Encoding LICH and round trip tests

[m17rt] / m17core / src / encode.rs

diff --git a/m17core/src/encode.rs b/m17core/src/encode.rs
index 70fe012c6e07de03b1b1153d4d3771a88e8a1c18..0b79e98e8425b1a535bf5c2d7da12f59f50fc89b 100644 (file)
--- a/m17core/src/encode.rs
+++ b/m17core/src/encode.rs
@@ -1,3 +1,122 @@
-use crate::protocol::LsfFrame;
+use crate::{
+    bits::Bits,
+    fec::{self, p_1},
+    interleave::interleave,
+    protocol::{LsfFrame, PacketFrame, StreamFrame, LSF_SYNC},
+    random::random_xor,
+};

 
 

-pub(crate) fn encode_lsf(frame: &LsfFrame) {}
+pub(crate) fn encode_lsf(frame: &LsfFrame) -> [f32; 192] {
+    let type3 = fec::encode(&frame.0, 240, p_1);
+    let mut interleaved = interleave(&type3);
+    random_xor(&mut interleaved);
+    let mut out = [0f32; 192];
+    for (val, o) in LSF_SYNC.iter().zip(out.iter_mut()) {
+        *o = *val as f32;
+    }
+    let bits = Bits::new(&interleaved);
+    let mut out_bits = bits.iter();
+    for o in out[8..].iter_mut() {
+        *o = match (out_bits.next().unwrap(), out_bits.next().unwrap()) {
+            (0, 1) => 1.0,
+            (0, 0) => 1.0 / 3.0,
+            (1, 0) => -1.0 / 3.0,
+            (1, 1) => -1.0,
+            _ => unreachable!(),
+        };
+    }
+    out
+}
+
+/*pub(crate) fn encode_stream(frame: &StreamFrame) -> [f32; 192] {
+    let type3 = fec::encode(&frame.0, 240, p_1);
+    let mut interleaved = interleave(&type3);
+    random_xor(&mut interleaved);
+    let mut out = [0f32; 192];
+    for (val, o) in LSF_SYNC.iter().zip(out.iter_mut()) {
+        *o = *val as f32;
+    }
+    let bits = Bits::new(&interleaved);
+    let mut out_bits = bits.iter();
+    for o in out[8..].iter_mut() {
+        *o = match (out_bits.next().unwrap(), out_bits.next().unwrap()) {
+            (0, 1) => 1.0,
+            (0, 0) => 1.0 / 3.0,
+            (1, 0) => -1.0 / 3.0,
+            (1, 1) => -1.0,
+            _ => unreachable!(),
+        };
+    }
+    out
+}*/
+
+/*pub(crate) fn encode_packet(frame: &PacketFrame) -> [f32; 192] {
+    let type3 = fec::encode(&frame.0, 240, p_1);
+    let mut interleaved = interleave(&type3);
+    random_xor(&mut interleaved);
+    let mut out = [0f32; 192];
+    for (val, o) in LSF_SYNC.iter().zip(out.iter_mut()) {
+        *o = *val as f32;
+    }
+    let bits = Bits::new(&interleaved);
+    let mut out_bits = bits.iter();
+    for o in out[8..].iter_mut() {
+        *o = match (out_bits.next().unwrap(), out_bits.next().unwrap()) {
+            (0, 1) => 1.0,
+            (0, 0) => 1.0 / 3.0,
+            (1, 0) => -1.0 / 3.0,
+            (1, 1) => -1.0,
+            _ => unreachable!(),
+        };
+    }
+    out
+}*/
+
+pub(crate) fn encode_lich(counter: u8, part: [u8; 5]) -> [u8; 12] {
+    let mut out = [0u8; 12];
+    let to_encode = [
+        ((part[0] as u16) << 4) | ((part[1] as u16) >> 4),
+        ((part[1] as u16 & 0x000f) << 8) | part[2] as u16,
+        ((part[3] as u16) << 4) | ((part[4] as u16) >> 4),
+        ((part[4] as u16 & 0x000f) << 8) | ((counter as u16) << 5),
+    ];
+    for (i, o) in to_encode.into_iter().zip(out.chunks_mut(3)) {
+        let encoded = cai_golay::extended::encode(i).to_be_bytes();
+        o[0..3].copy_from_slice(&encoded[1..4]);
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn lsf_round_trip() {
+        let lsf = LsfFrame([
+            255, 255, 255, 255, 255, 255, 0, 0, 0, 159, 221, 81, 5, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 131, 53,
+        ]);
+        let encoded = encode_lsf(&lsf);
+        let decoded = crate::decode::parse_lsf(&encoded);
+        assert_eq!(decoded, Some(lsf));
+    }
+
+    #[test]
+    fn lich_encode() {
+        let input = [221, 81, 5, 5, 0];
+        let counter = 2;
+        let expected_output = [221, 82, 162, 16, 85, 200, 5, 14, 254, 4, 13, 153];
+        assert_eq!(encode_lich(counter, input), expected_output);
+    }
+
+    #[test]
+    fn lich_round_trip() {
+        let input = [1, 255, 0, 90, 10];
+        let counter = 0;
+        assert_eq!(
+            crate::decode::decode_lich(&encode_lich(counter, input.clone())),
+            Some((counter, input))
+        );
+    }
+}