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"
50 #include "gstv4l2videodec.h"
52 #include "gst/gst-i18n-plugin.h"
54 GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
55 #define GST_CAT_DEFAULT v4l2_debug
57 /******************************************************
58 * gst_v4l2_get_capabilities():
59 * get the device's capturing capabilities
60 * return value: TRUE on success, FALSE on error
61 ******************************************************/
63 gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
67 e = v4l2object->element;
69 GST_DEBUG_OBJECT (e, "getting capabilities");
71 if (!GST_V4L2_IS_OPEN (v4l2object))
74 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
77 GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver);
78 GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card);
79 GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info);
80 GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version);
81 GST_LOG_OBJECT (e, "capabilites: %08x", v4l2object->vcap.capabilities);
88 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
89 (_("Error getting capabilities for device '%s': "
90 "It isn't a v4l2 driver. Check if it is a v4l1 driver."),
91 v4l2object->videodev), GST_ERROR_SYSTEM);
96 /******************************************************
97 * The video4linux command line tool v4l2-ctrl
98 * normalises the names of the controls received from
101 * "Exposure (absolute)" -> "exposure_absolute"
103 * We follow their lead here. @name is modified
105 ******************************************************/
107 gst_v4l2_normalise_control_name (gchar * name)
110 for (i = 0, j = 0; name[j]; ++j) {
111 if (g_ascii_isalnum (name[j])) {
112 if (i > 0 && !g_ascii_isalnum (name[j - 1]))
114 name[i++] = g_ascii_tolower (name[j]);
120 /******************************************************
121 * gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
122 * fill/empty the lists of enumerations
123 * return value: TRUE on success, FALSE on error
124 ******************************************************/
126 gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
129 struct v4l2_queryctrl control = { 0, };
133 e = v4l2object->element;
135 GST_DEBUG_OBJECT (e, "getting enumerations");
136 GST_V4L2_CHECK_OPEN (v4l2object);
138 GST_DEBUG_OBJECT (e, " channels");
139 /* and now, the channels */
141 struct v4l2_input input;
142 GstV4l2TunerChannel *v4l2channel;
143 GstTunerChannel *channel;
145 memset (&input, 0, sizeof (input));
148 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
149 if (errno == EINVAL || errno == ENOTTY)
150 break; /* end of enumeration */
152 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
153 (_("Failed to query attributes of input %d in device %s"),
154 n, v4l2object->videodev),
155 ("Failed to get %d in input enumeration for %s. (%d - %s)",
156 n, v4l2object->videodev, errno, strerror (errno)));
161 GST_LOG_OBJECT (e, " index: %d", input.index);
162 GST_LOG_OBJECT (e, " name: '%s'", input.name);
163 GST_LOG_OBJECT (e, " type: %08x", input.type);
164 GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
165 GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
166 (guint64) input.std);
167 GST_LOG_OBJECT (e, " status: %08x", input.status);
169 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
170 channel = GST_TUNER_CHANNEL (v4l2channel);
171 channel->label = g_strdup ((const gchar *) input.name);
172 channel->flags = GST_TUNER_CHANNEL_INPUT;
173 v4l2channel->index = n;
175 if (input.type == V4L2_INPUT_TYPE_TUNER) {
176 struct v4l2_tuner vtun;
178 v4l2channel->tuner = input.tuner;
179 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
181 vtun.index = input.tuner;
182 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
183 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
184 (_("Failed to get setting of tuner %d on device '%s'."),
185 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
186 g_object_unref (G_OBJECT (channel));
190 channel->freq_multiplicator =
191 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
192 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
193 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
194 channel->min_signal = 0;
195 channel->max_signal = 0xffff;
197 if (input.audioset) {
198 /* we take the first. We don't care for
199 * the others for now */
200 while (!(input.audioset & (1 << v4l2channel->audio)))
201 v4l2channel->audio++;
202 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
205 v4l2object->channels =
206 g_list_prepend (v4l2object->channels, (gpointer) channel);
208 v4l2object->channels = g_list_reverse (v4l2object->channels);
210 GST_DEBUG_OBJECT (e, " norms");
213 struct v4l2_standard standard = { 0, };
214 GstV4l2TunerNorm *v4l2norm;
218 /* fill in defaults */
219 standard.frameperiod.numerator = 1;
220 standard.frameperiod.denominator = 0;
223 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
224 if (errno == EINVAL || errno == ENOTTY)
225 break; /* end of enumeration */
227 else if (errno == ENODATA)
228 break; /* end of enumeration, as of Linux 3.7-rc1 */
231 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
232 (_("Failed to query norm on device '%s'."),
233 v4l2object->videodev),
234 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
235 n, v4l2object->videodev, errno, strerror (errno)));
240 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
241 standard.name, standard.frameperiod.denominator,
242 standard.frameperiod.numerator);
244 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
245 norm = GST_TUNER_NORM (v4l2norm);
246 norm->label = g_strdup ((const gchar *) standard.name);
247 gst_value_set_fraction (&norm->framerate,
248 standard.frameperiod.denominator, standard.frameperiod.numerator);
249 v4l2norm->index = standard.id;
251 GST_DEBUG_OBJECT (v4l2object->element, "index=%08x, label=%s",
252 (unsigned int) v4l2norm->index, norm->label);
254 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
256 v4l2object->norms = g_list_reverse (v4l2object->norms);
258 GST_DEBUG_OBJECT (e, " controls+menus");
260 /* and lastly, controls+menus (if appropriate) */
261 next = V4L2_CTRL_FLAG_NEXT_CTRL;
266 GstV4l2ColorBalanceChannel *v4l2channel;
267 GstColorBalanceChannel *channel;
273 /* when we reached the last official CID, continue with private CIDs */
274 if (n == V4L2_CID_LASTP1) {
275 GST_DEBUG_OBJECT (e, "checking private CIDs");
276 n = V4L2_CID_PRIVATE_BASE;
278 GST_DEBUG_OBJECT (e, "checking control %08x", n);
280 control.id = n | next;
281 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
284 GST_DEBUG_OBJECT (e, "controls finished");
287 GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
293 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
294 if (n < V4L2_CID_PRIVATE_BASE) {
295 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
296 /* continue so that we also check private controls */
297 n = V4L2_CID_PRIVATE_BASE - 1;
300 GST_DEBUG_OBJECT (e, "controls finished");
304 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
305 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
309 /* bogus driver might mess with id in unexpected ways (e.g. set to 0), so
310 * make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */
313 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
314 GST_DEBUG_OBJECT (e, "skipping disabled control");
318 if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
319 GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
323 switch (control.type) {
324 case V4L2_CTRL_TYPE_INTEGER:
325 case V4L2_CTRL_TYPE_BOOLEAN:
326 case V4L2_CTRL_TYPE_MENU:
327 case V4L2_CTRL_TYPE_INTEGER_MENU:
328 case V4L2_CTRL_TYPE_BITMASK:
329 case V4L2_CTRL_TYPE_BUTTON:{
330 control.name[31] = '\0';
331 gst_v4l2_normalise_control_name ((gchar *) control.name);
332 g_datalist_id_set_data (&v4l2object->controls,
333 g_quark_from_string ((const gchar *) control.name),
334 GINT_TO_POINTER (n));
339 "Control type for '%s' not suppored for extra controls.",
345 case V4L2_CID_BRIGHTNESS:
346 case V4L2_CID_CONTRAST:
347 case V4L2_CID_SATURATION:
349 case V4L2_CID_BLACK_LEVEL:
350 case V4L2_CID_AUTO_WHITE_BALANCE:
351 case V4L2_CID_DO_WHITE_BALANCE:
352 case V4L2_CID_RED_BALANCE:
353 case V4L2_CID_BLUE_BALANCE:
355 case V4L2_CID_EXPOSURE:
356 case V4L2_CID_AUTOGAIN:
358 case V4L2_CID_SHARPNESS:
359 /* we only handle these for now (why?) */
363 case V4L2_CID_PAN_RESET:
364 case V4L2_CID_TILT_RESET:
365 /* not handled here, handled by VideoOrientation interface */
368 case V4L2_CID_AUDIO_VOLUME:
369 case V4L2_CID_AUDIO_BALANCE:
370 case V4L2_CID_AUDIO_BASS:
371 case V4L2_CID_AUDIO_TREBLE:
372 case V4L2_CID_AUDIO_MUTE:
373 case V4L2_CID_AUDIO_LOUDNESS:
374 /* FIXME: We should implement GstMixer interface instead */
375 /* but let's not be pedantic and make element more useful for now */
377 case V4L2_CID_ALPHA_COMPONENT:
378 v4l2object->has_alpha_component = TRUE;
382 "ControlID %s (%x) unhandled, FIXME", control.name, n);
389 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
390 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
391 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
392 channel->label = g_strdup ((const gchar *) control.name);
396 /* FIXME: it will be need just when handling private controls
397 *(currently none of base controls are of this type) */
398 if (control.type == V4L2_CTRL_TYPE_MENU) {
399 struct v4l2_querymenu menu, *mptr;
406 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
408 break; /* end of enumeration */
410 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
411 (_("Failed getting controls attributes on device '%s'."),
412 v4l2object->videodev),
413 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
414 n, v4l2object->videodev, errno, strerror (errno)));
418 mptr = g_malloc (sizeof (menu));
419 memcpy (mptr, &menu, sizeof (menu));
420 menus = g_list_append (menus, mptr);
423 v4l2object->menus = g_list_append (v4l2object->menus, menus);
426 switch (control.type) {
427 case V4L2_CTRL_TYPE_INTEGER:
428 channel->min_value = control.minimum;
429 channel->max_value = control.maximum;
431 case V4L2_CTRL_TYPE_BOOLEAN:
432 channel->min_value = FALSE;
433 channel->max_value = TRUE;
436 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
437 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
438 unset (0), but can't be queried */
440 "Control with non supported type %s (%x), type=%d",
441 control.name, n, control.type);
442 channel->min_value = channel->max_value = 0;
447 g_list_prepend (v4l2object->colors, (gpointer) channel);
449 v4l2object->colors = g_list_reverse (v4l2object->colors);
451 GST_DEBUG_OBJECT (e, "done");
457 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
459 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
461 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
462 g_list_free (v4l2object->channels);
463 v4l2object->channels = NULL;
465 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
466 g_list_free (v4l2object->norms);
467 v4l2object->norms = NULL;
469 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
470 g_list_free (v4l2object->colors);
471 v4l2object->colors = NULL;
473 g_datalist_clear (&v4l2object->controls);
477 gst_v4l2_adjust_buf_type (GstV4l2Object * v4l2object)
479 /* when calling gst_v4l2_object_new the user decides the initial type
480 * so adjust it if multi-planar is supported
481 * the driver should make it exclusive. So the driver should
482 * not support both MPLANE and non-PLANE.
483 * Because even when using MPLANE it still possibles to use it
484 * in a contiguous manner. In this case the first v4l2 plane
485 * contains all the gst planes.
487 #define CHECK_CAPS (V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)
488 switch (v4l2object->type) {
489 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
490 if (v4l2object->vcap.capabilities & CHECK_CAPS) {
491 GST_DEBUG ("adjust type to multi-planar output");
492 v4l2object->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
495 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
496 if (v4l2object->vcap.capabilities & CHECK_CAPS) {
497 GST_DEBUG ("adjust type to multi-planar capture");
498 v4l2object->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
507 /******************************************************
509 * open the video device (v4l2object->videodev)
510 * return value: TRUE on success, FALSE on error
511 ******************************************************/
513 gst_v4l2_open (GstV4l2Object * v4l2object)
518 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
519 v4l2object->videodev);
521 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
522 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
524 /* be sure we have a device */
525 if (!v4l2object->videodev)
526 v4l2object->videodev = g_strdup ("/dev/video");
528 /* check if it is a device */
529 if (stat (v4l2object->videodev, &st) == -1)
532 if (!S_ISCHR (st.st_mode))
535 /* open the device */
536 v4l2object->video_fd =
537 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
539 if (!GST_V4L2_IS_OPEN (v4l2object))
542 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
543 V4L2_ENABLE_ENUM_FMT_EMULATION);
544 /* Note the v4l2_xxx functions are designed so that if they get passed an
545 unknown fd, the will behave exactly as their regular xxx counterparts, so
546 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
547 cam format to normal formats conversion). Chances are big we will still
548 fail then though, as normally v4l2_fd_open only fails if the device is not
550 if (libv4l2_fd != -1)
551 v4l2object->video_fd = libv4l2_fd;
553 /* get capabilities, error will be posted */
554 if (!gst_v4l2_get_capabilities (v4l2object))
557 /* do we need to be a capture device? */
558 if (GST_IS_V4L2SRC (v4l2object->element) &&
559 !(v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_CAPTURE |
560 V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
563 if (GST_IS_V4L2SINK (v4l2object->element) &&
564 !(v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_OUTPUT |
565 V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
568 if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
569 /* Today's M2M device only expose M2M */
570 !((v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_M2M |
571 V4L2_CAP_VIDEO_M2M_MPLANE)) ||
572 /* But legacy driver may expose both CAPTURE and OUTPUT */
573 ((v4l2object->vcap.capabilities &
574 (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
575 (v4l2object->vcap.capabilities &
576 (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
579 gst_v4l2_adjust_buf_type (v4l2object);
581 /* create enumerations, posts errors. */
582 if (!gst_v4l2_fill_lists (v4l2object))
585 GST_INFO_OBJECT (v4l2object->element,
586 "Opened device '%s' (%s) successfully",
587 v4l2object->vcap.card, v4l2object->videodev);
589 if (v4l2object->extra_controls)
590 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
592 /* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
593 * causes expensive and slow USB IO, so don't probe them for interlaced
595 if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb")) {
596 v4l2object->never_interlaced = TRUE;
604 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
605 (_("Cannot identify device '%s'."), v4l2object->videodev),
611 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
612 (_("This isn't a device '%s'."), v4l2object->videodev),
618 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
619 (_("Could not open device '%s' for reading and writing."),
620 v4l2object->videodev), GST_ERROR_SYSTEM);
625 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
626 (_("Device '%s' is not a capture device."),
627 v4l2object->videodev),
628 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
633 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
634 (_("Device '%s' is not a output device."),
635 v4l2object->videodev),
636 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
641 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
642 (_("Device '%s' is not a M2M device."),
643 v4l2object->videodev),
644 ("Capabilities: 0x%x", v4l2object->vcap.capabilities));
649 if (GST_V4L2_IS_OPEN (v4l2object)) {
651 v4l2_close (v4l2object->video_fd);
652 v4l2object->video_fd = -1;
655 gst_v4l2_empty_lists (v4l2object);
662 gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other)
664 GST_DEBUG_OBJECT (v4l2object->element, "Trying to dup device %s",
667 GST_V4L2_CHECK_OPEN (other);
668 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
669 GST_V4L2_CHECK_NOT_ACTIVE (other);
670 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
672 v4l2object->vcap = other->vcap;
673 gst_v4l2_adjust_buf_type (v4l2object);
675 v4l2object->video_fd = v4l2_dup (other->video_fd);
676 if (!GST_V4L2_IS_OPEN (v4l2object))
679 g_free (v4l2object->videodev);
680 v4l2object->videodev = g_strdup (other->videodev);
682 GST_INFO_OBJECT (v4l2object->element,
683 "Cloned device '%s' (%s) successfully",
684 v4l2object->vcap.card, v4l2object->videodev);
686 v4l2object->never_interlaced = other->never_interlaced;
692 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
693 (_("Could not dup device '%s' for reading and writing."),
694 v4l2object->videodev), GST_ERROR_SYSTEM);
701 /******************************************************
703 * close the video device (v4l2object->video_fd)
704 * return value: TRUE on success, FALSE on error
705 ******************************************************/
707 gst_v4l2_close (GstV4l2Object * v4l2object)
709 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
710 v4l2object->videodev);
712 GST_V4L2_CHECK_OPEN (v4l2object);
713 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
716 v4l2_close (v4l2object->video_fd);
717 v4l2object->video_fd = -1;
720 gst_v4l2_empty_lists (v4l2object);
726 /******************************************************
727 * gst_v4l2_get_norm()
728 * Get the norm of the current device
729 * return value: TRUE on success, FALSE on error
730 ******************************************************/
732 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
734 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
736 if (!GST_V4L2_IS_OPEN (v4l2object))
739 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
747 GST_DEBUG ("Failed to get the current norm for device %s",
748 v4l2object->videodev);
754 /******************************************************
755 * gst_v4l2_set_norm()
756 * Set the norm of the current device
757 * return value: TRUE on success, FALSE on error
758 ******************************************************/
760 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
762 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
763 "%" G_GINT64_MODIFIER "x", (guint64) norm);
765 if (!GST_V4L2_IS_OPEN (v4l2object))
768 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
776 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
777 (_("Failed to set norm for device '%s'."),
778 v4l2object->videodev), GST_ERROR_SYSTEM);
783 /******************************************************
784 * gst_v4l2_get_frequency():
785 * get the current frequency
786 * return value: TRUE on success, FALSE on error
787 ******************************************************/
789 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
790 gint tunernum, gulong * frequency)
792 struct v4l2_frequency freq = { 0, };
794 GstTunerChannel *channel;
796 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
798 if (!GST_V4L2_IS_OPEN (v4l2object))
801 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
803 freq.tuner = tunernum;
804 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
807 *frequency = freq.frequency * channel->freq_multiplicator;
814 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
815 (_("Failed to get current tuner frequency for device '%s'."),
816 v4l2object->videodev), GST_ERROR_SYSTEM);
822 /******************************************************
823 * gst_v4l2_set_frequency():
825 * return value: TRUE on success, FALSE on error
826 ******************************************************/
828 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
829 gint tunernum, gulong frequency)
831 struct v4l2_frequency freq = { 0, };
833 GstTunerChannel *channel;
835 GST_DEBUG_OBJECT (v4l2object->element,
836 "setting current tuner frequency to %lu", frequency);
838 if (!GST_V4L2_IS_OPEN (v4l2object))
841 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
843 freq.tuner = tunernum;
844 /* fill in type - ignore error */
845 (void) v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
846 freq.frequency = frequency / channel->freq_multiplicator;
848 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
856 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
857 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
858 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
863 /******************************************************
864 * gst_v4l2_signal_strength():
865 * get the strength of the signal on the current input
866 * return value: TRUE on success, FALSE on error
867 ******************************************************/
869 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
870 gint tunernum, gulong * signal_strength)
872 struct v4l2_tuner tuner = { 0, };
874 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
876 if (!GST_V4L2_IS_OPEN (v4l2object))
879 tuner.index = tunernum;
880 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
883 *signal_strength = tuner.signal;
890 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
891 (_("Failed to get signal strength for device '%s'."),
892 v4l2object->videodev), GST_ERROR_SYSTEM);
897 /******************************************************
898 * gst_v4l2_get_attribute():
899 * try to get the value of one specific attribute
900 * return value: TRUE on success, FALSE on error
901 ******************************************************/
903 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
904 int attribute_num, int *value)
906 struct v4l2_control control = { 0, };
908 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
911 if (!GST_V4L2_IS_OPEN (v4l2object))
914 control.id = attribute_num;
916 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
919 *value = control.value;
926 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
927 (_("Failed to get value for control %d on device '%s'."),
928 attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
934 /******************************************************
935 * gst_v4l2_set_attribute():
936 * try to set the value of one specific attribute
937 * return value: TRUE on success, FALSE on error
938 ******************************************************/
940 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
941 int attribute_num, const int value)
943 struct v4l2_control control = { 0, };
945 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
946 attribute_num, value);
948 if (!GST_V4L2_IS_OPEN (v4l2object))
951 control.id = attribute_num;
952 control.value = value;
953 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
961 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
962 (_("Failed to set value %d for control %d on device '%s'."),
963 value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
969 set_control (GQuark field_id, const GValue * value, gpointer user_data)
971 GstV4l2Object *v4l2object = user_data;
972 GQuark normalised_field_id;
975 /* 32 bytes is the maximum size for a control name according to v4l2 */
978 /* Backwards compatibility: in the past GStreamer would normalise strings in
979 a subtly different way to v4l2-ctl. e.g. the kernel's "Focus (absolute)"
980 would become "focus__absolute_" whereas now it becomes "focus_absolute".
981 Please remove the following in GStreamer 1.5 for 1.6 */
982 strncpy (name, g_quark_to_string (field_id), sizeof (name));
984 gst_v4l2_normalise_control_name (name);
985 normalised_field_id = g_quark_from_string (name);
986 if (normalised_field_id != field_id)
987 g_warning ("In GStreamer 1.4 the way V4L2 control names were normalised "
988 "changed. Instead of setting \"%s\" please use \"%s\". The former is "
989 "deprecated and will be removed in a future version of GStreamer",
990 g_quark_to_string (field_id), name);
991 field_id = normalised_field_id;
993 d = g_datalist_id_get_data (&v4l2object->controls, field_id);
995 GST_WARNING_OBJECT (v4l2object,
996 "Control '%s' does not exist or has an unsupported type.",
997 g_quark_to_string (field_id));
1000 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
1001 GST_WARNING_OBJECT (v4l2object,
1002 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
1005 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
1006 g_value_get_int (value));
1011 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
1013 return gst_structure_foreach (controls, set_control, v4l2object);
1017 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
1021 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
1023 if (!GST_V4L2_IS_OPEN (v4l2object))
1026 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
1031 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
1037 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
1038 /* only give a warning message if driver actually claims to have tuner
1041 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1042 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1048 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
1050 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
1052 if (!GST_V4L2_IS_OPEN (v4l2object))
1055 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
1062 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
1063 /* only give a warning message if driver actually claims to have tuner
1066 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1067 (_("Failed to set input %d on device %s."),
1068 input, v4l2object->videodev), GST_ERROR_SYSTEM);
1074 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
1078 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
1080 if (!GST_V4L2_IS_OPEN (v4l2object))
1083 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
1088 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
1094 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
1095 /* only give a warning message if driver actually claims to have tuner
1098 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1099 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1105 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
1107 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
1109 if (!GST_V4L2_IS_OPEN (v4l2object))
1112 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
1119 if (v4l2object->vcap.capabilities & V4L2_CAP_TUNER) {
1120 /* only give a warning message if driver actually claims to have tuner
1123 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1124 (_("Failed to set output %d on device %s."),
1125 output, v4l2object->videodev), GST_ERROR_SYSTEM);