gstreamer/sys/v4l2/gstv4l2codec.c

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/*
* Copyright (C) 2019 Igalia S.L.
* Author: Philippe Normand <philn@igalia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "gstv4l2codec.h"
#include "ext/videodev2.h"
#include <gst/gst.h>
static GValue *
probe_controls (gint video_fd, guint32 cid,
const gchar * (transform_control) (gint))
{
GValue *controls = NULL;
struct v4l2_queryctrl query_ctrl;
memset (&query_ctrl, 0, sizeof (query_ctrl));
query_ctrl.id = cid;
if (ioctl (video_fd, VIDIOC_QUERYCTRL, &query_ctrl) == 0) {
if (query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
return NULL;
}
if (query_ctrl.type == V4L2_CTRL_TYPE_MENU) {
struct v4l2_querymenu query_menu;
memset (&query_menu, 0, sizeof (query_menu));
query_menu.id = query_ctrl.id;
controls = g_new0 (GValue, 1);
g_value_init (controls, GST_TYPE_LIST);
for (query_menu.index = query_ctrl.minimum;
query_menu.index <= query_ctrl.maximum; query_menu.index++) {
if (ioctl (video_fd, VIDIOC_QUERYMENU, &query_menu) >= 0) {
GValue value = G_VALUE_INIT;
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, transform_control (query_menu.index));
gst_value_list_append_and_take_value (controls, &value);
}
}
if (gst_value_list_get_size (controls) == 0) {
g_value_unset (controls);
controls = NULL;
}
}
}
return controls;
}
GValue *
gst_v4l2_codec_probe_profiles (const GstV4l2Codec * codec, gint video_fd)
{
return probe_controls (video_fd, codec->profile_cid,
codec->profile_to_string);
}
GValue *
gst_v4l2_codec_probe_levels (const GstV4l2Codec * codec, gint video_fd)
{
GValue *controls = NULL;
struct v4l2_queryctrl query_ctrl;
memset (&query_ctrl, 0, sizeof (query_ctrl));
query_ctrl.id = codec->level_cid;
if (ioctl (video_fd, VIDIOC_QUERYCTRL, &query_ctrl) == 0) {
if (query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
return NULL;
}
if (query_ctrl.type == V4L2_CTRL_TYPE_MENU) {
struct v4l2_querymenu query_menu;
memset (&query_menu, 0, sizeof (query_menu));
query_menu.id = query_ctrl.id;
query_menu.index = query_ctrl.maximum;
if (ioctl (video_fd, VIDIOC_QUERYMENU, &query_menu) >= 0) {
gint32 i;
controls = g_new0 (GValue, 1);
g_value_init (controls, GST_TYPE_LIST);
/* Assume that all levels below the highest one reported by the driver are supported. */
for (i = query_ctrl.minimum; i <= query_ctrl.maximum; i++) {
GValue value = G_VALUE_INIT;
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, codec->level_to_string (i));
gst_value_list_append_and_take_value (controls, &value);
}
}
}
}
return controls;
}