lc3_codec/decoder/
side_info.rs

1#[derive(Debug, Clone, Copy, PartialEq, Eq)]
2pub enum Bandwidth {
3    /// 0 - Narrow Band (4khz audio bandwidth)
4    NarrowBand = 0,
5
6    /// 1 - Wide Band (8khz audio bandwidth)
7    WideBand = 1,
8
9    /// 2 - Semi Super Wide Band (12khz audio bandwidth)
10    SemiSuperWideBand = 2,
11
12    /// 3 - Super Wide Band (16khz audio bandwidth)
13    SuperWideBand = 3,
14
15    /// 4 - Full Band (20khz audio bandwidth)
16    FullBand = 4,
17}
18
19#[derive(Debug)]
20pub struct SideInfo {
21    // in the order in which they are decoded
22    pub bandwidth: Bandwidth,                     // bandwidth cutoff index (P_BW)
23    pub lastnz: usize,                            // last non-zero tupple
24    pub lsb_mode: bool,                           // lsb mode bit (least significant bit)
25    pub global_gain_index: usize,                 // global gain index (gg_ind or gg_idx)
26    pub num_tns_filters: usize,                   // number of temporal noise shaping (tns) filters
27    pub reflect_coef_order_ari_input: [usize; 2], // Intermediate order of quantized reflection coefficients used as input to the arithmetic decoder (further information is extracted there)
28    pub sns_vq: SnsVq,
29    pub long_term_post_filter_info: LongTermPostFilterInfo,
30    pub noise_factor: usize, // noise level - noise factor (f_nf)
31}
32
33#[derive(Debug, Clone, Copy)]
34pub struct LongTermPostFilterInfo {
35    pub pitch_present: bool, // pitch present flag
36    // only set if pitch_present = true
37    pub is_active: bool,    // is long-term post filter active
38    pub pitch_index: usize, // long-term post filter pitch index (lookup for the pitch lag)
39}
40
41impl LongTermPostFilterInfo {
42    pub fn new(is_active: bool, pitch_present: bool, pitch_index: usize) -> Self {
43        Self {
44            is_active,
45            pitch_present,
46            pitch_index,
47        }
48    }
49}
50
51#[derive(Debug)]
52pub struct SnsVq {
53    pub ind_lf: usize,
54    pub ind_hf: usize,
55    pub ls_inda: usize,
56    pub ls_indb: usize,
57    pub idx_a: usize,
58    pub idx_b: usize,
59    pub submode_lsb: u8,
60    pub submode_msb: u8,
61    pub g_ind: usize,
62}
lc3_codec/decoder/side_info.rs

lc3_codec/decoder/
side_info.rs
