mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-26 19:51:11 +00:00
v4l2codecs: Add device enumeration
This introduces a GstV4L2CodecDevice structure and helper to retrieve a list of CODEC device drivers. In order to find the device driver we enumerate all media devices with UDEV. We then get the media controller topology and locate a entity with function encoder or decoder and make sure it is linked to two V4L2 IO entity pointing to the same device node.
This commit is contained in:
Nicolas Dufresne
parent
6958fb6d59
commit
6d9c98ae5a
5 changed files with 461 additions and 11 deletions
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@ -165,6 +165,7 @@ option('zbar', type : 'feature', value : 'auto', description : 'Barcode image sc
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option('zxing', type : 'feature', value : 'auto', description : 'Barcode image scanner plugin using zxing-cpp library')
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option('wpe', type : 'feature', value : 'auto', description : 'WPE Web browser plugin')
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option('magicleap', type : 'feature', value : 'auto', description : 'Magic Leap platform support')
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option('v4l2codecs', type : 'feature', value : 'auto', description : 'Video4Linux Stateless CODECs support')
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# HLS plugin options
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option('hls', type : 'feature', value : 'auto', description : 'HTTP Live Streaming plugin')
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396
sys/v4l2codecs/gstv4l2codecdevice.c
Normal file
396
sys/v4l2codecs/gstv4l2codecdevice.c
Normal file
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@ -0,0 +1,396 @@
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/* GStreamer
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* Copyright (C) 2020 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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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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#include "gstv4l2codecdevice.h"
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#include "linux/media.h"
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#include <fcntl.h>
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#include <gudev/gudev.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#define GST_CAT_DEFAULT gstv4l2codecs_debug
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GST_DEBUG_CATEGORY_EXTERN (gstv4l2codecs_debug);
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GType _gst_v4l2_codec_device_type = 0;
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GST_DEFINE_MINI_OBJECT_TYPE (GstV4l2CodecDevice, gst_v4l2_codec_device);
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static void
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gst_v4l2_codec_device_free (GstV4l2CodecDevice * device)
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{
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g_free (device->name);
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g_free (device->media_device_path);
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g_free (device->video_device_path);
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g_free (device);
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}
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static GstV4l2CodecDevice *
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gst_v4l2_codec_device_new (const gchar * name, guint32 function,
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const gchar * media_device_path, const gchar * video_device_path)
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{
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GstV4l2CodecDevice *device = g_new0 (GstV4l2CodecDevice, 1);
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gst_mini_object_init (GST_MINI_OBJECT_CAST (device),
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0, _gst_v4l2_codec_device_type, NULL, NULL,
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(GstMiniObjectFreeFunction) gst_v4l2_codec_device_free);
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device->name = g_strdup (name);
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device->function = function;
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device->media_device_path = g_strdup (media_device_path);
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device->video_device_path = g_strdup (video_device_path);
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return device;
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}
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static void
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clear_topology (struct media_v2_topology *topology)
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{
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g_free ((gpointer) (gsize) topology->ptr_entities);
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g_free ((gpointer) (gsize) topology->ptr_interfaces);
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g_free ((gpointer) (gsize) topology->ptr_pads);
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g_free ((gpointer) (gsize) topology->ptr_links);
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memset (topology, 0, sizeof (struct media_v2_topology));
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}
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static gboolean
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get_topology (gint fd, struct media_v2_topology *topology)
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{
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gint ret;
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guint64 version;
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again:
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memset (topology, 0, sizeof (struct media_v2_topology));
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ret = ioctl (fd, MEDIA_IOC_G_TOPOLOGY, topology);
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if (ret < 0) {
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GST_WARNING ("Could not retrieve topology: %s", g_strerror (errno));
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return FALSE;
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}
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version = topology->topology_version;
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topology->ptr_entities = (guint64) (gsize)
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g_new0 (struct media_v2_entity, topology->num_entities);
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topology->ptr_interfaces = (guint64) (gsize)
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g_new0 (struct media_v2_interface, topology->num_interfaces);
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topology->ptr_pads = (guint64) (gsize)
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g_new0 (struct media_v2_pad, topology->num_pads);
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topology->ptr_links = (guint64) (gsize)
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g_new0 (struct media_v2_link, topology->num_links);
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ret = ioctl (fd, MEDIA_IOC_G_TOPOLOGY, topology);
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if (ret < 0) {
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GST_WARNING ("Could not retrieve topology: %s", g_strerror (errno));
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clear_topology (topology);
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return FALSE;
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}
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/* If the topology have changed, just retry */
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if (version != topology->topology_version) {
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clear_topology (topology);
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goto again;
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}
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return TRUE;
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}
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static struct media_v2_entity *
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find_v4l_entity (struct media_v2_topology *topology, guint32 id)
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{
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gint i;
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for (i = 0; i < topology->num_entities; i++) {
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struct media_v2_entity *entity =
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((struct media_v2_entity *) (gsize) topology->ptr_entities) + i;
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if (entity->function != MEDIA_ENT_F_IO_V4L)
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continue;
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if (entity->id == id)
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return entity;
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}
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return NULL;
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}
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static struct media_v2_pad *
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find_pad (struct media_v2_topology *topology, guint32 id)
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{
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gint i;
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for (i = 0; i < topology->num_pads; i++) {
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struct media_v2_pad *pad =
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((struct media_v2_pad *) (gsize) topology->ptr_pads) + i;
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if (pad->id == id)
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return pad;
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}
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return NULL;
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}
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static GList *
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find_codec_entity (struct media_v2_topology *topology)
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{
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GQueue entities = G_QUEUE_INIT;
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gint i;
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for (i = 0; i < topology->num_entities; i++) {
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struct media_v2_entity *entity =
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((struct media_v2_entity *) (gsize) topology->ptr_entities) + i;
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switch (entity->function) {
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case MEDIA_ENT_F_PROC_VIDEO_ENCODER:
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case MEDIA_ENT_F_PROC_VIDEO_DECODER:
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g_queue_push_tail (&entities, entity);
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break;
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default:
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break;
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}
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}
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return entities.head;
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}
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static gboolean
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find_codec_entity_pads (struct media_v2_topology *topology,
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struct media_v2_entity *entity, struct media_v2_pad **sink_pad,
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struct media_v2_pad **source_pad)
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{
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gint i;
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*sink_pad = NULL;
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*source_pad = NULL;
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for (i = 0; i < topology->num_pads; i++) {
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struct media_v2_pad *pad =
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((struct media_v2_pad *) (gsize) topology->ptr_pads) + i;
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if (pad->entity_id != entity->id)
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continue;
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if (pad->flags & MEDIA_PAD_FL_SINK) {
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if (*sink_pad)
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return FALSE;
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*sink_pad = pad;
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} else if (pad->flags & MEDIA_PAD_FL_SOURCE) {
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if (*source_pad)
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return FALSE;
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*source_pad = pad;
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} else {
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/* unknown pad type */
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return FALSE;
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}
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}
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return (*source_pad && *sink_pad);
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}
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static struct media_v2_entity *
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find_peer_v4l_entity (struct media_v2_topology *topology,
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struct media_v2_pad *pad)
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{
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struct media_v2_pad *peer_pad = NULL;
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gint i;
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for (i = 0; i < topology->num_links; i++) {
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struct media_v2_link *link =
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((struct media_v2_link *) (gsize) topology->ptr_links) + i;
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if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) != MEDIA_LNK_FL_DATA_LINK)
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continue;
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if ((link->flags & (MEDIA_LNK_FL_IMMUTABLE)) == 0)
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continue;
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if ((link->flags & (MEDIA_LNK_FL_ENABLED)) == 0)
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continue;
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if (pad->flags & MEDIA_PAD_FL_SINK && link->sink_id == pad->id)
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peer_pad = find_pad (topology, link->source_id);
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else if (pad->flags & MEDIA_PAD_FL_SOURCE && link->source_id == pad->id)
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peer_pad = find_pad (topology, link->sink_id);
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if (peer_pad)
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break;
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}
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if (peer_pad)
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return find_v4l_entity (topology, peer_pad->entity_id);
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return NULL;
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}
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static struct media_v2_interface *
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find_video_interface (struct media_v2_topology *topology, guint32 id)
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{
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gint i;
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for (i = 0; i < topology->num_interfaces; i++) {
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struct media_v2_interface *intf =
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((struct media_v2_interface *) (gsize) topology->ptr_interfaces) + i;
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if (intf->intf_type != MEDIA_INTF_T_V4L_VIDEO)
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continue;
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if (intf->id == id)
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return intf;
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}
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return NULL;
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}
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static struct media_v2_intf_devnode *
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find_video_devnode (struct media_v2_topology *topology,
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struct media_v2_entity *entity)
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{
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gint i;
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for (i = 0; i < topology->num_links; i++) {
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struct media_v2_link *link =
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((struct media_v2_link *) (gsize) topology->ptr_links) + i;
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struct media_v2_interface *intf;
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if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) != MEDIA_LNK_FL_INTERFACE_LINK)
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continue;
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if (link->sink_id != entity->id)
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continue;
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intf = find_video_interface (topology, link->source_id);
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if (intf)
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return &intf->devnode;
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}
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return NULL;
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}
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static inline const gchar *
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function_to_string (guint32 function)
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{
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switch (function) {
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case MEDIA_ENT_F_PROC_VIDEO_ENCODER:
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return "encoder";
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case MEDIA_ENT_F_PROC_VIDEO_DECODER:
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return "decoder";
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default:
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break;
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}
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return "unknown";
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}
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GList *
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gst_v4l2_codec_find_devices (void)
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{
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GUdevClient *client;
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GList *udev_devices, *d;
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GQueue devices = G_QUEUE_INIT;
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client = g_udev_client_new (NULL);
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udev_devices = g_udev_client_query_by_subsystem (client, "media");
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for (d = udev_devices; d; d = g_list_next (d)) {
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GUdevDevice *udev = (GUdevDevice *) d->data;
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const gchar *path = g_udev_device_get_device_file (udev);
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gint fd;
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struct media_v2_topology topology;
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GList *codec_entities, *c;
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fd = open (path, 0);
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if (fd < 0)
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continue;
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GST_DEBUG ("Analysing media device '%s'", path);
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if (!get_topology (fd, &topology)) {
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clear_topology (&topology);
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continue;
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}
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codec_entities = find_codec_entity (&topology);
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if (!codec_entities) {
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clear_topology (&topology);
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continue;
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}
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GST_DEBUG ("Found CODEC entities");
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for (c = codec_entities; c; c = g_list_next (c)) {
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struct media_v2_entity *entity = (struct media_v2_entity *) c->data;
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struct media_v2_pad *source_pad;
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struct media_v2_pad *sink_pad;
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struct media_v2_entity *source_entity, *sink_entity;
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struct media_v2_intf_devnode *source_dev, *sink_dev;
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GUdevDevice *v4l2_udev;
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GST_DEBUG ("Analysing entity %s", entity->name);
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if (!find_codec_entity_pads (&topology, entity, &sink_pad, &source_pad))
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continue;
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GST_DEBUG ("Found source and sink pads");
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source_entity = find_peer_v4l_entity (&topology, sink_pad);
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sink_entity = find_peer_v4l_entity (&topology, source_pad);
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if (!source_entity || !sink_entity)
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continue;
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GST_DEBUG ("Found source and sink V4L IO entities");
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source_dev = find_video_devnode (&topology, source_entity);
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sink_dev = find_video_devnode (&topology, source_entity);
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if (!source_dev || !sink_dev)
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continue;
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if (source_dev->major != sink_dev->major
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|| source_dev->minor != sink_dev->minor)
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continue;
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v4l2_udev = g_udev_client_query_by_device_number (client,
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G_UDEV_DEVICE_TYPE_CHAR,
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makedev (source_dev->major, source_dev->minor));
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if (!v4l2_udev)
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continue;
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GST_INFO ("Found %s device %s", function_to_string (entity->function),
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entity->name);
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g_queue_push_tail (&devices,
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gst_v4l2_codec_device_new (entity->name, entity->function, path,
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g_udev_device_get_device_file (v4l2_udev)));
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g_object_unref (v4l2_udev);
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}
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clear_topology (&topology);
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g_list_free (codec_entities);
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}
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g_list_free_full (udev_devices, g_object_unref);
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g_object_unref (client);
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return devices.head;
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}
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void
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gst_v4l2_codec_device_list_free (GList * devices)
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{
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g_list_free_full (devices, (GDestroyNotify) gst_mini_object_unref);
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}
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43
sys/v4l2codecs/gstv4l2codecdevice.h
Normal file
43
sys/v4l2codecs/gstv4l2codecdevice.h
Normal file
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@ -0,0 +1,43 @@
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/* GStreamer
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* Copyright (C) 2020 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
|
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*
|
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* 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,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _GST_V4L2_CODEC_DEVICE_H_
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#define _GST_V4L2_CODEC_DEVICE_H_
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#include <gst/gst.h>
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#define GST_TYPE_V4L2_CODEC_DEVICE (_gst_v4l2_codec_device_type)
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#define GST_IS_V4L2_CODEC_DEVICE(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_V4L2_CODEC_DEVICE))
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#define GST_V4L2_CODEC_DEVICE(obj) ((GstV4l2CodecDevice *)(obj))
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typedef struct {
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GstMiniObject mini_object;
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gchar *name;
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guint32 function;
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gchar *media_device_path;
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gchar *video_device_path;
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} GstV4l2CodecDevice;
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GType gst_v4l2_codec_device_get_type (void);
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GList *gst_v4l2_codec_find_devices (void);
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void gst_v4l2_codec_device_list_free (GList *devices);
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#endif /* _GST_V4L2_CODECS_DEVICE_H_ */
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|
|
@ -1,15 +1,20 @@
|
|||
v4l2codecs_sources = [
|
||||
'plugin.c',
|
||||
'gstv4l2codecdevice.c',
|
||||
]
|
||||
|
||||
gstv4l2codecs = library('gstv4l2codecs',
|
||||
libgudev_dep = dependency('gudev-1.0', required: get_option('v4l2codecs'))
|
||||
|
||||
if libgudev_dep.found()
|
||||
gstv4l2codecs = library('gstv4l2codecs',
|
||||
v4l2codecs_sources,
|
||||
c_args : gst_plugins_bad_args,
|
||||
cpp_args: gst_plugins_bad_args,
|
||||
include_directories : [configinc],
|
||||
dependencies : [gstbase_dep, gstcodecs_dep],
|
||||
dependencies : [gstbase_dep, gstcodecs_dep, libgudev_dep],
|
||||
install : true,
|
||||
install_dir : plugins_install_dir,
|
||||
)
|
||||
pkgconfig.generate(gstv4l2codecs, install_dir : plugins_pkgconfig_install_dir)
|
||||
plugins += [gstv4l2codecs]
|
||||
)
|
||||
pkgconfig.generate(gstv4l2codecs, install_dir : plugins_pkgconfig_install_dir)
|
||||
plugins += [gstv4l2codecs]
|
||||
endif
|
||||
|
|
|
|||
|
|
@ -24,9 +24,14 @@
|
|||
|
||||
#include <gst/gst.h>
|
||||
|
||||
#define GST_CAT_DEFAULT gstv4l2codecs_debug
|
||||
GST_DEBUG_CATEGORY (gstv4l2codecs_debug);
|
||||
|
||||
static gboolean
|
||||
plugin_init (GstPlugin * plugin)
|
||||
{
|
||||
GST_DEBUG_CATEGORY_INIT (gstv4l2codecs_debug, "v4l2codecs", 0,
|
||||
"V4L2 CODECs general debug");
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue