[nihav.git] / nihav-registry / src / detect.rs

//! Container format detection.
//!
//! Usually user does not know the container format of the opened file.
//! That is why format detection functionality is needed.
//! This module contains the set of rules to detect container not merely by file extension but also by its content if possible.
//!
//! # Examples
//!
//! ```no_run
//! use nihav_core::detect::detect_format;
//! use std::fs::File;
//! use nihav_core::io::byteio::*;
//!
//! let name = "mediafile.ogv";
//! let mut file = File::open(name).unwrap();
//! let mut filereader = FileReader::new_read(&mut file);
//! let mut br = ByteReader::new(&mut filereader);
//! let result = detect_format(name, &mut br);
//! if let Some((name, score)) = result {
//!     println!("detected format {} with score {:?}", name, score);
//! }
//! ```
use std::io::SeekFrom;
use nihav_core::io::byteio::ByteReader;

/// Format detection score.
#[derive(Debug,Clone,Copy,PartialEq)]
pub enum DetectionScore {
    /// Format is not detected.
    No,
    /// Format matched by file extension.
    ExtensionMatches,
    /// Format matches by markers inside the file.
    MagicMatches,
}

impl DetectionScore {
    /// Checks whether current detection score is less than a value it is compared against.
    pub fn less(self, other: DetectionScore) -> bool {
        (self as i32) < (other as i32)
    }
}

#[allow(dead_code)]
enum Arg {
    Byte(u8),
    U16BE(u16),
    U16LE(u16),
    U24BE(u32),
    U24LE(u32),
    U32BE(u32),
    U32LE(u32),
    U64BE(u64),
    U64LE(u64),
}

impl Arg {
    fn val(&self) -> u64 {
        match *self {
            Arg::Byte(b) => { u64::from(b) }
            Arg::U16BE(v) => { u64::from(v) }
            Arg::U16LE(v) => { u64::from(v) }
            Arg::U24BE(v) => { u64::from(v) }
            Arg::U24LE(v) => { u64::from(v) }
            Arg::U32BE(v) => { u64::from(v) }
            Arg::U32LE(v) => { u64::from(v) }
            Arg::U64BE(v) => { v }
            Arg::U64LE(v) => { v }
        }
    }
    fn read_val(&self, src: &mut ByteReader) -> Option<u64> {
        match *self {
            Arg::Byte(_) => {
                let res = src.peek_byte();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U16BE(_) => {
                let res = src.peek_u16be();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U16LE(_) => {
                let res = src.peek_u16le();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U24BE(_) => {
                let res = src.peek_u24be();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U24LE(_) => {
                let res = src.peek_u24le();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U32BE(_) => {
                let res = src.peek_u32be();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U32LE(_) => {
                let res = src.peek_u32le();
                if res.is_err() { return None; }
                Some(u64::from(res.unwrap()))
            }
            Arg::U64BE(_) => {
                let res = src.peek_u64be();
                if res.is_err() { return None; }
                Some(res.unwrap())
            }
            Arg::U64LE(_) => {
                let res = src.peek_u64le();
                if res.is_err() { return None; }
                Some(res.unwrap())
            }
        }
    }
    fn eq(&self, src: &mut ByteReader) -> bool {
        let val = self.read_val(src);
        if val.is_none() { false }
        else { val.unwrap() == self.val() }
    }
    fn ge(&self, src: &mut ByteReader) -> bool {
        let val = self.read_val(src);
        if val.is_none() { false }
        else { val.unwrap() >= self.val() }
    }
    fn gt(&self, src: &mut ByteReader) -> bool {
        let val = self.read_val(src);
        if val.is_none() { false }
        else { val.unwrap() > self.val() }
    }
    fn le(&self, src: &mut ByteReader) -> bool {
        let val = self.read_val(src);
        if val.is_none() { false }
        else { val.unwrap() <= self.val() }
    }
    fn lt(&self, src: &mut ByteReader) -> bool {
        let val = self.read_val(src);
        if val.is_none() { false }
        else { val.unwrap() < self.val() }
    }
}

#[allow(dead_code)]
enum CC<'a> {
    Or(&'a CC<'a>, &'a CC<'a>),
    Eq(Arg),
    Str(&'static [u8]),
    In(Arg, Arg),
    Lt(Arg),
    Le(Arg),
    Gt(Arg),
    Ge(Arg),
}

impl<'a> CC<'a> {
    fn eval(&self, src: &mut ByteReader) -> bool {
        match *self {
            CC::Or (ref a, ref b) => { a.eval(src) || b.eval(src) },
            CC::Eq(ref arg)      => { arg.eq(src) },
            CC::In(ref a, ref b) => { a.ge(src) && b.le(src) },
            CC::Lt(ref arg)      => { arg.lt(src) },
            CC::Le(ref arg)      => { arg.le(src) },
            CC::Gt(ref arg)      => { arg.gt(src) },
            CC::Ge(ref arg)      => { arg.ge(src) },
            CC::Str(str) => {
                let mut val: Vec<u8> = vec![0; str.len()];
                let res = src.peek_buf(val.as_mut_slice());
                if res.is_err() { return false; }
                val == str
            }
        }
    }
}

struct CheckItem<'a> {
    offs: u32,
    cond: &'a CC<'a>,
}

#[allow(dead_code)]
struct DetectConditions<'a> {
    demux_name: &'static str,
    extensions: &'static str,
    conditions: &'a [CheckItem<'a>],
}

const DETECTORS: &[DetectConditions] = &[
    DetectConditions {
        demux_name: "avi",
        extensions: ".avi",
        conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b"RIFF"), &CC::Str(b"ON2 ")) },
                      CheckItem{offs: 8, cond: &CC::Or(&CC::Or(&CC::Str(b"AVI LIST"),
                                                               &CC::Str(b"AVIXLIST")),
                                                               &CC::Str(b"ON2fLIST")) },
                     ]
    },
    DetectConditions {
        demux_name: "wav",
        extensions: ".wav",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"RIFF") },
                      CheckItem{offs: 8, cond: &CC::Str(b"WAVEfmt ") }
                     ]
    },
    DetectConditions {
        demux_name: "mov",
        extensions: ".mov",
        conditions: &[CheckItem{offs: 4, cond: &CC::Or(&CC::Or(&CC::Str(b"mdat"),
                                                               &CC::Str(b"moov")),
                                                               &CC::Str(b"ftyp")) }],
    },
    DetectConditions {
        demux_name: "mov",
        extensions: ".mov",
        conditions: &[CheckItem{offs:  0, cond: &CC::Str(b"\x00\x00\x00\x08wide") },
                      CheckItem{offs: 12, cond: &CC::Or(&CC::Or(&CC::Str(b"mdat"),
                                                                &CC::Str(b"moov")),
                                                                &CC::Str(b"ftyp")) }],
    },
    DetectConditions {
        demux_name: "gdv",
        extensions: ".gdv",
        conditions: &[CheckItem{offs: 0, cond: &CC::Eq(Arg::U32LE(0x29111994))}],
    },
    DetectConditions {
        demux_name: "realaudio",
        extensions: ".ra,.ram",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b".ra\xFD")}],
    },
    DetectConditions {
        demux_name: "realmedia",
        extensions: ".rm,.rmvb,.rma,.ra,.ram",
        conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b".RMF"), &CC::Str(b".RMP")) },
                      CheckItem{offs: 4, cond: &CC::Ge(Arg::U32BE(10))}],
    },
    DetectConditions {
        demux_name: "real_ivr",
        extensions: ".ivr",
        conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b".R1M"), &CC::Str(b".REC"))}],
    },
    DetectConditions {
        demux_name: "bink",
        extensions: ".bik,.bk2",
        conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::In(Arg::U32BE(0x42494B62),     // BIKb
                                                               Arg::U32BE(0x42494B7B)),    // BIKz
                                                       &CC::In(Arg::U32BE(0x4B423261),     // KB2a
                                                               Arg::U32BE(0x4B42327B)))}], // KB2z
    },
    DetectConditions {
        demux_name: "smacker",
        extensions: ".smk",
        conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b"SMK2"), &CC::Str(b"SMK4"))}],
    },
    DetectConditions {
        demux_name: "ape",
        extensions: ".ape",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"MAC ") },
                      CheckItem{offs: 4, cond: &CC::In(Arg::U16LE(3800), Arg::U16LE(3990))}],
    },
    DetectConditions {
        demux_name: "flac",
        extensions: ".flac",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"fLaC") }],
    },
    DetectConditions {
        demux_name: "tta",
        extensions: ".tta",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"TTA1") }],
    },
    DetectConditions {
        demux_name: "wavpack",
        extensions: ".wv",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"wvpk") },
                      CheckItem{offs: 8, cond: &CC::In(Arg::U16LE(0x402), Arg::U16LE(0x410))}],
    },
    DetectConditions {
        demux_name: "vivo",
        extensions: ".viv",
        conditions: &[CheckItem{offs: 0, cond: &CC::In(Arg::U16BE(1), Arg::U16BE(0xFF))},
                      CheckItem{offs: 2, cond: &CC::Str(b"\x0D\x0AVersion:Vivo/")}],
    },
    DetectConditions {
        demux_name: "vivo",
        extensions: ".viv",
        conditions: &[CheckItem{offs: 0, cond: &CC::In(Arg::U16BE(1), Arg::U16BE(0xFF))},
                      CheckItem{offs: 3, cond: &CC::Str(b"\x0D\x0AVersion:Vivo/")}],
    },
    DetectConditions {
        demux_name: "bmv",
        extensions: ".bmv",
        conditions: &[],
    },
    DetectConditions {
        demux_name: "bmv3",
        extensions: ".bmv",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"BMVi") },
                      CheckItem{offs: 32, cond: &CC::Str(b"DATA")}],
    },
    DetectConditions {
        demux_name: "vmd",
        extensions: ".vmd",
        conditions: &[],
    },
    DetectConditions {
        demux_name: "vx",
        extensions: ".vx",
        conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"VXDS") }],
    },
];

/// Tries to detect container format.
///
/// This function tries to determine container format using both file extension and checking against container specific markers inside.
/// In case of success the function returns short container name and the detection score.
/// Result should have the highest detection score among tested.
pub fn detect_format(name: &str, src: &mut ByteReader) -> Option<(&'static str, DetectionScore)> {
    let mut result = None;
    let lname = name.to_lowercase();
    for detector in DETECTORS {
        let mut score = DetectionScore::No;
        if !name.is_empty() {
            for ext in detector.extensions.split(',') {
                if lname.ends_with(ext) {
                    score = DetectionScore::ExtensionMatches;
                    break;
                }
            }
        }
        let mut passed = !detector.conditions.is_empty();
        for ck in detector.conditions {
            let ret = src.seek(SeekFrom::Start(u64::from(ck.offs)));
            if ret.is_err() {
                passed = false;
                break;
            }
            if !ck.cond.eval(src) {
                passed = false;
                break;
            }
        }
        if passed {
            score = DetectionScore::MagicMatches;
        }
        if score == DetectionScore::MagicMatches {
            return Some((detector.demux_name, score));
        }
        if result.is_none() && score != DetectionScore::No {
            result = Some((detector.demux_name, score));
        } else if result.is_some() {
            let (_, oldsc) = result.unwrap();
            if oldsc.less(score) {
                result = Some((detector.demux_name, score));
            }
        }
    }
    result
}

/// Tries to detect container format for provided file name.
pub fn detect_format_by_name(name: &str) -> Option<(&'static str)> {
    if name.is_empty() {
        return None;
    }
    let lname = name.to_lowercase();
    for detector in DETECTORS {
        for ext in detector.extensions.split(',') {
            if lname.ends_with(ext) {
                return Some(detector.demux_name);
            }
        }
    }
    None
}

#[cfg(test)]
mod test {
    use super::*;
    use std::fs::File;
    use crate::io::byteio::*;

    #[test]
    fn test_avi_detect() {
        let name = "assets/Indeo/laser05.avi";
        let mut file = File::open(name).unwrap();
        let mut fr = FileReader::new_read(&mut file);
        let mut br = ByteReader::new(&mut fr);
        let (name, score) = detect_format(name, &mut br).unwrap();
        assert_eq!(name, "avi");
        assert_eq!(score, DetectionScore::MagicMatches);
    }

    #[test]
    fn test_gdv_detect() {
        let name = "assets/Game/intro1.gdv";
        let mut file = File::open(name).unwrap();
        let mut fr = FileReader::new_read(&mut file);
        let mut br = ByteReader::new(&mut fr);
        let (name, score) = detect_format(name, &mut br).unwrap();
        assert_eq!(name, "gdv");
        assert_eq!(score, DetectionScore::MagicMatches);
    }
}
Commit	Line	Data
1b5ebe1d KS	1	//! Container format detection.
	2	//!
	3	//! Usually user does not know the container format of the opened file.
	4	//! That is why format detection functionality is needed.
	5	//! This module contains the set of rules to detect container not merely by file extension but also by its content if possible.
	6	//!
	7	//! # Examples
	8	//!
	9	//! ```no_run
	10	//! use nihav_core::detect::detect_format;
	11	//! use std::fs::File;
	12	//! use nihav_core::io::byteio::*;
	13	//!
	14	//! let name = "mediafile.ogv";
	15	//! let mut file = File::open(name).unwrap();
	16	//! let mut filereader = FileReader::new_read(&mut file);
	17	//! let mut br = ByteReader::new(&mut filereader);
	18	//! let result = detect_format(name, &mut br);
	19	//! if let Some((name, score)) = result {
	20	//! println!("detected format {} with score {:?}", name, score);
	21	//! }
	22	//! ```
d8ce0de0	23	use std::io::SeekFrom;
32f7cbe5	24	use nihav_core::io::byteio::ByteReader;
d8ce0de0	25
1b5ebe1d	26	/// Format detection score.
d8ce0de0 KS	27	#[derive(Debug,Clone,Copy,PartialEq)]
d8ce0de0 KS	28	pub enum DetectionScore {
1b5ebe1d	29	/// Format is not detected.
d8ce0de0	30	No,
1b5ebe1d	31	/// Format matched by file extension.
d8ce0de0	32	ExtensionMatches,
1b5ebe1d	33	/// Format matches by markers inside the file.
d8ce0de0 KS	34	MagicMatches,
	35	}
	36
	37	impl DetectionScore {
1b5ebe1d	38	/// Checks whether current detection score is less than a value it is compared against.
e243ceb4 KS	39	pub fn less(self, other: DetectionScore) -> bool {
e243ceb4 KS	40	(self as i32) < (other as i32)
d8ce0de0 KS	41	}
	42	}
	43
	44	#[allow(dead_code)]
b5bd2ae4	45	enum Arg {
d8ce0de0 KS	46	Byte(u8),
	47	U16BE(u16),
	48	U16LE(u16),
	49	U24BE(u32),
	50	U24LE(u32),
	51	U32BE(u32),
	52	U32LE(u32),
	53	U64BE(u64),
	54	U64LE(u64),
	55	}
	56
b5bd2ae4	57	impl Arg {
d8ce0de0 KS	58	fn val(&self) -> u64 {
d8ce0de0 KS	59	match *self {
e243ceb4 KS	60	Arg::Byte(b) => { u64::from(b) }
	61	Arg::U16BE(v) => { u64::from(v) }
	62	Arg::U16LE(v) => { u64::from(v) }
	63	Arg::U24BE(v) => { u64::from(v) }
	64	Arg::U24LE(v) => { u64::from(v) }
	65	Arg::U32BE(v) => { u64::from(v) }
	66	Arg::U32LE(v) => { u64::from(v) }
b5bd2ae4 KS	67	Arg::U64BE(v) => { v }
b5bd2ae4 KS	68	Arg::U64LE(v) => { v }
d8ce0de0 KS	69	}
	70	}
	71	fn read_val(&self, src: &mut ByteReader) -> Option<u64> {
	72	match *self {
b5bd2ae4	73	Arg::Byte(_) => {
d8ce0de0	74	let res = src.peek_byte();
e243ceb4 KS	75	if res.is_err() { return None; }
e243ceb4 KS	76	Some(u64::from(res.unwrap()))
d8ce0de0	77	}
b5bd2ae4	78	Arg::U16BE(_) => {
d8ce0de0	79	let res = src.peek_u16be();
e243ceb4 KS	80	if res.is_err() { return None; }
e243ceb4 KS	81	Some(u64::from(res.unwrap()))
d8ce0de0	82	}
b5bd2ae4	83	Arg::U16LE(_) => {
d8ce0de0	84	let res = src.peek_u16le();
e243ceb4 KS	85	if res.is_err() { return None; }
e243ceb4 KS	86	Some(u64::from(res.unwrap()))
d8ce0de0	87	}
b5bd2ae4	88	Arg::U24BE(_) => {
d8ce0de0	89	let res = src.peek_u24be();
e243ceb4 KS	90	if res.is_err() { return None; }
e243ceb4 KS	91	Some(u64::from(res.unwrap()))
d8ce0de0	92	}
b5bd2ae4	93	Arg::U24LE(_) => {
d8ce0de0	94	let res = src.peek_u24le();
e243ceb4 KS	95	if res.is_err() { return None; }
e243ceb4 KS	96	Some(u64::from(res.unwrap()))
d8ce0de0	97	}
b5bd2ae4	98	Arg::U32BE(_) => {
d8ce0de0	99	let res = src.peek_u32be();
e243ceb4 KS	100	if res.is_err() { return None; }
e243ceb4 KS	101	Some(u64::from(res.unwrap()))
d8ce0de0	102	}
b5bd2ae4	103	Arg::U32LE(_) => {
d8ce0de0	104	let res = src.peek_u32le();
e243ceb4 KS	105	if res.is_err() { return None; }
e243ceb4 KS	106	Some(u64::from(res.unwrap()))
d8ce0de0	107	}
b5bd2ae4	108	Arg::U64BE(_) => {
d8ce0de0	109	let res = src.peek_u64be();
e243ceb4	110	if res.is_err() { return None; }
d8ce0de0 KS	111	Some(res.unwrap())
d8ce0de0 KS	112	}
b5bd2ae4	113	Arg::U64LE(_) => {
d8ce0de0	114	let res = src.peek_u64le();
e243ceb4	115	if res.is_err() { return None; }
d8ce0de0 KS	116	Some(res.unwrap())
	117	}
	118	}
	119	}
	120	fn eq(&self, src: &mut ByteReader) -> bool {
	121	let val = self.read_val(src);
e243ceb4	122	if val.is_none() { false }
d8ce0de0 KS	123	else { val.unwrap() == self.val() }
	124	}
	125	fn ge(&self, src: &mut ByteReader) -> bool {
	126	let val = self.read_val(src);
e243ceb4	127	if val.is_none() { false }
d8ce0de0 KS	128	else { val.unwrap() >= self.val() }
	129	}
	130	fn gt(&self, src: &mut ByteReader) -> bool {
	131	let val = self.read_val(src);
e243ceb4	132	if val.is_none() { false }
d8ce0de0 KS	133	else { val.unwrap() > self.val() }
	134	}
	135	fn le(&self, src: &mut ByteReader) -> bool {
	136	let val = self.read_val(src);
e243ceb4	137	if val.is_none() { false }
d8ce0de0 KS	138	else { val.unwrap() <= self.val() }
	139	}
	140	fn lt(&self, src: &mut ByteReader) -> bool {
	141	let val = self.read_val(src);
e243ceb4	142	if val.is_none() { false }
d8ce0de0 KS	143	else { val.unwrap() < self.val() }
	144	}
	145	}
	146
	147	#[allow(dead_code)]
b5bd2ae4 KS	148	enum CC<'a> {
	149	Or(&'a CC<'a>, &'a CC<'a>),
	150	Eq(Arg),
	151	Str(&'static [u8]),
	152	In(Arg, Arg),
	153	Lt(Arg),
	154	Le(Arg),
	155	Gt(Arg),
	156	Ge(Arg),
d8ce0de0 KS	157	}
d8ce0de0 KS	158
b5bd2ae4	159	impl<'a> CC<'a> {
d8ce0de0 KS	160	fn eval(&self, src: &mut ByteReader) -> bool {
d8ce0de0 KS	161	match *self {
b5bd2ae4 KS	162	CC::Or (ref a, ref b) => { a.eval(src) \|\| b.eval(src) },
b5bd2ae4 KS	163	CC::Eq(ref arg) => { arg.eq(src) },
4d477e23	164	CC::In(ref a, ref b) => { a.ge(src) && b.le(src) },
b5bd2ae4 KS	165	CC::Lt(ref arg) => { arg.lt(src) },
	166	CC::Le(ref arg) => { arg.le(src) },
	167	CC::Gt(ref arg) => { arg.gt(src) },
	168	CC::Ge(ref arg) => { arg.ge(src) },
	169	CC::Str(str) => {
e243ceb4	170	let mut val: Vec<u8> = vec![0; str.len()];
d8ce0de0	171	let res = src.peek_buf(val.as_mut_slice());
e243ceb4	172	if res.is_err() { return false; }
d8ce0de0 KS	173	val == str
	174	}
	175	}
	176	}
	177	}
	178
	179	struct CheckItem<'a> {
	180	offs: u32,
b5bd2ae4	181	cond: &'a CC<'a>,
d8ce0de0 KS	182	}
	183
	184	#[allow(dead_code)]
	185	struct DetectConditions<'a> {
	186	demux_name: &'static str,
	187	extensions: &'static str,
	188	conditions: &'a [CheckItem<'a>],
	189	}
	190
	191	const DETECTORS: &[DetectConditions] = &[
	192	DetectConditions {
	193	demux_name: "avi",
	194	extensions: ".avi",
b5bd2ae4 KS	195	conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b"RIFF"), &CC::Str(b"ON2 ")) },
	196	CheckItem{offs: 8, cond: &CC::Or(&CC::Or(&CC::Str(b"AVI LIST"),
	197	&CC::Str(b"AVIXLIST")),
	198	&CC::Str(b"ON2fLIST")) },
	199	]
d8ce0de0	200	},
283abfa6 KS	201	DetectConditions {
	202	demux_name: "wav",
	203	extensions: ".wav",
	204	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"RIFF") },
	205	CheckItem{offs: 8, cond: &CC::Str(b"WAVEfmt ") }
	206	]
	207	},
bdf66deb KS	208	DetectConditions {
	209	demux_name: "mov",
	210	extensions: ".mov",
	211	conditions: &[CheckItem{offs: 4, cond: &CC::Or(&CC::Or(&CC::Str(b"mdat"),
	212	&CC::Str(b"moov")),
	213	&CC::Str(b"ftyp")) }],
	214	},
	215	DetectConditions {
	216	demux_name: "mov",
	217	extensions: ".mov",
	218	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"\x00\x00\x00\x08wide") },
	219	CheckItem{offs: 12, cond: &CC::Or(&CC::Or(&CC::Str(b"mdat"),
	220	&CC::Str(b"moov")),
	221	&CC::Str(b"ftyp")) }],
	222	},
d8ce0de0 KS	223	DetectConditions {
	224	demux_name: "gdv",
	225	extensions: ".gdv",
b5bd2ae4	226	conditions: &[CheckItem{offs: 0, cond: &CC::Eq(Arg::U32LE(0x29111994))}],
d8ce0de0	227	},
ce52b3b5 KS	228	DetectConditions {
	229	demux_name: "realaudio",
	230	extensions: ".ra,.ram",
	231	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b".ra\xFD")}],
	232	},
	233	DetectConditions {
	234	demux_name: "realmedia",
	235	extensions: ".rm,.rmvb,.rma,.ra,.ram",
db5cc44b	236	conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b".RMF"), &CC::Str(b".RMP")) },
ce52b3b5 KS	237	CheckItem{offs: 4, cond: &CC::Ge(Arg::U32BE(10))}],
	238	},
	239	DetectConditions {
	240	demux_name: "real_ivr",
	241	extensions: ".ivr",
	242	conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b".R1M"), &CC::Str(b".REC"))}],
	243	},
c6c21059 KS	244	DetectConditions {
c6c21059 KS	245	demux_name: "bink",
4d477e23	246	extensions: ".bik,.bk2",
4998874b KS	247	conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::In(Arg::U32BE(0x42494B62), // BIKb
4998874b KS	248	Arg::U32BE(0x42494B7B)), // BIKz
c6c21059 KS	249	&CC::In(Arg::U32BE(0x4B423261), // KB2a
	250	Arg::U32BE(0x4B42327B)))}], // KB2z
	251	},
606c448e KS	252	DetectConditions {
	253	demux_name: "smacker",
	254	extensions: ".smk",
	255	conditions: &[CheckItem{offs: 0, cond: &CC::Or(&CC::Str(b"SMK2"), &CC::Str(b"SMK4"))}],
	256	},
87927c57 KS	257	DetectConditions {
	258	demux_name: "ape",
	259	extensions: ".ape",
	260	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"MAC ") },
	261	CheckItem{offs: 4, cond: &CC::In(Arg::U16LE(3800), Arg::U16LE(3990))}],
	262	},
	263	DetectConditions {
	264	demux_name: "flac",
	265	extensions: ".flac",
	266	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"fLaC") }],
	267	},
	268	DetectConditions {
	269	demux_name: "tta",
	270	extensions: ".tta",
	271	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"TTA1") }],
	272	},
	273	DetectConditions {
	274	demux_name: "wavpack",
	275	extensions: ".wv",
	276	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"wvpk") },
	277	CheckItem{offs: 8, cond: &CC::In(Arg::U16LE(0x402), Arg::U16LE(0x410))}],
	278	},
128253cc	279	DetectConditions {
31cf33ac KS	280	demux_name: "vivo",
	281	extensions: ".viv",
	282	conditions: &[CheckItem{offs: 0, cond: &CC::In(Arg::U16BE(1), Arg::U16BE(0xFF))},
	283	CheckItem{offs: 2, cond: &CC::Str(b"\x0D\x0AVersion:Vivo/")}],
	284	},
	285	DetectConditions {
	286	demux_name: "vivo",
	287	extensions: ".viv",
	288	conditions: &[CheckItem{offs: 0, cond: &CC::In(Arg::U16BE(1), Arg::U16BE(0xFF))},
	289	CheckItem{offs: 3, cond: &CC::Str(b"\x0D\x0AVersion:Vivo/")}],
	290	},
	291	DetectConditions {
128253cc KS	292	demux_name: "bmv",
	293	extensions: ".bmv",
	294	conditions: &[],
	295	},
ecda1cc1 KS	296	DetectConditions {
	297	demux_name: "bmv3",
	298	extensions: ".bmv",
	299	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"BMVi") },
	300	CheckItem{offs: 32, cond: &CC::Str(b"DATA")}],
	301	},
9895bd7b KS	302	DetectConditions {
	303	demux_name: "vmd",
	304	extensions: ".vmd",
	305	conditions: &[],
	306	},
55d85231 KS	307	DetectConditions {
	308	demux_name: "vx",
	309	extensions: ".vx",
	310	conditions: &[CheckItem{offs: 0, cond: &CC::Str(b"VXDS") }],
	311	},
d8ce0de0 KS	312	];
d8ce0de0 KS	313
1b5ebe1d KS	314	/// Tries to detect container format.
	315	///
	316	/// This function tries to determine container format using both file extension and checking against container specific markers inside.
	317	/// In case of success the function returns short container name and the detection score.
	318	/// Result should have the highest detection score among tested.
d8ce0de0 KS	319	pub fn detect_format(name: &str, src: &mut ByteReader) -> Option<(&'static str, DetectionScore)> {
	320	let mut result = None;
	321	let lname = name.to_lowercase();
	322	for detector in DETECTORS {
	323	let mut score = DetectionScore::No;
e243ceb4	324	if !name.is_empty() {
d8ce0de0 KS	325	for ext in detector.extensions.split(',') {
	326	if lname.ends_with(ext) {
	327	score = DetectionScore::ExtensionMatches;
	328	break;
	329	}
	330	}
	331	}
e243ceb4	332	let mut passed = !detector.conditions.is_empty();
d8ce0de0	333	for ck in detector.conditions {
e243ceb4 KS	334	let ret = src.seek(SeekFrom::Start(u64::from(ck.offs)));
e243ceb4 KS	335	if ret.is_err() {
d8ce0de0 KS	336	passed = false;
	337	break;
	338	}
	339	if !ck.cond.eval(src) {
	340	passed = false;
	341	break;
	342	}
	343	}
	344	if passed {
	345	score = DetectionScore::MagicMatches;
	346	}
	347	if score == DetectionScore::MagicMatches {
	348	return Some((detector.demux_name, score));
	349	}
4d477e23	350	if result.is_none() && score != DetectionScore::No {
d8ce0de0	351	result = Some((detector.demux_name, score));
4d477e23	352	} else if result.is_some() {
d8ce0de0 KS	353	let (_, oldsc) = result.unwrap();
	354	if oldsc.less(score) {
	355	result = Some((detector.demux_name, score));
	356	}
	357	}
	358	}
	359	result
	360	}
	361
4b56e8c9 KS	362	/// Tries to detect container format for provided file name.
	363	pub fn detect_format_by_name(name: &str) -> Option<(&'static str)> {
	364	if name.is_empty() {
	365	return None;
	366	}
	367	let lname = name.to_lowercase();
	368	for detector in DETECTORS {
	369	for ext in detector.extensions.split(',') {
	370	if lname.ends_with(ext) {
	371	return Some(detector.demux_name);
	372	}
	373	}
	374	}
	375	None
	376	}
	377
d8ce0de0 KS	378	#[cfg(test)]
	379	mod test {
	380	use super::*;
	381	use std::fs::File;
aca89041	382	use crate::io::byteio::*;
d8ce0de0 KS	383
	384	#[test]
	385	fn test_avi_detect() {
250c49f6	386	let name = "assets/Indeo/laser05.avi";
d8ce0de0 KS	387	let mut file = File::open(name).unwrap();
	388	let mut fr = FileReader::new_read(&mut file);
	389	let mut br = ByteReader::new(&mut fr);
	390	let (name, score) = detect_format(name, &mut br).unwrap();
	391	assert_eq!(name, "avi");
	392	assert_eq!(score, DetectionScore::MagicMatches);
	393	}
	394
	395	#[test]
	396	fn test_gdv_detect() {
250c49f6	397	let name = "assets/Game/intro1.gdv";
d8ce0de0 KS	398	let mut file = File::open(name).unwrap();
	399	let mut fr = FileReader::new_read(&mut file);
	400	let mut br = ByteReader::new(&mut fr);
	401	let (name, score) = detect_format(name, &mut br).unwrap();
	402	assert_eq!(name, "gdv");
	403	assert_eq!(score, DetectionScore::MagicMatches);
	404	}
b5bd2ae4	405	}