use ironrdp_pdu::codecs::rfx::Quant; const FIRST_LEVEL_SIZE: usize = 1024; const SECOND_LEVEL_SIZE: usize = 256; const THIRD_LEVEL_SIZE: usize = 64; const FIRST_LEVEL_SUBBANDS_COUNT: usize = 3; const SECOND_LEVEL_SUBBANDS_COUNT: usize = 3; pub fn decode(buffer: &mut [i16], quant: &Quant) { let (first_level, buffer) = buffer.split_at_mut(FIRST_LEVEL_SUBBANDS_COUNT * FIRST_LEVEL_SIZE); let (second_level, third_level) = buffer.split_at_mut(SECOND_LEVEL_SUBBANDS_COUNT * SECOND_LEVEL_SIZE); let decode_chunk = |a: (&mut [i16], u8)| decode_block(a.0, a.1 as i16 - 1); first_level .chunks_mut(FIRST_LEVEL_SIZE) .zip([quant.hl1, quant.lh1, quant.hh1].iter().copied()) .for_each(decode_chunk); second_level .chunks_mut(SECOND_LEVEL_SIZE) .zip([quant.hl2, quant.lh2, quant.hh2].iter().copied()) .for_each(decode_chunk); third_level .chunks_mut(THIRD_LEVEL_SIZE) .zip([quant.hl3, quant.lh3, quant.hh3, quant.ll3].iter().copied()) .for_each(decode_chunk); } fn decode_block(buffer: &mut [i16], factor: i16) { if factor > 0 { for value in buffer { *value <<= factor; } } } #[cfg(test)] mod tests { use super::*; #[test] fn decode_does_not_change_buffer_with_null_quant_values() { let mut buffer = QUANTIZED_BUFFER; let expected = QUANTIZED_BUFFER; let quant = Quant { ll3: 0, lh3: 0, hl3: 0, hh3: 0, lh2: 0, hl2: 0, hh2: 0, lh1: 0, hl1: 0, hh1: 0, }; decode(&mut buffer, &quant); assert_eq!(expected.as_ref(), buffer.as_ref()); } #[test] fn decode_works_with_not_empty_quant_values() { let mut buffer = QUANTIZED_BUFFER; let expected = DEQUANTIZED_BUFFER.as_ref(); let quant = Quant { ll3: 6, lh3: 6, hl3: 6, hh3: 6, lh2: 7, hl2: 7, hh2: 8, lh1: 8, hl1: 8, hh1: 9, }; decode(&mut buffer, &quant); assert_eq!(expected, buffer.as_ref()); } const QUANTIZED_BUFFER: [i16; 4096] = [ 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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