• Takashi Sakamoto's avatar
    ALSA: firewire-motu: add PCM functionality · dd49b2d1
    Takashi Sakamoto authored
    This commit adds PCM functionality to transmit/receive PCM samples.
    
    When one of PCM substreams are running or external clock source is
    selected, current sampling rate is used. Else, the sampling rate is
    changed according to requests from a userspace application.
    
    Available number of samples in a frame of PCM substream is determined at
    open(2) to corresponding PCM character device. Later, packet streaming
    starts by ioctl(2) with SNDRV_PCM_IOCTL_PREPARE. In theory, between them,
    applications can change state of the unit by any write transaction to
    change the number. In this case, this driver may fail packet streaming due
    to wrong data format.
    Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    dd49b2d1
motu.h 4.08 KB