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|
use nihav_core::codecs::*;
use nihav_core::io::bitreader::*;
use nihav_codec_support::dsp::qmf::QMF;
use std::str::FromStr;
use std::sync::Arc;
const CODEC_SAMPLES: usize = 1152;
struct LHDecoder {
ainfo: NAAudioInfo,
info: Arc<NACodecInfo>,
chmap: NAChannelMap,
bitalloc: [[u8; 32]; 3],
scf_select: [u8; 32],
scales: [[u8; 32]; 3],
samples: [[f32; 32]; 36],
bitpos: u32,
qmf: QMF,
}
impl LHDecoder {
fn new() -> Self {
Self {
ainfo: NAAudioInfo::new(22050, 1, SND_F32P_FORMAT, CODEC_SAMPLES),
info: NACodecInfo::new_dummy(),
chmap: NAChannelMap::new(),
bitalloc: [[0; 32]; 3],
scf_select: [0; 32],
scales: [[0; 32]; 3],
samples: [[0.0; 32]; 36],
bitpos: 0,
qmf: QMF::new(),
}
}
fn unpack_bitalloc(&mut self, br: &mut BitReader) -> DecoderResult<()> {
for i in 0..3 {
for sb in 0..32 {
self.bitalloc[i][sb] = br.read(BITALLOC_INFO[sb])? as u8;
}
}
Ok(())
}
fn unpack_scales(&mut self, br: &mut BitReader) -> DecoderResult<()> {
for sb in 0..32 {
if (self.bitalloc[0][sb] | self.bitalloc[1][sb] | self.bitalloc[2][sb]) != 0 {
self.scf_select[sb] = br.read(2)? as u8;
} else {
self.scf_select[sb] = 0;
}
}
self.scales = [[0; 32]; 3];
for sb in 0..32 {
let ba0 = self.bitalloc[0][sb];
let ba1 = self.bitalloc[1][sb];
let ba2 = self.bitalloc[2][sb];
if (ba0 | ba1 | ba2) == 0 {
continue;
}
match self.scf_select[sb] {
0 => {
for j in 0..3 {
if self.bitalloc[j][sb] != 0 {
self.scales[j][sb] = br.read(6)? as u8;
}
}
},
1 => {
if (ba0 | ba1) != 0 {
let scale = br.read(6)? as u8;
self.scales[0][sb] = scale;
self.scales[1][sb] = scale;
}
if ba2 != 0 {
self.scales[2][sb] = br.read(6)? as u8;
}
},
2 => {
let scale = br.read(6)? as u8;
self.scales[0][sb] = scale;
self.scales[1][sb] = scale;
self.scales[2][sb] = scale;
},
_ => {
if ba0 != 0 {
self.scales[0][sb] = br.read(6)? as u8;
}
if (ba1 | ba2) != 0 {
let scale = br.read(6)? as u8;
self.scales[1][sb] = scale;
self.scales[2][sb] = scale;
}
},
};
}
Ok(())
}
#[allow(clippy::identity_op)]
fn unpack_samples(&mut self, br: &mut BitReader) -> DecoderResult<()> {
for grp in 0..3 {
for gr in 0..4 {
for sb in 0..32 {
let set = (grp * 4 + gr) * 3;
if self.bitalloc[grp][sb] == 0 {
self.samples[set + 0][sb] = 0.0;
self.samples[set + 1][sb] = 0.0;
self.samples[set + 2][sb] = 0.0;
continue;
}
let idx = sb * 4 + (self.bitalloc[grp][sb] as usize);
let bits = GROUP_BITS[idx];
let sf = SCALEFACTORS[self.scales[grp][sb] as usize];
if GROUP_INFO[idx] == 1 {
let radix = (1 << bits) - 1;
let val0 = br.read(bits)? as usize;
let val1 = br.read(bits)? as usize;
let val2 = br.read(bits)? as usize;
self.samples[set + 0][sb] = Self::dequant(val0, idx, radix) * sf;
self.samples[set + 1][sb] = Self::dequant(val1, idx, radix) * sf;
self.samples[set + 2][sb] = Self::dequant(val2, idx, radix) * sf;
} else {
let radix = GROUP_RADIX[idx] as usize;
let val = br.read(bits)? as usize;
let val0 = val % radix;
let val1 = (val / radix) % radix;
let val2 = val / radix / radix;
self.samples[set + 0][sb] = Self::dequant(val0, idx, radix) * sf;
self.samples[set + 1][sb] = Self::dequant(val1, idx, radix) * sf;
self.samples[set + 2][sb] = Self::dequant(val2, idx, radix) * sf;
}
}
}
}
Ok(())
}
fn dequant(val: usize, idx: usize, radix: usize) -> f32 {
let qval = match radix {
3 => QUANTS3[val],
5 => QUANTS5[val],
7 => QUANTS7[val],
15 => QUANTS15[val],
63 => QUANTS63[val],
_ => unreachable!(),
};
let bias_idx = QUANT_BIAS_MAP[idx] as usize;
(qval + QUANT_BIAS[bias_idx]) / QUANT_RANGE[bias_idx]
}
}
impl NADecoder for LHDecoder {
fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), 1, SND_F32P_FORMAT, CODEC_SAMPLES);
self.info = info.replace_info(NACodecTypeInfo::Audio(self.ainfo));
self.chmap = NAChannelMap::from_str("C").unwrap();
Ok(())
} else {
Err(DecoderError::InvalidData)
}
}
fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
let info = pkt.get_stream().get_info();
if let NACodecTypeInfo::Audio(_) = info.get_properties() {
let pktbuf = pkt.get_buffer();
let mut daudio = Vec::with_capacity(CODEC_SAMPLES);
let mut br = BitReader::new(pktbuf.as_slice(), BitReaderMode::BE);
br.skip(self.bitpos)?;
while br.left() >= 8 {
self.unpack_bitalloc(&mut br)?;
self.unpack_scales(&mut br)?;
self.unpack_samples(&mut br)?;
let mut samp_buf = [0.0f32; 32];
for set in 0..36 {
self.qmf.synth(&self.samples[set], &mut samp_buf);
daudio.extend_from_slice(&samp_buf);
}
}
self.bitpos = (br.tell() as u32) & 7;
let abuf = alloc_audio_buffer(self.ainfo, daudio.len(), self.chmap.clone())?;
let mut adata = abuf.get_abuf_f32().unwrap();
let buf = adata.get_data_mut().unwrap();
(&mut buf[..daudio.len()]).copy_from_slice(daudio.as_slice());
let mut frm = NAFrame::new_from_pkt(pkt, self.info.clone(), abuf);
frm.set_duration(Some(CODEC_SAMPLES as u64));
frm.set_keyframe(true);
Ok(frm.into_ref())
} else {
Err(DecoderError::Bug)
}
}
fn flush(&mut self) {
self.qmf = QMF::new();
self.bitpos = 0;
}
}
impl NAOptionHandler for LHDecoder {
fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
fn set_options(&mut self, _options: &[NAOption]) { }
fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
}
pub fn get_decoder() -> Box<dyn NADecoder + Send> {
Box::new(LHDecoder::new())
}
const BITALLOC_INFO: [u8; 32] = [
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
];
const GROUP_BITS: [u8; 128] = [
0, 3, 4, 6, 0, 3, 4, 6, 0, 3, 4, 6, 0, 3, 4, 6,
0, 3, 4, 6, 0, 3, 4, 6, 0, 5, 7, 4, 0, 5, 7, 4,
0, 5, 7, 4, 0, 5, 7, 4, 0, 5, 7, 4, 0, 5, 7, 4,
0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0,
0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0,
0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0,
0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0,
0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0
];
const GROUP_INFO: [u8; 128] = [
0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1,
0, 1, 1, 1, 0, 1, 1, 1, 0, 3, 3, 1, 0, 3, 3, 1,
0, 3, 3, 1, 0, 3, 3, 1, 0, 3, 3, 1, 0, 3, 3, 1,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0
];
const GROUP_RADIX: [u8; 128] = [
0, 7, 15, 63, 0, 7, 15, 63, 0, 7, 15, 63, 0, 7, 15, 63,
0, 7, 15, 63, 0, 7, 15, 63, 0, 3, 5, 15, 0, 3, 5, 15,
0, 3, 5, 15, 0, 3, 5, 15, 0, 3, 5, 15, 0, 3, 5, 15,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0,
0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0
];
const QUANT_BIAS_MAP: [u8; 128] = [
0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6,
0, 2, 4, 6, 0, 2, 4, 6, 0, 0, 1, 4, 0, 0, 1, 4,
0, 0, 1, 4, 0, 0, 1, 4, 0, 0, 1, 4, 0, 0, 1, 4,
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, 0, 0, 0, 0, 0
];
const QUANT_BIAS: [f32; 17] = [
0.5, 0.5, 0.25, 0.5, 0.125, 0.0625, 0.03125, 0.015625,
0.0078125, 0.00390625, 0.001953125, 0.0009765625, 0.00048828125,
0.00024414062, 0.00012207031, 0.000061035164, 0.000030517582
];
const QUANT_RANGE: [f32; 17] = [
0.75, 0.625, 0.875, 0.5625, 0.9375, 0.96875, 0.984375,
0.9921875, 0.99609375, 0.99804688, 0.99902344, 0.99951172,
0.99975586, 0.99987793, 0.99993896, 0.99996948, 0.99998474
];
const SCALEFACTORS: [f32; 64] = [
2.0, 1.587401, 1.2599211, 1.0, 0.79370052, 0.62996054,
0.5, 0.39685026, 0.31498027, 0.25, 0.19842513, 0.15749013,
0.125, 0.099212565, 0.078745067, 0.0625, 0.049606282, 0.039372534,
0.03125, 0.024803141, 0.019686267, 0.015625, 0.012401571, 0.0098431334,
0.0078125, 0.0062007853, 0.0049215667, 0.00390625, 0.0031003926, 0.0024607833,
0.001953125, 0.0015501963, 0.0012303917, 0.0009765625, 0.00077509816, 0.00061519584,
0.00048828125, 0.00038754908, 0.00030759792, 0.00024414062, 0.00019377454, 0.00015379896,
0.00012207031, 0.00009688727, 0.00007689948, 0.000061035156,
0.000048443635, 0.00003844974, 0.000030517578, 0.000024221818,
0.00001922487, 0.000015258789, 0.000012110909, 0.000009612435,
0.0000076293945, 0.0000060554544, 0.0000048062175, 0.0000038146973,
0.0000030277272, 0.0000024031087, 0.0000019073486, 0.0000015138636,
0.0000012015544, 9.9999997e-21
];
const QUANTS3: [f32; 4] = [ -1.0, -0.5, 0.0, 0.5 ];
const QUANTS5: [f32; 6] = [ -1.0, -0.75, -0.5, -0.25, 0.0, 0.25 ];
const QUANTS7: [f32; 8] = [ -1.0, -0.75, -0.5, -0.25, 0.0, 0.25, 0.5, 0.75 ];
const QUANTS15: [f32; 16] = [
-1.0, -0.875, -0.75, -0.625, -0.5, -0.375, -0.25, -0.125,
0.0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875 ];
const QUANTS63: [f32; 64] = [
-1.0, -0.96875, -0.9375, -0.90625, -0.875, -0.84375, -0.8125, -0.78125,
-0.75, -0.71875, -0.6875, -0.65625, -0.625, -0.59375, -0.5625, -0.53125,
-0.5, -0.46875, -0.4375, -0.40625, -0.375, -0.34375, -0.3125, -0.28125,
-0.25, -0.21875, -0.1875, -0.15625, -0.125, -0.09375, -0.0625, -0.03125,
0.0, 0.03125, 0.0625, 0.09375, 0.125, 0.15625, 0.1875, 0.21875,
0.25, 0.28125, 0.3125, 0.34375, 0.375, 0.40625, 0.4375, 0.46875,
0.5, 0.53125, 0.5625, 0.59375, 0.625, 0.65625, 0.6875, 0.71875,
0.75, 0.78125, 0.8125, 0.84375, 0.875, 0.90625, 0.9375, 0.96875 ];
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