• Takashi Sakamoto's avatar
    ALSA: pcm: add comment about application of rule to PCM parameters · d81052f9
    Takashi Sakamoto authored
    Drivers add rules of parameters to runtime of PCM substream, when
    applications open ALSA PCM character device. When applications call
    ioctl(2) with SNDRV_PCM_IOCTL_HW_REFINE or SNDRV_PCM_IOCTL_HW_PARAMS, the
    rules are applied to the parameters and return the result to user space.
    
    The rule can have dependency between parameters. Additionally, it can have
    condition flags about application of rules. Userspace applications can
    indicate the flags to suppress change of parameters.
    
    This commit attempts to describe the mechanism.
    Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    d81052f9
pcm_native.c 103 KB