tensordecoders: Move decoder out of the ONNX plugin

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6000>

subprojects/gst-plugins-bad/docs/plugins/gst_plugins_cache.json

@@ -245050,6 +245050,86 @@
         "tracers": {},
         "url": "Unknown package origin"
     },
+    "tensordecoders": {
+        "description": "Tensor decoders elements",
+        "elements": {
+            "ssdobjectdetector": {
+                "author": "Aaron Boxer <aaron.boxer@collabora.com>, Marcus Edel <marcus.edel@collabora.com>",
+                "description": "Apply tensor output from inference to detect objects in video frames",
+                "hierarchy": [
+                    "GstSsdObjectDetector",
+                    "GstBaseTransform",
+                    "GstElement",
+                    "GstObject",
+                    "GInitiallyUnowned",
+                    "GObject"
+                ],
+                "klass": "TensorDecoder/Video",
+                "pad-templates": {
+                    "sink": {
+                        "caps": "video/x-raw:\n",
+                        "direction": "sink",
+                        "presence": "always"
+                    },
+                    "src": {
+                        "caps": "video/x-raw:\n",
+                        "direction": "src",
+                        "presence": "always"
+                    }
+                },
+                "properties": {
+                    "label-file": {
+                        "blurb": "Label file",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "NULL",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gchararray",
+                        "writable": true
+                    },
+                    "score-threshold": {
+                        "blurb": "Threshold for deciding when to remove boxes based on score",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "0.3",
+                        "max": "1",
+                        "min": "0",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gfloat",
+                        "writable": true
+                    },
+                    "size-threshold": {
+                        "blurb": "Threshold for deciding when to remove boxes based on proportion of the image",
+                        "conditionally-available": false,
+                        "construct": false,
+                        "construct-only": false,
+                        "controllable": false,
+                        "default": "0.9",
+                        "max": "1",
+                        "min": "0",
+                        "mutable": "null",
+                        "readable": true,
+                        "type": "gfloat",
+                        "writable": true
+                    }
+                },
+                "rank": "primary"
+            }
+        },
+        "filename": "gsttensordecoders",
+        "license": "LGPL",
+        "other-types": {},
+        "package": "GStreamer Bad Plug-ins",
+        "source": "gst-plugins-bad",
+        "tracers": {},
+        "url": "Unknown package origin"
+    },
     "timecode": {
         "description": "Timecode-related elements",
         "elements": {

subprojects/gst-plugins-bad/ext/onnx/gstonnx.c

@@ -24,16 +24,12 @@
 #include "config.h"
 #endif
 
-#include "decoders/gstssdobjectdetector.h"
 #include "gstonnxinference.h"
 
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
-  gboolean success = GST_ELEMENT_REGISTER (ssd_object_detector, plugin);
+  return GST_ELEMENT_REGISTER (onnx_inference, plugin);
-  success |= GST_ELEMENT_REGISTER (onnx_inference, plugin);
-
-  return success;
 }
 
 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

subprojects/gst-plugins-bad/ext/onnx/meson.build

@@ -15,7 +15,6 @@ endif
 if onnxrt_dep.found()
     gstonnx = library('gstonnx',
     'gstonnx.c',
-    'decoders/gstssdobjectdetector.c',
     'gstonnxinference.cpp',
     'gstonnxclient.cpp',
     c_args : gst_plugins_bad_args + extra_args,
@@ -23,7 +22,7 @@ if onnxrt_dep.found()
     link_args : noseh_link_args,
     include_directories : [configinc, libsinc, cuda_stubinc],
     dependencies : [gstbase_dep, gstvideo_dep, gstanalytics_dep, onnxrt_dep,
-        libm, gio_dep] + extra_deps,
+        libm] + extra_deps,
     install : true,
     install_dir : plugins_install_dir,
   )

subprojects/gst-plugins-bad/gst/meson.build

@@ -11,7 +11,7 @@ foreach plugin : ['accurip', 'adpcmdec', 'adpcmenc', 'aiff', 'asfmux',
                   'mse', 'mxf', 'netsim', 'onvif', 'pcapparse', 'pnm', 'proxy',
                   'rawparse', 'removesilence', 'rist', 'rtmp2', 'rtp', 'sdp',
                   'segmentclip', 'siren', 'smooth', 'speed', 'subenc', 'switchbin',
-                  'timecode', 'transcode', 'unixfd', 'videofilters',
+                  'tensordecoders', 'timecode', 'transcode', 'unixfd', 'videofilters',
                   'videoframe_audiolevel', 'videoparsers', 'videosignal',
                   'vmnc', 'y4m']
   if not get_option(plugin).disabled()

subprojects/gst-plugins-bad/gst/tensordecoders/gstssdobjectdetector.c

@@ -2,7 +2,7 @@
  * GStreamer gstreamer-ssdobjectdetector
  * Copyright (C) 2021 Collabora Ltd.
  *
- * gstssdobjectdetector.cpp
+ * gstssdobjectdetector.c
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public

subprojects/gst-plugins-bad/gst/tensordecoders/gsttensordecoders.c

@@ -0,0 +1,49 @@
+/* GStreamer object detection overlay
+ * Copyright (C) <2024> Collabora Ltd.
+ *  @author: Daniel Morin <daniel.morin@collabora.com>
+ *
+ * gsttensordecoders.c
+ *
+ * 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
+
+#include "gstssdobjectdetector.h"
+
+/**
+ * SECTION:plugin-tensordecoders
+ *
+ * Tensor decoders
+ *
+ * Since: 1.26
+ */
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  gboolean ret = FALSE;
+  ret |= GST_ELEMENT_REGISTER (ssd_object_detector, plugin);
+
+  return ret;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    tensordecoders,
+    "Tensor decoders elements",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

subprojects/gst-plugins-bad/gst/tensordecoders/meson.build

@@ -0,0 +1,14 @@
+tensordecoders_sources = [
+  'gsttensordecoders.c',
+  'gstssdobjectdetector.c'
+]
+
+gsttensordecoders = library('gsttensordecoders',
+  tensordecoders_sources,
+  c_args : gst_plugins_bad_args,
+  include_directories : [configinc],
+  dependencies : [gstbase_dep, gstvideo_dep, gstanalytics_dep, gio_dep, libm],
+  install : true,
+  install_dir : plugins_install_dir,
+)
+plugins += [gsttensordecoders]

subprojects/gst-plugins-bad/meson_options.txt

@@ -67,6 +67,7 @@ option('smooth', type : 'feature', value : 'auto')
 option('speed', type : 'feature', value : 'auto')
 option('subenc', type : 'feature', value : 'auto')
 option('switchbin', type : 'feature', value : 'auto')
+option('tensordecoders', type : 'feature', value : 'auto')
 option('timecode', type : 'feature', value : 'auto')
 option('unixfd', type : 'feature', value : 'auto')
 option('videofilters', type : 'feature', value : 'auto')