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'decode_spectrum' reads 5 bits from bitstream to get number of encoded subbands – so 31 means all 32 subbands are encoded. This value also is used to determinate the number of used band in the hybrid filterbank. 'subband_tab' array contains 33 values of MDCT spec line positions started from 0 line and used to map subband number in to the range of mdct lines. Since the subband_num returned by decode_spectrum actually is number – 1 and subband_tab started from 0 we need to add 1 to make num_bands calculation correct.