[libvirt] [PATCH v6 03/14] audio: -audiodev command line option: documentation
Kővágó, Zoltán
dirty.ice.hu at gmail.com
Fri Mar 8 22:34:14 UTC 2019
This patch adds documentation of an -audiodev command line option, that
deprecates the old QEMU_* environment variables for audio backend
configuration. It's syntax is similar to existing options (-netdev,
-device, etc):
-audiodev driver_name,property=value,...
Although now it's possible to specify multiple -audiodev options on
command line, multiple audio backends are not supported yet.
Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu at gmail.com>
---
Notes:
Changes from v4:
* deprecated QEMU_AUDIO_ env vars
* updated to reflect qapi changes
* added info to qemu-deprecated.texi
qemu-deprecated.texi | 7 ++
qemu-options.hx | 236 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 240 insertions(+), 3 deletions(-)
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 45c57952da..5c07ad4acb 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -60,6 +60,13 @@ Support for invalid topologies will be removed, the user must ensure
topologies described with -smp include all possible cpus, i.e.
@math{@var{sockets} * @var{cores} * @var{threads} = @var{maxcpus}}.
+ at subsection QEMU_AUDIO_ environment variables and -audio-help (since 4.0)
+
+The ``-audiodev'' argument is now the preferred way to specify audio
+backend settings instead of environment variables. To ease migration to
+the new format, the ``-audiodev-help'' option can be used to convert
+the current values of the environment variables to ``-audiodev'' options.
+
@section QEMU Machine Protocol (QMP) commands
@subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
diff --git a/qemu-options.hx b/qemu-options.hx
index 1cf9aac1fe..52ea13e6a2 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -416,14 +416,244 @@ The default is @code{en-us}.
ETEXI
+HXCOMM Deprecated by -audiodev
DEF("audio-help", 0, QEMU_OPTION_audio_help,
- "-audio-help print list of audio drivers and their options\n",
+ "-audio-help show -audiodev equivalent of the currently specified audio settings\n",
QEMU_ARCH_ALL)
STEXI
@item -audio-help
@findex -audio-help
-Will show the audio subsystem help: list of drivers, tunable
-parameters.
+Will show the -audiodev equivalent of the currently specified
+(deprecated) environment variables.
+ETEXI
+
+DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
+ "-audiodev [driver=]driver,id=id[,prop[=value][,...]]\n"
+ " specifies the audio backend to use\n"
+ " id= identifier of the backend\n"
+ " timer-period= timer period in microseconds\n"
+ " in|out.fixed-settings= use fixed settings for host audio\n"
+ " in|out.frequency= frequency to use with fixed settings\n"
+ " in|out.channels= number of channels to use with fixed settings\n"
+ " in|out.format= sample format to use with fixed settings\n"
+ " valid values: s8, s16, s32, u8, u16, u32\n"
+ " in|out.voices= number of voices to use\n"
+ " in|out.buffer-len= length of buffer in microseconds\n"
+ "-audiodev none,id=id,[,prop[=value][,...]]\n"
+ " dummy driver that discards all output\n"
+#ifdef CONFIG_AUDIO_ALSA
+ "-audiodev alsa,id=id[,prop[=value][,...]]\n"
+ " in|out.dev= name of the audio device to use\n"
+ " in|out.period-len= length of period in microseconds\n"
+ " in|out.try-poll= attempt to use poll mode\n"
+ " threshold= threshold (in microseconds) when playback starts\n"
+#endif
+#ifdef CONFIG_AUDIO_COREAUDIO
+ "-audiodev coreaudio,id=id[,prop[=value][,...]]\n"
+ " in|out.buffer-count= number of buffers\n"
+#endif
+#ifdef CONFIG_AUDIO_DSOUND
+ "-audiodev dsound,id=id[,prop[=value][,...]]\n"
+ " latency= add extra latency to playback in microseconds\n"
+#endif
+#ifdef CONFIG_AUDIO_OSS
+ "-audiodev oss,id=id[,prop[=value][,...]]\n"
+ " in|out.dev= path of the audio device to use\n"
+ " in|out.buffer-count= number of buffers\n"
+ " in|out.try-poll= attempt to use poll mode\n"
+ " try-mmap= try using memory mapped access\n"
+ " exclusive= open device in exclusive mode\n"
+ " dsp-policy= set timing policy (0..10), -1 to use fragment mode\n"
+#endif
+#ifdef CONFIG_AUDIO_PA
+ "-audiodev pa,id=id[,prop[=value][,...]]\n"
+ " server= PulseAudio server address\n"
+ " in|out.name= source/sink device name\n"
+#endif
+#ifdef CONFIG_AUDIO_SDL
+ "-audiodev sdl,id=id[,prop[=value][,...]]\n"
+#endif
+#ifdef CONFIG_SPICE
+ "-audiodev spice,id=id[,prop[=value][,...]]\n"
+#endif
+ "-audiodev wav,id=id[,prop[=value][,...]]\n"
+ " path= path of wav file to record\n",
+ QEMU_ARCH_ALL)
+STEXI
+ at item -audiodev [driver=]@var{driver},id=@var{id}[, at var{prop}[=@var{value}][,...]]
+ at findex -audiodev
+Adds a new audio backend @var{driver} identified by @var{id}. There are
+global and driver specific properties. Some values can be set
+differently for input and output, they're marked with @code{in|out.}.
+You can set the input's property with @code{in. at var{prop}} and the
+output's property with @code{out. at var{prop}}. For example:
+ at example
+-audiodev alsa,id=example,in.frequency=44110,out.frequency=8000
+-audiodev alsa,id=example,out.channels=1 # leaves in.channels unspecified
+ at end example
+
+Valid global options are:
+
+ at table @option
+ at item id=@var{identifier}
+Identifies the audio backend.
+
+ at item timer-period=@var{period}
+Sets the timer @var{period} used by the audio subsystem in microseconds.
+Default is 10000 (10 ms).
+
+ at item in|out.fixed-settings=on|off
+Use fixed settings for host audio. When off, it will change based on
+how the guest opens the sound card. In this case you must not specify
+ at var{frequency}, @var{channels} or @var{format}. Default is on.
+
+ at item in|out.frequency=@var{frequency}
+Specify the @var{frequency} to use when using @var{fixed-settings}.
+Default is 44100Hz.
+
+ at item in|out.channels=@var{channels}
+Specify the number of @var{channels} to use when using
+ at var{fixed-settings}. Default is 2 (stereo).
+
+ at item in|out.format=@var{format}
+Specify the sample @var{format} to use when using @var{fixed-settings}.
+Valid values are: @code{s8}, @code{s16}, @code{s32}, @code{u8},
+ at code{u16}, @code{u32}. Default is @code{s16}.
+
+ at item in|out.voices=@var{voices}
+Specify the number of @var{voices} to use. Default is 1.
+
+ at item in|out.buffer=@var{usecs}
+Sets the size of the buffer in microseconds.
+
+ at end table
+
+ at item -audiodev none,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a dummy backend that discards all outputs. This backend has no
+backend specific properties.
+
+ at item -audiodev alsa,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates backend using the ALSA. This backend is only available on
+Linux.
+
+ALSA specific options are:
+
+ at table @option
+
+ at item in|out.dev=@var{device}
+Specify the ALSA @var{device} to use for input and/or output. Default
+is @code{default}.
+
+ at item in|out.period-len=@var{usecs}
+Sets the period length in microseconds.
+
+ at item in|out.try-poll=on|off
+Attempt to use poll mode with the device. Default is on.
+
+ at item threshold=@var{threshold}
+Threshold (in microseconds) when playback starts. Default is 0.
+
+ at end table
+
+ at item -audiodev coreaudio,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend using Apple's Core Audio. This backend is only
+available on Mac OS and only supports playback.
+
+Core Audio specific options are:
+
+ at table @option
+
+ at item in|out.buffer-count=@var{count}
+Sets the @var{count} of the buffers.
+
+ at end table
+
+ at item -audiodev dsound,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend using Microsoft's DirectSound. This backend is only
+available on Windows and only supports playback.
+
+DirectSound specific options are:
+
+ at table @option
+
+ at item latency=@var{usecs}
+Add extra @var{usecs} microseconds latency to playback. Default is
+10000 (10 ms).
+
+ at end table
+
+ at item -audiodev oss,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend using OSS. This backend is available on most
+Unix-like systems.
+
+OSS specific options are:
+
+ at table @option
+
+ at item in|out.dev=@var{device}
+Specify the file name of the OSS @var{device} to use. Default is
+ at code{/dev/dsp}.
+
+ at item in|out.buffer-count=@var{count}
+Sets the @var{count} of the buffers.
+
+ at item in|out.try-poll=on|of
+Attempt to use poll mode with the device. Default is on.
+
+ at item try-mmap=on|off
+Try using memory mapped device access. Default is off.
+
+ at item exclusive=on|off
+Open the device in exclusive mode (vmix won't work in this case).
+Default is off.
+
+ at item dsp-policy=@var{policy}
+Sets the timing policy (between 0 and 10, where smaller number means
+smaller latency but higher CPU usage). Use -1 to use buffer sizes
+specified by @code{buffer} and @code{buffer-count}. This option is
+ignored if you do not have OSS 4. Default is 5.
+
+ at end table
+
+ at item -audiodev pa,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend using PulseAudio. This backend is available on most
+systems.
+
+PulseAudio specific options are:
+
+ at table @option
+
+ at item server=@var{server}
+Sets the PulseAudio @var{server} to connect to.
+
+ at item in|out.name=@var{sink}
+Use the specified source/sink for recording/playback.
+
+ at end table
+
+ at item -audiodev sdl,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend using SDL. This backend is available on most systems,
+but you should use your platform's native backend if possible. This
+backend has no backend specific properties.
+
+ at item -audiodev spice,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend that sends audio through SPICE. This backend requires
+ at code{-spice} and automatically selected in that case, so usually you
+can ignore this option. This backend has no backend specific
+properties.
+
+ at item -audiodev wav,id=@var{id}[, at var{prop}[=@var{value}][,...]]
+Creates a backend that writes audio to a WAV file.
+
+Backend specific options are:
+
+ at table @option
+
+ at item path=@var{path}
+Write recorded audio into the specified file. Default is
+ at code{qemu.wav}.
+
+ at end table
ETEXI
DEF("soundhw", HAS_ARG, QEMU_OPTION_soundhw,
--
2.20.1
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