author | Shane McErlean <shane.mcerlean@accenture.com> |
Fri, 27 Aug 2010 15:33:49 +0100 | |
changeset 101 | 1e82a8be084a |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`ossaudiodev` --- Access to OSS-compatible audio devices |
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============================================================= |
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.. module:: ossaudiodev |
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:platform: Linux, FreeBSD |
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:synopsis: Access to OSS-compatible audio devices. |
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.. versionadded:: 2.3 |
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This module allows you to access the OSS (Open Sound System) audio interface. |
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OSS is available for a wide range of open-source and commercial Unices, and is |
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the standard audio interface for Linux and recent versions of FreeBSD. |
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.. Things will get more complicated for future Linux versions, since |
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ALSA is in the standard kernel as of 2.5.x. Presumably if you |
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use ALSA, you'll have to make sure its OSS compatibility layer |
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is active to use ossaudiodev, but you're gonna need it for the vast |
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majority of Linux audio apps anyways. |
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Sounds like things are also complicated for other BSDs. In response |
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to my python-dev query, Thomas Wouters said: |
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> Likewise, googling shows OpenBSD also uses OSS/Free -- the commercial |
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> OSS installation manual tells you to remove references to OSS/Free from the |
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> kernel :) |
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but Aleksander Piotrowsk actually has an OpenBSD box, and he quotes |
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from its <soundcard.h>: |
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> * WARNING! WARNING! |
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> * This is an OSS (Linux) audio emulator. |
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> * Use the Native NetBSD API for developing new code, and this |
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> * only for compiling Linux programs. |
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There's also an ossaudio manpage on OpenBSD that explains things |
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further. Presumably NetBSD and OpenBSD have a different standard |
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audio interface. That's the great thing about standards, there are so |
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many to choose from ... ;-) |
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This probably all warrants a footnote or two, but I don't understand |
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things well enough right now to write it! --GPW |
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.. seealso:: |
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`Open Sound System Programmer's Guide <http://www.opensound.com/pguide/oss.pdf>`_ |
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the official documentation for the OSS C API |
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The module defines a large number of constants supplied by the OSS device |
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driver; see ``<sys/soundcard.h>`` on either Linux or FreeBSD for a listing . |
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:mod:`ossaudiodev` defines the following variables and functions: |
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.. exception:: OSSAudioError |
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This exception is raised on certain errors. The argument is a string describing |
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what went wrong. |
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(If :mod:`ossaudiodev` receives an error from a system call such as |
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:cfunc:`open`, :cfunc:`write`, or :cfunc:`ioctl`, it raises :exc:`IOError`. |
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Errors detected directly by :mod:`ossaudiodev` result in :exc:`OSSAudioError`.) |
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(For backwards compatibility, the exception class is also available as |
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``ossaudiodev.error``.) |
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.. function:: open([device, ]mode) |
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Open an audio device and return an OSS audio device object. This object |
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supports many file-like methods, such as :meth:`read`, :meth:`write`, and |
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:meth:`fileno` (although there are subtle differences between conventional Unix |
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read/write semantics and those of OSS audio devices). It also supports a number |
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of audio-specific methods; see below for the complete list of methods. |
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*device* is the audio device filename to use. If it is not specified, this |
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module first looks in the environment variable :envvar:`AUDIODEV` for a device |
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to use. If not found, it falls back to :file:`/dev/dsp`. |
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*mode* is one of ``'r'`` for read-only (record) access, ``'w'`` for |
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write-only (playback) access and ``'rw'`` for both. Since many sound cards |
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only allow one process to have the recorder or player open at a time, it is a |
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good idea to open the device only for the activity needed. Further, some |
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sound cards are half-duplex: they can be opened for reading or writing, but |
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not both at once. |
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Note the unusual calling syntax: the *first* argument is optional, and the |
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second is required. This is a historical artifact for compatibility with the |
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older :mod:`linuxaudiodev` module which :mod:`ossaudiodev` supersedes. |
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.. XXX it might also be motivated |
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by my unfounded-but-still-possibly-true belief that the default |
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audio device varies unpredictably across operating systems. -GW |
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.. function:: openmixer([device]) |
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Open a mixer device and return an OSS mixer device object. *device* is the |
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mixer device filename to use. If it is not specified, this module first looks |
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in the environment variable :envvar:`MIXERDEV` for a device to use. If not |
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found, it falls back to :file:`/dev/mixer`. |
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.. _ossaudio-device-objects: |
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|
106 |
|
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107 |
Audio Device Objects |
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108 |
-------------------- |
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|
109 |
|
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110 |
Before you can write to or read from an audio device, you must call three |
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|
111 |
methods in the correct order: |
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|
112 |
|
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113 |
#. :meth:`setfmt` to set the output format |
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|
114 |
|
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#. :meth:`channels` to set the number of channels |
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|
116 |
|
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#. :meth:`speed` to set the sample rate |
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|
118 |
|
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119 |
Alternately, you can use the :meth:`setparameters` method to set all three audio |
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120 |
parameters at once. This is more convenient, but may not be as flexible in all |
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121 |
cases. |
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122 |
|
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123 |
The audio device objects returned by :func:`open` define the following methods |
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and (read-only) attributes: |
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125 |
|
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126 |
|
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.. method:: oss_audio_device.close() |
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128 |
|
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Explicitly close the audio device. When you are done writing to or reading from |
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an audio device, you should explicitly close it. A closed device cannot be used |
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131 |
again. |
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132 |
|
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133 |
|
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.. method:: oss_audio_device.fileno() |
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|
135 |
|
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Return the file descriptor associated with the device. |
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137 |
|
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138 |
|
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.. method:: oss_audio_device.read(size) |
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140 |
|
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Read *size* bytes from the audio input and return them as a Python string. |
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142 |
Unlike most Unix device drivers, OSS audio devices in blocking mode (the |
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143 |
default) will block :func:`read` until the entire requested amount of data is |
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144 |
available. |
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145 |
|
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146 |
|
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.. method:: oss_audio_device.write(data) |
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148 |
|
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Write the Python string *data* to the audio device and return the number of |
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150 |
bytes written. If the audio device is in blocking mode (the default), the |
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151 |
entire string is always written (again, this is different from usual Unix device |
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152 |
semantics). If the device is in non-blocking mode, some data may not be written |
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---see :meth:`writeall`. |
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|
154 |
|
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155 |
|
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156 |
.. method:: oss_audio_device.writeall(data) |
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157 |
|
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Write the entire Python string *data* to the audio device: waits until the audio |
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159 |
device is able to accept data, writes as much data as it will accept, and |
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repeats until *data* has been completely written. If the device is in blocking |
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mode (the default), this has the same effect as :meth:`write`; :meth:`writeall` |
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162 |
is only useful in non-blocking mode. Has no return value, since the amount of |
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data written is always equal to the amount of data supplied. |
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164 |
|
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The following methods each map to exactly one :func:`ioctl` system call. The |
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correspondence is obvious: for example, :meth:`setfmt` corresponds to the |
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``SNDCTL_DSP_SETFMT`` ioctl, and :meth:`sync` to ``SNDCTL_DSP_SYNC`` (this can |
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|
168 |
be useful when consulting the OSS documentation). If the underlying |
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:func:`ioctl` fails, they all raise :exc:`IOError`. |
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170 |
|
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171 |
|
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.. method:: oss_audio_device.nonblock() |
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173 |
|
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174 |
Put the device into non-blocking mode. Once in non-blocking mode, there is no |
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way to return it to blocking mode. |
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176 |
|
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177 |
|
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178 |
.. method:: oss_audio_device.getfmts() |
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179 |
|
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Return a bitmask of the audio output formats supported by the soundcard. Some |
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181 |
of the formats supported by OSS are: |
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182 |
|
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183 |
+-------------------------+---------------------------------------------+ |
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184 |
| Format | Description | |
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185 |
+=========================+=============================================+ |
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186 |
| :const:`AFMT_MU_LAW` | a logarithmic encoding (used by Sun ``.au`` | |
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187 |
| | files and :file:`/dev/audio`) | |
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188 |
+-------------------------+---------------------------------------------+ |
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189 |
| :const:`AFMT_A_LAW` | a logarithmic encoding | |
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190 |
+-------------------------+---------------------------------------------+ |
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| :const:`AFMT_IMA_ADPCM` | a 4:1 compressed format defined by the | |
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192 |
| | Interactive Multimedia Association | |
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193 |
+-------------------------+---------------------------------------------+ |
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| :const:`AFMT_U8` | Unsigned, 8-bit audio | |
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195 |
+-------------------------+---------------------------------------------+ |
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| :const:`AFMT_S16_LE` | Signed, 16-bit audio, little-endian byte | |
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| | order (as used by Intel processors) | |
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198 |
+-------------------------+---------------------------------------------+ |
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199 |
| :const:`AFMT_S16_BE` | Signed, 16-bit audio, big-endian byte order | |
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200 |
| | (as used by 68k, PowerPC, Sparc) | |
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201 |
+-------------------------+---------------------------------------------+ |
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| :const:`AFMT_S8` | Signed, 8 bit audio | |
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203 |
+-------------------------+---------------------------------------------+ |
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204 |
| :const:`AFMT_U16_LE` | Unsigned, 16-bit little-endian audio | |
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205 |
+-------------------------+---------------------------------------------+ |
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206 |
| :const:`AFMT_U16_BE` | Unsigned, 16-bit big-endian audio | |
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207 |
+-------------------------+---------------------------------------------+ |
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208 |
|
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209 |
Consult the OSS documentation for a full list of audio formats, and note that |
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most devices support only a subset of these formats. Some older devices only |
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support :const:`AFMT_U8`; the most common format used today is |
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:const:`AFMT_S16_LE`. |
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|
213 |
|
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|
214 |
|
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.. method:: oss_audio_device.setfmt(format) |
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|
216 |
|
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|
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Try to set the current audio format to *format*---see :meth:`getfmts` for a |
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|
218 |
list. Returns the audio format that the device was set to, which may not be the |
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|
219 |
requested format. May also be used to return the current audio format---do this |
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|
220 |
by passing an "audio format" of :const:`AFMT_QUERY`. |
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|
221 |
|
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|
222 |
|
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223 |
.. method:: oss_audio_device.channels(nchannels) |
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|
224 |
|
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|
225 |
Set the number of output channels to *nchannels*. A value of 1 indicates |
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|
226 |
monophonic sound, 2 stereophonic. Some devices may have more than 2 channels, |
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227 |
and some high-end devices may not support mono. Returns the number of channels |
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228 |
the device was set to. |
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|
229 |
|
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|
230 |
|
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|
231 |
.. method:: oss_audio_device.speed(samplerate) |
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|
232 |
|
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233 |
Try to set the audio sampling rate to *samplerate* samples per second. Returns |
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|
234 |
the rate actually set. Most sound devices don't support arbitrary sampling |
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|
235 |
rates. Common rates are: |
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|
236 |
|
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237 |
+-------+-------------------------------------------+ |
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238 |
| Rate | Description | |
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239 |
+=======+===========================================+ |
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240 |
| 8000 | default rate for :file:`/dev/audio` | |
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241 |
+-------+-------------------------------------------+ |
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242 |
| 11025 | speech recording | |
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|
243 |
+-------+-------------------------------------------+ |
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244 |
| 22050 | | |
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245 |
+-------+-------------------------------------------+ |
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246 |
| 44100 | CD quality audio (at 16 bits/sample and 2 | |
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247 |
| | channels) | |
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248 |
+-------+-------------------------------------------+ |
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249 |
| 96000 | DVD quality audio (at 24 bits/sample) | |
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|
250 |
+-------+-------------------------------------------+ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
251 |
|
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|
252 |
|
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|
253 |
.. method:: oss_audio_device.sync() |
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|
254 |
|
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|
255 |
Wait until the sound device has played every byte in its buffer. (This happens |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
256 |
implicitly when the device is closed.) The OSS documentation recommends closing |
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|
257 |
and re-opening the device rather than using :meth:`sync`. |
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|
258 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
259 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
260 |
.. method:: oss_audio_device.reset() |
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|
261 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
262 |
Immediately stop playing or recording and return the device to a state where it |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
263 |
can accept commands. The OSS documentation recommends closing and re-opening |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
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|
264 |
the device after calling :meth:`reset`. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
265 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
266 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
267 |
.. method:: oss_audio_device.post() |
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|
268 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
269 |
Tell the driver that there is likely to be a pause in the output, making it |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
270 |
possible for the device to handle the pause more intelligently. You might use |
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|
271 |
this after playing a spot sound effect, before waiting for user input, or before |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
272 |
doing disk I/O. |
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|
273 |
|
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|
274 |
The following convenience methods combine several ioctls, or one ioctl and some |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
275 |
simple calculations. |
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|
276 |
|
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|
277 |
|
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|
278 |
.. method:: oss_audio_device.setparameters(format, nchannels, samplerate [, strict=False]) |
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|
279 |
|
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|
280 |
Set the key audio sampling parameters---sample format, number of channels, and |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
281 |
sampling rate---in one method call. *format*, *nchannels*, and *samplerate* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
282 |
should be as specified in the :meth:`setfmt`, :meth:`channels`, and |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
283 |
:meth:`speed` methods. If *strict* is true, :meth:`setparameters` checks to |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
284 |
see if each parameter was actually set to the requested value, and raises |
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|
285 |
:exc:`OSSAudioError` if not. Returns a tuple (*format*, *nchannels*, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
286 |
*samplerate*) indicating the parameter values that were actually set by the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
287 |
device driver (i.e., the same as the return values of :meth:`setfmt`, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
288 |
:meth:`channels`, and :meth:`speed`). |
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|
289 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
290 |
For example, :: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
291 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
292 |
(fmt, channels, rate) = dsp.setparameters(fmt, channels, rate) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
293 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
294 |
is equivalent to :: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
295 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
296 |
fmt = dsp.setfmt(fmt) |
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|
297 |
channels = dsp.channels(channels) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
298 |
rate = dsp.rate(channels) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
299 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
300 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
301 |
.. method:: oss_audio_device.bufsize() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
302 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
303 |
Returns the size of the hardware buffer, in samples. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
304 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
305 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
306 |
.. method:: oss_audio_device.obufcount() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
307 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
308 |
Returns the number of samples that are in the hardware buffer yet to be played. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
309 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
310 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
311 |
.. method:: oss_audio_device.obuffree() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
312 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
313 |
Returns the number of samples that could be queued into the hardware buffer to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
314 |
be played without blocking. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
315 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
316 |
Audio device objects also support several read-only attributes: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
317 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
318 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
319 |
.. attribute:: oss_audio_device.closed |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
320 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
|
321 |
Boolean indicating whether the device has been closed. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
322 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
323 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
324 |
.. attribute:: oss_audio_device.name |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
325 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
326 |
String containing the name of the device file. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
327 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
328 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
329 |
.. attribute:: oss_audio_device.mode |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
330 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
331 |
The I/O mode for the file, either ``"r"``, ``"rw"``, or ``"w"``. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
332 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
333 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
334 |
.. _mixer-device-objects: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
335 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
336 |
Mixer Device Objects |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
337 |
-------------------- |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
338 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
339 |
The mixer object provides two file-like methods: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
340 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
341 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
342 |
.. method:: oss_mixer_device.close() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
343 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
344 |
This method closes the open mixer device file. Any further attempts to use the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
345 |
mixer after this file is closed will raise an :exc:`IOError`. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
346 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
347 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
348 |
.. method:: oss_mixer_device.fileno() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
349 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
350 |
Returns the file handle number of the open mixer device file. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
351 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
352 |
The remaining methods are specific to audio mixing: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
353 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
354 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
355 |
.. method:: oss_mixer_device.controls() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
356 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
357 |
This method returns a bitmask specifying the available mixer controls ("Control" |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
358 |
being a specific mixable "channel", such as :const:`SOUND_MIXER_PCM` or |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
359 |
:const:`SOUND_MIXER_SYNTH`). This bitmask indicates a subset of all available |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
360 |
mixer controls---the :const:`SOUND_MIXER_\*` constants defined at module level. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
361 |
To determine if, for example, the current mixer object supports a PCM mixer, use |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
362 |
the following Python code:: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
363 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
364 |
mixer=ossaudiodev.openmixer() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
365 |
if mixer.controls() & (1 << ossaudiodev.SOUND_MIXER_PCM): |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
366 |
# PCM is supported |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
367 |
... code ... |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
368 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
369 |
For most purposes, the :const:`SOUND_MIXER_VOLUME` (master volume) and |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
370 |
:const:`SOUND_MIXER_PCM` controls should suffice---but code that uses the mixer |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
371 |
should be flexible when it comes to choosing mixer controls. On the Gravis |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
372 |
Ultrasound, for example, :const:`SOUND_MIXER_VOLUME` does not exist. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
373 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
374 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
375 |
.. method:: oss_mixer_device.stereocontrols() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
376 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
377 |
Returns a bitmask indicating stereo mixer controls. If a bit is set, the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
378 |
corresponding control is stereo; if it is unset, the control is either |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
379 |
monophonic or not supported by the mixer (use in combination with |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
380 |
:meth:`controls` to determine which). |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
381 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
382 |
See the code example for the :meth:`controls` function for an example of getting |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
383 |
data from a bitmask. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
384 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
385 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
386 |
.. method:: oss_mixer_device.reccontrols() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
387 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
388 |
Returns a bitmask specifying the mixer controls that may be used to record. See |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
389 |
the code example for :meth:`controls` for an example of reading from a bitmask. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
390 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
391 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
392 |
.. method:: oss_mixer_device.get(control) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
393 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
394 |
Returns the volume of a given mixer control. The returned volume is a 2-tuple |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
395 |
``(left_volume,right_volume)``. Volumes are specified as numbers from 0 |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
396 |
(silent) to 100 (full volume). If the control is monophonic, a 2-tuple is still |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
397 |
returned, but both volumes are the same. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
398 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
399 |
Raises :exc:`OSSAudioError` if an invalid control was is specified, or |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
400 |
:exc:`IOError` if an unsupported control is specified. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
401 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
402 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
403 |
.. method:: oss_mixer_device.set(control, (left, right)) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
404 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
405 |
Sets the volume for a given mixer control to ``(left,right)``. ``left`` and |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
406 |
``right`` must be ints and between 0 (silent) and 100 (full volume). On |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
407 |
success, the new volume is returned as a 2-tuple. Note that this may not be |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
408 |
exactly the same as the volume specified, because of the limited resolution of |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
409 |
some soundcard's mixers. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
410 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
411 |
Raises :exc:`OSSAudioError` if an invalid mixer control was specified, or if the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
412 |
specified volumes were out-of-range. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
413 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
414 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
415 |
.. method:: oss_mixer_device.get_recsrc() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
416 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
417 |
This method returns a bitmask indicating which control(s) are currently being |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
418 |
used as a recording source. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
419 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
420 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
421 |
.. method:: oss_mixer_device.set_recsrc(bitmask) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
422 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
423 |
Call this function to specify a recording source. Returns a bitmask indicating |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
424 |
the new recording source (or sources) if successful; raises :exc:`IOError` if an |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
425 |
invalid source was specified. To set the current recording source to the |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
426 |
microphone input:: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
427 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
428 |
mixer.setrecsrc (1 << ossaudiodev.SOUND_MIXER_MIC) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
429 |