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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_SPLICER_H_
#define MEDIA_BASE_AUDIO_SPLICER_H_
#include <deque>
#include "base/memory/ref_counted.h"
#include "media/base/audio_timestamp_helper.h"
#include "media/base/media_export.h"
namespace media {
class AudioDecoderConfig;
class DataBuffer;
// Helper class that handles filling gaps and resolving overlaps.
class MEDIA_EXPORT AudioSplicer {
public:
AudioSplicer(int bytes_per_frame, int samples_per_second);
~AudioSplicer();
// Resets the splicer state by clearing the output buffers queue,
// and resetting the timestamp helper.
void Reset();
// Adds a new buffer full of samples or end of stream buffer to the splicer.
// Returns true if the buffer was accepted. False is returned if an error
// occurred.
bool AddInput(const scoped_refptr<DataBuffer>& input);
// Returns true if the splicer has a buffer to return.
bool HasNextBuffer() const;
// Removes the next buffer from the output buffer queue and returns it.
// This should only be called if HasNextBuffer() returns true.
scoped_refptr<DataBuffer> GetNextBuffer();
private:
void AddOutputBuffer(const scoped_refptr<DataBuffer>& buffer);
AudioTimestampHelper output_timestamp_helper_;
// Minimum gap size needed before the splicer will take action to
// fill a gap. This avoids periodically inserting and then dropping samples
// when the buffer timestamps are slightly off because of timestamp rounding
// in the source content.
int min_gap_size_;
std::deque<scoped_refptr<DataBuffer> > output_buffers_;
bool received_end_of_stream_;
DISALLOW_IMPLICIT_CONSTRUCTORS(AudioSplicer);
};
} // namespace media
#endif
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