1 use nihav_core::codecs::*;
2 use nihav_core::io::byteio::*;
3 use nihav_codec_support::codecs::imaadpcm::*;
6 const PACKET_LEN: usize = 34;
7 const PACKET_SAMPLES: usize = 64;
9 struct IMAADPCMDecoder {
12 ch_state: [IMAState; 2],
15 impl IMAADPCMDecoder {
18 ainfo: NAAudioInfo::new(0, 1, SND_S16P_FORMAT, PACKET_SAMPLES),
19 chmap: NAChannelMap::new(),
20 ch_state: [IMAState::new(), IMAState::new()],
25 impl NADecoder for IMAADPCMDecoder {
26 fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
27 if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
28 let channels = ainfo.get_channels() as usize;
29 validate!(channels == 2 || channels == 1);
30 self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), channels as u8, SND_S16P_FORMAT, PACKET_SAMPLES);
31 self.chmap = NAChannelMap::from_str(if channels == 1 { "C" } else { "L,R" }).unwrap();
34 Err(DecoderError::InvalidData)
37 fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
38 let info = pkt.get_stream().get_info();
39 if let NACodecTypeInfo::Audio(_) = info.get_properties() {
40 let pktbuf = pkt.get_buffer();
41 let channels = self.chmap.num_channels();
42 validate!(pktbuf.len() % (PACKET_LEN * channels) == 0);
43 let nblocks = pktbuf.len() / channels / PACKET_LEN;
44 let nsamples = nblocks * PACKET_SAMPLES;
45 let abuf = alloc_audio_buffer(self.ainfo, nsamples, self.chmap.clone())?;
46 let mut adata = abuf.get_abuf_i16().unwrap();
47 let mut off = [adata.get_offset(0), adata.get_offset(1)];
48 let dst = adata.get_data_mut().unwrap();
50 for data in pktbuf.chunks(PACKET_LEN * channels) {
51 for ch in 0..channels {
52 let mut mr = MemoryReader::new_read(&data[PACKET_LEN * ch..][..PACKET_LEN]);
53 let mut br = ByteReader::new(&mut mr);
55 let init = br.read_u16be()?;
56 let pred = (init as i16) & !0x7F;
57 let step = (init & 0x7F) as u8;
58 validate!(step <= IMA_MAX_STEP);
59 self.ch_state[ch].reset(pred, step);
61 for i in (0..PACKET_SAMPLES).step_by(2) {
62 let byte = br.read_byte()?;
63 dst[off[ch] + i] = self.ch_state[ch].expand_sample(byte & 0xF);
64 dst[off[ch] + i + 1] = self.ch_state[ch].expand_sample(byte >> 4);
66 off[ch] += PACKET_SAMPLES;
70 let mut frm = NAFrame::new_from_pkt(pkt, info.replace_info(NACodecTypeInfo::Audio(self.ainfo)), abuf);
71 frm.set_duration(Some(nsamples as u64));
72 frm.set_keyframe(false);
75 Err(DecoderError::InvalidData)
82 impl NAOptionHandler for IMAADPCMDecoder {
83 fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
84 fn set_options(&mut self, _options: &[NAOption]) { }
85 fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
88 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
89 Box::new(IMAADPCMDecoder::new())
94 use nihav_core::codecs::RegisteredDecoders;
95 use nihav_core::demuxers::RegisteredDemuxers;
96 use nihav_codec_support::test::dec_video::*;
97 use crate::qt_register_all_decoders;
98 use nihav_commonfmt::generic_register_all_demuxers;
100 fn test_ima_adpcm_qt() {
101 let mut dmx_reg = RegisteredDemuxers::new();
102 generic_register_all_demuxers(&mut dmx_reg);
103 let mut dec_reg = RegisteredDecoders::new();
104 qt_register_all_decoders(&mut dec_reg);
106 test_decoding("mov", "ima-adpcm-qt", "assets/QT/shuffle-ima41.mov", None, &dmx_reg, &dec_reg,
107 ExpectedTestResult::MD5([0xba2ad472, 0xd6aee026, 0xb915dd7d, 0xac51314c]));