[alsa-devel] [RFC] compress: add support for gapless playback
pierre-louis.bossart at linux.intel.com
Wed Feb 6 14:59:56 CET 2013
>>>> + if (!stream->ops->set_metadata)
>>>> + return -ENXIO;
>>> Is this really a fatal error? Or do we want to mandate that gapless
>>> be supported by all implementations?
>> Fatal err? if DSP doesnt support metadata callback then we are reporting error
>> ENXIO to userpsace. No we shouldnt mandate, its upto DSP folks to see what they
>> should and can support.
> Well, up to userspace to see how it handles the error anyway. For
> example an application may want to fall back to PCM playback with
> gapless done on the CPU if the driver doesn't do it. But then given
> that there's more than one piece of metadata in the struct perhaps we
> need some way for the application to figure out what's supported?
Maybe we should expose what's supported as part of the decoder query
process, i.e. expose support for metadata as part of the decoder
capabilities rather than as part of the set_metadata part? Error checks
after inits are painful. we could have a "metadata_support" bit-field
that the application could check.
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