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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 <string>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/channel_layout.h"
#include "media/base/decoder_buffer.h"
#include "media/base/media_export.h"
#include "media/base/pipeline_status.h"
namespace media {
class AudioBuffer;
class DemuxerStream;
class MEDIA_EXPORT AudioDecoder {
public:
// Status codes for decode operations.
// TODO(rileya): Now that both AudioDecoder and VideoDecoder Status enums
// match, break them into a decoder_status.h.
enum Status {
kOk, // We're all good.
kAborted, // We aborted as a result of Reset() or destruction.
kDecodeError // A decoding error occurred.
};
// Callback for VideoDecoder initialization.
typedef base::Callback<void(bool success)> InitCB;
// Callback for AudioDecoder to return a decoded frame whenever it becomes
// available. Only non-EOS frames should be returned via this callback.
typedef base::Callback<void(const scoped_refptr<AudioBuffer>&)> OutputCB;
// Callback for Decode(). Called after the decoder has completed decoding
// corresponding DecoderBuffer, indicating that it's ready to accept another
// buffer to decode.
typedef base::Callback<void(Status)> DecodeCB;
AudioDecoder();
// Fires any pending callbacks, stops and destroys the decoder.
// Note: Since this is a destructor, |this| will be destroyed after this call.
// Make sure the callbacks fired from this call doesn't post any task that
// depends on |this|.
virtual ~AudioDecoder();
// Returns the name of the decoder for logging purpose.
virtual std::string GetDisplayName() const = 0;
// Initializes an AudioDecoder with the given DemuxerStream, executing the
// callback upon completion.
// |init_cb| is used to return initialization status.
// |output_cb| is called for decoded audio buffers (see Decode()).
virtual void Initialize(const AudioDecoderConfig& config,
const InitCB& init_cb,
const OutputCB& output_cb) = 0;
// Requests samples to be decoded. Only one decode may be in flight at any
// given time. Once the buffer is decoded the decoder calls |decode_cb|.
// |output_cb| specified in Initialize() is called for each decoded buffer,
// before or after |decode_cb|.
//
// Implementations guarantee that the callbacks will not be called from within
// this method.
//
// If |buffer| is an EOS buffer then the decoder must be flushed, i.e.
// |output_cb| must be called for each frame pending in the queue and
// |decode_cb| must be called after that.
virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
const DecodeCB& decode_cb) = 0;
// Resets decoder state. All pending Decode() requests will be finished or
// aborted before |closure| is called.
virtual void Reset(const base::Closure& closure) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(AudioDecoder);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_DECODER_H_
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