SNDRV_PCM_IOCTL_WRITEI_FRAMES 600 include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_WRITEI_FRAMES _IOW('A', 0x50, struct snd_xferi) SNDRV_PCM_IOCTL_WRITEI_FRAMES 600 tools/include/uapi/sound/asound.h #define SNDRV_PCM_IOCTL_WRITEI_FRAMES _IOW('A', 0x50, struct snd_xferi)