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Original commit message from CVS: compatibility fix for new GST_DEBUG stuff. Includes fixes for missing includes for config.h and unistd.h I only ensured for plugins I can build that they work, so if some of them are still broken, you gotta fix them yourselves unfortunately.
796 lines
22 KiB
C
796 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 "v4l2_calls.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(GST_ELEMENT(v4l2element),
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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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DEBUG("getting enumerations");
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GST_V4L2_CHECK_OPEN(v4l2element);
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/* and now, the inputs */
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for (n=0;;n++) {
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struct v4l2_input input, *inpptr;
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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(GST_ELEMENT(v4l2element),
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"Failed to get no. %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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inpptr = g_malloc(sizeof(input));
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memcpy(inpptr, &input, sizeof(input));
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v4l2element->inputs = g_list_append(v4l2element->inputs, inpptr);
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v4l2element->input_names = g_list_append(v4l2element->input_names, inpptr->name);
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}
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/* outputs */
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for (n=0;;n++) {
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struct v4l2_output output, *outptr;
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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(GST_ELEMENT(v4l2element),
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"Failed to get no. %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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outptr = g_malloc(sizeof(output));
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memcpy(outptr, &output, sizeof(output));
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v4l2element->outputs = g_list_append(v4l2element->outputs, outptr);
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v4l2element->output_names = g_list_append(v4l2element->output_names, outptr->name);
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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, *stdptr;
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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(GST_ELEMENT(v4l2element),
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"Failed to get no. %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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stdptr = g_malloc(sizeof(standard));
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memcpy(stdptr, &standard, sizeof(standard));
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v4l2element->norms = g_list_append(v4l2element->norms, stdptr);
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v4l2element->norm_names = g_list_append(v4l2element->norm_names, stdptr->name);
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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, *ctrlptr;
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GList *menus = NULL;
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GParamSpec *spec = NULL;
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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(GST_ELEMENT(v4l2element),
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"Failed to get no. %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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ctrlptr = g_malloc(sizeof(control));
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memcpy(ctrlptr, &control, sizeof(control));
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v4l2element->controls = g_list_append(v4l2element->controls, ctrlptr);
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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(GST_ELEMENT(v4l2element),
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"Failed to get no. %d in menu %d enumeration for %s: %s",
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i, 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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switch (control.type) {
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case V4L2_CTRL_TYPE_INTEGER:
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spec = g_param_spec_int(ctrlptr->name, ctrlptr->name,
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ctrlptr->name, ctrlptr->minimum, ctrlptr->maximum,
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ctrlptr->default_value, G_PARAM_READWRITE);
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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spec = g_param_spec_boolean(ctrlptr->name, ctrlptr->name,
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ctrlptr->name, ctrlptr->default_value,
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G_PARAM_READWRITE);
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break;
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case V4L2_CTRL_TYPE_MENU:
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/* hacky... we abuse pointer for 'no value' */
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spec = g_param_spec_pointer(ctrlptr->name, ctrlptr->name,
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ctrlptr->name, G_PARAM_WRITABLE);
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break;
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case V4L2_CTRL_TYPE_BUTTON:
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/* help?!? */
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spec = NULL;
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break;
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}
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v4l2element->control_specs = g_list_append(v4l2element->control_specs, spec);
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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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/* empty lists */
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while (g_list_length(v4l2element->inputs) > 0) {
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gpointer data = g_list_nth_data(v4l2element->inputs, 0);
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v4l2element->inputs = g_list_remove(v4l2element->inputs, data);
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g_free(data);
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}
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g_list_free(v4l2element->input_names);
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v4l2element->input_names = NULL;
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while (g_list_length(v4l2element->outputs) > 0) {
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gpointer data = g_list_nth_data(v4l2element->outputs, 0);
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v4l2element->outputs = g_list_remove(v4l2element->outputs, data);
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g_free(data);
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}
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g_list_free(v4l2element->output_names);
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v4l2element->output_names = NULL;
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while (g_list_length(v4l2element->norms) > 0) {
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gpointer data = g_list_nth_data(v4l2element->norms, 0);
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v4l2element->norms = g_list_remove(v4l2element->norms, data);
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g_free(data);
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}
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g_list_free(v4l2element->norm_names);
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v4l2element->norm_names = NULL;
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while (g_list_length(v4l2element->controls) > 0) {
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gpointer data = g_list_nth_data(v4l2element->controls, 0);
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v4l2element->controls = g_list_remove(v4l2element->controls, data);
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g_free(data);
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}
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v4l2element->menus = g_list_remove_all(v4l2element->menus, NULL);
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while (g_list_length(v4l2element->menus) > 0) {
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GList *items = (GList *) g_list_nth_data(v4l2element->menus, 0);
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v4l2element->inputs = g_list_remove(v4l2element->inputs, items);
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while (g_list_length(items) > 0) {
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gpointer data = g_list_nth_data(v4l2element->menus, 0);
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items = g_list_remove(items, data);
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g_free(data);
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}
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}
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while (g_list_length(v4l2element->control_specs) > 0) {
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gpointer data = g_list_nth_data(v4l2element->control_specs, 0);
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v4l2element->control_specs = g_list_remove(v4l2element->control_specs, data);
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g_param_spec_unref(G_PARAM_SPEC(data));
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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(GST_ELEMENT(v4l2element),
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"Failed to open device %s: %s",
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v4l2element->device, g_strerror(errno));
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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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/* create enumerations */
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if (!gst_v4l2_fill_lists(v4l2element))
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goto error;
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gst_info("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
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******************************************************/
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gboolean
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gst_v4l2_get_norm (GstV4l2Element *v4l2element,
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gint *norm)
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{
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v4l2_std_id std_id;
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gint n;
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DEBUG("getting norm");
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GST_V4L2_CHECK_OPEN(v4l2element);
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if (ioctl(v4l2element->video_fd, VIDIOC_G_STD, &std_id) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to get the current norm for device %s: %s",
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v4l2element->device, g_strerror(errno));
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return FALSE;
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}
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/* try to find out what norm number this actually is */
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for (n=0;n<g_list_length(v4l2element->norms);n++) {
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struct v4l2_standard *stdptr = (struct v4l2_standard *) g_list_nth_data(v4l2element->norms, n);
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if (stdptr->id == std_id) {
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*norm = n;
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return TRUE;
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}
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}
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to find norm '%llu' in our list of available norms for device %s",
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std_id, v4l2element->device);
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return FALSE;
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}
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/******************************************************
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* gst_v4l2_set_norm()
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* Set the norm of the current 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_set_norm (GstV4l2Element *v4l2element,
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gint norm)
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{
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struct v4l2_standard *standard;
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DEBUG("trying to set norm to %d", norm);
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GST_V4L2_CHECK_OPEN(v4l2element);
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GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
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if (norm < 0 || norm >= g_list_length(v4l2element->norms)) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Invalid norm number %d (%d-%d)",
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norm, 0, g_list_length(v4l2element->norms));
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return FALSE;
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}
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standard = (struct v4l2_standard *) g_list_nth_data(v4l2element->norms, norm);
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if (ioctl(v4l2element->video_fd, VIDIOC_S_STD, &standard->id) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to set norm '%s' (%llu) for device %s: %s",
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standard->name, standard->id, 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_get_input()
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* Get the input of the current 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_get_input (GstV4l2Element *v4l2element,
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gint *input)
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{
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gint n;
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DEBUG("trying to get input");
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GST_V4L2_CHECK_OPEN(v4l2element);
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if (ioctl(v4l2element->video_fd, VIDIOC_G_INPUT, &n) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to get current input on device %s: %s",
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v4l2element->device, g_strerror(errno));
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return FALSE;
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}
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*input = n;
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return TRUE;
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}
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/******************************************************
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* gst_v4l2_set_input()
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* Set the input of the current 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_set_input (GstV4l2Element *v4l2element,
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gint input)
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{
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DEBUG("trying to set input to %d", input);
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GST_V4L2_CHECK_OPEN(v4l2element);
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GST_V4L2_CHECK_NOT_ACTIVE(v4l2element);
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if (input < 0 || input >= g_list_length(v4l2element->inputs)) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Invalid input number %d (%d-%d)",
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input, 0, g_list_length(v4l2element->inputs));
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|
return FALSE;
|
|
}
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_S_INPUT, &input) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"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(GST_ELEMENT(v4l2element),
|
|
"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 (output < 0 || output >= g_list_length(v4l2element->outputs)) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Invalid output number %d (%d-%d)",
|
|
output, 0, g_list_length(v4l2element->outputs));
|
|
return FALSE;
|
|
}
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_S_OUTPUT, &output) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Failed to set output %d on device %s: %s",
|
|
output, v4l2element->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_has_tuner():
|
|
* Check whether the device has a tuner
|
|
* return value: TRUE if it has a tuner, else FALSE
|
|
******************************************************/
|
|
|
|
gint
|
|
gst_v4l2_has_tuner (GstV4l2Element *v4l2element,
|
|
gint *tuner_num)
|
|
{
|
|
gint input_num;
|
|
struct v4l2_input *input;
|
|
|
|
DEBUG("detecting whether device has a tuner");
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
if (!gst_v4l2_get_input(v4l2element, &input_num))
|
|
return FALSE;
|
|
|
|
input = (struct v4l2_input *) g_list_nth_data(v4l2element->inputs, input_num);
|
|
|
|
if (input->type == V4L2_INPUT_TYPE_TUNER &&
|
|
v4l2element->vcap.capabilities & V4L2_CAP_TUNER) {
|
|
*tuner_num = input->tuner;
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_get_frequency():
|
|
* get the current frequency
|
|
* return value: TRUE on success, FALSE on error
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_get_frequency (GstV4l2Element *v4l2element,
|
|
gulong *frequency)
|
|
{
|
|
struct v4l2_frequency freq;
|
|
|
|
DEBUG("getting current tuner frequency");
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
if (!gst_v4l2_has_tuner(v4l2element, &freq.tuner))
|
|
return FALSE;
|
|
|
|
freq.type = 0;
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"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,
|
|
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);
|
|
|
|
if (!gst_v4l2_has_tuner(v4l2element, &freq.tuner))
|
|
return FALSE;
|
|
|
|
freq.frequency = frequency;
|
|
freq.type = 0;
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"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,
|
|
gulong *signal_strength)
|
|
{
|
|
struct v4l2_tuner tuner;
|
|
|
|
DEBUG("trying to get signal strength");
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_TUNER, &tuner) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Failed to get signal strength for device %s: %s",
|
|
v4l2element->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
*signal_strength = tuner.signal;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_has_audio():
|
|
* Check whether the device has audio capabilities
|
|
* return value: TRUE if it has a tuner, else FALSE
|
|
******************************************************/
|
|
|
|
gboolean
|
|
gst_v4l2_has_audio (GstV4l2Element *v4l2element)
|
|
{
|
|
gint input_num;
|
|
struct v4l2_input *input;
|
|
|
|
DEBUG("detecting whether device has audio");
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
if (!gst_v4l2_get_input(v4l2element, &input_num))
|
|
return FALSE;
|
|
|
|
input = (struct v4l2_input *) g_list_nth_data(v4l2element->inputs, input_num);
|
|
|
|
return (input->audioset != 0);
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* gst_v4l2_control_name_to_num():
|
|
* convert name to num (-1 if nothing)
|
|
******************************************************/
|
|
|
|
static gint
|
|
gst_v4l2_control_name_to_num (GstV4l2Element *v4l2element,
|
|
const gchar *name)
|
|
{
|
|
GList *item;
|
|
|
|
for (item = v4l2element->controls; item != NULL; item = item->next) {
|
|
struct v4l2_queryctrl *ctrl = item->data;
|
|
if (!strcmp(ctrl->name, name))
|
|
return ctrl->id;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
|
|
/******************************************************
|
|
* 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 (GstElement *element,
|
|
const gchar *name,
|
|
int *value)
|
|
{
|
|
struct v4l2_control control;
|
|
GstV4l2Element *v4l2element;
|
|
gint attribute_num = -1;
|
|
|
|
g_return_val_if_fail(element != NULL && name != NULL && value != NULL, FALSE);
|
|
g_return_val_if_fail(GST_IS_V4L2ELEMENT(element), FALSE);
|
|
v4l2element = GST_V4L2ELEMENT(element);
|
|
|
|
DEBUG("getting value of attribute %d", attribute_num);
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
attribute_num = gst_v4l2_control_name_to_num(v4l2element, name);
|
|
|
|
if (attribute_num < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Invalid control %s", name);
|
|
return FALSE;
|
|
}
|
|
|
|
control.id = attribute_num;
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_CTRL, &control) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Failed to get value for control %s (%d) on device %s: %s",
|
|
name, 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 (GstElement *element,
|
|
const gchar *name,
|
|
const int value)
|
|
{
|
|
struct v4l2_control control;
|
|
GstV4l2Element *v4l2element;
|
|
gint attribute_num = -1;
|
|
|
|
g_return_val_if_fail(element != NULL && name != NULL, FALSE);
|
|
g_return_val_if_fail(GST_IS_V4L2ELEMENT(element), FALSE);
|
|
v4l2element = GST_V4L2ELEMENT(element);
|
|
|
|
DEBUG("setting value of attribute %d to %d", attribute_num, value);
|
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
|
|
|
attribute_num = gst_v4l2_control_name_to_num(v4l2element, name);
|
|
|
|
if (attribute_num < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Invalid control %s", name);
|
|
return FALSE;
|
|
}
|
|
|
|
control.id = attribute_num;
|
|
control.value = value;
|
|
|
|
if (ioctl(v4l2element->video_fd, VIDIOC_S_CTRL, &control) < 0) {
|
|
gst_element_error(GST_ELEMENT(v4l2element),
|
|
"Failed to set value %d for control %s (%d) on device %s: %s",
|
|
value, name, attribute_num, v4l2element->device, g_strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|