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use nihav_core::codecs::*;
use nihav_core::io::byteio::*;
use nihav_codec_support::codecs::imaadpcm::*;
use std::str::FromStr;
struct IMAADPCMDecoder {
ainfo: NAAudioInfo,
chmap: NAChannelMap,
ch_state: [IMAState; 2],
block_len: usize,
}
impl IMAADPCMDecoder {
fn new() -> Self {
Self {
ainfo: NAAudioInfo::new(0, 1, SND_S16P_FORMAT, 0),
chmap: NAChannelMap::new(),
ch_state: [IMAState::new(), IMAState::new()],
block_len: 0,
}
}
}
impl NADecoder for IMAADPCMDecoder {
fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
self.block_len = ainfo.get_block_len();
let channels = ainfo.get_channels() as usize;
validate!(channels == 2 || channels == 1);
validate!(self.block_len >= 8 * channels);
validate!((self.block_len & 3) == 0);
let len = (self.block_len / channels - 4) * 2 + 1;
self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), channels as u8, 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();
let channels = self.chmap.num_channels();
validate!(pktbuf.len() >= 8 * channels);
let nsamples = (pktbuf.len() / channels - 4) * 2 + 1;
let abuf = alloc_audio_buffer(self.ainfo, nsamples, self.chmap.clone())?;
let mut adata = abuf.get_abuf_i16().unwrap();
let mut off = [adata.get_offset(0), adata.get_offset(1)];
let dst = adata.get_data_mut().unwrap();
let mut mr = MemoryReader::new_read(pktbuf.as_slice());
let mut br = ByteReader::new(&mut mr);
for ch in 0..channels {
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);
dst[off[ch]] = pred;
off[ch] += 1;
}
while br.left() > 0 {
for ch in 0..channels {
let mut cw = br.read_u32le()?;
for _ in 0..8 {
dst[off[ch]] = self.ch_state[ch].expand_sample((cw & 0xF) as u8);
off[ch] += 1;
cw >>= 4;
}
}
}
let mut frm = NAFrame::new_from_pkt(pkt, info.replace_info(NACodecTypeInfo::Audio(self.ainfo)), abuf);
frm.set_duration(Some(nsamples as u64));
frm.set_keyframe(false);
Ok(frm.into_ref())
} else {
Err(DecoderError::InvalidData)
}
}
fn flush(&mut self) {
}
}
impl NAOptionHandler for IMAADPCMDecoder {
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(IMAADPCMDecoder::new())
}
#[cfg(test)]
mod test {
use nihav_core::codecs::RegisteredDecoders;
use nihav_core::demuxers::RegisteredDemuxers;
use nihav_codec_support::test::dec_video::*;
use crate::ms_register_all_decoders;
use nihav_commonfmt::generic_register_all_demuxers;
#[test]
fn test_ima_adpcm_ms() {
let mut dmx_reg = RegisteredDemuxers::new();
generic_register_all_demuxers(&mut dmx_reg);
let mut dec_reg = RegisteredDecoders::new();
ms_register_all_decoders(&mut dec_reg);
// sample: https://samples.mplayerhq.hu/A-codecs/ima-adpcm/ima-adpcm-stutter/IMAG0006.AVI
test_decoding("avi", "ima-adpcm-ms", "assets/MS/IMAG0006.AVI", None, &dmx_reg, &dec_reg,
ExpectedTestResult::MD5([0x0cdc640f, 0xb00df235, 0x1ec4a280, 0x065b5e9e]));
}
}
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