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ImfTimeCode.cpp

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////


//-----------------------------------------------------------------------------
//
//    class TimeCode
//    
//-----------------------------------------------------------------------------

#include <ImfTimeCode.h>
#include <Iex.h>

namespace Imf {

   
TimeCode::TimeCode ()
{
    _time = 0;
    _user = 0;
}


TimeCode::TimeCode
    (int hours,
     int minutes,
     int seconds,
     int frame,
     bool dropFrame,
     bool colorFrame,
     bool fieldPhase,
     bool bgf0,
     bool bgf1,
     bool bgf2,
     int binaryGroup1,
     int binaryGroup2,
     int binaryGroup3,
     int binaryGroup4,
     int binaryGroup5,
     int binaryGroup6,
     int binaryGroup7,
     int binaryGroup8)
{
    setHours (hours);
    setMinutes (minutes);
    setSeconds (seconds);
    setFrame (frame);
    setDropFrame (dropFrame);
    setColorFrame (colorFrame);
    setFieldPhase (fieldPhase);
    setBgf0 (bgf0);
    setBgf1 (bgf1);
    setBgf2 (bgf2);
    setBinaryGroup (1, binaryGroup1);
    setBinaryGroup (2, binaryGroup2);
    setBinaryGroup (3, binaryGroup3);
    setBinaryGroup (4, binaryGroup4);
    setBinaryGroup (5, binaryGroup5);
    setBinaryGroup (6, binaryGroup6);
    setBinaryGroup (7, binaryGroup7);
    setBinaryGroup (8, binaryGroup8);
}


TimeCode::TimeCode
    (unsigned int timeAndFlags,
     unsigned int userData,
     Packing packing)
{
    setTimeAndFlags (timeAndFlags, packing);
    setUserData (userData);
}


TimeCode::TimeCode (const TimeCode &other)
{
    _time = other._time;
    _user = other._user;
}


TimeCode &
TimeCode::operator = (const TimeCode &other)
{
    _time = other._time;
    _user = other._user;
    return *this;
}


namespace {

unsigned int
bitField (unsigned int value, int minBit, int maxBit)
{
    int shift = minBit;
    unsigned int mask = (~(~0U << (maxBit - minBit + 1)) << minBit);
    return (value & mask) >> shift;
}


void
setBitField (unsigned int &value, int minBit, int maxBit, unsigned int field)
{
    int shift = minBit;
    unsigned int mask = (~(~0U << (maxBit - minBit + 1)) << minBit);
    value = ((value & ~mask) | ((field << shift) & mask));
}


int
bcdToBinary (unsigned int bcd)
{
    return int ((bcd & 0x0f) + 10 * ((bcd >> 4) & 0x0f));
}


unsigned int
binaryToBcd (int binary)
{
    int units = binary % 10;
    int tens = (binary / 10) % 10;
    return (unsigned int) (units | (tens << 4));
}


} // namespace


int
TimeCode::hours () const
{
    return bcdToBinary (bitField (_time, 24, 29));
}


void
TimeCode::setHours (int value)
{
    if (value < 0 || value > 23)
      throw Iex::ArgExc ("Cannot set hours field in time code. "
                     "New value is out of range.");

    setBitField (_time, 24, 29, binaryToBcd (value));
}


int
TimeCode::minutes () const
{
    return bcdToBinary (bitField (_time, 16, 22));
}


void
TimeCode::setMinutes (int value)
{
    if (value < 0 || value > 59)
      throw Iex::ArgExc ("Cannot set minutes field in time code. "
                     "New value is out of range.");

    setBitField (_time, 16, 22, binaryToBcd (value));
}


int
TimeCode::seconds () const
{
    return bcdToBinary (bitField (_time, 8, 14));
}


void
TimeCode::setSeconds (int value)
{
    if (value < 0 || value > 59)
      throw Iex::ArgExc ("Cannot set seconds field in time code. "
                     "New value is out of range.");

    setBitField (_time, 8, 14, binaryToBcd (value));
}


int
TimeCode::frame () const
{
    return bcdToBinary (bitField (_time, 0, 5));
}


void
TimeCode::setFrame (int value)
{
    if (value < 0 || value > 59)
      throw Iex::ArgExc ("Cannot set frame field in time code. "
                     "New value is out of range.");

    setBitField (_time, 0, 5, binaryToBcd (value));
}


bool
TimeCode::dropFrame () const
{
    return bool (bitField (_time, 6, 6));
}


void
TimeCode::setDropFrame (bool value)
{
    setBitField (_time, 6, 6, (unsigned int) !!value);
}


bool
TimeCode::colorFrame () const
{
    return bool (bitField (_time, 7, 7));
}


void
TimeCode::setColorFrame (bool value)
{
    setBitField (_time, 7, 7, (unsigned int) !!value);
}


bool
TimeCode::fieldPhase () const
{
    return bool (bitField (_time, 15, 15));
}


void
TimeCode::setFieldPhase (bool value)
{
    setBitField (_time, 15, 15, (unsigned int) !!value);
}


bool
TimeCode::bgf0 () const
{
    return bool (bitField (_time, 23, 23));
}


void
TimeCode::setBgf0 (bool value)
{
    setBitField (_time, 23, 23, (unsigned int) !!value);
}


bool
TimeCode::bgf1 () const
{
    return bool (bitField (_time, 30, 30));
}


void
TimeCode::setBgf1 (bool value)
{
    setBitField (_time, 30, 30, (unsigned int) !!value);
}


bool
TimeCode::bgf2 () const
{
    return bool (bitField (_time, 31, 31));
}


void
TimeCode::setBgf2 (bool value)
{
    setBitField (_time, 31, 31, (unsigned int) !!value);
}


int
TimeCode::binaryGroup (int group) const
{
    if (group < 1 || group > 8)
      throw Iex::ArgExc ("Cannot extract binary group from time code "
                       "user data.  Group number is out of range.");

    int minBit = 4 * (group - 1);
    int maxBit = minBit + 3;
    return int (bitField (_user, minBit, maxBit));
}


void
TimeCode::setBinaryGroup (int group, int value)
{
    if (group < 1 || group > 8)
      throw Iex::ArgExc ("Cannot extract binary group from time code "
                       "user data.  Group number is out of range.");

    int minBit = 4 * (group - 1);
    int maxBit = minBit + 3;
    setBitField (_user, minBit, maxBit, (unsigned int) value);
}


unsigned int
TimeCode::timeAndFlags (Packing packing) const
{
    if (packing == TV50_PACKING)
    {
      unsigned int t = _time;

      t &= ~((1 << 6) | (1 << 15) | (1 << 23) | (1 << 30) | (1 << 31));

      t |= ((unsigned int) bgf0() << 15);
      t |= ((unsigned int) bgf2() << 23);
      t |= ((unsigned int) bgf1() << 30);
      t |= ((unsigned int) fieldPhase() << 31);

      return t;
    }
    if (packing == FILM24_PACKING)
    {
      return _time & ~((1 << 6) | (1 << 7));
    }
    else // packing == TV60_PACKING
    {
      return _time;
    }
}


void
TimeCode::setTimeAndFlags (unsigned int value, Packing packing)
{
    if (packing == TV50_PACKING)
    {
      _time = value &
             ~((1 << 6) | (1 << 15) | (1 << 23) | (1 << 30) | (1 << 31));

      if (value & (1 << 15))
          setBgf0 (true);

      if (value & (1 << 23))
          setBgf2 (true);

      if (value & (1 << 30))
          setBgf1 (true);

      if (value & (1 << 31))
          setFieldPhase (true);
    }
    else if (packing == FILM24_PACKING)
    {
      _time = value & ~((1 << 6) | (1 << 7));
    }
    else // packing == TV60_PACKING
    {
      _time = value;
    }
}


unsigned int
TimeCode::userData () const
{
    return _user;
}


void
TimeCode::setUserData (unsigned int value)
{
    _user = value;
}


} // namespace Imf

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