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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_BUFFER_H_
#define MEDIA_BASE_DATA_BUFFER_H_
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "media/base/media_export.h"
namespace media {
// A simple buffer that takes ownership of the given data pointer or allocates
// as necessary.
//
// Unlike DecoderBuffer, allocations are assumed to be allocated with the
// default memory allocator (i.e., new uint8[]).
//
// NOTE: It is illegal to call any method when end_of_stream() is true.
class MEDIA_EXPORT DataBuffer : public base::RefCountedThreadSafe<DataBuffer> {
public:
// Allocates buffer of size |buffer_size| >= 0.
explicit DataBuffer(int buffer_size);
// Assumes valid data of size |buffer_size|.
DataBuffer(scoped_ptr<uint8[]> buffer, int buffer_size);
// Create a DataBuffer whose |data_| is copied from |data|.
//
// |data| must not be null and |size| must be >= 0.
static scoped_refptr<DataBuffer> CopyFrom(const uint8* data, int size);
// Create a DataBuffer indicating we've reached end of stream.
//
// Calling any method other than end_of_stream() on the resulting buffer
// is disallowed.
static scoped_refptr<DataBuffer> CreateEOSBuffer();
base::TimeDelta timestamp() const {
DCHECK(!end_of_stream());
return timestamp_;
}
void set_timestamp(const base::TimeDelta& timestamp) {
DCHECK(!end_of_stream());
timestamp_ = timestamp;
}
base::TimeDelta duration() const {
DCHECK(!end_of_stream());
return duration_;
}
void set_duration(const base::TimeDelta& duration) {
DCHECK(!end_of_stream());
duration_ = duration;
}
const uint8* data() const {
DCHECK(!end_of_stream());
return data_.get();
}
uint8* writable_data() {
DCHECK(!end_of_stream());
return data_.get();
}
// The size of valid data in bytes.
//
// Setting this value beyond the buffer size is disallowed.
int data_size() const {
DCHECK(!end_of_stream());
return data_size_;
}
void set_data_size(int data_size) {
DCHECK(!end_of_stream());
CHECK_LE(data_size, buffer_size_);
data_size_ = data_size;
}
// If there's no data in this buffer, it represents end of stream.
bool end_of_stream() const { return data_ == NULL; }
protected:
friend class base::RefCountedThreadSafe<DataBuffer>;
// Allocates buffer of size |data_size|, copies [data,data+data_size) to
// the allocated buffer and sets data size to |data_size|.
//
// If |data| is null an end of stream buffer is created.
DataBuffer(const uint8* data, int data_size);
virtual ~DataBuffer();
private:
base::TimeDelta timestamp_;
base::TimeDelta duration_;
scoped_ptr<uint8[]> data_;
int buffer_size_;
int data_size_;
DISALLOW_COPY_AND_ASSIGN(DataBuffer);
};
} // namespace media
#endif // MEDIA_BASE_DATA_BUFFER_H_
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