[alsa-devel] [PATCH 3/3] pulse: Add fallback option

[Raymond Yau]

2011/7/26 Takashi Iwai <tiwai at suse.de>:
> [Patch to alsa-plugins]
>
> Added "fallback" option to give the PCM / controller name as a fallback
> when connecting to PA server fails.
>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
>  doc/README-pulse  |   19 +++++++++++++++++++
>  pulse/ctl_pulse.c |   17 ++++++++++++++++-
>  pulse/pcm_pulse.c |   17 ++++++++++++++++-
>  pulse/pulse.c     |    7 ++++---
>  pulse/pulse.h     |    2 +-
>  5 files changed, 56 insertions(+), 6 deletions(-)
>
> diff --git a/doc/README-pulse b/doc/README-pulse
> index d5431b4..5b119f9 100644
> --- a/doc/README-pulse
> +++ b/doc/README-pulse
> @@ -39,3 +39,22 @@ you need to do this with PCM:s then specify two PCM:s with different "device".
>
>  If you do not specify any source and/or sink, then the server's defaults will
>  be used.
> +
> +When "fallback" option is set, the plugin will try to open the given PCM
> +(or control) automatically when connecting to PA server fails.  Typically,
> +it should point to "sysdefault", which was introduced recently in alsa-lib,
> +so that the system-default setup is used even when you overwrite "default"
> +PCM and control definitions.
> +
> +    pcm.pulse {
> +        type pulse
> +        fallback "sysdefault"
> +    }
> +
> +    ctl.pulse {
> +        type pulse
> +        fallback "sysdefault"
> +    }
> +
> +   pcm.!default "pulse"
> +   ctl.!default "pulse"

it seem that override "pulse" is not a good idea

a better way is just add "fallback" to default

pcm.!default {
    type pulse
    fallback "sysdefault"
    hint {
        description "Default"
    }
}

ctl.!default {
    type pulse
    fallback "sysdefault"
    hint {
        description "Default"
    }
}