1 files changed, 114 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/vad/webrtc_vad.c b/third_party/libwebrtc/common_audio/vad/webrtc_vad.c
new file mode 100644
index 0000000000..6dd14d8b55
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/webrtc_vad.c
@@ -0,0 +1,114 @@
+/*
+ *  Copyright (c) 2012 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.
+ */
+
+#include "common_audio/vad/include/webrtc_vad.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/vad/vad_core.h"
+
+static const int kInitCheck = 42;
+static const int kValidRates[] = { 8000, 16000, 32000, 48000 };
+static const size_t kRatesSize = sizeof(kValidRates) / sizeof(*kValidRates);
+static const int kMaxFrameLengthMs = 30;
+
+VadInst* WebRtcVad_Create(void) {
+  VadInstT* self = (VadInstT*)malloc(sizeof(VadInstT));
+
+  self->init_flag = 0;
+
+  return (VadInst*)self;
+}
+
+void WebRtcVad_Free(VadInst* handle) {
+  free(handle);
+}
+
+// TODO(bjornv): Move WebRtcVad_InitCore() code here.
+int WebRtcVad_Init(VadInst* handle) {
+  // Initialize the core VAD component.
+  return WebRtcVad_InitCore((VadInstT*) handle);
+}
+
+// TODO(bjornv): Move WebRtcVad_set_mode_core() code here.
+int WebRtcVad_set_mode(VadInst* handle, int mode) {
+  VadInstT* self = (VadInstT*) handle;
+
+  if (handle == NULL) {
+    return -1;
+  }
+  if (self->init_flag != kInitCheck) {
+    return -1;
+  }
+
+  return WebRtcVad_set_mode_core(self, mode);
+}
+
+int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
+                      size_t frame_length) {
+  int vad = -1;
+  VadInstT* self = (VadInstT*) handle;
+
+  if (handle == NULL) {
+    return -1;
+  }
+
+  if (self->init_flag != kInitCheck) {
+    return -1;
+  }
+  if (audio_frame == NULL) {
+    return -1;
+  }
+  if (WebRtcVad_ValidRateAndFrameLength(fs, frame_length) != 0) {
+    return -1;
+  }
+
+  if (fs == 48000) {
+      vad = WebRtcVad_CalcVad48khz(self, audio_frame, frame_length);
+  } else if (fs == 32000) {
+    vad = WebRtcVad_CalcVad32khz(self, audio_frame, frame_length);
+  } else if (fs == 16000) {
+    vad = WebRtcVad_CalcVad16khz(self, audio_frame, frame_length);
+  } else if (fs == 8000) {
+    vad = WebRtcVad_CalcVad8khz(self, audio_frame, frame_length);
+  }
+
+  if (vad > 0) {
+    vad = 1;
+  }
+  return vad;
+}
+
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length) {
+  int return_value = -1;
+  size_t i;
+  int valid_length_ms;
+  size_t valid_length;
+
+  // We only allow 10, 20 or 30 ms frames. Loop through valid frame rates and
+  // see if we have a matching pair.
+  for (i = 0; i < kRatesSize; i++) {
+    if (kValidRates[i] == rate) {
+      for (valid_length_ms = 10; valid_length_ms <= kMaxFrameLengthMs;
+          valid_length_ms += 10) {
+        valid_length = (size_t)(kValidRates[i] / 1000 * valid_length_ms);
+        if (frame_length == valid_length) {
+          return_value = 0;
+          break;
+        }
+      }
+      break;
+    }
+  }
+
+  return return_value;
+}