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use nihav_core::codecs::*;
use nihav_core::io::byteio::*;
use std::str::FromStr;
const IMA_MAX_STEP: u8 = 88;
struct IMAState {
predictor: i32,
step: usize,
}
impl IMAState {
fn new() -> Self {
Self {
predictor: 0,
step: 0,
}
}
fn reset(&mut self, predictor: i16, step: u8) {
self.predictor = i32::from(predictor);
self.step = step.min(IMA_MAX_STEP) as usize;
}
fn expand_sample(&mut self, nibble: u8) -> i16 {
let istep = (self.step as isize) + (IMA_STEPS[nibble as usize] as isize);
let sign = (nibble & 8) != 0;
let diff = (i32::from(2 * (nibble & 7) + 1) * IMA_STEP_TABLE[self.step]) >> 3;
let sample = if !sign { self.predictor + diff } else { self.predictor - diff };
self.predictor = sample.max(i32::from(std::i16::MIN)).min(i32::from(std::i16::MAX));
self.step = istep.max(0).min(IMA_MAX_STEP as isize) as usize;
self.predictor as i16
}
}
struct DuckADPCMDecoder {
ainfo: NAAudioInfo,
chmap: NAChannelMap,
is_dk3: bool,
ch_state: [IMAState; 2],
block_len: usize,
}
impl DuckADPCMDecoder {
fn new(is_dk3: bool) -> Self {
Self {
ainfo: NAAudioInfo::new(0, 1, SND_S16P_FORMAT, 0),
chmap: NAChannelMap::new(),
is_dk3,
ch_state: [IMAState::new(), IMAState::new()],
block_len: 0,
}
}
}
impl NADecoder for DuckADPCMDecoder {
fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
validate!(ainfo.get_block_len() > 16);
self.block_len = ainfo.get_block_len();
let channels = ainfo.get_channels();
validate!(channels == 2 || (!self.is_dk3 && channels == 1));
let len = if self.is_dk3 {
((self.block_len - 16) * 2 / 3) * 2
} else {
(self.block_len - 4 * (channels as usize)) * 2 / (channels as usize)
};
self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), channels, SND_S16P_FORMAT, len);
self.chmap = NAChannelMap::from_str(if channels == 1 { "C" } else { "L,R" }).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();
validate!(pktbuf.len() > (if self.is_dk3 { 16 } else { 4 * self.chmap.num_channels() }));
let nblocks = pktbuf.len() / self.block_len;
let out_block_len = self.ainfo.get_block_len();
let duration = out_block_len * nblocks;
let abuf = alloc_audio_buffer(self.ainfo, duration, self.chmap.clone())?;
let mut adata = abuf.get_abuf_i16().unwrap();
let mut off0 = adata.get_offset(0);
let mut off1 = adata.get_offset(1);
let dst = adata.get_data_mut().unwrap();
for blk in pktbuf.chunks_exact(self.block_len) {
let mut mr = MemoryReader::new_read(blk);
let mut br = ByteReader::new(&mut mr);
if self.is_dk3 {
let _typeid = br.read_byte()?;
let _version = br.read_byte()?;
let _srate = br.read_u32le()?;
let samples = br.read_u32le()? as usize;
let sumpred = br.read_u16le()? as i16;
let diffpred = br.read_u16le()? as i16;
let sumstep = br.read_byte()?;
let diffstep = br.read_byte()?;
validate!(sumstep <= IMA_MAX_STEP && diffstep <= IMA_MAX_STEP);
validate!(samples <= out_block_len);
self.ch_state[0].reset(sumpred, sumstep);
self.ch_state[1].reset(diffpred, diffstep);
let mut last_nib = 0;
let mut diff_val: i32 = i32::from(diffpred);
for x in (0..out_block_len).step_by(2) {
let nib0;
let nib1;
let nib2;
if (x & 2) == 0 {
let b0 = br.read_byte()?;
let b1 = br.read_byte()?;
nib0 = b0 & 0xF;
nib1 = b0 >> 4;
nib2 = b1 & 0xF;
last_nib = b1 >> 4;
} else {
let b0 = br.read_byte()?;
nib0 = last_nib;
nib1 = b0 & 0xF;
nib2 = b0 >> 4;
}
let sum0 = i32::from(self.ch_state[0].expand_sample(nib0));
let diff = i32::from(self.ch_state[1].expand_sample(nib1));
let sum1 = i32::from(self.ch_state[0].expand_sample(nib2));
diff_val = (diff_val + diff) >> 1;
dst[off0 + x + 0] = (sum0 + diff_val) as i16;
dst[off1 + x + 0] = (sum0 - diff_val) as i16;
diff_val = (diff_val + diff) >> 1;
dst[off0 + x + 1] = (sum1 + diff_val) as i16;
dst[off1 + x + 1] = (sum1 - diff_val) as i16;
diff_val = diff;
}
} else {
let nchannels = self.chmap.num_channels();
for ch in 0..nchannels {
let pred = br.read_u16le()? as i16;
let step = br.read_byte()?;
br.read_skip(1)?;
validate!(step <= IMA_MAX_STEP);
self.ch_state[ch].reset(pred, step);
}
if nchannels == 2 {
for x in 0..out_block_len {
let b = br.read_byte()?;
dst[off0 + x] = self.ch_state[0].expand_sample(b >> 4);
dst[off1 + x] = self.ch_state[1].expand_sample(b & 0xF);
}
} else {
for x in (0..out_block_len).step_by(2) {
let b = br.read_byte()?;
dst[off0 + x + 0] = self.ch_state[0].expand_sample(b >> 4);
dst[off0 + x + 1] = self.ch_state[0].expand_sample(b & 0xF);
}
}
}
off0 += out_block_len;
off1 += out_block_len;
}
let mut frm = NAFrame::new_from_pkt(pkt, info, abuf);
frm.set_duration(Some(duration as u64));
frm.set_keyframe(false);
Ok(frm.into_ref())
} else {
Err(DecoderError::InvalidData)
}
}
fn flush(&mut self) {
}
}
pub fn get_decoder_dk3() -> Box<dyn NADecoder + Send> {
Box::new(DuckADPCMDecoder::new(true))
}
pub fn get_decoder_dk4() -> Box<dyn NADecoder + Send> {
Box::new(DuckADPCMDecoder::new(false))
}
#[cfg(test)]
mod test {
use nihav_core::codecs::RegisteredDecoders;
use nihav_core::demuxers::RegisteredDemuxers;
use nihav_codec_support::test::dec_video::*;
use crate::duck_register_all_codecs;
use nihav_commonfmt::generic_register_all_demuxers;
#[test]
fn test_dk3() {
let mut dmx_reg = RegisteredDemuxers::new();
generic_register_all_demuxers(&mut dmx_reg);
let mut dec_reg = RegisteredDecoders::new();
duck_register_all_codecs(&mut dec_reg);
//let file = "assets/Duck/AVI-DUCK-dk3.duk";
//test_decode_audio("avi", file, Some(100), None/*Some("dk3")*/, &dmx_reg, &dec_reg);
test_decoding("avi", "adpcm-dk3", "assets/Duck/AVI-DUCK-dk3.duk", None, &dmx_reg, &dec_reg,
ExpectedTestResult::MD5([0xa48fae0a, 0xa536b27f, 0x169ecc19, 0x8436fade]));
}
#[test]
fn test_dk4() {
let mut dmx_reg = RegisteredDemuxers::new();
generic_register_all_demuxers(&mut dmx_reg);
let mut dec_reg = RegisteredDecoders::new();
duck_register_all_codecs(&mut dec_reg);
// let file = "assets/Duck/virtuafighter2-opening1.avi";
// test_decode_audio("avi", file, Some(100), None/*Some("dk4")*/, &dmx_reg, &dec_reg);
test_decoding("avi", "adpcm-dk4", "assets/Duck/virtuafighter2-opening1.avi", None, &dmx_reg, &dec_reg,
ExpectedTestResult::MD5([0x04e40d15, 0xf65b3427, 0x1dd5181f, 0xf321b56f]));
}
}
const IMA_STEPS: [i8; 16] = [
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
];
const IMA_STEP_TABLE: [i32; 89] = [
7, 8, 9, 10, 11, 12, 13, 14,
16, 17, 19, 21, 23, 25, 28, 31,
34, 37, 41, 45, 50, 55, 60, 66,
73, 80, 88, 97, 107, 118, 130, 143,
157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 876, 963, 1060, 1166, 1282, 1411,
1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
];
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