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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_DECODER_BUFFER_H_
#define MEDIA_BASE_DECODER_BUFFER_H_
#include <string>
#include "base/memory/aligned_memory.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "build/build_config.h"
#include "media/base/media_export.h"
namespace media {
class DecryptConfig;
// A specialized buffer for interfacing with audio / video decoders.
//
// Specifically ensures that data is aligned and padded as necessary by the
// underlying decoding framework. On desktop platforms this means memory is
// allocated using FFmpeg with particular alignment and padding requirements.
//
// Also includes decoder specific functionality for decryption.
//
// NOTE: It is illegal to call any method when IsEndOfStream() is true.
class MEDIA_EXPORT DecoderBuffer
: public base::RefCountedThreadSafe<DecoderBuffer> {
public:
enum {
kPaddingSize = 16,
#if defined(ARCH_CPU_ARM_FAMILY)
kAlignmentSize = 16
#else
kAlignmentSize = 32
#endif
};
// Allocates buffer with |size| >= 0. Buffer will be padded and aligned
// as necessary.
explicit DecoderBuffer(int size);
// Create a DecoderBuffer whose |data_| is copied from |data|. Buffer will be
// padded and aligned as necessary. |data| must not be NULL and |size| >= 0.
static scoped_refptr<DecoderBuffer> CopyFrom(const uint8* data, int size);
// Create a DecoderBuffer indicating we've reached end of stream.
//
// Calling any method other than IsEndOfStream() on the resulting buffer
// is disallowed.
static scoped_refptr<DecoderBuffer> CreateEOSBuffer();
base::TimeDelta GetTimestamp() const;
void SetTimestamp(const base::TimeDelta& timestamp);
base::TimeDelta GetDuration() const;
void SetDuration(const base::TimeDelta& duration);
const uint8* GetData() const;
uint8* GetWritableData() const;
int GetDataSize() const;
const DecryptConfig* GetDecryptConfig() const;
void SetDecryptConfig(scoped_ptr<DecryptConfig> decrypt_config);
// If there's no data in this buffer, it represents end of stream.
bool IsEndOfStream() const;
// Returns a human-readable string describing |*this|.
std::string AsHumanReadableString();
protected:
friend class base::RefCountedThreadSafe<DecoderBuffer>;
// Allocates a buffer of size |size| >= 0 and copies |data| into it. Buffer
// will be padded and aligned as necessary. If |data| is NULL then |data_| is
// set to NULL and |buffer_size_| to 0.
DecoderBuffer(const uint8* data, int size);
virtual ~DecoderBuffer();
private:
base::TimeDelta timestamp_;
base::TimeDelta duration_;
int size_;
scoped_ptr<uint8, base::ScopedPtrAlignedFree> data_;
scoped_ptr<DecryptConfig> decrypt_config_;
// Constructor helper method for memory allocations.
void Initialize();
DISALLOW_COPY_AND_ASSIGN(DecoderBuffer);
};
} // namespace media
#endif // MEDIA_BASE_DECODER_BUFFER_H_
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