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gstreamer/sys/v4l2/v4l2_calls.c
Julien Isorce 61ae84b50d v4l2: add support for multi-planar V4L2 API 
This api is in linux kernel since version 2.6.39,
and present in all version 3.

The commit that adds the API in master branch of the
linux kernel source is:
f8f3914cf9

v4l2 doc: "Some devices require data for each input
or output video frame to be placed in discontiguous
memory buffers"

There are newer structures 'struct v4l2_pix_format_mplane'
and 'struct v4l2_plane'.
So the pixel format is not setup with the same API when using
multi-planar.

Also for gst-v4l2, one of the difference is that in GstV4l2Meta
there are now one mem pointer for each maped plane.

When not using multi-planar, this commit takes care of keeping
the same code path than previously. So that the 2 cases are
in two different blocks triggered from V4L2_TYPE_IS_MULTIPLANAR.

Fixes bug https://bugzilla.gnome.org/show_bug.cgi?id=712754
2013-12-04 09:27:20 +00:00

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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., 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 "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, 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 (v4l2_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 (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 || errno == ENODATA)
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;
GST_DEBUG_OBJECT (v4l2object->element, "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) */
#ifdef V4L2_CTRL_FLAG_NEXT_CTRL
next = V4L2_CTRL_FLAG_NEXT_CTRL;
n = 0;
#else
next = 0;
n = V4L2_CID_BASE;
#endif
control.id = next;
while (TRUE) {
GstV4l2ColorBalanceChannel *v4l2channel;
GstColorBalanceChannel *channel;
if (!next)
n++;
/* 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 (v4l2_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;
continue;
}
}
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 */
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;
}
}
n = control.id;
if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
GST_DEBUG_OBJECT (e, "skipping disabled control");
continue;
}
#ifdef V4L2_CTRL_TYPE_CTRL_CLASS
if (control.type == V4L2_CTRL_TYPE_CTRL_CLASS) {
GST_DEBUG_OBJECT (e, "starting control class '%s'", control.name);
continue;
}
#endif
switch (control.type) {
case V4L2_CTRL_TYPE_INTEGER:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_MENU:
#ifdef V4L2_CTRL_TYPE_INTEGER_MENU
case V4L2_CTRL_TYPE_INTEGER_MENU:
#endif
#ifdef V4L2_CTRL_TYPE_BITMASK
case V4L2_CTRL_TYPE_BITMASK:
#endif
case V4L2_CTRL_TYPE_BUTTON:{
int i;
control.name[31] = '\0';
for (i = 0; control.name[i]; ++i) {
control.name[i] = g_ascii_tolower (control.name[i]);
if (!g_ascii_isalnum (control.name[i]))
control.name[i] = '_';
}
GST_INFO_OBJECT (e, "adding generic controls '%s'", 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:
#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:
#ifndef V4L2_CID_PAN_RESET
case V4L2_CID_HCENTER:
#endif
#ifndef V4L2_CID_TILT_RESET
case V4L2_CID_VCENTER:
#endif
#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;
g_datalist_clear (&v4l2object->controls);
}
/******************************************************
* 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 |
V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
goto not_capture;
if (GST_IS_V4L2SINK (v4l2object->element) &&
!(v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
goto not_output;
/* 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->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT_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->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) {
/* FIXME: for now it's an untested case so just put a warning */
GST_WARNING ("untested V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE");
GST_DEBUG ("adjust type to multi-planar capture");
v4l2object->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
}
break;
default:
break;
}
/* 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);
if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE
|| v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
else
gst_poll_fd_ctl_write (v4l2object->poll, &pollfd, TRUE);
if (v4l2object->extra_controls)
gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
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;
}
}
static gboolean
set_contol (GQuark field_id, const GValue * value, gpointer user_data)
{
GstV4l2Object *v4l2object = user_data;
gpointer *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_contol, v4l2object);
}
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:
if (v4l2object->vcap.capabilities & 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->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:
if (v4l2object->vcap.capabilities & 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->element, "trying to get output");
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
goto output_failed;
*output = n;
GST_DEBUG_OBJECT (v4l2object->element, "output: %d", n);
return TRUE;
/* ERRORS */
output_failed:
if (v4l2object->vcap.capabilities & 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->element, "trying to set output to %d", output);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
goto output_failed;
return TRUE;
/* ERRORS */
output_failed:
if (v4l2object->vcap.capabilities & 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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