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[PATCH v7 12/12] docs/system: add basic virtio-snd documentation
From: |
Emmanouil Pitsidianakis |
Subject: |
[PATCH v7 12/12] docs/system: add basic virtio-snd documentation |
Date: |
Tue, 22 Aug 2023 22:18:35 +0300 |
This commit adds basic documentation for using virtio-snd.
Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
docs/system/device-emulation.rst | 1 +
docs/system/devices/virtio-snd.rst | 49 ++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
create mode 100644 docs/system/devices/virtio-snd.rst
diff --git a/docs/system/device-emulation.rst b/docs/system/device-emulation.rst
index 4491c4cbf7..dae19446e5 100644
--- a/docs/system/device-emulation.rst
+++ b/docs/system/device-emulation.rst
@@ -92,6 +92,7 @@ Emulated Devices
devices/usb.rst
devices/vhost-user.rst
devices/virtio-pmem.rst
+ devices/virtio-snd.rst
devices/vhost-user-rng.rst
devices/canokey.rst
devices/usb-u2f.rst
diff --git a/docs/system/devices/virtio-snd.rst
b/docs/system/devices/virtio-snd.rst
new file mode 100644
index 0000000000..2a9187fd70
--- /dev/null
+++ b/docs/system/devices/virtio-snd.rst
@@ -0,0 +1,49 @@
+virtio sound
+============
+
+This document explains the setup and usage of the Virtio sound device.
+The Virtio sound device is a paravirtualized sound card device.
+
+Linux kernel support
+--------------------
+
+Virtio sound requires a guest Linux kernel built with the
+``CONFIG_SND_VIRTIO`` option.
+
+Description
+-----------
+
+Virtio sound implements capture and playback from inside a guest using the
+configured audio backend of the host machine.
+
+Device properties
+-----------------
+
+The Virtio sound device can be configured with the following properties:
+
+ * ``jacks`` number of physical jacks (Unimplemented).
+ * ``streams`` number of PCM streams. At the moment, no stream configuration
is supported: the first one will always be a playback stream, an optional
second will always be a capture stream. Adding more will cycle stream
directions from playback to capture.
+ * ``chmaps`` number of channel maps (Unimplemented).
+
+All streams are stereo and have the default channel positions ``Front left,
right``.
+
+Examples
+--------
+
+Add an audio device and an audio backend at once with ``-audio`` and
``model=virtio``:
+
+ * pulseaudio: ``-audio driver=pa,model=virtio``
+ or ``-audio driver=pa,model=virtio,server=/run/user/1000/pulse/native``
+ * sdl: ``-audio driver=sdl,model=virtio``
+ * coreaudio: ``-audio driver=coreaudio,model=virtio``
+
+etc.
+
+To specifically add virtualized sound devices, you have to specify a PCI device
+and an audio backend listed with ``-audio driver=help`` that works on your host
+machine, e.g.:
+
+::
+
+ -device virtio-sound-pci,audiodev=my_audiodev \
+ -audiodev alsa,id=my_audiodev
--
2.39.2
- [PATCH v7 04/12] virtio-sound: set PCM stream parameters, (continued)
- [PATCH v7 04/12] virtio-sound: set PCM stream parameters, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 05/12] virtio-sound: handle VIRTIO_SND_R_PCM_INFO request, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 06/12] virtio-sound: handle VIRTIO_SND_R_PCM_{START,STOP}, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 07/12] virtio-sound: handle VIRTIO_SND_PCM_SET_PARAMS, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 08/12] virtio-sound: handle VIRTIO_SND_R_PCM_PREPARE, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 09/12] virtio-sound: handle VIRTIO_SND_PCM_RELEASE, Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 10/12] virtio-sound: implement audio output (TX), Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 11/12] virtio-sound: implement audio capture (RX), Emmanouil Pitsidianakis, 2023/08/22
- [PATCH v7 12/12] docs/system: add basic virtio-snd documentation,
Emmanouil Pitsidianakis <=
- Re: [PATCH v7 00/12] Add VIRTIO sound card, Alex Bennée, 2023/08/24