如何解决Raspberry Pi 4上的PyAudio无法获得音频输出
这里有点茫然。目前，以下代码无法正常播放wav文件。我添加了一些打印语句，发现while循环永远不会结束。
我正在使用Raspberry Pi4。我使用...安装了PyAudio。
sudo apt-get install libasound-dev
sudo apt-get install portaudio19-dec
sudo apt-get install python3-pyaudio
奇怪的是录音作品。此外，也可以使用aplay soundfile.wav。
def play(fileName):
CHUNK = 1024
wf = wave.open(fileName,'rb')
p = pyaudio.PyAudio()
stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),channels=2,rate=wf.getframerate(),output=True,output_device_index=0)
data = wf.readframes(CHUNK)
print("starting loop")
while len(data) > 0: # also tried: while data != ''
stream.write(data)
data = wf.readframes(CHUNK)
print("finished loop")
stream.stop_stream()
stream.close()
p.terminate()
play("soundfile.wav")
上面的代码将导致以下消息。
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm,hwParams,&alsaPeriodFrames,&dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',line: 924
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm,line: 924
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.pcm.dsnoop.device'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM sysdefault
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.pcm.dsnoop.device'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5047:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM sysdefault
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.bluealsa.device'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5036:(snd_config_expand) Args evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM bluealsa
ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'defaults.bluealsa.device'
ALSA lib conf.c:4568:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5036:(snd_config_expand) Args evaluate error: No such file or directory
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM bluealsa
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm,line: 924
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM input
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm,line: 924
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,skipping unlock
starting loop
如果有人对可能是什么问题有任何见解，我将不胜感激。
解决方法
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