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gstreamer/sys/v4l2/v4l2_calls.c
Tim-Philipp Müller 2baa107562 v4l2: printf format string fix 
The compiler wants a cast here even though the type is already
typedefed as 64-bit integer (presumably because glib has typedefed
guint64 to unsigned long here).
2010-02-15 12:13:43 +00:00

855 lines
25 KiB
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/* GStreamer
*
* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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 "v4l2_calls.h"
#include "gstv4l2tuner.h"
#if 0
#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"
#include "gstv4l2src.h"
#include "gstv4l2sink.h"
#include "gst/gst-i18n-plugin.h"
/* Those are ioctl calls */
#ifndef V4L2_CID_HCENTER
#define V4L2_CID_HCENTER V4L2_CID_HCENTER_DEPRECATED
#endif
#ifndef V4L2_CID_VCENTER
#define V4L2_CID_VCENTER V4L2_CID_VCENTER_DEPRECATED
#endif
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
******************************************************/
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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
goto cap_failed;
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, "capabilites: %08x", v4l2object->vcap.capabilities);
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;
}
}
/******************************************************
* 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;
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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
if (errno == EINVAL)
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: %016x", (guint) 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 (v4l2_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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
if (errno == EINVAL || errno == ENOTTY)
break; /* end of enumeration */
else {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed to query norm on device '%s'."),
v4l2object->videodev),
("Failed to get attributes for norm %d on devide '%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;
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) */
for (n = V4L2_CID_BASE;; n++) {
struct v4l2_queryctrl control = { 0, };
GstV4l2ColorBalanceChannel *v4l2channel;
GstColorBalanceChannel *channel;
/* 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;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
if (errno == EINVAL) {
if (n < V4L2_CID_PRIVATE_BASE) {
GST_DEBUG_OBJECT (e, "skipping control %08x", n);
/* continue so that we also check private controls */
continue;
} else {
GST_DEBUG_OBJECT (e, "controls finished");
break;
}
} else {
GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
(_("Failed getting controls attributes on device '%s'."),
v4l2object->videodev),
("Failed querying control %d on device '%s'. (%d - %s)",
n, v4l2object->videodev, errno, strerror (errno)));
return FALSE;
}
}
if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
GST_DEBUG_OBJECT (e, "skipping disabled control");
continue;
}
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:
#ifdef V4L2_CID_SHARPNESS
case V4L2_CID_SHARPNESS:
#endif
/* we only handle these for now (why?) */
break;
case V4L2_CID_HFLIP:
case V4L2_CID_VFLIP:
case V4L2_CID_HCENTER:
case V4L2_CID_VCENTER:
#ifdef V4L2_CID_PAN_RESET
case V4L2_CID_PAN_RESET:
#endif
#ifdef V4L2_CID_TILT_RESET
case V4L2_CID_TILT_RESET:
#endif
/* 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 */
/* fall through */
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 (v4l2_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->element, "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;
}
/******************************************************
* gst_v4l2_open():
* open the video device (v4l2object->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_open (GstV4l2Object * v4l2object)
{
struct stat st;
int libv4l2_fd;
GstPollFD pollfd = GST_POLL_FD_INIT;
GST_DEBUG_OBJECT (v4l2object->element, "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;
libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
V4L2_ENABLE_ENUM_FMT_EMULATION);
/* 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;
v4l2object->can_poll_device = TRUE;
/* 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->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
goto not_capture;
if (GST_IS_V4L2SINK (v4l2object->element) &&
!(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
goto not_output;
/* create enumerations, posts errors. */
if (!gst_v4l2_fill_lists (v4l2object))
goto error;
GST_INFO_OBJECT (v4l2object->element,
"Opened device '%s' (%s) successfully",
v4l2object->vcap.card, v4l2object->videodev);
pollfd.fd = v4l2object->video_fd;
gst_poll_add_fd (v4l2object->poll, &pollfd);
gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
return TRUE;
/* ERRORS */
stat_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
no_device:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("This isn't a device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
not_open:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device '%s' for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
goto error;
}
not_capture:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a capture device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
not_output:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a output device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
error:
{
if (GST_V4L2_IS_OPEN (v4l2object)) {
/* close device */
v4l2_close (v4l2object->video_fd);
v4l2object->video_fd = -1;
}
/* empty lists */
gst_v4l2_empty_lists (v4l2object);
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)
{
GstPollFD pollfd = GST_POLL_FD_INIT;
GST_DEBUG_OBJECT (v4l2object->element, "Trying to close %s",
v4l2object->videodev);
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* close device */
v4l2_close (v4l2object->video_fd);
pollfd.fd = v4l2object->video_fd;
gst_poll_remove_fd (v4l2object->poll, &pollfd);
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->element, "getting norm");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_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->element, "trying to set norm to "
"%" G_GINT64_MODIFIER "x", (guint64) norm);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_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->element, "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 (v4l2_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->element,
"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 */
v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
freq.frequency = frequency / channel->freq_multiplicator;
if (v4l2_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->element, "trying to get signal strength");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
tuner.index = tunernum;
if (v4l2_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->element, "getting value of attribute %d",
attribute_num);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
control.id = attribute_num;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
goto ctrl_failed;
*value = control.value;
return TRUE;
/* ERRORS */
ctrl_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to get value for control %d on device '%s'."),
attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
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->element, "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 (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
goto ctrl_failed;
return TRUE;
/* ERRORS */
ctrl_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set value %d for control %d on device '%s'."),
value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
gboolean
gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
{
gint n;
GST_DEBUG_OBJECT (v4l2object->element, "trying to get input");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
goto input_failed;
*input = n;
GST_DEBUG_OBJECT (v4l2object->element, "input: %d", n);
return TRUE;
/* ERRORS */
input_failed:
{
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->element, "trying to set input to %d", input);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
goto input_failed;
return TRUE;
/* ERRORS */
input_failed:
{
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
(_("Failed to set input %d on device %s."),
input, v4l2object->videodev), GST_ERROR_SYSTEM);
return FALSE;
}
}
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