[nihav-tool.git] / 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 nihav_allstuff::*;

pub struct FullRegister {
    pub dmx_reg:    RegisteredDemuxers,
    pub rdmx_reg:   RegisteredRawDemuxers,
    pub pkt_reg:    RegisteredPacketisers,
    pub dec_reg:    RegisteredDecoders,
}

impl FullRegister {
    pub fn new() -> Self {
        let mut dmx_reg = RegisteredDemuxers::new();
        nihav_register_all_demuxers(&mut dmx_reg);
        let mut rdmx_reg = RegisteredRawDemuxers::new();
        nihav_register_all_raw_demuxers(&mut rdmx_reg);
        let mut dec_reg = RegisteredDecoders::new();
        nihav_register_all_decoders(&mut dec_reg);
        let mut pkt_reg = RegisteredPacketisers::new();
        nihav_register_all_packetisers(&mut pkt_reg);
        Self { dmx_reg, rdmx_reg, pkt_reg, dec_reg }
    }
}

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, force_dmx: Option<&str>, is_raw: bool, opts: &[NAOption]) -> DemuxerObject<'a> {
        if !is_raw {
            let res = detect::detect_format(name, br);
            if let Some(dmx_name) = force_dmx {
                println!("forcing 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_with_options(dmx_fact, br, opts).unwrap();
                    return DemuxerObject::Normal(dmx);
                } else {
                    return DemuxerObject::None
                }
            }
            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_with_options(dmx_fact, br, opts).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_with_options(rdmx_fact, br, opts).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);
                }
            }
            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_with_options(*rdmx, br, opts).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);
        }
    }
    // check for MusicMatch tag
    let ret = if let Some(endpos) = end {
            br.seek(SeekFrom::Start(endpos - 0x30))
        } else {
            br.seek(SeekFrom::End(-0x30))
        };
    if ret.is_ok() && br.tell() > (0x2000 - 0x30) {
        let mut buf = [0; 19];
        br.peek_buf(&mut buf).unwrap();
        if &buf == b"Brava Software Inc." {
            br.seek(SeekFrom::Current(-20)).unwrap();
            let mut mm_start = u64::from(br.read_u32le().unwrap());
            if mm_start > 4 && mm_start + 0x2000 <= br.tell() {
                let diff = (br.tell() - mm_start) & 3;
                if diff != 0 {
                    mm_start -= 4 - diff;
                }
                end = Some(mm_start);
            }
        }
    }

    (is_raw, start, end)
}
Commit	Line	Data
	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 nihav_allstuff::*;
	7
	8	pub struct FullRegister {
	9	pub dmx_reg: RegisteredDemuxers,
	10	pub rdmx_reg: RegisteredRawDemuxers,
	11	pub pkt_reg: RegisteredPacketisers,
	12	pub dec_reg: RegisteredDecoders,
	13	}
	14
	15	impl FullRegister {
	16	pub fn new() -> Self {
	17	let mut dmx_reg = RegisteredDemuxers::new();
	18	nihav_register_all_demuxers(&mut dmx_reg);
	19	let mut rdmx_reg = RegisteredRawDemuxers::new();
	20	nihav_register_all_raw_demuxers(&mut rdmx_reg);
	21	let mut dec_reg = RegisteredDecoders::new();
	22	nihav_register_all_decoders(&mut dec_reg);
	23	let mut pkt_reg = RegisteredPacketisers::new();
	24	nihav_register_all_packetisers(&mut pkt_reg);
	25	Self { dmx_reg, rdmx_reg, pkt_reg, dec_reg }
	26	}
	27	}
	28
	29	pub struct RawStreamCtx<'a> {
	30	stream: NAStreamRef,
	31	pkt: Box<dyn NAPacketiser + Send>,
	32	br: &'a mut ByteReader<'a>,
	33	pts: u64,
	34	seek: SeekIndex,
	35	}
	36
	37	impl<'a> RawStreamCtx<'a> {
	38	fn new(stream: NAStreamRef, packetiser: Box<dyn NAPacketiser + Send>, br: &'a mut ByteReader<'a>) -> Self {
	39	let mut seek = SeekIndex::new();
	40	seek.add_stream(0);
	41	Self { stream, pkt: packetiser, br, pts: 0, seek }
	42	}
	43	fn account_for_packet(&mut self, packet: &mut NAPacket) {
	44	let pos = self.br.tell() - (self.pkt.bytes_left() as u64);
	45	if packet.get_pts().is_none() && packet.get_duration().is_some() {
	46	packet.ts.pts = Some(self.pts);
	47	}
	48	if packet.is_keyframe() {
	49	let pts = packet.get_pts().unwrap_or(self.pts);
	50	let time = NATimeInfo::ts_to_time(pts, 1000, self.stream.tb_num, self.stream.tb_den);
	51	let in_range = if let Some(last) = self.seek.seek_info[0].entries.last() {
	52	last.pts >= pts
	53	} else {
	54	false
	55	};
	56	if !in_range {
	57	self.seek.add_entry(0, SeekEntry { time, pts, pos });
	58	}
	59	}
	60	self.pts += packet.get_duration().unwrap_or(0);
	61	}
	62	fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
	63	let mut buf = [0; 1048576];
	64	loop {
	65	match self.pkt.get_packet(self.stream.clone()) {
	66	Ok(Some(mut packet)) => {
	67	self.account_for_packet(&mut packet);
	68	return Ok(packet);
	69	},
	70	Ok(None) => {},
	71	Err(DecoderError::ShortData) => {},
	72	_ => return Err(DemuxerError::InvalidData),
	73	};
	74	match self.br.read_buf_some(&mut buf) {
	75	Ok(size) => {
	76	self.pkt.add_data(&buf[..size]);
	77	},
	78	Err(_) => {
	79	match self.pkt.get_packet(self.stream.clone()) {
	80	Ok(Some(mut packet)) => {
	81	self.account_for_packet(&mut packet);
	82	return Ok(packet);
	83	},
	84	Ok(None) \| Err(DecoderError::ShortData) => return Err(DemuxerError::EOF),
	85	_ => return Err(DemuxerError::InvalidData),
	86	};
	87	},
	88	};
	89	}
	90	}
	91	}
	92
	93	pub enum DemuxerObject<'a> {
	94	None,
	95	Normal(Demuxer<'a>),
	96	Raw(RawDemuxer<'a>, Vec<Option<Box<dyn NAPacketiser + Send>>>, bool),
	97	RawStream(RawStreamCtx<'a>),
	98	}
	99
	100	impl<'a> DemuxerObject<'a> {
	101	pub fn create(br: &'a mut ByteReader<'a>, reg: &FullRegister, name: &str, force_dmx: Option<&str>, is_raw: bool, opts: &[NAOption]) -> DemuxerObject<'a> {
	102	if !is_raw {
	103	let res = detect::detect_format(name, br);
	104	if let Some(dmx_name) = force_dmx {
	105	println!("forcing demuxer {} on {}", dmx_name, name);
	106	if let Some(dmx_fact) = reg.dmx_reg.find_demuxer(dmx_name) {
	107	br.seek(SeekFrom::Start(0)).unwrap();
	108	let dmx = create_demuxer_with_options(dmx_fact, br, opts).unwrap();
	109	return DemuxerObject::Normal(dmx);
	110	} else {
	111	return DemuxerObject::None
	112	}
	113	}
	114	let (dmx_name, _) = res.unwrap_or(("", detect::DetectionScore::No));
	115	if !dmx_name.is_empty() {
	116	println!("trying demuxer {} on {}", dmx_name, name);
	117	if let Some(dmx_fact) = reg.dmx_reg.find_demuxer(dmx_name) {
	118	br.seek(SeekFrom::Start(0)).unwrap();
	119	let dmx = create_demuxer_with_options(dmx_fact, br, opts).unwrap();
	120	return DemuxerObject::Normal(dmx);
	121	}
	122	}
	123	if !dmx_name.is_empty() {
	124	println!("trying raw demuxer {} on {}", dmx_name, name);
	125	if let Some(rdmx_fact) = reg.rdmx_reg.find_demuxer(dmx_name) {
	126	br.seek(SeekFrom::Start(0)).unwrap();
	127	let dmx = create_raw_demuxer_with_options(rdmx_fact, br, opts).unwrap();
	128	let mut pkts = Vec::new();
	129	for stream in dmx.get_streams() {
	130	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
	131	let packetiser = (pcreate)();
	132	pkts.push(Some(packetiser));
	133	} else {
	134	pkts.push(None);
	135	}
	136	}
	137	return DemuxerObject::Raw(dmx, pkts, false);
	138	}
	139	}
	140	for rdmx in reg.rdmx_reg.iter() {
	141	if rdmx.check_format(br) {
	142	println!("detected {} as {}", name, rdmx.get_name());
	143	br.seek(SeekFrom::Start(0)).unwrap();
	144	let dmx = create_raw_demuxer_with_options(*rdmx, br, opts).unwrap();
	145	let mut pkts = Vec::new();
	146	for stream in dmx.get_streams() {
	147	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
	148	let packetiser = (pcreate)();
	149	pkts.push(Some(packetiser));
	150	} else {
	151	pkts.push(None);
	152	}
	153	}
	154	return DemuxerObject::Raw(dmx, pkts, false);
	155	}
	156	}
	157	}
	158	br.seek(SeekFrom::Start(0)).unwrap();
	159	let mut buf = vec![0; 1048576];
	160	let size = br.read_buf_some(&mut buf).unwrap();
	161	br.seek(SeekFrom::Start(0)).unwrap();
	162	let mut pname = "";
	163
	164	for pinfo in reg.pkt_reg.iter() {
	165	let mut packetiser = (pinfo.get_packetiser)();
	166	packetiser.add_data(&buf[..size]);
	167	if packetiser.parse_stream(0).is_ok() {
	168	pname = pinfo.name;
	169	break;
	170	}
	171	}
	172	if !pname.is_empty() {
	173	println!("found raw stream of type {} for {}", pname, name);
	174	let pcreate = reg.pkt_reg.find_packetiser(pname).unwrap();
	175	let mut packetiser = (pcreate)();
	176	packetiser.add_data(&buf[..size]);
	177	let stream = packetiser.parse_stream(0).unwrap();
	178	packetiser.reset();
	179	DemuxerObject::RawStream(RawStreamCtx::new(stream, packetiser, br))
	180	} else {
	181	DemuxerObject::None
	182	}
	183	}
	184	pub fn is_none(&self) -> bool {
	185	matches!(*self, DemuxerObject::None)
	186	}
	187	pub fn get_duration(&self) -> u64 {
	188	match *self {
	189	DemuxerObject::Normal(ref dmx) => dmx.get_duration(),
	190	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_duration(),
	191	DemuxerObject::RawStream(ref ctx) => {
	192	NATimeInfo::ts_to_time(ctx.stream.duration, 1000, ctx.stream.tb_num, ctx.stream.tb_den)
	193	},
	194	_ => 0,
	195	}
	196	}
	197	pub fn get_num_streams(&self) -> usize {
	198	match *self {
	199	DemuxerObject::None => 0,
	200	DemuxerObject::Normal(ref dmx) => dmx.get_num_streams(),
	201	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_num_streams(),
	202	DemuxerObject::RawStream(_) => 1,
	203	}
	204	}
	205	pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
	206	match *self {
	207	DemuxerObject::Normal(ref dmx) => dmx.get_stream(idx),
	208	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream(idx),
	209	DemuxerObject::RawStream(ref ctx) if idx == 0 => Some(ctx.stream.clone()),
	210	_ => None,
	211	}
	212	}
	213	pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
	214	match *self {
	215	DemuxerObject::Normal(ref mut dmx) => dmx.get_frame(),
	216	DemuxerObject::Raw(ref mut dmx, ref mut packetisers, ref mut eof) => {
	217	loop {
	218	let mut has_some = false;
	219	for (stream, p) in dmx.get_streams().zip(packetisers.iter_mut()) {
	220	if let Some(ref mut pkts) = p {
	221	match pkts.get_packet(stream.clone()) {
	222	Ok(Some(pkt)) => return Ok(pkt),
	223	Ok(None) \| Err(DecoderError::ShortData) => {
	224	if *eof {
	225	*p = None;
	226	}
	227	},
	228	Err(err) => {
	229	println!("packetisation error {:?}", err);
	230	return Err(DemuxerError::InvalidData);
	231	}
	232	};
	233	has_some \|= p.is_some();
	234	}
	235	}
	236	if !has_some {
	237	return Err(DemuxerError::EOF);
	238	}
	239	if let Ok(data) = dmx.get_data() {
	240	let id = data.get_stream().get_id();
	241	for (i, stream) in dmx.get_streams().enumerate() {
	242	if stream.get_id() == id {
	243	if let Some(ref mut pkts) = packetisers[i] {
	244	pkts.add_data(&data.get_buffer());
	245	}
	246	break;
	247	}
	248	}
	249	} else {
	250	*eof = true;
	251	}
	252	}
	253	},
	254	DemuxerObject::RawStream(ref mut ctx) => ctx.get_frame(),
	255	_ => unreachable!(),
	256	}
	257	}
	258	pub fn seek(&mut self, seek_time: NATimePoint) -> DemuxerResult<()> {
	259	match *self {
	260	DemuxerObject::Normal(ref mut dmx) => dmx.seek(seek_time),
	261	DemuxerObject::Raw(ref mut dmx, _, _) => dmx.seek(seek_time),
	262	DemuxerObject::RawStream(ref mut ctx) => {
	263	if seek_time == NATimePoint::None {
	264	return Err(DemuxerError::SeekError);
	265	}
	266	if let Some(last) = ctx.seek.seek_info[0].entries.last() {
	267	let in_index = match seek_time {
	268	NATimePoint::None => unreachable!(),
	269	NATimePoint::PTS(pts) => last.pts >= pts,
	270	NATimePoint::Milliseconds(ms) => last.time >= ms,
	271	};
	272	if in_index {
	273	if let Some(result) = ctx.seek.find_pos(seek_time) {
	274	ctx.br.seek(SeekFrom::Start(result.pos))?;
	275	ctx.pts = result.pts;
	276	ctx.pkt.reset();
	277	return Ok(());
	278	}
	279	}
	280	}
	281	if let Some(last) = ctx.seek.seek_info[0].entries.last() {
	282	ctx.br.seek(SeekFrom::Start(last.pos))?;
	283	ctx.pts = last.pts;
	284	ctx.pkt.reset();
	285	}
	286	let mut key_pts = 0;
	287	while let Ok(pkt) = ctx.get_frame() {
	288	if !pkt.ts.less_than(seek_time) && !pkt.ts.equal(seek_time) {
	289	break;
	290	}
	291	if pkt.is_keyframe() {
	292	key_pts = pkt.get_pts().unwrap_or(0);
	293	}
	294	}
	295	let result = ctx.seek.find_pos(NATimePoint::PTS(key_pts)).unwrap();
	296	ctx.br.seek(SeekFrom::Start(result.pos))?;
	297	ctx.pts = result.pts;
	298	ctx.pkt.reset();
	299	Ok(())
	300	},
	301	_ => Err(DemuxerError::NotImplemented),
	302	}
	303	}
	304	}
	305
	306	pub fn detect_tags(br: &mut ByteReader) -> (bool, u64, Option<u64>) {
	307	let mut is_raw = false;
	308	let mut start = 0;
	309	let mut end = None;
	310
	311	// check for ID3v{2-4}
	312	let mut buf = [0; 5];
	313	loop {
	314	if br.peek_buf(&mut buf).is_err() {
	315	break;
	316	}
	317	if &buf[0..3] == b"ID3" && buf[3] > 0 && buf[3] < 5 && buf[4] == 0 { //ID3 tag found, must be a raw stream
	318	br.read_skip(6).unwrap();
	319	let mut size = 0;
	320	for _ in 0..4 {
	321	let b = br.read_byte().unwrap();
	322	if (b & 0x80) != 0 {
	323	println!("Invalid ID3 size");
	324	break;
	325	}
	326	size = (size << 7) \| u64::from(b);
	327	}
	328	start += size + 10;
	329	br.read_skip(size as usize).unwrap();
	330	while let Ok(0) = br.read_byte() {
	331	start += 1;
	332	}
	333	br.seek(SeekFrom::Start(start)).unwrap();
	334	is_raw = true;
	335	} else {
	336	break;
	337	}
	338	}
	339	// check for ID3v1
	340	br.seek(SeekFrom::End(-128)).unwrap();
	341	let off = br.tell();
	342	br.peek_buf(&mut buf[..3]).unwrap();
	343	if &buf[0..3] == b"TAG" {
	344	end = Some(off);
	345	// check for Lyrics v2
	346	let mut sig = [0; 9];
	347	br.seek(SeekFrom::End(-128 - 9)).unwrap();
	348	br.peek_buf(&mut sig).unwrap();
	349	if &sig == b"LYRICS200" {
	350	br.seek(SeekFrom::Current(-6)).unwrap();
	351	let mut sizestr = [0; 6];
	352	br.peek_buf(&mut sizestr).unwrap();
	353	if let Ok(sstr) = std::str::from_utf8(&sizestr) {
	354	if let Ok(size) = sstr.parse::<u64>() {
	355	end = Some(br.tell() - size);
	356	}
	357	}
	358	}
	359	}
	360	// check for APETAG
	361	let mut buf = [0; 8];
	362	if let Some(off) = end {
	363	br.seek(SeekFrom::Start(off - 32)).unwrap();
	364	} else {
	365	br.seek(SeekFrom::End(-32)).unwrap();
	366	}
	367	let off = br.tell();
	368	br.read_buf(&mut buf).unwrap();
	369	if &buf == b"APETAGEX" {
	370	let ver = br.read_u32le().unwrap();
	371	let size = u64::from(br.read_u32le().unwrap());
	372	let _items = br.read_u32le().unwrap();
	373	let flags = br.read_u32le().unwrap();
	374	if ver == 1000 \|\| (flags & 0x80000000) == 0 {
	375	end = Some(off - size + 32);
	376	} else {
	377	end = Some(off - size);
	378	}
	379	}
	380	// check for MusicMatch tag
	381	let ret = if let Some(endpos) = end {
	382	br.seek(SeekFrom::Start(endpos - 0x30))
	383	} else {
	384	br.seek(SeekFrom::End(-0x30))
	385	};
	386	if ret.is_ok() && br.tell() > (0x2000 - 0x30) {
	387	let mut buf = [0; 19];
	388	br.peek_buf(&mut buf).unwrap();
	389	if &buf == b"Brava Software Inc." {
	390	br.seek(SeekFrom::Current(-20)).unwrap();
	391	let mut mm_start = u64::from(br.read_u32le().unwrap());
	392	if mm_start > 4 && mm_start + 0x2000 <= br.tell() {
	393	let diff = (br.tell() - mm_start) & 3;
	394	if diff != 0 {
	395	mm_start -= 4 - diff;
	396	}
	397	end = Some(mm_start);
	398	}
	399	}
	400	}
	401
	402	(is_raw, start, end)
	403	}