我想用我的电脑作为声音放大器。基本上从麦克风中捕获音频,并从同一台PC的扬声器播放放大的声音。我使用此代码:
#!/usr/bin/env python
import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject, Gst, Gtk
GObject.threads_init()
Gst.init(None)
pipeline = Gst.Pipeline()
auto = Gst.ElementFactory.make("autoaudiosrc", "autoaudiosrc")
capsfilter = Gst.ElementFactory.make("capsfilter", "capsfilter")
capsfilter.caps = Gst.caps_from_string('audio/x-raw')
level = Gst.ElementFactory.make("level", "audiolevel")
level.props.interval = 50000000
audiosink = Gst.ElementFactory.make("autoaudiosink", "audiosink")
pipeline.add(auto)
pipeline.add(capsfilter)
pipeline.add(level)
pipeline.add(audiosink)
auto.link(capsfilter)
capsfilter.link(level)
level.link(audiosink)
class ProgressBarWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="ProgressBar Demo")
self.set_border_width(10)
vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)
self.add(vbox)
self.progressbar = Gtk.ProgressBar()
vbox.pack_start(self.progressbar, True, True, 0)
bus = pipeline.get_bus()
bus.add_signal_watch_full(1)
bus.connect("message", self.on_messages)
pipeline.set_state(Gst.State.PLAYING)
def on_messages(self, bus, message):
t = message.type
if t == Gst.MessageType.ELEMENT:
structure = message.get_structure()
if structure.get_name() == "level":
rms = structure.get_value("rms")[0]
if rms < -50:
rms = -50
rep = rms + 50
self.progressbar.set_fraction(rep/50 + 0.1)
self.progressbar.set_text(str(int(rms)) + " dB")
self.progressbar.set_show_text(1)
win = ProgressBarWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()
但是当我运行python代码并增加扬声器音量时,播放会变得嘈杂并发生无限的声音循环。我知道这是物理因素,因为麦克风也会一次又一次地捕捉扬声器的声音。但有没有基于pythonic或软件的方法来防止这种情况?感谢。
答案 0 :(得分:0)
如果引入时间延迟(可能是FIFO缓冲区),则可以避免反馈尖叫。这样渲染的音频就没有实时的前向反馈循环。