add vad code.

VocieProcess/modules/audio_processing/aec_dump/aec_dump_factory.h

@@ -0,0 +1,48 @@
+/*
+ *  Copyright (c) 2017 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 MODULES_AUDIO_PROCESSING_AEC_DUMP_AEC_DUMP_FACTORY_H_
+#define MODULES_AUDIO_PROCESSING_AEC_DUMP_AEC_DUMP_FACTORY_H_
+
+#include <memory>
+
+#include "absl/base/nullability.h"
+#include "absl/strings/string_view.h"
+#include "api/task_queue/task_queue_base.h"
+#include "modules/audio_processing/include/aec_dump.h"
+#include "rtc_base/system/file_wrapper.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+class RTC_EXPORT AecDumpFactory {
+ public:
+  // The `worker_queue` must outlive the created AecDump instance.
+  // `max_log_size_bytes == -1` means the log size will be unlimited.
+  // The AecDump takes responsibility for `handle` and closes it in the
+  // destructor. A non-null return value indicates that the file has been
+  // sucessfully opened.
+  static absl::Nullable<std::unique_ptr<AecDump>> Create(
+      FileWrapper file,
+      int64_t max_log_size_bytes,
+      absl::Nonnull<TaskQueueBase*> worker_queue);
+  static absl::Nullable<std::unique_ptr<AecDump>> Create(
+      absl::string_view file_name,
+      int64_t max_log_size_bytes,
+      absl::Nonnull<TaskQueueBase*> worker_queue);
+  static absl::Nullable<std::unique_ptr<AecDump>> Create(
+      absl::Nonnull<FILE*> handle,
+      int64_t max_log_size_bytes,
+      absl::Nonnull<TaskQueueBase*> worker_queue);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC_DUMP_AEC_DUMP_FACTORY_H_