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use nihav_core::demuxers::*;
struct IVFDemuxer<'a> {
src: &'a mut ByteReader<'a>,
nframes: u32,
frameno: u32,
}
impl<'a> IVFDemuxer<'a> {
fn new(src: &'a mut ByteReader<'a>) -> Self {
IVFDemuxer {
src,
nframes: 0,
frameno: 0,
}
}
}
impl<'a> DemuxCore<'a> for IVFDemuxer<'a> {
fn open(&mut self, strmgr: &mut StreamManager, _seek_index: &mut SeekIndex) -> DemuxerResult<()> {
let tag = self.src.read_tag()?;
validate!(&tag == b"DKIF");
let ver = self.src.read_u16le()?;
validate!(ver == 0);
let hdr_len = self.src.read_u16le()? as usize;
validate!(hdr_len >= 32);
let fcc = self.src.read_tag()?;
let codec_name = match &fcc {
b"VP80" => "vp8",
_ => "unknown",
};
let width = self.src.read_u16le()? as usize;
let height = self.src.read_u16le()? as usize;
validate!(width > 0 && height > 0);
let tb_den = self.src.read_u32le()?;
let tb_num = self.src.read_u32le()?;
self.nframes = self.src.read_u32le()?;
self.frameno = 0;
self.src.seek(SeekFrom::Start(hdr_len as u64))?;
let vci = NACodecTypeInfo::Video(NAVideoInfo::new(width, height, false, YUV420_FORMAT));
let vinfo = NACodecInfo::new(codec_name, vci, None);
if strmgr.add_stream(NAStream::new(StreamType::Video, 0, vinfo, tb_num, tb_den, u64::from(self.nframes))).is_none() {
return Err(DemuxerError::MemoryError);
}
Ok(())
}
fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
while self.frameno < self.nframes {
let fsize = self.src.read_u32le()? as usize;
let tstamp = self.src.read_u64le()?;
self.frameno += 1;
if fsize == 0 {
continue;
}
if let Some(stream) = strmgr.get_stream(0) {
let (tb_num, tb_den) = stream.get_timebase();
let ts = NATimeInfo::new(Some(tstamp), None, None, tb_num, tb_den);
return self.src.read_packet(stream, ts, false, fsize);
} else {
return Err(DemuxerError::InvalidData);
}
}
Err(DemuxerError::EOF)
}
fn seek(&mut self, _time: NATimePoint, _seek_index: &SeekIndex) -> DemuxerResult<()> {
Err(DemuxerError::NotPossible)
}
fn get_duration(&self) -> u64 { 0 }
}
impl<'a> NAOptionHandler for IVFDemuxer<'a> {
fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
fn set_options(&mut self, _options: &[NAOption]) { }
fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
}
pub struct IVFDemuxerCreator { }
impl DemuxerCreator for IVFDemuxerCreator {
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
Box::new(IVFDemuxer::new(br))
}
fn get_name(&self) -> &'static str { "dkivf" }
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
#[test]
fn test_ivf_demux() {
// sample is from the official VP8 test bitstream set
let mut file = File::open("assets/Duck/VP8/vp80-00-comprehensive-001.ivf").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br = ByteReader::new(&mut fr);
let mut dmx = IVFDemuxer::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);
}
}
}
|
