Added interface for GDNative Videodecoder.

Interface and callback api added for Videodecoder support.
Should be able to construct any format videodecoder using
only the given interface.

GSoC 2018 project.

12 files changed, 897 insertions, 0 deletions

diff --git a/modules/gdnative/SCsub b/modules/gdnative/SCsub
index fe2d8c7ce9..235f0b97bb 100644
--- a/modules/gdnative/SCsub
+++ b/modules/gdnative/SCsub
@@ -19,6 +19,7 @@ Export('env_gdnative')
 SConscript("net/SCsub")
 SConscript("arvr/SCsub")
 SConscript("pluginscript/SCsub")
+SConscript("videodecoder/SCsub")
 
 
 from platform_methods import run_in_subprocess
diff --git a/modules/gdnative/gdnative_api.json b/modules/gdnative/gdnative_api.json
index c5a1fa139e..20320e18b1 100644
--- a/modules/gdnative/gdnative_api.json
+++ b/modules/gdnative/gdnative_api.json
@@ -6374,6 +6374,42 @@
           ]
         }
       ]
+    },
+    {
+      "name": "videodecoder",
+      "type": "VIDEODECODER",
+      "version": {
+        "major": 0,
+        "minor": 1
+      },
+      "next": null,
+      "api": [
+        {
+          "name": "godot_videodecoder_file_read",
+          "return_type": "godot_int",
+          "arguments": [
+            ["void *", "file_ptr"],
+            ["uint8_t *", "buf"],
+            ["int", "buf_size"]
+          ]
+        },
+        {
+          "name": "godot_videodecoder_file_seek",
+          "return_type": "int64_t",
+          "arguments": [
+            [ "void *", "file_ptr"],
+            ["int64_t", "pos"],
+            ["int", "whence"]
+          ]
+        },
+        {
+          "name": "godot_videodecoder_register_decoder",
+          "return_type": "void",
+          "arguments": [
+            ["const godot_videodecoder_interface_gdnative *", "p_interface"]
+          ]
+        }
+      ]
     }
   ]
 }
diff --git a/modules/gdnative/gdnative_builders.py b/modules/gdnative/gdnative_builders.py
index ff18a3ae69..cd356ce513 100644
--- a/modules/gdnative/gdnative_builders.py
+++ b/modules/gdnative/gdnative_builders.py
@@ -46,6 +46,7 @@ def _build_gdnative_api_struct_header(api):
         '#include <arvr/godot_arvr.h>',
         '#include <nativescript/godot_nativescript.h>',
         '#include <pluginscript/godot_pluginscript.h>',
+        '#include <videodecoder/godot_videodecoder.h>',
         '',
         '#define GDNATIVE_API_INIT(options) do {  \\\n' + '  \\\n'.join(gdnative_api_init_macro) + '  \\\n } while (0)',
         '',
@@ -244,6 +245,7 @@ def _build_gdnative_wrapper_code(api):
         '#include <nativescript/godot_nativescript.h>',
         '#include <pluginscript/godot_pluginscript.h>',
         '#include <arvr/godot_arvr.h>',
+        '#include <videodecoder/godot_videodecoder.h>',
         '',
         '#include <gdnative_api_struct.gen.h>',
         '',
diff --git a/modules/gdnative/include/videodecoder/godot_videodecoder.h b/modules/gdnative/include/videodecoder/godot_videodecoder.h
new file mode 100644
index 0000000000..360fc0f5f5
--- /dev/null
+++ b/modules/gdnative/include/videodecoder/godot_videodecoder.h
@@ -0,0 +1,75 @@
+/*************************************************************************/
+/*  godot_videodecoder.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 GODOT_NATIVEVIDEODECODER_H
+#define GODOT_NATIVEVIDEODECODER_H
+
+#include <gdnative/gdnative.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GODOTAV_API_MAJOR 0
+#define GODOTAV_API_MINOR 1
+
+typedef struct
+{
+	godot_gdnative_api_version version;
+	void *next;
+	void *(*constructor)(godot_object *);
+	void (*destructor)(void *);
+	const char *(*get_plugin_name)(void);
+	const char **(*get_supported_extensions)(int *count);
+	godot_bool (*open_file)(void *, void *); // data struct, and a FileAccess pointer
+	godot_real (*get_length)(const void *);
+	godot_real (*get_playback_position)(const void *);
+	void (*seek)(void *, godot_real);
+	void (*set_audio_track)(void *, godot_int);
+	void (*update)(void *, godot_real);
+	godot_pool_byte_array *(*get_videoframe)(void *);
+	godot_int (*get_audioframe)(void *, float *, int);
+	godot_int (*get_channels)(const void *);
+	godot_int (*get_mix_rate)(const void *);
+	godot_vector2 (*get_texture_size)(const void *);
+} godot_videodecoder_interface_gdnative;
+
+typedef int (*GDNativeAudioMixCallback)(void *, const float *, int);
+
+// FileAccess wrappers for custom FFmpeg IO
+godot_int GDAPI godot_videodecoder_file_read(void *file_ptr, uint8_t *buf, int buf_size);
+int64_t GDAPI godot_videodecoder_file_seek(void *file_ptr, int64_t pos, int whence);
+void GDAPI godot_videodecoder_register_decoder(const godot_videodecoder_interface_gdnative *p_interface);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GODOT_NATIVEVIDEODECODER_H */
diff --git a/modules/gdnative/register_types.cpp b/modules/gdnative/register_types.cpp
index 62e87c3651..8ccab959f4 100644
--- a/modules/gdnative/register_types.cpp
+++ b/modules/gdnative/register_types.cpp
@@ -38,6 +38,7 @@
 #include "nativescript/register_types.h"
 #include "net/register_types.h"
 #include "pluginscript/register_types.h"
+#include "videodecoder/register_types.h"
 
 #include "core/engine.h"
 #include "core/io/resource_loader.h"
@@ -326,6 +327,7 @@ void register_gdnative_types() {
 	register_arvr_types();
 	register_nativescript_types();
 	register_pluginscript_types();
+	register_videodecoder_types();
 
 	// run singletons
 
@@ -378,6 +380,7 @@ void unregister_gdnative_types() {
 	}
 	singleton_gdnatives.clear();
 
+	unregister_videodecoder_types();
 	unregister_pluginscript_types();
 	unregister_nativescript_types();
 	unregister_arvr_types();
diff --git a/modules/gdnative/videodecoder/SCsub b/modules/gdnative/videodecoder/SCsub
new file mode 100644
index 0000000000..51b0418d6b
--- /dev/null
+++ b/modules/gdnative/videodecoder/SCsub
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+import os
+import methods
+
+Import('env')
+Import('env_modules')
+
+env_vsdecoder_gdnative = env_modules.Clone()
+
+env_vsdecoder_gdnative.Append(CPPPATH=['#modules/gdnative/include/'])
+env_vsdecoder_gdnative.add_source_files(env.modules_sources, '*.cpp')
diff --git a/modules/gdnative/videodecoder/register_types.cpp b/modules/gdnative/videodecoder/register_types.cpp
new file mode 100644
index 0000000000..64599365e5
--- /dev/null
+++ b/modules/gdnative/videodecoder/register_types.cpp
@@ -0,0 +1,45 @@
+/*************************************************************************/
+/*  register_types.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 "class_db.h"
+#include "resource_importer_av_gdnative.h"
+#include "video_stream_gdnative.h"
+
+void register_videodecoder_types() {
+
+#ifdef TOOLS_ENABLED
+	Ref<ResourceImporterAVGDNative> avgdn_import;
+	avgdn_import.instance();
+	ResourceFormatImporter::get_singleton()->add_importer(avgdn_import);
+#endif
+	ClassDB::register_class<VideoStreamGDNative>();
+}
+void unregister_videodecoder_types() {
+}
diff --git a/modules/gdnative/videodecoder/register_types.h b/modules/gdnative/videodecoder/register_types.h
new file mode 100644
index 0000000000..dd1943fc47
--- /dev/null
+++ b/modules/gdnative/videodecoder/register_types.h
@@ -0,0 +1,32 @@
+/*************************************************************************/
+/*  register_types.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.                */
+/*************************************************************************/
+
+void register_videodecoder_types();
+void unregister_videodecoder_types();
diff --git a/modules/gdnative/videodecoder/resource_importer_av_gdnative.cpp b/modules/gdnative/videodecoder/resource_importer_av_gdnative.cpp
new file mode 100644
index 0000000000..ff9f6118fb
--- /dev/null
+++ b/modules/gdnative/videodecoder/resource_importer_av_gdnative.cpp
@@ -0,0 +1,96 @@
+/*************************************************************************/
+/*  resource_importer_av_gdnative.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_av_gdnative.h"
+
+#include "io/resource_saver.h"
+#include "os/file_access.h"
+#include "scene/resources/texture.h"
+
+String ResourceImporterAVGDNative::get_importer_name() const {
+
+	return "AVGDNative";
+}
+
+String ResourceImporterAVGDNative::get_visible_name() const {
+
+	return "AVGDNative";
+}
+void ResourceImporterAVGDNative::get_recognized_extensions(List<String> *p_extensions) const {
+
+	Map<String, int>::Element *el = VideoDecoderServer::get_instance()->get_extensions().front();
+	while (el) {
+		p_extensions->push_back(el->key());
+		el = el->next();
+	}
+}
+
+String ResourceImporterAVGDNative::get_save_extension() const {
+
+	return "avgdnstr";
+}
+
+String ResourceImporterAVGDNative::get_resource_type() const {
+
+	return "VideoStreamGDNative";
+}
+
+bool ResourceImporterAVGDNative::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
+
+	return true;
+}
+
+int ResourceImporterAVGDNative::get_preset_count() const {
+
+	return 0;
+}
+
+String ResourceImporterAVGDNative::get_preset_name(int p_idx) const {
+
+	return String();
+}
+
+void ResourceImporterAVGDNative::get_import_options(List<ImportOption> *r_options, int p_preset) const {
+
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "loop"), true));
+}
+
+Error ResourceImporterAVGDNative::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) {
+
+	VideoStreamGDNative *stream = memnew(VideoStreamGDNative);
+	stream->set_file(p_source_file);
+
+	Ref<VideoStreamGDNative> avgdn_stream = Ref<VideoStreamGDNative>(stream);
+
+	return ResourceSaver::save(p_save_path + ".avgdnstr", avgdn_stream);
+}
+
+ResourceImporterAVGDNative::ResourceImporterAVGDNative() {
+}
diff --git a/modules/gdnative/videodecoder/resource_importer_av_gdnative.h b/modules/gdnative/videodecoder/resource_importer_av_gdnative.h
new file mode 100644
index 0000000000..0ec96dc72c
--- /dev/null
+++ b/modules/gdnative/videodecoder/resource_importer_av_gdnative.h
@@ -0,0 +1,58 @@
+/*************************************************************************/
+/*  resource_importer_av_gdnative.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 RESOURCE_IMPORTER_AV_GDNATIVE_H
+#define RESOURCE_IMPORTER_AV_GDNATIVE_H
+
+#include "video_stream_gdnative.h"
+
+#include "core/io/resource_import.h"
+
+class ResourceImporterAVGDNative : public ResourceImporter {
+	GDCLASS(ResourceImporterAVGDNative, 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);
+
+	ResourceImporterAVGDNative();
+};
+
+#endif
diff --git a/modules/gdnative/videodecoder/video_stream_gdnative.cpp b/modules/gdnative/videodecoder/video_stream_gdnative.cpp
new file mode 100644
index 0000000000..a959a4c8ae
--- /dev/null
+++ b/modules/gdnative/videodecoder/video_stream_gdnative.cpp
@@ -0,0 +1,336 @@
+/*************************************************************************/
+/*  video_stream_gdnative.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 "video_stream_gdnative.h"
+#include <project_settings.h>
+#include <servers/audio_server.h>
+
+VideoDecoderServer *VideoDecoderServer::instance = NULL;
+
+static VideoDecoderServer decoder_server;
+
+// NOTE: Callbacks for the GDNative libraries.
+extern "C" {
+godot_int GDAPI godot_videodecoder_file_read(void *ptr, uint8_t *buf, int buf_size) {
+	// ptr is a FileAccess
+	FileAccess *file = reinterpret_cast<FileAccess *>(ptr);
+
+	// if file exists
+	if (file) {
+		long bytes_read = file->get_buffer(buf, buf_size);
+		// No bytes to read => EOF
+		if (bytes_read == 0) {
+			return 0;
+		}
+		return bytes_read;
+	}
+	return -1;
+}
+
+int64_t GDAPI godot_videodecoder_file_seek(void *ptr, int64_t pos, int whence) {
+	// file
+	FileAccess *file = reinterpret_cast<FileAccess *>(ptr);
+
+	size_t len = file->get_len();
+	if (file) {
+		switch (whence) {
+			case SEEK_SET: {
+				// Just for explicitness
+				size_t new_pos = static_cast<size_t>(pos);
+				if (new_pos > len) {
+					return -1;
+				}
+				file->seek(new_pos);
+				pos = static_cast<int64_t>(file->get_position());
+				return pos;
+			} break;
+			case SEEK_CUR: {
+				// Just in case it doesn't exist
+				if (pos < 0 && -pos > file->get_position()) {
+					return -1;
+				}
+				pos = pos + static_cast<int>(file->get_position());
+				file->seek(pos);
+				pos = static_cast<int64_t>(file->get_position());
+				return pos;
+			} break;
+			case SEEK_END: {
+				// Just in case something goes wrong
+				if (-pos > len) {
+					return -1;
+				}
+				file->seek_end(pos);
+				pos = static_cast<int64_t>(file->get_position());
+				return pos;
+			} break;
+			default: {
+				// Only 4 possible options, hence default = AVSEEK_SIZE
+				// Asks to return the length of file
+				return static_cast<int64_t>(len);
+			} break;
+		}
+	}
+	// In case nothing works out.
+	return -1;
+}
+
+void GDAPI godot_videodecoder_register_decoder(const godot_videodecoder_interface_gdnative *p_interface) {
+
+	decoder_server.register_decoder_interface(p_interface);
+}
+}
+
+// VideoStreamPlaybackGDNative starts here.
+
+bool VideoStreamPlaybackGDNative::open_file(const String &p_file) {
+	ERR_FAIL_COND_V(interface == NULL, false);
+	file = FileAccess::open(p_file, FileAccess::READ);
+	bool file_opened = interface->open_file(data_struct, file);
+
+	num_channels = interface->get_channels(data_struct);
+	mix_rate = interface->get_mix_rate(data_struct);
+
+	godot_vector2 vec = interface->get_texture_size(data_struct);
+	texture_size = *(Vector2 *)&vec;
+
+	pcm = (float *)memalloc(num_channels * AUX_BUFFER_SIZE * sizeof(float));
+	memset(pcm, 0, num_channels * AUX_BUFFER_SIZE * sizeof(float));
+	pcm_write_idx = -1;
+	samples_decoded = 0;
+
+	texture->create((int)texture_size.width, (int)texture_size.height, Image::FORMAT_RGBA8, Texture::FLAG_FILTER | Texture::FLAG_VIDEO_SURFACE);
+
+	return file_opened;
+}
+
+void VideoStreamPlaybackGDNative::update(float p_delta) {
+	if (!playing || paused) {
+		return;
+	}
+	if (!file) {
+		return;
+	}
+	time += p_delta;
+	ERR_FAIL_COND(interface == NULL);
+	interface->update(data_struct, p_delta);
+
+	if (pcm_write_idx >= 0) {
+		// Previous remains
+		int mixed = mix_callback(mix_udata, pcm, samples_decoded);
+		if (mixed == samples_decoded) {
+			pcm_write_idx = -1;
+		} else {
+			samples_decoded -= mixed;
+			pcm_write_idx += mixed;
+		}
+	}
+	if (pcm_write_idx < 0) {
+		samples_decoded = interface->get_audioframe(data_struct, pcm, AUX_BUFFER_SIZE);
+		pcm_write_idx = mix_callback(mix_udata, pcm, samples_decoded);
+		if (pcm_write_idx == samples_decoded) {
+			pcm_write_idx = -1;
+		} else {
+			samples_decoded -= pcm_write_idx;
+		}
+	}
+
+	while (interface->get_playback_position(data_struct) < time) {
+
+		update_texture();
+	}
+}
+
+void VideoStreamPlaybackGDNative::update_texture() {
+	PoolByteArray *pba = (PoolByteArray *)interface->get_videoframe(data_struct);
+
+	if (pba == NULL) {
+		playing = false;
+		return;
+	}
+
+	Ref<Image> img = memnew(Image(texture_size.width, texture_size.height, 0, Image::FORMAT_RGBA8, *pba));
+
+	texture->set_data(img);
+}
+
+// ctor and dtor
+
+VideoStreamPlaybackGDNative::VideoStreamPlaybackGDNative() :
+		texture(Ref<ImageTexture>(memnew(ImageTexture))),
+		time(0),
+		mix_udata(NULL),
+		mix_callback(NULL),
+		num_channels(-1),
+		mix_rate(0),
+		playing(false) {}
+
+VideoStreamPlaybackGDNative::~VideoStreamPlaybackGDNative() {
+	cleanup();
+}
+
+void VideoStreamPlaybackGDNative::cleanup() {
+	if (data_struct)
+		interface->destructor(data_struct);
+	memfree(pcm);
+	pcm = NULL;
+	time = 0;
+	num_channels = -1;
+	interface = NULL;
+	data_struct = NULL;
+}
+
+void VideoStreamPlaybackGDNative::set_interface(const godot_videodecoder_interface_gdnative *p_interface) {
+	ERR_FAIL_COND(p_interface == NULL);
+	if (interface != NULL) {
+		cleanup();
+	}
+	interface = p_interface;
+	data_struct = interface->constructor((godot_object *)this);
+}
+
+// controls
+
+bool VideoStreamPlaybackGDNative::is_playing() const {
+	return playing;
+}
+
+bool VideoStreamPlaybackGDNative::is_paused() const {
+	return paused;
+}
+
+void VideoStreamPlaybackGDNative::play() {
+
+	stop();
+
+	playing = true;
+
+	delay_compensation = ProjectSettings::get_singleton()->get("audio/video_delay_compensation_ms");
+	delay_compensation /= 1000.0;
+}
+
+void VideoStreamPlaybackGDNative::stop() {
+	if (playing) {
+		seek(0);
+	}
+	playing = false;
+}
+
+void VideoStreamPlaybackGDNative::seek(float p_time) {
+	ERR_FAIL_COND(interface == NULL);
+	interface->seek(data_struct, p_time);
+}
+
+void VideoStreamPlaybackGDNative::set_paused(bool p_paused) {
+	paused = p_paused;
+}
+
+Ref<Texture> VideoStreamPlaybackGDNative::get_texture() {
+	return texture;
+}
+
+float VideoStreamPlaybackGDNative::get_length() const {
+	ERR_FAIL_COND_V(interface == NULL, 0);
+	return interface->get_length(data_struct);
+}
+
+float VideoStreamPlaybackGDNative::get_playback_position() const {
+
+	ERR_FAIL_COND_V(interface == NULL, 0);
+	return interface->get_playback_position(data_struct);
+}
+
+bool VideoStreamPlaybackGDNative::has_loop() const {
+	// TODO: Implement looping?
+	return false;
+}
+
+void VideoStreamPlaybackGDNative::set_loop(bool p_enable) {
+	// Do nothing
+}
+
+void VideoStreamPlaybackGDNative::set_audio_track(int p_idx) {
+	ERR_FAIL_COND(interface == NULL);
+	interface->set_audio_track(data_struct, p_idx);
+}
+
+void VideoStreamPlaybackGDNative::set_mix_callback(AudioMixCallback p_callback, void *p_userdata) {
+
+	mix_udata = p_userdata;
+	mix_callback = p_callback;
+}
+
+int VideoStreamPlaybackGDNative::get_channels() const {
+	ERR_FAIL_COND_V(interface == NULL, 0);
+
+	return (num_channels > 0) ? num_channels : 0;
+}
+
+int VideoStreamPlaybackGDNative::get_mix_rate() const {
+	ERR_FAIL_COND_V(interface == NULL, 0);
+
+	return mix_rate;
+}
+
+/* --- NOTE VideoStreamGDNative starts here. ----- */
+
+Ref<VideoStreamPlayback> VideoStreamGDNative::instance_playback() {
+	Ref<VideoStreamPlaybackGDNative> pb = memnew(VideoStreamPlaybackGDNative);
+	VideoDecoderGDNative *decoder = decoder_server.get_decoder(file.get_extension().to_lower());
+	if (decoder == NULL)
+		return NULL;
+	pb->set_interface(decoder->interface);
+	pb->set_audio_track(audio_track);
+	if (pb->open_file(file))
+		return pb;
+	return NULL;
+}
+
+void VideoStreamGDNative::set_file(const String &p_file) {
+
+	file = p_file;
+}
+
+String VideoStreamGDNative::get_file() {
+
+	return file;
+}
+
+void VideoStreamGDNative::_bind_methods() {
+
+	ClassDB::bind_method(D_METHOD("set_file", "file"), &VideoStreamGDNative::set_file);
+	ClassDB::bind_method(D_METHOD("get_file"), &VideoStreamGDNative::get_file);
+
+	ADD_PROPERTY(PropertyInfo(Variant::STRING, "file", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "set_file", "get_file");
+}
+
+void VideoStreamGDNative::set_audio_track(int p_track) {
+
+	audio_track = p_track;
+}
diff --git a/modules/gdnative/videodecoder/video_stream_gdnative.h b/modules/gdnative/videodecoder/video_stream_gdnative.h
new file mode 100644
index 0000000000..d203a5d04f
--- /dev/null
+++ b/modules/gdnative/videodecoder/video_stream_gdnative.h
@@ -0,0 +1,201 @@
+/*************************************************************************/
+/*  video_stream_gdnative.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 VIDEO_STREAM_GDNATIVE_H
+#define VIDEO_STREAM_GDNATIVE_H
+
+#include <modules/gdnative/gdnative.h>
+#include <os/file_access.h>
+#include <scene/resources/texture.h>
+#include <scene/resources/video_stream.h>
+
+struct VideoDecoderGDNative {
+	String plugin_name;
+	Vector<String> supported_extensions;
+	const godot_videodecoder_interface_gdnative *interface;
+
+	VideoDecoderGDNative() :
+			interface(NULL),
+			plugin_name("none") {}
+
+	VideoDecoderGDNative(const godot_videodecoder_interface_gdnative *p_interface) :
+			interface(p_interface),
+			plugin_name(p_interface->get_plugin_name()) {
+		_get_supported_extensions();
+	}
+
+private:
+	void _get_supported_extensions() {
+		supported_extensions.clear();
+		int num_ext;
+		const char **supported_ext = interface->get_supported_extensions(&num_ext);
+		for (int i = 0; i < num_ext; i++) {
+			supported_extensions.push_back(supported_ext[i]);
+		}
+	}
+};
+
+class VideoDecoderServer {
+private:
+	Vector<VideoDecoderGDNative *> decoders;
+	Map<String, int> extensions;
+
+	static VideoDecoderServer *instance;
+
+public:
+	static VideoDecoderServer *get_instance() {
+		return instance;
+	}
+
+	const Map<String, int> &get_extensions() {
+		return extensions;
+	}
+
+	void register_decoder_interface(const godot_videodecoder_interface_gdnative *p_interface) {
+		VideoDecoderGDNative *decoder = memnew(VideoDecoderGDNative(p_interface));
+		int index = decoders.size();
+		for (int i = 0; i < decoder->supported_extensions.size(); i++) {
+			extensions[decoder->supported_extensions[i]] = index;
+		}
+		decoders.push_back(decoder);
+	}
+
+	VideoDecoderGDNative *get_decoder(const String &extension) {
+		if (extensions.size() == 0 || !extensions.has(extension))
+			return NULL;
+		return decoders[extensions[extension]];
+	}
+
+	VideoDecoderServer() {
+		instance = this;
+	}
+
+	~VideoDecoderServer() {
+		for (int i = 0; i < decoders.size(); i++) {
+			memdelete(decoders[i]);
+		}
+		decoders.clear();
+		instance = NULL;
+	}
+};
+
+class VideoStreamPlaybackGDNative : public VideoStreamPlayback {
+
+	GDCLASS(VideoStreamPlaybackGDNative, VideoStreamPlayback);
+
+	Ref<ImageTexture> texture;
+	bool playing;
+	bool paused;
+
+	Vector2 texture_size;
+
+	void *mix_udata;
+	AudioMixCallback mix_callback;
+
+	int num_channels;
+	float time;
+	int mix_rate;
+	double delay_compensation;
+
+	const int AUX_BUFFER_SIZE = 1024; // Buffer 1024 samples.
+	float *pcm;
+	int pcm_write_idx;
+	int samples_decoded;
+
+	void cleanup();
+	void update_texture();
+
+protected:
+	String file_name;
+
+	FileAccess *file = NULL;
+
+	const godot_videodecoder_interface_gdnative *interface = NULL;
+	void *data_struct = NULL;
+
+public:
+	VideoStreamPlaybackGDNative();
+	~VideoStreamPlaybackGDNative();
+
+	void set_interface(const godot_videodecoder_interface_gdnative *p_interface);
+
+	bool open_file(const String &p_file);
+
+	virtual void stop();
+	virtual void play();
+
+	virtual bool is_playing() const;
+
+	virtual void set_paused(bool p_paused);
+	virtual bool is_paused() const;
+
+	virtual void set_loop(bool p_enable);
+	virtual bool has_loop() const;
+
+	virtual float get_length() const;
+
+	virtual float get_playback_position() const;
+	virtual void seek(float p_time);
+
+	virtual void set_audio_track(int p_idx);
+
+	//virtual int mix(int16_t* p_buffer,int p_frames)=0;
+
+	virtual Ref<Texture> get_texture();
+	virtual void update(float p_delta);
+
+	virtual void set_mix_callback(AudioMixCallback p_callback, void *p_userdata);
+	virtual int get_channels() const;
+	virtual int get_mix_rate() const;
+};
+
+class VideoStreamGDNative : public VideoStream {
+
+	GDCLASS(VideoStreamGDNative, VideoStream);
+	RES_BASE_EXTENSION("avgdnstr");
+
+	String file;
+	int audio_track;
+
+protected:
+	static void
+	_bind_methods();
+
+public:
+	void set_file(const String &p_file);
+	String get_file();
+
+	virtual void set_audio_track(int p_track);
+	virtual Ref<VideoStreamPlayback> instance_playback();
+
+	VideoStreamGDNative() {}
+};
+
+#endif