+use nihav_core::codecs::*;
+use nihav_codec_support::codecs::imaadpcm::*;
+use std::str::FromStr;
+
+struct IotaSoundDecoder {
+ ainfo: NAAudioInfo,
+ chmap: NAChannelMap,
+ ch_state: [IMAState; 2],
+}
+
+impl IotaSoundDecoder {
+ fn new() -> Self {
+ Self {
+ ainfo: NAAudioInfo::new(8000, 1, SND_S16P_FORMAT, 0),
+ chmap: NAChannelMap::new(),
+ ch_state: [IMAState::new(), IMAState::new()],
+ }
+ }
+}
+
+impl NADecoder for IotaSoundDecoder {
+ fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
+ if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
+ let channels = ainfo.get_channels();
+ validate!(channels == 1 || channels == 2);
+ self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), channels, SND_S16_FORMAT, 2);
+ 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.ainfo.get_channels();
+ let nsamples = pktbuf.len() * 2 / usize::from(channels);
+ let abuf = alloc_audio_buffer(self.ainfo, nsamples, self.chmap.clone())?;
+ let mut adata = abuf.get_abuf_i16().unwrap();
+ let dst = adata.get_data_mut().unwrap();
+ let idx2 = if channels == 1 { 0 } else { 1 };
+ for (dpair, &src) in dst.chunks_exact_mut(2).zip(pktbuf.iter()) {
+ dpair[0] = self.ch_state[0].expand_sample(src >> 4);
+ dpair[1] = self.ch_state[idx2].expand_sample(src & 0xF);
+ }
+
+ let mut frm = NAFrame::new_from_pkt(pkt, info, abuf);
+ frm.set_duration(Some(nsamples as u64));
+ frm.set_keyframe(false);
+ Ok(frm.into_ref())
+ } else {
+ Err(DecoderError::InvalidData)
+ }
+ }
+ fn flush(&mut self) {
+ self.ch_state[0].reset(0, 0);
+ self.ch_state[1].reset(0, 0);
+ }
+}
+
+impl NAOptionHandler for IotaSoundDecoder {
+ 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(IotaSoundDecoder::new())
+}
+
+#[cfg(test)]
+mod test {
+ use nihav_core::codecs::{RegisteredDecoders, RegisteredPacketisers};
+ use nihav_core::demuxers::RegisteredRawDemuxers;
+ use nihav_codec_support::test::dec_video::*;
+ use crate::*;
+ #[test]
+ fn test_iota_sound() {
+ let mut dmx_reg = RegisteredRawDemuxers::new();
+ acorn_register_all_raw_demuxers(&mut dmx_reg);
+ let mut pkt_reg = RegisteredPacketisers::new();
+ acorn_register_all_packetisers(&mut pkt_reg);
+ let mut dec_reg = RegisteredDecoders::new();
+ acorn_register_all_decoders(&mut dec_reg);
+
+ // sample from All About Planes
+ test_decoding_raw("armovie", "iota-sound", "assets/Acorn/wessex", None,
+ &dmx_reg, &pkt_reg, &dec_reg,
+ ExpectedTestResult::MD5([0x19509699, 0x0a2134c9, 0xef46040e, 0xa4ccd672]));
+ }
+}
projects / nihav.git / commitdiff