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// Copyright 2013 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_AUDIO_SOUNDS_WAV_AUDIO_HANDLER_H_
#define MEDIA_AUDIO_SOUNDS_WAV_AUDIO_HANDLER_H_
#include "base/strings/string_piece.h"
#include "media/base/media_export.h"
namespace media {
class AudioBus;
// This class provides the input from wav file format. See
// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
class MEDIA_EXPORT WavAudioHandler {
public:
explicit WavAudioHandler(const base::StringPiece& wav_data);
virtual ~WavAudioHandler();
// Returns true when cursor points to the end of the track.
bool AtEnd(size_t cursor) const;
// Copies the audio data to |bus| starting from the |cursor| and in
// the case of success stores the number of written bytes in
// |bytes_written|. |bytes_written| should not be NULL.
bool CopyTo(AudioBus* bus, size_t cursor, size_t* bytes_written) const;
int size() const { return data_.size(); }
uint16 num_channels() const { return num_channels_; }
uint32 sample_rate() const { return sample_rate_; }
uint32 byte_rate() const { return byte_rate_; }
uint16 bits_per_sample() const { return bits_per_sample_; }
private:
// Parses a chunk of wav format data. Returns the length of the chunk.
int ParseSubChunk(const base::StringPiece& data);
// Parses the 'fmt' section chunk and stores |params_|.
bool ParseFmtChunk(const base::StringPiece& data);
// Parses the 'data' section chunk and stores |data_|.
bool ParseDataChunk(const base::StringPiece& data);
// Data part of the |wav_data_|.
base::StringPiece data_;
uint16 num_channels_;
uint32 sample_rate_;
uint32 byte_rate_;
uint16 bits_per_sample_;
int bytes_per_sample_;
int bytes_per_frame_;
};
} // namespace media
#endif // MEDIA_AUDIO_SOUNDS_WAV_AUDIO_HANDLER_H_
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