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)
113 struct v4l2_queryctrl control = { 0, };
117 e = v4l2object->element;
119 GST_DEBUG_OBJECT (e, "getting enumerations");
120 GST_V4L2_CHECK_OPEN (v4l2object);
122 GST_DEBUG_OBJECT (e, " channels");
123 /* and now, the channels */
125 struct v4l2_input input;
126 GstV4l2TunerChannel *v4l2channel;
127 GstTunerChannel *channel;
129 memset (&input, 0, sizeof (input));
132 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
133 if (errno == EINVAL || errno == ENOTTY)
134 break; /* end of enumeration */
136 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
137 (_("Failed to query attributes of input %d in device %s"),
138 n, v4l2object->videodev),
139 ("Failed to get %d in input enumeration for %s. (%d - %s)",
140 n, v4l2object->videodev, errno, strerror (errno)));
145 GST_LOG_OBJECT (e, " index: %d", input.index);
146 GST_LOG_OBJECT (e, " name: '%s'", input.name);
147 GST_LOG_OBJECT (e, " type: %08x", input.type);
148 GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
149 GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
150 (guint64) input.std);
151 GST_LOG_OBJECT (e, " status: %08x", input.status);
153 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
154 channel = GST_TUNER_CHANNEL (v4l2channel);
155 channel->label = g_strdup ((const gchar *) input.name);
156 channel->flags = GST_TUNER_CHANNEL_INPUT;
157 v4l2channel->index = n;
159 if (input.type == V4L2_INPUT_TYPE_TUNER) {
160 struct v4l2_tuner vtun;
162 v4l2channel->tuner = input.tuner;
163 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
165 vtun.index = input.tuner;
166 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
167 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
168 (_("Failed to get setting of tuner %d on device '%s'."),
169 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
170 g_object_unref (G_OBJECT (channel));
174 channel->freq_multiplicator =
175 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
176 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
177 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
178 channel->min_signal = 0;
179 channel->max_signal = 0xffff;
181 if (input.audioset) {
182 /* we take the first. We don't care for
183 * the others for now */
184 while (!(input.audioset & (1 << v4l2channel->audio)))
185 v4l2channel->audio++;
186 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
189 v4l2object->channels =
190 g_list_prepend (v4l2object->channels, (gpointer) channel);
192 v4l2object->channels = g_list_reverse (v4l2object->channels);
194 GST_DEBUG_OBJECT (e, " norms");
197 struct v4l2_standard standard = { 0, };
198 GstV4l2TunerNorm *v4l2norm;
202 /* fill in defaults */
203 standard.frameperiod.numerator = 1;
204 standard.frameperiod.denominator = 0;
207 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
208 if (errno == EINVAL || errno == ENOTTY || errno == ENODATA)
209 break; /* end of enumeration */
211 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
212 (_("Failed to query norm on device '%s'."),
213 v4l2object->videodev),
214 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
215 n, v4l2object->videodev, errno, strerror (errno)));
220 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
221 standard.name, standard.frameperiod.denominator,
222 standard.frameperiod.numerator);
224 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
225 norm = GST_TUNER_NORM (v4l2norm);
226 norm->label = g_strdup ((const gchar *) standard.name);
227 gst_value_set_fraction (&norm->framerate,
228 standard.frameperiod.denominator, standard.frameperiod.numerator);
229 v4l2norm->index = standard.id;
231 GST_DEBUG_OBJECT (v4l2object->element, "index=%08x, label=%s",
232 (unsigned int) v4l2norm->index, norm->label);
234 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
236 v4l2object->norms = g_list_reverse (v4l2object->norms);
238 GST_DEBUG_OBJECT (e, " controls+menus");
240 /* and lastly, controls+menus (if appropriate) */
241 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
242 next = V4L2_CTRL_FLAG_NEXT_CTRL;
250 GstV4l2ColorBalanceChannel *v4l2channel;
251 GstColorBalanceChannel *channel;
256 /* when we reached the last official CID, continue with private CIDs */
257 if (n == V4L2_CID_LASTP1) {
258 GST_DEBUG_OBJECT (e, "checking private CIDs");
259 n = V4L2_CID_PRIVATE_BASE;
261 GST_DEBUG_OBJECT (e, "checking control %08x", n);
263 control.id = n | next;
264 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
267 GST_DEBUG_OBJECT (e, "controls finished");
270 GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
276 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
277 if (n < V4L2_CID_PRIVATE_BASE) {
278 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
279 /* continue so that we also check private controls */
282 GST_DEBUG_OBJECT (e, "controls finished");
286 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
287 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
292 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
293 GST_DEBUG_OBJECT (e, "skipping disabled control");
296 #ifdef V4L2_CTRL_TYPE_CTRL_CLASS
297 if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
298 GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
302 switch (control.type) {
303 case V4L2_CTRL_TYPE_INTEGER:
304 case V4L2_CTRL_TYPE_BOOLEAN:
305 case V4L2_CTRL_TYPE_MENU:
306 #ifdef V4L2_CTRL_TYPE_INTEGER_MENU
307 case V4L2_CTRL_TYPE_INTEGER_MENU:
309 #ifdef V4L2_CTRL_TYPE_BITMASK
310 case V4L2_CTRL_TYPE_BITMASK:
312 case V4L2_CTRL_TYPE_BUTTON:{
314 control.name[31] = '\0';
315 for (i = 0; control.name[i]; ++i) {
316 control.name[i] = g_ascii_tolower (control.name[i]);
317 if (!g_ascii_isalnum (control.name[i]))
318 control.name[i] = '_';
320 GST_INFO_OBJECT (e, "adding generic controls '%s'", control.name);
321 g_datalist_id_set_data (&v4l2object->controls,
322 g_quark_from_string ((const gchar *) control.name),
323 GINT_TO_POINTER (n));
328 "Control type for '%s' not suppored for extra controls.",
334 case V4L2_CID_BRIGHTNESS:
335 case V4L2_CID_CONTRAST:
336 case V4L2_CID_SATURATION:
338 case V4L2_CID_BLACK_LEVEL:
339 case V4L2_CID_AUTO_WHITE_BALANCE:
340 case V4L2_CID_DO_WHITE_BALANCE:
341 case V4L2_CID_RED_BALANCE:
342 case V4L2_CID_BLUE_BALANCE:
344 case V4L2_CID_EXPOSURE:
345 case V4L2_CID_AUTOGAIN:
347 #ifdef V4L2_CID_SHARPNESS
348 case V4L2_CID_SHARPNESS:
350 /* we only handle these for now (why?) */
354 #ifndef V4L2_CID_PAN_RESET
355 case V4L2_CID_HCENTER:
357 #ifndef V4L2_CID_TILT_RESET
358 case V4L2_CID_VCENTER:
360 #ifdef V4L2_CID_PAN_RESET
361 case V4L2_CID_PAN_RESET:
363 #ifdef V4L2_CID_TILT_RESET
364 case V4L2_CID_TILT_RESET:
366 /* not handled here, handled by VideoOrientation interface */
369 case V4L2_CID_AUDIO_VOLUME:
370 case V4L2_CID_AUDIO_BALANCE:
371 case V4L2_CID_AUDIO_BASS:
372 case V4L2_CID_AUDIO_TREBLE:
373 case V4L2_CID_AUDIO_MUTE:
374 case V4L2_CID_AUDIO_LOUDNESS:
375 /* FIXME: We should implement GstMixer interface */
379 "ControlID %s (%x) unhandled, FIXME", control.name, n);
386 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
387 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
388 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
389 channel->label = g_strdup ((const gchar *) control.name);
393 /* FIXME: it will be need just when handling private controls
394 *(currently none of base controls are of this type) */
395 if (control.type == V4L2_CTRL_TYPE_MENU) {
396 struct v4l2_querymenu menu, *mptr;
403 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
405 break; /* end of enumeration */
407 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
408 (_("Failed getting controls attributes on device '%s'."),
409 v4l2object->videodev),
410 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
411 n, v4l2object->videodev, errno, strerror (errno)));
415 mptr = g_malloc (sizeof (menu));
416 memcpy (mptr, &menu, sizeof (menu));
417 menus = g_list_append (menus, mptr);
420 v4l2object->menus = g_list_append (v4l2object->menus, menus);
423 switch (control.type) {
424 case V4L2_CTRL_TYPE_INTEGER:
425 channel->min_value = control.minimum;
426 channel->max_value = control.maximum;
428 case V4L2_CTRL_TYPE_BOOLEAN:
429 channel->min_value = FALSE;
430 channel->max_value = TRUE;
433 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
434 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
435 unset (0), but can't be queried */
437 "Control with non supported type %s (%x), type=%d",
438 control.name, n, control.type);
439 channel->min_value = channel->max_value = 0;
444 g_list_prepend (v4l2object->colors, (gpointer) channel);
446 v4l2object->colors = g_list_reverse (v4l2object->colors);
448 GST_DEBUG_OBJECT (e, "done");
454 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
456 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
458 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
459 g_list_free (v4l2object->channels);
460 v4l2object->channels = NULL;
462 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
463 g_list_free (v4l2object->norms);
464 v4l2object->norms = NULL;
466 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
467 g_list_free (v4l2object->colors);
468 v4l2object->colors = NULL;
470 g_datalist_clear (&v4l2object->controls);
473 /******************************************************
475 * open the video device (v4l2object->videodev)
476 * return value: TRUE on success, FALSE on error
477 ******************************************************/
479 gst_v4l2_open (GstV4l2Object * v4l2object)
483 GstPollFD pollfd = GST_POLL_FD_INIT;
485 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
486 v4l2object->videodev);
488 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
489 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
491 /* be sure we have a device */
492 if (!v4l2object->videodev)
493 v4l2object->videodev = g_strdup ("/dev/video");
495 /* check if it is a device */
496 if (stat (v4l2object->videodev, &st) == -1)
499 if (!S_ISCHR (st.st_mode))
502 /* open the device */
503 v4l2object->video_fd =
504 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
506 if (!GST_V4L2_IS_OPEN (v4l2object))
509 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
510 V4L2_ENABLE_ENUM_FMT_EMULATION);
511 /* Note the v4l2_xxx functions are designed so that if they get passed an
512 unknown fd, the will behave exactly as their regular xxx counterparts, so
513 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
514 cam format to normal formats conversion). Chances are big we will still
515 fail then though, as normally v4l2_fd_open only fails if the device is not
517 if (libv4l2_fd != -1)
518 v4l2object->video_fd = libv4l2_fd;
520 v4l2object->can_poll_device = TRUE;
522 /* get capabilities, error will be posted */
523 if (!gst_v4l2_get_capabilities (v4l2object))
526 /* do we need to be a capture device? */
527 if (GST_IS_V4L2SRC (v4l2object->element) &&
528 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
531 if (GST_IS_V4L2SINK (v4l2object->element) &&
532 !(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
535 /* create enumerations, posts errors. */
536 if (!gst_v4l2_fill_lists (v4l2object))
539 GST_INFO_OBJECT (v4l2object->element,
540 "Opened device '%s' (%s) successfully",
541 v4l2object->vcap.card, v4l2object->videodev);
543 pollfd.fd = v4l2object->video_fd;
544 gst_poll_add_fd (v4l2object->poll, &pollfd);
545 if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
546 gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
548 gst_poll_fd_ctl_write (v4l2object->poll, &pollfd, TRUE);
550 if (v4l2object->extra_controls)
551 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
558 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
559 (_("Cannot identify device '%s'."), v4l2object->videodev),
565 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
566 (_("This isn't a device '%s'."), v4l2object->videodev),
572 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
573 (_("Could not open device '%s' for reading and writing."),
574 v4l2object->videodev), GST_ERROR_SYSTEM);
579 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
580 (_("Device '%s' is not a capture device."),
581 v4l2object->videodev),
582 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
587 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
588 (_("Device '%s' is not a output device."),
589 v4l2object->videodev),
590 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
595 if (GST_V4L2_IS_OPEN (v4l2object)) {
597 v4l2_close (v4l2object->video_fd);
598 v4l2object->video_fd = -1;
601 gst_v4l2_empty_lists (v4l2object);
608 /******************************************************
610 * close the video device (v4l2object->video_fd)
611 * return value: TRUE on success, FALSE on error
612 ******************************************************/
614 gst_v4l2_close (GstV4l2Object * v4l2object)
616 GstPollFD pollfd = GST_POLL_FD_INIT;
617 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
618 v4l2object->videodev);
620 GST_V4L2_CHECK_OPEN (v4l2object);
621 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
624 v4l2_close (v4l2object->video_fd);
625 pollfd.fd = v4l2object->video_fd;
626 gst_poll_remove_fd (v4l2object->poll, &pollfd);
627 v4l2object->video_fd = -1;
630 gst_v4l2_empty_lists (v4l2object);
636 /******************************************************
637 * gst_v4l2_get_norm()
638 * Get the norm of the current device
639 * return value: TRUE on success, FALSE on error
640 ******************************************************/
642 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
644 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
646 if (!GST_V4L2_IS_OPEN (v4l2object))
649 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
657 GST_DEBUG ("Failed to get the current norm for device %s",
658 v4l2object->videodev);
664 /******************************************************
665 * gst_v4l2_set_norm()
666 * Set the norm of the current device
667 * return value: TRUE on success, FALSE on error
668 ******************************************************/
670 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
672 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
673 "%" G_GINT64_MODIFIER "x", (guint64) norm);
675 if (!GST_V4L2_IS_OPEN (v4l2object))
678 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
686 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
687 (_("Failed to set norm for device '%s'."),
688 v4l2object->videodev), GST_ERROR_SYSTEM);
693 /******************************************************
694 * gst_v4l2_get_frequency():
695 * get the current frequency
696 * return value: TRUE on success, FALSE on error
697 ******************************************************/
699 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
700 gint tunernum, gulong * frequency)
702 struct v4l2_frequency freq = { 0, };
704 GstTunerChannel *channel;
706 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
708 if (!GST_V4L2_IS_OPEN (v4l2object))
711 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
713 freq.tuner = tunernum;
714 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
717 *frequency = freq.frequency * channel->freq_multiplicator;
724 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
725 (_("Failed to get current tuner frequency for device '%s'."),
726 v4l2object->videodev), GST_ERROR_SYSTEM);
732 /******************************************************
733 * gst_v4l2_set_frequency():
735 * return value: TRUE on success, FALSE on error
736 ******************************************************/
738 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
739 gint tunernum, gulong frequency)
741 struct v4l2_frequency freq = { 0, };
743 GstTunerChannel *channel;
745 GST_DEBUG_OBJECT (v4l2object->element,
746 "setting current tuner frequency to %lu", frequency);
748 if (!GST_V4L2_IS_OPEN (v4l2object))
751 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
753 freq.tuner = tunernum;
754 /* fill in type - ignore error */
755 v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
756 freq.frequency = frequency / channel->freq_multiplicator;
758 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
766 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
767 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
768 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
773 /******************************************************
774 * gst_v4l2_signal_strength():
775 * get the strength of the signal on the current input
776 * return value: TRUE on success, FALSE on error
777 ******************************************************/
779 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
780 gint tunernum, gulong * signal_strength)
782 struct v4l2_tuner tuner = { 0, };
784 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
786 if (!GST_V4L2_IS_OPEN (v4l2object))
789 tuner.index = tunernum;
790 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
793 *signal_strength = tuner.signal;
800 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
801 (_("Failed to get signal strength for device '%s'."),
802 v4l2object->videodev), GST_ERROR_SYSTEM);
807 /******************************************************
808 * gst_v4l2_get_attribute():
809 * try to get the value of one specific attribute
810 * return value: TRUE on success, FALSE on error
811 ******************************************************/
813 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
814 int attribute_num, int *value)
816 struct v4l2_control control = { 0, };
818 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
821 if (!GST_V4L2_IS_OPEN (v4l2object))
824 control.id = attribute_num;
826 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
829 *value = control.value;
836 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
837 (_("Failed to get value for control %d on device '%s'."),
838 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
844 /******************************************************
845 * gst_v4l2_set_attribute():
846 * try to set the value of one specific attribute
847 * return value: TRUE on success, FALSE on error
848 ******************************************************/
850 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
851 int attribute_num, const int value)
853 struct v4l2_control control = { 0, };
855 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
856 attribute_num, value);
858 if (!GST_V4L2_IS_OPEN (v4l2object))
861 control.id = attribute_num;
862 control.value = value;
863 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
871 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
872 (_("Failed to set value %d for control %d on device '%s'."),
873 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
879 set_contol (GQuark field_id, const GValue * value, gpointer user_data)
881 GstV4l2Object *v4l2object = user_data;
882 gpointer *d = g_datalist_id_get_data (&v4l2object->controls, field_id);
884 GST_WARNING_OBJECT (v4l2object,
885 "Control '%s' does not exist or has an unsupported type.",
886 g_quark_to_string (field_id));
889 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
890 GST_WARNING_OBJECT (v4l2object,
891 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
894 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
895 g_value_get_int (value));
900 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
902 return gst_structure_foreach (controls, set_contol, v4l2object);
906 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
910 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
912 if (!GST_V4L2_IS_OPEN (v4l2object))
915 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
920 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
926 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
927 /* only give a warning message if driver actually claims to have tuner
930 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
931 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
937 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
939 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
941 if (!GST_V4L2_IS_OPEN (v4l2object))
944 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
951 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
952 /* only give a warning message if driver actually claims to have tuner
955 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
956 (_("Failed to set input %d on device %s."),
957 input, v4l2object->videodev), GST_ERROR_SYSTEM);
963 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
967 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
969 if (!GST_V4L2_IS_OPEN (v4l2object))
972 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
977 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
983 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
984 /* only give a warning message if driver actually claims to have tuner
987 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
988 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
994 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
996 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
998 if (!GST_V4L2_IS_OPEN (v4l2object))
1001 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
1008 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
1009 /* only give a warning message if driver actually claims to have tuner
1012 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1013 (_("Failed to set output %d on device %s."),
1014 output, v4l2object->videodev), GST_ERROR_SYSTEM);