/* GStreamer * * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net> * 2006 Edgard Lima <edgard.lima@indt.org.br> * * gstv4l2.c: plugin for v4l2 elements * * 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 #ifndef _GNU_SOURCE # define _GNU_SOURCE /* O_CLOEXEC */ #endif #include "gst/gst-i18n-plugin.h" #include <gst/gst.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> #include "ext/videodev2.h" #include "v4l2-utils.h" #include "gstv4l2object.h" #include "gstv4l2src.h" #include "gstv4l2sink.h" #include "gstv4l2radio.h" #include "gstv4l2videodec.h" #include "gstv4l2deviceprovider.h" #include "gstv4l2transform.h" /* used in v4l2_calls.c and v4l2src_calls.c */ GST_DEBUG_CATEGORY (v4l2_debug); #define GST_CAT_DEFAULT v4l2_debug #ifdef GST_V4L2_ENABLE_PROBE /* This is a minimalist probe, for speed, we only enumerate formats */ static GstCaps * gst_v4l2_probe_template_caps (const gchar * device, gint video_fd, enum v4l2_buf_type type) { gint n; struct v4l2_fmtdesc format; GstCaps *caps; GST_DEBUG ("Getting %s format enumerations", device); caps = gst_caps_new_empty (); for (n = 0;; n++) { GstStructure *template; memset (&format, 0, sizeof (format)); format.index = n; format.type = type; if (ioctl (video_fd, VIDIOC_ENUM_FMT, &format) < 0) break; /* end of enumeration */ GST_LOG ("index: %u", format.index); GST_LOG ("type: %d", format.type); GST_LOG ("flags: %08x", format.flags); GST_LOG ("description: '%s'", format.description); GST_LOG ("pixelformat: %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (format.pixelformat)); template = gst_v4l2_object_v4l2fourcc_to_structure (format.pixelformat); if (template) { GstStructure *alt_t = NULL; switch (format.pixelformat) { case V4L2_PIX_FMT_RGB32: alt_t = gst_structure_copy (template); gst_structure_set (alt_t, "format", G_TYPE_STRING, "ARGB", NULL); break; case V4L2_PIX_FMT_BGR32: alt_t = gst_structure_copy (template); gst_structure_set (alt_t, "format", G_TYPE_STRING, "BGRA", NULL); default: break; } gst_caps_append_structure (caps, template); if (alt_t) gst_caps_append_structure (caps, alt_t); } } return gst_caps_simplify (caps); } static gboolean gst_v4l2_probe_and_register (GstPlugin * plugin) { GstV4l2Iterator *it; gint video_fd = -1; struct v4l2_capability vcap; gboolean ret = TRUE; it = gst_v4l2_iterator_new (); while (gst_v4l2_iterator_next (it)) { GstCaps *src_caps, *sink_caps; gchar *basename; if (video_fd >= 0) close (video_fd); video_fd = open (it->device_path, O_RDWR | O_CLOEXEC); if (video_fd == -1) { GST_DEBUG ("Failed to open %s: %s", it->device_path, g_strerror (errno)); continue; } memset (&vcap, 0, sizeof (vcap)); if (ioctl (video_fd, VIDIOC_QUERYCAP, &vcap) < 0) { GST_DEBUG ("Failed to get device capabilities: %s", g_strerror (errno)); continue; } if (!((vcap.capabilities & (V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE)) || /* But legacy driver may expose both CAPTURE and OUTPUT */ ((vcap.capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) && (vcap.capabilities & (V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE))))) continue; GST_DEBUG ("Probing '%s' located at '%s'", it->device_name ? it->device_name : (const gchar *) vcap.driver, it->device_path); /* get sink supported format (no MPLANE for codec) */ sink_caps = gst_caps_merge (gst_v4l2_probe_template_caps (it->device_path, video_fd, V4L2_BUF_TYPE_VIDEO_OUTPUT), gst_v4l2_probe_template_caps (it->device_path, video_fd, V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)); /* get src supported format */ src_caps = gst_caps_merge (gst_v4l2_probe_template_caps (it->device_path, video_fd, V4L2_BUF_TYPE_VIDEO_CAPTURE), gst_v4l2_probe_template_caps (it->device_path, video_fd, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)); /* Skip devices without any supported formats */ if (gst_caps_is_empty (sink_caps) || gst_caps_is_empty (src_caps)) { gst_caps_unref (sink_caps); gst_caps_unref (src_caps); continue; } basename = g_path_get_basename (it->device_path); if (gst_v4l2_is_video_dec (sink_caps, src_caps)) ret = gst_v4l2_video_dec_register (plugin, basename, it->device_path, sink_caps, src_caps); else if (gst_v4l2_is_transform (sink_caps, src_caps)) ret = gst_v4l2_transform_register (plugin, basename, it->device_path, sink_caps, src_caps); /* else if ( ... etc. */ gst_caps_unref (sink_caps); gst_caps_unref (src_caps); g_free (basename); if (!ret) break; } if (video_fd >= 0) close (video_fd); gst_v4l2_iterator_free (it); return ret; } #endif static gboolean plugin_init (GstPlugin * plugin) { const gchar *paths[] = { "/dev", "/dev/v4l2", NULL }; const gchar *names[] = { "video", NULL }; GST_DEBUG_CATEGORY_INIT (v4l2_debug, "v4l2", 0, "V4L2 API calls"); /* Add some depedency, so the dynamic features get updated upon changes in * /dev/video* */ gst_plugin_add_dependency (plugin, NULL, paths, names, GST_PLUGIN_DEPENDENCY_FLAG_FILE_NAME_IS_PREFIX); if (!gst_element_register (plugin, "v4l2src", GST_RANK_PRIMARY, GST_TYPE_V4L2SRC) || !gst_element_register (plugin, "v4l2sink", GST_RANK_NONE, GST_TYPE_V4L2SINK) || !gst_element_register (plugin, "v4l2radio", GST_RANK_NONE, GST_TYPE_V4L2RADIO) || !gst_device_provider_register (plugin, "v4l2deviceprovider", GST_RANK_PRIMARY, GST_TYPE_V4L2_DEVICE_PROVIDER) /* etc. */ #ifdef GST_V4L2_ENABLE_PROBE || !gst_v4l2_probe_and_register (plugin) #endif ) return FALSE; #ifdef ENABLE_NLS bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR); bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8"); #endif /* ENABLE_NLS */ return TRUE; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, video4linux2, "elements for Video 4 Linux", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)