3 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
6 * gstv4l2object.c: base class for V4L2 elements
8 * This library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Library General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. This library is distributed in the hope
12 * that it will be useful, but WITHOUT ANY WARRANTY; without even the
13 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
14 * PURPOSE. See the GNU Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
32 #include <gudev/gudev.h>
35 #include "v4l2_calls.h"
36 #include "gstv4l2tuner.h"
38 #include "gstv4l2xoverlay.h"
40 #include "gstv4l2colorbalance.h"
42 #include "gst/gst-i18n-plugin.h"
44 /* videodev2.h is not versioned and we can't easily check for the presence
45 * of enum values at compile time, but the V4L2_CAP_VIDEO_OUTPUT_OVERLAY define
46 * was added in the same commit as V4L2_FIELD_INTERLACED_{TB,BT} (b2787845) */
47 #ifndef V4L2_CAP_VIDEO_OUTPUT_OVERLAY
48 #define V4L2_FIELD_INTERLACED_TB 8
49 #define V4L2_FIELD_INTERLACED_BT 9
52 GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
53 #define GST_CAT_DEFAULT v4l2_debug
56 #define DEFAULT_PROP_DEVICE_NAME NULL
57 #define DEFAULT_PROP_DEVICE_FD -1
58 #define DEFAULT_PROP_FLAGS 0
59 #define DEFAULT_PROP_TV_NORM 0
60 #define DEFAULT_PROP_CHANNEL NULL
61 #define DEFAULT_PROP_FREQUENCY 0
66 V4L2_STD_OBJECT_PROPS,
70 gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
72 GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
73 static GList *list = NULL;
75 /* well, not perfect, but better than no locking at all.
76 * In the worst case we leak a list node, so who cares? */
77 GST_CLASS_LOCK (GST_OBJECT_CLASS (klass));
80 list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
83 GST_CLASS_UNLOCK (GST_OBJECT_CLASS (klass));
88 static gboolean init = FALSE;
89 static GList *devices = NULL;
93 gst_v4l2_class_probe_devices_with_udev (GstElementClass * klass, gboolean check,
94 GList ** klass_devices)
96 GUdevClient *client = NULL;
101 gchar *device = devices->data;
102 devices = g_list_remove (devices, device);
106 GST_INFO ("Enumerating video4linux devices from udev");
107 client = g_udev_client_new (NULL);
109 GST_WARNING ("Failed to initialize gudev client");
113 item = g_udev_client_query_by_subsystem (client, "video4linux");
115 GUdevDevice *device = item->data;
116 gchar *devnode = g_strdup (g_udev_device_get_device_file (device));
117 gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION");
118 GST_INFO ("Found new device: %s, API: %d", devnode, api);
119 /* Append v4l2 devices only. If api is 0 probably v4l_id has
120 been stripped out of the current udev installation, append
124 ("Couldn't retrieve ID_V4L_VERSION, silly udev installation?");
126 if ((api == 2 || api == 0)) {
127 devices = g_list_append (devices, devnode);
131 g_object_unref (device);
140 g_object_unref (client);
143 *klass_devices = devices;
147 #endif /* HAVE_GUDEV */
150 gst_v4l2_class_probe_devices (GstElementClass * klass, gboolean check,
151 GList ** klass_devices)
154 const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
158 gchar *device = devices->data;
159 devices = g_list_remove (devices, device);
164 * detect /dev entries
166 for (n = 0; n < 64; n++) {
167 for (base = 0; dev_base[base] != NULL; base++) {
169 gchar *device = g_strdup_printf ("%s%d",
174 * does the /dev/ entry exist at all?
176 if (stat (device, &s) == 0) {
178 * yes: is a device attached?
180 if (S_ISCHR (s.st_mode)) {
182 if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 0 || errno == EBUSY) {
186 devices = g_list_append (devices, device);
197 *klass_devices = devices;
203 gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
204 guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
206 GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
211 if (!gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices))
212 gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
213 #else /* !HAVE_GUDEV */
214 gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
215 #endif /* HAVE_GUDEV */
218 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
224 gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
225 guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
227 GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
228 gboolean ret = FALSE;
234 !gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices);
235 #else /* !HAVE_GUDEV */
236 ret = !gst_v4l2_class_probe_devices (klass, TRUE, klass_devices);
237 #endif /* HAVE_GUDEV */
240 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
247 gst_v4l2_class_list_devices (GstElementClass * klass, GList ** klass_devices)
250 GValue value = { 0 };
256 array = g_value_array_new (g_list_length (*klass_devices));
257 item = *klass_devices;
258 g_value_init (&value, G_TYPE_STRING);
260 gchar *device = item->data;
262 g_value_set_string (&value, device);
263 g_value_array_append (array, &value);
267 g_value_unset (&value);
273 gst_v4l2_probe_get_values (GstPropertyProbe * probe,
274 guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
276 GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
277 GValueArray *array = NULL;
281 array = gst_v4l2_class_list_devices (klass, klass_devices);
284 G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
291 #define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
293 gst_v4l2_device_get_type (void)
295 static GType v4l2_device_type = 0;
297 if (v4l2_device_type == 0) {
298 static const GFlagsValue values[] = {
299 {V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"},
300 {V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"},
301 {V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"},
303 {V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"},
304 {V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"},
306 {V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"},
307 {V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"},
313 g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
316 return v4l2_device_type;
319 #define GST_TYPE_V4L2_TV_NORM (gst_v4l2_tv_norm_get_type ())
321 gst_v4l2_tv_norm_get_type (void)
323 static GType v4l2_tv_norm = 0;
326 static const GEnumValue tv_norms[] = {
329 {V4L2_STD_NTSC, "NTSC", "NTSC"},
330 {V4L2_STD_NTSC_M, "NTSC-M", "NTSC-M"},
331 {V4L2_STD_NTSC_M_JP, "NTSC-M-JP", "NTSC-M-JP"},
332 {V4L2_STD_NTSC_M_KR, "NTSC-M-KR", "NTSC-M-KR"},
333 {V4L2_STD_NTSC_443, "NTSC-443", "NTSC-443"},
335 {V4L2_STD_PAL, "PAL", "PAL"},
336 {V4L2_STD_PAL_BG, "PAL-BG", "PAL-BG"},
337 {V4L2_STD_PAL_B, "PAL-B", "PAL-B"},
338 {V4L2_STD_PAL_B1, "PAL-B1", "PAL-B1"},
339 {V4L2_STD_PAL_G, "PAL-G", "PAL-G"},
340 {V4L2_STD_PAL_H, "PAL-H", "PAL-H"},
341 {V4L2_STD_PAL_I, "PAL-I", "PAL-I"},
342 {V4L2_STD_PAL_DK, "PAL-DK", "PAL-DK"},
343 {V4L2_STD_PAL_D, "PAL-D", "PAL-D"},
344 {V4L2_STD_PAL_D1, "PAL-D1", "PAL-D1"},
345 {V4L2_STD_PAL_K, "PAL-K", "PAL-K"},
346 {V4L2_STD_PAL_M, "PAL-M", "PAL-M"},
347 {V4L2_STD_PAL_N, "PAL-N", "PAL-N"},
348 {V4L2_STD_PAL_Nc, "PAL-Nc", "PAL-Nc"},
349 {V4L2_STD_PAL_60, "PAL-60", "PAL-60"},
351 {V4L2_STD_SECAM, "SECAM", "SECAM"},
352 {V4L2_STD_SECAM_B, "SECAM-B", "SECAM-B"},
353 {V4L2_STD_SECAM_G, "SECAM-G", "SECAM-G"},
354 {V4L2_STD_SECAM_H, "SECAM-H", "SECAM-H"},
355 {V4L2_STD_SECAM_DK, "SECAM-DK", "SECAM-DK"},
356 {V4L2_STD_SECAM_D, "SECAM-D", "SECAM-D"},
357 {V4L2_STD_SECAM_K, "SECAM-K", "SECAM-K"},
358 {V4L2_STD_SECAM_K1, "SECAM-K1", "SECAM-K1"},
359 {V4L2_STD_SECAM_L, "SECAM-L", "SECAM-L"},
360 {V4L2_STD_SECAM_LC, "SECAM-Lc", "SECAM-Lc"},
365 v4l2_tv_norm = g_enum_register_static ("V4L2_TV_norms", tv_norms);
372 gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
373 const char *default_device)
375 g_object_class_install_property (gobject_class, PROP_DEVICE,
376 g_param_spec_string ("device", "Device", "Device location",
377 default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
378 g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
379 g_param_spec_string ("device-name", "Device name",
380 "Name of the device", DEFAULT_PROP_DEVICE_NAME,
381 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
382 g_object_class_install_property (gobject_class, PROP_DEVICE_FD,
383 g_param_spec_int ("device-fd", "File descriptor",
384 "File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD,
385 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
386 g_object_class_install_property (gobject_class, PROP_FLAGS,
387 g_param_spec_flags ("flags", "Flags", "Device type flags",
388 GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS,
389 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
392 * GstV4l2Src:brightness
394 * Picture brightness, or more precisely, the black level
398 g_object_class_install_property (gobject_class, PROP_BRIGHTNESS,
399 g_param_spec_int ("brightness", "Brightness",
400 "Picture brightness, or more precisely, the black level", G_MININT,
402 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
404 * GstV4l2Src:contrast
406 * Picture contrast or luma gain
410 g_object_class_install_property (gobject_class, PROP_CONTRAST,
411 g_param_spec_int ("contrast", "Contrast",
412 "Picture contrast or luma gain", G_MININT,
414 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
416 * GstV4l2Src:saturation
418 * Picture color saturation or chroma gain
422 g_object_class_install_property (gobject_class, PROP_SATURATION,
423 g_param_spec_int ("saturation", "Saturation",
424 "Picture color saturation or chroma gain", G_MININT,
426 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
430 * Hue or color balance
434 g_object_class_install_property (gobject_class, PROP_HUE,
435 g_param_spec_int ("hue", "Hue",
436 "Hue or color balance", G_MININT,
438 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
447 g_object_class_install_property (gobject_class, PROP_TV_NORM,
448 g_param_spec_enum ("norm", "TV norm",
450 GST_TYPE_V4L2_TV_NORM, DEFAULT_PROP_TV_NORM,
451 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
455 gst_v4l2_object_new (GstElement * element,
456 enum v4l2_buf_type type,
457 const char *default_device,
458 GstV4l2GetInOutFunction get_in_out_func,
459 GstV4l2SetInOutFunction set_in_out_func,
460 GstV4l2UpdateFpsFunction update_fps_func)
462 GstV4l2Object *v4l2object;
465 * some default values
467 v4l2object = g_new0 (GstV4l2Object, 1);
469 v4l2object->type = type;
470 v4l2object->formats = NULL;
472 v4l2object->element = element;
473 v4l2object->get_in_out_func = get_in_out_func;
474 v4l2object->set_in_out_func = set_in_out_func;
475 v4l2object->update_fps_func = update_fps_func;
477 v4l2object->video_fd = -1;
478 v4l2object->poll = gst_poll_new (TRUE);
479 v4l2object->buffer = NULL;
480 v4l2object->videodev = g_strdup (default_device);
482 v4l2object->norms = NULL;
483 v4l2object->channels = NULL;
484 v4l2object->colors = NULL;
486 v4l2object->xwindow_id = 0;
491 static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object);
495 gst_v4l2_object_destroy (GstV4l2Object * v4l2object)
497 g_return_if_fail (v4l2object != NULL);
499 if (v4l2object->videodev)
500 g_free (v4l2object->videodev);
502 if (v4l2object->poll)
503 gst_poll_free (v4l2object->poll);
505 if (v4l2object->channel)
506 g_free (v4l2object->channel);
508 if (v4l2object->formats) {
509 gst_v4l2_object_clear_format_list (v4l2object);
517 gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object)
519 g_slist_foreach (v4l2object->formats, (GFunc) g_free, NULL);
520 g_slist_free (v4l2object->formats);
521 v4l2object->formats = NULL;
527 gst_v4l2_object_prop_to_cid (guint prop_id)
532 case PROP_BRIGHTNESS:
533 cid = V4L2_CID_BRIGHTNESS;
536 cid = V4L2_CID_CONTRAST;
538 case PROP_SATURATION:
539 cid = V4L2_CID_SATURATION;
545 GST_WARNING ("unmapped property id: %d", prop_id);
552 gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
553 guint prop_id, const GValue * value, GParamSpec * pspec)
557 g_free (v4l2object->videodev);
558 v4l2object->videodev = g_value_dup_string (value);
560 case PROP_BRIGHTNESS:
562 case PROP_SATURATION:
565 gint cid = gst_v4l2_object_prop_to_cid (prop_id);
568 if (GST_V4L2_IS_OPEN (v4l2object)) {
569 gst_v4l2_set_attribute (v4l2object, cid, g_value_get_int (value));
576 v4l2object->tv_norm = g_value_get_enum (value);
580 if (GST_V4L2_IS_OPEN (v4l2object)) {
581 GstTuner *tuner = GST_TUNER (v4l2object->element);
582 GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
583 (gchar *) g_value_get_string (value));
586 /* like gst_tuner_set_channel (tuner, channel)
587 without g_object_notify */
588 gst_v4l2_tuner_set_channel (v4l2object, channel);
591 g_free (v4l2object->channel);
592 v4l2object->channel = g_value_dup_string (value);
596 if (GST_V4L2_IS_OPEN (v4l2object)) {
597 GstTuner *tuner = GST_TUNER (v4l2object->element);
598 GstTunerChannel *channel = gst_tuner_get_channel (tuner);
601 GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
603 gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value))
604 without g_object_notify */
605 gst_v4l2_tuner_set_frequency (v4l2object, channel,
606 g_value_get_ulong (value));
609 v4l2object->frequency = g_value_get_ulong (value);
622 gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
623 guint prop_id, GValue * value, GParamSpec * pspec)
627 g_value_set_string (value, v4l2object->videodev);
629 case PROP_DEVICE_NAME:
631 const guchar *new = NULL;
633 if (GST_V4L2_IS_OPEN (v4l2object)) {
634 new = v4l2object->vcap.card;
635 } else if (gst_v4l2_open (v4l2object)) {
636 new = v4l2object->vcap.card;
637 gst_v4l2_close (v4l2object);
639 g_value_set_string (value, (gchar *) new);
644 if (GST_V4L2_IS_OPEN (v4l2object))
645 g_value_set_int (value, v4l2object->video_fd);
647 g_value_set_int (value, DEFAULT_PROP_DEVICE_FD);
654 if (GST_V4L2_IS_OPEN (v4l2object)) {
655 flags |= v4l2object->vcap.capabilities &
656 (V4L2_CAP_VIDEO_CAPTURE |
657 V4L2_CAP_VIDEO_OUTPUT |
658 V4L2_CAP_VIDEO_OVERLAY |
659 V4L2_CAP_VBI_CAPTURE |
660 V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
662 g_value_set_flags (value, flags);
665 case PROP_BRIGHTNESS:
667 case PROP_SATURATION:
670 gint cid = gst_v4l2_object_prop_to_cid (prop_id);
673 if (GST_V4L2_IS_OPEN (v4l2object)) {
675 if (gst_v4l2_get_attribute (v4l2object, cid, &v)) {
676 g_value_set_int (value, v);
684 g_value_set_enum (value, v4l2object->tv_norm);
694 gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
696 GstTunerNorm *norm = NULL;
697 GstTunerChannel *channel = NULL;
700 if (!GST_IS_TUNER (v4l2object->element))
703 tuner = GST_TUNER (v4l2object->element);
705 if (v4l2object->tv_norm)
706 norm = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm);
707 GST_DEBUG_OBJECT (v4l2object->element, "tv_norm=0x%" G_GINT64_MODIFIER "x, "
708 "norm=%p", (guint64) v4l2object->tv_norm, norm);
710 gst_tuner_set_norm (tuner, norm);
713 GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
715 v4l2object->tv_norm =
716 gst_v4l2_tuner_get_std_id_by_norm (v4l2object, norm);
717 gst_tuner_norm_changed (tuner, norm);
721 if (v4l2object->channel)
722 channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
724 gst_tuner_set_channel (tuner, channel);
727 GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER
728 (v4l2object->element)));
730 g_free (v4l2object->channel);
731 v4l2object->channel = g_strdup (channel->label);
732 gst_tuner_channel_changed (tuner, channel);
737 && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
738 if (v4l2object->frequency != 0) {
739 gst_tuner_set_frequency (tuner, channel, v4l2object->frequency);
741 v4l2object->frequency = gst_tuner_get_frequency (tuner, channel);
742 if (v4l2object->frequency == 0) {
744 gst_tuner_set_frequency (tuner, channel, 1000);
752 gst_v4l2_object_start (GstV4l2Object * v4l2object)
754 if (gst_v4l2_open (v4l2object))
755 gst_v4l2_set_defaults (v4l2object);
760 gst_v4l2_xoverlay_start (v4l2object);
767 gst_v4l2_object_stop (GstV4l2Object * v4l2object)
770 gst_v4l2_xoverlay_stop (v4l2object);
773 if (!gst_v4l2_close (v4l2object))
776 if (v4l2object->formats) {
777 gst_v4l2_object_clear_format_list (v4l2object);
785 * common format / caps utilities:
793 static const GstV4L2FormatDesc gst_v4l2_formats[] = {
794 /* from Linux 2.6.15 videodev2.h */
795 {V4L2_PIX_FMT_RGB332, TRUE},
796 {V4L2_PIX_FMT_RGB555, TRUE},
797 {V4L2_PIX_FMT_RGB565, TRUE},
798 {V4L2_PIX_FMT_RGB555X, TRUE},
799 {V4L2_PIX_FMT_RGB565X, TRUE},
800 {V4L2_PIX_FMT_BGR24, TRUE},
801 {V4L2_PIX_FMT_RGB24, TRUE},
802 {V4L2_PIX_FMT_BGR32, TRUE},
803 {V4L2_PIX_FMT_RGB32, TRUE},
804 {V4L2_PIX_FMT_GREY, TRUE},
805 {V4L2_PIX_FMT_YVU410, TRUE},
806 {V4L2_PIX_FMT_YVU420, TRUE},
807 {V4L2_PIX_FMT_YUYV, TRUE},
808 {V4L2_PIX_FMT_UYVY, TRUE},
809 {V4L2_PIX_FMT_YUV422P, TRUE},
810 {V4L2_PIX_FMT_YUV411P, TRUE},
811 {V4L2_PIX_FMT_Y41P, TRUE},
813 /* two planes -- one Y, one Cr + Cb interleaved */
814 {V4L2_PIX_FMT_NV12, TRUE},
815 {V4L2_PIX_FMT_NV21, TRUE},
817 /* The following formats are not defined in the V4L2 specification */
818 {V4L2_PIX_FMT_YUV410, TRUE},
819 {V4L2_PIX_FMT_YUV420, TRUE},
820 {V4L2_PIX_FMT_YYUV, TRUE},
821 {V4L2_PIX_FMT_HI240, TRUE},
823 /* see http://www.siliconimaging.com/RGB%20Bayer.htm */
824 #ifdef V4L2_PIX_FMT_SBGGR8
825 {V4L2_PIX_FMT_SBGGR8, TRUE},
828 /* compressed formats */
829 {V4L2_PIX_FMT_MJPEG, TRUE},
830 {V4L2_PIX_FMT_JPEG, TRUE},
831 #ifdef V4L2_PIX_FMT_PJPG
832 {V4L2_PIX_FMT_PJPG, TRUE},
834 {V4L2_PIX_FMT_DV, TRUE},
835 {V4L2_PIX_FMT_MPEG, FALSE},
837 /* Vendor-specific formats */
838 {V4L2_PIX_FMT_WNVA, TRUE},
840 #ifdef V4L2_PIX_FMT_SN9C10X
841 {V4L2_PIX_FMT_SN9C10X, TRUE},
843 #ifdef V4L2_PIX_FMT_PWC1
844 {V4L2_PIX_FMT_PWC1, TRUE},
846 #ifdef V4L2_PIX_FMT_PWC2
847 {V4L2_PIX_FMT_PWC2, TRUE},
849 #ifdef V4L2_PIX_FMT_YVYU
850 {V4L2_PIX_FMT_YVYU, TRUE},
854 #define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats))
857 static struct v4l2_fmtdesc *
858 gst_v4l2_object_get_format_from_fourcc (GstV4l2Object * v4l2object,
861 struct v4l2_fmtdesc *fmt;
867 walk = gst_v4l2_object_get_format_list (v4l2object);
869 fmt = (struct v4l2_fmtdesc *) walk->data;
870 if (fmt->pixelformat == fourcc)
872 /* special case for jpeg */
873 if (fmt->pixelformat == V4L2_PIX_FMT_MJPEG ||
874 fmt->pixelformat == V4L2_PIX_FMT_JPEG
875 #ifdef V4L2_PIX_FMT_PJPG
876 || fmt->pixelformat == V4L2_PIX_FMT_PJPG
879 if (fourcc == V4L2_PIX_FMT_JPEG || fourcc == V4L2_PIX_FMT_MJPEG
880 #ifdef V4L2_PIX_FMT_PJPG
881 || fourcc == V4L2_PIX_FMT_PJPG
887 walk = g_slist_next (walk);
895 /* complete made up ranking, the values themselves are meaningless */
896 #define YUV_BASE_RANK 1000
897 #define JPEG_BASE_RANK 500
898 #define DV_BASE_RANK 200
899 #define RGB_BASE_RANK 100
900 #define YUV_ODD_BASE_RANK 50
901 #define RGB_ODD_BASE_RANK 25
902 #define BAYER_BASE_RANK 15
903 #define S910_BASE_RANK 10
904 #define GREY_BASE_RANK 5
905 #define PWC_BASE_RANK 1
907 /* This flag is already used by libv4l2 although
908 * it was added to the Linux kernel in 2.6.32
910 #ifndef V4L2_FMT_FLAG_EMULATED
911 #define V4L2_FMT_FLAG_EMULATED 0x0002
915 gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
917 guint32 fourcc = fmt->pixelformat;
918 gboolean emulated = ((fmt->flags & V4L2_FMT_FLAG_EMULATED) != 0);
922 case V4L2_PIX_FMT_MJPEG:
923 #ifdef V4L2_PIX_FMT_PJPG
924 case V4L2_PIX_FMT_PJPG:
925 rank = JPEG_BASE_RANK;
928 case V4L2_PIX_FMT_JPEG:
929 rank = JPEG_BASE_RANK + 1;
931 case V4L2_PIX_FMT_MPEG: /* MPEG */
932 rank = JPEG_BASE_RANK + 2;
935 case V4L2_PIX_FMT_RGB332:
936 case V4L2_PIX_FMT_RGB555:
937 case V4L2_PIX_FMT_RGB555X:
938 case V4L2_PIX_FMT_RGB565:
939 case V4L2_PIX_FMT_RGB565X:
940 rank = RGB_ODD_BASE_RANK;
943 case V4L2_PIX_FMT_RGB24:
944 case V4L2_PIX_FMT_BGR24:
945 rank = RGB_BASE_RANK - 1;
948 case V4L2_PIX_FMT_RGB32:
949 case V4L2_PIX_FMT_BGR32:
950 rank = RGB_BASE_RANK;
953 case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
954 rank = GREY_BASE_RANK;
957 case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */
958 case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */
959 case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */
960 case V4L2_PIX_FMT_HI240: /* 8 8-bit color */
961 rank = YUV_ODD_BASE_RANK;
964 case V4L2_PIX_FMT_YVU410: /* YVU9, 9 bits per pixel */
965 rank = YUV_BASE_RANK + 3;
967 case V4L2_PIX_FMT_YUV410: /* YUV9, 9 bits per pixel */
968 rank = YUV_BASE_RANK + 2;
970 case V4L2_PIX_FMT_YUV420: /* I420, 12 bits per pixel */
971 rank = YUV_BASE_RANK + 7;
973 case V4L2_PIX_FMT_YUYV: /* YUY2, 16 bits per pixel */
974 rank = YUV_BASE_RANK + 10;
976 case V4L2_PIX_FMT_YVU420: /* YV12, 12 bits per pixel */
977 rank = YUV_BASE_RANK + 6;
979 case V4L2_PIX_FMT_UYVY: /* UYVY, 16 bits per pixel */
980 rank = YUV_BASE_RANK + 9;
982 case V4L2_PIX_FMT_Y41P: /* Y41P, 12 bits per pixel */
983 rank = YUV_BASE_RANK + 5;
985 case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */
986 rank = YUV_BASE_RANK + 4;
988 case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */
989 rank = YUV_BASE_RANK + 8;
992 case V4L2_PIX_FMT_DV:
996 case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
1000 #ifdef V4L2_PIX_FMT_SBGGR8
1001 case V4L2_PIX_FMT_SBGGR8:
1002 rank = BAYER_BASE_RANK;
1006 #ifdef V4L2_PIX_FMT_SN9C10X
1007 case V4L2_PIX_FMT_SN9C10X:
1008 rank = S910_BASE_RANK;
1012 #ifdef V4L2_PIX_FMT_PWC1
1013 case V4L2_PIX_FMT_PWC1:
1014 rank = PWC_BASE_RANK;
1017 #ifdef V4L2_PIX_FMT_PWC2
1018 case V4L2_PIX_FMT_PWC2:
1019 rank = PWC_BASE_RANK;
1028 /* All ranks are below 1<<15 so a shift by 15
1029 * will a) make all non-emulated formats larger
1030 * than emulated and b) will not overflow
1041 format_cmp_func (gconstpointer a, gconstpointer b)
1043 const struct v4l2_fmtdesc *fa = a;
1044 const struct v4l2_fmtdesc *fb = b;
1046 if (fa->pixelformat == fb->pixelformat)
1049 return gst_v4l2_object_format_get_rank (fb) -
1050 gst_v4l2_object_format_get_rank (fa);
1053 /******************************************************
1054 * gst_v4l2_object_fill_format_list():
1055 * create list of supported capture formats
1056 * return value: TRUE on success, FALSE on error
1057 ******************************************************/
1059 gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object)
1062 struct v4l2_fmtdesc *format;
1064 GST_DEBUG_OBJECT (v4l2object->element, "getting src format enumerations");
1066 /* format enumeration */
1068 format = g_new0 (struct v4l2_fmtdesc, 1);
1071 format->type = v4l2object->type;
1073 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
1074 if (errno == EINVAL) {
1076 break; /* end of enumeration */
1082 GST_LOG_OBJECT (v4l2object->element, "index: %u", format->index);
1083 GST_LOG_OBJECT (v4l2object->element, "type: %d", format->type);
1084 GST_LOG_OBJECT (v4l2object->element, "flags: %08x", format->flags);
1085 GST_LOG_OBJECT (v4l2object->element, "description: '%s'",
1086 format->description);
1087 GST_LOG_OBJECT (v4l2object->element, "pixelformat: %" GST_FOURCC_FORMAT,
1088 GST_FOURCC_ARGS (format->pixelformat));
1090 /* sort formats according to our preference; we do this, because caps
1091 * are probed in the order the formats are in the list, and the order of
1092 * formats in the final probed caps matters for things like fixation */
1093 v4l2object->formats = g_slist_insert_sorted (v4l2object->formats, format,
1094 (GCompareFunc) format_cmp_func);
1097 #ifndef GST_DISABLE_GST_DEBUG
1101 GST_INFO_OBJECT (v4l2object->element, "got %d format(s):", n);
1102 for (l = v4l2object->formats; l != NULL; l = l->next) {
1105 GST_INFO_OBJECT (v4l2object->element,
1106 " %" GST_FOURCC_FORMAT "%s", GST_FOURCC_ARGS (format->pixelformat),
1107 ((format->flags & V4L2_FMT_FLAG_EMULATED)) ? " (emulated)" : "");
1117 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
1118 (_("Failed to enumerate possible video formats device '%s' can work with"), v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, g_strerror (errno)));
1125 * Get the list of supported capture formats, a list of
1126 * <code>struct v4l2_fmtdesc</code>.
1129 gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object)
1131 if (!v4l2object->formats)
1132 gst_v4l2_object_fill_format_list (v4l2object);
1133 return v4l2object->formats;
1138 gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc)
1140 GstStructure *structure = NULL;
1143 case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */
1144 #ifdef V4L2_PIX_FMT_PJPG
1145 case V4L2_PIX_FMT_PJPG: /* Progressive-JPEG */
1147 case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
1148 structure = gst_structure_new ("image/jpeg", NULL);
1150 case V4L2_PIX_FMT_RGB332:
1151 case V4L2_PIX_FMT_RGB555:
1152 case V4L2_PIX_FMT_RGB555X:
1153 case V4L2_PIX_FMT_RGB565:
1154 case V4L2_PIX_FMT_RGB565X:
1155 case V4L2_PIX_FMT_RGB24:
1156 case V4L2_PIX_FMT_BGR24:
1157 case V4L2_PIX_FMT_RGB32:
1158 case V4L2_PIX_FMT_BGR32:{
1159 guint depth = 0, bpp = 0;
1161 gint endianness = 0;
1163 guint32 r_mask = 0, b_mask = 0, g_mask = 0;
1166 case V4L2_PIX_FMT_RGB332:
1168 endianness = G_BYTE_ORDER; /* 'like, whatever' */
1173 case V4L2_PIX_FMT_RGB555:
1174 case V4L2_PIX_FMT_RGB555X:
1178 fourcc == V4L2_PIX_FMT_RGB555X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN;
1183 case V4L2_PIX_FMT_RGB565:
1184 case V4L2_PIX_FMT_RGB565X:
1187 fourcc == V4L2_PIX_FMT_RGB565X ? G_BIG_ENDIAN : G_LITTLE_ENDIAN;
1192 case V4L2_PIX_FMT_RGB24:
1194 endianness = G_BIG_ENDIAN;
1199 case V4L2_PIX_FMT_BGR24:
1201 endianness = G_BIG_ENDIAN;
1206 case V4L2_PIX_FMT_RGB32:
1208 endianness = G_BIG_ENDIAN;
1209 r_mask = 0xff000000;
1210 g_mask = 0x00ff0000;
1211 b_mask = 0x0000ff00;
1213 case V4L2_PIX_FMT_BGR32:
1215 endianness = G_BIG_ENDIAN;
1216 r_mask = 0x000000ff;
1217 g_mask = 0x0000ff00;
1218 b_mask = 0x00ff0000;
1221 g_assert_not_reached ();
1224 structure = gst_structure_new ("video/x-raw-rgb",
1225 "bpp", G_TYPE_INT, bpp,
1226 "depth", G_TYPE_INT, depth,
1227 "red_mask", G_TYPE_INT, r_mask,
1228 "green_mask", G_TYPE_INT, g_mask,
1229 "blue_mask", G_TYPE_INT, b_mask,
1230 "endianness", G_TYPE_INT, endianness, NULL);
1233 case V4L2_PIX_FMT_GREY: /* 8 Greyscale */
1234 structure = gst_structure_new ("video/x-raw-gray",
1235 "bpp", G_TYPE_INT, 8, NULL);
1237 case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */
1238 case V4L2_PIX_FMT_HI240: /* 8 8-bit color */
1239 /* FIXME: get correct fourccs here */
1241 case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */
1242 case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */
1243 case V4L2_PIX_FMT_YVU410:
1244 case V4L2_PIX_FMT_YUV410:
1245 case V4L2_PIX_FMT_YUV420: /* I420/IYUV */
1246 case V4L2_PIX_FMT_YUYV:
1247 case V4L2_PIX_FMT_YVU420:
1248 case V4L2_PIX_FMT_UYVY:
1249 case V4L2_PIX_FMT_Y41P:
1250 case V4L2_PIX_FMT_YUV422P:
1251 #ifdef V4L2_PIX_FMT_YVYU
1252 case V4L2_PIX_FMT_YVYU:
1254 case V4L2_PIX_FMT_YUV411P:{
1258 case V4L2_PIX_FMT_NV12:
1259 fcc = GST_MAKE_FOURCC ('N', 'V', '1', '2');
1261 case V4L2_PIX_FMT_NV21:
1262 fcc = GST_MAKE_FOURCC ('N', 'V', '2', '1');
1264 case V4L2_PIX_FMT_YVU410:
1265 fcc = GST_MAKE_FOURCC ('Y', 'V', 'U', '9');
1267 case V4L2_PIX_FMT_YUV410:
1268 fcc = GST_MAKE_FOURCC ('Y', 'U', 'V', '9');
1270 case V4L2_PIX_FMT_YUV420:
1271 fcc = GST_MAKE_FOURCC ('I', '4', '2', '0');
1273 case V4L2_PIX_FMT_YUYV:
1274 fcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
1276 case V4L2_PIX_FMT_YVU420:
1277 fcc = GST_MAKE_FOURCC ('Y', 'V', '1', '2');
1279 case V4L2_PIX_FMT_UYVY:
1280 fcc = GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y');
1282 case V4L2_PIX_FMT_Y41P:
1283 fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'P');
1285 case V4L2_PIX_FMT_YUV411P:
1286 fcc = GST_MAKE_FOURCC ('Y', '4', '1', 'B');
1288 case V4L2_PIX_FMT_YUV422P:
1289 fcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
1291 #ifdef V4L2_PIX_FMT_YVYU
1292 case V4L2_PIX_FMT_YVYU:
1293 fcc = GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U');
1297 g_assert_not_reached ();
1300 structure = gst_structure_new ("video/x-raw-yuv",
1301 "format", GST_TYPE_FOURCC, fcc, NULL);
1304 case V4L2_PIX_FMT_DV:
1306 gst_structure_new ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE,
1309 case V4L2_PIX_FMT_MPEG: /* MPEG */
1310 structure = gst_structure_new ("video/mpegts", NULL);
1312 case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */
1314 #ifdef V4L2_PIX_FMT_SBGGR8
1315 case V4L2_PIX_FMT_SBGGR8:
1316 structure = gst_structure_new ("video/x-raw-bayer", NULL);
1319 #ifdef V4L2_PIX_FMT_SN9C10X
1320 case V4L2_PIX_FMT_SN9C10X:
1321 structure = gst_structure_new ("video/x-sonix", NULL);
1324 #ifdef V4L2_PIX_FMT_PWC1
1325 case V4L2_PIX_FMT_PWC1:
1326 structure = gst_structure_new ("video/x-pwc1", NULL);
1329 #ifdef V4L2_PIX_FMT_PWC2
1330 case V4L2_PIX_FMT_PWC2:
1331 structure = gst_structure_new ("video/x-pwc2", NULL);
1335 GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT,
1336 fourcc, GST_FOURCC_ARGS (fourcc));
1346 gst_v4l2_object_get_all_caps (void)
1348 static GstCaps *caps = NULL;
1351 GstStructure *structure;
1355 caps = gst_caps_new_empty ();
1356 for (i = 0; i < GST_V4L2_FORMAT_COUNT; i++) {
1358 gst_v4l2_object_v4l2fourcc_to_structure (gst_v4l2_formats[i].format);
1360 if (gst_v4l2_formats[i].dimensions) {
1361 gst_structure_set (structure,
1362 "width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
1363 "height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
1364 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL);
1366 gst_caps_append_structure (caps, structure);
1371 return gst_caps_ref (caps);
1375 /* collect data for the given caps
1376 * @caps: given input caps
1377 * @format: location for the v4l format
1378 * @w/@h: location for width and height
1379 * @fps_n/@fps_d: location for framerate
1380 * @size: location for expected size of the frame or 0 if unknown
1383 gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
1384 struct v4l2_fmtdesc ** format, gint * w, gint * h,
1385 gboolean * interlaced, guint * fps_n, guint * fps_d, guint * size)
1387 GstStructure *structure;
1388 const GValue *framerate;
1390 const gchar *mimetype;
1393 /* default unknown values */
1397 structure = gst_caps_get_structure (caps, 0);
1399 mimetype = gst_structure_get_name (structure);
1401 if (strcmp (mimetype, "video/mpegts") == 0) {
1402 fourcc = V4L2_PIX_FMT_MPEG;
1408 if (!gst_structure_get_int (structure, "width", w))
1411 if (!gst_structure_get_int (structure, "height", h))
1414 if (!gst_structure_get_boolean (structure, "interlaced", interlaced))
1415 *interlaced = FALSE;
1417 framerate = gst_structure_get_value (structure, "framerate");
1421 *fps_n = gst_value_get_fraction_numerator (framerate);
1422 *fps_d = gst_value_get_fraction_denominator (framerate);
1424 if (!strcmp (mimetype, "video/x-raw-yuv")) {
1425 gst_structure_get_fourcc (structure, "format", &fourcc);
1428 case GST_MAKE_FOURCC ('I', '4', '2', '0'):
1429 case GST_MAKE_FOURCC ('I', 'Y', 'U', 'V'):
1430 fourcc = V4L2_PIX_FMT_YUV420;
1431 outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
1432 outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
1434 case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
1435 fourcc = V4L2_PIX_FMT_YUYV;
1436 outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
1438 case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
1439 fourcc = V4L2_PIX_FMT_Y41P;
1440 outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
1442 case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
1443 fourcc = V4L2_PIX_FMT_UYVY;
1444 outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
1446 case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
1447 fourcc = V4L2_PIX_FMT_YVU420;
1448 outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
1449 outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * (GST_ROUND_UP_2 (*h) / 2));
1451 case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
1452 fourcc = V4L2_PIX_FMT_YUV411P;
1453 outsize = GST_ROUND_UP_4 (*w) * *h;
1454 outsize += 2 * ((GST_ROUND_UP_8 (*w) / 4) * *h);
1456 case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
1457 fourcc = V4L2_PIX_FMT_YUV422P;
1458 outsize = GST_ROUND_UP_4 (*w) * *h;
1459 outsize += 2 * ((GST_ROUND_UP_8 (*w) / 2) * *h);
1461 case GST_MAKE_FOURCC ('N', 'V', '1', '2'):
1462 fourcc = V4L2_PIX_FMT_NV12;
1463 outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
1464 outsize += (GST_ROUND_UP_4 (*w) * *h) / 2;
1466 case GST_MAKE_FOURCC ('N', 'V', '2', '1'):
1467 fourcc = V4L2_PIX_FMT_NV21;
1468 outsize = GST_ROUND_UP_4 (*w) * GST_ROUND_UP_2 (*h);
1469 outsize += (GST_ROUND_UP_4 (*w) * *h) / 2;
1471 #ifdef V4L2_PIX_FMT_YVYU
1472 case GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'):
1473 fourcc = V4L2_PIX_FMT_YVYU;
1474 outsize = (GST_ROUND_UP_2 (*w) * 2) * *h;
1478 } else if (!strcmp (mimetype, "video/x-raw-rgb")) {
1479 gint depth, endianness, r_mask;
1481 gst_structure_get_int (structure, "depth", &depth);
1482 gst_structure_get_int (structure, "endianness", &endianness);
1483 gst_structure_get_int (structure, "red_mask", &r_mask);
1487 fourcc = V4L2_PIX_FMT_RGB332;
1490 fourcc = (endianness == G_LITTLE_ENDIAN) ?
1491 V4L2_PIX_FMT_RGB555 : V4L2_PIX_FMT_RGB555X;
1494 fourcc = (endianness == G_LITTLE_ENDIAN) ?
1495 V4L2_PIX_FMT_RGB565 : V4L2_PIX_FMT_RGB565X;
1498 fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR24 : V4L2_PIX_FMT_RGB24;
1501 fourcc = (r_mask == 0xFF) ? V4L2_PIX_FMT_BGR32 : V4L2_PIX_FMT_RGB32;
1504 } else if (strcmp (mimetype, "video/x-dv") == 0) {
1505 fourcc = V4L2_PIX_FMT_DV;
1506 } else if (strcmp (mimetype, "image/jpeg") == 0) {
1507 fourcc = V4L2_PIX_FMT_JPEG;
1508 #ifdef V4L2_PIX_FMT_SBGGR8
1509 } else if (strcmp (mimetype, "video/x-raw-bayer") == 0) {
1510 fourcc = V4L2_PIX_FMT_SBGGR8;
1512 #ifdef V4L2_PIX_FMT_SN9C10X
1513 } else if (strcmp (mimetype, "video/x-sonix") == 0) {
1514 fourcc = V4L2_PIX_FMT_SN9C10X;
1516 #ifdef V4L2_PIX_FMT_PWC1
1517 } else if (strcmp (mimetype, "video/x-pwc1") == 0) {
1518 fourcc = V4L2_PIX_FMT_PWC1;
1520 #ifdef V4L2_PIX_FMT_PWC2
1521 } else if (strcmp (mimetype, "video/x-pwc2") == 0) {
1522 fourcc = V4L2_PIX_FMT_PWC2;
1524 } else if (strcmp (mimetype, "video/x-raw-gray") == 0) {
1525 fourcc = V4L2_PIX_FMT_GREY;
1532 *format = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc);
1540 gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
1541 guint32 pixelformat, gint * width, gint * height, gboolean * interlaced);
1544 /* The frame interval enumeration code first appeared in Linux 2.6.19. */
1545 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1546 static GstStructure *
1547 gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object,
1548 guint32 pixelformat,
1549 guint32 width, guint32 height, const GstStructure * template)
1551 gint fd = v4l2object->video_fd;
1552 struct v4l2_frmivalenum ival;
1555 GValue rates = { 0, };
1556 gboolean interlaced;
1557 gint int_width = width;
1558 gint int_height = height;
1560 /* interlaced detection using VIDIOC_TRY/S_FMT */
1561 if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat,
1562 &int_width, &int_height, &interlaced))
1565 memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
1567 ival.pixel_format = pixelformat;
1569 ival.height = height;
1571 GST_LOG_OBJECT (v4l2object->element,
1572 "get frame interval for %ux%u, %" GST_FOURCC_FORMAT, width, height,
1573 GST_FOURCC_ARGS (pixelformat));
1575 /* keep in mind that v4l2 gives us frame intervals (durations); we invert the
1576 * fraction to get framerate */
1577 if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
1578 goto enum_frameintervals_failed;
1580 if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
1581 GValue rate = { 0, };
1583 g_value_init (&rates, GST_TYPE_LIST);
1584 g_value_init (&rate, GST_TYPE_FRACTION);
1587 num = ival.discrete.numerator;
1588 denom = ival.discrete.denominator;
1590 if (num > G_MAXINT || denom > G_MAXINT) {
1591 /* let us hope we don't get here... */
1596 GST_LOG_OBJECT (v4l2object->element, "adding discrete framerate: %d/%d",
1599 /* swap to get the framerate */
1600 gst_value_set_fraction (&rate, denom, num);
1601 gst_value_list_append_value (&rates, &rate);
1604 } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
1605 } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
1606 GValue min = { 0, };
1607 GValue step = { 0, };
1608 GValue max = { 0, };
1609 gboolean added = FALSE;
1610 guint32 minnum, mindenom;
1611 guint32 maxnum, maxdenom;
1613 g_value_init (&rates, GST_TYPE_LIST);
1615 g_value_init (&min, GST_TYPE_FRACTION);
1616 g_value_init (&step, GST_TYPE_FRACTION);
1617 g_value_init (&max, GST_TYPE_FRACTION);
1620 minnum = ival.stepwise.min.numerator;
1621 mindenom = ival.stepwise.min.denominator;
1622 if (minnum > G_MAXINT || mindenom > G_MAXINT) {
1626 GST_LOG_OBJECT (v4l2object->element, "stepwise min frame interval: %d/%d",
1628 gst_value_set_fraction (&min, minnum, mindenom);
1631 maxnum = ival.stepwise.max.numerator;
1632 maxdenom = ival.stepwise.max.denominator;
1633 if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
1638 GST_LOG_OBJECT (v4l2object->element, "stepwise max frame interval: %d/%d",
1640 gst_value_set_fraction (&max, maxnum, maxdenom);
1643 num = ival.stepwise.step.numerator;
1644 denom = ival.stepwise.step.denominator;
1645 if (num > G_MAXINT || denom > G_MAXINT) {
1650 if (num == 0 || denom == 0) {
1651 /* in this case we have a wrong fraction or no step, set the step to max
1652 * so that we only add the min value in the loop below */
1657 /* since we only have gst_value_fraction_subtract and not add, negate the
1659 GST_LOG_OBJECT (v4l2object->element, "stepwise step frame interval: %d/%d",
1661 gst_value_set_fraction (&step, -num, denom);
1663 while (gst_value_compare (&min, &max) <= 0) {
1664 GValue rate = { 0, };
1666 num = gst_value_get_fraction_numerator (&min);
1667 denom = gst_value_get_fraction_denominator (&min);
1668 GST_LOG_OBJECT (v4l2object->element, "adding stepwise framerate: %d/%d",
1671 /* invert to get the framerate */
1672 g_value_init (&rate, GST_TYPE_FRACTION);
1673 gst_value_set_fraction (&rate, denom, num);
1674 gst_value_list_append_value (&rates, &rate);
1677 /* we're actually adding because step was negated above. This is because
1678 * there is no _add function... */
1679 if (!gst_value_fraction_subtract (&min, &min, &step)) {
1680 GST_WARNING_OBJECT (v4l2object->element, "could not step fraction!");
1685 /* no range was added, leave the default range from the template */
1686 GST_WARNING_OBJECT (v4l2object->element,
1687 "no range added, leaving default");
1688 g_value_unset (&rates);
1690 } else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
1691 guint32 maxnum, maxdenom;
1693 g_value_init (&rates, GST_TYPE_FRACTION_RANGE);
1695 num = ival.stepwise.min.numerator;
1696 denom = ival.stepwise.min.denominator;
1697 if (num > G_MAXINT || denom > G_MAXINT) {
1702 maxnum = ival.stepwise.max.numerator;
1703 maxdenom = ival.stepwise.max.denominator;
1704 if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
1709 GST_LOG_OBJECT (v4l2object->element,
1710 "continuous frame interval %d/%d to %d/%d", maxdenom, maxnum, denom,
1713 gst_value_set_fraction_range_full (&rates, maxdenom, maxnum, denom, num);
1719 s = gst_structure_copy (template);
1720 gst_structure_set (s, "width", G_TYPE_INT, (gint) width,
1721 "height", G_TYPE_INT, (gint) height,
1722 "interlaced", G_TYPE_BOOLEAN, interlaced, NULL);
1724 if (G_IS_VALUE (&rates)) {
1725 /* only change the framerate on the template when we have a valid probed new
1727 gst_structure_set_value (s, "framerate", &rates);
1728 g_value_unset (&rates);
1730 gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1,
1736 enum_frameintervals_failed:
1738 GST_DEBUG_OBJECT (v4l2object->element,
1739 "Unable to enumerate intervals for %" GST_FOURCC_FORMAT "@%ux%u",
1740 GST_FOURCC_ARGS (pixelformat), width, height);
1745 /* I don't see how this is actually an error, we ignore the format then */
1746 GST_WARNING_OBJECT (v4l2object->element,
1747 "Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u",
1748 GST_FOURCC_ARGS (pixelformat), width, height, ival.type);
1752 #endif /* defined VIDIOC_ENUM_FRAMEINTERVALS */
1754 #ifdef VIDIOC_ENUM_FRAMESIZES
1756 sort_by_frame_size (GstStructure * s1, GstStructure * s2)
1760 gst_structure_get_int (s1, "width", &w1);
1761 gst_structure_get_int (s1, "height", &h1);
1762 gst_structure_get_int (s2, "width", &w2);
1763 gst_structure_get_int (s2, "height", &h2);
1765 /* I think it's safe to assume that this won't overflow for a while */
1766 return ((w2 * h2) - (w1 * h1));
1771 gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
1772 guint32 pixelformat, const GstStructure * template)
1774 GstCaps *ret = gst_caps_new_empty ();
1777 #ifdef VIDIOC_ENUM_FRAMESIZES
1778 gint fd = v4l2object->video_fd;
1779 struct v4l2_frmsizeenum size;
1780 GList *results = NULL;
1783 if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))
1784 return gst_caps_new_simple ("video/mpegts", NULL);
1786 memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
1788 size.pixel_format = pixelformat;
1790 GST_DEBUG_OBJECT (v4l2object->element, "Enumerating frame sizes");
1792 if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
1793 goto enum_framesizes_failed;
1795 if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
1797 GST_LOG_OBJECT (v4l2object->element, "got discrete frame size %dx%d",
1798 size.discrete.width, size.discrete.height);
1800 w = MIN (size.discrete.width, G_MAXINT);
1801 h = MIN (size.discrete.height, G_MAXINT);
1805 gst_v4l2_object_probe_caps_for_format_and_size (v4l2object,
1806 pixelformat, w, h, template);
1809 results = g_list_prepend (results, tmp);
1813 } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
1814 GST_DEBUG_OBJECT (v4l2object->element,
1815 "done iterating discrete frame sizes");
1816 } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
1817 GST_DEBUG_OBJECT (v4l2object->element, "we have stepwise frame sizes:");
1818 GST_DEBUG_OBJECT (v4l2object->element, "min width: %d",
1819 size.stepwise.min_width);
1820 GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
1821 size.stepwise.min_height);
1822 GST_DEBUG_OBJECT (v4l2object->element, "max width: %d",
1823 size.stepwise.max_width);
1824 GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
1825 size.stepwise.max_height);
1826 GST_DEBUG_OBJECT (v4l2object->element, "step width: %d",
1827 size.stepwise.step_width);
1828 GST_DEBUG_OBJECT (v4l2object->element, "step height: %d",
1829 size.stepwise.step_height);
1831 for (w = size.stepwise.min_width, h = size.stepwise.min_height;
1832 w < size.stepwise.max_width && h < size.stepwise.max_height;
1833 w += size.stepwise.step_width, h += size.stepwise.step_height) {
1834 if (w == 0 || h == 0)
1838 gst_v4l2_object_probe_caps_for_format_and_size (v4l2object,
1839 pixelformat, w, h, template);
1842 results = g_list_prepend (results, tmp);
1844 GST_DEBUG_OBJECT (v4l2object->element,
1845 "done iterating stepwise frame sizes");
1846 } else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
1849 GST_DEBUG_OBJECT (v4l2object->element, "we have continuous frame sizes:");
1850 GST_DEBUG_OBJECT (v4l2object->element, "min width: %d",
1851 size.stepwise.min_width);
1852 GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
1853 size.stepwise.min_height);
1854 GST_DEBUG_OBJECT (v4l2object->element, "max width: %d",
1855 size.stepwise.max_width);
1856 GST_DEBUG_OBJECT (v4l2object->element, "min height: %d",
1857 size.stepwise.max_height);
1859 w = MAX (size.stepwise.min_width, 1);
1860 h = MAX (size.stepwise.min_height, 1);
1861 maxw = MIN (size.stepwise.max_width, G_MAXINT);
1862 maxh = MIN (size.stepwise.max_height, G_MAXINT);
1865 gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat,
1868 gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w,
1869 (gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh,
1872 /* no point using the results list here, since there's only one struct */
1873 gst_caps_append_structure (ret, tmp);
1879 /* we use an intermediary list to store and then sort the results of the
1880 * probing because we can't make any assumptions about the order in which
1881 * the driver will give us the sizes, but we want the final caps to contain
1882 * the results starting with the highest resolution and having the lowest
1883 * resolution last, since order in caps matters for things like fixation. */
1884 results = g_list_sort (results, (GCompareFunc) sort_by_frame_size);
1885 while (results != NULL) {
1886 gst_caps_append_structure (ret, GST_STRUCTURE (results->data));
1887 results = g_list_delete_link (results, results);
1890 if (gst_caps_is_empty (ret))
1891 goto enum_framesizes_no_results;
1896 enum_framesizes_failed:
1898 /* I don't see how this is actually an error */
1899 GST_DEBUG_OBJECT (v4l2object->element,
1900 "Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT
1901 " (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno));
1902 goto default_frame_sizes;
1904 enum_framesizes_no_results:
1906 /* it's possible that VIDIOC_ENUM_FRAMESIZES is defined but the driver in
1907 * question doesn't actually support it yet */
1908 GST_DEBUG_OBJECT (v4l2object->element,
1909 "No results for pixelformat %" GST_FOURCC_FORMAT
1910 " enumerating frame sizes, trying fallback",
1911 GST_FOURCC_ARGS (pixelformat));
1912 goto default_frame_sizes;
1916 GST_WARNING_OBJECT (v4l2object->element,
1917 "Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT
1918 ": %u", GST_FOURCC_ARGS (pixelformat), size.type);
1919 goto default_frame_sizes;
1921 default_frame_sizes:
1922 #endif /* defined VIDIOC_ENUM_FRAMESIZES */
1924 gint min_w, max_w, min_h, max_h, fix_num = 0, fix_denom = 0;
1925 gboolean interlaced;
1927 /* This code is for Linux < 2.6.19 */
1929 max_w = max_h = GST_V4L2_MAX_SIZE;
1930 if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &min_w,
1931 &min_h, &interlaced)) {
1932 GST_WARNING_OBJECT (v4l2object->element,
1933 "Could not probe minimum capture size for pixelformat %"
1934 GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
1936 if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &max_w,
1937 &max_h, &interlaced)) {
1938 GST_WARNING_OBJECT (v4l2object->element,
1939 "Could not probe maximum capture size for pixelformat %"
1940 GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat));
1943 /* Since we can't get framerate directly, try to use the current norm */
1944 if (v4l2object->tv_norm && v4l2object->norms) {
1946 GstTunerNorm *norm = NULL;
1947 GstTunerNorm *current =
1948 gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm);
1950 for (norms = v4l2object->norms; norms != NULL; norms = norms->next) {
1951 norm = (GstTunerNorm *) norms->data;
1952 if (!strcmp (norm->label, current->label))
1955 /* If it's possible, set framerate to that (discrete) value */
1957 fix_num = gst_value_get_fraction_numerator (&norm->framerate);
1958 fix_denom = gst_value_get_fraction_denominator (&norm->framerate);
1962 tmp = gst_structure_copy (template);
1964 gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION, fix_num,
1967 /* if norm can't be used, copy the template framerate */
1968 gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
1973 gst_structure_set (tmp, "width", G_TYPE_INT, max_w, NULL);
1975 gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, min_w, max_w, NULL);
1978 gst_structure_set (tmp, "height", G_TYPE_INT, max_h, NULL);
1980 gst_structure_set (tmp, "height", GST_TYPE_INT_RANGE, min_h, max_h, NULL);
1982 gst_structure_set (tmp, "interlaced", G_TYPE_BOOLEAN, interlaced, NULL);
1984 gst_caps_append_structure (ret, tmp);
1991 gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
1992 guint32 pixelformat, gint * width, gint * height, gboolean * interlaced)
1994 struct v4l2_format fmt, prevfmt;
1999 g_return_val_if_fail (width != NULL, FALSE);
2000 g_return_val_if_fail (height != NULL, FALSE);
2002 GST_LOG_OBJECT (v4l2object->element,
2003 "getting nearest size to %dx%d with format %" GST_FOURCC_FORMAT,
2004 *width, *height, GST_FOURCC_ARGS (pixelformat));
2006 fd = v4l2object->video_fd;
2008 /* Some drivers are buggy and will modify the currently set format
2009 when processing VIDIOC_TRY_FMT, so we remember what is set at the
2010 minute, and will reset it when done. */
2011 prevfmt_valid = (v4l2_ioctl (fd, VIDIOC_G_FMT, &prevfmt) >= 0);
2013 /* get size delimiters */
2014 memset (&fmt, 0, sizeof (fmt));
2015 fmt.type = v4l2object->type;
2016 fmt.fmt.pix.width = *width;
2017 fmt.fmt.pix.height = *height;
2018 fmt.fmt.pix.pixelformat = pixelformat;
2019 fmt.fmt.pix.field = V4L2_FIELD_NONE;
2021 r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
2022 if (r < 0 && errno == EINVAL) {
2023 /* try again with interlaced video */
2024 fmt.fmt.pix.width = *width;
2025 fmt.fmt.pix.height = *height;
2026 fmt.fmt.pix.pixelformat = pixelformat;
2027 fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
2028 r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
2032 /* The driver might not implement TRY_FMT, in which case we will try
2034 if (errno != ENOTTY)
2037 /* Only try S_FMT if we're not actively capturing yet, which we shouldn't
2038 be, because we're still probing */
2039 if (GST_V4L2_IS_ACTIVE (v4l2object))
2042 GST_LOG_OBJECT (v4l2object->element,
2043 "Failed to probe size limit with VIDIOC_TRY_FMT, trying VIDIOC_S_FMT");
2045 fmt.fmt.pix.width = *width;
2046 fmt.fmt.pix.height = *height;
2048 r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
2049 if (r < 0 && errno == EINVAL) {
2050 /* try again with progressive video */
2051 fmt.fmt.pix.width = *width;
2052 fmt.fmt.pix.height = *height;
2053 fmt.fmt.pix.pixelformat = pixelformat;
2054 fmt.fmt.pix.field = V4L2_FIELD_NONE;
2055 r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
2062 GST_LOG_OBJECT (v4l2object->element,
2063 "got nearest size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
2065 *width = fmt.fmt.pix.width;
2066 *height = fmt.fmt.pix.height;
2068 switch (fmt.fmt.pix.field) {
2069 case V4L2_FIELD_ANY:
2070 case V4L2_FIELD_NONE:
2071 *interlaced = FALSE;
2073 case V4L2_FIELD_INTERLACED:
2074 case V4L2_FIELD_INTERLACED_TB:
2075 case V4L2_FIELD_INTERLACED_BT:
2079 GST_WARNING_OBJECT (v4l2object->element,
2080 "Unsupported field type for %" GST_FOURCC_FORMAT "@%ux%u",
2081 GST_FOURCC_ARGS (pixelformat), *width, *height);
2086 v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt);
2091 v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt);
2097 gst_v4l2_object_set_format (GstV4l2Object * v4l2object, guint32 pixelformat,
2098 guint32 width, guint32 height, gboolean interlaced)
2100 gint fd = v4l2object->video_fd;
2101 struct v4l2_format format;
2102 enum v4l2_field field;
2105 GST_DEBUG_OBJECT (v4l2object->element, "interlaced video");
2106 /* ideally we would differentiate between types of interlaced video
2107 * but there is not sufficient information in the caps..
2109 field = V4L2_FIELD_INTERLACED;
2111 GST_DEBUG_OBJECT (v4l2object->element, "progressive video");
2112 field = V4L2_FIELD_NONE;
2115 GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format "
2116 "%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat));
2118 GST_V4L2_CHECK_OPEN (v4l2object);
2119 GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
2121 /* Only unconditionally accept mpegts for sources */
2122 if ((v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
2123 (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')))
2126 memset (&format, 0x00, sizeof (struct v4l2_format));
2127 format.type = v4l2object->type;
2129 if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
2130 goto get_fmt_failed;
2132 if (format.type == v4l2object->type &&
2133 format.fmt.pix.width == width &&
2134 format.fmt.pix.height == height &&
2135 format.fmt.pix.pixelformat == pixelformat &&
2136 format.fmt.pix.field == field) {
2137 /* Nothing to do. We want to succeed immediately
2138 * here because setting the same format back
2139 * can still fail due to EBUSY. By short-circuiting
2140 * here, we allow pausing and re-playing pipelines
2141 * with changed caps, as long as the changed caps
2142 * do not change the webcam's format. Otherwise,
2143 * any caps change would require us to go to NULL
2144 * state to close the device and set format.
2149 format.type = v4l2object->type;
2150 format.fmt.pix.width = width;
2151 format.fmt.pix.height = height;
2152 format.fmt.pix.pixelformat = pixelformat;
2153 format.fmt.pix.field = field;
2155 if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
2156 goto set_fmt_failed;
2159 if (format.fmt.pix.width != width || format.fmt.pix.height != height)
2160 goto invalid_dimensions;
2162 if (format.fmt.pix.pixelformat != pixelformat)
2163 goto invalid_pixelformat;
2170 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
2171 (_("Device '%s' does not support video capture"),
2172 v4l2object->videodev),
2173 ("Call to G_FMT failed: (%s)", g_strerror (errno)));
2178 if (errno == EBUSY) {
2179 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, BUSY,
2180 (_("Device '%s' is busy"), v4l2object->videodev),
2181 ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
2182 GST_FOURCC_ARGS (pixelformat), width, height,
2183 g_strerror (errno)));
2185 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
2186 (_("Device '%s' cannot capture at %dx%d"),
2187 v4l2object->videodev, width, height),
2188 ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
2189 GST_FOURCC_ARGS (pixelformat), width, height,
2190 g_strerror (errno)));
2196 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
2197 (_("Device '%s' cannot capture at %dx%d"),
2198 v4l2object->videodev, width, height),
2199 ("Tried to capture at %dx%d, but device returned size %dx%d",
2200 width, height, format.fmt.pix.width, format.fmt.pix.height));
2203 invalid_pixelformat:
2205 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
2206 (_("Device '%s' cannot capture in the specified format"),
2207 v4l2object->videodev),
2208 ("Tried to capture in %" GST_FOURCC_FORMAT
2209 ", but device returned format" " %" GST_FOURCC_FORMAT,
2210 GST_FOURCC_ARGS (pixelformat),
2211 GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
2217 gst_v4l2_object_start_streaming (GstV4l2Object * v4l2object)
2219 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMON,
2220 &(v4l2object->type)) < 0) {
2221 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
2222 (_("Error starting streaming on device '%s'."), v4l2object->videodev),
2230 gst_v4l2_object_stop_streaming (GstV4l2Object * v4l2object)
2232 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_STREAMOFF,
2233 &(v4l2object->type)) < 0) {
2234 GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ,
2235 (_("Error stopping streaming on device '%s'."), v4l2object->videodev),