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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 MEDIA_BASE_AUDIO_DECODER_H_
#define MEDIA_BASE_AUDIO_DECODER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "media/base/channel_layout.h"
#include "media/base/pipeline_status.h"
#include "media/base/media_export.h"
namespace media {
class DataBuffer;
class DemuxerStream;
class MEDIA_EXPORT AudioDecoder
: public base::RefCountedThreadSafe<AudioDecoder> {
public:
// Status codes for read operations.
enum Status {
kOk,
kAborted,
kDecodeError,
};
// Initialize an AudioDecoder with the given DemuxerStream, executing the
// callback upon completion.
// statistics_cb is used to update global pipeline statistics.
virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
const PipelineStatusCB& status_cb,
const StatisticsCB& statistics_cb) = 0;
// Request samples to be decoded and returned via the provided callback.
// Only one read may be in flight at any given time.
//
// Implementations guarantee that the callback will not be called from within
// this method.
//
// Non-NULL sample buffer pointers will contain decoded audio data or may
// indicate the end of the stream. A NULL buffer pointer indicates an aborted
// Read(). This can happen if the DemuxerStream gets flushed and doesn't have
// any more data to return.
typedef base::Callback<void(Status, const scoped_refptr<DataBuffer>&)> ReadCB;
virtual void Read(const ReadCB& read_cb) = 0;
// Reset decoder state, dropping any queued encoded data.
virtual void Reset(const base::Closure& closure) = 0;
// Returns various information about the decoded audio format.
virtual int bits_per_channel() = 0;
virtual ChannelLayout channel_layout() = 0;
virtual int samples_per_second() = 0;
protected:
friend class base::RefCountedThreadSafe<AudioDecoder>;
virtual ~AudioDecoder();
AudioDecoder();
DISALLOW_COPY_AND_ASSIGN(AudioDecoder);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_DECODER_H_
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