mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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e97a954008
This allow reusing the code that produces output and capture devices templates. This fixes the lack of Interlaced caps feature for M2M devices such as decoder, encoder or converters. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7540>
230 lines
7 KiB
C
230 lines
7 KiB
C
/* GStreamer
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*
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* 2006 Edgard Lima <edgard.lima@gmail.com>
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*
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* gstv4l2.c: plugin for v4l2 elements
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE /* O_CLOEXEC */
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#endif
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#include <glib/gi18n-lib.h>
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#include <gst/gst.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "ext/videodev2.h"
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#include "gstv4l2elements.h"
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#include "v4l2-utils.h"
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#include "gstv4l2object.h"
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#include "gstv4l2src.h"
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#include "gstv4l2sink.h"
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#include "gstv4l2radio.h"
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#include "gstv4l2videodec.h"
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#include "gstv4l2fwhtenc.h"
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#include "gstv4l2h263enc.h"
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#include "gstv4l2h264enc.h"
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#include "gstv4l2h265enc.h"
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#include "gstv4l2jpegenc.h"
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#include "gstv4l2mpeg4enc.h"
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#include "gstv4l2vp8enc.h"
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#include "gstv4l2vp9enc.h"
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#include "gstv4l2transform.h"
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GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
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#define GST_CAT_DEFAULT v4l2_debug
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#ifdef GST_V4L2_ENABLE_PROBE
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static gboolean
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gst_v4l2_probe_and_register (GstPlugin * plugin)
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{
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GstV4l2Iterator *it;
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gint video_fd = -1;
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struct v4l2_capability vcap;
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guint32 device_caps;
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enum v4l2_buf_type output_type, capture_type;
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v4l2_element_init (plugin);
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GST_DEBUG ("Probing devices");
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it = gst_v4l2_iterator_new ();
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while (gst_v4l2_iterator_next (it)) {
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GstCaps *src_caps, *sink_caps;
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gchar *basename;
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if (video_fd >= 0)
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close (video_fd);
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/* FIXME, missing libv4l2 support */
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video_fd = open (it->device_path, O_RDWR | O_CLOEXEC);
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if (video_fd == -1) {
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GST_DEBUG ("Failed to open %s: %s", it->device_path, g_strerror (errno));
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continue;
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}
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memset (&vcap, 0, sizeof (vcap));
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if (ioctl (video_fd, VIDIOC_QUERYCAP, &vcap) < 0) {
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GST_DEBUG ("Failed to get device '%s' capabilities: %s",
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it->device_path, g_strerror (errno));
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continue;
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}
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if (vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
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device_caps = vcap.device_caps;
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else
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device_caps = vcap.capabilities;
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if (!GST_V4L2_IS_M2M (device_caps))
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continue;
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if (device_caps & V4L2_CAP_VIDEO_M2M_MPLANE) {
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output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
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capture_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
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} else {
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output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
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capture_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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}
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GST_DEBUG ("Probing '%s' located at '%s'",
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it->device_name ? it->device_name : (const gchar *) vcap.driver,
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it->device_path);
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/* get sink supported format (no MPLANE for codec) */
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sink_caps = gst_v4l2_object_probe_template_caps (it->device_path,
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video_fd, output_type);
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/* get src supported format */
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src_caps = gst_v4l2_object_probe_template_caps (it->device_path,
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video_fd, capture_type);
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/* Skip devices without any supported formats */
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if (gst_caps_is_empty (sink_caps) || gst_caps_is_empty (src_caps)) {
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gst_caps_unref (sink_caps);
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gst_caps_unref (src_caps);
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GST_DEBUG ("Skipping unsupported device '%s' located at '%s'",
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it->device_name ? it->device_name : (const gchar *) vcap.driver,
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it->device_path);
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continue;
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}
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basename = g_path_get_basename (it->device_path);
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/* Caps won't be freed if the subclass is not instantiated */
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GST_MINI_OBJECT_FLAG_SET (sink_caps, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
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GST_MINI_OBJECT_FLAG_SET (src_caps, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
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if (gst_v4l2_is_video_dec (sink_caps, src_caps)) {
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gst_v4l2_video_dec_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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} else if (gst_v4l2_is_video_enc (sink_caps, src_caps, NULL)) {
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if (gst_v4l2_is_fwht_enc (sink_caps, src_caps))
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gst_v4l2_fwht_enc_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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if (gst_v4l2_is_h264_enc (sink_caps, src_caps))
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gst_v4l2_h264_enc_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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if (gst_v4l2_is_h265_enc (sink_caps, src_caps))
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gst_v4l2_h265_enc_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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if (gst_v4l2_is_mpeg4_enc (sink_caps, src_caps))
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gst_v4l2_mpeg4_enc_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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if (gst_v4l2_is_h263_enc (sink_caps, src_caps))
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gst_v4l2_h263_enc_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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if (gst_v4l2_is_jpeg_enc (sink_caps, src_caps))
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gst_v4l2_jpeg_enc_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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if (gst_v4l2_is_vp8_enc (sink_caps, src_caps))
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gst_v4l2_vp8_enc_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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if (gst_v4l2_is_vp9_enc (sink_caps, src_caps))
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gst_v4l2_vp9_enc_register (plugin, basename, it->device_path,
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video_fd, sink_caps, src_caps);
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} else if (gst_v4l2_is_transform (sink_caps, src_caps)) {
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gst_v4l2_transform_register (plugin, basename, it->device_path,
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sink_caps, src_caps);
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}
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/* else if ( ... etc. */
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gst_caps_unref (sink_caps);
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gst_caps_unref (src_caps);
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g_free (basename);
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}
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if (video_fd >= 0)
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close (video_fd);
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gst_v4l2_iterator_free (it);
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return TRUE;
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}
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#endif
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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gboolean ret = FALSE;
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const gchar *paths[] = { "/dev", "/dev/v4l2", NULL };
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const gchar *names[] = { "video", NULL };
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/* Add some dependency, so the dynamic features get updated upon changes in
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* /dev/video* */
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gst_plugin_add_dependency (plugin,
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NULL, paths, names, GST_PLUGIN_DEPENDENCY_FLAG_FILE_NAME_IS_PREFIX);
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#ifdef GST_V4L2_ENABLE_PROBE
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ret |= gst_v4l2_probe_and_register (plugin);
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#endif
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ret |= GST_ELEMENT_REGISTER (v4l2src, plugin);
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ret |= GST_ELEMENT_REGISTER (v4l2sink, plugin);
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ret |= GST_ELEMENT_REGISTER (v4l2radio, plugin);
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ret |= GST_DEVICE_PROVIDER_REGISTER (v4l2deviceprovider, plugin);
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return ret;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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video4linux2,
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"elements for Video 4 Linux",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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