Support hotplugging existing devices.

[bmusb] / bmusb.cpp

diff --git a/bmusb.cpp b/bmusb.cpp
index ec3eac2918313e36258649357f7f27385f42a111..09473fd9f6ca4f839435bedbc1e2838cd100b35e 100644 (file)
--- a/bmusb.cpp
+++ b/bmusb.cpp
@@ -51,6 +51,7 @@ using namespace std::placeholders;
 namespace bmusb {
 
 card_connected_callback_t BMUSBCapture::card_connected_callback = nullptr;
+bool BMUSBCapture::hotplug_existing_devices = false;
 
 namespace {
 
@@ -1346,7 +1347,7 @@ void BMUSBCapture::start_bm_thread()
        // coming back with errors, so only care about devices joining.
        if (card_connected_callback != nullptr) {
                if (libusb_hotplug_register_callback(
-                       nullptr, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, LIBUSB_HOTPLUG_NO_FLAGS,
+                       nullptr, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED, hotplug_existing_devices ? LIBUSB_HOTPLUG_ENUMERATE : LIBUSB_HOTPLUG_NO_FLAGS,
                        USB_VENDOR_BLACKMAGIC, LIBUSB_HOTPLUG_MATCH_ANY, LIBUSB_HOTPLUG_MATCH_ANY,
                        &BMUSBCapture::cb_hotplug, nullptr, nullptr) < 0) {
                        fprintf(stderr, "libusb_hotplug_register_callback() failed\n");