Fix loading and exporting of Theora and WebM video streams

Theora and WebM video streams were mistakenly imported with a ResourceImporter,
but those imported ogvstr and webmstr were simply links to the local resource.
While that works fine in the editor, it no longer works when exporting a game
as the "source" ogv and webm files are ommitted and only the ogvstr and webmstr
references were exported.

As discussed with @reduz, it doesn't make sense to import videos, as we only
intend to play them back and not modify them/access their raw data. As such we
use a ResourceFormatLoader instead of an importer, to load the file on the fly.
ogv and webm files linked to this loader are now considered as resources, and
thus exported.

Note: The Theora and WebM loaders lack any kind of validity check beyond the
existence of the target file, but it was already the case with the importer.
Better checks and error reports could be added, but those loaders will eventually
be obsoleted by GDNative plugins anyway.

Fixes #14954.

6 files changed, 62 insertions, 170 deletions

diff --git a/modules/theora/doc_classes/ResourceImporterTheora.xml b/modules/theora/doc_classes/ResourceImporterTheora.xml
deleted file mode 100644
index 5fc40a6eba..0000000000
--- a/modules/theora/doc_classes/ResourceImporterTheora.xml
+++ /dev/null
@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" ?>
-<class name="ResourceImporterTheora" inherits="ResourceImporter" category="Core" version="3.1">
-	<brief_description>
-	</brief_description>
-	<description>
-	</description>
-	<tutorials>
-	</tutorials>
-	<demos>
-	</demos>
-	<methods>
-	</methods>
-	<constants>
-	</constants>
-</class>
diff --git a/modules/theora/register_types.cpp b/modules/theora/register_types.cpp
index 9bc5ed903a..971fe39c44 100644
--- a/modules/theora/register_types.cpp
+++ b/modules/theora/register_types.cpp
@@ -29,18 +29,22 @@
 /*************************************************************************/
 
 #include "register_types.h"
-#include "resource_importer_theora.h"
+
 #include "video_stream_theora.h"
 
+static ResourceFormatLoaderTheora *resource_loader_theora = NULL;
+
 void register_theora_types() {
 
-#ifdef TOOLS_ENABLED
-	Ref<ResourceImporterTheora> theora_import;
-	theora_import.instance();
-	ResourceFormatImporter::get_singleton()->add_importer(theora_import);
-#endif
+	resource_loader_theora = memnew(ResourceFormatLoaderTheora);
+	ResourceLoader::add_resource_format_loader(resource_loader_theora, true);
+
 	ClassDB::register_class<VideoStreamTheora>();
 }
 
 void unregister_theora_types() {
+
+	if (resource_loader_theora) {
+		memdelete(resource_loader_theora);
+	}
 }
diff --git a/modules/theora/resource_importer_theora.cpp b/modules/theora/resource_importer_theora.cpp
deleted file mode 100644
index ee9bab74a7..0000000000
--- a/modules/theora/resource_importer_theora.cpp
+++ /dev/null
@@ -1,90 +0,0 @@
-/*************************************************************************/
-/*  resource_importer_theora.cpp                                         */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#include "resource_importer_theora.h"
-
-#include "io/resource_saver.h"
-#include "os/file_access.h"
-#include "scene/resources/texture.h"
-
-String ResourceImporterTheora::get_importer_name() const {
-
-	return "Theora";
-}
-
-String ResourceImporterTheora::get_visible_name() const {
-
-	return "Theora";
-}
-void ResourceImporterTheora::get_recognized_extensions(List<String> *p_extensions) const {
-
-	p_extensions->push_back("ogv");
-	p_extensions->push_back("ogm");
-}
-
-String ResourceImporterTheora::get_save_extension() const {
-	return "ogvstr";
-}
-
-String ResourceImporterTheora::get_resource_type() const {
-
-	return "VideoStreamTheora";
-}
-
-bool ResourceImporterTheora::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
-
-	return true;
-}
-
-int ResourceImporterTheora::get_preset_count() const {
-	return 0;
-}
-String ResourceImporterTheora::get_preset_name(int p_idx) const {
-
-	return String();
-}
-
-void ResourceImporterTheora::get_import_options(List<ImportOption> *r_options, int p_preset) const {
-
-	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "loop"), true));
-}
-
-Error ResourceImporterTheora::import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files) {
-
-	VideoStreamTheora *stream = memnew(VideoStreamTheora);
-	stream->set_file(p_source_file);
-
-	Ref<VideoStreamTheora> ogv_stream = Ref<VideoStreamTheora>(stream);
-
-	return ResourceSaver::save(p_save_path + ".ogvstr", ogv_stream);
-}
-
-ResourceImporterTheora::ResourceImporterTheora() {
-}
diff --git a/modules/theora/resource_importer_theora.h b/modules/theora/resource_importer_theora.h
deleted file mode 100644
index e3c79287ad..0000000000
--- a/modules/theora/resource_importer_theora.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*************************************************************************/
-/*  resource_importer_theora.h                                           */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#ifndef RESOURCEIMPORTEROGGTHEORA_H
-#define RESOURCEIMPORTEROGGTHEORA_H
-
-#include "video_stream_theora.h"
-
-#include "core/io/resource_import.h"
-
-class ResourceImporterTheora : public ResourceImporter {
-	GDCLASS(ResourceImporterTheora, ResourceImporter)
-public:
-	virtual String get_importer_name() const;
-	virtual String get_visible_name() const;
-	virtual void get_recognized_extensions(List<String> *p_extensions) const;
-	virtual String get_save_extension() const;
-	virtual String get_resource_type() const;
-
-	virtual int get_preset_count() const;
-	virtual String get_preset_name(int p_idx) const;
-
-	virtual void get_import_options(List<ImportOption> *r_options, int p_preset = 0) const;
-	virtual bool get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const;
-
-	virtual Error import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = NULL);
-
-	ResourceImporterTheora();
-};
-
-#endif // RESOURCEIMPORTEROGGTHEORA_H
diff --git a/modules/theora/video_stream_theora.cpp b/modules/theora/video_stream_theora.cpp
index 9e6307c0bf..881808873b 100644
--- a/modules/theora/video_stream_theora.cpp
+++ b/modules/theora/video_stream_theora.cpp
@@ -730,3 +730,46 @@ void VideoStreamTheora::_bind_methods() {
 
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "file", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "set_file", "get_file");
 }
+
+////////////
+
+RES ResourceFormatLoaderTheora::load(const String &p_path, const String &p_original_path, Error *r_error) {
+
+	FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
+	if (!f) {
+		if (r_error) {
+			*r_error = ERR_CANT_OPEN;
+		}
+		memdelete(f);
+		return RES();
+	}
+
+	VideoStreamTheora *stream = memnew(VideoStreamTheora);
+	stream->set_file(p_path);
+
+	Ref<VideoStreamTheora> ogv_stream = Ref<VideoStreamTheora>(stream);
+
+	if (r_error) {
+		*r_error = OK;
+	}
+
+	return ogv_stream;
+}
+
+void ResourceFormatLoaderTheora::get_recognized_extensions(List<String> *p_extensions) const {
+
+	p_extensions->push_back("ogv");
+}
+
+bool ResourceFormatLoaderTheora::handles_type(const String &p_type) const {
+
+	return ClassDB::is_parent_class(p_type, "VideoStream");
+}
+
+String ResourceFormatLoaderTheora::get_resource_type(const String &p_path) const {
+
+	String el = p_path.get_extension().to_lower();
+	if (el == "ogv")
+		return "VideoStreamTheora";
+	return "";
+}
diff --git a/modules/theora/video_stream_theora.h b/modules/theora/video_stream_theora.h
index 4bdbbdae20..7cee1b491b 100644
--- a/modules/theora/video_stream_theora.h
+++ b/modules/theora/video_stream_theora.h
@@ -163,7 +163,7 @@ public:
 class VideoStreamTheora : public VideoStream {
 
 	GDCLASS(VideoStreamTheora, VideoStream);
-	RES_BASE_EXTENSION("ogvstr");
+	RES_BASE_EXTENSION("ogv");
 
 	String file;
 	int audio_track;
@@ -186,4 +186,12 @@ public:
 	VideoStreamTheora() { audio_track = 0; }
 };
 
+class ResourceFormatLoaderTheora : public ResourceFormatLoader {
+public:
+	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
+	virtual void get_recognized_extensions(List<String> *p_extensions) const;
+	virtual bool handles_type(const String &p_type) const;
+	virtual String get_resource_type(const String &p_path) const;
+};
+
 #endif