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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
#define CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
#include <memory>
#include <string>
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "content/browser/speech/audio_buffer.h"
#include "third_party/flac/include/FLAC/stream_encoder.h"
namespace content{
class AudioChunk;
class FlacStreamEncoderDeleter {
public:
void operator()(FLAC__StreamEncoder* ptr) {
FLAC__stream_encoder_delete(ptr);
}
};
// Provides a simple interface to encode raw audio using FLAC codec.
class AudioEncoder {
public:
AudioEncoder(int sampling_rate, int bits_per_sample);
AudioEncoder(const AudioEncoder&) = delete;
AudioEncoder& operator=(const AudioEncoder&) = delete;
~AudioEncoder();
// Encodes |raw audio| to the internal buffer. Use
// |GetEncodedDataAndClear| to read the result after this call or when
// audio capture completes.
void Encode(const AudioChunk& raw_audio);
// Finish encoding and flush any pending encoded bits out.
void Flush();
// Merges, retrieves and clears all the accumulated encoded audio chunks.
scoped_refptr<AudioChunk> GetEncodedDataAndClear();
std::string GetMimeType();
int GetBitsPerSample();
private:
AudioBuffer encoded_audio_buffer_;
std::unique_ptr<FLAC__StreamEncoder, FlacStreamEncoderDeleter> encoder_;
bool is_encoder_initialized_;
};
} // namespace content
#endif // CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
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