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|
/*****************************************************************
|
| AP4 - AAC ADTS Parser
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
#ifndef _AP4_ADTS_PARSER_H_
#define _AP4_ADTS_PARSER_H_
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4BitStream.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
extern const unsigned long AP4_AdtsSamplingFrequencyTable[16];
/*----------------------------------------------------------------------
| types
+---------------------------------------------------------------------*/
class AP4_AdtsHeader {
public:
// constructor
AP4_AdtsHeader(const AP4_UI08* bytes);
// methods
AP4_Result Check();
// members
// fixed part
unsigned int m_Id;
unsigned int m_ProtectionAbsent;
unsigned int m_ProfileObjectType;
unsigned int m_SamplingFrequencyIndex;
unsigned int m_ChannelConfiguration;
// variable part
unsigned int m_FrameLength;
unsigned int m_RawDataBlocks;
// class methods
static bool MatchFixed(unsigned char* a, unsigned char* b);
};
typedef enum {
AP4_AAC_STANDARD_MPEG2,
AP4_AAC_STANDARD_MPEG4
} AP4_AacStandard;
typedef enum {
AP4_AAC_PROFILE_MAIN,
AP4_AAC_PROFILE_LC,
AP4_AAC_PROFILE_SSR,
AP4_AAC_PROFILE_LTP
} AP4_AacProfile;
typedef struct {
AP4_AacStandard m_Standard;
AP4_AacProfile m_Profile;
unsigned int m_SamplingFrequencyIndex;
unsigned long m_SamplingFrequency;
unsigned int m_ChannelConfiguration;
unsigned int m_FrameLength;
} AP4_AacFrameInfo;
typedef struct {
AP4_BitStream* m_Source;
AP4_AacFrameInfo m_Info;
} AP4_AacFrame;
class AP4_AdtsParser {
public:
// constructor and destructor
AP4_AdtsParser();
virtual ~AP4_AdtsParser();
// methods
AP4_Result Reset();
AP4_Result Feed(const AP4_UI08* buffer,
AP4_Size* buffer_size,
AP4_Flags flags = 0);
AP4_Result FindFrame(AP4_AacFrame& frame);
AP4_Result Skip(AP4_Size size);
AP4_Size GetBytesFree();
AP4_Size GetBytesAvailable();
private:
// methods
AP4_Result FindHeader(AP4_UI08* header);
// members
AP4_BitStream m_Bits;
AP4_Cardinal m_FrameCount;
};
#endif // _AP4_ADTS_PARSER_H_
|
