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v4l2: Add a common device enumerator
This will allow removing code duplication (hence bugs duplication). https://bugzilla.gnome.org/show_bug.cgi?id=727925
This commit is contained in:
Nicolas Dufresne
Nicolas Dufresne
parent
f7d34bd237
commit
726fc3b524
3 changed files with 218 additions and 0 deletions
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@ -14,6 +14,7 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
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gstv4l2videodec.c \
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gstv4l2vidorient.c \
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v4l2_calls.c \
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v4l2-utils.c \
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tuner.c \
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tunerchannel.c \
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tunernorm.c
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@ -52,6 +53,7 @@ noinst_HEADERS = \
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gstv4l2videodec.h \
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gstv4l2vidorient.h \
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v4l2_calls.h \
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v4l2-utils.h \
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tuner.h \
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tunerchannel.h \
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tunernorm.h
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166
sys/v4l2/v4l2-utils.c
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166
sys/v4l2/v4l2-utils.c
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@ -0,0 +1,166 @@
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/*
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* Copyright (C) 2014 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
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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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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "v4l2-utils.h"
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/**************************/
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/* Common device iterator */
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/**************************/
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#if HAVE_GUDEV
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#include <gudev/gudev.h>
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struct _GstV4l2GUdevIterator
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{
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GstV4l2Iterator parent;
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GList *devices;
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GUdevDevice *device;
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GUdevClient *client;
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};
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GstV4l2Iterator *
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gst_v4l2_iterator_new (void)
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{
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static const gchar *subsystems[] = { "video4linux", NULL };
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struct _GstV4l2GUdevIterator *it;
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it = g_slice_new0 (struct _GstV4l2GUdevIterator);
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it->client = g_udev_client_new (subsystems);
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it->devices = g_udev_client_query_by_subsystem (it->client, "video4linux");
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return (GstV4l2Iterator *) it;
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}
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gboolean
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gst_v4l2_iterator_next (GstV4l2Iterator * _it)
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{
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struct _GstV4l2GUdevIterator *it = (struct _GstV4l2GUdevIterator *) _it;
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const gchar *device_name;
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if (it->device)
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g_object_unref (it->device);
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it->device = NULL;
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it->parent.device_path = NULL;
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it->parent.device_name = NULL;
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if (it->devices == NULL)
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return FALSE;
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it->device = it->devices->data;
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it->devices = g_list_delete_link (it->devices, it->devices);
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device_name = g_udev_device_get_property (it->device, "ID_V4L_PRODUCT");
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if (!device_name)
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device_name = g_udev_device_get_property (it->device, "ID_MODEL_ENC");
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if (!device_name)
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device_name = g_udev_device_get_property (it->device, "ID_MODEL");
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it->parent.device_path = g_udev_device_get_device_file (it->device);
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it->parent.device_name = device_name;
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it->parent.sys_path = g_udev_device_get_sysfs_path (it->device);
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return TRUE;
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}
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void
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gst_v4l2_iterator_free (GstV4l2Iterator * _it)
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{
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struct _GstV4l2GUdevIterator *it = (struct _GstV4l2GUdevIterator *) _it;
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g_list_free_full (it->devices, g_object_unref);
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gst_object_unref (it->client);
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g_slice_free (struct _GstV4l2GUdevIterator, it);
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}
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#else /* No GUDEV */
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struct _GstV4l2FsIterator
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{
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GstV4l2Iterator parent;
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gint base_idx;
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gint video_idx;
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gchar *device;
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};
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GstV4l2Iterator *
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gst_v4l2_iterator_new (void)
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{
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struct _GstV4l2FsIterator *it;
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it = g_slice_new0 (struct _GstV4l2FsIterator);
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it->base_idx = 0;
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it->video_idx = -1;
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it->device = NULL;
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return (GstV4l2Iterator *) it;
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}
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gboolean
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gst_v4l2_iterator_next (GstV4l2Iterator * _it)
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{
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struct _GstV4l2FsIterator *it = (struct _GstV4l2FsIterator *) _it;
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static const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
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gchar *device = NULL;
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g_free ((gchar *) it->parent.device_path);
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it->parent.device_path = NULL;
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while (device == NULL) {
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it->video_idx++;
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if (it->video_idx >= 64) {
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it->video_idx = 0;
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it->base_idx++;
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}
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if (dev_base[it->base_idx] == NULL) {
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it->video_idx = 0;
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break;
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}
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device = g_strdup_printf ("%s%d", dev_base[it->base_idx], it->video_idx);
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if (g_file_test (device, G_FILE_TEST_EXISTS)) {
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it->parent.device_path = device;
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break;
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}
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g_free (device);
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device = NULL;
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}
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return it->parent.device_path != NULL;
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}
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void
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gst_v4l2_iterator_free (GstV4l2Iterator * _it)
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{
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struct _GstV4l2FsIterator *it = (struct _GstV4l2FsIterator *) _it;
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g_free ((gchar *) it->parent.device_path);
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g_slice_free (struct _GstV4l2FsIterator, it);
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}
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#endif
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50
sys/v4l2/v4l2-utils.h
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50
sys/v4l2/v4l2-utils.h
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@ -0,0 +1,50 @@
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/*
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* Copyright (C) 2014 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
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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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*/
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#ifndef __V4L2_UTILS_H__
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#define __V4L2_UTILS_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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typedef struct _GstV4l2Iterator GstV4l2Iterator;
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struct _GstV4l2Iterator
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{
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const gchar *device_path;
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const gchar *device_name;
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const gchar *sys_path;
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};
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GstV4l2Iterator * gst_v4l2_iterator_new (void);
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gboolean gst_v4l2_iterator_next (GstV4l2Iterator *it);
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void gst_v4l2_iterator_free (GstV4l2Iterator *it);
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const gchar * gst_v4l2_iterator_get_device_path (GstV4l2Iterator *it);
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const gchar * gst_v4l2_iterator_get_device_name (GstV4l2Iterator *it);
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const gchar * gst_v4l2_iterator_get_sys_path (GstV4l2Iterator *it);
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G_END_DECLS
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#endif /* __V4L2_UTILS_H__ */
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