static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb, int channel, int *last) { int t, t2; int sign, base, add, ret; WvChannel *c = &ctx->ch[channel]; *last = 0; if((ctx->ch[0].median[0] < 2U) && (ctx->ch[1].median[0] < 2U) && !ctx->zero && !ctx->one){ if(ctx->zeroes){ ctx->zeroes--; if(ctx->zeroes){ c->slow_level -= LEVEL_DECAY(c->slow_level); return 0; } }else{ t = get_unary_0_33(gb); if(t >= 2) t = get_bits(gb, t - 1) | (1 << (t-1)); ctx->zeroes = t; if(ctx->zeroes){ memset(ctx->ch[0].median, 0, sizeof(ctx->ch[0].median)); memset(ctx->ch[1].median, 0, sizeof(ctx->ch[1].median)); c->slow_level -= LEVEL_DECAY(c->slow_level); return 0; } } } if(get_bits_count(gb) >= ctx->data_size){ *last = 1; return 0; } if(ctx->zero){ t = 0; ctx->zero = 0; }else{ t = get_unary_0_33(gb); if(get_bits_count(gb) >= ctx->data_size){ *last = 1; return 0; } if(t == 16) { t2 = get_unary_0_33(gb); if(t2 < 2) t += t2; else t += get_bits(gb, t2 - 1) | (1 << (t2 - 1)); } if(ctx->one){ ctx->one = t&1; t = (t>>1) + 1; }else{ ctx->one = t&1; t >>= 1; } ctx->zero = !ctx->one; } if(ctx->hybrid && !channel) update_error_limit(ctx); if(!t){ base = 0; add = GET_MED(0) - 1; DEC_MED(0); }else if(t == 1){ base = GET_MED(0); add = GET_MED(1) - 1; INC_MED(0); DEC_MED(1); }else if(t == 2){ base = GET_MED(0) + GET_MED(1); add = GET_MED(2) - 1; INC_MED(0); INC_MED(1); DEC_MED(2); }else{ base = GET_MED(0) + GET_MED(1) + GET_MED(2) * (t - 2); add = GET_MED(2) - 1; INC_MED(0); INC_MED(1); INC_MED(2); } if(!c->error_limit){ ret = base + get_tail(gb, add); }else{ int mid = (base*2 + add + 1) >> 1; while(add > c->error_limit){ if(get_bits1(gb)){ add -= (mid - base); base = mid; }else add = mid - base - 1; mid = (base*2 + add + 1) >> 1; } ret = mid; } sign = get_bits1(gb); if(ctx->hybrid_bitrate) c->slow_level += wp_log2(ret) - LEVEL_DECAY(c->slow_level); return sign ? ~ret : ret; }