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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_DATA_SOURCE_H_
#define MEDIA_BASE_DATA_SOURCE_H_
#include <stdint.h>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "media/base/media_export.h"
namespace media {
class MEDIA_EXPORT DataSource {
public:
using ReadCB = base::OnceCallback<void(int)>;
enum { kReadError = -1, kAborted = -2 };
DataSource();
virtual ~DataSource();
// Reads |size| bytes from |position| into |data|. And when the read is done
// or failed, |read_cb| is called with the number of bytes read or
// kReadError in case of error.
virtual void Read(int64_t position,
int size,
uint8_t* data,
DataSource::ReadCB read_cb) = 0;
// Stops the DataSource. Once this is called all future Read() calls will
// return an error. This is a synchronous call and may be called from any
// thread. Once called, the DataSource may no longer be used and should be
// destructed shortly thereafter.
virtual void Stop() = 0;
// Similar to Stop(), but only aborts current reads and not future reads.
virtual void Abort() = 0;
// Returns true and the file size, false if the file size could not be
// retrieved.
virtual bool GetSize(int64_t* size_out) WARN_UNUSED_RESULT = 0;
// Returns true if we are performing streaming. In this case seeking is
// not possible.
virtual bool IsStreaming() = 0;
// Notify the DataSource of the bitrate of the media.
// Values of |bitrate| <= 0 are invalid and should be ignored.
virtual void SetBitrate(int bitrate) = 0;
// Assume fully bufferred by default.
virtual bool AssumeFullyBuffered() const;
// By default this just returns GetSize().
virtual int64_t GetMemoryUsage();
private:
DISALLOW_COPY_AND_ASSIGN(DataSource);
};
} // namespace media
#endif // MEDIA_BASE_DATA_SOURCE_H_
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