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168 lines
3.5 KiB
C++
168 lines
3.5 KiB
C++
/* $Header: /cvs/root/winamp/vlb/plainfile.cpp,v 1.1 2009/04/28 20:21:10 audiodsp Exp $ */
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/***************************************************************************\
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*
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* Copyright 2000-2002 Dolby Laboratories, Inc. All Rights
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* Reserved. Do not copy. Do not distribute.
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* Confidential information.
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*
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* (C) copyright Fraunhofer - IIS (1998)
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* All Rights Reserved
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*
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* filename: plainfile.cpp
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* project : MPEG-2 AAC Decoder
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* contents/description: tiny file reader input class
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*
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\***************************************************************************/
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#include "plainfile.h"
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#include <memory.h>
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#include <stddef.h> // for intptr_t
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const unsigned long CPlainFile::m_ValidMask [32] =
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{
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0x00000000, 0x00000001, 0x00000003, 0x00000007,
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0x0000000F, 0x0000001F, 0x0000003F, 0x0000007F,
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0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
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0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF,
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0x0000FFFF, 0x0001FFFF, 0x0003FFFF, 0x0007FFFF,
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0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
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0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF,
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0x0FFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF
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} ;
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// public
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CPlainFile::CPlainFile (DataIOControl *aacData)
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: CDolbyBitStream ()
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{
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m_InputData = aacData ;
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if (m_InputData->DICGetLastError()) throw EDoesNotExist () ;
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m_ValidBits = 0 ;
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m_Data = 0 ;
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// detect adif header
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m_sendadifbits=0;
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#if 0 // FUCK ADIF HEADERS, THEY BLOW DONKEYBALLZ
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memset(m_tmpadifbits,0,sizeof(m_tmpadifbits));
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m_InputData->IO(m_tmpadifbits, 1, 4) ;
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//m_InputData->Seek(0,SEEK_SET) ;
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char *adif=m_tmpadifbits;
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if ((adif [0] == 'A') &&
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(adif [1] == 'D') &&
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(adif [2] == 'I') &&
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(adif [3] == 'F')
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)
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{
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m_AdifHeaderPresent = true ;
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m_sendadifbits=0;
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}
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else
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if ((adif [0] == 'R') &&
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(adif [1] == 'I') &&
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(adif [2] == 'F') &&
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(adif [3] == 'F')
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)
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{
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m_RiffHeaderPresent = true ;
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m_sendadifbits=0;
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}
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#endif
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}
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CPlainFile::~CPlainFile ()
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{
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//fclose (m_InputFile) ;
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}
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long CPlainFile::Get (int n)
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{
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if (m_ValidBits <= 16)
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{
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m_Data = (m_Data << 16) | GetShort () ;
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m_ValidBits += 16 ;
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}
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m_ValidBits -= n ;
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return ((m_Data >> m_ValidBits) & m_ValidMask [n]) ;
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}
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void CPlainFile::ByteAlign (void)
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{
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if (m_ValidBits <= 16)
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{
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m_Data = (m_Data << 16) | GetShort () ;
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m_ValidBits += 16 ;
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}
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while (m_ValidBits & 0x07)
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{
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m_ValidBits-- ;
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}
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}
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void CPlainFile::PushBack (int n)
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{
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m_ValidBits += n ;
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}
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int CPlainFile::Read (void *pData, int cBytes)
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{
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if(m_sendadifbits)
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{
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cBytes-=4; //CT> I assume that it'll always be >4 at this point in the exec.
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memcpy(pData,m_tmpadifbits,4);
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intptr_t a=(intptr_t)pData+4;
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pData=(void*)a;
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m_sendadifbits=0;
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}
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return m_InputData->IO(pData,1,cBytes) ;
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}
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// protected
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long CPlainFile::GetShort (void)
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{
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int c1;
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int c2;
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m_InputData->IO(&c1,1,1);
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m_InputData->IO(&c2,1,1);
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if (m_InputData->EndOf())
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throw EEndOfFile () ;
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c1&=0xff;
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c2&=0xff;
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return (c1 << 8) | c2 ;
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}
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#define SYNCWORD 0x0fff
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#define SYNCMASK 0x0fff
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#define SYNCLENGTH 12
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#define REMLENGTH 16
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#define MAX_SEARCH 100000
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int CPlainFile::LockAndLoad()
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{
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int iCount;
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unsigned int dwSync;
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dwSync=0;
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iCount=0;
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while(iCount<MAX_SEARCH && dwSync!=SYNCWORD){
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int iTemp;
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dwSync<<=8;
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m_InputData->IO(&iTemp,1,1);
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if (m_InputData->EndOf())
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throw EEndOfFile () ;
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dwSync+=iTemp;
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dwSync&=SYNCMASK;
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iCount++;
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}
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m_Data=dwSync;
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m_ValidBits=REMLENGTH;
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if(iCount<MAX_SEARCH) return 1;
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else return 0;
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}
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