binding: gstreamer: initial commit of gstreamer support

Add AGL gstreamer binding to control audio media independent
outside of QT or respective UX interface.

Bug-AGL: SPEC-931
Change-Id: Id1d0ccb1be3ab0d4111eb367d01ff2e6c4e040e0
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>

4 files changed, 799 insertions, 0 deletions

diff --git a/binding/CMakeLists.txt b/binding/CMakeLists.txt
new file mode 100644
index 0000000..8b99ac0
--- /dev/null
+++ b/binding/CMakeLists.txt
@@ -0,0 +1,41 @@
+###########################################################################
+# Copyright 2015, 2016, 2017 IoT.bzh
+#
+# author: Fulup Ar Foll <fulup@iot.bzh>
+# contrib: Romain Forlot <romain.forlot@iot.bzh>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+###########################################################################
+
+# Add target to project dependency list
+PROJECT_TARGET_ADD(afm-gstreamer-binding)
+
+	# Define project Targets
+	add_library(afm-gstreamer-binding MODULE
+		afm-gstreamer-binding.c
+		afm-common.c)
+
+	# Binder exposes a unique public entry point
+	SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+		LABELS "BINDING"
+		LINK_FLAGS ${BINDINGS_LINK_FLAG}
+		OUTPUT_NAME ${TARGET_NAME}
+	)
+
+	# Library dependencies (include updates automatically)
+	TARGET_LINK_LIBRARIES(${TARGET_NAME} ${link_libraries})
+
+	# installation directory
+	INSTALL(TARGETS ${TARGET_NAME}
+		LIBRARY DESTINATION ${BINDINGS_INSTALL_DIR})
+
diff --git a/binding/afm-common.c b/binding/afm-common.c
new file mode 100644
index 0000000..3f0f38e
--- /dev/null
+++ b/binding/afm-common.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include "afm-common.h"
+
+const char *control_commands[] = {
+	"play",
+	"pause",
+	"previous",
+	"next",
+	"seek",
+	"fast-forward",
+	"rewind",
+	"pick-track",
+	"volume",
+};
+
+int get_command_index(const char *name)
+{
+	int i;
+
+	if (name == NULL)
+		return -EINVAL;
+
+	for (i = 0; i < NUM_CMDS; i++) {
+		if (!strcasecmp(control_commands[i], name))
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+GList *find_media_index(GList *list, long int index)
+{
+	struct playlist_item *item;
+	GList *l;
+
+	for (l = list; l; l = l->next) {
+		item = l->data;
+
+		if (!item)
+			continue;
+
+		if (item->id == index)
+			return l;
+	}
+
+	return NULL;
+}
+
+void g_free_playlist_item(void *ptr)
+{
+	struct playlist_item *item = ptr;
+
+	if (ptr == NULL)
+		return;
+
+	g_free(item->title);
+	g_free(item->album);
+	g_free(item->artist);
+	g_free(item->genre);
+	g_free(item->media_path);
+	g_free(item);
+}
diff --git a/binding/afm-common.h b/binding/afm-common.h
new file mode 100644
index 0000000..8a418a1
--- /dev/null
+++ b/binding/afm-common.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef _AFM_COMMON_H
+#define _AFM_COMMON_H
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <glib.h>
+#include <json-c/json.h>
+
+struct playlist_item {
+    int id;
+    gchar *title;
+    gchar *album;
+    gchar *artist;
+    gchar *genre;
+    gint64 duration;
+    gchar *media_path;
+};
+
+enum {
+    PLAY_CMD = 0,
+    PAUSE_CMD,
+    PREVIOUS_CMD,
+    NEXT_CMD,
+    SEEK_CMD,
+    FASTFORWARD_CMD,
+    REWIND_CMD,
+    PICKTRACK_CMD,
+    VOLUME_CMD,
+    NUM_CMDS
+};
+
+const char *control_commands[NUM_CMDS];
+int get_command_index(const char *name);
+GList *find_media_index(GList *list, long int index);
+void g_free_playlist_item(void *ptr);
+
+#endif /* _AFM_COMMON_H */
diff --git a/binding/afm-gstreamer-binding.c b/binding/afm-gstreamer-binding.c
new file mode 100644
index 0000000..b168ccc
--- /dev/null
+++ b/binding/afm-gstreamer-binding.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright (C) 2017 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <glib.h>
+#include <pthread.h>
+#include <gst/gst.h>
+#include <json-c/json.h>
+#include "afm-common.h"
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+static struct afb_event gstreamer_event;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static GList *playlist = NULL;
+static GList *current_track = NULL;
+
+typedef struct _CustomData {
+	GstElement *playbin;
+	gboolean playing;
+	guint volume;
+	gint64 position;
+	gint64 duration;
+} CustomData;
+
+CustomData data = {
+	.volume = 50,
+	.position = GST_CLOCK_TIME_NONE,
+	.duration = GST_CLOCK_TIME_NONE,
+};
+
+static json_object *populate_json(struct playlist_item *track)
+{
+	json_object *jresp = json_object_new_object();
+	json_object *jstring = json_object_new_string(track->media_path);
+	json_object_object_add(jresp, "path", jstring);
+
+	if (track->title) {
+		jstring = json_object_new_string(track->title);
+		json_object_object_add(jresp, "title", jstring);
+	}
+
+	if (track->album) {
+		jstring = json_object_new_string(track->album);
+		json_object_object_add(jresp, "album", jstring);
+	}
+
+	if (track->artist) {
+		jstring = json_object_new_string(track->artist);
+		json_object_object_add(jresp, "artist", jstring);
+	}
+
+	if (track->genre) {
+		jstring = json_object_new_string(track->genre);
+		json_object_object_add(jresp, "genre", jstring);
+	}
+
+	if (track->duration > 0)
+		json_object_object_add(jresp, "duration",
+			       json_object_new_int64(track->duration));
+
+	json_object_object_add(jresp, "index",
+			       json_object_new_int(track->id));
+
+	return jresp;
+}
+
+static gboolean populate_from_json(struct playlist_item *item, json_object *jdict)
+{
+	gboolean ret;
+	json_object *val = NULL;
+
+	ret = json_object_object_get_ex(jdict, "path", &val);
+	if (!ret)
+		return ret;
+	item->media_path = g_strdup(json_object_get_string(val));
+
+	ret = json_object_object_get_ex(jdict, "title", &val);
+	if (ret) {
+		item->title = g_strdup(json_object_get_string(val));
+	}
+
+	ret = json_object_object_get_ex(jdict, "album", &val);
+	if (ret) {
+		item->album = g_strdup(json_object_get_string(val));
+	}
+
+	ret = json_object_object_get_ex(jdict, "artist", &val);
+	if (ret) {
+		item->artist = g_strdup(json_object_get_string(val));
+	}
+
+	ret = json_object_object_get_ex(jdict, "genre", &val);
+	if (ret) {
+		item->genre = g_strdup(json_object_get_string(val));
+	}
+
+	ret = json_object_object_get_ex(jdict, "duration", &val);
+	if (ret) {
+		item->duration = json_object_get_int64(val);
+	}
+
+	return TRUE;
+}
+
+static int set_media_uri(struct playlist_item *item)
+{
+	if (!item || !item->media_path)
+		return -ENOENT;
+
+	gst_element_set_state(data.playbin, GST_STATE_NULL);
+
+	g_object_set(data.playbin, "uri", item->media_path, NULL);
+
+	data.position = GST_CLOCK_TIME_NONE;
+	data.duration = GST_CLOCK_TIME_NONE;
+
+	if (data.playing)
+		gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+
+	g_object_set(data.playbin, "volume", data.volume / 100.0, NULL);
+
+	return 0;
+}
+
+static void populate_playlist(json_object *jquery)
+{
+	int i, idx = 0;
+	GList *list = g_list_last(playlist);
+
+	if (list && list->data) {
+		struct playlist_item *item = list->data;
+		idx = item->id + 1;
+	}
+
+	for (i = 0; i < json_object_array_length(jquery); i++) {
+		json_object *jdict = json_object_array_get_idx(jquery, i);
+		struct playlist_item *item = g_malloc0(sizeof(*item));
+		int ret;
+
+		if (item == NULL)
+			break;
+
+		ret = populate_from_json(item, jdict);
+		if (!ret) {
+			g_free_playlist_item(item);
+			continue;
+		}
+
+		item->id = idx++;
+		playlist = g_list_append(playlist, item);
+	}
+
+	current_track = g_list_first(playlist);
+	set_media_uri(current_track->data);
+}
+
+static void audio_playlist(struct afb_req request)
+{
+	const char *value = afb_req_value(request, "list");
+	json_object *jresp = NULL;
+
+	pthread_mutex_lock(&mutex);
+
+	if (value) {
+		json_object *jquery;
+
+		if (playlist) {
+			g_list_free_full(playlist, g_free_playlist_item);
+			playlist = NULL;
+		}
+
+		jquery = json_tokener_parse(value);
+		populate_playlist(jquery);
+
+		if (playlist == NULL)
+	        afb_req_fail(request, "failed", "invalid playlist");
+		else
+			afb_req_success(request, NULL, NULL);
+
+		json_object_put(jquery);
+	} else {
+		GList *l;
+		json_object *jarray = json_object_new_array();
+		jresp = json_object_new_object();
+
+		for (l = playlist; l; l = l->next) {
+			json_object *item = populate_json(l->data);
+			json_object_array_add(jarray, item);
+		}
+
+		json_object_object_add(jresp, "list", jarray);
+		afb_req_success(request, jresp, "Playlist results");
+	}
+
+	pthread_mutex_unlock(&mutex);
+}
+
+static int seek_track(int cmd)
+{
+	GList *item = (cmd == NEXT_CMD) ? current_track->next : current_track->prev;
+	int ret;
+
+	if (item == NULL)
+		return -EINVAL;
+
+	ret = set_media_uri(item->data);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (data.playing)
+		gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+
+	current_track = item;
+
+	return 0;
+}
+
+static int seek_stream(const char *value, int cmd)
+{
+	gint64 position, current = 0;
+
+	if (value == NULL)
+		return -EINVAL;
+
+	position = strtoll(value, NULL, 10);
+
+	if (cmd != SEEK_CMD) {
+		gst_element_query_position (data.playbin, GST_FORMAT_TIME, &current);
+		position = (current / GST_MSECOND) + (FASTFORWARD_CMD ? position : -position);
+	}
+
+	if (position < 0)
+		position = 0;
+
+	if (data.duration > 0 && position > data.duration)
+		position = data.duration;
+
+	return gst_element_seek_simple(data.playbin, GST_FORMAT_TIME,
+				GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
+				position * GST_MSECOND);
+}
+
+/* @value can be one of the following values:
+ *   play     - go to playing transition
+ *   pause    - go to pause transition
+ *   previous - skip to previous track
+ *   next     - skip to the next track
+ *   seek     - go to position (in milliseconds)
+ *
+ *   fast-forward - skip forward in milliseconds
+ *   rewind       - skip backward in milliseconds
+ *
+ *   pick-track   - select track via index number
+ *   volume       - set volume between 0 - 100%
+ */
+
+static void controls(struct afb_req request)
+{
+	const char *value = afb_req_value(request, "value");
+	const char *position = afb_req_value(request, "position");
+	int cmd = get_command_index(value);
+
+	if (!value) {
+		afb_req_fail(request, "failed", "no value was passed");
+		return;
+	}
+
+	pthread_mutex_lock(&mutex);
+	errno = 0;
+
+	switch (cmd) {
+	case PLAY_CMD:
+		gst_element_set_state(data.playbin, GST_STATE_PLAYING);
+		data.playing = TRUE;
+		break;
+	case PAUSE_CMD:
+		gst_element_set_state(data.playbin, GST_STATE_PAUSED);
+		data.playing = FALSE;
+		break;
+	case PREVIOUS_CMD:
+	case NEXT_CMD:
+		seek_track(cmd);
+		break;
+	case SEEK_CMD:
+	case FASTFORWARD_CMD:
+	case REWIND_CMD:
+		seek_stream(position, cmd);
+		break;
+	case PICKTRACK_CMD: {
+		const char *parameter = afb_req_value(request, "index");
+		long int idx = strtol(parameter, NULL, 10);
+		GList *list = NULL;
+
+		if (idx == 0 && !errno) {
+			afb_req_fail(request, "failed", "invalid index");
+			pthread_mutex_unlock(&mutex);
+			return;
+		}
+
+		list = find_media_index(playlist, idx);
+		if (list != NULL) {
+			struct playlist_item *item = list->data;
+			set_media_uri(item);
+			current_track = list;
+		} else {
+			afb_req_fail(request, "failed", "couldn't find index");
+			pthread_mutex_unlock(&mutex);
+			return;
+		}
+
+		break;
+	}
+	case VOLUME_CMD: {
+		const char *parameter = afb_req_value(request, "volume");
+		long int volume = strtol(parameter, NULL, 10);
+
+		if (volume == 0 && !errno) {
+			afb_req_fail(request, "failed", "invalid volume");
+			pthread_mutex_unlock(&mutex);
+			return;
+		}
+
+		if (volume < 0)
+			volume = 0;
+		if (volume > 100)
+			volume = 100;
+
+		g_object_set(data.playbin, "volume", volume / 100.0, NULL);
+
+		break;
+	}
+	default:
+		afb_req_fail(request, "failed", "unknown command");
+		pthread_mutex_unlock(&mutex);
+		return;
+	}
+
+	afb_req_success(request, NULL, NULL);
+	pthread_mutex_unlock(&mutex);
+}
+
+static void metadata(struct afb_req request)
+{
+	struct playlist_item *track;
+	json_object *jresp;
+
+	pthread_mutex_lock(&mutex);
+
+	if (current_track == NULL || current_track->data == NULL) {
+		afb_req_fail(request, "failed", "No playlist");
+		pthread_mutex_unlock(&mutex);
+		return;
+	}
+
+	track = current_track->data;
+	jresp = populate_json(track);
+
+	if (data.duration != GST_CLOCK_TIME_NONE)
+		json_object_object_add(jresp, "duration",
+			       json_object_new_int64(data.duration / GST_MSECOND));
+
+	if (data.position != GST_CLOCK_TIME_NONE)
+		json_object_object_add(jresp, "position",
+			       json_object_new_int64(data.position / GST_MSECOND));
+
+	json_object_object_add(jresp, "volume",
+			       json_object_new_int(data.volume));
+
+	pthread_mutex_unlock(&mutex);
+
+	afb_req_success(request, jresp, "Metadata results");
+}
+
+static void subscribe(struct afb_req request)
+{
+	const char *value = afb_req_value(request, "value");
+
+	if (value && !strcasecmp(value, "gstreamer")) {
+		afb_req_subscribe(request, gstreamer_event);
+		afb_req_success(request, NULL, NULL);
+		return;
+	}
+
+	afb_req_fail(request, "failed", "Invalid event");
+}
+
+static void unsubscribe(struct afb_req request)
+{
+	const char *value = afb_req_value(request, "value");
+
+	if (value && !strcasecmp(value, "gstreamer")) {
+		afb_req_unsubscribe(request, gstreamer_event);
+		afb_req_success(request, NULL, NULL);
+		return;
+	}
+
+	afb_req_fail(request, "failed", "Invalid event");
+}
+
+static gboolean handle_message(GstBus *bus, GstMessage *msg, CustomData *data)
+{
+	switch (GST_MESSAGE_TYPE (msg)) {
+	case GST_MESSAGE_EOS: {
+		int ret;
+
+		pthread_mutex_lock(&mutex);
+
+		data->position = GST_CLOCK_TIME_NONE;
+		data->duration = GST_CLOCK_TIME_NONE;
+
+		ret = seek_track(NEXT_CMD);
+		if (ret < 0) {
+			data->playing = FALSE;
+			current_track = playlist;
+		} else if (data->playing) {
+			gst_element_set_state(data->playbin, GST_STATE_PLAYING);
+		}
+
+		pthread_mutex_unlock(&mutex);
+		break;
+	}
+	case GST_MESSAGE_DURATION:
+		data->duration = GST_CLOCK_TIME_NONE;
+		break;
+	default:
+		break;
+	}
+
+	return TRUE;
+}
+
+static gboolean position_event(CustomData *data)
+{
+	struct playlist_item *track;
+	json_object *jresp = NULL;
+
+	pthread_mutex_lock(&mutex);
+
+	if (!data->playing || current_track == NULL) {
+		pthread_mutex_unlock(&mutex);
+		return TRUE;
+	}
+
+	track = current_track->data;
+	jresp = populate_json(track);
+
+	if (!GST_CLOCK_TIME_IS_VALID(data->duration))
+		gst_element_query_duration(data->playbin,
+					GST_FORMAT_TIME, &data->duration);
+
+	gst_element_query_position(data->playbin,
+					GST_FORMAT_TIME, &data->position);
+
+	json_object_object_add(jresp, "duration",
+			       json_object_new_int64(data->duration / GST_MSECOND));
+	json_object_object_add(jresp, "position",
+			       json_object_new_int64(data->position / GST_MSECOND));
+
+	pthread_mutex_unlock(&mutex);
+
+        afb_event_push(gstreamer_event, jresp);
+
+	return TRUE;
+}
+
+static void *gstreamer_loop_thread(void *ptr)
+{
+	GstBus *bus;
+	json_object *query, *response;
+	int ret;
+
+	gst_init(NULL, NULL);
+
+	data.playbin = gst_element_factory_make("playbin", "playbin");
+	if (!data.playbin) {
+		AFB_ERROR("Cannot create playbin");
+		exit(1);
+	}
+
+	bus = gst_element_get_bus(data.playbin);
+	gst_bus_add_watch(bus, (GstBusFunc) handle_message, &data);
+	g_timeout_add_seconds(1, (GSourceFunc) position_event, &data);
+
+	ret = afb_service_call_sync("mediascanner", "media_result", NULL, &response);
+	if (!ret) {
+		json_object *query = json_object_object_get(response, "response");
+
+		if (query)
+			query = json_object_object_get(query, "Media");
+
+		if (query)
+			populate_playlist(query);
+	}
+	json_object_put(response);
+
+	g_main_loop_run(g_main_loop_new(NULL, FALSE));
+
+	return NULL;
+}
+
+static void onevent(const char *event, struct json_object *object)
+{
+	if (!g_strcmp0(event, "mediascanner/media_added")) {
+		pthread_mutex_lock(&mutex);
+
+		json_object *query = json_object_object_get(object, "Media");
+		if (query)
+			populate_playlist(query);
+
+		pthread_mutex_unlock(&mutex);
+	} else if (!g_strcmp0(event, "mediascanner/media_removed")) {
+		json_object *query = json_object_object_get(object, "Path");
+		const char *path = json_object_get_string(query);
+		GList *l = playlist;
+
+		pthread_mutex_lock(&mutex);
+
+		while (l) {
+			struct playlist_item *item = l->data;
+
+			l = l->next;
+
+			if (!strncasecmp(path, item->media_path, strlen(path))) {
+				playlist = g_list_remove(playlist, item);
+				g_free_playlist_item(item);
+
+				if (current_track->data == item) {
+					current_track = NULL;
+					gst_element_set_state(data.playbin, GST_STATE_NULL);
+				}
+			}
+		}
+
+		current_track = g_list_first(playlist);
+
+		pthread_mutex_unlock(&mutex);
+	} else {
+		AFB_ERROR("Invalid event: %s", event);
+	}
+}
+
+static int init() {
+	pthread_t thread_id;
+	json_object *response, *query;
+	int ret;
+
+	ret = afb_daemon_require_api("mediascanner", 1);
+	if (ret < 0) {
+		AFB_ERROR("Cannot request mediascanner");
+		return ret;
+	}
+
+	query = json_object_new_object();
+	json_object_object_add(query, "value", json_object_new_string("media_added"));
+
+	ret = afb_service_call_sync("mediascanner", "subscribe", query, &response);
+	json_object_put(response);
+
+	if (ret < 0) {
+		AFB_ERROR("Cannot subscribe to mediascanner media_added event");
+		return ret;
+	}
+
+	query = json_object_new_object();
+	json_object_object_add(query, "value", json_object_new_string("media_removed"));
+
+	ret = afb_service_call_sync("mediascanner", "subscribe", query, &response);
+	json_object_put(response);
+
+	if (ret < 0) {
+		AFB_ERROR("Cannot subscribe to mediascanner media_remove event");
+		return ret;
+	}
+
+	gstreamer_event = afb_daemon_make_event("gstreamer");
+
+	return pthread_create(&thread_id, NULL, gstreamer_loop_thread, NULL);
+}
+
+static const struct afb_verb_v2 binding_verbs[] = {
+	{ .verb = "playlist",     .callback = audio_playlist, .info = "Get/set playlist" },
+	{ .verb = "controls",     .callback = controls,       .info = "Audio controls" },
+	{ .verb = "metadata",     .callback = metadata,       .info = "Get metadata of current track" },
+	{ .verb = "subscribe",    .callback = subscribe,      .info = "Subscribe to GStreamer events" },
+	{ .verb = "unsubscribe",  .callback = unsubscribe,    .info = "Unsubscribe to GStreamer events" },
+	{ }
+};
+
+/*
+ * binder API description
+ */
+const struct afb_binding_v2 afbBindingV2 = {
+	.api = "gstreamer",
+	.specification = "GStreamer API",
+	.verbs = binding_verbs,
+	.onevent = onevent,
+	.init = init,
+};