[nihav-player.git] / sndplay / src / demux.rs

use std::io::SeekFrom;
use nihav_core::codecs::*;
use nihav_core::demuxers::*;
use nihav_registry::detect;
use nihav_core::io::byteio::ByteReader;
use super::allreg::FullRegister;

pub struct RawStreamCtx<'a> {
    stream: NAStreamRef,
    pkt:    Box<dyn NAPacketiser + Send>,
    br:     &'a mut ByteReader<'a>,
    pts:    u64,
    seek:   SeekIndex,
}

impl<'a> RawStreamCtx<'a> {
    fn new(stream: NAStreamRef, packetiser: Box<dyn NAPacketiser + Send>, br: &'a mut ByteReader<'a>) -> Self {
        let mut seek = SeekIndex::new();
        seek.add_stream(0);
        Self { stream, pkt: packetiser, br, pts: 0, seek }
    }
    fn account_for_packet(&mut self, packet: &mut NAPacket) {
        let pos = self.br.tell() - (self.pkt.bytes_left() as u64);
        if packet.get_pts().is_none() && packet.get_duration().is_some() {
            packet.ts.pts = Some(self.pts);
        }
        if packet.is_keyframe() {
            let pts = packet.get_pts().unwrap_or(self.pts);
            let time = NATimeInfo::ts_to_time(pts, 1000, self.stream.tb_num, self.stream.tb_den);
            let in_range = if let Some(last) = self.seek.seek_info[0].entries.last() {
                    last.pts >= pts
                } else {
                    false
                };
            if !in_range {
                self.seek.add_entry(0, SeekEntry { time, pts, pos });
            }
        }
        self.pts += packet.get_duration().unwrap_or(0);
    }
    fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
        let mut buf = [0; 1048576];
        loop {
            match self.pkt.get_packet(self.stream.clone()) {
                Ok(Some(mut packet)) => {
                    self.account_for_packet(&mut packet);
                    return Ok(packet);
                },
                Ok(None) => {},
                Err(DecoderError::ShortData) => {},
                _ => return Err(DemuxerError::InvalidData),
            };
            match self.br.read_buf_some(&mut buf) {
                Ok(size) => {
                    self.pkt.add_data(&buf[..size]);
                },
                Err(_) => {
                    match self.pkt.get_packet(self.stream.clone()) {
                        Ok(Some(mut packet)) => {
                            self.account_for_packet(&mut packet);
                            return Ok(packet);
                        },
                        Ok(None) | Err(DecoderError::ShortData) => return Err(DemuxerError::EOF),
                        _ => return Err(DemuxerError::InvalidData),
                    };
                },
            };
        }
    }
}

pub enum DemuxerObject<'a> {
    None,
    Normal(Demuxer<'a>),
    Raw(RawDemuxer<'a>, Vec<Option<Box<dyn NAPacketiser + Send>>>, bool),
    RawStream(RawStreamCtx<'a>),
}

impl<'a> DemuxerObject<'a> {
    pub fn create(br: &'a mut ByteReader<'a>, reg: &FullRegister, name: &str, is_raw: bool) -> DemuxerObject<'a> {
        if !is_raw {
            let res = detect::detect_format(name, br);
            let (dmx_name, _) = res.unwrap_or(("", detect::DetectionScore::No));
            if !dmx_name.is_empty() {
                println!("trying demuxer {} on {}", dmx_name, name);
                if let Some(dmx_fact) = reg.dmx_reg.find_demuxer(dmx_name) {
                    br.seek(SeekFrom::Start(0)).unwrap();
                    let dmx = create_demuxer(dmx_fact, br).unwrap();
                    return DemuxerObject::Normal(dmx);
                }
            }
            if !dmx_name.is_empty() {
                println!("trying raw demuxer {} on {}", dmx_name, name);
                if let Some(rdmx_fact) = reg.rdmx_reg.find_demuxer(dmx_name) {
                    br.seek(SeekFrom::Start(0)).unwrap();
                    let dmx = create_raw_demuxer(rdmx_fact, br).unwrap();
                    let mut pkts = Vec::new();
                    for stream in dmx.get_streams() {
                        if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
                            let mut packetiser = (pcreate)();
                            packetiser.attach_stream(stream);
                            pkts.push(Some(packetiser));
                        } else {
                            pkts.push(None);
                        }
                    }
                    return DemuxerObject::Raw(dmx, pkts, false);
                }
            }
            for rdmx in reg.rdmx_reg.iter() {
                if rdmx.check_format(br) {
                    println!("detected {} as {}", name, rdmx.get_name());
                    br.seek(SeekFrom::Start(0)).unwrap();
                    let dmx = create_raw_demuxer(*rdmx, br).unwrap();
                    let mut pkts = Vec::new();
                    for stream in dmx.get_streams() {
                        if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
                            let packetiser = (pcreate)();
                            pkts.push(Some(packetiser));
                        } else {
                            pkts.push(None);
                        }
                    }
                    return DemuxerObject::Raw(dmx, pkts, false);
                }
            }
        }
        br.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = vec![0; 1048576];
        let size = br.read_buf_some(&mut buf).unwrap();
        br.seek(SeekFrom::Start(0)).unwrap();
        let mut pname = "";

        for pinfo in reg.pkt_reg.iter() {
            let mut packetiser = (pinfo.get_packetiser)();
            packetiser.add_data(&buf[..size]);
            if packetiser.parse_stream(0).is_ok() {
                pname = pinfo.name;
                break;
            }
        }
        if !pname.is_empty() {
            println!("found raw stream of type {} for {}", pname, name);
            let pcreate = reg.pkt_reg.find_packetiser(pname).unwrap();
            let mut packetiser = (pcreate)();
            packetiser.add_data(&buf[..size]);
            let stream = packetiser.parse_stream(0).unwrap();
            packetiser.reset();
            DemuxerObject::RawStream(RawStreamCtx::new(stream, packetiser, br))
        } else {
            DemuxerObject::None
        }
    }
    pub fn is_none(&self) -> bool {
        matches!(*self, DemuxerObject::None)
    }
    pub fn get_duration(&self) -> u64 {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_duration(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_duration(),
            DemuxerObject::RawStream(ref ctx) => {
                NATimeInfo::ts_to_time(ctx.stream.duration, 1000, ctx.stream.tb_num, ctx.stream.tb_den)
            },
            _ => 0,
        }
    }
    pub fn get_num_streams(&self) -> usize {
        match *self {
            DemuxerObject::None => 0,
            DemuxerObject::Normal(ref dmx) => dmx.get_num_streams(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_num_streams(),
            DemuxerObject::RawStream(_) => 1,
        }
    }
    pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_stream(idx),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream(idx),
            DemuxerObject::RawStream(ref ctx) if idx == 0 => Some(ctx.stream.clone()),
            _ => None,
        }
    }
    pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
        match *self {
            DemuxerObject::Normal(ref mut dmx) => dmx.get_frame(),
            DemuxerObject::Raw(ref mut dmx, ref mut packetisers, ref mut eof) => {
                loop {
                    let mut has_some = false;
                    for (stream, p) in dmx.get_streams().zip(packetisers.iter_mut()) {
                        if let Some(ref mut pkts) = p {
                            match pkts.get_packet(stream.clone()) {
                                Ok(Some(pkt)) => return Ok(pkt),
                                Ok(None) | Err(DecoderError::ShortData) => {
                                    if *eof {
                                        *p = None;
                                    }
                                },
                                Err(err) => {
                                    println!("packetisation error {:?}", err);
                                    return Err(DemuxerError::InvalidData);
                                }
                            };
                            has_some |= p.is_some();
                        }
                    }
                    if !has_some {
                        return Err(DemuxerError::EOF);
                    }
                    if let Ok(data) = dmx.get_data() {
                        let id = data.get_stream().get_id();
                        for (i, stream) in dmx.get_streams().enumerate() {
                            if stream.get_id() == id {
                                if let Some(ref mut pkts) = packetisers[i] {
                                    pkts.add_data(&data.get_buffer());
                                }
                                break;
                            }
                        }
                    } else {
                        *eof = true;
                    }
                }
            },
            DemuxerObject::RawStream(ref mut ctx) => ctx.get_frame(),
            _ => unreachable!(),
        }
    }
    pub fn seek(&mut self, seek_time: NATimePoint) -> DemuxerResult<()> {
        match *self {
            DemuxerObject::Normal(ref mut dmx) => dmx.seek(seek_time),
            DemuxerObject::Raw(ref mut dmx, _, _) => dmx.seek(seek_time),
            DemuxerObject::RawStream(ref mut ctx) => {
                if seek_time == NATimePoint::None {
                    return Err(DemuxerError::SeekError);
                }
                if let Some(last) = ctx.seek.seek_info[0].entries.last() {
                    let in_index = match seek_time {
                            NATimePoint::None => unreachable!(),
                            NATimePoint::PTS(pts) => last.pts >= pts,
                            NATimePoint::Milliseconds(ms) => last.time >= ms,
                        };
                    if in_index {
                        if let Some(result) = ctx.seek.find_pos(seek_time) {
                            ctx.br.seek(SeekFrom::Start(result.pos))?;
                            ctx.pts = result.pts;
                            ctx.pkt.reset();
                            return Ok(());
                        }
                    }
                }
                if let Some(last) = ctx.seek.seek_info[0].entries.last() {
                    ctx.br.seek(SeekFrom::Start(last.pos))?;
                    ctx.pts = last.pts;
                    ctx.pkt.reset();
                }
                let mut key_pts = 0;
                while let Ok(pkt) = ctx.get_frame() {
                    if !pkt.ts.less_than(seek_time) && !pkt.ts.equal(seek_time) {
                        break;
                    }
                    if pkt.is_keyframe() {
                        key_pts = pkt.get_pts().unwrap_or(0);
                    }
                }
                let result = ctx.seek.find_pos(NATimePoint::PTS(key_pts)).unwrap();
                ctx.br.seek(SeekFrom::Start(result.pos))?;
                ctx.pts = result.pts;
                ctx.pkt.reset();
                Ok(())
            },
            _ => Err(DemuxerError::NotImplemented),
        }
    }
}

pub fn detect_tags(br: &mut ByteReader) -> (bool, u64, Option<u64>) {
    let mut is_raw = false;
    let mut start = 0;
    let mut end = None;

    // check for ID3v{2-4}
    let mut buf = [0; 5];
    loop {
        if br.peek_buf(&mut buf).is_err() {
            break;
        }
        if &buf[0..3] == b"ID3" && buf[3] > 0 && buf[3] < 5 && buf[4] == 0 { //ID3 tag found, must be a raw stream
            br.read_skip(6).unwrap();
            let mut size = 0;
            for _ in 0..4 {
                let b = br.read_byte().unwrap();
                if (b & 0x80) != 0 {
                    println!("Invalid ID3 size");
                    break;
                }
                size = (size << 7) | u64::from(b);
            }
            start += size + 10;
            br.read_skip(size as usize).unwrap();
            while let Ok(0) = br.read_byte() {
                start += 1;
            }
            br.seek(SeekFrom::Start(start)).unwrap();
            is_raw = true;
        } else {
            break;
        }
    }
    // check for ID3v1
    br.seek(SeekFrom::End(-128)).unwrap();
    let off = br.tell();
    br.peek_buf(&mut buf[..3]).unwrap();
    if &buf[0..3] == b"TAG" {
        end = Some(off);
        // check for Lyrics v2
        let mut sig = [0; 9];
        br.seek(SeekFrom::End(-128 - 9)).unwrap();
        br.peek_buf(&mut sig).unwrap();
        if &sig == b"LYRICS200" {
            br.seek(SeekFrom::Current(-6)).unwrap();
            let mut sizestr = [0; 6];
            br.peek_buf(&mut sizestr).unwrap();
            if let Ok(sstr) = std::str::from_utf8(&sizestr) {
                if let Ok(size) = sstr.parse::<u64>() {
                    end = Some(br.tell() - size);
                }
            }
        }
    }
    // check for APETAG
    let mut buf = [0; 8];
    if let Some(off) = end {
        br.seek(SeekFrom::Start(off - 32)).unwrap();
    } else {
        br.seek(SeekFrom::End(-32)).unwrap();
    }
    let off = br.tell();
    br.read_buf(&mut buf).unwrap();
    if &buf == b"APETAGEX" {
        let ver     = br.read_u32le().unwrap();
        let size    = u64::from(br.read_u32le().unwrap());
        let _items  = br.read_u32le().unwrap();
        let flags   = br.read_u32le().unwrap();
        if ver == 1000 || (flags & 0x80000000) == 0 {
            end = Some(off - size + 32);
        } else {
            end = Some(off - size);
        }
    }

    (is_raw, start, end)
}
Commit	Line	Data
e08bbe03 KS	1	use std::io::SeekFrom;
	2	use nihav_core::codecs::*;
	3	use nihav_core::demuxers::*;
	4	use nihav_registry::detect;
	5	use nihav_core::io::byteio::ByteReader;
	6	use super::allreg::FullRegister;
	7
aa5a110c KS	8	pub struct RawStreamCtx<'a> {
	9	stream: NAStreamRef,
	10	pkt: Box<dyn NAPacketiser + Send>,
	11	br: &'a mut ByteReader<'a>,
	12	pts: u64,
	13	seek: SeekIndex,
	14	}
	15
	16	impl<'a> RawStreamCtx<'a> {
	17	fn new(stream: NAStreamRef, packetiser: Box<dyn NAPacketiser + Send>, br: &'a mut ByteReader<'a>) -> Self {
	18	let mut seek = SeekIndex::new();
	19	seek.add_stream(0);
	20	Self { stream, pkt: packetiser, br, pts: 0, seek }
	21	}
	22	fn account_for_packet(&mut self, packet: &mut NAPacket) {
	23	let pos = self.br.tell() - (self.pkt.bytes_left() as u64);
	24	if packet.get_pts().is_none() && packet.get_duration().is_some() {
	25	packet.ts.pts = Some(self.pts);
	26	}
	27	if packet.is_keyframe() {
	28	let pts = packet.get_pts().unwrap_or(self.pts);
	29	let time = NATimeInfo::ts_to_time(pts, 1000, self.stream.tb_num, self.stream.tb_den);
	30	let in_range = if let Some(last) = self.seek.seek_info[0].entries.last() {
	31	last.pts >= pts
	32	} else {
	33	false
	34	};
	35	if !in_range {
	36	self.seek.add_entry(0, SeekEntry { time, pts, pos });
	37	}
	38	}
	39	self.pts += packet.get_duration().unwrap_or(0);
	40	}
	41	fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
	42	let mut buf = [0; 1048576];
	43	loop {
	44	match self.pkt.get_packet(self.stream.clone()) {
	45	Ok(Some(mut packet)) => {
	46	self.account_for_packet(&mut packet);
	47	return Ok(packet);
	48	},
	49	Ok(None) => {},
	50	Err(DecoderError::ShortData) => {},
	51	_ => return Err(DemuxerError::InvalidData),
	52	};
	53	match self.br.read_buf_some(&mut buf) {
	54	Ok(size) => {
	55	self.pkt.add_data(&buf[..size]);
	56	},
	57	Err(_) => {
	58	match self.pkt.get_packet(self.stream.clone()) {
	59	Ok(Some(mut packet)) => {
	60	self.account_for_packet(&mut packet);
	61	return Ok(packet);
	62	},
	63	Ok(None) \| Err(DecoderError::ShortData) => return Err(DemuxerError::EOF),
	64	_ => return Err(DemuxerError::InvalidData),
	65	};
	66	},
	67	};
	68	}
	69	}
	70	}
	71
e08bbe03 KS	72	pub enum DemuxerObject<'a> {
	73	None,
	74	Normal(Demuxer<'a>),
	75	Raw(RawDemuxer<'a>, Vec<Option<Box<dyn NAPacketiser + Send>>>, bool),
aa5a110c	76	RawStream(RawStreamCtx<'a>),
e08bbe03 KS	77	}
	78
	79	impl<'a> DemuxerObject<'a> {
	80	pub fn create(br: &'a mut ByteReader<'a>, reg: &FullRegister, name: &str, is_raw: bool) -> DemuxerObject<'a> {
	81	if !is_raw {
	82	let res = detect::detect_format(name, br);
	83	let (dmx_name, _) = res.unwrap_or(("", detect::DetectionScore::No));
9d321987	84	if !dmx_name.is_empty() {
e08bbe03 KS	85	println!("trying demuxer {} on {}", dmx_name, name);
	86	if let Some(dmx_fact) = reg.dmx_reg.find_demuxer(dmx_name) {
	87	br.seek(SeekFrom::Start(0)).unwrap();
	88	let dmx = create_demuxer(dmx_fact, br).unwrap();
	89	return DemuxerObject::Normal(dmx);
	90	}
	91	}
9d321987	92	if !dmx_name.is_empty() {
e08bbe03 KS	93	println!("trying raw demuxer {} on {}", dmx_name, name);
	94	if let Some(rdmx_fact) = reg.rdmx_reg.find_demuxer(dmx_name) {
	95	br.seek(SeekFrom::Start(0)).unwrap();
	96	let dmx = create_raw_demuxer(rdmx_fact, br).unwrap();
	97	let mut pkts = Vec::new();
	98	for stream in dmx.get_streams() {
	99	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
c84ea16d KS	100	let mut packetiser = (pcreate)();
c84ea16d KS	101	packetiser.attach_stream(stream);
e08bbe03 KS	102	pkts.push(Some(packetiser));
	103	} else {
	104	pkts.push(None);
	105	}
	106	}
	107	return DemuxerObject::Raw(dmx, pkts, false);
	108	}
	109	}
	110	for rdmx in reg.rdmx_reg.iter() {
	111	if rdmx.check_format(br) {
	112	println!("detected {} as {}", name, rdmx.get_name());
	113	br.seek(SeekFrom::Start(0)).unwrap();
	114	let dmx = create_raw_demuxer(*rdmx, br).unwrap();
	115	let mut pkts = Vec::new();
	116	for stream in dmx.get_streams() {
	117	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
	118	let packetiser = (pcreate)();
	119	pkts.push(Some(packetiser));
	120	} else {
	121	pkts.push(None);
	122	}
	123	}
	124	return DemuxerObject::Raw(dmx, pkts, false);
	125	}
	126	}
	127	}
	128	br.seek(SeekFrom::Start(0)).unwrap();
	129	let mut buf = vec![0; 1048576];
0ddbf4fc KS	130	let size = br.read_buf_some(&mut buf).unwrap();
0ddbf4fc KS	131	br.seek(SeekFrom::Start(0)).unwrap();
e08bbe03 KS	132	let mut pname = "";
	133
	134	for pinfo in reg.pkt_reg.iter() {
	135	let mut packetiser = (pinfo.get_packetiser)();
	136	packetiser.add_data(&buf[..size]);
	137	if packetiser.parse_stream(0).is_ok() {
	138	pname = pinfo.name;
	139	break;
	140	}
	141	}
9d321987	142	if !pname.is_empty() {
e08bbe03 KS	143	println!("found raw stream of type {} for {}", pname, name);
	144	let pcreate = reg.pkt_reg.find_packetiser(pname).unwrap();
	145	let mut packetiser = (pcreate)();
	146	packetiser.add_data(&buf[..size]);
	147	let stream = packetiser.parse_stream(0).unwrap();
	148	packetiser.reset();
aa5a110c	149	DemuxerObject::RawStream(RawStreamCtx::new(stream, packetiser, br))
e08bbe03 KS	150	} else {
	151	DemuxerObject::None
	152	}
	153	}
	154	pub fn is_none(&self) -> bool {
9d321987	155	matches!(*self, DemuxerObject::None)
e08bbe03 KS	156	}
	157	pub fn get_duration(&self) -> u64 {
	158	match *self {
	159	DemuxerObject::Normal(ref dmx) => dmx.get_duration(),
	160	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_duration(),
dbca8a6d KS	161	DemuxerObject::RawStream(ref ctx) => {
	162	NATimeInfo::ts_to_time(ctx.stream.duration, 1000, ctx.stream.tb_num, ctx.stream.tb_den)
	163	},
e08bbe03 KS	164	_ => 0,
	165	}
	166	}
	167	pub fn get_num_streams(&self) -> usize {
	168	match *self {
	169	DemuxerObject::None => 0,
	170	DemuxerObject::Normal(ref dmx) => dmx.get_num_streams(),
	171	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_num_streams(),
aa5a110c	172	DemuxerObject::RawStream(_) => 1,
e08bbe03 KS	173	}
	174	}
	175	pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
	176	match *self {
	177	DemuxerObject::Normal(ref dmx) => dmx.get_stream(idx),
	178	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream(idx),
aa5a110c	179	DemuxerObject::RawStream(ref ctx) if idx == 0 => Some(ctx.stream.clone()),
e08bbe03 KS	180	_ => None,
	181	}
	182	}
	183	pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
	184	match *self {
	185	DemuxerObject::Normal(ref mut dmx) => dmx.get_frame(),
	186	DemuxerObject::Raw(ref mut dmx, ref mut packetisers, ref mut eof) => {
	187	loop {
	188	let mut has_some = false;
	189	for (stream, p) in dmx.get_streams().zip(packetisers.iter_mut()) {
	190	if let Some(ref mut pkts) = p {
	191	match pkts.get_packet(stream.clone()) {
	192	Ok(Some(pkt)) => return Ok(pkt),
	193	Ok(None) \| Err(DecoderError::ShortData) => {
	194	if *eof {
	195	*p = None;
	196	}
	197	},
	198	Err(err) => {
	199	println!("packetisation error {:?}", err);
	200	return Err(DemuxerError::InvalidData);
	201	}
	202	};
	203	has_some \|= p.is_some();
	204	}
	205	}
	206	if !has_some {
	207	return Err(DemuxerError::EOF);
	208	}
	209	if let Ok(data) = dmx.get_data() {
	210	let id = data.get_stream().get_id();
	211	for (i, stream) in dmx.get_streams().enumerate() {
	212	if stream.get_id() == id {
	213	if let Some(ref mut pkts) = packetisers[i] {
	214	pkts.add_data(&data.get_buffer());
	215	}
	216	break;
	217	}
	218	}
	219	} else {
	220	*eof = true;
	221	}
	222	}
	223	},
aa5a110c	224	DemuxerObject::RawStream(ref mut ctx) => ctx.get_frame(),
e08bbe03 KS	225	_ => unreachable!(),
	226	}
	227	}
	228	pub fn seek(&mut self, seek_time: NATimePoint) -> DemuxerResult<()> {
	229	match *self {
	230	DemuxerObject::Normal(ref mut dmx) => dmx.seek(seek_time),
	231	DemuxerObject::Raw(ref mut dmx, _, _) => dmx.seek(seek_time),
aa5a110c KS	232	DemuxerObject::RawStream(ref mut ctx) => {
	233	if seek_time == NATimePoint::None {
	234	return Err(DemuxerError::SeekError);
	235	}
	236	if let Some(last) = ctx.seek.seek_info[0].entries.last() {
	237	let in_index = match seek_time {
	238	NATimePoint::None => unreachable!(),
	239	NATimePoint::PTS(pts) => last.pts >= pts,
	240	NATimePoint::Milliseconds(ms) => last.time >= ms,
	241	};
	242	if in_index {
	243	if let Some(result) = ctx.seek.find_pos(seek_time) {
	244	ctx.br.seek(SeekFrom::Start(result.pos))?;
	245	ctx.pts = result.pts;
	246	ctx.pkt.reset();
	247	return Ok(());
	248	}
	249	}
	250	}
	251	if let Some(last) = ctx.seek.seek_info[0].entries.last() {
	252	ctx.br.seek(SeekFrom::Start(last.pos))?;
	253	ctx.pts = last.pts;
	254	ctx.pkt.reset();
	255	}
	256	let mut key_pts = 0;
	257	while let Ok(pkt) = ctx.get_frame() {
	258	if !pkt.ts.less_than(seek_time) && !pkt.ts.equal(seek_time) {
	259	break;
	260	}
	261	if pkt.is_keyframe() {
	262	key_pts = pkt.get_pts().unwrap_or(0);
	263	}
	264	}
	265	let result = ctx.seek.find_pos(NATimePoint::PTS(key_pts)).unwrap();
	266	ctx.br.seek(SeekFrom::Start(result.pos))?;
	267	ctx.pts = result.pts;
	268	ctx.pkt.reset();
	269	Ok(())
	270	},
e08bbe03 KS	271	_ => Err(DemuxerError::NotImplemented),
	272	}
	273	}
	274	}
	275
	276	pub fn detect_tags(br: &mut ByteReader) -> (bool, u64, Option<u64>) {
	277	let mut is_raw = false;
	278	let mut start = 0;
	279	let mut end = None;
	280
	281	// check for ID3v{2-4}
	282	let mut buf = [0; 5];
695000c4 KS	283	loop {
	284	if br.peek_buf(&mut buf).is_err() {
	285	break;
	286	}
	287	if &buf[0..3] == b"ID3" && buf[3] > 0 && buf[3] < 5 && buf[4] == 0 { //ID3 tag found, must be a raw stream
	288	br.read_skip(6).unwrap();
	289	let mut size = 0;
	290	for _ in 0..4 {
	291	let b = br.read_byte().unwrap();
	292	if (b & 0x80) != 0 {
	293	println!("Invalid ID3 size");
	294	break;
	295	}
	296	size = (size << 7) \| u64::from(b);
e08bbe03	297	}
695000c4 KS	298	start += size + 10;
695000c4 KS	299	br.read_skip(size as usize).unwrap();
220f65f4 KS	300	while let Ok(0) = br.read_byte() {
	301	start += 1;
	302	}
	303	br.seek(SeekFrom::Start(start)).unwrap();
695000c4 KS	304	is_raw = true;
	305	} else {
	306	break;
e08bbe03	307	}
e08bbe03 KS	308	}
	309	// check for ID3v1
	310	br.seek(SeekFrom::End(-128)).unwrap();
	311	let off = br.tell();
	312	br.peek_buf(&mut buf[..3]).unwrap();
	313	if &buf[0..3] == b"TAG" {
	314	end = Some(off);
695000c4 KS	315	// check for Lyrics v2
	316	let mut sig = [0; 9];
	317	br.seek(SeekFrom::End(-128 - 9)).unwrap();
	318	br.peek_buf(&mut sig).unwrap();
	319	if &sig == b"LYRICS200" {
	320	br.seek(SeekFrom::Current(-6)).unwrap();
	321	let mut sizestr = [0; 6];
	322	br.peek_buf(&mut sizestr).unwrap();
	323	if let Ok(sstr) = std::str::from_utf8(&sizestr) {
	324	if let Ok(size) = sstr.parse::<u64>() {
	325	end = Some(br.tell() - size);
	326	}
	327	}
	328	}
e08bbe03 KS	329	}
	330	// check for APETAG
	331	let mut buf = [0; 8];
	332	if let Some(off) = end {
	333	br.seek(SeekFrom::Start(off - 32)).unwrap();
	334	} else {
	335	br.seek(SeekFrom::End(-32)).unwrap();
	336	}
	337	let off = br.tell();
	338	br.read_buf(&mut buf).unwrap();
	339	if &buf == b"APETAGEX" {
	340	let ver = br.read_u32le().unwrap();
	341	let size = u64::from(br.read_u32le().unwrap());
	342	let _items = br.read_u32le().unwrap();
	343	let flags = br.read_u32le().unwrap();
	344	if ver == 1000 \|\| (flags & 0x80000000) == 0 {
	345	end = Some(off - size + 32);
	346	} else {
	347	end = Some(off - size);
	348	}
	349	}
	350
	351	(is_raw, start, end)
	352	}