问题描述
我编写了如下简单的流音频代码。
但是我不知道如何编写回调函数。
回调函数的第二个参数 samples 是指向要播放的数据的指针。
任何答复将不胜感激。
import vlc
import re
import requests
import ctypes
url = "http://serpent0.duckdns.org:8088/kbsfm.pls"
res = requests.get(url)
res.raise_for_status()
# retrieve url
p = re.compile("https://.+")
m = p.search(res.text)
url = m.group()
# AudioPlayCb = ctypes.CFUNCTYPE(None,ctypes.c_void_p,ctypes.c_uint,ctypes.c_int64)
@vlc.CallbackDecorators.AudioPlayCb
def play_callback(opaque,samples,count,pts):
"""
@param data: data pointer as passed to L{libvlc_audio_set_callbacks}() [IN].
@param samples: pointer to a table of audio samples to play back [IN].
@param count: number of audio samples to play back.
@param pts: expected play time stamp (see libvlc_delay()).
"""
# HOW DO I RETURN SOMETHING FROM HERE? (*)
pass
return buffer
instance = vlc.Instance(["--prefetch-buffer-size=2000 --prefetch-read-size=5000 --network-caching=1000"]) #define VLC instance
media = instance.media_new(url)
player = media.player_new_from_media()
player.audio_set_format("f32l",48000,2)
# PLAYS WELL WITHOUT THIS LINE (**)
player.audio_set_callbacks(play=play_callback,pause=None,resume=None,flush=None,drain=None,opaque=None)
player.play() #Play the media
c = input()
我写的播放回调函数如下。
我认为应该将传入的 buffer_array
复制到另一个缓冲区以播放样本。
@vlc.CallbackDecorators.AudioPlayCb
def play_callback(data,pts):
bytes_read = count * 4 * 2
buffer_array = ctypes.cast(samples,ctypes.POINTER(ctypes.c_char * bytes_read))
# This code is invalid. To do it right,where should buffer_array be copied to?
buffer = bytearray(bytes_read)
buffer[:] = buffer_array.contents
解决方法
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