audout: FlushAudioOutBuffers

Fixes Devil May Cry

src/audio_core/stream.cpp

@@ -51,6 +51,14 @@ void Stream::Stop() {
     UNIMPLEMENTED();
 }
 
+bool Stream::Flush() {
+    const bool had_buffers = !queued_buffers.empty();
+    while (!queued_buffers.empty()) {
+        queued_buffers.pop();
+    }
+    return had_buffers;
+}
+
 void Stream::SetVolume(float volume) {
     game_volume = volume;
 }

src/audio_core/stream.h

@@ -56,6 +56,9 @@ public:
     /// Queues a buffer into the audio stream, returns true on success
     bool QueueBuffer(BufferPtr&& buffer);
 
+    /// Flush audio buffers
+    bool Flush();
+
     /// Returns true if the audio stream contains a buffer with the specified tag
     [[nodiscard]] bool ContainsBuffer(Buffer::Tag tag) const;