]> git.nihav.org Git - nihav.git/blob - pcm.rs
13eee09f9be01d6161b3dd0afe85af8a99befac5
[nihav.git] / pcm.rs
1 use nihav_core::formats::*;
2 use nihav_core::codecs::*;
3
4 struct PCMDecoder { chmap: NAChannelMap }
5
6 impl PCMDecoder {
7 fn new() -> Self {
8 PCMDecoder { chmap: NAChannelMap::new() }
9 }
10 }
11
12 const CHMAP_MONO: [NAChannelType; 1] = [NAChannelType::C];
13 const CHMAP_STEREO: [NAChannelType; 2] = [NAChannelType::L, NAChannelType::R];
14
15 fn get_default_chmap(nch: u8) -> NAChannelMap {
16 let mut chmap = NAChannelMap::new();
17 match nch {
18 1 => chmap.add_channels(&CHMAP_MONO),
19 2 => chmap.add_channels(&CHMAP_STEREO),
20 _ => (),
21 }
22 chmap
23 }
24
25 fn get_duration(ainfo: &NAAudioInfo, duration: Option<u64>, data_size: usize) -> u64 {
26 if duration == None {
27 let size_bits = (data_size as u64) * 8;
28 let blk_size = u64::from(ainfo.get_channels()) * u64::from(ainfo.get_format().get_bits());
29 size_bits / blk_size
30 } else {
31 duration.unwrap()
32 }
33 }
34
35 impl NADecoder for PCMDecoder {
36 fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
37 if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
38 self.chmap = get_default_chmap(ainfo.get_channels());
39 if self.chmap.num_channels() == 0 { return Err(DecoderError::InvalidData); }
40 Ok(())
41 } else {
42 Err(DecoderError::InvalidData)
43 }
44 }
45 fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
46 let info = pkt.get_stream().get_info();
47 if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
48 let duration = get_duration(&ainfo, pkt.get_duration(), pkt.get_buffer().len());
49 let pktbuf = pkt.get_buffer();
50 let abuf = NAAudioBuffer::new_from_buf(ainfo, pktbuf, self.chmap.clone());
51 let mut frm = NAFrame::new_from_pkt(pkt, info, NABufferType::AudioPacked(abuf));
52 frm.set_duration(Some(duration));
53 frm.set_keyframe(true);
54 Ok(frm.into_ref())
55 } else {
56 Err(DecoderError::InvalidData)
57 }
58 }
59 fn flush(&mut self) {
60 }
61 }
62
63 pub fn get_decoder() -> Box<dyn NADecoder + Send> {
64 Box::new(PCMDecoder::new())
65 }