path: root/lib/libusb/libusb20.3
diff options
Diffstat (limited to 'lib/libusb/libusb20.3')
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/libusb/libusb20.3 b/lib/libusb/libusb20.3
index a6dc890a70b4..93dfe18cf5be 100644
--- a/lib/libusb/libusb20.3
+++ b/lib/libusb/libusb20.3
@@ -261,6 +261,16 @@ The actual buffer size can be greater than
and is returned by
.Fn libusb20_tr_get_max_total_length .
+.Fa max_frame_count
+is OR'ed with LIBUSB20_MAX_FRAME_PRE_SCALE the remaining part of the
+argument is converted from milliseconds into the actual number of
+frames rounded up, when this function returns.
+This flag is only valid for ISOCHRONOUS transfers and has no effect
+for other transfer types.
+The actual number of frames setup is found by calling
+.Fn libusb20_tr_get_max_frames .
This function returns zero upon success.
Non-zero return values indicate a LIBUSB20_ERROR value.