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6cc1c73d2b
Original commit message from CVS: don't mix tabs and spaces
760 lines
22 KiB
C
760 lines
22 KiB
C
/* G-Streamer generic V4L2 element - generic V4L2 calls handling
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* Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "v4l2_calls.h"
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#include "gstv4l2tuner.h"
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#include "gstv4l2xoverlay.h"
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#include "gstv4l2colorbalance.h"
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#include "gstv4l2src.h"
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#define DEBUG(format, args...) \
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GST_DEBUG_OBJECT (\
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GST_ELEMENT(v4l2element), \
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"V4L2: " format, ##args)
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/******************************************************
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* gst_v4l2_get_capabilities():
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* get the device's capturing capabilities
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* return value: TRUE on success, FALSE on error
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******************************************************/
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static gboolean
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gst_v4l2_get_capabilities (GstV4l2Element * v4l2element)
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{
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DEBUG ("getting capabilities");
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GST_V4L2_CHECK_OPEN (v4l2element);
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if (ioctl (v4l2element->video_fd, VIDIOC_QUERYCAP, &(v4l2element->vcap)) < 0) {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Error getting %s capabilities: %s",
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v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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return TRUE;
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}
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/******************************************************
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* gst_v4l2_empty_lists() and gst_v4l2_fill_lists():
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* fill/empty the lists of enumerations
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* return value: TRUE on success, FALSE on error
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******************************************************/
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static gboolean
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gst_v4l2_fill_lists (GstV4l2Element * v4l2element)
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{
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gint n;
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const GList *pads = gst_element_get_pad_list (GST_ELEMENT (v4l2element));
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GstPadDirection dir = GST_PAD_UNKNOWN;
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DEBUG ("getting enumerations");
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GST_V4L2_CHECK_OPEN (v4l2element);
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/* sinks have outputs, all others have inputs */
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if (pads && g_list_length ((GList *) pads) == 1)
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dir = GST_PAD_DIRECTION (GST_PAD (pads->data));
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if (dir != GST_PAD_SINK) {
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/* and now, the inputs */
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for (n = 0;; n++) {
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struct v4l2_input input;
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GstV4l2TunerChannel *v4l2channel;
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GstTunerChannel *channel;
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input.index = n;
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if (ioctl (v4l2element->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
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if (errno == EINVAL)
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break; /* end of enumeration */
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else {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get %d in input enumeration for %s: %s",
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n, v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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}
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v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
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channel = GST_TUNER_CHANNEL (v4l2channel);
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channel->label = g_strdup (input.name);
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channel->flags = GST_TUNER_CHANNEL_INPUT;
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v4l2channel->index = n;
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if (input.type == V4L2_INPUT_TYPE_TUNER) {
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struct v4l2_tuner vtun;
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v4l2channel->tuner = input.tuner;
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channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
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vtun.index = input.tuner;
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if (ioctl (v4l2element->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get tuner %d settings on %s: %s",
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input.tuner, v4l2element->device, g_strerror (errno)));
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g_object_unref (G_OBJECT (channel));
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return FALSE;
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}
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channel->min_frequency = vtun.rangelow;
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channel->max_frequency = vtun.rangehigh;
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channel->min_signal = 0;
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channel->max_signal = 0xffff;
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}
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if (input.audioset) {
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/* we take the first. We don't care for
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* the others for now */
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while (!(input.audioset & (1 << v4l2channel->audio)))
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v4l2channel->audio++;
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channel->flags |= GST_TUNER_CHANNEL_AUDIO;
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}
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v4l2element->channels =
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g_list_append (v4l2element->channels, (gpointer) channel);
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}
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} else {
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/* outputs */
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for (n = 0;; n++) {
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struct v4l2_output output;
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GstV4l2TunerChannel *v4l2channel;
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GstTunerChannel *channel;
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output.index = n;
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if (ioctl (v4l2element->video_fd, VIDIOC_ENUMOUTPUT, &output) < 0) {
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if (errno == EINVAL)
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break; /* end of enumeration */
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else {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get %d in output enumeration for %s: %s",
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n, v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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}
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v4l2channel = g_object_new (GST_TYPE_V4L2_TUNER_CHANNEL, NULL);
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channel = GST_TUNER_CHANNEL (v4l2channel);
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channel->label = g_strdup (output.name);
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channel->flags = GST_TUNER_CHANNEL_OUTPUT;
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v4l2channel->index = n;
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if (output.audioset) {
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/* we take the first. We don't care for
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* the others for now */
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while (!(output.audioset & (1 << v4l2channel->audio)))
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v4l2channel->audio++;
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channel->flags |= GST_TUNER_CHANNEL_AUDIO;
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}
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v4l2element->channels =
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g_list_append (v4l2element->channels, (gpointer) channel);
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}
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}
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/* norms... */
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for (n = 0;; n++) {
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struct v4l2_standard standard;
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GstV4l2TunerNorm *v4l2norm;
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GstTunerNorm *norm;
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standard.index = n;
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if (ioctl (v4l2element->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
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if (errno == EINVAL)
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break; /* end of enumeration */
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else {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get %d in norm enumeration for %s: %s",
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n, v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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}
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v4l2norm = g_object_new (GST_TYPE_V4L2_TUNER_NORM, NULL);
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norm = GST_TUNER_NORM (v4l2norm);
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norm->label = g_strdup (standard.name);
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norm->fps = (gfloat) standard.frameperiod.denominator /
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standard.frameperiod.numerator;
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v4l2norm->index = standard.id;
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v4l2element->norms = g_list_append (v4l2element->norms, (gpointer) norm);
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}
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/* and lastly, controls+menus (if appropriate) */
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for (n = V4L2_CID_BASE;; n++) {
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struct v4l2_queryctrl control;
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GstV4l2ColorBalanceChannel *v4l2channel;
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GstColorBalanceChannel *channel;
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/* hacky... */
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if (n == V4L2_CID_LASTP1)
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n = V4L2_CID_PRIVATE_BASE;
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control.id = n;
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if (ioctl (v4l2element->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
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if (errno == EINVAL) {
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if (n < V4L2_CID_PRIVATE_BASE)
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continue;
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else
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break;
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} else {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get %d in control enumeration for %s: %s",
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n, v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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}
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if (control.flags & V4L2_CTRL_FLAG_DISABLED)
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continue;
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switch (n) {
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case V4L2_CID_BRIGHTNESS:
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case V4L2_CID_CONTRAST:
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case V4L2_CID_SATURATION:
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case V4L2_CID_HUE:
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case V4L2_CID_BLACK_LEVEL:
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case V4L2_CID_AUTO_WHITE_BALANCE:
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case V4L2_CID_DO_WHITE_BALANCE:
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case V4L2_CID_RED_BALANCE:
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case V4L2_CID_BLUE_BALANCE:
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case V4L2_CID_GAMMA:
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case V4L2_CID_EXPOSURE:
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case V4L2_CID_AUTOGAIN:
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case V4L2_CID_GAIN:
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/* we only handle these for now */
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break;
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default:
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DEBUG ("ControlID %s (%d) unhandled, FIXME", control.name, n);
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control.id++;
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break;
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}
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if (n != control.id)
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continue;
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v4l2channel = g_object_new (GST_TYPE_V4L2_COLOR_BALANCE_CHANNEL, NULL);
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channel = GST_COLOR_BALANCE_CHANNEL (v4l2channel);
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channel->label = g_strdup (control.name);
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v4l2channel->index = n;
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#if 0
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if (control.type == V4L2_CTRL_TYPE_MENU) {
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struct v4l2_querymenu menu, *mptr;
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int i;
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menu.id = n;
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for (i = 0;; i++) {
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menu.index = i;
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if (ioctl (v4l2element->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
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if (errno == EINVAL)
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break; /* end of enumeration */
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else {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
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("Failed to get %d in menu enumeration for %s: %s",
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n, v4l2element->device, g_strerror (errno)));
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return FALSE;
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}
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}
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mptr = g_malloc (sizeof (menu));
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memcpy (mptr, &menu, sizeof (menu));
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menus = g_list_append (menus, mptr);
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}
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}
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v4l2element->menus = g_list_append (v4l2element->menus, menus);
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#endif
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switch (control.type) {
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case V4L2_CTRL_TYPE_INTEGER:
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channel->min_value = control.minimum;
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channel->max_value = control.maximum;
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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channel->min_value = FALSE;
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channel->max_value = TRUE;
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break;
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default:
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channel->min_value = channel->max_value = 0;
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break;
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}
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v4l2element->colors = g_list_append (v4l2element->colors,
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(gpointer) channel);
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}
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return TRUE;
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}
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static void
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gst_v4l2_empty_lists (GstV4l2Element * v4l2element)
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{
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DEBUG ("deleting enumerations");
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g_list_foreach (v4l2element->channels, (GFunc) g_object_unref, NULL);
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g_list_free (v4l2element->channels);
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v4l2element->channels = NULL;
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g_list_foreach (v4l2element->norms, (GFunc) g_object_unref, NULL);
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g_list_free (v4l2element->norms);
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v4l2element->norms = NULL;
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g_list_foreach (v4l2element->colors, (GFunc) g_object_unref, NULL);
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g_list_free (v4l2element->colors);
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v4l2element->colors = NULL;
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}
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/* FIXME: move this stuff to gstv4l2tuner.c? */
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static void
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gst_v4l2_set_defaults (GstV4l2Element * v4l2element)
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{
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GstTunerNorm *norm = NULL;
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GstTunerChannel *channel = NULL;
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GstTuner *tuner = GST_TUNER (v4l2element);
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if (v4l2element->norm)
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norm = gst_tuner_find_norm_by_name (tuner, v4l2element->norm);
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if (norm) {
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gst_tuner_set_norm (tuner, norm);
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} else {
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norm = GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2element)));
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v4l2element->norm = g_strdup (norm->label);
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gst_tuner_norm_changed (tuner, norm);
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g_object_notify (G_OBJECT (v4l2element), "norm");
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}
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if (v4l2element->channel)
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channel = gst_tuner_find_channel_by_name (tuner, v4l2element->channel);
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if (channel) {
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gst_tuner_set_channel (tuner, channel);
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} else {
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channel =
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GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2element)));
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v4l2element->channel = g_strdup (channel->label);
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gst_tuner_channel_changed (tuner, channel);
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g_object_notify (G_OBJECT (v4l2element), "channel");
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}
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if (v4l2element->frequency != 0) {
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gst_tuner_set_frequency (tuner, channel, v4l2element->frequency);
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} else {
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v4l2element->frequency = gst_tuner_get_frequency (tuner, channel);
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if (v4l2element->frequency == 0) {
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/* guess */
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gst_tuner_set_frequency (tuner, channel, 1000);
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} else {
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g_object_notify (G_OBJECT (v4l2element), "frequency");
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}
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}
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}
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/******************************************************
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* gst_v4l2_open():
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* open the video device (v4l2element->device)
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4l2_open (GstV4l2Element * v4l2element)
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{
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DEBUG ("Trying to open device %s", v4l2element->device);
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GST_V4L2_CHECK_NOT_OPEN (v4l2element);
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GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
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/* be sure we have a device */
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if (!v4l2element->device)
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v4l2element->device = g_strdup ("/dev/video");
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/* open the device */
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v4l2element->video_fd = open (v4l2element->device, O_RDWR);
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if (!GST_V4L2_IS_OPEN (v4l2element)) {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, OPEN_READ_WRITE,
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(_("Could not open device \"%s\" for reading and writing."),
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v4l2element->device), GST_ERROR_SYSTEM);
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goto error;
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}
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/* get capabilities */
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if (!gst_v4l2_get_capabilities (v4l2element)) {
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goto error;
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}
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/* do we need to be a capture device? */
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if (GST_IS_V4L2SRC (v4l2element) &&
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!(v4l2element->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
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GST_ELEMENT_ERROR (v4l2element, RESOURCE, NOT_FOUND,
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(_("Device \"%s\" is not a capture device."), v4l2element->device),
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("Capabilities: 0x%x", v4l2element->vcap.capabilities));
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goto error;
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}
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/* create enumerations */
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if (!gst_v4l2_fill_lists (v4l2element))
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goto error;
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/* set defaults */
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gst_v4l2_set_defaults (v4l2element);
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GST_INFO_OBJECT (v4l2element, "Opened device '%s' (%s) successfully\n",
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v4l2element->vcap.card, v4l2element->device);
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return TRUE;
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error:
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if (GST_V4L2_IS_OPEN (v4l2element)) {
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/* close device */
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close (v4l2element->video_fd);
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v4l2element->video_fd = -1;
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}
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/* empty lists */
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gst_v4l2_empty_lists (v4l2element);
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return FALSE;
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}
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/******************************************************
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* gst_v4l2_close():
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* close the video device (v4l2element->video_fd)
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4l2_close (GstV4l2Element * v4l2element)
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{
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DEBUG ("Trying to close %s", v4l2element->device);
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GST_V4L2_CHECK_OPEN (v4l2element);
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GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
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/* close device */
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close (v4l2element->video_fd);
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v4l2element->video_fd = -1;
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/* empty lists */
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gst_v4l2_empty_lists (v4l2element);
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return TRUE;
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}
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/******************************************************
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* gst_v4l2_get_norm()
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* Get the norm of the current device
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* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_get_norm (GstV4l2Element * v4l2element, v4l2_std_id * norm)
|
|
{
|
|
DEBUG ("getting norm");
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_STD, norm) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get the current norm for device %s: %s",
|
|
v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_set_norm()
|
|
* Set the norm of the current device
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_set_norm (GstV4l2Element * v4l2element, v4l2_std_id norm)
|
|
{
|
|
DEBUG ("trying to set norm to %llx", norm);
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_S_STD, &norm) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to set norm 0x%llx for device %s: %s",
|
|
norm, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_get_input()
|
|
* Get the input of the current device
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_get_input (GstV4l2Element * v4l2element, gint * input)
|
|
{
|
|
gint n;
|
|
|
|
DEBUG ("trying to get input");
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_INPUT, &n) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get current input on device %s: %s",
|
|
v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
*input = n;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_set_input()
|
|
* Set the input of the current device
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_set_input (GstV4l2Element * v4l2element, gint input)
|
|
{
|
|
DEBUG ("trying to set input to %d", input);
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_S_INPUT, &input) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to set input %d on device %s: %s",
|
|
input, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_get_output()
|
|
* Get the output of the current device
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_get_output (GstV4l2Element * v4l2element, gint * output)
|
|
{
|
|
gint n;
|
|
|
|
DEBUG ("trying to get output");
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_OUTPUT, &n) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get current output on device %s: %s",
|
|
v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
*output = n;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_set_output()
|
|
* Set the output of the current device
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_set_output (GstV4l2Element * v4l2element, gint output)
|
|
{
|
|
DEBUG ("trying to set output to %d", output);
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_S_OUTPUT, &output) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to set output %d on device %s: %s",
|
|
output, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_get_frequency():
|
|
* get the current frequency
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_get_frequency (GstV4l2Element * v4l2element,
|
|
gint tunernum, gulong * frequency)
|
|
{
|
|
struct v4l2_frequency freq;
|
|
|
|
DEBUG ("getting current tuner frequency");
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
freq.tuner = tunernum;
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get current tuner frequency for device %s: %s",
|
|
v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
*frequency = freq.frequency;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_set_frequency():
|
|
* set frequency
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_set_frequency (GstV4l2Element * v4l2element,
|
|
gint tunernum, gulong frequency)
|
|
{
|
|
struct v4l2_frequency freq;
|
|
|
|
DEBUG ("setting current tuner frequency to %lu", frequency);
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
GST_V4L2_CHECK_NOT_ACTIVE (v4l2element);
|
|
|
|
freq.tuner = tunernum;
|
|
/* fill in type - ignore error */
|
|
ioctl (v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq);
|
|
freq.frequency = frequency;
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to set tuner frequency to %lu for device %s: %s",
|
|
frequency, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* 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 (GstV4l2Element * v4l2element,
|
|
gint tunernum, gulong * signal_strength)
|
|
{
|
|
struct v4l2_tuner tuner;
|
|
|
|
DEBUG ("trying to get signal strength");
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
tuner.index = tunernum;
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_TUNER, &tuner) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get signal strength for device %s: %s",
|
|
v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
*signal_strength = tuner.signal;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* 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 (GstV4l2Element * v4l2element,
|
|
int attribute_num, int *value)
|
|
{
|
|
struct v4l2_control control;
|
|
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
DEBUG ("getting value of attribute %d", attribute_num);
|
|
|
|
control.id = attribute_num;
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_G_CTRL, &control) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to get value for control %d on device %s: %s",
|
|
attribute_num, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
*value = control.value;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* 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 (GstV4l2Element * v4l2element,
|
|
int attribute_num, const int value)
|
|
{
|
|
struct v4l2_control control;
|
|
|
|
GST_V4L2_CHECK_OPEN (v4l2element);
|
|
|
|
DEBUG ("setting value of attribute %d to %d", attribute_num, value);
|
|
|
|
control.id = attribute_num;
|
|
control.value = value;
|
|
|
|
if (ioctl (v4l2element->video_fd, VIDIOC_S_CTRL, &control) < 0) {
|
|
GST_ELEMENT_ERROR (v4l2element, RESOURCE, SETTINGS, (NULL),
|
|
("Failed to set value %d for control %d on device %s: %s",
|
|
value, attribute_num, v4l2element->device, g_strerror (errno)));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|