1 files changed, 60 insertions, 0 deletions
diff --git a/src/common_audio/vad/main/source/vad_sp.h b/src/common_audio/vad/main/source/vad_sp.h
new file mode 100644
index 0000000000..ae15c11ad6
--- /dev/null
+++ b/src/common_audio/vad/main/source/vad_sp.h
@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2011 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.
+ */
+
+
+/*
+ * This header file includes the VAD internal calls for Downsampling and FindMinimum.
+ * Specific function calls are given below.
+ */
+
+#ifndef WEBRTC_VAD_SP_H_
+#define WEBRTC_VAD_SP_H_
+
+#include "vad_core.h"
+
+/****************************************************************************
+ * WebRtcVad_Downsampling(...)
+ *
+ * Downsamples the signal a factor 2, eg. 32->16 or 16->8
+ *
+ * Input:
+ *      - signal_in     : Input signal
+ *      - in_length     : Length of input signal in samples
+ *
+ * Input & Output:
+ *      - filter_state  : Filter state for first all-pass filters
+ *
+ * Output:
+ *      - signal_out    : Downsampled signal (of length len/2)
+ */
+void WebRtcVad_Downsampling(WebRtc_Word16* signal_in,
+                            WebRtc_Word16* signal_out,
+                            WebRtc_Word32* filter_state,
+                            int in_length);
+
+/****************************************************************************
+ * WebRtcVad_FindMinimum(...)
+ *
+ * Find the five lowest values of x in 100 frames long window. Return a mean
+ * value of these five values.
+ *
+ * Input:
+ *      - feature_value : Feature value
+ *      - channel       : Channel number
+ *
+ * Input & Output:
+ *      - inst          : State information
+ *
+ * Output:
+ *      return value    : Weighted minimum value for a moving window.
+ */
+WebRtc_Word16 WebRtcVad_FindMinimum(VadInstT* inst, WebRtc_Word16 feature_value, int channel);
+
+#endif // WEBRTC_VAD_SP_H_