• Takashi Sakamoto's avatar
    ALSA: firewire-motu: add MIDI functionality · 9e796e7d
    Takashi Sakamoto authored
    In MOTU FireWire series, MIDI messages are multiplexed to isochronous
    packets as well as PCM frames, while the way is different from the one
    in IEC 61883-6.
    
    MIDI messages are put into a certain position in message chunks. One data
    block can includes one byte of the MIDI messages. When data block includes
    a MIDI byte, the block has a flag in a certain position of the message
    chunk. These positions are unique depending on protocols.
    
    Once a data block includes a MIDI byte, some following data blocks includes
    no MIDI bytes. Next MIDI byte appears on a data block corresponding to
    next cycle of physical MIDI bus. This seems to avoid buffer overflow caused
    by bandwidth differences between IEEE 1394 bus and physical MIDI bus.
    
    This commit adds MIDI functionality to transfer/receive MIDI messages.
    Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    9e796e7d
Makefile 176 Bytes