3 * Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@gmail.com>
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 if (v4l2object->vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
78 v4l2object->device_caps = v4l2object->vcap.device_caps;
80 v4l2object->device_caps = v4l2object->vcap.capabilities;
82 GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver);
83 GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card);
84 GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info);
85 GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version);
86 GST_LOG_OBJECT (e, "capabilites: %08x", v4l2object->device_caps);
93 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
94 (_("Error getting capabilities for device '%s': "
95 "It isn't a v4l2 driver. Check if it is a v4l1 driver."),
96 v4l2object->videodev), GST_ERROR_SYSTEM);
101 /******************************************************
102 * The video4linux command line tool v4l2-ctrl
103 * normalises the names of the controls received from
106 * "Exposure (absolute)" -> "exposure_absolute"
108 * We follow their lead here. @name is modified
110 ******************************************************/
112 gst_v4l2_normalise_control_name (gchar * name)
115 for (i = 0, j = 0; name[j]; ++j) {
116 if (g_ascii_isalnum (name[j])) {
117 if (i > 0 && !g_ascii_isalnum (name[j - 1]))
119 name[i++] = g_ascii_tolower (name[j]);
125 /******************************************************
126 * gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
127 * fill/empty the lists of enumerations
128 * return value: TRUE on success, FALSE on error
129 ******************************************************/
131 gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
134 struct v4l2_queryctrl control = { 0, };
138 e = v4l2object->element;
140 GST_DEBUG_OBJECT (e, "getting enumerations");
141 GST_V4L2_CHECK_OPEN (v4l2object);
143 GST_DEBUG_OBJECT (e, " channels");
144 /* and now, the channels */
146 struct v4l2_input input;
147 GstV4l2TunerChannel *v4l2channel;
148 GstTunerChannel *channel;
150 memset (&input, 0, sizeof (input));
153 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
154 if (errno == EINVAL || errno == ENOTTY)
155 break; /* end of enumeration */
157 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
158 (_("Failed to query attributes of input %d in device %s"),
159 n, v4l2object->videodev),
160 ("Failed to get %d in input enumeration for %s. (%d - %s)",
161 n, v4l2object->videodev, errno, strerror (errno)));
166 GST_LOG_OBJECT (e, " index: %d", input.index);
167 GST_LOG_OBJECT (e, " name: '%s'", input.name);
168 GST_LOG_OBJECT (e, " type: %08x", input.type);
169 GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
170 GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
171 (guint64) input.std);
172 GST_LOG_OBJECT (e, " status: %08x", input.status);
174 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
175 channel = GST_TUNER_CHANNEL (v4l2channel);
176 channel->label = g_strdup ((const gchar *) input.name);
177 channel->flags = GST_TUNER_CHANNEL_INPUT;
178 v4l2channel->index = n;
180 if (input.type == V4L2_INPUT_TYPE_TUNER) {
181 struct v4l2_tuner vtun;
183 v4l2channel->tuner = input.tuner;
184 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
186 vtun.index = input.tuner;
187 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
188 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
189 (_("Failed to get setting of tuner %d on device '%s'."),
190 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
191 g_object_unref (G_OBJECT (channel));
195 channel->freq_multiplicator =
196 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
197 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
198 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
199 channel->min_signal = 0;
200 channel->max_signal = 0xffff;
202 if (input.audioset) {
203 /* we take the first. We don't care for
204 * the others for now */
205 while (!(input.audioset & (1 << v4l2channel->audio)))
206 v4l2channel->audio++;
207 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
210 v4l2object->channels =
211 g_list_prepend (v4l2object->channels, (gpointer) channel);
213 v4l2object->channels = g_list_reverse (v4l2object->channels);
215 GST_DEBUG_OBJECT (e, " norms");
218 struct v4l2_standard standard = { 0, };
219 GstV4l2TunerNorm *v4l2norm;
223 /* fill in defaults */
224 standard.frameperiod.numerator = 1;
225 standard.frameperiod.denominator = 0;
228 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
229 if (errno == EINVAL || errno == ENOTTY)
230 break; /* end of enumeration */
232 else if (errno == ENODATA)
233 break; /* end of enumeration, as of Linux 3.7-rc1 */
236 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
237 (_("Failed to query norm on device '%s'."),
238 v4l2object->videodev),
239 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
240 n, v4l2object->videodev, errno, strerror (errno)));
245 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
246 standard.name, standard.frameperiod.denominator,
247 standard.frameperiod.numerator);
249 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
250 norm = GST_TUNER_NORM (v4l2norm);
251 norm->label = g_strdup ((const gchar *) standard.name);
252 gst_value_set_fraction (&norm->framerate,
253 standard.frameperiod.denominator, standard.frameperiod.numerator);
254 v4l2norm->index = standard.id;
256 GST_DEBUG_OBJECT (v4l2object->element, "index=%08x, label=%s",
257 (unsigned int) v4l2norm->index, norm->label);
259 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
261 v4l2object->norms = g_list_reverse (v4l2object->norms);
263 GST_DEBUG_OBJECT (e, " controls+menus");
265 /* and lastly, controls+menus (if appropriate) */
266 next = V4L2_CTRL_FLAG_NEXT_CTRL;
271 GstV4l2ColorBalanceChannel *v4l2channel;
272 GstColorBalanceChannel *channel;
278 /* when we reached the last official CID, continue with private CIDs */
279 if (n == V4L2_CID_LASTP1) {
280 GST_DEBUG_OBJECT (e, "checking private CIDs");
281 n = V4L2_CID_PRIVATE_BASE;
283 GST_DEBUG_OBJECT (e, "checking control %08x", n);
285 control.id = n | next;
286 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
289 GST_DEBUG_OBJECT (e, "controls finished");
292 GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
298 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
299 if (n < V4L2_CID_PRIVATE_BASE) {
300 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
301 /* continue so that we also check private controls */
302 n = V4L2_CID_PRIVATE_BASE - 1;
305 GST_DEBUG_OBJECT (e, "controls finished");
309 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
310 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
314 /* bogus driver might mess with id in unexpected ways (e.g. set to 0), so
315 * make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */
318 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
319 GST_DEBUG_OBJECT (e, "skipping disabled control");
323 if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
324 GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
328 switch (control.type) {
329 case V4L2_CTRL_TYPE_INTEGER:
330 case V4L2_CTRL_TYPE_BOOLEAN:
331 case V4L2_CTRL_TYPE_MENU:
332 case V4L2_CTRL_TYPE_INTEGER_MENU:
333 case V4L2_CTRL_TYPE_BITMASK:
334 case V4L2_CTRL_TYPE_BUTTON:{
335 control.name[31] = '\0';
336 gst_v4l2_normalise_control_name ((gchar *) control.name);
337 g_datalist_id_set_data (&v4l2object->controls,
338 g_quark_from_string ((const gchar *) control.name),
339 GINT_TO_POINTER (n));
344 "Control type for '%s' not suppored for extra controls.",
350 case V4L2_CID_BRIGHTNESS:
351 case V4L2_CID_CONTRAST:
352 case V4L2_CID_SATURATION:
354 case V4L2_CID_BLACK_LEVEL:
355 case V4L2_CID_AUTO_WHITE_BALANCE:
356 case V4L2_CID_DO_WHITE_BALANCE:
357 case V4L2_CID_RED_BALANCE:
358 case V4L2_CID_BLUE_BALANCE:
360 case V4L2_CID_EXPOSURE:
361 case V4L2_CID_AUTOGAIN:
363 case V4L2_CID_SHARPNESS:
364 /* we only handle these for now (why?) */
368 case V4L2_CID_PAN_RESET:
369 case V4L2_CID_TILT_RESET:
370 /* not handled here, handled by VideoOrientation interface */
373 case V4L2_CID_AUDIO_VOLUME:
374 case V4L2_CID_AUDIO_BALANCE:
375 case V4L2_CID_AUDIO_BASS:
376 case V4L2_CID_AUDIO_TREBLE:
377 case V4L2_CID_AUDIO_MUTE:
378 case V4L2_CID_AUDIO_LOUDNESS:
379 /* FIXME: We should implement GstMixer interface instead */
380 /* but let's not be pedantic and make element more useful for now */
382 case V4L2_CID_ALPHA_COMPONENT:
383 v4l2object->has_alpha_component = TRUE;
387 "ControlID %s (%x) unhandled, FIXME", control.name, n);
394 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
395 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
396 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
397 channel->label = g_strdup ((const gchar *) control.name);
401 /* FIXME: it will be need just when handling private controls
402 *(currently none of base controls are of this type) */
403 if (control.type == V4L2_CTRL_TYPE_MENU) {
404 struct v4l2_querymenu menu, *mptr;
411 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
413 break; /* end of enumeration */
415 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
416 (_("Failed getting controls attributes on device '%s'."),
417 v4l2object->videodev),
418 ("Failed to get %d in menu enumeration for %s. (%d - %s)",
419 n, v4l2object->videodev, errno, strerror (errno)));
423 mptr = g_malloc (sizeof (menu));
424 memcpy (mptr, &menu, sizeof (menu));
425 menus = g_list_append (menus, mptr);
428 v4l2object->menus = g_list_append (v4l2object->menus, menus);
431 switch (control.type) {
432 case V4L2_CTRL_TYPE_INTEGER:
433 channel->min_value = control.minimum;
434 channel->max_value = control.maximum;
436 case V4L2_CTRL_TYPE_BOOLEAN:
437 channel->min_value = FALSE;
438 channel->max_value = TRUE;
441 /* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
442 BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
443 unset (0), but can't be queried */
445 "Control with non supported type %s (%x), type=%d",
446 control.name, n, control.type);
447 channel->min_value = channel->max_value = 0;
452 g_list_prepend (v4l2object->colors, (gpointer) channel);
454 v4l2object->colors = g_list_reverse (v4l2object->colors);
456 GST_DEBUG_OBJECT (e, "done");
462 gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
464 GST_DEBUG_OBJECT (v4l2object->element, "deleting enumerations");
466 g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
467 g_list_free (v4l2object->channels);
468 v4l2object->channels = NULL;
470 g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
471 g_list_free (v4l2object->norms);
472 v4l2object->norms = NULL;
474 g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
475 g_list_free (v4l2object->colors);
476 v4l2object->colors = NULL;
478 g_datalist_clear (&v4l2object->controls);
482 gst_v4l2_adjust_buf_type (GstV4l2Object * v4l2object)
484 /* when calling gst_v4l2_object_new the user decides the initial type
485 * so adjust it if multi-planar is supported
486 * the driver should make it exclusive. So the driver should
487 * not support both MPLANE and non-PLANE.
488 * Because even when using MPLANE it still possibles to use it
489 * in a contiguous manner. In this case the first v4l2 plane
490 * contains all the gst planes.
492 switch (v4l2object->type) {
493 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
494 if (v4l2object->device_caps &
495 (V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) {
496 GST_DEBUG ("adjust type to multi-planar output");
497 v4l2object->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
500 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
501 if (v4l2object->device_caps &
502 (V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) {
503 GST_DEBUG ("adjust type to multi-planar capture");
504 v4l2object->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
512 /******************************************************
514 * open the video device (v4l2object->videodev)
515 * return value: TRUE on success, FALSE on error
516 ******************************************************/
518 gst_v4l2_open (GstV4l2Object * v4l2object)
523 GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
524 v4l2object->videodev);
526 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
527 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
529 /* be sure we have a device */
530 if (!v4l2object->videodev)
531 v4l2object->videodev = g_strdup ("/dev/video");
533 /* check if it is a device */
534 if (stat (v4l2object->videodev, &st) == -1)
537 if (!S_ISCHR (st.st_mode))
540 /* open the device */
541 v4l2object->video_fd =
542 open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
544 if (!GST_V4L2_IS_OPEN (v4l2object))
547 libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
548 V4L2_ENABLE_ENUM_FMT_EMULATION);
549 /* Note the v4l2_xxx functions are designed so that if they get passed an
550 unknown fd, the will behave exactly as their regular xxx counterparts, so
551 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
552 cam format to normal formats conversion). Chances are big we will still
553 fail then though, as normally v4l2_fd_open only fails if the device is not
555 if (libv4l2_fd != -1)
556 v4l2object->video_fd = libv4l2_fd;
558 /* get capabilities, error will be posted */
559 if (!gst_v4l2_get_capabilities (v4l2object))
562 /* do we need to be a capture device? */
563 if (GST_IS_V4L2SRC (v4l2object->element) &&
564 !(v4l2object->device_caps & (V4L2_CAP_VIDEO_CAPTURE |
565 V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
568 if (GST_IS_V4L2SINK (v4l2object->element) &&
569 !(v4l2object->device_caps & (V4L2_CAP_VIDEO_OUTPUT |
570 V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
573 if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
574 /* Today's M2M device only expose M2M */
575 !((v4l2object->device_caps & (V4L2_CAP_VIDEO_M2M |
576 V4L2_CAP_VIDEO_M2M_MPLANE)) ||
577 /* But legacy driver may expose both CAPTURE and OUTPUT */
578 ((v4l2object->device_caps &
579 (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
580 (v4l2object->device_caps &
581 (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
584 gst_v4l2_adjust_buf_type (v4l2object);
586 /* create enumerations, posts errors. */
587 if (!gst_v4l2_fill_lists (v4l2object))
590 GST_INFO_OBJECT (v4l2object->element,
591 "Opened device '%s' (%s) successfully",
592 v4l2object->vcap.card, v4l2object->videodev);
594 if (v4l2object->extra_controls)
595 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
597 /* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
598 * causes expensive and slow USB IO, so don't probe them for interlaced
600 if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb")) {
601 v4l2object->never_interlaced = TRUE;
609 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
610 (_("Cannot identify device '%s'."), v4l2object->videodev),
616 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
617 (_("This isn't a device '%s'."), v4l2object->videodev),
623 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
624 (_("Could not open device '%s' for reading and writing."),
625 v4l2object->videodev), GST_ERROR_SYSTEM);
630 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
631 (_("Device '%s' is not a capture device."),
632 v4l2object->videodev),
633 ("Capabilities: 0x%x", v4l2object->device_caps));
638 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
639 (_("Device '%s' is not a output device."),
640 v4l2object->videodev),
641 ("Capabilities: 0x%x", v4l2object->device_caps));
646 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
647 (_("Device '%s' is not a M2M device."),
648 v4l2object->videodev),
649 ("Capabilities: 0x%x", v4l2object->device_caps));
654 if (GST_V4L2_IS_OPEN (v4l2object)) {
656 v4l2_close (v4l2object->video_fd);
657 v4l2object->video_fd = -1;
660 gst_v4l2_empty_lists (v4l2object);
667 gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other)
669 GST_DEBUG_OBJECT (v4l2object->element, "Trying to dup device %s",
672 GST_V4L2_CHECK_OPEN (other);
673 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
674 GST_V4L2_CHECK_NOT_ACTIVE (other);
675 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
677 v4l2object->vcap = other->vcap;
678 v4l2object->device_caps = other->device_caps;
679 gst_v4l2_adjust_buf_type (v4l2object);
681 v4l2object->video_fd = v4l2_dup (other->video_fd);
682 if (!GST_V4L2_IS_OPEN (v4l2object))
685 g_free (v4l2object->videodev);
686 v4l2object->videodev = g_strdup (other->videodev);
688 GST_INFO_OBJECT (v4l2object->element,
689 "Cloned device '%s' (%s) successfully",
690 v4l2object->vcap.card, v4l2object->videodev);
692 v4l2object->never_interlaced = other->never_interlaced;
698 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
699 (_("Could not dup device '%s' for reading and writing."),
700 v4l2object->videodev), GST_ERROR_SYSTEM);
707 /******************************************************
709 * close the video device (v4l2object->video_fd)
710 * return value: TRUE on success, FALSE on error
711 ******************************************************/
713 gst_v4l2_close (GstV4l2Object * v4l2object)
715 GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
716 v4l2object->videodev);
718 GST_V4L2_CHECK_OPEN (v4l2object);
719 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
722 v4l2_close (v4l2object->video_fd);
723 v4l2object->video_fd = -1;
726 gst_v4l2_empty_lists (v4l2object);
732 /******************************************************
733 * gst_v4l2_get_norm()
734 * Get the norm of the current device
735 * return value: TRUE on success, FALSE on error
736 ******************************************************/
738 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
740 GST_DEBUG_OBJECT (v4l2object->element, "getting norm");
742 if (!GST_V4L2_IS_OPEN (v4l2object))
745 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
753 GST_DEBUG ("Failed to get the current norm for device %s",
754 v4l2object->videodev);
760 /******************************************************
761 * gst_v4l2_set_norm()
762 * Set the norm of the current device
763 * return value: TRUE on success, FALSE on error
764 ******************************************************/
766 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
768 GST_DEBUG_OBJECT (v4l2object->element, "trying to set norm to "
769 "%" G_GINT64_MODIFIER "x", (guint64) norm);
771 if (!GST_V4L2_IS_OPEN (v4l2object))
774 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
782 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
783 (_("Failed to set norm for device '%s'."),
784 v4l2object->videodev), GST_ERROR_SYSTEM);
789 /******************************************************
790 * gst_v4l2_get_frequency():
791 * get the current frequency
792 * return value: TRUE on success, FALSE on error
793 ******************************************************/
795 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
796 gint tunernum, gulong * frequency)
798 struct v4l2_frequency freq = { 0, };
800 GstTunerChannel *channel;
802 GST_DEBUG_OBJECT (v4l2object->element, "getting current tuner frequency");
804 if (!GST_V4L2_IS_OPEN (v4l2object))
807 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
809 freq.tuner = tunernum;
810 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
813 *frequency = freq.frequency * channel->freq_multiplicator;
820 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
821 (_("Failed to get current tuner frequency for device '%s'."),
822 v4l2object->videodev), GST_ERROR_SYSTEM);
828 /******************************************************
829 * gst_v4l2_set_frequency():
831 * return value: TRUE on success, FALSE on error
832 ******************************************************/
834 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
835 gint tunernum, gulong frequency)
837 struct v4l2_frequency freq = { 0, };
839 GstTunerChannel *channel;
841 GST_DEBUG_OBJECT (v4l2object->element,
842 "setting current tuner frequency to %lu", frequency);
844 if (!GST_V4L2_IS_OPEN (v4l2object))
847 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
849 freq.tuner = tunernum;
850 /* fill in type - ignore error */
851 (void) v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
852 freq.frequency = frequency / channel->freq_multiplicator;
854 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
862 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
863 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
864 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
869 /******************************************************
870 * gst_v4l2_signal_strength():
871 * get the strength of the signal on the current input
872 * return value: TRUE on success, FALSE on error
873 ******************************************************/
875 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
876 gint tunernum, gulong * signal_strength)
878 struct v4l2_tuner tuner = { 0, };
880 GST_DEBUG_OBJECT (v4l2object->element, "trying to get signal strength");
882 if (!GST_V4L2_IS_OPEN (v4l2object))
885 tuner.index = tunernum;
886 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
889 *signal_strength = tuner.signal;
896 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
897 (_("Failed to get signal strength for device '%s'."),
898 v4l2object->videodev), GST_ERROR_SYSTEM);
903 /******************************************************
904 * gst_v4l2_get_attribute():
905 * try to get the value of one specific attribute
906 * return value: TRUE on success, FALSE on error
907 ******************************************************/
909 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
910 int attribute_num, int *value)
912 struct v4l2_control control = { 0, };
914 GST_DEBUG_OBJECT (v4l2object->element, "getting value of attribute %d",
917 if (!GST_V4L2_IS_OPEN (v4l2object))
920 control.id = attribute_num;
922 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
925 *value = control.value;
932 GST_WARNING_OBJECT (v4l2object,
933 _("Failed to get value for control %d on device '%s'."),
934 attribute_num, v4l2object->videodev);
940 /******************************************************
941 * gst_v4l2_set_attribute():
942 * try to set the value of one specific attribute
943 * return value: TRUE on success, FALSE on error
944 ******************************************************/
946 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
947 int attribute_num, const int value)
949 struct v4l2_control control = { 0, };
951 GST_DEBUG_OBJECT (v4l2object->element, "setting value of attribute %d to %d",
952 attribute_num, value);
954 if (!GST_V4L2_IS_OPEN (v4l2object))
957 control.id = attribute_num;
958 control.value = value;
959 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
967 GST_WARNING_OBJECT (v4l2object,
968 _("Failed to set value %d for control %d on device '%s'."),
969 value, attribute_num, v4l2object->videodev);
975 set_control (GQuark field_id, const GValue * value, gpointer user_data)
977 GstV4l2Object *v4l2object = user_data;
978 GQuark normalised_field_id;
981 /* 32 bytes is the maximum size for a control name according to v4l2 */
984 /* Backwards compatibility: in the past GStreamer would normalise strings in
985 a subtly different way to v4l2-ctl. e.g. the kernel's "Focus (absolute)"
986 would become "focus__absolute_" whereas now it becomes "focus_absolute".
987 Please remove the following in GStreamer 1.5 for 1.6 */
988 strncpy (name, g_quark_to_string (field_id), sizeof (name));
990 gst_v4l2_normalise_control_name (name);
991 normalised_field_id = g_quark_from_string (name);
992 if (normalised_field_id != field_id)
993 g_warning ("In GStreamer 1.4 the way V4L2 control names were normalised "
994 "changed. Instead of setting \"%s\" please use \"%s\". The former is "
995 "deprecated and will be removed in a future version of GStreamer",
996 g_quark_to_string (field_id), name);
997 field_id = normalised_field_id;
999 d = g_datalist_id_get_data (&v4l2object->controls, field_id);
1001 GST_WARNING_OBJECT (v4l2object,
1002 "Control '%s' does not exist or has an unsupported type.",
1003 g_quark_to_string (field_id));
1006 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
1007 GST_WARNING_OBJECT (v4l2object,
1008 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
1011 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
1012 g_value_get_int (value));
1017 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
1019 return gst_structure_foreach (controls, set_control, v4l2object);
1023 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
1027 GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
1029 if (!GST_V4L2_IS_OPEN (v4l2object))
1032 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
1037 GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
1043 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1044 /* only give a warning message if driver actually claims to have tuner
1047 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1048 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1054 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
1056 GST_DEBUG_OBJECT (v4l2object->element, "trying to set input to %d", input);
1058 if (!GST_V4L2_IS_OPEN (v4l2object))
1061 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
1068 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1069 /* only give a warning message if driver actually claims to have tuner
1072 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1073 (_("Failed to set input %d on device %s."),
1074 input, v4l2object->videodev), GST_ERROR_SYSTEM);
1080 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
1084 GST_DEBUG_OBJECT (v4l2object->element, "trying to get output");
1086 if (!GST_V4L2_IS_OPEN (v4l2object))
1089 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
1094 GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
1100 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1101 /* only give a warning message if driver actually claims to have tuner
1104 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1105 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1111 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
1113 GST_DEBUG_OBJECT (v4l2object->element, "trying to set output to %d", output);
1115 if (!GST_V4L2_IS_OPEN (v4l2object))
1118 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
1125 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1126 /* only give a warning message if driver actually claims to have tuner
1129 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1130 (_("Failed to set output %d on device %s."),
1131 output, v4l2object->videodev), GST_ERROR_SYSTEM);