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doc/components.txt: record/play infrastructure

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Norman Feske 2024-02-27 16:05:26 +01:00
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1 changed files with 11 additions and 10 deletions
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doc/components.txt
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@ -34,10 +34,11 @@ of them is briefly characterized as follows:
the driver is made available to other system components via
one of Genode's device-independent session interfaces, which are
'platform_session', 'capture_session', 'event_session', 'block_session',
'audio_out_session', 'log_session', 'nic_session', and 'timer_session'
(see _os/include/_ for the interface definitions). Those interfaces are
uniform across hardware platforms and kernel base platforms. Usually,
each device driver can accommodate only one client at a time.
'record_session', 'play_session', 'log_session', 'uplink_session', and
'timer_session' (see _os/include/_ for the interface definitions).
Those interfaces are uniform across hardware platforms and kernel base
platforms. Usually, each device driver accommodates one client at a
time.
:Resource multiplexers: provide mechanisms to multiplex device resources
to multiple clients. A typical resource multiplexer requests one
@ -194,9 +195,9 @@ provided by the kernel, or a pseudo time source (busy):
Audio drivers
=============
Audio drivers implement the Audio_out session interface defined at
_os/include/audio_out_session/_ for playback and optionally the audio_in
interface for recording.
Audio drivers use the audio mixer's record session interface defined at
_os/include/record_session/_ for audio output and optionally the play
session interface _os/include/play_session/_ for audio input.
:_os/src/drivers/audio/spec/linux/_:
Uses ALSA as back-end on the Linux base platform and supports only playback.
@ -277,9 +278,9 @@ subdirectory of a source repository.
framebuffer and a virtual input interface. Nitpicker (including a README
file) is located at _os/src/server/nitpicker/_.
:Audio output: The audio mixer located at _os/src/server/mixer/_ enables
multiple clients to use the audio-out interface. The mixing is done by simply
adding and clamping the signals of all present clients.
:Audio output: The audio mixer located at _os/src/server/record_play_mixer/_
allows for the routing and mixing of audio signals from play-session clients
to record-session clients.
:Networking: The NIC bridge located at _os/src/server/nic_bridge/_ multiplexes
one NIC session to multiple virtual NIC sessions using a proxy-ARP