Creating the audio_modem component

components/audio_modem/public/audio_modem_types.h

Index: components/audio_modem/public/audio_modem_types.h
diff --git a/components/audio_modem/public/audio_modem_types.h b/components/audio_modem/public/audio_modem_types.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_AUDIO_MODEM_PUBLIC_AUDIO_MODEM_TYPES_H_
+#define COMPONENTS_AUDIO_MODEM_PUBLIC_AUDIO_MODEM_TYPES_H_
+
+#include <string>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/channel_layout.h"
+
+// Various constants and types used for the audio modem.
+// TODO(ckehoe): Move the constants out into their own header.
+
+namespace audio_modem {
+
+// Number of repetitions of the audio token in one sequence of samples.
+extern const int kDefaultRepetitions;
+
+// Whispernet encoding parameters. These need to be the same on all platforms.
+extern const float kDefaultSampleRate;
+extern const int kDefaultBitsPerSample;
+extern const float kDefaultCarrierFrequency;
+
+// The next two really need to be configurable since they don't need to be
+// consistent across platforms, or even playing/recording.
+extern const int kDefaultChannels;
+extern const media::ChannelLayout kDefaultChannelLayout;
+
+// Enum to represent the audio band (audible vs. ultrasound).
+// AUDIBLE and INAUDIBLE are used as array indices.
+enum AudioType {
+  AUDIBLE = 0,
+  INAUDIBLE = 1,
+  BOTH = 2,
+  AUDIO_TYPE_UNKNOWN = 3,
+};
+
+// Struct representing an audio token.
+// TODO(ckehoe): Make this use the AudioType enum instead of a boolean.
+struct AudioToken final {
+  AudioToken(const std::string& token, bool audible)
+      : token(token),
+        audible(audible) {}
+
+  std::string token;
+  bool audible;
+};
+
+// Callback to pass around found tokens.
+using TokensCallback = base::Callback<void(const std::vector<AudioToken>&)>;
+
+}  // namespace audio_modem
+
+#endif  // COMPONENTS_AUDIO_MODEM_PUBLIC_AUDIO_MODEM_TYPES_H_