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|
use nihav_core::demuxers::*;
use nihav_registry::register;
use nihav_core::demuxers::DemuxerError::*;
macro_rules! mktag {
($a:expr, $b:expr, $c:expr, $d:expr) => {
(u32::from($a) << 24) | (u32::from($b) << 16) | (u32::from($c) << 8) | u32::from($d)
};
($arr:expr) => {
(u32::from($arr[0]) << 24) | (u32::from($arr[1]) << 16) | (u32::from($arr[2]) << 8) | u32::from($arr[3])
};
}
struct WAVDemuxer<'a> {
src: &'a mut ByteReader<'a>,
data_pos: u64,
data_end: u64,
srate: u32,
block_size: usize,
is_pcm: bool,
avg_bytes: u32,
}
impl<'a> DemuxCore<'a> for WAVDemuxer<'a> {
fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> {
let riff = self.src.read_u32be()?;
let riff_size = self.src.read_u32le()? as usize;
let riff_end = self.src.tell() + if riff_size > 0 { (riff_size as u64) } else { u64::from(std::u32::MAX) };
let wave = self.src.read_u32be()?;
validate!(riff == mktag!(b"RIFF"));
validate!(wave == mktag!(b"WAVE"));
seek_index.mode = SeekIndexMode::Automatic;
let mut fmt_parsed = false;
let mut _duration = 0;
while self.src.tell() < riff_end {
let ctype = self.src.read_tag()?;
let csize = self.src.read_u32le()? as usize;
match &ctype {
b"fmt " => {
validate!(!fmt_parsed);
self.parse_fmt(strmgr, csize)?;
fmt_parsed = true;
},
b"fact" => {
validate!(csize == 4);
_duration = self.src.read_u32le()? as usize;
},
b"data" => {
validate!(fmt_parsed);
self.data_pos = self.src.tell();
self.data_end = self.data_pos + (csize as u64);
return Ok(());
},
_ => {
self.src.read_skip(csize)?;
},
};
}
Err(DemuxerError::InvalidData)
}
fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
if self.src.tell() >= self.data_end {
return Err(DemuxerError::EOF);
}
let str = strmgr.get_stream(0);
if str.is_none() { return Err(InvalidData); }
let stream = str.unwrap();
let ts = NATimeInfo::new(None, None, None, 1, self.srate);
if self.is_pcm {
let mut bsize = self.block_size;
while bsize < 256 {
bsize <<= 1;
}
let mut buf = vec![0; bsize];
let size = self.src.read_buf_some(buf.as_mut_slice())?;
buf.truncate(size);
Ok(NAPacket::new(stream, ts, true, buf))
} else {
self.src.read_packet(stream, ts, true, self.block_size)
}
}
fn seek(&mut self, time: u64, _seek_index: &SeekIndex) -> DemuxerResult<()> {
if self.block_size != 0 && self.avg_bytes != 0 {
let seek_dst = u64::from(self.avg_bytes) * time / 1000;
let seek_off = seek_dst / (self.block_size as u64) * (self.block_size as u64);
self.src.seek(SeekFrom::Start(self.data_pos + seek_off))?;
Ok(())
} else {
Err(DemuxerError::NotImplemented)
}
}
}
impl<'a> NAOptionHandler for WAVDemuxer<'a> {
fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
fn set_options(&mut self, _options: &[NAOption]) { }
fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
}
impl<'a> WAVDemuxer<'a> {
fn new(io: &'a mut ByteReader<'a>) -> Self {
WAVDemuxer {
src: io,
data_pos: 0,
data_end: 0,
srate: 0,
block_size: 0,
is_pcm: false,
avg_bytes: 0,
}
}
fn parse_fmt(&mut self, strmgr: &mut StreamManager, csize: usize) -> DemuxerResult<()> {
validate!(csize >= 14);
let format_tag = self.src.read_u16le()?;
let channels = self.src.read_u16le()?;
validate!(channels < 256);
let samples_per_sec = self.src.read_u32le()?;
let avg_bytes_per_sec = self.src.read_u32le()?;
let block_align = self.src.read_u16le()? as usize;
if block_align == 0 {
return Err(DemuxerError::NotImplemented);
}
let bits_per_sample = if csize >= 16 { self.src.read_u16le()? } else { 8 };
validate!(channels < 256);
let edata = if csize > 16 {
validate!(csize >= 18);
let cb_size = self.src.read_u16le()? as usize;
let mut buf = vec![0; cb_size];
self.src.read_buf(buf.as_mut_slice())?;
Some(buf)
} else {
None
};
let cname = register::find_codec_from_wav_twocc(format_tag).unwrap_or("unknown");
let soniton = if cname == "pcm" {
if format_tag != 0x0003 {
if bits_per_sample == 8 {
NASoniton::new(8, 0)
} else {
NASoniton::new(bits_per_sample as u8, SONITON_FLAG_SIGNED)
}
} else {
NASoniton::new(bits_per_sample as u8, SONITON_FLAG_FLOAT)
}
} else {
NASoniton::new(bits_per_sample as u8, SONITON_FLAG_SIGNED)
};
let ahdr = NAAudioInfo::new(samples_per_sec, channels as u8, soniton, block_align);
let ainfo = NACodecInfo::new(cname, NACodecTypeInfo::Audio(ahdr), edata);
let res = strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, 1, samples_per_sec));
if res.is_none() { return Err(MemoryError); }
self.srate = samples_per_sec;
self.block_size = block_align;
self.avg_bytes = avg_bytes_per_sec;
self.is_pcm = cname == "pcm";
Ok(())
}
}
pub struct WAVDemuxerCreator { }
impl DemuxerCreator for WAVDemuxerCreator {
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
Box::new(WAVDemuxer::new(br))
}
fn get_name(&self) -> &'static str { "wav" }
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
#[test]
fn test_wav_demux() {
let mut file = File::open("assets/MS/scatter.wav").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br = ByteReader::new(&mut fr);
let mut dmx = WAVDemuxer::new(&mut br);
let mut sm = StreamManager::new();
let mut si = SeekIndex::new();
dmx.open(&mut sm, &mut si).unwrap();
loop {
let pktres = dmx.get_frame(&mut sm);
if let Err(e) = pktres {
if e == DemuxerError::EOF { break; }
panic!("error");
}
let pkt = pktres.unwrap();
println!("Got {}", pkt);
}
}
}
|
