本文实例讲述了Python实现的视频播放器功能。分享给大家供大家参考，具体如下：
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# -*- 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() |
注：这里用到的pyglet库，可点击此处下载https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyglet
希望本文所述对大家Python程序设计有所帮助。
