1 files changed, 129 insertions, 0 deletions
diff --git a/audio/Acx/Samples/AudioCodec/Driver/Driver.cpp b/audio/Acx/Samples/AudioCodec/Driver/Driver.cpp
new file mode 100644
index 00000000..452b0d99
--- /dev/null
+++ b/audio/Acx/Samples/AudioCodec/Driver/Driver.cpp
@@ -0,0 +1,129 @@
+/*++
+
+Copyright (c) Microsoft Corporation.  All rights reserved.
+
+Module Name:
+
+    Driver.cpp
+
+Abstract:
+
+    This file contains the driver entry points and callbacks.
+
+Environment:
+
+    Kernel-mode Driver Framework
+
+--*/
+
+#include "public.h"
+#include "cpp_utils.h"
+
+#ifndef __INTELLISENSE__
+#include "driver.tmh"
+#endif
+
+_Use_decl_annotations_
+void AudioCodecDriverUnload(
+    _In_ WDFDRIVER Driver
+)
+{
+    PAGED_CODE();
+
+    if (!Driver)
+    {
+        ASSERT(FALSE);
+        return;
+    }
+
+    WPP_CLEANUP(WdfDriverWdmGetDriverObject(Driver));
+
+    if (g_RegistryPath.Buffer != nullptr)
+    {
+        ExFreePool(g_RegistryPath.Buffer);
+        RtlZeroMemory(&g_RegistryPath, sizeof(g_RegistryPath));
+    }
+
+    return;
+}
+
+INIT_CODE_SEG
+NTSTATUS
+DriverEntry(
+    _In_ PDRIVER_OBJECT  DriverObject,
+    _In_ PUNICODE_STRING RegistryPath
+)
+/*++
+
+Routine Description:
+    DriverEntry initializes the driver and is the first routine called by the
+    system after the driver is loaded. DriverEntry specifies the other entry
+    points in the function driver, such as EvtDevice and DriverUnload.
+
+Parameters Description:
+
+    DriverObject - represents the instance of the function driver that is loaded
+    into memory. DriverEntry must initialize members of DriverObject before it
+    returns to the caller. DriverObject is allocated by the system before the
+    driver is loaded, and it is released by the system after the system unloads
+    the function driver from memory.
+
+    RegistryPath - represents the driver specific path in the Registry.
+    The function driver can use the path to store driver related data between
+    reboots. The path does not store hardware instance specific data.
+
+Return Value:
+
+    STATUS_SUCCESS if successful,
+    STATUS_UNSUCCESSFUL otherwise.
+
+--*/
+{
+    WDF_DRIVER_CONFIG           wdfCfg;
+    ACX_DRIVER_CONFIG           acxCfg;
+    WDFDRIVER                   driver;
+    NTSTATUS                    status = STATUS_SUCCESS;
+    WDF_OBJECT_ATTRIBUTES       attributes;
+
+    PAGED_CODE();
+    WPP_INIT_TRACING(DriverObject, RegistryPath);
+
+    auto exit = scope_exit([&status, &DriverObject]() {
+        if (!NT_SUCCESS(status))
+        {
+            WPP_CLEANUP(DriverObject);
+
+            if (g_RegistryPath.Buffer != nullptr)
+            {
+                ExFreePool(g_RegistryPath.Buffer);
+                RtlZeroMemory(&g_RegistryPath, sizeof(g_RegistryPath));
+            }
+        }
+        });
+
+    RETURN_NTSTATUS_IF_FAILED(CopyRegistrySettingsPath(RegistryPath));
+
+    WDF_OBJECT_ATTRIBUTES_INIT(&attributes);
+
+    WDF_DRIVER_CONFIG_INIT(&wdfCfg, Codec_EvtBusDeviceAdd);
+    wdfCfg.EvtDriverUnload = AudioCodecDriverUnload;
+
+    //
+    // Create a framework driver object to represent our driver.
+    //
+    RETURN_NTSTATUS_IF_FAILED(WdfDriverCreate(DriverObject, RegistryPath, &attributes, &wdfCfg, &driver));
+
+    //
+    // Initializing the ACX driver configuration struct which contains size and flags
+    // elements. 
+    //
+    ACX_DRIVER_CONFIG_INIT(&acxCfg);
+
+    // 
+    // The driver calls this DDI in its DriverEntry callback after creating the WDF driver
+    // object. ACX uses this call to apply any post driver settings.
+    //
+    RETURN_NTSTATUS_IF_FAILED(AcxDriverInitialize(driver, &acxCfg));
+
+    return status;
+}