device '%s'."), v4l2object->videodev),
543 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
544 (_("Could not open device '%s' for reading and writing."),
545 v4l2object->videodev), GST_ERROR_SYSTEM);
550 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
551 (_("Device '%s' is not a capture device."),
552 v4l2object->videodev),
553 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
558 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
559 (_("Device '%s' is not a output device."),
560 v4l2object->videodev),
561 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
566 if (GST_V4L2_IS_OPEN (v4l2object)) {
568 v4l2_close (v4l2object->video_fd);
569 v4l2object->video_fd = -1;
572 gst_v4l2_empty_lists (v4l2object);
579 /******************************************************
581 * close the video device (v4l2object->video_fd)
582 * return value: TRUE on success, FALSE on error
583 ******************************************************/
585 gst_v4l2_close (GstV4l2Object * v4l2object)
587 GstPollFD pollfd = GST_POLL_FD_INIT;
588 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
589 v4l2object->videodev);
591 GST_V4L2_CHECK_OPEN (v4l2object);
592 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
595 v4l2_close (v4l2object->video_fd);
596 pollfd.fd = v4l2object->video_fd;
597 gst_poll_remove_fd (v4l2object->poll, &pollfd);
598 v4l2object->video_fd = -1;
601 gst_v4l2_empty_lists (v4l2object);
607 /******************************************************
608 * gst_v4l2_get_norm()
609 * Get the norm of the current device
610 * return value: TRUE on success, FALSE on error
611 ******************************************************/
613 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
615 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
617 if (!GST_V4L2_IS_OPEN (v4l2object))
620 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
628 GST_DEBUG ("Failed to get the current norm for device %s",
629 v4l2object->videodev);
635 /******************************************************
636 * gst_v4l2_set_norm()
637 * Set the norm of the current device
638 * return value: TRUE on success, FALSE on error
639 ******************************************************/
641 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
643 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
644 "%" G_GINT64_MODIFIER "x", (guint64) norm);
646 if (!GST_V4L2_IS_OPEN (v4l2object))
649 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
657 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
658 (_("Failed to set norm for device '%s'."),
659 v4l2object->videodev), GST_ERROR_SYSTEM);
664 /******************************************************
665 * gst_v4l2_get_frequency():
666 * get the current frequency
667 * return value: TRUE on success, FALSE on error
668 ******************************************************/
670 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
671 gint tunernum, gulong * frequency)
673 struct v4l2_frequency freq = { 0, };
675 GstTunerChannel *channel;
677 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
679 if (!GST_V4L2_IS_OPEN (v4l2object))
682 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
684 freq.tuner = tunernum;
685 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
688 *frequency = freq.frequency * channel->freq_multiplicator;
695 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
696 (_("Failed to get current tuner frequency for device '%s'."),
697 v4l2object->videodev), GST_ERROR_SYSTEM);
703 /******************************************************
704 * gst_v4l2_set_frequency():
706 * return value: TRUE on success, FALSE on error
707 ******************************************************/
709 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
710 gint tunernum, gulong frequency)
712 struct v4l2_frequency freq = { 0, };
714 GstTunerChannel *channel;
716 GST_DEBUG_OBJECT (v4l2object->element,
717 "setting current tuner frequency to %lu", frequency);
719 if (!GST_V4L2_IS_OPEN (v4l2object))
722 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
724 freq.tuner = tunernum;
725 /* fill in type - ignore error */
726 v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
727 freq.frequency = frequency / channel->freq_multiplicator;
729 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
737 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
738 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
739 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
744 /******************************************************
745 * gst_v4l2_signal_strength():
746 * get the strength of the signal on the current input
747 * return value: TRUE on success, FALSE on error
748 ******************************************************/
750 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
751 gint tunernum, gulong * signal_strength)
753 struct v4l2_tuner tuner = { 0, };
755 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
757 if (!GST_V4L2_IS_OPEN (v4l2object))
760 tuner.index = tunernum;
761 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
764 *signal_strength = tuner.signal;
771 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
772 (_("Failed to get signal strength for device '%s'."),
773 v4l2object->videodev), GST_ERROR_SYSTEM);
778 /******************************************************
779 * gst_v4l2_get_attribute():
780 * try to get the value of one specific attribute
781 * return value: TRUE on success, FALSE on error
782 ******************************************************/
784 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
785 int attribute_num, int *value)
787 struct v4l2_control control = { 0, };
789 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
792 if (!GST_V4L2_IS_OPEN (v4l2object))
795 control.id = attribute_num;
797 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
800 *value = control.value;
807 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
808 (_("Failed to get value for control %d on device '%s'."),
809 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
815 /******************************************************
816 * gst_v4l2_set_attribute():
817 * try to set the value of one specific attribute
818 * return value: TRUE on success, FALSE on error
819 ******************************************************/
821 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
822 int attribute_num, const int value)
824 struct v4l2_control control = { 0, };
826 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
827 attribute_num, value);
829 if (!GST_V4L2_IS_OPEN (v4l2object))
832 control.id = attribute_num;
833 control.value = value;
834 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
842 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
843 (_("Failed to set value %d for control %d on device '%s'."),
844 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
850 set_contol (GQuark field_id, const GValue * value, gpointer user_data)
852 GstV4l2Object *v4l2object = user_data;
853 gpointer *d = g_datalist_id_get_data (&v4l2object->controls, field_id);
855 GST_WARNING_OBJECT (v4l2object,
856 "Control '%s' does not exist or has an unsupported type.",
857 g_quark_to_string (field_id));
860 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
861 GST_WARNING_OBJECT (v4l2object,
862 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
865 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
866 g_value_get_int (value));
871 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
873 return gst_structure_foreach (controls, set_contol, v4l2object);
877 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
881 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
883 if (!GST_V4L2_IS_OPEN (v4l2object))
886 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
891 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
897 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
898 /* only give a warning message if driver actually claims to have tuner
901 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
902 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
908 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
910 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
912 if (!GST_V4L2_IS_OPEN (v4l2object))
915 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
922 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
923 /* only give a warning message if driver actually claims to have tuner
926 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
927 (_("Failed to set input %d on device %s."),
928 input, v4l2object->videodev), GST_ERROR_SYSTEM);
934 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
938 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
940 if (!GST_V4L2_IS_OPEN (v4l2object))
943 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
948 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
954 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
955 /* only give a warning message if driver actually claims to have tuner
958 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
959 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
965 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
967 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
969 if (!GST_V4L2_IS_OPEN (v4l2object))
972 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
979 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
980 /* only give a warning message if driver actually claims to have tuner
983 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
984 (_("Failed to set output %d on device %s."),
985 output, v4l2object->videodev), GST_ERROR_SYSTEM);