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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_MODEM_IMPL_H_
#define COMPONENTS_AUDIO_MODEM_MODEM_IMPL_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/cancelable_callback.h"
#include "base/containers/mru_cache.h"
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "components/audio_modem/public/audio_modem_types.h"
#include "components/audio_modem/public/modem.h"
#include "media/base/audio_bus.h"
namespace base {
class Time;
}
namespace audio_modem {
class AudioPlayer;
class AudioRecorder;
class WhispernetClient;
// The ModemImpl class manages the playback and recording of tokens.
// Clients should not necessary expect the modem to play or record continuously.
// In the future, it may timeslice multiple tokens, or implement carrier sense.
class ModemImpl final : public Modem {
public:
ModemImpl();
~ModemImpl() override;
// Modem overrides:
void Initialize(WhispernetClient* client,
const TokensCallback& tokens_cb) override;
void StartPlaying(AudioType type) override;
void StopPlaying(AudioType type) override;
void StartRecording(AudioType type) override;
void StopRecording(AudioType type) override;
void SetToken(AudioType type, const std::string& url_safe_token) override;
const std::string GetToken(AudioType type) const override;
bool IsPlayingTokenHeard(AudioType type) const override;
void SetTokenParams(AudioType type, const TokenParameters& params) override;
void set_player_for_testing(AudioType type, AudioPlayer* player) {
player_[type] = player;
}
void set_recorder_for_testing(AudioRecorder* recorder) {
recorder_ = recorder;
}
private:
using SamplesMap = base::MRUCache<std::string,
scoped_refptr<media::AudioBusRefCounted>>;
// Receives the audio samples from encoding a token.
void OnTokenEncoded(AudioType type,
const std::string& token,
const scoped_refptr<media::AudioBusRefCounted>& samples);
// Receives any tokens found by decoding audio samples.
void OnTokensFound(const std::vector<AudioToken>& tokens);
// Update our currently playing token with the new token. Change the playing
// samples if needed. Prerequisite: Samples corresponding to this token
// should already be in the samples cache.
void UpdateToken(AudioType type, const std::string& token);
void RestartPlaying(AudioType type);
void DecodeSamplesConnector(const std::string& samples);
void DumpToken(AudioType audio_type,
const std::string& token,
const media::AudioBus* samples);
WhispernetClient* client_;
// Callbacks to send tokens back to the client.
TokensCallback tokens_cb_;
// This cancelable callback is passed to the recorder. The recorder's
// destruction will happen on the audio thread, so it can outlive us.
base::CancelableCallback<void(const std::string&)> decode_cancelable_cb_;
// We use the AudioType enum to index into all our data structures that work
// on values for both audible and inaudible.
static_assert(AUDIBLE == 0, "AudioType::AUDIBLE should be 0.");
static_assert(INAUDIBLE == 1, "AudioType::INAUDIBLE should be 1.");
// Indexed using enum AudioType.
bool player_enabled_[2];
bool should_be_playing_[2];
bool should_be_recording_[2];
// AudioPlayer and AudioRecorder objects are self-deleting. When we call
// Finalize on them, they clean themselves up on the Audio thread.
// Indexed using enum AudioType.
AudioPlayer* player_[2];
AudioRecorder* recorder_;
// Indexed using enum AudioType.
std::string playing_token_[2];
TokenParameters token_params_[2];
base::Time started_playing_[2];
base::Time heard_own_token_[2];
// Cache that holds the encoded samples. After reaching its limit, the cache
// expires the oldest samples first.
// Indexed using enum AudioType.
ScopedVector<SamplesMap> samples_caches_;
base::FilePath dump_tokens_dir_;
DISALLOW_COPY_AND_ASSIGN(ModemImpl);
};
} // namespace audio_modem
#endif // COMPONENTS_AUDIO_MODEM_MODEM_IMPL_H_
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