static inline void encode_vlc_codeword(PutBitContext *pb, unsigned codebook, int val) { unsigned int rice_order, exp_order, switch_bits, switch_val; int exponent; /* number of prefix bits to switch between Rice and expGolomb */ switch_bits = (codebook & 3) + 1; rice_order = codebook >> 5; /* rice code order */ exp_order = (codebook >> 2) & 7; /* exp golomb code order */ switch_val = switch_bits << rice_order; if (val >= switch_val) { val -= switch_val - (1 << exp_order); exponent = av_log2(val); put_bits(pb, exponent - exp_order + switch_bits, 0); put_bits(pb, 1, 1); put_bits(pb, exponent, val); } else { exponent = val >> rice_order; if (exponent) put_bits(pb, exponent, 0); put_bits(pb, 1, 1); if (rice_order) put_sbits(pb, rice_order, val); } }