You can do print[sd.query_devices[]]
to print out all devices that you may use, for example
> 1 Mikrofon [3 — Urzadzenie zgodne, MME [2 in, 0 out]
2 Mikrofon [3 — Urzadzenie zgodne, MME [2 in, 0 out]
3 Mapowanie dzwieku Microsoft - Output, MME [0 in, 2 out]
< 4 Sluchawki [3 — Urzadzenie zgodn, MME [0 in, 2 out]
5 Glosniki [3 — Urzadzenie zgodne, MME [0 in, 2 out]
Right now you can see, that there is an input device with index 1 and an output device with index 4.
You can now set your pair of in/out devices by typing
sd.default.device = [index_of_input_device,index_of_output_device]
Questions : Change audio output device with python
2022-09-08T21:39:19+00:00 2022-09-08T21:39:19+00:00
649
I want to capture computer output, run it anycodings_audio-streaming through a neural network, then play back the anycodings_audio-streaming audio in real time. So far I have found anycodings_audio-streaming BlackHole:
import sounddevice as sd
sd.default.device = 'BlackHole 2ch'
This works great for capturing output. The anycodings_audio-streaming problem is I want to capture the audio with anycodings_audio-streaming BlackHole, then feed audio back to the anycodings_audio-streaming speaker output in real time. Setting anycodings_audio-streaming sd.default.device = "MacBook Pro Speakers anycodings_audio-streaming does not change the system audio output [it anycodings_audio-streaming is still going to BlackHole]. How can I anycodings_audio-streaming programmatically change the device audio anycodings_audio-streaming output?
Total Answers 1
33
Answers 1 : of Change audio output device with python
You can do print[sd.query_devices[]] to anycodings_audio-streaming print out all devices that you may use, anycodings_audio-streaming for example
> 1 Mikrofon [3 — Urzadzenie zgodne, MME [2 in, 0 out]
2 Mikrofon [3 — Urzadzenie zgodne, MME [2 in, 0 out]
3 Mapowanie dzwieku Microsoft - Output, MME [0 in, 2 out]
< 4 Sluchawki [3 — Urzadzenie zgodn, MME [0 in, 2 out]
5 Glosniki [3 — Urzadzenie zgodne, MME [0 in, 2 out]
Right now you can see, that there is an anycodings_audio-streaming input device with index 1 and an output anycodings_audio-streaming device with index 4.
You can now set your pair of in/out anycodings_audio-streaming devices by typing
sd.default.device = anycodings_audio-streaming [index_of_input_device,index_of_output_device]
0
2022-09-08T21:39:19+00:00 2022-09-08T21:39:19+00:00Answer Link
mRahman
Deprecated since version 3.11: The ossaudiodev
module is deprecated [see
PEP 594 for details].
This module allows you to access the OSS [Open Sound System] audio interface. OSS is available for a wide range of open-source and commercial Unices, and is the standard audio interface for Linux and recent versions of FreeBSD.
Changed in version 3.3: Operations in this module now raise
OSError
where IOError
was raised.
See also
Open Sound System Programmer’s Guidethe official documentation for the OSS C API
The module defines a large number of constants
supplied by the OSS device driver; see on either Linux or FreeBSD for a listing.
ossaudiodev
defines the following variables and functions:
ossaudiodev.
OSSAudioError
¶This exception is raised on certain errors. The argument is a string describing what went wrong.
[If
ossaudiodev
receives an error from a system call such as open[]
, write[]
, or ioctl[]
, it raises OSError
. Errors detected directly by
ossaudiodev
result in OSSAudioError
.]
[For backwards compatibility, the exception class is also available as ossaudiodev.error
.]
ossaudiodev.
open
[mode]¶ ossaudiodev.
open
[device, mode]Open an audio device and return an OSS audio device object. This object supports many file-like methods, such as read[]
, write[]
, and fileno[]
[although
there are subtle differences between conventional Unix read/write semantics and those of OSS audio devices]. It also supports a number of audio-specific methods; see below for the complete list of methods.
device is the audio device filename to use. If it is not specified, this module first looks in the environment variable AUDIODEV
for a device to use. If not found, it falls back to /dev/dsp
.
mode is one of 'r'
for read-only [record]
access, 'w'
for write-only [playback] access and 'rw'
for both. Since many sound cards only allow one process to have the recorder or player open at a time, it is a good idea to open the device only for the activity needed. Further, some sound cards are half-duplex: they can be opened for reading or writing, but not both at once.
Note the unusual calling syntax: the first argument is optional, and the second is required. This is a historical artifact for compatibility
with the older linuxaudiodev
module which ossaudiodev
supersedes.
ossaudiodev.
openmixer
[[device]]¶Open a mixer device and return an OSS mixer device object. device is the mixer device filename to use. If it is not specified, this module first looks in the environment variable MIXERDEV
for a
device to use. If not found, it falls back to /dev/mixer
.
Audio Device Objects¶
Before you can write to or read from an audio device, you must call three methods in the correct order:
setfmt[]
to set the output formatchannels[]
to set the number of channelsspeed[]
to set the sample rate
Alternately, you can use the setparameters[]
method to set all three audio parameters at once. This is more convenient, but may not be as flexible in all cases.
The audio device objects returned by open[]
define the following methods and [read-only] attributes:
oss_audio_device.
close
[]¶Explicitly close the audio device. When you are done writing to or reading from an audio device, you should explicitly close it. A closed device cannot be used again.
oss_audio_device.
fileno
[]¶Return the file descriptor associated with the device.
oss_audio_device.
read
[size]¶Read size bytes from the audio input and return them as a Python string. Unlike most Unix device drivers, OSS audio devices in blocking mode [the default] will block
read[]
until the entire requested amount of data is available.
oss_audio_device.
write
[data]¶Write a bytes-like object data to the audio device and return the number of bytes written. If the audio device is in
blocking mode [the default], the entire data is always written [again, this is different from usual Unix device semantics]. If the device is in non-blocking mode, some data may not be written—see writeall[]
.
oss_audio_device.
writeall
[data]¶Write a bytes-like object data to the audio device: waits until the audio device is able to accept data, writes
as much data as it will accept, and repeats until data has been completely written. If the device is in blocking mode [the default], this has the same effect as write[]
;
writeall[]
is only useful in non-blocking mode. Has no return value, since the amount of data written is always equal to the amount of data supplied.
Changed in version 3.2: Audio device objects also support the context management protocol, i.e. they can be used in a
with
statement.
The following methods each map to exactly one ioctl[]
system call. The correspondence is obvious: for example, setfmt[]
corresponds to the SNDCTL_DSP_SETFMT
ioctl, and sync[]
to SNDCTL_DSP_SYNC
[this can be useful when consulting the OSS documentation]. If the underlying ioctl[]
fails, they all raise
OSError
.
oss_audio_device.
nonblock
[]¶Put the device into non-blocking mode. Once in non-blocking mode, there is no way to return it to blocking mode.
oss_audio_device.
getfmts
[]¶Return a bitmask of the audio output formats supported by the soundcard. Some of the formats supported by OSS are:
| a logarithmic encoding [used by Sun |
| a logarithmic encoding |
| a 4:1 compressed format defined by the Interactive Multimedia Association |
| Unsigned, 8-bit audio |
| Signed, 16-bit audio, little-endian byte order [as used by Intel processors] |
| Signed, 16-bit audio, big-endian byte order [as used by 68k, PowerPC, Sparc] |
| Signed, 8 bit audio |
| Unsigned, 16-bit little-endian audio |
| Unsigned, 16-bit big-endian audio |
Consult the OSS documentation for a full list of audio formats, and note that most devices support only a subset of these formats. Some older devices only support AFMT_U8
; the most common format used today is AFMT_S16_LE
.
oss_audio_device.
setfmt
[format]¶Try to set the current audio format to format—see
getfmts[]
for a list. Returns the audio format that the device was set to, which may not be the requested format. May also be used to return the current audio format—do this by passing an “audio format” of AFMT_QUERY
.
oss_audio_device.
channels
[nchannels]¶Set the number of output channels to nchannels. A value of 1 indicates monophonic sound, 2 stereophonic. Some devices may have more than 2 channels, and some high-end devices may not support mono. Returns the number of channels the device was set to.
oss_audio_device.
speed
[samplerate]¶Try to set the audio sampling rate to samplerate samples per second. Returns the rate actually set. Most sound devices don’t support arbitrary sampling rates. Common rates are:
8000 | default rate for |
11025 | speech recording |
22050 | |
44100 | CD quality audio [at 16 bits/sample and 2 channels] |
96000 | DVD quality audio [at 24 bits/sample] |
oss_audio_device.
sync
[]¶Wait until the sound device has played every byte in its buffer. [This happens implicitly when the device is closed.] The OSS documentation recommends closing and re-opening the device rather than using sync[]
.
oss_audio_device.
reset
[]¶Immediately stop playing or recording and return the device to a
state where it can accept commands. The OSS documentation recommends closing and re-opening the device after calling reset[]
.
oss_audio_device.
post
[]¶Tell the driver that there is likely to be a pause in the output, making it possible for the device to handle the pause more intelligently. You might use this after playing a spot sound effect, before waiting for user input, or before doing disk I/O.
The following convenience methods combine several ioctls, or one ioctl and some simple calculations.
oss_audio_device.
setparameters
[format, nchannels, samplerate[, strict=False]]¶Set
the key audio sampling parameters—sample format, number of channels, and sampling rate—in one method call. format, nchannels, and samplerate should be as specified in the setfmt[]
,
channels[]
, and speed[]
methods. If strict is true,
setparameters[]
checks to see if each parameter was actually set to the requested value, and raises OSSAudioError
if not. Returns a tuple [format, nchannels, samplerate]
indicating the parameter values that were actually set by the device driver [i.e., the same as the return values of setfmt[]
, channels[]
, and
speed[]
].
For example,
[fmt, channels, rate] = dsp.setparameters[fmt, channels, rate]
is equivalent to
fmt = dsp.setfmt[fmt] channels = dsp.channels[channels] rate = dsp.rate[rate]
oss_audio_device.
bufsize
[]¶Returns the size of the hardware buffer, in samples.
oss_audio_device.
obufcount
[]¶Returns the number of samples that are in the hardware buffer yet to be played.
oss_audio_device.
obuffree
[]¶Returns the number of samples that could be queued into the hardware buffer to be played without blocking.
Audio device objects also support several read-only attributes:
oss_audio_device.
closed
¶Boolean indicating whether the device has been closed.
oss_audio_device.
name
¶String containing the name of the device file.
oss_audio_device.
mode
¶
The I/O mode for the file, either "r"
, "rw"
, or "w"
.
Mixer Device Objects¶
The mixer object provides two file-like methods:
oss_mixer_device.
close
[]¶This method closes the open mixer device file. Any further attempts to use the mixer after this file is closed will raise an OSError
.
oss_mixer_device.
fileno
[]¶Returns the file handle number of the open mixer device file.
Changed in version 3.2: Mixer objects also support the context management protocol.
The remaining methods are specific to audio mixing:
oss_mixer_device.
controls
[]¶This method returns a bitmask specifying the available mixer controls [“Control” being a specific mixable “channel”, such as SOUND_MIXER_PCM
or SOUND_MIXER_SYNTH
]. This bitmask indicates a subset of all available mixer controls—the SOUND_MIXER_*
constants defined
at module level. To determine if, for example, the current mixer object supports a PCM mixer, use the following Python code:
mixer=ossaudiodev.openmixer[] if mixer.controls[] & [1