Ajout du GUI

kivy/core/video/__init__.py

@@ -0,0 +1,219 @@
+'''
+Video
+=====
+
+Core class for reading video files and managing the video
+:class:`~kivy.graphics.texture.Texture`.
+
+.. versionchanged:: 1.10.0
+    The pyglet, pygst and gi providers have been removed.
+
+.. versionchanged:: 1.8.0
+    There are now 2 distinct Gstreamer implementations: one using Gi/Gst
+    working for both Python 2+3 with Gstreamer 1.0, and one using PyGST
+    working only for Python 2 + Gstreamer 0.10.
+
+.. note::
+
+    Recording is not supported.
+'''
+
+__all__ = ('VideoBase', 'Video')
+
+from kivy.clock import Clock
+from kivy.core import core_select_lib
+from kivy.event import EventDispatcher
+from kivy.logger import Logger
+from kivy.compat import PY2
+
+
+class VideoBase(EventDispatcher):
+    '''VideoBase, a class used to implement a video reader.
+
+    :Parameters:
+        `filename`: str
+            Filename of the video. Can be a file or an URI.
+        `eos`: str, defaults to 'pause'
+            Action to take when EOS is hit. Can be one of 'pause', 'stop' or
+            'loop'.
+
+            .. versionchanged:: 1.4.0
+                added 'pause'
+
+        `async`: bool, defaults to True
+            Load the video asynchronously (may be not supported by all
+            providers).
+        `autoplay`: bool, defaults to False
+            Auto play the video on init.
+
+    :Events:
+        `on_eos`
+            Fired when EOS is hit.
+        `on_load`
+            Fired when the video is loaded and the texture is available.
+        `on_frame`
+            Fired when a new frame is written to the texture.
+    '''
+
+    __slots__ = ('_wantplay', '_buffer', '_filename', '_texture',
+                 '_volume', 'eos', '_state', '_async', '_autoplay')
+
+    __events__ = ('on_eos', 'on_load', 'on_frame')
+
+    def __init__(self, **kwargs):
+        kwargs.setdefault('filename', None)
+        kwargs.setdefault('eos', 'stop')
+        kwargs.setdefault('async', True)
+        kwargs.setdefault('autoplay', False)
+
+        super(VideoBase, self).__init__()
+
+        self._wantplay = False
+        self._buffer = None
+        self._filename = None
+        self._texture = None
+        self._volume = 1.
+        self._state = ''
+
+        self._autoplay = kwargs.get('autoplay')
+        self._async = kwargs.get('async')
+        self.eos = kwargs.get('eos')
+        if self.eos == 'pause':
+            Logger.warning("'pause' is deprecated. Use 'stop' instead.")
+            self.eos = 'stop'
+        self.filename = kwargs.get('filename')
+
+        Clock.schedule_interval(self._update, 1 / 30.)
+
+        if self._autoplay:
+            self.play()
+
+    def __del__(self):
+        self.unload()
+
+    def on_eos(self):
+        pass
+
+    def on_load(self):
+        pass
+
+    def on_frame(self):
+        pass
+
+    def _get_filename(self):
+        return self._filename
+
+    def _set_filename(self, filename):
+        if filename == self._filename:
+            return
+        self.unload()
+        self._filename = filename
+        if self._filename is None:
+            return
+        self.load()
+
+    filename = property(lambda self: self._get_filename(),
+                        lambda self, x: self._set_filename(x),
+                        doc='Get/set the filename/uri of the current video')
+
+    def _get_position(self):
+        return 0
+
+    def _set_position(self, pos):
+        self.seek(pos)
+
+    position = property(lambda self: self._get_position(),
+                        lambda self, x: self._set_position(x),
+                        doc='Get/set the position in the video (in seconds)')
+
+    def _get_volume(self):
+        return self._volume
+
+    def _set_volume(self, volume):
+        self._volume = volume
+
+    volume = property(lambda self: self._get_volume(),
+                      lambda self, x: self._set_volume(x),
+                      doc='Get/set the volume in the video (1.0 = 100%)')
+
+    def _get_duration(self):
+        return 0
+
+    duration = property(lambda self: self._get_duration(),
+                        doc='Get the video duration (in seconds)')
+
+    def _get_texture(self):
+        return self._texture
+
+    texture = property(lambda self: self._get_texture(),
+                       doc='Get the video texture')
+
+    def _get_state(self):
+        return self._state
+
+    state = property(lambda self: self._get_state(),
+                     doc='Get the video playing status')
+
+    def _do_eos(self, *args):
+        '''
+        .. versionchanged:: 1.4.0
+            Now dispatches the `on_eos` event.
+        '''
+        if self.eos == 'pause':
+            self.pause()
+        elif self.eos == 'stop':
+            self.stop()
+        elif self.eos == 'loop':
+            self.position = 0
+            self.play()
+
+        self.dispatch('on_eos')
+
+    def _update(self, dt):
+        '''Update the video content to texture.
+        '''
+        pass
+
+    def seek(self, percent, precise=True):
+        '''Move to position as percentage (strictly, a proportion from
+            0 - 1) of the duration'''
+        pass
+
+    def stop(self):
+        '''Stop the video playing'''
+        self._state = ''
+
+    def pause(self):
+        '''Pause the video
+
+        .. versionadded:: 1.4.0
+        '''
+        self._state = 'paused'
+
+    def play(self):
+        '''Play the video'''
+        self._state = 'playing'
+
+    def load(self):
+        '''Load the video from the current filename'''
+        pass
+
+    def unload(self):
+        '''Unload the actual video'''
+        self._state = ''
+
+
+# Load the appropriate provider
+video_providers = []
+try:
+    from kivy.lib.gstplayer import GstPlayer  # NOQA
+    video_providers += [('gstplayer', 'video_gstplayer', 'VideoGstplayer')]
+except ImportError:
+    pass
+video_providers += [
+    ('ffmpeg', 'video_ffmpeg', 'VideoFFMpeg'),
+    ('ffpyplayer', 'video_ffpyplayer', 'VideoFFPy'),
+    ('null', 'video_null', 'VideoNull')]
+
+
+Video = core_select_lib('video', video_providers)

kivy/core/video/video_ffmpeg.py

@@ -0,0 +1,106 @@
+'''
+FFmpeg video abstraction
+========================
+
+.. versionadded:: 1.0.8
+
+This abstraction requires ffmpeg python extensions. We have made a special
+extension that is used for the android platform but can also be used on x86
+platforms. The project is available at::
+
+    http://github.com/tito/ffmpeg-android
+
+The extension is designed for implementing a video player.
+Refer to the documentation of the ffmpeg-android project for more information
+about the requirements.
+'''
+
+try:
+    import ffmpeg
+except:
+    raise
+
+from kivy.core.video import VideoBase
+from kivy.graphics.texture import Texture
+
+
+class VideoFFMpeg(VideoBase):
+
+    def __init__(self, **kwargs):
+        self._do_load = False
+        self._player = None
+        super(VideoFFMpeg, self).__init__(**kwargs)
+
+    def unload(self):
+        if self._player:
+            self._player.stop()
+            self._player = None
+        self._state = ''
+        self._do_load = False
+
+    def load(self):
+        self.unload()
+
+    def play(self):
+        if self._player:
+            self.unload()
+        self._player = ffmpeg.FFVideo(self._filename)
+        self._player.set_volume(self._volume)
+        self._do_load = True
+
+    def stop(self):
+        self.unload()
+
+    def seek(self, percent, precise=True):
+        if self._player is None:
+            return
+        self._player.seek(percent)
+
+    def _do_eos(self):
+        self.unload()
+        self.dispatch('on_eos')
+        super(VideoFFMpeg, self)._do_eos()
+
+    def _update(self, dt):
+        if self._do_load:
+            self._player.open()
+            self._do_load = False
+            return
+
+        player = self._player
+        if player is None:
+            return
+        if not player.is_open:
+            self._do_eos()
+            return
+
+        frame = player.get_next_frame()
+        if frame is None:
+            return
+
+        # first time we got a frame, we know that video is read now.
+        if self._texture is None:
+            self._texture = Texture.create(size=(
+                player.get_width(), player.get_height()),
+                colorfmt='rgb')
+            self._texture.flip_vertical()
+            self.dispatch('on_load')
+
+        if self._texture:
+            self._texture.blit_buffer(frame)
+            self.dispatch('on_frame')
+
+    def _get_duration(self):
+        if self._player is None:
+            return 0
+        return self._player.get_duration()
+
+    def _get_position(self):
+        if self._player is None:
+            return 0
+        return self._player.get_position()
+
+    def _set_volume(self, value):
+        self._volume = value
+        if self._player:
+            self._player.set_volume(self._volume)

kivy/core/video/video_ffpyplayer.py

@@ -0,0 +1,446 @@
+'''
+FFmpeg based video abstraction
+==============================
+
+To use, you need to install ffpyplayer and have a compiled ffmpeg shared
+library.
+
+    https://github.com/matham/ffpyplayer
+
+The docs there describe how to set this up. But briefly, first you need to
+compile ffmpeg using the shared flags while disabling the static flags (you'll
+probably have to set the fPIC flag, e.g. CFLAGS=-fPIC). Here are some
+instructions: https://trac.ffmpeg.org/wiki/CompilationGuide. For Windows, you
+can download compiled GPL binaries from http://ffmpeg.zeranoe.com/builds/.
+Similarly, you should download SDL2.
+
+Now, you should have ffmpeg and sdl directories. In each, you should have an
+'include', 'bin' and 'lib' directory, where e.g. for Windows, 'lib' contains
+the .dll.a files, while 'bin' contains the actual dlls. The 'include' directory
+holds the headers. The 'bin' directory is only needed if the shared libraries
+are not already in the path. In the environment, define FFMPEG_ROOT and
+SDL_ROOT, each pointing to the ffmpeg and SDL directories respectively. (If
+you're using SDL2, the 'include' directory will contain an 'SDL2' directory,
+which then holds the headers).
+
+Once defined, download the ffpyplayer git repo and run
+
+    python setup.py build_ext --inplace
+
+Finally, before running you need to ensure that ffpyplayer is in python's path.
+
+..Note::
+
+    When kivy exits by closing the window while the video is playing,
+    it appears that the __del__method of VideoFFPy
+    is not called. Because of this, the VideoFFPy object is not
+    properly deleted when kivy exits. The consequence is that because
+    MediaPlayer creates internal threads which do not have their daemon
+    flag set, when the main threads exists, it'll hang and wait for the other
+    MediaPlayer threads to exit. But since __del__ is not called to delete the
+    MediaPlayer object, those threads will remain alive, hanging kivy. What
+    this means is that you have to be sure to delete the MediaPlayer object
+    before kivy exits by setting it to None.
+'''
+
+__all__ = ('VideoFFPy', )
+
+try:
+    import ffpyplayer
+    from ffpyplayer.player import MediaPlayer
+    from ffpyplayer.tools import set_log_callback, get_log_callback
+except:
+    raise
+
+
+from threading import Thread
+from queue import Queue, Empty, Full
+from kivy.clock import Clock, mainthread
+from kivy.logger import Logger
+from kivy.core.video import VideoBase
+from kivy.graphics import Rectangle, BindTexture
+from kivy.graphics.texture import Texture
+from kivy.graphics.fbo import Fbo
+from kivy.weakmethod import WeakMethod
+import time
+
+Logger.info('VideoFFPy: Using ffpyplayer {}'.format(ffpyplayer.version))
+
+
+logger_func = {'quiet': Logger.critical, 'panic': Logger.critical,
+               'fatal': Logger.critical, 'error': Logger.error,
+               'warning': Logger.warning, 'info': Logger.info,
+               'verbose': Logger.debug, 'debug': Logger.debug}
+
+
+def _log_callback(message, level):
+    message = message.strip()
+    if message:
+        logger_func[level]('ffpyplayer: {}'.format(message))
+
+
+if not get_log_callback():
+    set_log_callback(_log_callback)
+
+
+class VideoFFPy(VideoBase):
+
+    YUV_RGB_FS = """
+    $HEADER$
+    uniform sampler2D tex_y;
+    uniform sampler2D tex_u;
+    uniform sampler2D tex_v;
+
+    void main(void) {
+        float y = texture2D(tex_y, tex_coord0).r;
+        float u = texture2D(tex_u, tex_coord0).r - 0.5;
+        float v = texture2D(tex_v, tex_coord0).r - 0.5;
+        float r = y +             1.402 * v;
+        float g = y - 0.344 * u - 0.714 * v;
+        float b = y + 1.772 * u;
+        gl_FragColor = vec4(r, g, b, 1.0);
+    }
+    """
+
+    _trigger = None
+
+    def __init__(self, **kwargs):
+        self._ffplayer = None
+        self._thread = None
+        self._next_frame = None
+        self._seek_queue = []
+        self._ffplayer_need_quit = False
+        self._wakeup_queue = Queue(maxsize=1)
+        self._trigger = Clock.create_trigger(self._redraw)
+
+        super(VideoFFPy, self).__init__(**kwargs)
+
+    def __del__(self):
+        self.unload()
+
+    def _wakeup_thread(self):
+        try:
+            self._wakeup_queue.put(None, False)
+        except Full:
+            pass
+
+    def _wait_for_wakeup(self, timeout):
+        try:
+            self._wakeup_queue.get(True, timeout)
+        except Empty:
+            pass
+
+    def _player_callback(self, selector, value):
+        if self._ffplayer is None:
+            return
+        if selector == 'quit':
+            def close(*args):
+                self.unload()
+            Clock.schedule_once(close, 0)
+
+    def _get_position(self):
+        if self._ffplayer is not None:
+            return self._ffplayer.get_pts()
+        return 0
+
+    def _set_position(self, pos):
+        self.seek(pos)
+
+    def _set_volume(self, volume):
+        self._volume = volume
+        if self._ffplayer is not None:
+            self._ffplayer.set_volume(self._volume)
+
+    def _get_duration(self):
+        if self._ffplayer is None:
+            return 0
+        return self._ffplayer.get_metadata()['duration']
+
+    @mainthread
+    def _do_eos(self):
+        if self.eos == 'pause':
+            self.pause()
+        elif self.eos == 'stop':
+            self.stop()
+        elif self.eos == 'loop':
+            # this causes a seek to zero
+            self.position = 0
+
+        self.dispatch('on_eos')
+
+    @mainthread
+    def _finish_setup(self):
+        # once setup is done, we make sure player state matches what user
+        # could have requested while player was being setup and it was in limbo
+        # also, thread starts player in internal paused mode, so this unpauses
+        # it if user didn't request pause meanwhile
+        if self._ffplayer is not None:
+            self._ffplayer.set_volume(self._volume)
+            self._ffplayer.set_pause(self._state == 'paused')
+            self._wakeup_thread()
+
+    def _redraw(self, *args):
+        if not self._ffplayer:
+            return
+        next_frame = self._next_frame
+        if not next_frame:
+            return
+
+        img, pts = next_frame
+        if img.get_size() != self._size or self._texture is None:
+            self._size = w, h = img.get_size()
+
+            if self._out_fmt == 'yuv420p':
+                w2 = int(w / 2)
+                h2 = int(h / 2)
+                self._tex_y = Texture.create(
+                    size=(w, h), colorfmt='luminance')
+                self._tex_u = Texture.create(
+                    size=(w2, h2), colorfmt='luminance')
+                self._tex_v = Texture.create(
+                    size=(w2, h2), colorfmt='luminance')
+                self._fbo = fbo = Fbo(size=self._size)
+                with fbo:
+                    BindTexture(texture=self._tex_u, index=1)
+                    BindTexture(texture=self._tex_v, index=2)
+                    Rectangle(size=fbo.size, texture=self._tex_y)
+                fbo.shader.fs = VideoFFPy.YUV_RGB_FS
+                fbo['tex_y'] = 0
+                fbo['tex_u'] = 1
+                fbo['tex_v'] = 2
+                self._texture = fbo.texture
+            else:
+                self._texture = Texture.create(size=self._size,
+                                                colorfmt='rgba')
+
+            # XXX FIXME
+            # self.texture.add_reload_observer(self.reload_buffer)
+            self._texture.flip_vertical()
+            self.dispatch('on_load')
+
+        if self._texture:
+            if self._out_fmt == 'yuv420p':
+                dy, du, dv, _ = img.to_memoryview()
+                if dy and du and dv:
+                    self._tex_y.blit_buffer(dy, colorfmt='luminance')
+                    self._tex_u.blit_buffer(du, colorfmt='luminance')
+                    self._tex_v.blit_buffer(dv, colorfmt='luminance')
+                    self._fbo.ask_update()
+                    self._fbo.draw()
+            else:
+                self._texture.blit_buffer(
+                    img.to_memoryview()[0], colorfmt='rgba')
+
+            self.dispatch('on_frame')
+
+    def _next_frame_run(self, ffplayer):
+        sleep = time.sleep
+        trigger = self._trigger
+        did_dispatch_eof = False
+        wait_for_wakeup = self._wait_for_wakeup
+        seek_queue = self._seek_queue
+        # video starts in internal paused state
+
+        # fast path, if the source video is yuv420p, we'll use a glsl shader
+        # for buffer conversion to rgba
+        # wait until we get frame metadata
+        while not self._ffplayer_need_quit:
+            src_pix_fmt = ffplayer.get_metadata().get('src_pix_fmt')
+            if not src_pix_fmt:
+                wait_for_wakeup(0.005)
+                continue
+
+            if src_pix_fmt == 'yuv420p':
+                self._out_fmt = 'yuv420p'
+                ffplayer.set_output_pix_fmt(self._out_fmt)
+            break
+
+        if self._ffplayer_need_quit:
+            ffplayer.close_player()
+            return
+
+        # wait until loaded or failed, shouldn't take long, but just to make
+        # sure metadata is available.
+        while not self._ffplayer_need_quit:
+            if ffplayer.get_metadata()['src_vid_size'] != (0, 0):
+                break
+            wait_for_wakeup(0.005)
+
+        if self._ffplayer_need_quit:
+            ffplayer.close_player()
+            return
+
+        self._ffplayer = ffplayer
+        self._finish_setup()
+        # now, we'll be in internal paused state and loop will wait until
+        # mainthread unpauses us when finishing setup
+
+        while not self._ffplayer_need_quit:
+            seek_happened = False
+            if seek_queue:
+                vals = seek_queue[:]
+                del seek_queue[:len(vals)]
+                percent, precise = vals[-1]
+                ffplayer.seek(
+                    percent * ffplayer.get_metadata()['duration'],
+                    relative=False,
+                    accurate=precise
+                )
+                seek_happened = True
+                did_dispatch_eof = False
+                self._next_frame = None
+
+            # Get next frame if paused:
+            if seek_happened and ffplayer.get_pause():
+                ffplayer.set_volume(0.0)  # Try to do it silently.
+                ffplayer.set_pause(False)
+                try:
+                    # We don't know concrete number of frames to skip,
+                    # this number worked fine on couple of tested videos:
+                    to_skip = 6
+                    while True:
+                        frame, val = ffplayer.get_frame(show=False)
+                        # Exit loop on invalid val:
+                        if val in ('paused', 'eof'):
+                            break
+                        # Exit loop on seek_queue updated:
+                        if seek_queue:
+                            break
+                        # Wait for next frame:
+                        if frame is None:
+                            sleep(0.005)
+                            continue
+                        # Wait until we skipped enough frames:
+                        to_skip -= 1
+                        if to_skip == 0:
+                            break
+                    # Assuming last frame is actual, just get it:
+                    frame, val = ffplayer.get_frame(force_refresh=True)
+                finally:
+                    ffplayer.set_pause(bool(self._state == 'paused'))
+                    # todo: this is not safe because user could have updated
+                    # volume between us reading it and setting it
+                    ffplayer.set_volume(self._volume)
+            # Get next frame regular:
+            else:
+                frame, val = ffplayer.get_frame()
+
+            if val == 'eof':
+                if not did_dispatch_eof:
+                    self._do_eos()
+                    did_dispatch_eof = True
+                wait_for_wakeup(None)
+            elif val == 'paused':
+                did_dispatch_eof = False
+                wait_for_wakeup(None)
+            else:
+                did_dispatch_eof = False
+                if frame:
+                    self._next_frame = frame
+                    trigger()
+                else:
+                    val = val if val else (1 / 30.)
+                wait_for_wakeup(val)
+
+        ffplayer.close_player()
+
+    def seek(self, percent, precise=True):
+        # still save seek while thread is setting up
+        self._seek_queue.append((percent, precise,))
+        self._wakeup_thread()
+
+    def stop(self):
+        self.unload()
+
+    def pause(self):
+        # if state hasn't been set (empty), there's no player. If it's
+        # paused, nothing to do so just handle playing
+        if self._state == 'playing':
+            # we could be in limbo while player is setting up so check. Player
+            # will pause when finishing setting up
+            if self._ffplayer is not None:
+                self._ffplayer.set_pause(True)
+            # even in limbo, indicate to start in paused state
+            self._state = 'paused'
+            self._wakeup_thread()
+
+    def play(self):
+        # _state starts empty and is empty again after unloading
+        if self._ffplayer:
+            # player is already setup, just handle unpausing
+            assert self._state in ('paused', 'playing')
+            if self._state == 'paused':
+                self._ffplayer.set_pause(False)
+                self._state = 'playing'
+                self._wakeup_thread()
+            return
+
+        # we're now either in limbo state waiting for thread to setup,
+        # or no thread has been started
+        if self._state == 'playing':
+            # in limbo, just wait for thread to setup player
+            return
+        elif self._state == 'paused':
+            # in limbo, still unpause for when player becomes ready
+            self._state = 'playing'
+            self._wakeup_thread()
+            return
+
+        # load first unloads
+        self.load()
+        self._out_fmt = 'rgba'
+        # it starts internally paused, but unpauses itself
+        ff_opts = {
+            'paused': True,
+            'out_fmt': self._out_fmt,
+            'sn': True,
+            'volume': self._volume,
+        }
+        ffplayer = MediaPlayer(
+            self._filename, callback=self._player_callback,
+            thread_lib='SDL',
+            loglevel='info', ff_opts=ff_opts
+        )
+
+        # Disabled as an attempt to fix kivy issue #6210
+        # self._ffplayer.set_volume(self._volume)
+
+        self._thread = Thread(
+            target=self._next_frame_run,
+            name='Next frame',
+            args=(ffplayer, )
+        )
+        # todo: remove
+        self._thread.daemon = True
+
+        # start in playing mode, but _ffplayer isn't set until ready. We're
+        # now in a limbo state
+        self._state = 'playing'
+        self._thread.start()
+
+    def load(self):
+        self.unload()
+
+    def unload(self):
+        # no need to call self._trigger.cancel() because _ffplayer is set
+        # to None below, and it's not safe to call clock stuff from __del__
+
+        # if thread is still alive, set it to exit and wake it
+        self._wakeup_thread()
+        self._ffplayer_need_quit = True
+        # wait until it exits
+        if self._thread:
+            # TODO: use callback, don't block here
+            self._thread.join()
+            self._thread = None
+
+        if self._ffplayer:
+            self._ffplayer = None
+        self._next_frame = None
+        self._size = (0, 0)
+        self._state = ''
+        self._seek_queue = []
+
+        # reset for next load since thread is dead for sure
+        self._ffplayer_need_quit = False
+        self._wakeup_queue = Queue(maxsize=1)

kivy/core/video/video_gstplayer.py

@@ -0,0 +1,140 @@
+'''
+Video Gstplayer
+===============
+
+.. versionadded:: 1.8.0
+
+Implementation of a VideoBase with Kivy :class:`~kivy.lib.gstplayer.GstPlayer`
+This player is the preferred player, using Gstreamer 1.0, working on both
+Python 2 and 3.
+'''
+
+try:
+    from kivy.lib.gstplayer import GstPlayer, get_gst_version
+except ImportError:
+    from kivy.core import handle_win_lib_import_error
+    handle_win_lib_import_error(
+        'VideoGstplayer', 'gst', 'kivy.lib.gstplayer._gstplayer')
+    raise
+from kivy.graphics.texture import Texture
+from kivy.core.video import VideoBase
+from kivy.logger import Logger
+from kivy.clock import Clock
+from kivy.compat import PY2
+from threading import Lock
+from functools import partial
+from os.path import realpath
+from weakref import ref
+
+if PY2:
+    from urllib import pathname2url
+else:
+    from urllib.request import pathname2url
+
+Logger.info('VideoGstplayer: Using Gstreamer {}'.format(
+    '.'.join(map(str, get_gst_version()))))
+
+
+def _on_gstplayer_buffer(video, width, height, data):
+    video = video()
+    # if we still receive the video but no more player, remove it.
+    if not video:
+        return
+    with video._buffer_lock:
+        video._buffer = (width, height, data)
+
+
+def _on_gstplayer_message(mtype, message):
+    if mtype == 'error':
+        Logger.error('VideoGstplayer: {}'.format(message))
+    elif mtype == 'warning':
+        Logger.warning('VideoGstplayer: {}'.format(message))
+    elif mtype == 'info':
+        Logger.info('VideoGstplayer: {}'.format(message))
+
+
+class VideoGstplayer(VideoBase):
+
+    def __init__(self, **kwargs):
+        self.player = None
+        self._buffer = None
+        self._buffer_lock = Lock()
+        super(VideoGstplayer, self).__init__(**kwargs)
+
+    def _on_gst_eos_sync(self):
+        Clock.schedule_once(self._do_eos, 0)
+
+    def load(self):
+        Logger.debug('VideoGstplayer: Load <{}>'.format(self._filename))
+        uri = self._get_uri()
+        wk_self = ref(self)
+        self.player_callback = partial(_on_gstplayer_buffer, wk_self)
+        self.player = GstPlayer(uri, self.player_callback,
+                                self._on_gst_eos_sync, _on_gstplayer_message)
+        self.player.load()
+
+    def unload(self):
+        if self.player:
+            self.player.unload()
+            self.player = None
+        with self._buffer_lock:
+            self._buffer = None
+        self._texture = None
+
+    def stop(self):
+        super(VideoGstplayer, self).stop()
+        self.player.stop()
+
+    def pause(self):
+        super(VideoGstplayer, self).pause()
+        self.player.pause()
+
+    def play(self):
+        super(VideoGstplayer, self).play()
+        self.player.set_volume(self.volume)
+        self.player.play()
+
+    def seek(self, percent, precise=True):
+        self.player.seek(percent)
+
+    def _get_position(self):
+        return self.player.get_position()
+
+    def _get_duration(self):
+        return self.player.get_duration()
+
+    def _set_volume(self, value):
+        self._volume = value
+        if self.player:
+            self.player.set_volume(self._volume)
+
+    def _update(self, dt):
+        buf = None
+        with self._buffer_lock:
+            buf = self._buffer
+            self._buffer = None
+        if buf is not None:
+            self._update_texture(buf)
+            self.dispatch('on_frame')
+
+    def _update_texture(self, buf):
+        width, height, data = buf
+
+        # texture is not allocated yet, create it first
+        if not self._texture:
+            self._texture = Texture.create(size=(width, height),
+                                           colorfmt='rgb')
+            self._texture.flip_vertical()
+            self.dispatch('on_load')
+
+        if self._texture:
+            self._texture.blit_buffer(
+                data, size=(width, height), colorfmt='rgb')
+
+    def _get_uri(self):
+        uri = self.filename
+        if not uri:
+            return
+        if '://' not in uri:
+            uri = 'file:' + pathname2url(realpath(uri))
+        return uri

kivy/core/video/video_null.py

@@ -0,0 +1,12 @@
+
+'''
+VideoNull: empty implementation of VideoBase for the no provider case
+'''
+
+from kivy.core.video import VideoBase
+
+
+class VideoNull(VideoBase):
+    '''VideoBase implementation when there is no provider.
+    '''
+    pass