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use nihav_core::demuxers::*;
use std::str::FromStr;
struct Y4MDemuxer<'a> {
src: &'a mut ByteReader<'a>,
width: usize,
height: usize,
frame_size: usize,
hdr_size: u64,
fps_num: u32,
fps_den: u32,
frameno: u64,
}
impl<'a> DemuxCore<'a> for Y4MDemuxer<'a> {
fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> {
let format = self.parse_header()?;
seek_index.mode = SeekIndexMode::Automatic;
let vhdr = NAVideoInfo::new(self.width, self.height, false, format);
let vci = NACodecTypeInfo::Video(vhdr);
let vinfo = NACodecInfo::new("rawvideo", vci, None);
if strmgr.add_stream(NAStream::new(StreamType::Video, 0, vinfo, self.fps_num, self.fps_den, 0)).is_none() {
return Err(DemuxerError::MemoryError);
}
Ok(())
}
fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
let mut marker = [0u8; 6];
let res = self.src.read_buf(&mut marker);
match res {
Err(ByteIOError::EOF) => return Err(DemuxerError::EOF),
Err(err) => return Err(err.into()),
_ => {},
};
validate!(&marker == b"FRAME\n");
let stream = strmgr.get_stream(0).unwrap();
let ts = stream.make_ts(Some(self.frameno), None, None);
let pkt = self.src.read_packet(stream, ts, true, self.frame_size)?;
self.frameno += 1;
Ok(pkt)
}
fn seek(&mut self, time: NATimePoint, _seek_index: &SeekIndex) -> DemuxerResult<()> {
let new_fno = match time {
NATimePoint::PTS(pts) => {
pts
},
NATimePoint::Milliseconds(ms) => {
if (self.fps_num == 0) || (self.fps_den == 0) {
return Err(DemuxerError::SeekError);
}
NATimeInfo::time_to_ts(ms, 1000, self.fps_num, self.fps_den)
},
NATimePoint::None => return Err(DemuxerError::SeekError),
};
let pos = self.hdr_size + new_fno * ((self.frame_size + 6) as u64);
self.src.seek(SeekFrom::Start(pos))?;
self.frameno = new_fno;
Ok(())
}
fn get_duration(&self) -> u64 { 0 }
}
impl<'a> NAOptionHandler for Y4MDemuxer<'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> Y4MDemuxer<'a> {
fn new(io: &'a mut ByteReader<'a>) -> Self {
Self {
src: io,
width: 0,
height: 0,
frame_size: 0,
fps_num: 0,
fps_den: 0,
hdr_size: 0,
frameno: 0,
}
}
fn parse_header(&mut self) -> DemuxerResult<NAPixelFormaton> {
let mut format = YUV420_FORMAT;
let mut magic = [0u8; 10];
self.src.read_buf(&mut magic)?;
validate!(&magic == b"YUV4MPEG2 ");
while let Ok((last, tok)) = read_token(self.src) {
let (id, val) = tok.split_at(1);
validate!(id.len() == 1);
match id.bytes().next().unwrap() {
b'W' => {
if let Ok(w) = val.parse::<usize>() {
self.width = w;
}
},
b'H' => {
if let Ok(h) = val.parse::<usize>() {
self.height = h;
}
},
b'F' => {
if let Ok(fden) = val.parse::<u32>() {
self.fps_num = 1;
self.fps_den = fden;
} else {
let vals: Vec<&str> = val.split(':').collect();
if vals.len() == 2 {
if let Ok(fnum) = vals[1].parse::<u32>() {
self.fps_num = fnum;
}
if let Ok(fden) = vals[0].parse::<u32>() {
self.fps_den = fden;
}
}
}
},
b'C' => {
let fmt_str = val.as_bytes();
validate!(fmt_str.len() >= 3);
let mut pix_name: [u8; 7] = *b"yuv000p";
validate!(fmt_str[0] == b'4');
pix_name[3..6].copy_from_slice(&fmt_str[..3]);
if let Ok(fmt_name) = std::str::from_utf8(&pix_name) {
if let Ok(val) = NAPixelFormaton::from_str(fmt_name) {
format = val;
}
}
if format.model.is_yuv() {
format.model = ColorModel::YUV(YUVSubmodel::YCbCr);
if fmt_str.len() > 3 {
let (_, tail) = fmt_str.split_at(3);
if tail == b"jpeg" {
format.model = ColorModel::YUV(YUVSubmodel::YUVJ);
}
}
}
},
_ => {},
};
if last {
break;
}
}
validate!(self.width > 0 && self.height > 0);
self.frame_size = 0;
for chr in format.comp_info.iter().flatten() {
self.frame_size += chr.get_data_size(self.width, self.height);
}
validate!(self.frame_size > 0);
Ok(format)
}
}
fn read_token(src: &mut ByteReader) -> DemuxerResult<(bool, String)> {
let mut string = String::new();
let ws;
loop {
let b = src.read_byte()?;
match b {
b' ' | b'\n' => { ws = b; break; },
0..=0x7F => string.push(b as char),
_ => return Err(DemuxerError::InvalidData),
}
}
Ok((ws == b'\n', string))
}
pub struct Y4MDemuxerCreator { }
impl DemuxerCreator for Y4MDemuxerCreator {
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
Box::new(Y4MDemuxer::new(br))
}
fn get_name(&self) -> &'static str { "yuv4mpeg" }
}
#[cfg(test)]
mod test {
use super::*;
use std::fs::File;
#[test]
fn test_y4m_demux() {
// sample: self-created with avconv
let mut file = File::open("assets/Misc/test.y4m").unwrap();
let mut fr = FileReader::new_read(&mut file);
let mut br = ByteReader::new(&mut fr);
let mut dmx = Y4MDemuxer::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);
}
}
}
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