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|
/*****************************************************************
|
| AP4 - E-AC-3 Sync Frame Parser
|
| Copyright 2002-2020 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_EAC3_PARSER_H_
#define _AP4_EAC3_PARSER_H_
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4BitStream.h"
#include "Ap4Dec3Atom.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
#define AP4_EAC3_HEADER_SIZE 64 /* The header size for E-AC-3 parser, syncinfo() + bsi() */
#define AP4_EAC3_SYNC_WORD_BIG_ENDIAN 0x0B77 /* Big endian, 16 sync bits */
#define AP4_EAC3_SYNC_WORD_LITTLE_ENDIAN 0x770B /* Little endian, 16 sync bits */
const AP4_UI08 GLOBAL_CHANNEL_ARY[] = {2, 1, 2, 3, 3, 4, 4, 5}; /* Channel count number from acmod value */
const AP4_UI32 EAC3_SAMPLE_RATE_ARY[] = {48000, 44100, 32000}; /* Sample rate from fscode vale */
/*----------------------------------------------------------------------
| types
+---------------------------------------------------------------------*/
class AP4_Eac3Header {
public:
// constructor
AP4_Eac3Header(const AP4_UI08* bytes);
// methods
AP4_Result Check();
AP4_UI32 m_HeadSize;
AP4_UI32 m_ChannelCount;
AP4_UI32 m_FrameSize;
// E-AC-3 bsi()
AP4_UI32 m_Strmtyp;
AP4_UI32 m_Substreamid;
AP4_UI32 m_Frmsiz;
AP4_UI32 m_Fscod;
AP4_UI32 m_Acmod;
AP4_UI32 m_Lfeon;
AP4_UI32 m_Bsid;
AP4_UI32 m_Chanmape;
AP4_UI32 m_Chanmap;
AP4_UI32 m_Infomdate;
AP4_UI32 m_Bsmod;
AP4_UI32 m_Convsync;
AP4_UI32 m_Addbsie;
AP4_UI32 m_Addbsil; // 6 bits
AP4_UI08 m_Addbsi[65]; // (addbsil + 1)* 8
// class methods
static bool MatchFixed(AP4_Eac3Header& frame, AP4_Eac3Header& next_frame);
};
typedef struct {
AP4_UI32 m_ChannelCount;
AP4_UI32 m_FrameSize;
AP4_UI32 m_SampleRate;
AP4_Dec3Atom::SubStream m_Eac3SubStream;
AP4_UI32 complexity_index_type_a;
} AP4_Eac3FrameInfo;
typedef struct {
AP4_BitStream* m_Source;
AP4_Eac3FrameInfo m_Info;
AP4_Flags m_LittleEndian;
} AP4_Eac3Frame;
class AP4_Eac3Parser {
public:
// constructor and destructor
AP4_Eac3Parser();
virtual ~AP4_Eac3Parser();
// methods
AP4_Result Reset();
AP4_Result Feed(const AP4_UI08* buffer,
AP4_Size* buffer_size,
AP4_Flags flags = 0);
AP4_Result FindFrame(AP4_Eac3Frame& frame);
AP4_Result Skip(AP4_Size size);
AP4_Size GetBytesFree();
AP4_Size GetBytesAvailable();
private:
// methods
AP4_Result FindHeader(AP4_UI08* header, AP4_Size& skip_size);
// members
AP4_BitStream m_Bits;
AP4_Cardinal m_FrameCount;
AP4_Flags m_LittleEndian;
};
#endif // _AP4_EAC3_PARSER_H_
|
