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gstreamer/sys/v4l2/v4l2_calls.c
Nicolas Dufresne e575e4eda8 v4l2object: Use a debug object for tracing 
This way we can pass the pad name instead of the element for tracing
which helps identifying which v4l2object is used withing M2M element
like decoder, encoder and transform. For the reference, pads are name
<parent-name>:<pad-name>.
2017-12-13 14:42:25 -05:00

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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, "capabilites: %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 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;
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:{
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 suppored 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)
{
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) &&
/* Today's M2M device only expose M2M */
!((v4l2object->device_caps & (V4L2_CAP_VIDEO_M2M |
V4L2_CAP_VIDEO_M2M_MPLANE)) ||
/* But legacy driver may expose both CAPTURE and OUTPUT */
((v4l2object->device_caps &
(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
(v4l2object->device_caps &
(V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
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_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->device_caps));
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->device_caps));
goto error;
}
not_m2m:
{
GST_ELEMENT_ERROR (v4l2object->element, 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;
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;
}
}
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_WARNING_OBJECT (v4l2object,
"'int' value expected for control '%s'.", g_quark_to_string (field_id));
return TRUE;
}
gst_v4l2_set_attribute (v4l2object, GPOINTER_TO_INT (d),
g_value_get_int (value));
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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