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 "gstv4l2object.h"
42 #include "gstv4l2tuner.h"
43 #include "gstv4l2colorbalance.h"
45 #include "gstv4l2src.h"
46 #include "gstv4l2sink.h"
47 #include "gstv4l2videodec.h"
49 #include "gst/gst-i18n-plugin.h"
51 GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
52 #define GST_CAT_DEFAULT v4l2_debug
54 /******************************************************
55 * gst_v4l2_get_capabilities():
56 * get the device's capturing capabilities
57 * return value: TRUE on success, FALSE on error
58 ******************************************************/
60 gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
64 e = v4l2object->element;
66 GST_DEBUG_OBJECT (e, "getting capabilities");
68 if (!GST_V4L2_IS_OPEN (v4l2object))
71 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP,
72 &v4l2object->vcap) < 0)
75 if (v4l2object->vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
76 v4l2object->device_caps = v4l2object->vcap.device_caps;
78 v4l2object->device_caps = v4l2object->vcap.capabilities;
80 GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver);
81 GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card);
82 GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info);
83 GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version);
84 GST_LOG_OBJECT (e, "capabilites: %08x", v4l2object->device_caps);
91 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
92 (_("Error getting capabilities for device '%s': "
93 "It isn't a v4l2 driver. Check if it is a v4l1 driver."),
94 v4l2object->videodev), GST_ERROR_SYSTEM);
99 /******************************************************
100 * The video4linux command line tool v4l2-ctrl
101 * normalises the names of the controls received from
104 * "Exposure (absolute)" -> "exposure_absolute"
106 * We follow their lead here. @name is modified
108 ******************************************************/
110 gst_v4l2_normalise_control_name (gchar * name)
113 for (i = 0, j = 0; name[j]; ++j) {
114 if (g_ascii_isalnum (name[j])) {
115 if (i > 0 && !g_ascii_isalnum (name[j - 1]))
117 name[i++] = g_ascii_tolower (name[j]);
123 /******************************************************
124 * gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
125 * fill/empty the lists of enumerations
126 * return value: TRUE on success, FALSE on error
127 ******************************************************/
129 gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
132 struct v4l2_queryctrl control = { 0, };
136 e = v4l2object->element;
138 GST_DEBUG_OBJECT (e, "getting enumerations");
139 GST_V4L2_CHECK_OPEN (v4l2object);
141 GST_DEBUG_OBJECT (e, " channels");
142 /* and now, the channels */
144 struct v4l2_input input;
145 GstV4l2TunerChannel *v4l2channel;
146 GstTunerChannel *channel;
148 memset (&input, 0, sizeof (input));
151 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
152 if (errno == EINVAL || errno == ENOTTY)
153 break; /* end of enumeration */
155 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
156 (_("Failed to query attributes of input %d in device %s"),
157 n, v4l2object->videodev),
158 ("Failed to get %d in input enumeration for %s. (%d - %s)",
159 n, v4l2object->videodev, errno, strerror (errno)));
164 GST_LOG_OBJECT (e, " index: %d", input.index);
165 GST_LOG_OBJECT (e, " name: '%s'", input.name);
166 GST_LOG_OBJECT (e, " type: %08x", input.type);
167 GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
168 GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
169 (guint64) input.std);
170 GST_LOG_OBJECT (e, " status: %08x", input.status);
172 v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
173 channel = GST_TUNER_CHANNEL (v4l2channel);
174 channel->label = g_strdup ((const gchar *) input.name);
175 channel->flags = GST_TUNER_CHANNEL_INPUT;
176 v4l2channel->index = n;
178 if (input.type == V4L2_INPUT_TYPE_TUNER) {
179 struct v4l2_tuner vtun;
181 v4l2channel->tuner = input.tuner;
182 channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
184 vtun.index = input.tuner;
185 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
186 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
187 (_("Failed to get setting of tuner %d on device '%s'."),
188 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
189 g_object_unref (G_OBJECT (channel));
193 channel->freq_multiplicator =
194 62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
195 channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
196 channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
197 channel->min_signal = 0;
198 channel->max_signal = 0xffff;
200 if (input.audioset) {
201 /* we take the first. We don't care for
202 * the others for now */
203 while (!(input.audioset & (1 << v4l2channel->audio)))
204 v4l2channel->audio++;
205 channel->flags |= GST_TUNER_CHANNEL_AUDIO;
208 v4l2object->channels =
209 g_list_prepend (v4l2object->channels, (gpointer) channel);
211 v4l2object->channels = g_list_reverse (v4l2object->channels);
213 GST_DEBUG_OBJECT (e, " norms");
216 struct v4l2_standard standard = { 0, };
217 GstV4l2TunerNorm *v4l2norm;
221 /* fill in defaults */
222 standard.frameperiod.numerator = 1;
223 standard.frameperiod.denominator = 0;
226 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
227 if (errno == EINVAL || errno == ENOTTY)
228 break; /* end of enumeration */
230 else if (errno == ENODATA)
231 break; /* end of enumeration, as of Linux 3.7-rc1 */
234 GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
235 (_("Failed to query norm on device '%s'."),
236 v4l2object->videodev),
237 ("Failed to get attributes for norm %d on devide '%s'. (%d - %s)",
238 n, v4l2object->videodev, errno, strerror (errno)));
243 GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
244 standard.name, standard.frameperiod.denominator,
245 standard.frameperiod.numerator);
247 v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
248 norm = GST_TUNER_NORM (v4l2norm);
249 norm->label = g_strdup ((const gchar *) standard.name);
250 gst_value_set_fraction (&norm->framerate,
251 standard.frameperiod.denominator, standard.frameperiod.numerator);
252 v4l2norm->index = standard.id;
254 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "index=%08x, label=%s",
255 (unsigned int) v4l2norm->index, norm->label);
257 v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
259 v4l2object->norms = g_list_reverse (v4l2object->norms);
261 GST_DEBUG_OBJECT (e, " controls+menus");
263 /* and lastly, controls+menus (if appropriate) */
264 next = V4L2_CTRL_FLAG_NEXT_CTRL;
269 GstV4l2ColorBalanceChannel *v4l2channel;
270 GstColorBalanceChannel *channel;
276 /* when we reached the last official CID, continue with private CIDs */
277 if (n == V4L2_CID_LASTP1) {
278 GST_DEBUG_OBJECT (e, "checking private CIDs");
279 n = V4L2_CID_PRIVATE_BASE;
281 GST_DEBUG_OBJECT (e, "checking control %08x", n);
283 control.id = n | next;
284 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL,
288 GST_DEBUG_OBJECT (e, "controls finished");
291 GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
297 if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
298 if (n < V4L2_CID_PRIVATE_BASE) {
299 GST_DEBUG_OBJECT (e, "skipping control %08x", n);
300 /* continue so that we also check private controls */
301 n = V4L2_CID_PRIVATE_BASE - 1;
304 GST_DEBUG_OBJECT (e, "controls finished");
308 GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
309 "(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
313 /* bogus driver might mess with id in unexpected ways (e.g. set to 0), so
314 * make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */
317 if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
318 GST_DEBUG_OBJECT (e, "skipping disabled control");
322 if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
323 GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
327 switch (control.type) {
328 case V4L2_CTRL_TYPE_INTEGER:
329 case V4L2_CTRL_TYPE_BOOLEAN:
330 case V4L2_CTRL_TYPE_MENU:
331 case V4L2_CTRL_TYPE_INTEGER_MENU:
332 case V4L2_CTRL_TYPE_BITMASK:
333 case V4L2_CTRL_TYPE_BUTTON:{
334 control.name[31] = '\0';
335 gst_v4l2_normalise_control_name ((gchar *) control.name);
336 g_datalist_id_set_data (&v4l2object->controls,
337 g_quark_from_string ((const gchar *) control.name),
338 GINT_TO_POINTER (n));
343 "Control type for '%s' not suppored for extra controls.",
349 case V4L2_CID_BRIGHTNESS:
350 case V4L2_CID_CONTRAST:
351 case V4L2_CID_SATURATION:
353 case V4L2_CID_BLACK_LEVEL:
354 case V4L2_CID_AUTO_WHITE_BALANCE:
355 case V4L2_CID_DO_WHITE_BALANCE:
356 case V4L2_CID_RED_BALANCE:
357 case V4L2_CID_BLUE_BALANCE:
359 case V4L2_CID_EXPOSURE:
360 case V4L2_CID_AUTOGAIN:
362 case V4L2_CID_SHARPNESS:
363 /* we only handle these for now (why?) */
367 case V4L2_CID_PAN_RESET:
368 case V4L2_CID_TILT_RESET:
369 /* not handled here, handled by VideoOrientation interface */
372 case V4L2_CID_AUDIO_VOLUME:
373 case V4L2_CID_AUDIO_BALANCE:
374 case V4L2_CID_AUDIO_BASS:
375 case V4L2_CID_AUDIO_TREBLE:
376 case V4L2_CID_AUDIO_MUTE:
377 case V4L2_CID_AUDIO_LOUDNESS:
378 /* FIXME: We should implement GstMixer interface instead */
379 /* but let's not be pedantic and make element more useful for now */
381 case V4L2_CID_ALPHA_COMPONENT:
382 v4l2object->has_alpha_component = TRUE;
386 "ControlID %s (%x) unhandled, FIXME", control.name, n);
393 GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
394 v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
395 channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
396 channel->label = g_strdup ((const gchar *) control.name);
400 /* FIXME: it will be need just when handling private controls
401 *(currently none of base controls are of this type) */
402 if (control.type == V4L2_CTRL_TYPE_MENU) {
403 struct v4l2_querymenu menu, *mptr;
410 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU,
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->dbg_obj, "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->dbg_obj, "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))
548 if (v4l2object->fd_open)
549 libv4l2_fd = v4l2object->fd_open (v4l2object->video_fd,
550 V4L2_ENABLE_ENUM_FMT_EMULATION);
553 /* Note the v4l2_xxx functions are designed so that if they get passed an
554 unknown fd, the will behave exactly as their regular xxx counterparts, so
555 if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
556 cam format to normal formats conversion). Chances are big we will still
557 fail then though, as normally v4l2_fd_open only fails if the device is not
559 if (libv4l2_fd != -1)
560 v4l2object->video_fd = libv4l2_fd;
562 /* get capabilities, error will be posted */
563 if (!gst_v4l2_get_capabilities (v4l2object))
566 /* do we need to be a capture device? */
567 if (GST_IS_V4L2SRC (v4l2object->element) &&
568 !(v4l2object->device_caps & (V4L2_CAP_VIDEO_CAPTURE |
569 V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
572 if (GST_IS_V4L2SINK (v4l2object->element) &&
573 !(v4l2object->device_caps & (V4L2_CAP_VIDEO_OUTPUT |
574 V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
577 if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
578 /* Today's M2M device only expose M2M */
579 !((v4l2object->device_caps & (V4L2_CAP_VIDEO_M2M |
580 V4L2_CAP_VIDEO_M2M_MPLANE)) ||
581 /* But legacy driver may expose both CAPTURE and OUTPUT */
582 ((v4l2object->device_caps &
583 (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
584 (v4l2object->device_caps &
585 (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
588 gst_v4l2_adjust_buf_type (v4l2object);
590 /* create enumerations, posts errors. */
591 if (!gst_v4l2_fill_lists (v4l2object))
594 GST_INFO_OBJECT (v4l2object->dbg_obj,
595 "Opened device '%s' (%s) successfully",
596 v4l2object->vcap.card, v4l2object->videodev);
598 if (v4l2object->extra_controls)
599 gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
601 /* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
602 * causes expensive and slow USB IO, so don't probe them for interlaced
604 if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb") ||
605 !strcmp ((char *) v4l2object->vcap.driver, "uvcvideo")) {
606 v4l2object->never_interlaced = TRUE;
614 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
615 (_("Cannot identify device '%s'."), v4l2object->videodev),
621 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
622 (_("This isn't a device '%s'."), v4l2object->videodev),
628 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
629 (_("Could not open device '%s' for reading and writing."),
630 v4l2object->videodev), GST_ERROR_SYSTEM);
635 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
636 (_("Device '%s' is not a capture device."),
637 v4l2object->videodev),
638 ("Capabilities: 0x%x", v4l2object->device_caps));
643 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
644 (_("Device '%s' is not a output device."),
645 v4l2object->videodev),
646 ("Capabilities: 0x%x", v4l2object->device_caps));
651 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
652 (_("Device '%s' is not a M2M device."),
653 v4l2object->videodev),
654 ("Capabilities: 0x%x", v4l2object->device_caps));
659 if (GST_V4L2_IS_OPEN (v4l2object)) {
661 v4l2object->close (v4l2object->video_fd);
662 v4l2object->video_fd = -1;
665 gst_v4l2_empty_lists (v4l2object);
672 gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other)
674 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to dup device %s",
677 GST_V4L2_CHECK_OPEN (other);
678 GST_V4L2_CHECK_NOT_OPEN (v4l2object);
679 GST_V4L2_CHECK_NOT_ACTIVE (other);
680 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
682 v4l2object->vcap = other->vcap;
683 v4l2object->device_caps = other->device_caps;
684 gst_v4l2_adjust_buf_type (v4l2object);
686 v4l2object->video_fd = v4l2object->dup (other->video_fd);
687 if (!GST_V4L2_IS_OPEN (v4l2object))
690 g_free (v4l2object->videodev);
691 v4l2object->videodev = g_strdup (other->videodev);
693 GST_INFO_OBJECT (v4l2object->dbg_obj,
694 "Cloned device '%s' (%s) successfully",
695 v4l2object->vcap.card, v4l2object->videodev);
697 v4l2object->never_interlaced = other->never_interlaced;
703 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
704 (_("Could not dup device '%s' for reading and writing."),
705 v4l2object->videodev), GST_ERROR_SYSTEM);
712 /******************************************************
714 * close the video device (v4l2object->video_fd)
715 * return value: TRUE on success, FALSE on error
716 ******************************************************/
718 gst_v4l2_close (GstV4l2Object * v4l2object)
720 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to close %s",
721 v4l2object->videodev);
723 GST_V4L2_CHECK_OPEN (v4l2object);
724 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
727 v4l2object->close (v4l2object->video_fd);
728 v4l2object->video_fd = -1;
731 gst_v4l2_empty_lists (v4l2object);
737 /******************************************************
738 * gst_v4l2_get_norm()
739 * Get the norm of the current device
740 * return value: TRUE on success, FALSE on error
741 ******************************************************/
743 gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
745 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting norm");
747 if (!GST_V4L2_IS_OPEN (v4l2object))
750 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
758 GST_DEBUG ("Failed to get the current norm for device %s",
759 v4l2object->videodev);
765 /******************************************************
766 * gst_v4l2_set_norm()
767 * Set the norm of the current device
768 * return value: TRUE on success, FALSE on error
769 ******************************************************/
771 gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
773 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set norm to "
774 "%" G_GINT64_MODIFIER "x", (guint64) norm);
776 if (!GST_V4L2_IS_OPEN (v4l2object))
779 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
787 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
788 (_("Failed to set norm for device '%s'."),
789 v4l2object->videodev), GST_ERROR_SYSTEM);
794 /******************************************************
795 * gst_v4l2_get_frequency():
796 * get the current frequency
797 * return value: TRUE on success, FALSE on error
798 ******************************************************/
800 gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
801 gint tunernum, gulong * frequency)
803 struct v4l2_frequency freq = { 0, };
805 GstTunerChannel *channel;
807 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting current tuner frequency");
809 if (!GST_V4L2_IS_OPEN (v4l2object))
812 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
814 freq.tuner = tunernum;
815 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
818 *frequency = freq.frequency * channel->freq_multiplicator;
825 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
826 (_("Failed to get current tuner frequency for device '%s'."),
827 v4l2object->videodev), GST_ERROR_SYSTEM);
833 /******************************************************
834 * gst_v4l2_set_frequency():
836 * return value: TRUE on success, FALSE on error
837 ******************************************************/
839 gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
840 gint tunernum, gulong frequency)
842 struct v4l2_frequency freq = { 0, };
844 GstTunerChannel *channel;
846 GST_DEBUG_OBJECT (v4l2object->dbg_obj,
847 "setting current tuner frequency to %lu", frequency);
849 if (!GST_V4L2_IS_OPEN (v4l2object))
852 channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
854 freq.tuner = tunernum;
855 /* fill in type - ignore error */
856 (void) v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
857 freq.frequency = frequency / channel->freq_multiplicator;
859 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
867 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
868 (_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
869 v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
874 /******************************************************
875 * gst_v4l2_signal_strength():
876 * get the strength of the signal on the current input
877 * return value: TRUE on success, FALSE on error
878 ******************************************************/
880 gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
881 gint tunernum, gulong * signal_strength)
883 struct v4l2_tuner tuner = { 0, };
885 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get signal strength");
887 if (!GST_V4L2_IS_OPEN (v4l2object))
890 tuner.index = tunernum;
891 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
894 *signal_strength = tuner.signal;
901 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
902 (_("Failed to get signal strength for device '%s'."),
903 v4l2object->videodev), GST_ERROR_SYSTEM);
908 /******************************************************
909 * gst_v4l2_get_attribute():
910 * try to get the value of one specific attribute
911 * return value: TRUE on success, FALSE on error
912 ******************************************************/
914 gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
915 int attribute_num, int *value)
917 struct v4l2_control control = { 0, };
919 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting value of attribute %d",
922 if (!GST_V4L2_IS_OPEN (v4l2object))
925 control.id = attribute_num;
927 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
930 *value = control.value;
937 GST_WARNING_OBJECT (v4l2object,
938 _("Failed to get value for control %d on device '%s'."),
939 attribute_num, v4l2object->videodev);
945 /******************************************************
946 * gst_v4l2_set_attribute():
947 * try to set the value of one specific attribute
948 * return value: TRUE on success, FALSE on error
949 ******************************************************/
951 gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
952 int attribute_num, const int value)
954 struct v4l2_control control = { 0, };
956 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "setting value of attribute %d to %d",
957 attribute_num, value);
959 if (!GST_V4L2_IS_OPEN (v4l2object))
962 control.id = attribute_num;
963 control.value = value;
964 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
972 GST_WARNING_OBJECT (v4l2object,
973 _("Failed to set value %d for control %d on device '%s'."),
974 value, attribute_num, v4l2object->videodev);
980 set_control (GQuark field_id, const GValue * value, gpointer user_data)
982 GstV4l2Object *v4l2object = user_data;
983 GQuark normalised_field_id;
986 /* 32 bytes is the maximum size for a control name according to v4l2 */
989 /* Backwards compatibility: in the past GStreamer would normalise strings in
990 a subtly different way to v4l2-ctl. e.g. the kernel's "Focus (absolute)"
991 would become "focus__absolute_" whereas now it becomes "focus_absolute".
992 Please remove the following in GStreamer 1.5 for 1.6 */
993 strncpy (name, g_quark_to_string (field_id), sizeof (name));
995 gst_v4l2_normalise_control_name (name);
996 normalised_field_id = g_quark_from_string (name);
997 if (normalised_field_id != field_id)
998 g_warning ("In GStreamer 1.4 the way V4L2 control names were normalised "
999 "changed. Instead of setting \"%s\" please use \"%s\". The former is "
1000 "deprecated and will be removed in a future version of GStreamer",
1001 g_quark_to_string (field_id), name);
1002 field_id = normalised_field_id;
1004 d = g_datalist_id_get_data (&v4l2object->controls, field_id);
1006 GST_WARNING_OBJECT (v4l2object,
1007 "Control '%s' does not exist or has an unsupported type.",
1008 g_quark_to_string (field_id));
1011 if (!G_VALUE_HOLDS (value, G_TYPE_INT)) {
1012 GST_WARNING_OBJECT (v4l2object,
1013 "'int' value expected for control '%s'.", g_quark_to_string (field_id));
1016 gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
1017 g_value_get_int (value));
1022 gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
1024 return gst_structure_foreach (controls, set_control, v4l2object);
1028 gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
1032 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get input");
1034 if (!GST_V4L2_IS_OPEN (v4l2object))
1037 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
1042 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "input: %d", n);
1048 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1049 /* only give a warning message if driver actually claims to have tuner
1052 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1053 (_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1059 gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
1061 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set input to %d", input);
1063 if (!GST_V4L2_IS_OPEN (v4l2object))
1066 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
1073 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1074 /* only give a warning message if driver actually claims to have tuner
1077 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1078 (_("Failed to set input %d on device %s."),
1079 input, v4l2object->videodev), GST_ERROR_SYSTEM);
1085 gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
1089 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get output");
1091 if (!GST_V4L2_IS_OPEN (v4l2object))
1094 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
1099 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "output: %d", n);
1105 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1106 /* only give a warning message if driver actually claims to have tuner
1109 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1110 (_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
1116 gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
1118 GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set output to %d", output);
1120 if (!GST_V4L2_IS_OPEN (v4l2object))
1123 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
1130 if (v4l2object->device_caps & V4L2_CAP_TUNER) {
1131 /* only give a warning message if driver actually claims to have tuner
1134 GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
1135 (_("Failed to set output %d on device %s."),
1136 output, v4l2object->videodev), GST_ERROR_SYSTEM);