From f6b78c32dc9eddf17473d899afedfce320703608 Mon Sep 17 00:00:00 2001
From: hselasky <hselasky@FreeBSD.org>
Date: Mon, 28 Feb 2011 17:23:15 +0000
Subject: - Add support for software pre-scaling of ISOCHRONOUS transfers.

MFC after:	14 days
Approved by:	thompsa (mentor)
---
 lib/libusb/libusb20.3 | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib/libusb/libusb20.3')

diff --git a/lib/libusb/libusb20.3 b/lib/libusb/libusb20.3
index a6dc890..93dfe18 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 .
 .
+If
+.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.
-- 
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