3 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@gmail.com>
6 * gstv4l2.c: plugin for v4l2 elements
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
29 # define _GNU_SOURCE /* O_CLOEXEC */
32 #include "gst/gst-i18n-plugin.h"
39 #include <sys/types.h>
42 #include "ext/videodev2.h"
43 #include "v4l2-utils.h"
45 #include "gstv4l2object.h"
46 #include "gstv4l2src.h"
47 #include "gstv4l2sink.h"
48 #include "gstv4l2radio.h"
49 #include "gstv4l2videodec.h"
50 #include "gstv4l2fwhtenc.h"
51 #include "gstv4l2h263enc.h"
52 #include "gstv4l2h264enc.h"
53 #include "gstv4l2h265enc.h"
54 #include "gstv4l2jpegenc.h"
55 #include "gstv4l2mpeg4enc.h"
56 #include "gstv4l2vp8enc.h"
57 #include "gstv4l2vp9enc.h"
58 #include "gstv4l2deviceprovider.h"
59 #include "gstv4l2transform.h"
61 /* used in gstv4l2object.c and v4l2_calls.c */
62 GST_DEBUG_CATEGORY (v4l2_debug);
63 #define GST_CAT_DEFAULT v4l2_debug
65 #ifdef GST_V4L2_ENABLE_PROBE
66 /* This is a minimalist probe, for speed, we only enumerate formats */
68 gst_v4l2_probe_template_caps (const gchar * device, gint video_fd,
69 enum v4l2_buf_type type)
72 struct v4l2_fmtdesc format;
75 GST_DEBUG ("Getting %s format enumerations", device);
76 caps = gst_caps_new_empty ();
79 GstStructure *template;
81 memset (&format, 0, sizeof (format));
86 if (ioctl (video_fd, VIDIOC_ENUM_FMT, &format) < 0)
87 break; /* end of enumeration */
89 GST_LOG ("index: %u", format.index);
90 GST_LOG ("type: %d", format.type);
91 GST_LOG ("flags: %08x", format.flags);
92 GST_LOG ("description: '%s'", format.description);
93 GST_LOG ("pixelformat: %" GST_FOURCC_FORMAT,
94 GST_FOURCC_ARGS (format.pixelformat));
96 template = gst_v4l2_object_v4l2fourcc_to_structure (format.pixelformat);
99 GstStructure *alt_t = NULL;
101 switch (format.pixelformat) {
102 case V4L2_PIX_FMT_RGB32:
103 alt_t = gst_structure_copy (template);
104 gst_structure_set (alt_t, "format", G_TYPE_STRING, "ARGB", NULL);
106 case V4L2_PIX_FMT_BGR32:
107 alt_t = gst_structure_copy (template);
108 gst_structure_set (alt_t, "format", G_TYPE_STRING, "BGRA", NULL);
113 gst_caps_append_structure (caps, template);
116 gst_caps_append_structure (caps, alt_t);
120 return gst_caps_simplify (caps);
124 gst_v4l2_probe_and_register (GstPlugin * plugin)
128 struct v4l2_capability vcap;
131 GST_DEBUG ("Probing devices");
133 it = gst_v4l2_iterator_new ();
135 while (gst_v4l2_iterator_next (it)) {
136 GstCaps *src_caps, *sink_caps;
142 video_fd = open (it->device_path, O_RDWR | O_CLOEXEC);
144 if (video_fd == -1) {
145 GST_DEBUG ("Failed to open %s: %s", it->device_path, g_strerror (errno));
149 memset (&vcap, 0, sizeof (vcap));
151 if (ioctl (video_fd, VIDIOC_QUERYCAP, &vcap) < 0) {
152 GST_DEBUG ("Failed to get device capabilities: %s", g_strerror (errno));
156 if (vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
157 device_caps = vcap.device_caps;
159 device_caps = vcap.capabilities;
161 if (!GST_V4L2_IS_M2M (device_caps))
164 GST_DEBUG ("Probing '%s' located at '%s'",
165 it->device_name ? it->device_name : (const gchar *) vcap.driver,
168 /* get sink supported format (no MPLANE for codec) */
169 sink_caps = gst_caps_merge (gst_v4l2_probe_template_caps (it->device_path,
170 video_fd, V4L2_BUF_TYPE_VIDEO_OUTPUT),
171 gst_v4l2_probe_template_caps (it->device_path, video_fd,
172 V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE));
174 /* get src supported format */
175 src_caps = gst_caps_merge (gst_v4l2_probe_template_caps (it->device_path,
176 video_fd, V4L2_BUF_TYPE_VIDEO_CAPTURE),
177 gst_v4l2_probe_template_caps (it->device_path, video_fd,
178 V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE));
180 /* Skip devices without any supported formats */
181 if (gst_caps_is_empty (sink_caps) || gst_caps_is_empty (src_caps)) {
182 gst_caps_unref (sink_caps);
183 gst_caps_unref (src_caps);
187 basename = g_path_get_basename (it->device_path);
189 if (gst_v4l2_is_video_dec (sink_caps, src_caps)) {
190 gst_v4l2_video_dec_register (plugin, basename, it->device_path,
191 sink_caps, src_caps);
192 } else if (gst_v4l2_is_video_enc (sink_caps, src_caps, NULL)) {
193 if (gst_v4l2_is_fwht_enc (sink_caps, src_caps))
194 gst_v4l2_fwht_enc_register (plugin, basename, it->device_path,
195 sink_caps, src_caps);
197 if (gst_v4l2_is_h264_enc (sink_caps, src_caps))
198 gst_v4l2_h264_enc_register (plugin, basename, it->device_path,
199 sink_caps, src_caps);
201 if (gst_v4l2_is_h265_enc (sink_caps, src_caps))
202 gst_v4l2_h265_enc_register (plugin, basename, it->device_path,
203 sink_caps, src_caps);
205 if (gst_v4l2_is_mpeg4_enc (sink_caps, src_caps))
206 gst_v4l2_mpeg4_enc_register (plugin, basename, it->device_path,
207 sink_caps, src_caps);
209 if (gst_v4l2_is_h263_enc (sink_caps, src_caps))
210 gst_v4l2_h263_enc_register (plugin, basename, it->device_path,
211 sink_caps, src_caps);
213 if (gst_v4l2_is_jpeg_enc (sink_caps, src_caps))
214 gst_v4l2_jpeg_enc_register (plugin, basename, it->device_path,
215 sink_caps, src_caps);
217 if (gst_v4l2_is_vp8_enc (sink_caps, src_caps))
218 gst_v4l2_vp8_enc_register (plugin, basename, it->device_path,
219 sink_caps, src_caps);
221 if (gst_v4l2_is_vp9_enc (sink_caps, src_caps))
222 gst_v4l2_vp9_enc_register (plugin, basename, it->device_path,
223 sink_caps, src_caps);
224 } else if (gst_v4l2_is_transform (sink_caps, src_caps)) {
225 gst_v4l2_transform_register (plugin, basename, it->device_path,
226 sink_caps, src_caps);
228 /* else if ( ... etc. */
230 gst_caps_unref (sink_caps);
231 gst_caps_unref (src_caps);
238 gst_v4l2_iterator_free (it);
245 plugin_init (GstPlugin * plugin)
247 const gchar *paths[] = { "/dev", "/dev/v4l2", NULL };
248 const gchar *names[] = { "video", NULL };
250 GST_DEBUG_CATEGORY_INIT (v4l2_debug, "v4l2", 0, "V4L2 API calls");
252 /* Add some depedency, so the dynamic features get updated upon changes in
254 gst_plugin_add_dependency (plugin,
255 NULL, paths, names, GST_PLUGIN_DEPENDENCY_FLAG_FILE_NAME_IS_PREFIX);
257 if (!gst_element_register (plugin, "v4l2src", GST_RANK_PRIMARY,
259 !gst_element_register (plugin, "v4l2sink", GST_RANK_NONE,
260 GST_TYPE_V4L2SINK) ||
261 !gst_element_register (plugin, "v4l2radio", GST_RANK_NONE,
262 GST_TYPE_V4L2RADIO) ||
263 !gst_device_provider_register (plugin, "v4l2deviceprovider",
264 GST_RANK_PRIMARY, GST_TYPE_V4L2_DEVICE_PROVIDER)
266 #ifdef GST_V4L2_ENABLE_PROBE
267 || !gst_v4l2_probe_and_register (plugin)
273 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
274 bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
275 #endif /* ENABLE_NLS */
280 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
283 "elements for Video 4 Linux",
284 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)