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audio/pwaudio.c: Add Pipewire audio backend for QEMU

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This commit adds a new audiodev backend to allow QEMU to use Pipewire as
both an audio sink and source. This backend is available on most systems

Add Pipewire entry points for QEMU Pipewire audio backend
Add wrappers for QEMU Pipewire audio backend in qpw_pcm_ops()
qpw_write function returns the current state of the stream to pwaudio
and Writes some data to the server for playback streams using pipewire
spa_ringbuffer implementation.
qpw_read function returns the current state of the stream to pwaudio and
reads some data from the server for capture streams using pipewire
spa_ringbuffer implementation. These functions qpw_write and qpw_read
are called during playback and capture.
Added some functions that convert pw audio formats to QEMU audio format
and vice versa which would be needed in the pipewire audio sink and
source functions qpw_init_in() & qpw_init_out().
These methods that implement playback and recording will create streams
for playback and capture that will start processing and will result in
the on_process callbacks to be called.
Built a connection to the Pipewire sound system server in the
qpw_audio_init() method.

Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Reviewed-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20230417105654.32328-1-dbassey@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Dorinda Bassey 2023-04-17 12:56:54 +02:00 • committed by Marc-André Lureau
parent f6b761bdbd
commit c2d3d1c294
10 changed files with 1013 additions and 3 deletions
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21
qemu-options.hx
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@ -793,6 +793,12 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
" in|out.name= source/sink device name\n"
" in|out.latency= desired latency in microseconds\n"
#endif
#ifdef CONFIG_AUDIO_PIPEWIRE
"-audiodev pipewire,id=id[,prop[=value][,...]]\n"
" in|out.name= source/sink device name\n"
" in|out.stream-name= name of pipewire stream\n"
" in|out.latency= desired latency in microseconds\n"
#endif
#ifdef CONFIG_AUDIO_SDL
"-audiodev sdl,id=id[,prop[=value][,...]]\n"
" in|out.buffer-count= number of buffers\n"
@ -956,6 +962,21 @@ SRST
Desired latency in microseconds. The PulseAudio server will try
to honor this value but actual latencies may be lower or higher.
``-audiodev pipewire,id=id[,prop[=value][,...]]``
Creates a backend using Pipewire. This backend is available on
most systems.
Pipewire specific options are:
``in|out.latency=usecs``
Desired latency in microseconds.
``in|out.name=sink``
Use the specified source/sink for recording/playback.
``in|out.stream-name``
Specify the name of pipewire stream.
``-audiodev sdl,id=id[,prop[=value][,...]]``
Creates a backend using SDL. This backend is available on most
systems, but you should use your platform's native backend if