[Mp4-tech] [MP-tech4 ] what is mean this following?

["이성용"]

Hello? 
At the JM decoder 10.2. 
i can see that there is read_significant_coefficients() function of cabac.c. 
Why? 
 coeff[i] += biari_decode_symbol (dep_dp, img->currentSlice->tex_ctx->one_contexts[type2ctx_one[type]] + ctx); 
So, i can't understand. 
Could somebody help me? 
Please 
regard.
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