Fonction de lecteur vidéo implémentée en Python

Cet article présente principalement la fonction de lecture vidéo implémentée en Python et analyse les compétences opérationnelles associées de Python basées sur la bibliothèque pyglet pour implémenter la fonction de lecture vidéo sous la forme d'un exemple complet. Les amis dans le besoin peuvent se référer à l'exemple. de cet article

Décrit la fonction de lecteur vidéo implémentée en Python. Partagez-le avec tout le monde pour référence, comme suit :

# -*- 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 sys
from pyglet.gl import *
import pyglet
from pyglet.window import key
def 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(&#39;on_press&#39;)
    self.charged = False
Button.register_event_type(&#39;on_press&#39;)#注册事件
class TextButton(Button):
  def __init__(self, *args, **kwargs):
    super(TextButton, self).__init__(*args, **kwargs)
    self._text = pyglet.text.Label(&#39;&#39;, anchor_x=&#39;center&#39;, anchor_y=&#39;center&#39;)
  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(&#39;on_begin_scroll&#39;)
    self.dispatch_event(&#39;on_change&#39;, 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(&#39;on_change&#39;, value)
  def on_mouse_release(self, x, y, button, modifiers):
    self.release_events()
    self.dispatch_event(&#39;on_end_scroll&#39;)
Slider.register_event_type(&#39;on_begin_scroll&#39;)
Slider.register_event_type(&#39;on_end_scroll&#39;)
Slider.register_event_type(&#39;on_change&#39;)
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=&#39;Media Player&#39;,
                      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 = &#39;Windowed&#39;
    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 = &#39;Screen %d&#39; % (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 = &#39;Pause&#39;
    else:
      self.play_pause_button.text = &#39;Play&#39;
  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):
    &#39;&#39;&#39;Make the window size just big enough to show the current
    video and the GUI.&#39;&#39;&#39;
    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):
    &#39;&#39;&#39;Position and size video image.&#39;&#39;&#39;
    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(&#39;on_close&#39;)
  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__ == &#39;__main__&#39;:
  if len(sys.argv) < 2:
    print(&#39;Usage: media_player.py <filename> [<filename> ...]&#39;)
    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()

Recommandations associées :

Utilisez Python pour implémenter le code d'exemple de fonction de téléchargement vidéo

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!