However, the kernelspace drivers only implement PCM streaming and MIDI streaming, whereas device control is meant to be provided by userspace applications like ffado-mixer. While the FFADO drivers can only be used in conjunction with JACK, the kernelspace drivers can be used with any ALSA compatible application. This change cannot have negative impact on any standard protocols, but developers of private protocols may need to adapt if they relied on these root directory entries instead of their own unit directory entries.
This change makes firewire-cores local Configuration ROM comply with IEEEs OUI assignment rules. These devices spread the PCM and MIDI channels across 2 tx 2 rx IEEE 1394 channels instead of just 1 tx 1 rx IEEE 1394 channel, as most other devices do.ĭata block processing is split from isochronous packet processing. It required a startup delay of the outbound stream, which caused DICE II based devices to remain silent at the first attempt to start streaming. This synchronization happened when the device was configured for internal clock. It ensures that the bus and device firmware settle into a ready state before userspace initiate IO to the device.
This was already implemented for snd-dice in Linux v4.5 and is now adopted by the other FireWire audio drivers. This simplifies the kernel code and allows for finer-grained tasklet scheduling.
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