From 6eda8a85b84c4e661a8763429ae1978f8da7f9dd Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 5 May 2019 12:34:01 +0200
Subject: video/ps3eye: WIP

---
 video-ps3eye/PS3EYEDriver/singleton.cpp | 107 ++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 video-ps3eye/PS3EYEDriver/singleton.cpp

(limited to 'video-ps3eye/PS3EYEDriver/singleton.cpp')

diff --git a/video-ps3eye/PS3EYEDriver/singleton.cpp b/video-ps3eye/PS3EYEDriver/singleton.cpp
new file mode 100644
index 00000000..93017fc5
--- /dev/null
+++ b/video-ps3eye/PS3EYEDriver/singleton.cpp
@@ -0,0 +1,107 @@
+#include "singleton.hpp"
+#include "internal.hpp"
+#include "ps3eye.hpp"
+
+//#define USE_CONTEXT
+
+USBMgr::USBMgr()
+{
+#ifdef USE_CONTEXT
+    libusb_init(&usb_context);
+#else
+    libusb_init(nullptr);
+#endif
+    libusb_set_debug(usb_context, 3);
+}
+
+USBMgr::~USBMgr()
+{
+#ifdef USE_CONTEXT
+    stop_xfer_thread();
+    libusb_exit(usb_context);
+#endif
+}
+
+USBMgr& USBMgr::instance()
+{
+    static USBMgr ret;
+    return ret;
+}
+
+void USBMgr::camera_started()
+{
+    if (++active_camera_count == 1)
+        start_xfer_thread();
+}
+
+void USBMgr::camera_stopped()
+{
+    if (--active_camera_count == 0)
+        stop_xfer_thread();
+}
+
+void USBMgr::start_xfer_thread()
+{
+    update_thread = std::thread(&USBMgr::transfer_loop, this);
+}
+
+void USBMgr::stop_xfer_thread()
+{
+    exit_signaled = true;
+    update_thread.join();
+    // Reset the exit signal flag.
+    // If we don't and we call start_xfer_thread() again, transfer_loop will exit immediately.
+    exit_signaled = false;
+}
+
+void USBMgr::transfer_loop()
+{
+    struct timeval tv {
+        0,
+        50 * 1000, // ms
+    };
+
+    debug2("-> xfer loop");
+
+    while (!exit_signaled.load(std::memory_order_relaxed))
+    {
+        int status = libusb_handle_events_timeout_completed(usb_context, &tv, nullptr);
+
+        if (status != LIBUSB_SUCCESS && status != LIBUSB_ERROR_INTERRUPTED)
+            debug("libusb error(%d) %s\n", status, libusb_strerror((enum libusb_error)status));
+    }
+    debug2("<- xfer loop\n");
+}
+
+int USBMgr::list_devices(std::vector<ps3eye_camera::device>& list)
+{
+    libusb_device **devs;
+    libusb_device_handle *devhandle;
+    int cnt = (int)libusb_get_device_list(usb_context, &devs);
+
+    if (cnt < 0)
+        debug("device scan failed\n");
+
+    cnt = 0;
+    for (int i = 0; devs[i]; i++)
+    {
+        libusb_device* dev = devs[i];
+        struct libusb_device_descriptor desc;
+
+        if (libusb_get_device_descriptor(dev, &desc))
+            continue;
+        if (desc.idVendor == ps3eye_camera::VENDOR_ID && desc.idProduct == ps3eye_camera::PRODUCT_ID)
+        {
+            if (libusb_open(dev, &devhandle))
+                continue;
+            libusb_ref_device(dev);
+            libusb_close(devhandle);
+            list.emplace_back(std::make_shared<ps3eye_camera>(dev));
+            cnt++;
+        }
+    }
+
+    libusb_free_device_list(devs, 1);
+
+    return cnt;
+}
-- 
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