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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.
// 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.
#ifndef MEDIA_BASE_DECODER_BUFFER_H_
#define MEDIA_BASE_DECODER_BUFFER_H_
#include "base/memory/aligned_memory.h"
#include "base/memory/scoped_ptr.h"
#include "build/build_config.h"
#include "media/base/buffers.h"
#include "media/base/decrypt_config.h"
namespace media {
class MEDIA_EXPORT DecoderBuffer : public Buffer {
public:
enum {
kPaddingSize = 16,
#if defined(ARCH_CPU_ARM_FAMILY)
kAlignmentSize = 16
#else
kAlignmentSize = 32
#endif
};
// Allocates buffer of size |buffer_size| >= 0. Buffer will be padded and
// aligned as necessary.
explicit DecoderBuffer(int buffer_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. GetData()
// and GetWritableData() will return NULL and GetDataSize() will return 0.
static scoped_refptr<DecoderBuffer> CreateEOSBuffer();
// Buffer implementation.
virtual const uint8* GetData() const OVERRIDE;
virtual int GetDataSize() const OVERRIDE;
// Returns a read-write pointer to the buffer data.
virtual uint8* GetWritableData();
virtual const DecryptConfig* GetDecryptConfig() const;
virtual void SetDecryptConfig(scoped_ptr<DecryptConfig> decrypt_config);
protected:
// 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:
int buffer_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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