[nihav-encoder.git] / src / demux.rs

use std::io::SeekFrom;
use nihav_core::codecs::*;
use nihav_core::demuxers::*;
use nihav_core::muxers::*;
use nihav_registry::detect;
use nihav_core::io::byteio::ByteReader;
use nihav_allstuff::*;
use crate::null::*;

pub struct FullRegister {
    pub dmx_reg:    RegisteredDemuxers,
    pub rdmx_reg:   RegisteredRawDemuxers,
    pub pkt_reg:    RegisteredPacketisers,
    pub dec_reg:    RegisteredDecoders,
    pub enc_reg:    RegisteredEncoders,
    pub mux_reg:    RegisteredMuxers,
}

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);
        let mut enc_reg = RegisteredEncoders::new();
        nihav_register_all_encoders(&mut enc_reg);
        enc_reg.add_encoder(NULL_ENCODER);
        let mut mux_reg = RegisteredMuxers::new();
        nihav_register_all_muxers(&mut mux_reg);
        mux_reg.add_muxer(NULL_MUXER);
        Self { dmx_reg, rdmx_reg, pkt_reg, dec_reg, enc_reg, mux_reg }
    }
}

pub struct RawStreamCtx<'a> {
    stream:     NAStreamRef,
    sm:         StreamManager,
    packetiser: Box<dyn NAPacketiser + Send>,
    br:         &'a mut ByteReader<'a>,
}

impl<'a> RawStreamCtx<'a> {
    fn new(stream: NAStreamRef, packetiser: Box<dyn NAPacketiser + Send>, br: &'a mut ByteReader<'a>) -> Self {
        let mut sm = StreamManager::new();
        sm.add_stream_ref(stream.clone());
        Self { stream, sm, packetiser, br }
    }
}

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, ifmt: &Option<String>, is_raw: bool) -> DemuxerObject<'a> {
        if !is_raw {
            let dmx_name = if let Some(ref dname) = ifmt {
                    dname.as_str()
                } else if let Some((dname, score)) = detect::detect_format(name, br) {
                    println!("detected {} with score {:?}", dname, score);
                    dname
                } else {
                    ""
                };
            if dmx_name != "" {
                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 ifmt.is_some() {
                return DemuxerObject::None;
            }
            if dmx_name != "" {
                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 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(*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.peek_buf(&mut buf).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 != "" {
            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 {
        match *self {
            DemuxerObject::None => true,
            _ => false,
        }
    }
    pub fn get_duration(&self) -> u64 {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_duration(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_duration(),
            _ => 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_streams(&self) -> StreamIter {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_streams(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_streams(),
            DemuxerObject::RawStream(ref ctx) => ctx.sm.iter(),
            _ => unreachable!(),
        }
    }
    pub fn get_stream_manager(&self) -> &StreamManager {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_stream_manager(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream_manager(),
            DemuxerObject::RawStream(ref ctx) => &ctx.sm,
            _ => unreachable!(),
        }
    }
    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) => {
                let mut buf = [0; 65536];
                loop {
                    match ctx.packetiser.get_packet(ctx.stream.clone()) {
                        Ok(Some(packet)) => return Ok(packet),
                        Ok(None) => {},
                        Err(DecoderError::ShortData) => {},
                        _ => return Err(DemuxerError::InvalidData),
                    };
                    match ctx.br.read_buf_some(&mut buf) {
                        Ok(size) => {
                            ctx.packetiser.add_data(&buf[..size]);
                        },
                        Err(_) => {
                            match ctx.packetiser.get_packet(ctx.stream.clone()) {
                                Ok(Some(packet)) => return Ok(packet),
                                Ok(None) | Err(DecoderError::ShortData) => return Err(DemuxerError::EOF),
                                _ => return Err(DemuxerError::InvalidData),
                            };
                        },
                    };
                }
            },
            _ => 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),
            _ => Err(DemuxerError::NotImplemented),
        }
    }
}

impl<'a> NAOptionHandler for DemuxerObject<'a> {
    fn get_supported_options(&self) -> &[NAOptionDefinition] {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.get_supported_options(),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.get_supported_options(),
            _ => &[],
        }
    }
    fn set_options(&mut self, options: &[NAOption]) {
        match *self {
            DemuxerObject::Normal(ref mut dmx) => dmx.set_options(options),
            DemuxerObject::Raw(ref mut dmx, _, _) => dmx.set_options(options),
            _ => {},
        }
    }
    fn query_option_value(&self, name: &str) -> Option<NAValue> {
        match *self {
            DemuxerObject::Normal(ref dmx) => dmx.query_option_value(name),
            DemuxerObject::Raw(ref dmx, _, _) => dmx.query_option_value(name),
            _ => None,
        }
    }
}

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];
    br.peek_buf(&mut buf).unwrap();
    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;
        is_raw = true;
    }
    // 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 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
91a15e39 KS	1	use std::io::SeekFrom;
	2	use nihav_core::codecs::*;
	3	use nihav_core::demuxers::*;
	4	use nihav_core::muxers::*;
	5	use nihav_registry::detect;
	6	use nihav_core::io::byteio::ByteReader;
	7	use nihav_allstuff::*;
	8	use crate::null::*;
	9
	10	pub struct FullRegister {
	11	pub dmx_reg: RegisteredDemuxers,
	12	pub rdmx_reg: RegisteredRawDemuxers,
	13	pub pkt_reg: RegisteredPacketisers,
	14	pub dec_reg: RegisteredDecoders,
	15	pub enc_reg: RegisteredEncoders,
	16	pub mux_reg: RegisteredMuxers,
	17	}
	18
	19	impl FullRegister {
	20	pub fn new() -> Self {
	21	let mut dmx_reg = RegisteredDemuxers::new();
	22	nihav_register_all_demuxers(&mut dmx_reg);
	23	let mut rdmx_reg = RegisteredRawDemuxers::new();
	24	nihav_register_all_raw_demuxers(&mut rdmx_reg);
	25	let mut dec_reg = RegisteredDecoders::new();
	26	nihav_register_all_decoders(&mut dec_reg);
	27	let mut pkt_reg = RegisteredPacketisers::new();
	28	nihav_register_all_packetisers(&mut pkt_reg);
	29	let mut enc_reg = RegisteredEncoders::new();
	30	nihav_register_all_encoders(&mut enc_reg);
	31	enc_reg.add_encoder(NULL_ENCODER);
	32	let mut mux_reg = RegisteredMuxers::new();
	33	nihav_register_all_muxers(&mut mux_reg);
	34	mux_reg.add_muxer(NULL_MUXER);
	35	Self { dmx_reg, rdmx_reg, pkt_reg, dec_reg, enc_reg, mux_reg }
	36	}
	37	}
	38
	39	pub struct RawStreamCtx<'a> {
	40	stream: NAStreamRef,
	41	sm: StreamManager,
	42	packetiser: Box<dyn NAPacketiser + Send>,
	43	br: &'a mut ByteReader<'a>,
	44	}
	45
	46	impl<'a> RawStreamCtx<'a> {
	47	fn new(stream: NAStreamRef, packetiser: Box<dyn NAPacketiser + Send>, br: &'a mut ByteReader<'a>) -> Self {
	48	let mut sm = StreamManager::new();
	49	sm.add_stream_ref(stream.clone());
	50	Self { stream, sm, packetiser, br }
	51	}
	52	}
	53
	54	pub enum DemuxerObject<'a> {
	55	None,
	56	Normal(Demuxer<'a>),
	57	Raw(RawDemuxer<'a>, Vec<Option<Box<dyn NAPacketiser + Send>>>, bool),
	58	RawStream(RawStreamCtx<'a>),
	59	}
	60
	61	impl<'a> DemuxerObject<'a> {
	62	pub fn create(br: &'a mut ByteReader<'a>, reg: &FullRegister, name: &str, ifmt: &Option<String>, is_raw: bool) -> DemuxerObject<'a> {
	63	if !is_raw {
	64	let dmx_name = if let Some(ref dname) = ifmt {
65	dname.as_str()
66	} else if let Some((dname, score)) = detect::detect_format(name, br) {
67	println!("detected {} with score {:?}", dname, score);
68	dname
69	} else {
70	""
71	};
72	if dmx_name != "" {
73	println!("trying demuxer {} on {}", dmx_name, name);
74	if let Some(dmx_fact) = reg.dmx_reg.find_demuxer(dmx_name) {
75	br.seek(SeekFrom::Start(0)).unwrap();
76	let dmx = create_demuxer(dmx_fact, br).unwrap();
77	return DemuxerObject::Normal(dmx);
78	}
79	}
80	if ifmt.is_some() {
81	return DemuxerObject::None;
82	}
83	if dmx_name != "" {
84	println!("trying raw demuxer {} on {}", dmx_name, name);
85	if let Some(rdmx_fact) = reg.rdmx_reg.find_demuxer(dmx_name) {
86	br.seek(SeekFrom::Start(0)).unwrap();
87	let dmx = create_raw_demuxer(rdmx_fact, br).unwrap();
88	let mut pkts = Vec::new();
89	for stream in dmx.get_streams() {
90	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
91	let packetiser = (pcreate)();
92	pkts.push(Some(packetiser));
93	} else {
94	pkts.push(None);
95	}
96	}
97	return DemuxerObject::Raw(dmx, pkts, false);
98	}
99	}
100	for rdmx in reg.rdmx_reg.iter() {
101	if rdmx.check_format(br) {
102	println!("detected {} as {}", name, rdmx.get_name());
103	br.seek(SeekFrom::Start(0)).unwrap();
104	let dmx = create_raw_demuxer(*rdmx, br).unwrap();
105	let mut pkts = Vec::new();
106	for stream in dmx.get_streams() {
107	if let Some(pcreate) = reg.pkt_reg.find_packetiser(stream.get_info().get_name()) {
108	let packetiser = (pcreate)();
109	pkts.push(Some(packetiser));
110	} else {
111	pkts.push(None);
112	}
113	}
114	return DemuxerObject::Raw(dmx, pkts, false);
115	}
116	}
117	}
118	br.seek(SeekFrom::Start(0)).unwrap();
119	let mut buf = vec![0; 1048576];
120	let size = br.peek_buf(&mut buf).unwrap();
121	let mut pname = "";
122
123	for pinfo in reg.pkt_reg.iter() {
124	let mut packetiser = (pinfo.get_packetiser)();
125	packetiser.add_data(&buf[..size]);
126	if packetiser.parse_stream(0).is_ok() {
127	pname = pinfo.name;
128	break;
129	}
130	}
131	if pname != "" {
132	println!("found raw stream of type {} for {}", pname, name);
133	let pcreate = reg.pkt_reg.find_packetiser(pname).unwrap();
134	let mut packetiser = (pcreate)();
135	packetiser.add_data(&buf[..size]);
136	let stream = packetiser.parse_stream(0).unwrap();
137	packetiser.reset();
138	DemuxerObject::RawStream(RawStreamCtx::new(stream, packetiser, br))
139	} else {
140	DemuxerObject::None
141	}
142	}
143	pub fn is_none(&self) -> bool {
144	match *self {
145	DemuxerObject::None => true,
146	_ => false,
147	}
148	}
5ec8115f	149	pub fn get_duration(&self) -> u64 {
91a15e39 KS	150	match *self {
	151	DemuxerObject::Normal(ref dmx) => dmx.get_duration(),
	152	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_duration(),
	153	_ => 0,
	154	}
5ec8115f	155	}
91a15e39 KS	156	pub fn get_num_streams(&self) -> usize {
	157	match *self {
	158	DemuxerObject::None => 0,
	159	DemuxerObject::Normal(ref dmx) => dmx.get_num_streams(),
	160	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_num_streams(),
	161	DemuxerObject::RawStream(_) => 1,
	162	}
	163	}
	164	pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
	165	match *self {
	166	DemuxerObject::Normal(ref dmx) => dmx.get_stream(idx),
	167	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream(idx),
	168	DemuxerObject::RawStream(ref ctx) if idx == 0 => Some(ctx.stream.clone()),
	169	_ => None,
	170	}
	171	}
	172	pub fn get_streams(&self) -> StreamIter {
	173	match *self {
	174	DemuxerObject::Normal(ref dmx) => dmx.get_streams(),
	175	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_streams(),
	176	DemuxerObject::RawStream(ref ctx) => ctx.sm.iter(),
	177	_ => unreachable!(),
	178	}
	179	}
	180	pub fn get_stream_manager(&self) -> &StreamManager {
	181	match *self {
	182	DemuxerObject::Normal(ref dmx) => dmx.get_stream_manager(),
	183	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_stream_manager(),
	184	DemuxerObject::RawStream(ref ctx) => &ctx.sm,
	185	_ => unreachable!(),
	186	}
	187	}
	188	pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
	189	match *self {
	190	DemuxerObject::Normal(ref mut dmx) => dmx.get_frame(),
	191	DemuxerObject::Raw(ref mut dmx, ref mut packetisers, ref mut eof) => {
	192	loop {
	193	let mut has_some = false;
	194	for (stream, p) in dmx.get_streams().zip(packetisers.iter_mut()) {
	195	if let Some(ref mut pkts) = p {
	196	match pkts.get_packet(stream.clone()) {
	197	Ok(Some(pkt)) => return Ok(pkt),
	198	Ok(None) \| Err(DecoderError::ShortData) => {
	199	if *eof {
	200	*p = None;
	201	}
	202	},
	203	Err(err) => {
	204	println!("packetisation error {:?}", err);
	205	return Err(DemuxerError::InvalidData);
	206	}
	207	};
	208	has_some \|= p.is_some();
	209	}
	210	}
	211	if !has_some {
	212	return Err(DemuxerError::EOF);
	213	}
	214	if let Ok(data) = dmx.get_data() {
	215	let id = data.get_stream().get_id();
	216	for (i, stream) in dmx.get_streams().enumerate() {
	217	if stream.get_id() == id {
	218	if let Some(ref mut pkts) = packetisers[i] {
	219	pkts.add_data(&data.get_buffer());
220	}
221	break;
222	}
223	}
224	} else {
225	*eof = true;
226	}
227	}
228	},
229	DemuxerObject::RawStream(ref mut ctx) => {
230	let mut buf = [0; 65536];
231	loop {
232	match ctx.packetiser.get_packet(ctx.stream.clone()) {
233	Ok(Some(packet)) => return Ok(packet),
234	Ok(None) => {},
235	Err(DecoderError::ShortData) => {},
236	_ => return Err(DemuxerError::InvalidData),
237	};
238	match ctx.br.read_buf_some(&mut buf) {
239	Ok(size) => {
240	ctx.packetiser.add_data(&buf[..size]);
241	},
242	Err(_) => {
243	match ctx.packetiser.get_packet(ctx.stream.clone()) {
244	Ok(Some(packet)) => return Ok(packet),
245	Ok(None) \| Err(DecoderError::ShortData) => return Err(DemuxerError::EOF),
246	_ => return Err(DemuxerError::InvalidData),
247	};
248	},
249	};
250	}
251	},
252	_ => unreachable!(),
253	}
254	}
255	pub fn seek(&mut self, seek_time: NATimePoint) -> DemuxerResult<()> {
256	match *self {
257	DemuxerObject::Normal(ref mut dmx) => dmx.seek(seek_time),
258	DemuxerObject::Raw(ref mut dmx, _, _) => dmx.seek(seek_time),
259	_ => Err(DemuxerError::NotImplemented),
260	}
261	}
262	}
263
264	impl<'a> NAOptionHandler for DemuxerObject<'a> {
265	fn get_supported_options(&self) -> &[NAOptionDefinition] {
266	match *self {
267	DemuxerObject::Normal(ref dmx) => dmx.get_supported_options(),
268	DemuxerObject::Raw(ref dmx, _, _) => dmx.get_supported_options(),
269	_ => &[],
270	}
271	}
272	fn set_options(&mut self, options: &[NAOption]) {
273	match *self {
274	DemuxerObject::Normal(ref mut dmx) => dmx.set_options(options),
275	DemuxerObject::Raw(ref mut dmx, _, _) => dmx.set_options(options),
276	_ => {},
277	}
278	}
279	fn query_option_value(&self, name: &str) -> Option<NAValue> {
280	match *self {
281	DemuxerObject::Normal(ref dmx) => dmx.query_option_value(name),
282	DemuxerObject::Raw(ref dmx, _, _) => dmx.query_option_value(name),
283	_ => None,
284	}
285	}
286	}
287
288	pub fn detect_tags(br: &mut ByteReader) -> (bool, u64, Option<u64>) {
289	let mut is_raw = false;
290	let mut start = 0;
291	let mut end = None;
292
293	// check for ID3v{2-4}
294	let mut buf = [0; 5];
295	br.peek_buf(&mut buf).unwrap();
296	if &buf[0..3] == b"ID3" && buf[3] > 0 && buf[3] < 5 && buf[4] == 0 { //ID3 tag found, must be a raw stream
297	br.read_skip(6).unwrap();
298	let mut size = 0;
299	for _ in 0..4 {
300	let b = br.read_byte().unwrap();
301	if (b & 0x80) != 0 {
302	println!("Invalid ID3 size");
303	break;
304	}
305	size = (size << 7) \| u64::from(b);
306	}
307	start = size + 10;
308	is_raw = true;
309	}
310	// check for ID3v1
311	br.seek(SeekFrom::End(-128)).unwrap();
312	let off = br.tell();
313	br.peek_buf(&mut buf[..3]).unwrap();
314	if &buf[0..3] == b"TAG" {
315	end = Some(off);
316	}
317	// check for APETAG
318	let mut buf = [0; 8];
319	if let Some(off) = end {
320	br.seek(SeekFrom::Start(off - 32)).unwrap();
321	} else {
322	br.seek(SeekFrom::End(-32)).unwrap();
323	}
324	let off = br.tell();
325	br.read_buf(&mut buf).unwrap();
326	if &buf == b"APETAGEX" {
327	let ver = br.read_u32le().unwrap();
328	let size = u64::from(br.read_u32le().unwrap());
329	let _items = br.read_u32le().unwrap();
330	let flags = br.read_u32le().unwrap();
331	if ver == 1000 \|\| (flags & 0x80000000) == 0 {
332	end = Some(off - size + 32);
333	} else {
334	end = Some(off - size);
335	}
336	}
337
338	(is_raw, start, end)
339	}