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The coefficients for the polyphase filterbank are the following. They are arranged as a [2*12][16] array. The first index (row) is the tap number, the second index is nearly the number of the sample in the IDCT16 result.

5.8336207e-7 -8.0604229e-7 -4.2005411e-7 -4.4400572e-8 3.2262470e-8 3.5308560e-8 1.2660377e-8 1.0516783e-5 -1.1838618e-5 6.0053890e-7 1.4333754e-6 2.3108685e-6 3.2569742e-6 4.6192422e-6 6.3894258e-6 7.0302972e-6
9.1622824e-6 -1.0502935e-5 -7.9212787e-6 -4.1712024e-6 -2.6336629e-6 -1.5432918e-6 -5.7168614e-7 1.8111954e-6 2.3530851e-5 2.7805620e-5 3.2302323e-5 3.6968919e-5 4.1575615e-5 4.5337845e-5 4.6043948e-5 4.8585582e-5
6.4464548e-5 -6.8306952e-5 -7.3081472e-5 -7.6127850e-5 -7.4850752e-5 -7.0208509e-5 -6.2285151e-5 -5.8270442e-5 -5.6296329e-5 -4.9888811e-5 -3.5615325e-5 -1.8532943e-5 1.6657353e-6 2.6105870e-5 5.3397067e-5 8.0795660e-5
5.4488552e-4 -5.2537228e-4 -4.9731287e-4 -4.5778000e-4 -4.0612387e-4 -3.4301577e-4 -2.6866337e-4 -1.8248901e-4 -8.4307925e-5 2.5081157e-5 1.4135583e-4 2.6649953e-4 3.9945057e-4 5.3928449e-4 6.8422867e-4 8.3093712e-4
1.4771431e-3 -1.2832270e-3 -1.0566821e-3 -7.9780724e-4 -5.0782406e-4 -1.8855913e-4 1.5771533e-4 5.2769453e-4 9.1862219e-4 1.3263570e-3 1.7469483e-3 2.1754825e-3 2.6067684e-3 3.0352892e-3 3.4549395e-3 3.8591374e-3
2.2995141e-3 -1.4435460e-3 -4.9266568e-4 5.5068987e-4 1.6828950e-3 2.8992873e-3 4.1943151e-3 5.5614738e-3 6.9935122e-3 8.4823566e-3 1.0018963e-2 1.1593862e-2 1.3196872e-2 1.4817309e-2 1.6444042e-2 1.8065533e-2
3.4426283e-2 -3.4281436e-2 -3.3992987e-2 -3.3563249e-2 -3.2995768e-2 -3.2295227e-2 -3.1467363e-2 -3.0518902e-2 -2.9457660e-2 -2.8291954e-2 -2.7031265e-2 -2.5685543e-2 -2.4265358e-2 -2.2781773e-2 -2.1246184e-2 -1.9670162e-2
3.0586775e-3 -3.7203205e-3 -4.2847847e-3 -4.7529764e-3 -5.1268316e-3 -5.4091476e-3 -5.6034233e-3 -5.7142610e-3 -5.7445862e-3 -5.7025906e-3 -5.5920109e-3 -5.4194843e-3 -5.1914565e-3 -4.9146507e-3 -4.5959447e-3 -4.2418269e-3
1.6376863e-3 -1.7651899e-3 -1.8608454e-3 -1.9252141e-3 -1.9593791e-3 -1.9653172e-3 -1.9450618e-3 -1.8990048e-3 -1.8380800e-3 -1.7501717e-3 -1.6481078e-3 -1.5320742e-3 -1.4046903e-3 -1.2685474e-3 -1.1258140e-3 -9.7943726e-4
5.5432378e-4 -5.5472925e-4 -5.4783461e-4 -5.3276919e-4 -5.1135791e-4 -4.8466062e-4 -4.5358928e-4 -4.2499689e-4 -3.6942671e-4 -3.3926190e-4 -3.0001783e-4 -2.5986304e-4 -2.1972040e-4 -1.8116167e-4 -1.4691355e-4 -1.1279432e-4
6.4147389e-5 -6.1748680e-5 -5.4267788e-5 -4.7133824e-5 -4.2927582e-5 -3.9477309e-5 -3.6340745e-5 -2.9687517e-5 -4.9787737e-5 -4.1577889e-5 -3.3864744e-5 -2.6534748e-5 -1.9841305e-5 -1.4789486e-5 -1.3131184e-5 -9.9198869e-6
6.2990207e-6 -7.2701259e-6 -1.1984052e-5 -1.7348082e-5 -1.9907106e-5 -2.1348773e-5 -2.1961965e-5 -1.2203576e-5 -1.0840992e-5 4.6299544e-7 5.2588763e-7 2.7792686e-7 -2.3649704e-7 -1.0897784e-6 -9.1714480e-7 -5.2268200e-7

5.2268200e-7 9.1714480e-7 1.0897784e-6 2.3649704e-7 -2.7792686e-7 -5.2588763e-7 -4.6299544e-7 1.0840992e-5 -1.2203576e-5 -2.1961965e-5 -2.1348773e-5 -1.9907106e-5 -1.7348082e-5 -1.1984052e-5 -7.2701259e-6 -6.2990207e-6

 9.9198869e-6   1.3131184e-5   1.4789486e-5   1.9841305e-5   2.6534748e-5   3.3864744e-5   4.1577889e-5   4.9787737e-5  -2.9687517e-5  -3.6340745e-5  -3.9477309e-5  -4.2927582e-5  -4.7133824e-5  -5.4267788e-5  -6.1748680e-5  -6.4147389e-5
 1.1279432e-4   1.4691355e-4   1.8116167e-4   2.1972040e-4   2.5986304e-4   3.0001783e-4   3.3926190e-4   3.6942671e-4  -4.2499689e-4  -4.5358928e-4  -4.8466062e-4  -5.1135791e-4  -5.3276919e-4  -5.4783461e-4  -5.5472925e-4  -5.5432378e-4
 9.7943726e-4   1.1258140e-3   1.2685474e-3   1.4046903e-3   1.5320742e-3   1.6481078e-3   1.7501717e-3   1.8380800e-3  -1.8990048e-3  -1.9450618e-3  -1.9653172e-3  -1.9593791e-3  -1.9252141e-3  -1.8608454e-3  -1.7651899e-3  -1.6376863e-3
 4.2418269e-3   4.5959447e-3   4.9146507e-3   5.1914565e-3   5.4194843e-3   5.5920109e-3   5.7025906e-3   5.7445862e-3  -5.7142610e-3  -5.6034233e-3  -5.4091476e-3  -5.1268316e-3  -4.7529764e-3  -4.2847847e-3  -3.7203205e-3  -3.0586775e-3
 1.9670162e-2   2.1246184e-2   2.2781773e-2   2.4265358e-2   2.5685543e-2   2.7031265e-2   2.8291954e-2   2.9457660e-2  -3.0518902e-2  -3.1467363e-2  -3.2295227e-2  -3.2995768e-2  -3.3563249e-2  -3.3992987e-2  -3.4281436e-2  -3.4426283e-2
-1.8065533e-2  -1.6444042e-2  -1.4817309e-2  -1.3196872e-2  -1.1593862e-2  -1.0018963e-2  -8.4823566e-3  -6.9935122e-3   5.5614738e-3   4.1943151e-3   2.8992873e-3   1.6828950e-3   5.5068987e-4  -4.9266568e-4  -1.4435460e-3  -2.2995141e-3
-3.8591374e-3  -3.4549395e-3  -3.0352892e-3  -2.6067684e-3  -2.1754825e-3  -1.7469483e-3  -1.3263570e-3  -9.1862219e-4   5.2769453e-4   1.5771533e-4  -1.8855913e-4  -5.0782406e-4  -7.9780724e-4  -1.0566821e-3  -1.2832270e-3  -1.4771431e-3
-8.3093712e-4  -6.8422867e-4  -5.3928449e-4  -3.9945057e-4  -2.6649953e-4  -1.4135583e-4  -2.5081157e-5   8.4307925e-5  -1.8248901e-4  -2.6866337e-4  -3.4301577e-4  -4.0612387e-4  -4.5778000e-4  -4.9731287e-4  -5.2537228e-4  -5.4488552e-4
-8.0795660e-5  -5.3397067e-5  -2.6105870e-5  -1.6657353e-6   1.8532943e-5   3.5615325e-5   4.9888811e-5   5.6296329e-5  -5.8270442e-5  -6.2285151e-5  -7.0208509e-5  -7.4850752e-5  -7.6127850e-5  -7.3081472e-5  -6.8306952e-5  -6.4464548e-5
-4.8585582e-5  -4.6043948e-5  -4.5337845e-5  -4.1575615e-5  -3.6968919e-5  -3.2302323e-5  -2.7805620e-5  -2.3530851e-5   1.8111954e-6  -5.7168614e-7  -1.5432918e-6  -2.6336629e-6  -4.1712024e-6  -7.9212787e-6  -1.0502935e-5  -9.1622824e-6
-7.0302972e-6  -6.3894258e-6  -4.6192422e-6  -3.2569742e-6  -2.3108685e-6  -1.4333754e-6  -6.0053890e-7   1.1838618e-5   1.0516783e-5   1.2660377e-8   3.5308560e-8   3.2262470e-8  -4.4400572e-8  -4.2005411e-7  -8.0604229e-7  -5.8336207e-7