在pyaudio中使用rate/format/chunk中的任何其他值会导致错误：[Errno Input overflowed]-9981

Question

操作系统：Mac OSX 10.7.5 Python:Python 2.7.3（自制） pyaudio:0.2.7 portaudio:19.20111121（自制-portaudio）

以下脚本输出以下内容并显示我遇到的问题：

#!/usr/bin/env python
import pyaudio
from pprint import pprint

p = pyaudio.PyAudio()


# SUCCEEDS
pprint(p.is_format_supported(input_format=pyaudio.paInt8,input_channels=1,rate=44100,input_device=0)) # => True
try:
    stream = p.open(format=pyaudio.paInt8,channels=1,rate=44100,input=True,frames_per_buffer=1024)
    data = stream.read(1024)
except IOError as e:
    print 'This never happens: '+str(e)

# FAILS
pprint(p.is_format_supported(input_format=pyaudio.paInt8,input_channels=1,rate=22050,input_device=0)) # => True
try:
    stream = p.open(format=pyaudio.paInt8,channels=1,rate=22050,input=True,frames_per_buffer=1024)
    data = stream.read(1024)
except IOError as e:
    print 'This fails: '+str(e)

# FAILS
pprint(p.is_format_supported(input_format=pyaudio.paInt8,input_channels=1,rate=22050,input_device=0)) # => True
try:
    stream = p.open(format=pyaudio.paInt8,channels=1,rate=22050,input=True,frames_per_buffer=512)
    data = stream.read(1024)
except IOError as e:
    print 'This also fails: '+str(e)

# FAILS
pprint(p.is_format_supported(input_format=pyaudio.paInt8,input_channels=1,rate=11025,input_device=0)) # => True
try:
    stream = p.open(format=pyaudio.paInt8,channels=1,rate=11025,input=True,frames_per_buffer=512)
    data = stream.read(1024)
except IOError as e:
    print 'This also fails as well: '+str(e)

stream.stop_stream()
stream.close()
p.terminate()

以上输出如下：

True
True
This fails: [Errno Input overflowed] -9981
True
This also fails: [Errno Input overflowed] -9981
True
This also fails as well: [Errno Input overflowed] -9981

Answer 1

尽管上面的注释表明stop_stream（）和close（）没有修复它，但是像这样关闭它们对我来说很有用：

#!/usr/bin/env python
import pyaudio
from pprint import pprint

p = pyaudio.PyAudio()

pprint(p.is_format_supported(input_format=pyaudio.paInt8,
                             input_channels=1,
                             rate=44100,
                             input_device=0))
try:
    stream = p.open(format=pyaudio.paInt8,
                    channels=1,
                    rate=44100,
                    input=True,
                    input_device_index=0,
                    frames_per_buffer=1024)
    data = stream.read(1024)

except IOError as e:
    print e
stream.stop_stream()
stream.close()

pprint(p.is_format_supported(input_format=pyaudio.paInt8,
                              input_channels=1,
                              rate=22050,
                              input_device=0))

try:
    stream = p.open(format=pyaudio.paInt8,
                    channels=1,
                    rate=22050,
                    input=True,
                    input_device_index=0,
                    frames_per_buffer=1024)
    data = stream.read(1024)

except IOError as e:
    print e
stream.stop_stream()
stream.close()

p.terminate()

这将为不支持的速率（异常）提供预期结果：

Traceback (most recent call last):
  File "testaudio.py", line 28, in <module>
    input_device=2))
  File "/usr/lib64/python2.7/site-packages/pyaudio.py", line 934, in is_format_supported
    return pa.is_format_supported(rate, **kwargs)
ValueError: ('Invalid sample rate', -9997)

Answer 2

如果要检查您的操作系统和硬件是否支持所需的格式、频道、速率等设置，请执行以下操作：

import pyaudio
soundObj = pyaudio.PyAudio()

# Learn what your OS+Hardware can do
defaultCapability = soundObj.get_default_host_api_info()
print defaultCapability

# See if you can make it do what you want
isSupported = soundObj.is_format_supported(input_format=pyaudio.paInt8, input_channels=1, rate=22050, input_device=0)
print isSupported

isSupported将是True，因为您的系统可以处理您的设置。内存溢出错误可能是由于某些OS+硬件问题造成的。您必须检查默认的主机API实际上可以做什么。您不需要通过“stream类”来“打开”和“关闭”查询soundObj。

看看这个问题：PyAudio Input overflowed

有关其他pyaudio文档和帮助，请访问：

http://people.csail.mit.edu/hubert/pyaudio/docs/

编辑：

原来，“Errno Input overflowed-9981”不是一个小问题：http://trac.macports.org/ticket/39150

我看到你有最新的portaudio版本（19.20111121），但是19.20111121_4声称已经修复了这个错误。看看升级portaudio是否有效。