Python vlc检查歌曲是否正在播放

Question

我有一个Python脚本：

import mysql.connector
import os
import time
import vlc
from subprocess import Popen
from mysql.connector import Error

def program():
    connection = mysql.connector.connect(host='localhost',
                                         database='broadcast',
                                         user='****',
                                         password='****')
    if connection.is_connected():
        db_Info = connection.get_server_info()
        print("Connected to MySQL Server version ", db_Info)
        cursor = connection.cursor()
        cursor.execute("select database();")
        record = cursor.fetchone()
        print("You're connected to database: ", record)
        
    sql_select_Query = "select * from broadcast WHERE datumtijd BETWEEN now() - INTERVAL 1 MINUTE AND now()"
    cursor = connection.cursor()
    cursor.execute(sql_select_Query)
    # get all records
    records = cursor.fetchall()
    print("Total number of rows in table: ", cursor.rowcount)
    print("\n")

    #print("\nPrinting each row")
    for row in records:
        print("\nPrinting each row")
        print("id = ", row[0], )
        print("date_time  = ", row[1])
        print("audiofile  = ", row[2], "\n")
        player = vlc.MediaPlayer('/home/pi/Music/' + row[2])
        player.play()
        
        
runprogram = True
while runprogram:
    program()
    time.sleep(10)

这段代码检查mysql数据库中是否有记录，如果时间匹配，它将播放这首歌。到目前为止没有问题，但是脚本在10秒的时间循环中运行。10秒后，同一首歌再次播放，所以在那一刻有2首歌在播放。再过10秒，它开始了第三次，等等，ect。

有没有可能更改我的代码，所以如果有一首歌正在播放，它不会启动另一首歌。如果是，我需要添加/更改哪些内容才能使其工作。

Gr。埃德温

Answer 1

只需在player仍在使用while循环时将其打开即可。

例如：

import time
import vlc

input_files = ['punish.mp3', 'trial.wav', 'punish2.mp3']

def program():
    for row in input_files:
        print("Playing: ", row)
        player = vlc.MediaPlayer('../'+row)
        player.play()
        time.sleep(1) # allow player to start
        while player.is_playing():
            time.sleep(1)        
        
runprogram = True
while runprogram:
    program()
    print("Finished: Looping for more audio")
    time.sleep(10)

输出：

python 20220227.py
Playing:  punish.mp3
Playing:  trial.wav
Playing:  punish2.mp3
Finished: Looping for more audio
Playing:  punish.mp3
Playing:  trial.wav
Playing:  punish2.mp3
Finished: Looping for more audio
Playing:  punish.mp3

Answer 2

我发现了这个：https://www.olivieraubert.net/vlc/python-ctypes/doc/vlc.MediaPlayer-class.html#is_playing

基本上，有一种检查球员是否已经在玩的方法(player.is_playing())。因此，您只需在代码中的某个地方保留对vlc.MediaPlayer的引用，然后在再次启动播放机之前检查它是否正在播放。