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// Copyright (c) 2012 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 CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
#define CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
#include <list>
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "content/browser/speech/audio_buffer.h"
namespace content{
class AudioChunk;
// Provides a simple interface to encode raw audio using the various speech
// codecs.
class AudioEncoder {
public:
enum Codec {
CODEC_FLAC,
CODEC_SPEEX,
};
static AudioEncoder* Create(Codec codec,
int sampling_rate,
int bits_per_sample);
virtual ~AudioEncoder();
// Encodes |raw audio| to the internal buffer. Use
// |GetEncodedDataAndClear| to read the result after this call or when
// audio capture completes.
virtual void Encode(const AudioChunk& raw_audio) = 0;
// Finish encoding and flush any pending encoded bits out.
virtual void Flush() = 0;
// Merges, retrieves and clears all the accumulated encoded audio chunks.
scoped_refptr<AudioChunk> GetEncodedDataAndClear();
const std::string& mime_type() { return mime_type_; }
int bits_per_sample() { return bits_per_sample_; }
protected:
AudioEncoder(const std::string& mime_type, int bits_per_sample);
AudioBuffer encoded_audio_buffer_;
private:
std::string mime_type_;
int bits_per_sample_;
DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
};
} // namespace content
#endif // CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
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