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/** \file     VLCReader.cpp

 *  \brief    Reader for high level syntax

 */

//! \ingroup DecoderLib

//! \{

#include "VLCReader.h"

#include "CommonLib/CommonDef.h"

#include "CommonLib/dtrace_next.h"

namespace vvdec

{

// ====================================================================================================================

//  read functions taking a reference for the result value

// ====================================================================================================================

void VLCReader::xReadFlag( uint32_t& ruiCode )

{

  ruiCode = m_pcBitstream->read( 1 );

}

void VLCReader::xReadUvlc( uint32_t& ruiVal )

{

  ruiVal = xReadUvlc();

}

void VLCReader::xReadSvlc( int32_t& riVal )

{

  riVal = xReadSvlc();

}

void VLCReader::xReadCode( uint32_t uiLength, uint32_t& ruiCode )

{

  CHECK( uiLength == 0, "Reading a code of lenght '0'" );

  ruiCode = m_pcBitstream->read( uiLength );

}

void VLCReader::xReadSCode( uint32_t length, int32_t& value )

{

  CHECK( length == 0 || length > 31, "wrong" );

  uint32_t val = m_pcBitstream->read( length );

  value = length >= 32 ? int32_t( val ) : ( ( -int32_t( val & ( uint32_t( 1 ) << ( length - 1 ) ) ) ) | int32_t( val ) );

}

void VLCReader::xReadFlag( uint32_t& rValue, const char *pSymbolName )

{

  xReadFlag( rValue );

  DTRACE( g_trace_ctx, D_HEADER, "%-50s u(1)  : %d\n", pSymbolName, rValue );

}

void VLCReader::xReadUvlc( uint32_t& rValue, const char *pSymbolName )

{

  xReadUvlc( rValue );

  DTRACE( g_trace_ctx, D_HEADER, "%-50s ue(v) : %u\n", pSymbolName, rValue );

}

void VLCReader::xReadSvlc( int32_t& rValue, const char *pSymbolName )

{

  xReadSvlc( rValue );

  DTRACE( g_trace_ctx, D_HEADER, "%-50s se(v) : %d\n", pSymbolName, rValue );

}

void VLCReader::xReadCode( uint32_t length, uint32_t& rValue, const char *pSymbolName )

{

  xReadCode( length, rValue );

  if( length < 10 )

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s u(%d)  : %u\n", pSymbolName, length, rValue );

  }

  else

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s u(%d) : %u\n", pSymbolName, length, rValue );

  }

}

void VLCReader::xReadSCode( uint32_t length, int32_t& value, const char *pSymbolName )

{

  xReadSCode( length, value );

  if( length < 10 )

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s i(%d)  : %d\n", pSymbolName, length, value );

  }

  else

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s i(%d) : %d\n", pSymbolName, length, value );

  }

}

// ====================================================================================================================

//  read functions returning the result value

// ====================================================================================================================

bool VLCReader::xReadFlag()

{

  return m_pcBitstream->read( 1 ) & 0x1;

}

uint32_t VLCReader::xReadUvlc()

{

  uint32_t uiVal = 0;

  uint32_t uiCode = 0;

  uint32_t uiLength = 0;

  uiCode = m_pcBitstream->read( 1 );

  if( 0 == uiCode )

  {

    uiLength = 0;

    while( ! ( uiCode & 1 ) )

    {

      uiCode = m_pcBitstream->read( 1 );

      uiLength++;

    }

    CHECK( uiLength > 31, "UVLC length overflow" );

    uiVal = m_pcBitstream->read( uiLength );

    uiVal += ( 1u << uiLength ) - 1;

  }

  return uiVal;

}

int32_t VLCReader::xReadSvlc()

{

  uint32_t uiBits = m_pcBitstream->read( 1 );

  if( 0 == uiBits )

  {

    uint32_t uiLength = 0;

    while( ! ( uiBits & 1 ) )

    {

      uiBits = m_pcBitstream->read( 1 );

      uiLength++;

    }

    CHECK( uiLength > 30, "SVLC length overflow" );

    uiBits = m_pcBitstream->read( uiLength );

    uiBits += ( 1u << uiLength );

    return ( uiBits & 1 ) ? -(int32_t)( uiBits>>1 ) : (int32_t)( uiBits>>1 );

  }

  else

  {

    return  0;

  }

}

uint32_t VLCReader::xReadCode( uint32_t uiLength )

{

  CHECK( uiLength == 0, "Reading a code of lenght '0'" );

  return m_pcBitstream->read( uiLength );

}

int32_t VLCReader::xReadSCode( uint32_t length )

{

  CHECK( length == 0 || length > 31, "wrong" );

  uint32_t val = m_pcBitstream->read( length );

  return  ( -int32_t( val & ( 1u << ( length - 1 ) ) ) ) | int32_t( val ) ;

}

bool VLCReader::xReadFlag( const char* pSymbolName )

{

  bool value = xReadFlag();

  DTRACE( g_trace_ctx, D_HEADER, "%-50s u(1)  : %d\n", pSymbolName, value );

  return value;

}

uint32_t VLCReader::xReadUvlc( const char* pSymbolName )

{

  uint32_t value = xReadUvlc();

  DTRACE( g_trace_ctx, D_HEADER, "%-50s ue(v) : %u\n", pSymbolName, value );

  return value;

}

int32_t VLCReader::xReadSvlc( const char* pSymbolName )

{

  int32_t value = xReadSvlc();

  DTRACE( g_trace_ctx, D_HEADER, "%-50s se(v) : %d\n", pSymbolName, value );

  return value;

}

uint32_t VLCReader::xReadCode( uint32_t length, const char* pSymbolName )

{

  uint32_t value = xReadCode( length );

  if( length < 10 )

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s u(%d)  : %u\n", pSymbolName, length, value );

  }

  else

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s u(%d) : %u\n", pSymbolName, length, value );

  }

  return value;

}

int32_t VLCReader::xReadSCode( uint32_t length, const char* pSymbolName )

{

  int32_t value = xReadSCode( length );

  if( length < 10 )

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s i(%d)  : %d\n", pSymbolName, length, value );

  }

  else

  {

    DTRACE( g_trace_ctx, D_HEADER, "%-50s i(%d) : %d\n", pSymbolName, length, value );

  }

  return value;

}

void VLCReader::xReadRbspTrailingBits()

{

  X_READ_FLAG( rbsp_stop_one_bit );

  CHECK( rbsp_stop_one_bit != 1, "Trailing bit not '1'" );

  int cnt = 0;

  while( m_pcBitstream->getNumBitsUntilByteAligned() )

  {

    X_READ_FLAG( rbsp_alignment_zero_bit );

    CHECK( rbsp_alignment_zero_bit != 0, "Alignment bit is not '0'" );

    cnt++;

  }

  CHECK( cnt >= 8, "Read more than '8' trailing bits" );

}

}   // namespace vvdec