Re: [PATCH v4] audio/pwaudio.c: Add Pipewire audio backend for QEMU

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Friday, February 17, 2023 6:07:32 PM CET Dorinda Bassey wrote:
> 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>

Acked-by: Christian Schoenebeck <qemu_oss@crudebyte.com>

> ---
> fix typo
> raise version dependency
> 
>  audio/audio.c                 |   3 +
>  audio/audio_template.h        |   4 +
>  audio/meson.build             |   1 +
>  audio/pwaudio.c               | 827 ++++++++++++++++++++++++++++++++++
>  meson.build                   |   8 +
>  meson_options.txt             |   4 +-
>  qapi/audio.json               |  45 ++
>  qemu-options.hx               |  17 +
>  scripts/meson-buildoptions.sh |   8 +-
>  9 files changed, 914 insertions(+), 3 deletions(-)
>  create mode 100644 audio/pwaudio.c