[PATCH 1/3] mmdevapi: Return stub interface from ASM_GetSessionEnumerator().

[Paul Gofman]

From: Paul Gofman

---
 dlls/mmdevapi/audiosessionmanager.c | 101 +++++++++++++++++++++++++++-
 1 file changed, 99 insertions(+), 2 deletions(-)

diff --git a/dlls/mmdevapi/audiosessionmanager.c b/dlls/mmdevapi/audiosessionmanager.c
index 5486b3fa40c..99aa6ac4959 100644
--- a/dlls/mmdevapi/audiosessionmanager.c
+++ b/dlls/mmdevapi/audiosessionmanager.c
@@ -48,6 +48,101 @@ void sessions_unlock(void)
     LeaveCriticalSection(&g_sessions_lock);
 }

+struct session_enum
+{
+    IAudioSessionEnumerator IAudioSessionEnumerator_iface;
+    LONG ref;
+};
+
+static struct session_enum *impl_from_IAudioSessionEnumerator(IAudioSessionEnumerator *iface)
+{
+    return CONTAINING_RECORD(iface, struct session_enum, IAudioSessionEnumerator_iface);
+}
+
+static HRESULT WINAPI enumerator_QueryInterface(IAudioSessionEnumerator *iface, REFIID riid, void **ppv)
+{
+    struct session_enum *enumerator = impl_from_IAudioSessionEnumerator(iface);
+
+    TRACE("(%p)->(%s, %p)\n", enumerator, debugstr_guid(riid), ppv);
+
+    if (!ppv)
+        return E_POINTER;
+
+    if (IsEqualIID(riid, &IID_IUnknown) ||
+        IsEqualIID(riid, &IID_IAudioSessionEnumerator))
+        *ppv = &enumerator->IAudioSessionEnumerator_iface;
+    else {
+        WARN("Unknown iface %s.\n", debugstr_guid(riid));
+        *ppv = NULL;
+        return E_NOINTERFACE;
+    }
+
+    IUnknown_AddRef((IUnknown *)*ppv);
+
+    return S_OK;
+}
+
+static ULONG WINAPI enumerator_AddRef(IAudioSessionEnumerator *iface)
+{
+    struct session_enum *enumerator = impl_from_IAudioSessionEnumerator(iface);
+    ULONG ref = InterlockedIncrement(&enumerator->ref);
+    TRACE("(%p) new ref %lu\n", enumerator, ref);
+    return ref;
+}
+
+static ULONG WINAPI enumerator_Release(IAudioSessionEnumerator *iface)
+{
+    struct session_enum *enumerator = impl_from_IAudioSessionEnumerator(iface);
+    ULONG ref = InterlockedDecrement(&enumerator->ref);
+    TRACE("(%p) new ref %lu\n", enumerator, ref);
+
+    if (!ref)
+        free(enumerator);
+
+    return ref;
+}
+
+static HRESULT WINAPI enumerator_GetCount(IAudioSessionEnumerator *iface, int *count)
+{
+    FIXME("%p -> %p stub.\n", iface, count);
+
+    if (!count) return E_POINTER;
+
+    *count = 0;
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI enumerator_GetSession(IAudioSessionEnumerator *iface, int index, IAudioSessionControl **session)
+{
+    FIXME("%p -> %d %p stub.\n", iface, index, session);
+
+    if (!session) return E_POINTER;
+    *session = NULL;
+    return E_NOTIMPL;
+}
+
+static const IAudioSessionEnumeratorVtbl IAudioSessionEnumerator_vtbl =
+{
+    enumerator_QueryInterface,
+    enumerator_AddRef,
+    enumerator_Release,
+    enumerator_GetCount,
+    enumerator_GetSession,
+};
+
+static HRESULT create_session_enumerator(IAudioSessionEnumerator **ppv)
+{
+    struct session_enum *enumerator;
+
+    if (!(enumerator = calloc(1, sizeof(*enumerator))))
+        return E_OUTOFMEMORY;
+
+    enumerator->IAudioSessionEnumerator_iface.lpVtbl = &IAudioSessionEnumerator_vtbl;
+    enumerator->ref = 1;
+    *ppv = &enumerator->IAudioSessionEnumerator_iface;
+    return S_OK;
+}
+
 static inline struct session_mgr *impl_from_IAudioSessionManager2(IAudioSessionManager2 *iface)
 {
     return CONTAINING_RECORD(iface, struct session_mgr, IAudioSessionManager2_iface);
@@ -137,8 +232,10 @@ static HRESULT WINAPI ASM_GetSessionEnumerator(IAudioSessionManager2 *iface,
                                                IAudioSessionEnumerator **out)
 {
     struct session_mgr *This = impl_from_IAudioSessionManager2(iface);
-    FIXME("(%p)->(%p) - stub\n", This, out);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%p).\n", This, out);
+
+    return create_session_enumerator(out);
 }

static HRESULT WINAPI ASM_RegisterSessionNotification(IAudioSessionManager2 *iface,