1 /*
2 * Copyright (C) 2019 Igalia S.L.
3 * Author: Philippe Normand <philn@igalia.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include <fcntl.h>
27 #include <string.h>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <unistd.h>
31
32 #include "gstv4l2codec.h"
33 #include "ext/videodev2.h"
34
35 #include <gst/gst.h>
36
37 gboolean
gst_v4l2_codec_probe_profiles(const GstV4l2Codec * codec,gint video_fd,GValue * profiles)38 gst_v4l2_codec_probe_profiles (const GstV4l2Codec * codec, gint video_fd,
39 GValue * profiles)
40 {
41 struct v4l2_queryctrl query_ctrl;
42 gboolean ret = FALSE;
43
44 memset (&query_ctrl, 0, sizeof (query_ctrl));
45 query_ctrl.id = codec->profile_cid;
46
47 if (ioctl (video_fd, VIDIOC_QUERYCTRL, &query_ctrl) == 0) {
48 if (query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED)
49 return FALSE;
50
51 if (query_ctrl.type == V4L2_CTRL_TYPE_MENU) {
52 struct v4l2_querymenu query_menu;
53
54 memset (&query_menu, 0, sizeof (query_menu));
55 query_menu.id = query_ctrl.id;
56
57 g_value_init (profiles, GST_TYPE_LIST);
58 for (query_menu.index = query_ctrl.minimum;
59 query_menu.index <= query_ctrl.maximum; query_menu.index++) {
60 if (ioctl (video_fd, VIDIOC_QUERYMENU, &query_menu) >= 0) {
61 GValue value = G_VALUE_INIT;
62
63 g_value_init (&value, G_TYPE_STRING);
64 g_value_set_string (&value,
65 codec->profile_to_string (query_menu.index));
66 gst_value_list_append_and_take_value (profiles, &value);
67 ret = TRUE;
68 }
69 }
70
71 if (gst_value_list_get_size (profiles) == 0) {
72 g_value_unset (profiles);
73 ret = FALSE;
74 }
75 }
76 }
77
78 return ret;
79 }
80
81 gboolean
gst_v4l2_codec_probe_levels(const GstV4l2Codec * codec,gint video_fd,GValue * levels)82 gst_v4l2_codec_probe_levels (const GstV4l2Codec * codec, gint video_fd,
83 GValue * levels)
84 {
85 struct v4l2_queryctrl query_ctrl;
86 gboolean ret = FALSE;
87
88 memset (&query_ctrl, 0, sizeof (query_ctrl));
89 query_ctrl.id = codec->level_cid;
90
91 if (ioctl (video_fd, VIDIOC_QUERYCTRL, &query_ctrl) == 0) {
92 if (query_ctrl.flags & V4L2_CTRL_FLAG_DISABLED)
93 return FALSE;
94
95 if (query_ctrl.type == V4L2_CTRL_TYPE_MENU) {
96 struct v4l2_querymenu query_menu;
97
98 memset (&query_menu, 0, sizeof (query_menu));
99 query_menu.id = query_ctrl.id;
100 query_menu.index = query_ctrl.maximum;
101
102 if (ioctl (video_fd, VIDIOC_QUERYMENU, &query_menu) >= 0) {
103 gint32 i;
104
105 g_value_init (levels, GST_TYPE_LIST);
106
107 /* Assume that all levels below the highest one reported by the driver are supported. */
108 for (i = query_ctrl.minimum; i <= query_ctrl.maximum; i++) {
109 GValue value = G_VALUE_INIT;
110
111 g_value_init (&value, G_TYPE_STRING);
112 g_value_set_string (&value, codec->level_to_string (i));
113 gst_value_list_append_and_take_value (levels, &value);
114 ret = TRUE;
115 }
116
117 if (gst_value_list_get_size (levels) == 0) {
118 g_value_unset (levels);
119 ret = FALSE;
120 }
121 }
122 }
123 }
124
125 return ret;
126 }
127