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gstreamer/sys/v4l2/v4l2_calls.c
Víctor Manuel Jáquez Leal 078560e70a v4l2: use GstV4l2Error in gst_v4l2_open() 
gst_v4l2_open() is called by gst_v4l2_device_provider_probe_device(),
where the GstV4l2Object is created without an associated GstElement.

If gst_v4l2_open() fails, it raises a bus message, but without an
element, a precondition check fails on
gst_element_message_full_with_details() generating a crash if running
with fatal-warnings debug mode.

GstV4l2Error is a helper to raise error bus messages when it is
appropiated. This patch changes the direct bus messages to this
helper, and the elements will actually send the error message.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/694>
2020-08-11 01:44:17 +00:00

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/* GStreamer
*
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@gmail.com>
*
* v4l2_calls.c - generic V4L2 calls handling
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef __sun
/* Needed on older Solaris Nevada builds (72 at least) */
#include <stropts.h>
#include <sys/ioccom.h>
#endif
#include "gstv4l2object.h"
#include "gstv4l2tuner.h"
#include "gstv4l2colorbalance.h"
#include "gstv4l2src.h"
#include "gstv4l2sink.h"
#include "gstv4l2videodec.h"
#include "gst/gst-i18n-plugin.h"
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug
/******************************************************
* gst_v4l2_get_capabilities():
* get the device's capturing capabilities
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
{
GstElement *e;
e = v4l2object->element;
GST_DEBUG_OBJECT (e, "getting capabilities");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP,
&v4l2object->vcap) < 0)
goto cap_failed;
if (v4l2object->vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
v4l2object->device_caps = v4l2object->vcap.device_caps;
else
v4l2object->device_caps = v4l2object->vcap.capabilities;
GST_LOG_OBJECT (e, "driver: '%s'", v4l2object->vcap.driver);
GST_LOG_OBJECT (e, "card: '%s'", v4l2object->vcap.card);
GST_LOG_OBJECT (e, "bus_info: '%s'", v4l2object->vcap.bus_info);
GST_LOG_OBJECT (e, "version: %08x", v4l2object->vcap.version);
GST_LOG_OBJECT (e, "capabilities: %08x", v4l2object->device_caps);
return TRUE;
/* ERRORS */
cap_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Error getting capabilities for device '%s': "
"It isn't a v4l2 driver. Check if it is a v4l1 driver."),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* The video4linux command line tool v4l2-ctrl
* normalises the names of the controls received from
* the kernel like:
*
* "Exposure (absolute)" -> "exposure_absolute"
*
* We follow their lead here. @name is modified
* in-place.
******************************************************/
static void
gst_v4l2_normalise_control_name (gchar * name)
{
int i, j;
for (i = 0, j = 0; name[j]; ++j) {
if (g_ascii_isalnum (name[j])) {
if (i > 0 && !g_ascii_isalnum (name[j - 1]))
name[i++] = '_';
name[i++] = g_ascii_tolower (name[j]);
}
}
name[i++] = '\0';
}
/******************************************************
* gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
* fill/empty the lists of enumerations
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
{
gint n, next;
struct v4l2_queryctrl control = { 0, };
GstElement *e;
e = v4l2object->element;
GST_DEBUG_OBJECT (e, "getting enumerations");
GST_V4L2_CHECK_OPEN (v4l2object);
GST_DEBUG_OBJECT (e, " channels");
/* and now, the channels */
for (n = 0;; n++) {
struct v4l2_input input;
GstV4l2TunerChannel *v4l2channel;
GstTunerChannel *channel;
memset (&input, 0, sizeof (input));
input.index = n;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
if (errno == EINVAL || errno == ENOTTY)
break; /* end of enumeration */
else {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed to query attributes of input %d in device %s"),
n, v4l2object->videodev),
("Failed to get %d in input enumeration for %s. (%d - %s)",
n, v4l2object->videodev, errno, strerror (errno)));
return FALSE;
}
}
GST_LOG_OBJECT (e, " index: %d", input.index);
GST_LOG_OBJECT (e, " name: '%s'", input.name);
GST_LOG_OBJECT (e, " type: %08x", input.type);
GST_LOG_OBJECT (e, " audioset: %08x", input.audioset);
GST_LOG_OBJECT (e, " std: %016" G_GINT64_MODIFIER "x",
(guint64) input.std);
GST_LOG_OBJECT (e, " status: %08x", input.status);
v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
channel = GST_TUNER_CHANNEL (v4l2channel);
channel->label = g_strdup ((const gchar *) input.name);
channel->flags = GST_TUNER_CHANNEL_INPUT;
v4l2channel->index = n;
if (input.type == V4L2_INPUT_TYPE_TUNER) {
struct v4l2_tuner vtun;
v4l2channel->tuner = input.tuner;
channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
vtun.index = input.tuner;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed to get setting of tuner %d on device '%s'."),
input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
g_object_unref (G_OBJECT (channel));
return FALSE;
}
channel->freq_multiplicator =
62.5 * ((vtun.capability & V4L2_TUNER_CAP_LOW) ? 1 : 1000);
channel->min_frequency = vtun.rangelow * channel->freq_multiplicator;
channel->max_frequency = vtun.rangehigh * channel->freq_multiplicator;
channel->min_signal = 0;
channel->max_signal = 0xffff;
}
if (input.audioset) {
/* we take the first. We don't care for
* the others for now */
while (!(input.audioset & (1 << v4l2channel->audio)))
v4l2channel->audio++;
channel->flags |= GST_TUNER_CHANNEL_AUDIO;
}
v4l2object->channels =
g_list_prepend (v4l2object->channels, (gpointer) channel);
}
v4l2object->channels = g_list_reverse (v4l2object->channels);
GST_DEBUG_OBJECT (e, " norms");
/* norms... */
for (n = 0;; n++) {
struct v4l2_standard standard = { 0, };
GstV4l2TunerNorm *v4l2norm;
GstTunerNorm *norm;
/* fill in defaults */
standard.frameperiod.numerator = 1;
standard.frameperiod.denominator = 0;
standard.index = n;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
if (errno == EINVAL || errno == ENOTTY)
break; /* end of enumeration */
#ifdef ENODATA
else if (errno == ENODATA)
break; /* end of enumeration, as of Linux 3.7-rc1 */
#endif
else {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed to query norm on device '%s'."),
v4l2object->videodev),
("Failed to get attributes for norm %d on divide '%s'. (%d - %s)",
n, v4l2object->videodev, errno, strerror (errno)));
return FALSE;
}
}
GST_DEBUG_OBJECT (e, " '%s', fps: %d / %d",
standard.name, standard.frameperiod.denominator,
standard.frameperiod.numerator);
v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
norm = GST_TUNER_NORM (v4l2norm);
norm->label = g_strdup ((const gchar *) standard.name);
gst_value_set_fraction (&norm->framerate,
standard.frameperiod.denominator, standard.frameperiod.numerator);
v4l2norm->index = standard.id;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "index=%08x, label=%s",
(unsigned int) v4l2norm->index, norm->label);
v4l2object->norms = g_list_prepend (v4l2object->norms, (gpointer) norm);
}
v4l2object->norms = g_list_reverse (v4l2object->norms);
GST_DEBUG_OBJECT (e, " controls+menus");
/* and lastly, controls+menus (if appropriate) */
next = V4L2_CTRL_FLAG_NEXT_CTRL;
n = 0;
control.id = next;
while (TRUE) {
GstV4l2ColorBalanceChannel *v4l2channel;
GstColorBalanceChannel *channel;
if (!next)
n++;
retry:
/* when we reached the last official CID, continue with private CIDs */
if (n == V4L2_CID_LASTP1) {
GST_DEBUG_OBJECT (e, "checking private CIDs");
n = V4L2_CID_PRIVATE_BASE;
}
GST_DEBUG_OBJECT (e, "checking control %08x", n);
control.id = n | next;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL,
&control) < 0) {
if (next) {
if (n > 0) {
GST_DEBUG_OBJECT (e, "controls finished");
break;
} else {
GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
next = 0;
n = V4L2_CID_BASE;
goto retry;
}
}
if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
if (n < V4L2_CID_PRIVATE_BASE) {
GST_DEBUG_OBJECT (e, "skipping control %08x", n);
/* continue so that we also check private controls */
n = V4L2_CID_PRIVATE_BASE - 1;
continue;
} else {
GST_DEBUG_OBJECT (e, "controls finished");
break;
}
} else {
GST_WARNING_OBJECT (e, "Failed querying control %d on device '%s'. "
"(%d - %s)", n, v4l2object->videodev, errno, strerror (errno));
continue;
}
}
/* bogus driver might mess with id in unexpected ways (e.g. set to 0), so
* make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */
if (next)
n = control.id;
if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
GST_DEBUG_OBJECT (e, "skipping disabled control");
continue;
}
if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
continue;
}
switch (control.type) {
case V4L2_CTRL_TYPE_INTEGER:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_MENU:
case V4L2_CTRL_TYPE_INTEGER_MENU:
case V4L2_CTRL_TYPE_BITMASK:
case V4L2_CTRL_TYPE_BUTTON:
case V4L2_CTRL_TYPE_STRING:{
control.name[31] = '\0';
gst_v4l2_normalise_control_name ((gchar *) control.name);
g_datalist_id_set_data (&v4l2object->controls,
g_quark_from_string ((const gchar *) control.name),
GINT_TO_POINTER (n));
break;
}
default:
GST_DEBUG_OBJECT (e,
"Control type for '%s' not supported for extra controls.",
control.name);
break;
}
switch (n) {
case V4L2_CID_BRIGHTNESS:
case V4L2_CID_CONTRAST:
case V4L2_CID_SATURATION:
case V4L2_CID_HUE:
case V4L2_CID_BLACK_LEVEL:
case V4L2_CID_AUTO_WHITE_BALANCE:
case V4L2_CID_DO_WHITE_BALANCE:
case V4L2_CID_RED_BALANCE:
case V4L2_CID_BLUE_BALANCE:
case V4L2_CID_GAMMA:
case V4L2_CID_EXPOSURE:
case V4L2_CID_AUTOGAIN:
case V4L2_CID_GAIN:
case V4L2_CID_SHARPNESS:
/* we only handle these for now (why?) */
break;
case V4L2_CID_HFLIP:
case V4L2_CID_VFLIP:
case V4L2_CID_PAN_RESET:
case V4L2_CID_TILT_RESET:
/* not handled here, handled by VideoOrientation interface */
control.id++;
break;
case V4L2_CID_AUDIO_VOLUME:
case V4L2_CID_AUDIO_BALANCE:
case V4L2_CID_AUDIO_BASS:
case V4L2_CID_AUDIO_TREBLE:
case V4L2_CID_AUDIO_MUTE:
case V4L2_CID_AUDIO_LOUDNESS:
/* FIXME: We should implement GstMixer interface instead */
/* but let's not be pedantic and make element more useful for now */
break;
case V4L2_CID_ALPHA_COMPONENT:
v4l2object->has_alpha_component = TRUE;
break;
default:
GST_DEBUG_OBJECT (e,
"ControlID %s (%x) unhandled, FIXME", control.name, n);
control.id++;
break;
}
if (n != control.id)
continue;
GST_DEBUG_OBJECT (e, "Adding ControlID %s (%x)", control.name, n);
v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
channel->label = g_strdup ((const gchar *) control.name);
v4l2channel->id = n;
#if 0
/* FIXME: it will be need just when handling private controls
*(currently none of base controls are of this type) */
if (control.type == V4L2_CTRL_TYPE_MENU) {
struct v4l2_querymenu menu, *mptr;
int i;
menu.id = n;
for (i = 0;; i++) {
menu.index = i;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU,
&menu) < 0) {
if (errno == EINVAL)
break; /* end of enumeration */
else {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed getting controls attributes on device '%s'."),
v4l2object->videodev),
("Failed to get %d in menu enumeration for %s. (%d - %s)",
n, v4l2object->videodev, errno, strerror (errno)));
return FALSE;
}
}
mptr = g_malloc (sizeof (menu));
memcpy (mptr, &menu, sizeof (menu));
menus = g_list_append (menus, mptr);
}
}
v4l2object->menus = g_list_append (v4l2object->menus, menus);
#endif
switch (control.type) {
case V4L2_CTRL_TYPE_INTEGER:
channel->min_value = control.minimum;
channel->max_value = control.maximum;
break;
case V4L2_CTRL_TYPE_BOOLEAN:
channel->min_value = FALSE;
channel->max_value = TRUE;
break;
default:
/* FIXME we should find out how to handle V4L2_CTRL_TYPE_BUTTON.
BUTTON controls like V4L2_CID_DO_WHITE_BALANCE can just be set (1) or
unset (0), but can't be queried */
GST_DEBUG_OBJECT (e,
"Control with non supported type %s (%x), type=%d",
control.name, n, control.type);
channel->min_value = channel->max_value = 0;
break;
}
v4l2object->colors =
g_list_prepend (v4l2object->colors, (gpointer) channel);
}
v4l2object->colors = g_list_reverse (v4l2object->colors);
GST_DEBUG_OBJECT (e, "done");
return TRUE;
}
static void
gst_v4l2_empty_lists (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "deleting enumerations");
g_list_foreach (v4l2object->channels, (GFunc) g_object_unref, NULL);
g_list_free (v4l2object->channels);
v4l2object->channels = NULL;
g_list_foreach (v4l2object->norms, (GFunc) g_object_unref, NULL);
g_list_free (v4l2object->norms);
v4l2object->norms = NULL;
g_list_foreach (v4l2object->colors, (GFunc) g_object_unref, NULL);
g_list_free (v4l2object->colors);
v4l2object->colors = NULL;
g_datalist_clear (&v4l2object->controls);
}
static void
gst_v4l2_adjust_buf_type (GstV4l2Object * v4l2object)
{
/* when calling gst_v4l2_object_new the user decides the initial type
* so adjust it if multi-planar is supported
* the driver should make it exclusive. So the driver should
* not support both MPLANE and non-PLANE.
* Because even when using MPLANE it still possibles to use it
* in a contiguous manner. In this case the first v4l2 plane
* contains all the gst planes.
*/
switch (v4l2object->type) {
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (v4l2object->device_caps &
(V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) {
GST_DEBUG ("adjust type to multi-planar output");
v4l2object->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
}
break;
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (v4l2object->device_caps &
(V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_M2M_MPLANE)) {
GST_DEBUG ("adjust type to multi-planar capture");
v4l2object->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
}
break;
default:
break;
}
}
/******************************************************
* gst_v4l2_open():
* open the video device (v4l2object->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_open (GstV4l2Object * v4l2object, GstV4l2Error * error)
{
struct stat st;
int libv4l2_fd = -1;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to open device %s",
v4l2object->videodev);
GST_V4L2_CHECK_NOT_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* be sure we have a device */
if (!v4l2object->videodev)
v4l2object->videodev = g_strdup ("/dev/video");
/* check if it is a device */
if (stat (v4l2object->videodev, &st) == -1)
goto stat_failed;
if (!S_ISCHR (st.st_mode))
goto no_device;
/* open the device */
v4l2object->video_fd =
open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
if (!GST_V4L2_IS_OPEN (v4l2object))
goto not_open;
#ifdef HAVE_LIBV4L2
if (v4l2object->fd_open)
libv4l2_fd = v4l2object->fd_open (v4l2object->video_fd,
V4L2_ENABLE_ENUM_FMT_EMULATION);
#endif
/* Note the v4l2_xxx functions are designed so that if they get passed an
unknown fd, the will behave exactly as their regular xxx counterparts, so
if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
cam format to normal formats conversion). Chances are big we will still
fail then though, as normally v4l2_fd_open only fails if the device is not
a v4l2 device. */
if (libv4l2_fd != -1)
v4l2object->video_fd = libv4l2_fd;
/* get capabilities, error will be posted */
if (!gst_v4l2_get_capabilities (v4l2object))
goto error;
/* do we need to be a capture device? */
if (GST_IS_V4L2SRC (v4l2object->element) &&
!(v4l2object->device_caps & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
goto not_capture;
if (GST_IS_V4L2SINK (v4l2object->element) &&
!(v4l2object->device_caps & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
goto not_output;
if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
!GST_V4L2_IS_M2M (v4l2object->device_caps))
goto not_m2m;
gst_v4l2_adjust_buf_type (v4l2object);
/* create enumerations, posts errors. */
if (!gst_v4l2_fill_lists (v4l2object))
goto error;
GST_INFO_OBJECT (v4l2object->dbg_obj,
"Opened device '%s' (%s) successfully",
v4l2object->vcap.card, v4l2object->videodev);
if (v4l2object->extra_controls)
gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
/* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
* causes expensive and slow USB IO, so don't probe them for interlaced
*/
if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb") ||
!strcmp ((char *) v4l2object->vcap.driver, "uvcvideo")) {
v4l2object->never_interlaced = TRUE;
}
return TRUE;
/* ERRORS */
stat_failed:
{
GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
no_device:
{
GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND,
(_("This isn't a device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
not_open:
{
GST_V4L2_ERROR (error, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device '%s' for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
goto error;
}
not_capture:
{
GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a capture device."), v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->device_caps));
goto error;
}
not_output:
{
GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a output device."), v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->device_caps));
goto error;
}
not_m2m:
{
GST_V4L2_ERROR (error, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a M2M device."), v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->device_caps));
goto error;
}
error:
{
if (GST_V4L2_IS_OPEN (v4l2object)) {
/* close device */
v4l2object->close (v4l2object->video_fd);
v4l2object->video_fd = -1;
}
/* empty lists */
gst_v4l2_empty_lists (v4l2object);
return FALSE;
}
}
gboolean
gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to dup device %s",
other->videodev);
GST_V4L2_CHECK_OPEN (other);
GST_V4L2_CHECK_NOT_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (other);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
v4l2object->vcap = other->vcap;
v4l2object->device_caps = other->device_caps;
gst_v4l2_adjust_buf_type (v4l2object);
v4l2object->video_fd = v4l2object->dup (other->video_fd);
if (!GST_V4L2_IS_OPEN (v4l2object))
goto not_open;
g_free (v4l2object->videodev);
v4l2object->videodev = g_strdup (other->videodev);
GST_INFO_OBJECT (v4l2object->dbg_obj,
"Cloned device '%s' (%s) successfully",
v4l2object->vcap.card, v4l2object->videodev);
v4l2object->never_interlaced = other->never_interlaced;
v4l2object->no_initial_format = other->no_initial_format;
return TRUE;
not_open:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
(_("Could not dup device '%s' for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2_close():
* close the video device (v4l2object->video_fd)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_close (GstV4l2Object * v4l2object)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Trying to close %s",
v4l2object->videodev);
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* close device */
v4l2object->close (v4l2object->video_fd);
v4l2object->video_fd = -1;
/* empty lists */
gst_v4l2_empty_lists (v4l2object);
return TRUE;
}
/******************************************************
* gst_v4l2_get_norm()
* Get the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting norm");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
goto std_failed;
return TRUE;
/* ERRORS */
std_failed:
{
GST_DEBUG ("Failed to get the current norm for device %s",
v4l2object->videodev);
return FALSE;
}
}
/******************************************************
* gst_v4l2_set_norm()
* Set the norm of the current device
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set norm to "
"%" G_GINT64_MODIFIER "x", (guint64) norm);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
goto std_failed;
return TRUE;
/* ERRORS */
std_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set norm for device '%s'."),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2_get_frequency():
* get the current frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
gint tunernum, gulong * frequency)
{
struct v4l2_frequency freq = { 0, };
GstTunerChannel *channel;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting current tuner frequency");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
freq.tuner = tunernum;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
goto freq_failed;
*frequency = freq.frequency * channel->freq_multiplicator;
return TRUE;
/* ERRORS */
freq_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get current tuner frequency for device '%s'."),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2_set_frequency():
* set frequency
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
gint tunernum, gulong frequency)
{
struct v4l2_frequency freq = { 0, };
GstTunerChannel *channel;
GST_DEBUG_OBJECT (v4l2object->dbg_obj,
"setting current tuner frequency to %lu", frequency);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
freq.tuner = tunernum;
/* fill in type - ignore error */
(void) v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
freq.frequency = frequency / channel->freq_multiplicator;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
goto freq_failed;
return TRUE;
/* ERRORS */
freq_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set current tuner frequency for device '%s' to %lu Hz."),
v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2_signal_strength():
* get the strength of the signal on the current input
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
gint tunernum, gulong * signal_strength)
{
struct v4l2_tuner tuner = { 0, };
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get signal strength");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
tuner.index = tunernum;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
goto tuner_failed;
*signal_strength = tuner.signal;
return TRUE;
/* ERRORS */
tuner_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get signal strength for device '%s'."),
v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
/******************************************************
* gst_v4l2_get_attribute():
* try to get the value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
int attribute_num, int *value)
{
struct v4l2_control control = { 0, };
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "getting value of attribute %d",
attribute_num);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
control.id = attribute_num;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
goto ctrl_failed;
*value = control.value;
return TRUE;
/* ERRORS */
ctrl_failed:
{
GST_WARNING_OBJECT (v4l2object,
_("Failed to get value for control %d on device '%s'."),
attribute_num, v4l2object->videodev);
return FALSE;
}
}
/******************************************************
* gst_v4l2_set_attribute():
* try to set the value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
int attribute_num, const int value)
{
struct v4l2_control control = { 0, };
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "setting value of attribute %d to %d",
attribute_num, value);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
control.id = attribute_num;
control.value = value;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
goto ctrl_failed;
return TRUE;
/* ERRORS */
ctrl_failed:
{
GST_WARNING_OBJECT (v4l2object,
_("Failed to set value %d for control %d on device '%s'."),
value, attribute_num, v4l2object->videodev);
return FALSE;
}
}
/******************************************************
* gst_v4l2_set_string_attribute():
* try to set the string value of one specific attribute
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_string_attribute (GstV4l2Object * v4l2object,
int attribute_num, const char *value)
{
struct v4l2_ext_controls ctrls = { {0}, 1 };
struct v4l2_ext_control ctrl;
struct v4l2_queryctrl control = { 0, };
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
control.id = attribute_num;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
GST_WARNING_OBJECT (v4l2object,
"Failed to find control %d on device '%s'.",
attribute_num, v4l2object->videodev);
return TRUE;
}
if (control.type != V4L2_CTRL_TYPE_STRING) {
GST_WARNING_OBJECT (v4l2object,
"control %d is not string type on device '%s'.",
attribute_num, v4l2object->videodev);
return TRUE;
}
ctrl.id = attribute_num;
ctrl.size = strlen (value) + 1;
ctrl.string = g_malloc (ctrl.size);
strcpy (ctrl.string, value);
ctrls.which = V4L2_CTRL_ID2WHICH (attribute_num);
ctrls.count = 1;
ctrls.controls = &ctrl;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "setting value of attribute %d to %s",
attribute_num, value);
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0)
goto ctrl_failed;
g_free (ctrl.string);
return TRUE;
/* ERRORS */
ctrl_failed:
{
GST_WARNING_OBJECT (v4l2object,
_("Failed to set value %s for control %d on device '%s'."),
value, attribute_num, v4l2object->videodev);
g_free (ctrl.string);
return FALSE;
}
}
static gboolean
set_control (GQuark field_id, const GValue * value, gpointer user_data)
{
GstV4l2Object *v4l2object = user_data;
GQuark normalised_field_id;
gpointer *d;
/* 32 bytes is the maximum size for a control name according to v4l2 */
gchar name[32];
/* Backwards compatibility: in the past GStreamer would normalise strings in
a subtly different way to v4l2-ctl. e.g. the kernel's "Focus (absolute)"
would become "focus__absolute_" whereas now it becomes "focus_absolute".
Please remove the following in GStreamer 1.5 for 1.6 */
strncpy (name, g_quark_to_string (field_id), sizeof (name));
name[31] = '\0';
gst_v4l2_normalise_control_name (name);
normalised_field_id = g_quark_from_string (name);
if (normalised_field_id != field_id)
g_warning ("In GStreamer 1.4 the way V4L2 control names were normalised "
"changed. Instead of setting \"%s\" please use \"%s\". The former is "
"deprecated and will be removed in a future version of GStreamer",
g_quark_to_string (field_id), name);
field_id = normalised_field_id;
d = g_datalist_id_get_data (&v4l2object->controls, field_id);
if (!d) {
GST_WARNING_OBJECT (v4l2object,
"Control '%s' does not exist or has an unsupported type.",
g_quark_to_string (field_id));
return TRUE;
}
if (G_VALUE_HOLDS (value, G_TYPE_INT)) {
gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
g_value_get_int (value));
} else if (G_VALUE_HOLDS (value, G_TYPE_STRING)) {
gst_v4l2_set_string_attribute (v4l2object, GPOINTER_TO_INT (d),
g_value_get_string (value));
} else {
GST_WARNING_OBJECT (v4l2object,
"no compatible value expected for control '%s'.",
g_quark_to_string (field_id));
return TRUE;
}
return TRUE;
}
gboolean
gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls)
{
return gst_structure_foreach (controls, set_control, v4l2object);
}
gboolean
gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
{
gint n;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get input");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
goto input_failed;
*input = n;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "input: %d", n);
return TRUE;
/* ERRORS */
input_failed:
if (v4l2object->device_caps & V4L2_CAP_TUNER) {
/* only give a warning message if driver actually claims to have tuner
* support
*/
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get current input on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
}
return FALSE;
}
gboolean
gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set input to %d", input);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
goto input_failed;
return TRUE;
/* ERRORS */
input_failed:
if (v4l2object->device_caps & V4L2_CAP_TUNER) {
/* only give a warning message if driver actually claims to have tuner
* support
*/
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set input %d on device %s."),
input, v4l2object->videodev), GST_ERROR_SYSTEM);
}
return FALSE;
}
gboolean
gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
{
gint n;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to get output");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
goto output_failed;
*output = n;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "output: %d", n);
return TRUE;
/* ERRORS */
output_failed:
if (v4l2object->device_caps & V4L2_CAP_TUNER) {
/* only give a warning message if driver actually claims to have tuner
* support
*/
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get current output on device '%s'. May be it is a radio device"), v4l2object->videodev), GST_ERROR_SYSTEM);
}
return FALSE;
}
gboolean
gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
{
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "trying to set output to %d", output);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
goto output_failed;
return TRUE;
/* ERRORS */
output_failed:
if (v4l2object->device_caps & V4L2_CAP_TUNER) {
/* only give a warning message if driver actually claims to have tuner
* support
*/
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set output %d on device %s."),
output, v4l2object->videodev), GST_ERROR_SYSTEM);
}
return FALSE;
}
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