void __thiscall CVehicleAudio::UpdateAutomobileEngine(CVehicleAudio *this, TempVehicleAudioData *tempData)
{
  int i; // esi@1
  CVehicleAudio *audio; // edi@1
  char engineOff; // zf@1
  double v5; // st7@5
  double engineStatus; // st7@7
  CMatrix v7; // [sp+8h] [bp-54h]@1
  int _seh; // [sp+58h] [bp-4h]@1
  float _engineStatus; // [sp+60h] [bp+4h]@10
  float volume; // [sp+60h] [bp+4h]@10

  i = 0;
  audio = this;
  v7.m_pAttachMatrix = 0;                       // CMatrix v7;
  v7.m_bAttachMatrixTemporary = 0;
  engineOff = (tempData->m_pVehicle->vehicle.m_anVehicleFlags[0] & ENGINE_ON) == 0;
  _seh = 0;
  if ( engineOff )
  {
    do
      CVehicleAudio::StopVehicleSound(audio, i++);
    while ( (signed __int16)i < 12 );
    goto @@return;
  }
  if ( !CAudioPlayer::IsBankInSlot(&g_AudioPlayer, 138u, 19) )
    goto @@return;
  v5 = *(float *)&tempData->m_pVehicle->m_sDamageManager.m_nEngineStatus * 4.5454545;
  if ( v5 <= 1.0 )
  {
    if ( v5 < 0.2 )
    {
      engineStatus = 0.0;
      goto LABEL_8;
    }
  }
  else
  {
    v5 = 1.0;
  }
  engineStatus = (v5 - 0.2) * 1.25;
LABEL_8:
  if ( engineStatus <= 0.2 )
    engineStatus = 0.2;
  _engineStatus = engineStatus;
  volume = sub_4D9E50(_engineStatus) * 20.0 + 8.0;
  CVehicleAudio::AddSound(audio, 3, 19, 17, volume, 1.0);
@@return:
  _seh = -1;
  CMatrix::_CMatrix(&v7);
}