From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Mon, 5 Oct 2015 20:48:24 +0000 (+0200)
Subject: Document alternates 3 and 4.
X-Git-Tag: 0.4~60
X-Git-Url: https://git.sesse.net/?p=bmusb;a=commitdiff_plain;h=64568304a31f00588d7cd69d6edfb574a5fe3ad8

Document alternates 3 and 4.
---

diff --git a/bmusb.cpp b/bmusb.cpp
index a176f93..16da5f0 100644
--- a/bmusb.cpp
+++ b/bmusb.cpp
@@ -682,6 +682,9 @@ void BMUSBCapture::configure_card()
 	// Alternate setting 1 is output, alternate setting 2 is input.
 	// Card is reset when switching alternates, so the driver uses
 	// this “double switch” when it wants to reset.
+	//
+	// There's also alternate settings 3 and 4, which seem to be
+	// like 1 and 2 except they advertise less bandwidth needed.
 	rc = libusb_set_interface_alt_setting(devh, /*interface=*/0, /*alternate_setting=*/1);
 	if (rc < 0) {
 		fprintf(stderr, "Error setting alternate 1: %s\n", libusb_error_name(rc));