nihav-commonfmt/src/demuxers/wav.rs

   1 use nihav_core::demuxers::*;
   2 use nihav_registry::register;
   3 use nihav_core::demuxers::DemuxerError::*;
   4
   5 macro_rules! mktag {
   6     ($a:expr, $b:expr, $c:expr, $d:expr) => {
   7         (u32::from($a) << 24) | (u32::from($b) << 16) | (u32::from($c) << 8) | u32::from($d)
   8     };
   9     ($arr:expr) => {
  10         (u32::from($arr[0]) << 24) | (u32::from($arr[1]) << 16) | (u32::from($arr[2]) << 8) | u32::from($arr[3])
  11     };
  12 }
  13
  14 struct WAVDemuxer<'a> {
  15     src:            &'a mut ByteReader<'a>,
  16     data_pos:       u64,
  17     data_end:       u64,
  18     srate:          u32,
  19     block_size:     usize,
  20     is_pcm:         bool,
  21     avg_bytes:      u32,
  22 }
  23
  24 impl<'a> DemuxCore<'a> for WAVDemuxer<'a> {
  25     fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> {
  26         let riff                        = self.src.read_u32be()?;
  27         let riff_size                   = self.src.read_u32le()? as usize;
  28         let riff_end = self.src.tell() + if riff_size > 0 { riff_size as u64 } else { u64::from(std::u32::MAX) };
  29         let wave                        = self.src.read_u32be()?;
  30         validate!(riff == mktag!(b"RIFF"));
  31         validate!(wave == mktag!(b"WAVE"));
  32
  33         seek_index.mode = SeekIndexMode::Automatic;
  34
  35         let mut fmt_parsed = false;
  36         let mut _duration = 0;
  37         while self.src.tell() < riff_end {
  38             let ctype                   = self.src.read_tag()?;
  39             let csize                   = self.src.read_u32le()? as usize;
  40             match &ctype {
  41                 b"fmt " => {
  42                     validate!(!fmt_parsed);
  43                     self.parse_fmt(strmgr, csize)?;
  44                     fmt_parsed = true;
  45                 },
  46                 b"fact" => {
  47                     validate!(csize == 4);
  48                     _duration           = self.src.read_u32le()? as usize;
  49                 },
  50                 b"data" => {
  51                     validate!(fmt_parsed);
  52                     self.data_pos = self.src.tell();
  53                     self.data_end = self.data_pos + (csize as u64);
  54                     return Ok(());
  55                 },
  56                 _ => {
  57                                           self.src.read_skip(csize)?;
  58                 },
  59             };
  60         }
  61         Err(DemuxerError::InvalidData)
  62     }
  63
  64     fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
  65         if self.src.tell() >= self.data_end {
  66             return Err(DemuxerError::EOF);
  67         }
  68         let str = strmgr.get_stream(0);
  69         if str.is_none() { return Err(InvalidData); }
  70         let stream = str.unwrap();
  71         let pts = if self.avg_bytes != 0 {
  72                 let pos = self.src.tell() - self.data_pos;
  73                 Some(pos * u64::from(self.srate) / u64::from(self.avg_bytes))
  74             } else {
  75                 None
  76             };
  77         let ts = NATimeInfo::new(pts, None, None, 1, self.srate);
  78         if self.is_pcm {
  79             let mut bsize = self.block_size;
  80             while bsize < 256 {
  81                 bsize <<= 1;
  82             }
  83             let mut buf = vec![0; bsize];
  84             let size                    = self.src.read_buf_some(buf.as_mut_slice())?;
  85             buf.truncate(size);
  86             Ok(NAPacket::new(stream, ts, true, buf))
  87         } else {
  88             self.src.read_packet(stream, ts, true, self.block_size)
  89         }
  90     }
  91
  92     fn seek(&mut self, time: NATimePoint, _seek_index: &SeekIndex) -> DemuxerResult<()> {
  93         if self.block_size != 0 && self.avg_bytes != 0 {
  94             let seek_off = match time {
  95                     NATimePoint::Milliseconds(ms) => {
  96                         let seek_dst = u64::from(self.avg_bytes) * ms / 1000;
  97                         seek_dst / (self.block_size as u64) * (self.block_size as u64)
  98                     },
  99                     NATimePoint::PTS(pts) => (self.block_size as u64) * pts,
 100                     NATimePoint::None => return Ok(()),
 101                 };
 102             self.src.seek(SeekFrom::Start(self.data_pos + seek_off))?;
 103             Ok(())
 104         } else {
 105             Err(DemuxerError::NotImplemented)
 106         }
 107     }
 108 }
 109
 110 impl<'a> NAOptionHandler for WAVDemuxer<'a> {
 111     fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
 112     fn set_options(&mut self, _options: &[NAOption]) { }
 113     fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
 114 }
 115
 116 impl<'a> WAVDemuxer<'a> {
 117     fn new(io: &'a mut ByteReader<'a>) -> Self {
 118         WAVDemuxer {
 119             src:        io,
 120             data_pos:   0,
 121             data_end:   0,
 122             srate:      0,
 123             block_size: 0,
 124             is_pcm:     false,
 125             avg_bytes:  0,
 126         }
 127     }
 128     fn parse_fmt(&mut self, strmgr: &mut StreamManager, csize: usize) -> DemuxerResult<()> {
 129         validate!(csize >= 14);
 130         let format_tag                  = self.src.read_u16le()?;
 131         let channels                    = self.src.read_u16le()?;
 132         validate!(channels < 256);
 133         let samples_per_sec             = self.src.read_u32le()?;
 134         let avg_bytes_per_sec           = self.src.read_u32le()?;
 135         let block_align                 = self.src.read_u16le()? as usize;
 136         if block_align == 0 {
 137             return Err(DemuxerError::NotImplemented);
 138         }
 139         let bits_per_sample             = if csize >= 16 { self.src.read_u16le()? } else { 8 };
 140         validate!(channels < 256);
 141
 142         let edata = if csize > 16 {
 143                 validate!(csize >= 18);
 144                 let cb_size             = self.src.read_u16le()? as usize;
 145                 let mut buf = vec![0; cb_size];
 146                                           self.src.read_buf(buf.as_mut_slice())?;
 147                 Some(buf)
 148             } else {
 149                 None
 150             };
 151
 152         let cname = register::find_codec_from_wav_twocc(format_tag).unwrap_or("unknown");
 153         let soniton = if cname == "pcm" {
 154                 if format_tag != 0x0003 {
 155                     if bits_per_sample == 8 {
 156                         NASoniton::new(8, 0)
 157                     } else {
 158                         NASoniton::new(bits_per_sample as u8, SONITON_FLAG_SIGNED)
 159                     }
 160                 } else {
 161                     NASoniton::new(bits_per_sample as u8, SONITON_FLAG_FLOAT)
 162                 }
 163             } else {
 164                 NASoniton::new(bits_per_sample as u8, SONITON_FLAG_SIGNED)
 165             };
 166         let ahdr = NAAudioInfo::new(samples_per_sec, channels as u8, soniton, block_align);
 167         let ainfo = NACodecInfo::new(cname, NACodecTypeInfo::Audio(ahdr), edata);
 168         let res = strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, 1, samples_per_sec));
 169         if res.is_none() { return Err(MemoryError); }
 170
 171         self.srate = samples_per_sec;
 172         self.block_size = block_align;
 173         self.avg_bytes = avg_bytes_per_sec;
 174         self.is_pcm = cname == "pcm";
 175
 176         Ok(())
 177     }
 178 }
 179
 180 pub struct WAVDemuxerCreator { }
 181
 182 impl DemuxerCreator for WAVDemuxerCreator {
 183     fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
 184         Box::new(WAVDemuxer::new(br))
 185     }
 186     fn get_name(&self) -> &'static str { "wav" }
 187 }
 188
 189 #[cfg(test)]
 190 mod test {
 191     use super::*;
 192     use std::fs::File;
 193
 194     #[test]
 195     fn test_wav_demux() {
 196         let mut file = File::open("assets/MS/scatter.wav").unwrap();
 197         let mut fr = FileReader::new_read(&mut file);
 198         let mut br = ByteReader::new(&mut fr);
 199         let mut dmx = WAVDemuxer::new(&mut br);
 200         let mut sm = StreamManager::new();
 201         let mut si = SeekIndex::new();
 202         dmx.open(&mut sm, &mut si).unwrap();
 203
 204         loop {
 205             let pktres = dmx.get_frame(&mut sm);
 206             if let Err(e) = pktres {
 207                 if e == DemuxerError::EOF { break; }
 208                 panic!("error");
 209             }
 210             let pkt = pktres.unwrap();
 211             println!("Got {}", pkt);
 212         }
 213     }
 214 }