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Use explicit table lookup for ac_q and dc_q #2667

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merged 2 commits into from
Feb 10, 2021
Merged

Use explicit table lookup for ac_q and dc_q #2667

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b5ce71a
Correct a misuse of pattern in ac_q and dc_q
barrbrain Feb 10, 2021
784aeab
Use explicit table lookup for ac_q and dc_q
barrbrain Feb 10, 2021
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24 changes: 8 additions & 16 deletions src/quantize.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,25 +32,17 @@ pub fn get_log_tx_scale(tx_size: TxSize) -> usize {
}

pub fn dc_q(qindex: u8, delta_q: i8, bit_depth: usize) -> i16 {
let &table = match bit_depth {
8 => &dc_qlookup_Q3,
10 => &dc_qlookup_10_Q3,
12 => &dc_qlookup_12_Q3,
_ => unimplemented!(),
};

table[(qindex as isize + delta_q as isize).max(0).min(255) as usize]
static DC_Q: [&[i16; 256]; 3] =
[&dc_qlookup_Q3, &dc_qlookup_10_Q3, &dc_qlookup_12_Q3];
let bd = ((bit_depth ^ 8) >> 1).min(2);
DC_Q[bd][((qindex as isize + delta_q as isize).max(0) as usize).min(255)]
}

pub fn ac_q(qindex: u8, delta_q: i8, bit_depth: usize) -> i16 {
let &table = match bit_depth {
8 => &ac_qlookup_Q3,
10 => &ac_qlookup_10_Q3,
12 => &ac_qlookup_12_Q3,
_ => unimplemented!(),
};

table[(qindex as isize + delta_q as isize).max(0).min(255) as usize]
static AC_Q: [&[i16; 256]; 3] =
[&ac_qlookup_Q3, &ac_qlookup_10_Q3, &ac_qlookup_12_Q3];
let bd = ((bit_depth ^ 8) >> 1).min(2);
AC_Q[bd][((qindex as isize + delta_q as isize).max(0) as usize).min(255)]
}

// TODO: Handle lossless properly.
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