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mod header;
mod tables;
use range;
use common::types::Channels;
use common::types::FrameSize;
use self::header::HeaderFlagsStereo;
use self::header::HeaderFlagsMono;
pub struct Decoder<'a> {
rc: range::Decoder<'a>,
stereo: Stereo,
}
struct Stereo {
stereo_prediction_weights: (i32, i32),
}
impl<'a> Decoder<'a> {
pub fn new(rc: range::Decoder<'a>) -> Self {
Self {
rc,
stereo: Stereo {
stereo_prediction_weights: (0, 0),
}
}
}
pub fn decode_frame(&mut self, channels: Channels, frame_size: FrameSize) -> u16 {
debug_assert!(frame_size != FrameSize::Ms2_5 && frame_size != FrameSize::Ms5);
let (silkframe_count, subframe_count) = match frame_size {
FrameSize::Ms10 => (1, 2),
FrameSize::Ms20 => (1, 4),
FrameSize::Ms40 => (2, 4),
FrameSize::Ms60 => (3, 4),
_ => unreachable!(),
};
match channels {
Channels::Mono => {
let flags = header_flags_mono(&mut self.rc, silkframe_count);
},
Channels::Stereo => {
let flags = header_flags_stereo(&mut self.rc, silkframe_count);
self.decode_silkframe_stereo((flags.vad_mid[0], flags.vad_side[0]), true);
for i in 1..silkframe_count as usize {
self.decode_silkframe_stereo((flags.vad_mid[i], flags.vad_side[i]), false);
}
}
};
0
}
fn decode_silkframe_mono(&mut self, flags: HeaderFlagsMono) {
}
fn decode_silkframe_stereo(&mut self, activity: (bool, bool), first: bool) {
let stereo_weights = stereo_prediction_weights(&mut self.rc);
let mid_only = if activity.1 {
mid_only(&mut self.rc)
} else {
0
};
let frame_type = frame_type(&mut self.rc, activity.0);
}
}
fn stereo_prediction_weights(rc: &mut range::Decoder) -> (i32, i32) {
use self::tables::STEREO_WEIGHT_TABLE_PRECOMPUTE as w_Q13_precompute;
let n = rc.decode_icdf(&tables::icdf::STEREO_PREDICTION_WEIGHT.0, 8);
let (val, rem) = ::common::util::div_rem(n, 5);
let wi0 = rc.decode_icdf(&tables::icdf::STEREO_PREDICTION_WEIGHT.1, 8) + 3 * val;
let i1 = (rc.decode_icdf(&tables::icdf::STEREO_PREDICTION_WEIGHT.2, 8) * 2 + 1) as i32;
let wi1 = rc.decode_icdf(&tables::icdf::STEREO_PREDICTION_WEIGHT.1, 8) + 3 * rem;
let i3 = (rc.decode_icdf(&tables::icdf::STEREO_PREDICTION_WEIGHT.2, 8) * 2 + 1) as i32;
let w1_q13 = w_Q13_precompute[wi1] as i32 * i3;
let w0_q13 = w_Q13_precompute[wi0] as i32 * i1 - w1_q13;
(w0_q13, w1_q13)
}
fn mid_only(rc: &mut range::Decoder) -> usize {
rc.decode_icdf(&tables::icdf::MID_ONLY, 8)
}
struct FrameType {
signal: SignalType,
quant_offset: QuantizationOffset,
}
enum SignalType {
Inactive,
Unvoiced,
Voiced,
}
enum QuantizationOffset {
Low,
High
}
fn frame_type(rc: &mut range::Decoder, active: bool) -> FrameType {
let val = if active {
rc.decode_icdf(&tables::icdf::FRAME_TYPE.1, 8)
} else {
rc.decode_icdf(&tables::icdf::FRAME_TYPE.0, 8)
};
FrameType {
signal: match val>>1 {
0 => SignalType::Inactive,
1 => SignalType::Unvoiced,
2 => SignalType::Voiced,
_ => unreachable!()
},
quant_offset: if val & 1 == 1 { QuantizationOffset::High } else { QuantizationOffset::Low }
}
}
fn subframe_gain(rc: &mut range::Decoder, signal_type: SignalType, subframe_count: u8, prev_log_gain: Option<u8>, independant: bool) -> [u8; 4] {
let mut gain = [0u8; 4];
let mut log_gain = 0;
if independant {
let table = match signal_type {
SignalType::Inactive => &tables::icdf::SUBFRAME_GAIN.0,
SignalType::Unvoiced => &tables::icdf::SUBFRAME_GAIN.1,
SignalType::Voiced => &tables::icdf::SUBFRAME_GAIN.2,
};
log_gain = (rc.decode_icdf(table, 8) as u8)<<3;
log_gain += rc.decode_icdf(&tables::icdf::SUBFRAME_GAIN.3, 8) as u8;
if let Some(prev_log_gain) = prev_log_gain {
log_gain = log_gain.max(prev_log_gain - 16);
}
}
for val in &mut gain[1..subframe_count as usize] {
let delta_gain = rc.decode_icdf(&tables::icdf::SUBFRAME_GAIN_DELTA, 8) as u8;
log_gain = (2*delta_gain-16).max(log_gain + delta_gain - 4).min(63).max(0);
*val = unimplemented!()
}
gain
}
fn header_flags_mono(rc: &mut range::Decoder, subframe_count: u8) -> HeaderFlagsMono {
let mut flags = HeaderFlagsMono::default();
for i in 0..subframe_count as usize {
flags.vad_mid[i] = rc.decode_bit_logp(1);
}
if rc.decode_bit_logp(1) {
per_frame_lbrr_flags(rc, &mut flags.lbrr_mid, subframe_count);
}
flags
}
fn header_flags_stereo(rc: &mut range::Decoder, subframe_count: u8) -> HeaderFlagsStereo {
let mut flags = HeaderFlagsStereo::default();
for i in 0..subframe_count as usize {
flags.vad_mid[i] = rc.decode_bit_logp(1);
}
let lbrr_mid_flag = rc.decode_bit_logp(1);
for i in 0..subframe_count as usize {
flags.vad_side[i] = rc.decode_bit_logp(1);
}
let lbrr_side_flag = rc.decode_bit_logp(1);
if lbrr_mid_flag {
per_frame_lbrr_flags(rc, &mut flags.lbrr_mid, subframe_count);
}
if lbrr_side_flag {
per_frame_lbrr_flags(rc, &mut flags.lbrr_side, subframe_count);
}
flags
}
fn per_frame_lbrr_flags(rc: &mut range::Decoder, flags: &mut [bool; 3], subframe_count: u8) {
debug_assert!(subframe_count <= 3 && subframe_count > 0);
match subframe_count {
1 => flags[0] = true,
2 => {
let lbrr_symbol = rc.decode_icdf(&tables::icdf::LBRR_FLAGS.0, 8);
flags[0] = lbrr_symbol & 0b1 > 0;
flags[1] = lbrr_symbol & 0b10 > 0;
},
3 => {
let lbrr_symbol = rc.decode_icdf(&tables::icdf::LBRR_FLAGS.1, 8);
flags[0] = lbrr_symbol & 0b1 > 0;
flags[1] = lbrr_symbol & 0b10 > 0;
flags[2] = lbrr_symbol & 0b100 > 0;
},
_ => unreachable!(),
}
}