Add fir_filter to common_audio
It has 3 implementation:
* fir_filter_c with no optimization
* fir_filter_sse which outperforms the C version by a factor of 3x
* fir_filter_neon which outperforms the C version by a factor of 2x
R=andrew@webrtc.org, bjornv@webrtc.org, johannkoenig@google.com
Review URL: https://webrtc-codereview.appspot.com/9759004
git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5756 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/common_audio/fir_filter_neon.h b/common_audio/fir_filter_neon.h
new file mode 100644
index 0000000..df41c92
--- /dev/null
+++ b/common_audio/fir_filter_neon.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_COMMON_AUDIO_FIR_FILTER_NEON_H_
+#define WEBRTC_COMMON_AUDIO_FIR_FILTER_NEON_H_
+
+#include "webrtc/common_audio/fir_filter.h"
+#include "webrtc/system_wrappers/interface/aligned_malloc.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+
+namespace webrtc {
+
+class FIRFilterNEON : public FIRFilter {
+ public:
+ FIRFilterNEON(const float* coefficients,
+ size_t coefficients_length,
+ size_t max_input_length);
+
+ virtual void Filter(const float* in, size_t length, float* out) OVERRIDE;
+
+ private:
+ size_t coefficients_length_;
+ size_t state_length_;
+ scoped_ptr<float[], AlignedFreeDeleter> coefficients_;
+ scoped_ptr<float[], AlignedFreeDeleter> state_;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_COMMON_AUDIO_FIR_FILTER_NEON_H_