diff options
Diffstat (limited to 'sys/dev/sound/usb/uaudio.c')
| -rw-r--r-- | sys/dev/sound/usb/uaudio.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/dev/sound/usb/uaudio.c b/sys/dev/sound/usb/uaudio.c index 5de4038d297e5..37be3c7444019 100644 --- a/sys/dev/sound/usb/uaudio.c +++ b/sys/dev/sound/usb/uaudio.c @@ -100,7 +100,7 @@ static int uaudio_default_channels = 0; /* use default */ static int uaudio_buffer_ms = 8; #ifdef USB_DEBUG -static int uaudio_debug = 0; +static int uaudio_debug; static SYSCTL_NODE(_hw_usb, OID_AUTO, uaudio, CTLFLAG_RW, 0, "USB uaudio"); @@ -136,6 +136,8 @@ uaudio_buffer_ms_sysctl(SYSCTL_HANDLER_ARGS) SYSCTL_PROC(_hw_usb_uaudio, OID_AUTO, buffer_ms, CTLTYPE_INT | CTLFLAG_RWTUN, 0, sizeof(int), uaudio_buffer_ms_sysctl, "I", "uaudio buffering delay from 2ms to 8ms"); +#else +#define uaudio_debug 0 #endif #define UAUDIO_NFRAMES 64 /* must be factor of 8 due HS-USB */ @@ -2161,6 +2163,14 @@ uaudio_chan_play_sync_callback(struct usb_xfer *xfer, usb_error_t error) break; case USB_ST_SETUP: + /* + * Check if the recording stream can be used as a + * source of jitter information to save some + * isochronous bandwidth: + */ + if (ch->priv_sc->sc_rec_chan.num_alt != 0 && + uaudio_debug == 0) + break; usbd_xfer_set_frames(xfer, 1); usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_framelen(xfer)); usbd_transfer_submit(xfer); |