mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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864 lines
24 KiB
C
864 lines
24 KiB
C
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/* 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_ELEMENT(GST_CAT_PLUGIN_INFO, \
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GST_ELEMENT(v4l2element), \
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"V4L2: " format "\n", ##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, sys_errlist[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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/* create enumeration lists - let's start with format enumeration */
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for (n=0;;n++) {
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struct v4l2_fmtdesc format, *fmtptr;
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format.index = n;
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if (ioctl(v4l2element->video_fd, VIDIOC_ENUM_PIXFMT, &format) < 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 pixelformat enumeration for %s: %s",
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n, v4l2element->device, sys_errlist[errno]);
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return FALSE;
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}
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}
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fmtptr = g_malloc(sizeof(format));
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memcpy(fmtptr, &format, sizeof(format));
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v4l2element->formats = g_list_append(v4l2element->formats, fmtptr);
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}
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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, sys_errlist[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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}
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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, sys_errlist[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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}
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/* norms... */
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for (n=0;;n++) {
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struct v4l2_enumstd 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, sys_errlist[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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}
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/* and lastly, controls+menus (if appropriate) */
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for (n=0;;n++) {
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struct v4l2_queryctrl control, *ctrlptr;
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GList *menus = NULL;
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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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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 control enumeration for %s: %s",
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n, v4l2element->device, sys_errlist[errno]);
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return FALSE;
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}
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}
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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, sys_errlist[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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}
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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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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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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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while (g_list_length(v4l2element->formats) > 0) {
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gpointer data = g_list_nth_data(v4l2element->formats, 0);
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v4l2element->formats = g_list_remove(v4l2element->formats, data);
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g_free(data);
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}
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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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}
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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, sys_errlist[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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/* and get the video window */
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if (GST_V4L2_IS_OVERLAY(v4l2element)) {
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if (ioctl(v4l2element->video_fd, VIDIOC_G_WIN, &(v4l2element->vwin)) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to get video window properties of %s: %s",
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v4l2element->device, sys_errlist[errno]);
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goto error;
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}
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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.name, 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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struct v4l2_standard standard;
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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, &standard) < 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, sys_errlist[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_enumstd *stdptr = (struct v4l2_enumstd *) g_list_nth_data(v4l2element->norms, n);
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if (!strcmp(stdptr->std.name, standard.name)) {
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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 '%s' in our list of available norms for device %s",
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standard.name, 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_enumstd *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_enumstd *) g_list_nth_data(v4l2element->norms, norm);
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if (ioctl(v4l2element->video_fd, VIDIOC_S_STD, &standard->std) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to set norm '%s' (%d) for device %s: %s",
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||
|
standard->std.name, norm, v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l2_get_norm_names()
|
||
|
* Get the list of available norms
|
||
|
* return value: the list
|
||
|
******************************************************/
|
||
|
|
||
|
GList *
|
||
|
gst_v4l2_get_norm_names (GstV4l2Element *v4l2element)
|
||
|
{
|
||
|
GList *names = NULL;
|
||
|
gint n;
|
||
|
|
||
|
DEBUG("getting a list of norm names");
|
||
|
|
||
|
for (n=0;n<g_list_length(v4l2element->norms);n++) {
|
||
|
struct v4l2_enumstd *standard = (struct v4l2_enumstd *) g_list_nth_data(v4l2element->norms, n);
|
||
|
names = g_list_append(names, g_strdup(standard->std.name));
|
||
|
}
|
||
|
|
||
|
return names;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* 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(GST_ELEMENT(v4l2element),
|
||
|
"Failed to get current input on device %s: %s",
|
||
|
v4l2element->device, sys_errlist[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 (input < 0 || input >= g_list_length(v4l2element->inputs)) {
|
||
|
gst_element_error(GST_ELEMENT(v4l2element),
|
||
|
"Invalid input number %d (%d-%d)",
|
||
|
input, 0, g_list_length(v4l2element->inputs));
|
||
|
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, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l2_get_input_names()
|
||
|
* Get the list of available input channels
|
||
|
* return value: the list
|
||
|
******************************************************/
|
||
|
|
||
|
GList *
|
||
|
gst_v4l2_get_input_names (GstV4l2Element *v4l2element)
|
||
|
{
|
||
|
GList *names = NULL;
|
||
|
gint n;
|
||
|
|
||
|
DEBUG("getting a list of input names");
|
||
|
|
||
|
for (n=0;n<g_list_length(v4l2element->inputs);n++) {
|
||
|
struct v4l2_input *input = (struct v4l2_input *) g_list_nth_data(v4l2element->inputs, n);
|
||
|
names = g_list_append(names, g_strdup(input->name));
|
||
|
}
|
||
|
|
||
|
return names;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* 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, sys_errlist[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, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l2_get_output_names()
|
||
|
* Get the list of available output channels
|
||
|
* return value: the list, or NULL on error
|
||
|
******************************************************/
|
||
|
|
||
|
GList *
|
||
|
gst_v4l2_get_output_names (GstV4l2Element *v4l2element)
|
||
|
{
|
||
|
GList *names = NULL;
|
||
|
gint n;
|
||
|
|
||
|
DEBUG("getting a list of output names");
|
||
|
|
||
|
for (n=0;n<g_list_length(v4l2element->outputs);n++) {
|
||
|
struct v4l2_output *output = (struct v4l2_output *) g_list_nth_data(v4l2element->outputs, n);
|
||
|
names = g_list_append(names, g_strdup(output->name));
|
||
|
}
|
||
|
|
||
|
return names;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_has_tuner():
|
||
|
* Check whether the device has a tuner
|
||
|
* return value: TRUE if it has a tuner, else FALSE
|
||
|
******************************************************/
|
||
|
|
||
|
gboolean
|
||
|
gst_v4l2_has_tuner (GstV4l2Element *v4l2element)
|
||
|
{
|
||
|
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);
|
||
|
|
||
|
return (input->type == V4L2_INPUT_TYPE_TUNER &&
|
||
|
v4l2element->vcap.flags & V4L2_FLAG_TUNER);
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_get_frequency():
|
||
|
* get the current frequency
|
||
|
* return value: TRUE on success, FALSE on error
|
||
|
******************************************************/
|
||
|
|
||
|
gboolean
|
||
|
gst_v4l2_get_frequency (GstV4l2Element *v4l2element,
|
||
|
gulong *frequency)
|
||
|
{
|
||
|
gint n;
|
||
|
|
||
|
DEBUG("getting current tuner frequency");
|
||
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
||
|
|
||
|
if (!gst_v4l2_has_tuner(v4l2element))
|
||
|
return FALSE;
|
||
|
|
||
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_FREQ, &n) < 0) {
|
||
|
gst_element_error(GST_ELEMENT(v4l2element),
|
||
|
"Failed to get current tuner frequency for device %s: %s",
|
||
|
v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
*frequency = n;
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_set_frequency():
|
||
|
* set frequency
|
||
|
* return value: TRUE on success, FALSE on error
|
||
|
******************************************************/
|
||
|
|
||
|
gboolean
|
||
|
gst_v4l2_set_frequency (GstV4l2Element *v4l2element,
|
||
|
gulong frequency)
|
||
|
{
|
||
|
gint n = frequency;
|
||
|
|
||
|
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))
|
||
|
return FALSE;
|
||
|
|
||
|
if (ioctl(v4l2element->video_fd, VIDIOC_G_FREQ, &n) < 0) {
|
||
|
gst_element_error(GST_ELEMENT(v4l2element),
|
||
|
"Failed to set tuner frequency to %lu for device %s: %s",
|
||
|
frequency, v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_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 set signal strength for device %s: %s",
|
||
|
v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
*signal_strength = tuner.signal;
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_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->capability & V4L2_INPUT_CAP_AUDIO);
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_get_attributes():
|
||
|
* get a list of attributes available on this device
|
||
|
* return value: the list
|
||
|
******************************************************/
|
||
|
|
||
|
GList *
|
||
|
gst_v4l2_get_attributes (GstV4l2Element *v4l2element)
|
||
|
{
|
||
|
gint i;
|
||
|
GList *list = NULL;
|
||
|
|
||
|
DEBUG("getting a list of available attributes");
|
||
|
|
||
|
for (i=0;i<g_list_length(v4l2element->controls);i++) {
|
||
|
struct v4l2_queryctrl *control = (struct v4l2_queryctrl *) g_list_nth_data(v4l2element->controls, i);
|
||
|
GstV4l2Attribute* attribute = g_malloc(sizeof(GstV4l2Attribute));
|
||
|
attribute->name = g_strdup(control->name);
|
||
|
attribute->index = i;
|
||
|
attribute->list_items = NULL;
|
||
|
switch (control->type) {
|
||
|
case V4L2_CTRL_TYPE_INTEGER:
|
||
|
attribute->val_type = GST_V4L2_ATTRIBUTE_VALUE_TYPE_INT;
|
||
|
break;
|
||
|
case V4L2_CTRL_TYPE_BOOLEAN:
|
||
|
attribute->val_type = GST_V4L2_ATTRIBUTE_VALUE_TYPE_BOOLEAN;
|
||
|
break;
|
||
|
case V4L2_CTRL_TYPE_MENU: {
|
||
|
/* list items */
|
||
|
gint n;
|
||
|
GList *menus = (GList *) g_list_nth_data(v4l2element->menus, i);
|
||
|
for (n=0;n<g_list_length(menus);n++) {
|
||
|
struct v4l2_querymenu *menu = g_list_nth_data(menus, n);
|
||
|
attribute->list_items = g_list_append(attribute->list_items, g_strdup(menu->name));
|
||
|
}
|
||
|
attribute->val_type = GST_V4L2_ATTRIBUTE_VALUE_TYPE_LIST;
|
||
|
break; }
|
||
|
case V4L2_CTRL_TYPE_BUTTON:
|
||
|
attribute->val_type = GST_V4L2_ATTRIBUTE_VALUE_TYPE_BUTTON;
|
||
|
break;
|
||
|
}
|
||
|
switch (control->category) {
|
||
|
case V4L2_CTRL_CAT_VIDEO:
|
||
|
attribute->type = GST_V4L2_ATTRIBUTE_TYPE_VIDEO;
|
||
|
break;
|
||
|
case V4L2_CTRL_CAT_AUDIO:
|
||
|
attribute->type = GST_V4L2_ATTRIBUTE_TYPE_AUDIO;
|
||
|
break;
|
||
|
case V4L2_CTRL_CAT_EFFECT:
|
||
|
attribute->type = GST_V4L2_ATTRIBUTE_TYPE_EFFECT;
|
||
|
break;
|
||
|
}
|
||
|
gst_v4l2_get_attribute(v4l2element, i, &attribute->value);
|
||
|
attribute->min = control->minimum;
|
||
|
attribute->max = control->maximum;
|
||
|
}
|
||
|
|
||
|
return list;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_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,
|
||
|
gint attribute_num,
|
||
|
gint *value)
|
||
|
{
|
||
|
struct v4l2_control control;
|
||
|
|
||
|
DEBUG("getting value of attribute %d", attribute_num);
|
||
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
||
|
|
||
|
if (attribute_num < 0 || attribute_num >= g_list_length(v4l2element->controls)) {
|
||
|
gst_element_error(GST_ELEMENT(v4l2element),
|
||
|
"Invalid control ID %d", attribute_num);
|
||
|
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 %d on device %s: %s",
|
||
|
attribute_num, v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
*value = control.value;
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|
||
|
|
||
|
/******************************************************
|
||
|
* gst_v4l_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,
|
||
|
gint attribute_num,
|
||
|
gint value)
|
||
|
{
|
||
|
struct v4l2_control control;
|
||
|
|
||
|
DEBUG("setting value of attribute %d to %d", attribute_num, value);
|
||
|
GST_V4L2_CHECK_OPEN(v4l2element);
|
||
|
|
||
|
if (attribute_num < 0 || attribute_num >= g_list_length(v4l2element->controls)) {
|
||
|
gst_element_error(GST_ELEMENT(v4l2element),
|
||
|
"Invalid control ID %d", attribute_num);
|
||
|
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 %d on device %s: %s",
|
||
|
value, attribute_num, v4l2element->device, sys_errlist[errno]);
|
||
|
return FALSE;
|
||
|
}
|
||
|
|
||
|
return TRUE;
|
||
|
}
|
||
|
|