Refactoring: use normal (previous frame is first) overlap buffer layout

1 files changed, 52 insertions, 0 deletions

diff --git a/src/delay_buffer.h b/src/delay_buffer.h
new file mode 100644
index 0000000..9e0cfb1
--- /dev/null
+++ b/src/delay_buffer.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of AtracDEnc.
+ *
+ * AtracDEnc is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * AtracDEnc is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+#include <cstring>
+
+namespace NAtracDEnc {
+
+template<class T, int N, int S>
+class TDelayBuffer {
+public:
+    TDelayBuffer() {
+        static_assert(std::is_pod<T>::value, "T must be a POD type.");
+        memset(Buffer_, 0, sizeof(T) * N * S * 2);
+    }
+
+    void Shift(bool erace = true) {
+        for (int i = 0; i < N; i++) {
+            memcpy(&Buffer_[i][0], &Buffer_[i][S], sizeof(T) * S);
+            if (erace)
+                memset(&Buffer_[i][S], 0, sizeof(T) * S);
+        }
+    }
+
+    T* GetFirst(int i) {
+        return &Buffer_[i][0];
+    }
+
+    T* GetSecond(int i) {
+        return &Buffer_[i][S];
+    }
+
+private:
+    T Buffer_[N][S*2];    
+};
+
+} // namespace NAtracDEnc