Python实现的视频播放器功能完整示例

# -*- coding:utf-8 -*-#! python3# ----------------------------------------------------------------------------# pyglet# Copyright (c) 2006-2008 Alex Holkner# All rights reserved.# # Redistribution and use in source and binary forms, with or without# modification, are permitted provided that the following conditions # are met:## * Redistributions of source code must retain the above copyright#  notice, this list of conditions and the following disclaimer.# * Redistributions in binary form must reproduce the above copyright #  notice, this list of conditions and the following disclaimer in#  the documentation and/or other materials provided with the#  distribution.# * Neither the name of pyglet nor the names of its#  contributors may be used to endorse or promote products#  derived from this software without specific prior written#  permission.## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE# POSSIBILITY OF SUCH DAMAGE.# ----------------------------------------------------------------------------'''Audio and video player with simple GUI controls.'''__docformat__ = 'restructuredtext'__version__ = '$Id: $'import sysfrom pyglet.gl import *import pygletfrom pyglet.window import keydef draw_rect(x, y, width, height):  glBegin(GL_LINE_LOOP)  glVertex2f(x, y)  glVertex2f(x + width, y)  glVertex2f(x + width, y + height)  glVertex2f(x, y + height)  glEnd()class Control(pyglet.event.EventDispatcher):  x = y = 0  width = height = 10  def __init__(self, parent):    super(Control, self).__init__()    self.parent = parent  def hit_test(self, x, y):#点中控件    return (self.x < x < self.x + self.width and         self.y < y < self.y + self.height)  def capture_events(self):    self.parent.push_handlers(self)  def release_events(self):    self.parent.remove_handlers(self)class Button(Control):  charged = False  def draw(self):    if self.charged:      glColor3f(0, 1, 0)    draw_rect(self.x, self.y, self.width, self.height)    glColor3f(1, 1, 1)    self.draw_label()  def on_mouse_press(self, x, y, button, modifiers):    self.capture_events()    self.charged = True  def on_mouse_drag(self, x, y, dx, dy, buttons, modifiers):    self.charged = self.hit_test(x, y)  def on_mouse_release(self, x, y, button, modifiers):    self.release_events()    if self.hit_test(x, y):      self.dispatch_event('on_press')    self.charged = FalseButton.register_event_type('on_press')#注册事件class TextButton(Button):  def __init__(self, *args, **kwargs):    super(TextButton, self).__init__(*args, **kwargs)    self._text = pyglet.text.Label('', anchor_x='center', anchor_y='center')  def draw_label(self):    self._text.x = self.x + self.width / 2    self._text.y = self.y + self.height / 2    self._text.draw()  def set_text(self, text):    self._text.text = text  text = property(lambda self: self._text.text,          set_text)class Slider(Control):  THUMB_WIDTH = 6  THUMB_HEIGHT = 10  GROOVE_HEIGHT = 2  def draw(self):    center_y = self.y + self.height / 2    draw_rect(self.x, center_y - self.GROOVE_HEIGHT / 2,          self.width, self.GROOVE_HEIGHT)    pos = self.x + self.value * self.width / (self.max - self.min)    draw_rect(pos - self.THUMB_WIDTH / 2, center_y - self.THUMB_HEIGHT / 2,          self.THUMB_WIDTH, self.THUMB_HEIGHT)  def coordinate_to_value(self, x):#改变进度    return float(x - self.x) / self.width * (self.max - self.min) + self.min  def on_mouse_press(self, x, y, button, modifiers):    value = self.coordinate_to_value(x)    self.capture_events()    self.dispatch_event('on_begin_scroll')    self.dispatch_event('on_change', value)  def on_mouse_drag(self, x, y, dx, dy, buttons, modifiers):    value = min(max(self.coordinate_to_value(x), self.min), self.max)    self.dispatch_event('on_change', value)  def on_mouse_release(self, x, y, button, modifiers):    self.release_events()    self.dispatch_event('on_end_scroll')Slider.register_event_type('on_begin_scroll')Slider.register_event_type('on_end_scroll')Slider.register_event_type('on_change')class PlayerWindow(pyglet.window.Window):  GUI_WIDTH = 400  GUI_HEIGHT = 40  GUI_PADDING = 4#按钮间隔  GUI_BUTTON_HEIGHT = 16  def __init__(self, player):    super(PlayerWindow, self).__init__(caption='Media Player',                      visible=False,                       resizable=True)    self.player = player    self.player.push_handlers(self)    self.player.eos_action = self.player.EOS_PAUSE    self.slider = Slider(self)    self.slider.x = self.GUI_PADDING#类变量    self.slider.y = self.GUI_PADDING * 2 + self.GUI_BUTTON_HEIGHT    self.slider.on_begin_scroll = lambda: player.pause()    self.slider.on_end_scroll = lambda: player.play()    self.slider.on_change = lambda value: player.seek(value)    self.play_pause_button = TextButton(self)    self.play_pause_button.x = self.GUI_PADDING    self.play_pause_button.y = self.GUI_PADDING    self.play_pause_button.height = self.GUI_BUTTON_HEIGHT    self.play_pause_button.width = 45    self.play_pause_button.on_press = self.on_play_pause    win = self#自有妙用    self.window_button = TextButton(self)    self.window_button.x = self.play_pause_button.x + /                self.play_pause_button.width + self.GUI_PADDING    self.window_button.y = self.GUI_PADDING    self.window_button.height = self.GUI_BUTTON_HEIGHT    self.window_button.width = 90    self.window_button.text = 'Windowed'    self.window_button.on_press = lambda: win.set_fullscreen(False)#注意不能写self    self.controls = [      self.slider,       self.play_pause_button,      self.window_button,    ]    x = self.window_button.x + self.window_button.width + self.GUI_PADDING    i = 0    for screen in self.display.get_screens():      screen_button = TextButton(self)      screen_button.x = x      screen_button.y = self.GUI_PADDING      screen_button.height = self.GUI_BUTTON_HEIGHT      screen_button.width = 80      screen_button.text = 'Screen %d' % (i + 1)      screen_button.on_press = /        (lambda s: lambda: win.set_fullscreen(True, screen=s))(screen)      self.controls.append(screen_button)      i += 1      x += screen_button.width + self.GUI_PADDING  def on_eos(self):    self.gui_update_state()  def gui_update_source(self):    if self.player.source:      source = self.player.source      self.slider.min = 0.      self.slider.max = source.duration    self.gui_update_state()  def gui_update_state(self):    if self.player.playing:      self.play_pause_button.text = 'Pause'    else:      self.play_pause_button.text = 'Play'  def get_video_size(self):    if not self.player.source or not self.player.source.video_format:      return 0, 0    video_format = self.player.source.video_format    width = video_format.width    height = video_format.height    if video_format.sample_aspect > 1:      width *= video_format.sample_aspect    elif video_format.sample_aspect < 1:      height /= video_format.sample_aspect    return width, height  def set_default_video_size(self):    '''Make the window size just big enough to show the current    video and the GUI.'''    width = self.GUI_WIDTH    height = self.GUI_HEIGHT    video_width, video_height = self.get_video_size()    width = max(width, video_width)    height += video_height    self.set_size(int(width), int(height))  def on_resize(self, width, height):    '''Position and size video image.'''    super(PlayerWindow, self).on_resize(width, height)    self.slider.width = width - self.GUI_PADDING * 2    height -= self.GUI_HEIGHT    if height <= 0:      return    video_width, video_height = self.get_video_size()    if video_width == 0 or video_height == 0:      return    display_aspect = width / float(height)    video_aspect = video_width / float(video_height)    if video_aspect > display_aspect:      self.video_width = width      self.video_height = width / video_aspect    else:      self.video_height = height      self.video_width = height * video_aspect    self.video_x = (width - self.video_width) / 2    self.video_y = (height - self.video_height) / 2 + self.GUI_HEIGHT  def on_mouse_press(self, x, y, button, modifiers):    for control in self.controls:      if control.hit_test(x, y):        control.on_mouse_press(x, y, button, modifiers)  def on_key_press(self, symbol, modifiers):    if symbol == key.SPACE:      self.on_play_pause()    elif symbol == key.ESCAPE:      self.dispatch_event('on_close')  def on_close(self):    self.player.pause()    self.close()  def on_play_pause(self):    if self.player.playing:      self.player.pause()    else:      if self.player.time >= self.player.source.duration:#如果放完了        self.player.seek(0)      self.player.play()    self.gui_update_state()  def on_draw(self):    self.clear()    # Video    if self.player.source and self.player.source.video_format:      self.player.get_texture().blit(self.video_x,                      self.video_y,                      width=self.video_width,                      height=self.video_height)    # GUI    self.slider.value = self.player.time    for control in self.controls:      control.draw()if __name__ == '__main__':  if len(sys.argv) < 2:    print('Usage: media_player.py <filename> [<filename> ...]')    sys.exit(1)  for filename in sys.argv[1:]:    player = pyglet.media.Player()    window = PlayerWindow(player)    source = pyglet.media.load(filename)    player.queue(source)    window.gui_update_source()    window.set_default_video_size()    window.set_size(400,400)    window.set_visible(True)    window.gui_update_state()    player.play()  pyglet.app.run()