用 Python 在多个输出设备上播放多个声音文件
用 Python 在多个输出设备上播放多个声音文件有想过用一台主机给不同的设备同时播放不同的音频文件吗？如果你正准备搭建一个DJ应用，需要实现一副耳机和一组扬声器的混音效果；又或者你需要构建一组包含许多个扬声器的音乐系统，而每个扬声器都需要播放不同的音频文件，彼此之间需要实现同步…… 下面这个 DEMO 演示了用树莓派驱动8个不同的扬声器，分别播放8种不同的单声道音频文件，不仅有视频，更有必要的说明：
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下面是所用的的零部件清单。
[*]功放板
[*]USB 声卡
[*]DC/DC变压器
[*]USB HUB
[*]DC 接线端子
所需要的项目源代码在这里：https://github.com/esologic/pear参照图片连接树莓派、USB 声卡、功放、USB HUB、扬声器和电源。
Multi-Audio 范例首先给树莓派安装 sounddevice，用下面的命令即可。
sudo apt-get install python3-pip python3-numpy libportaudio2 libsndfile1
python3 -m pip install sounddevice soundfile
这里有4个音频文件，和 multi.py 在同一个目录下，目录结构如下。multi_audio/├──1.wav├──2.wav├──3.wav├──4.wav└──multi.py 这段代码基于Python 的 sounddevice 库。
"""
multi.py, uses the sounddevice library to play multiple audio files to multiple output devices at the same time
Written by Devon Bray (dev@esologic.com)
"""
import sounddevice
import soundfile
import threading
import os
DATA_TYPE = "float32"
def load_sound_file_into_memory(path):
"""
Get the in-memory version of a given path to a wav file
:param path: wav file to be loaded
:return: audio_data, a 2D numpy array
"""
audio_data, _ = soundfile.read(path, dtype=DATA_TYPE)
return audio_data
def get_device_number_if_usb_soundcard(index_info):
"""
Given a device dict, return True if the device is one of our USB sound cards and False if otherwise
:param index_info: a device info dict from PyAudio.
:return: True if usb sound card, False if otherwise
"""
index, info = index_info
if "USB Audio Device" in info["name"]:
return index
return False
def play_wav_on_index(audio_data, stream_object):
"""
Play an audio file given as the result of `load_sound_file_into_memory`
:param audio_data: A two-dimensional NumPy array
:param stream_object: a sounddevice.OutputStream object that will immediately start playing any data written to it.
:return: None, returns when the data has all been consumed
"""
stream_object.write(audio_data)
def create_running_output_stream(index):
"""
Create an sounddevice.OutputStream that writes to the device specified by index that is ready to be written to.
You can immediately call `write` on this object with data and it will play on the device.
:param index: the device index of the audio device to write to
:return: a started sounddevice.OutputStream object ready to be written to
"""
output = sounddevice.OutputStream(
device=index,
dtype=DATA_TYPE
)
output.start()
return output
if __name__ == "__main__":
def good_filepath(path):
"""
Macro for returning false if the file is not a non-hidden wav file
:param path: path to the file
:return: true if a non-hidden wav, false if not a wav or hidden
"""
return str(path).endswith(".wav") and (not str(path).startswith("."))
cwd = os.getcwd()
sound_file_paths = [
os.path.join(cwd, path) for path in sorted(filter(lambda path: good_filepath(path), os.listdir(cwd)))
]
print("Discovered the following .wav files:", sound_file_paths)
files =
print("Files loaded into memory, Looking for USB devices.")
usb_sound_card_indices = list(filter(lambda x: x is not False,
map(get_device_number_if_usb_soundcard,
)))
print("Discovered the following usb sound devices", usb_sound_card_indices)
streams =
running = True
if not len(streams) > 0:
running = False
print("No audio devices found, stopping")
if not len(files) > 0:
running = False
print("No sound files found, stopping")
while running:
print("Playing files")
threads = )
for file_path, stream in zip(files, streams)]
try:
for thread in threads:
thread.start()
for thread, device_index in zip(threads, usb_sound_card_indices):
print("Waiting for device", device_index, "to finish")
thread.join()
except KeyboardInterrupt:
running = False
print("Stopping stream")
for stream in streams:
stream.abort(ignore_errors=True)
stream.close()
print("Streams stopped")
print("Bye.")
运行之后将分别在3个设备上播放 1.wav、2.wav 和 3.wav音频文件。
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