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// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_SPEECH_AUDIO_ENCODER_FLAC_H_
#define COBALT_SPEECH_AUDIO_ENCODER_FLAC_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/threading/thread_checker.h"
#include "cobalt/media/base/audio_bus.h"
#include "third_party/flac/include/FLAC/stream_encoder.h"
namespace cobalt {
namespace speech {
// Encode raw audio to using FLAC codec.
class AudioEncoderFlac {
public:
typedef media::AudioBus AudioBus;
explicit AudioEncoderFlac(int sample_rate);
~AudioEncoderFlac();
// Encode raw audio data.
void Encode(const AudioBus* audio_bus);
// Finish encoding.
void Finish();
// Returns mime Type of audio data.
std::string GetMimeType() const;
// Returns and clears the available encoded audio data.
std::string GetAndClearAvailableEncodedData();
private:
// FLAC encoder callback.
static FLAC__StreamEncoderWriteStatus WriteCallback(
const FLAC__StreamEncoder* encoder, const FLAC__byte buffer[],
size_t bytes, unsigned int samples, unsigned int current_frame,
void* client_data);
THREAD_CHECKER(thread_checker_);
// FLAC encoder.
FLAC__StreamEncoder* encoder_;
// Cached encoded data.
std::string encoded_data_;
};
} // namespace speech
} // namespace cobalt
#endif // COBALT_SPEECH_AUDIO_ENCODER_FLAC_H_