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// Copyright 2015 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_AUDIO_DEBUG_FILE_WRITER_H_
#define MEDIA_AUDIO_AUDIO_DEBUG_FILE_WRITER_H_
#include <stdint.h>
#include <memory>
#include "base/files/file.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "base/sequenced_task_runner.h"
#include "base/task_scheduler/post_task.h"
#include "media/base/audio_parameters.h"
#include "media/base/media_export.h"
namespace media {
class AudioBus;
// Writes audio data to a 16 bit PCM WAVE file used for debugging purposes. All
// operations are non-blocking.
// Functions are virtual for the purpose of test mocking.
class MEDIA_EXPORT AudioDebugFileWriter {
public:
// Number of channels and sample rate are used from |params|, the other
// parameters are ignored. The number of channels in the data passed to
// Write() must match |params|.
AudioDebugFileWriter(const AudioParameters& params);
virtual ~AudioDebugFileWriter();
// Must be called before calling Write() for the first time after creation or
// Stop() call. Can be called on any sequence; Write() and Stop() must be
// called on the same sequence as Start().
virtual void Start(const base::FilePath& file);
// Must be called to finish recording. Each call to Start() requires a call to
// Stop(). Will be automatically called on destruction.
virtual void Stop();
// Write |data| to file.
virtual void Write(std::unique_ptr<AudioBus> data);
// Returns true if Write() call scheduled at this point will most likely write
// data to the file, and false if it most likely will be a no-op. The result
// may be ambigulous if Start() or Stop() is executed at the moment. Can be
// called from any sequence.
virtual bool WillWrite();
// Gets the extension for the file type the as a string, for example "wav".
// Can be called before calling Start() to add the appropriate extension to
// the filename.
virtual const base::FilePath::CharType* GetFileNameExtension();
protected:
const AudioParameters params_;
private:
class AudioFileWriter;
// Deleter for AudioFileWriter.
struct OnSequenceDeleter {
public:
OnSequenceDeleter();
OnSequenceDeleter(OnSequenceDeleter&& other);
OnSequenceDeleter& operator=(OnSequenceDeleter&&);
OnSequenceDeleter(scoped_refptr<base::SequencedTaskRunner> task_runner);
~OnSequenceDeleter();
void operator()(AudioFileWriter* ptr) const;
private:
scoped_refptr<base::SequencedTaskRunner> task_runner_;
};
using AudioFileWriterUniquePtr =
std::unique_ptr<AudioFileWriter, OnSequenceDeleter>;
AudioFileWriterUniquePtr file_writer_;
base::SequenceChecker client_sequence_checker_;
// The task runner to do file output operations on.
const scoped_refptr<base::SequencedTaskRunner> file_task_runner_ =
base::CreateSequencedTaskRunnerWithTraits(
{base::MayBlock(), base::TaskPriority::BACKGROUND});
DISALLOW_COPY_AND_ASSIGN(AudioDebugFileWriter);
};
} // namspace media
#endif // MEDIA_AUDIO_AUDIO_DEBUG_FILE_WRITER_H_
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