nihav-registry/src/register.rs

   1 //! Global registry of codec information.
   2 //!
   3 //! This module contains codec information from technical level that allows user to retrieve information about codec type and features without creating and invoking a decoder for such codec.
   4 use std::fmt;
   5
   6 /// Codec types.
   7 #[derive(Debug,Clone,Copy,PartialEq)]
   8 #[allow(dead_code)]
   9 pub enum CodecType {
  10     /// Video codec.
  11     Video,
  12     /// Audio codec.
  13     Audio,
  14     /// Subtitle codec.
  15     Subtitles,
  16     /// Some special codec (e.g. some event stream or separate timecodes stream).
  17     Data,
  18     /// Dummy codec.
  19     None,
  20 }
  21
  22 impl fmt::Display for CodecType {
  23     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  24         match *self {
  25             CodecType::Video => write!(f, "Video"),
  26             CodecType::Audio => write!(f, "Audio"),
  27             CodecType::Subtitles => write!(f, "Subtitles"),
  28             CodecType::Data => write!(f, "Data"),
  29             CodecType::None => write!(f, "-"),
  30         }
  31     }
  32 }
  33
  34 /// Codec capability flag for intra-only codecs.
  35 pub const CODEC_CAP_INTRAONLY:u32   = 0x0001;
  36 /// Codec capability flag for lossless codecs.
  37 pub const CODEC_CAP_LOSSLESS:u32    = 0x0002;
  38 /// Codec capability flag for codecs with frame reordering.
  39 pub const CODEC_CAP_REORDER:u32     = 0x0004;
  40 /// Codec capability flag for codecs that can be both lossy and lossless.
  41 pub const CODEC_CAP_HYBRID:u32      = 0x0008;
  42 /// Codec capability flag for codecs with scalability features.
  43 pub const CODEC_CAP_SCALABLE:u32    = 0x0010;
  44 /// Codec capability flag for codecs with complex frame reordering.
  45 pub const CODEC_CAP_COMPLEX_REORDER:u32 = 0x0020;
  46
  47 /// Codec description structure.
  48 #[derive(Clone)]
  49 pub struct CodecDescription {
  50     /// Short codec name.
  51     ///
  52     /// Short codec name is used inside NihAV as the unique identifier.
  53     pub name:  &'static str,
  54     /// Full codec name.
  55     pub fname: &'static str,
  56     /// Codec type.
  57     pub ctype: CodecType,
  58     /// Codec capabilities.
  59     pub caps:  u32,
  60 }
  61
  62 impl CodecDescription {
  63     /// Returns short codec name.
  64     pub fn get_name(&self) -> &'static str { self.name }
  65     /// Returns full codec name.
  66     pub fn get_full_name(&self) -> &'static str { self.fname }
  67     /// Returns codec type.
  68     pub fn get_codec_type(&self) -> CodecType { self.ctype }
  69     /// Reports whether the codec has only intra frames or not.
  70     pub fn is_intraonly(&self) -> bool { (self.caps & CODEC_CAP_INTRAONLY) != 0 }
  71     /// Reports whether the codec is lossless.
  72     pub fn is_lossless(&self)  -> bool { (self.caps & CODEC_CAP_LOSSLESS)  != 0 }
  73     /// Reports whether the codec requires frame reordering.
  74     pub fn has_reorder(&self)  -> bool { (self.caps & CODEC_CAP_REORDER)   != 0 }
  75     /// Reports whether the codec can be either lossless or lossy.
  76     pub fn is_hybrid(&self)    -> bool { (self.caps & CODEC_CAP_HYBRID)    != 0 }
  77     /// Reports whether codec supports scalability.
  78     ///
  79     /// Scalability means that codec can be decoded in reduced resolution by design.
  80     pub fn is_scalable(&self)  -> bool { (self.caps & CODEC_CAP_SCALABLE)  != 0 }
  81 }
  82
  83 impl fmt::Display for CodecDescription {
  84     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  85         let mut out = self.fname.to_string();
  86         if self.caps != 0 {
  87             let mut capfmt = "".to_string();
  88             if (self.caps & CODEC_CAP_INTRAONLY) != 0 {
  89                 capfmt = format!("{} Intra-only", capfmt);
  90             }
  91             if (self.caps & CODEC_CAP_LOSSLESS) != 0 {
  92                 capfmt = format!("{} Lossless", capfmt);
  93             }
  94             if (self.caps & CODEC_CAP_REORDER) != 0 {
  95                 capfmt = format!("{} Frame reorder", capfmt);
  96             }
  97             if (self.caps & CODEC_CAP_HYBRID) != 0 {
  98                 capfmt = format!("{} Can be lossy and lossless", capfmt);
  99             }
 100             if (self.caps & CODEC_CAP_SCALABLE) != 0 {
 101                 capfmt = format!("{} Scalable", capfmt);
 102             }
 103             out = format!("{} ({})", out, capfmt);
 104         }
 105         write!(f, "{}", out)
 106     }
 107 }
 108
 109 macro_rules! desc {
 110     (video; $n:expr, $fn:expr) => ({
 111         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 112                           caps: 0 }
 113     });
 114     (video; $n:expr, $fn:expr, $c:expr) => ({
 115         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 116                           caps: $c }
 117     });
 118     (video-ll; $n:expr, $fn:expr) => ({
 119         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 120                           caps: CODEC_CAP_LOSSLESS | CODEC_CAP_INTRAONLY }
 121     });
 122     (video-llp; $n:expr, $fn:expr) => ({
 123         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 124                           caps: CODEC_CAP_LOSSLESS }
 125     });
 126     (video-im; $n:expr, $fn:expr) => ({
 127         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 128                           caps: CODEC_CAP_INTRAONLY }
 129     });
 130     (video-modern; $n:expr, $fn:expr) => ({
 131         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Video,
 132                           caps: CODEC_CAP_REORDER | CODEC_CAP_HYBRID }
 133     });
 134     (audio; $n:expr, $fn:expr) => ({
 135         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Audio,
 136                           caps: 0 }
 137     });
 138     (audio-ll; $n:expr, $fn:expr) => ({
 139         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Audio,
 140                           caps: CODEC_CAP_LOSSLESS | CODEC_CAP_INTRAONLY }
 141     });
 142     (audio-hyb; $n:expr, $fn:expr) => ({
 143         CodecDescription{ name: $n, fname: $fn, ctype: CodecType::Audio,
 144                           caps: CODEC_CAP_HYBRID }
 145     });
 146 }
 147
 148 /// Returns codec description for the provided codec short name if it is found.
 149 pub fn get_codec_description(name: &str) -> Option<&'static CodecDescription> {
 150     CODEC_REGISTER.iter().find(|&reg| reg.name == name)
 151 }
 152
 153 static CODEC_REGISTER: &[CodecDescription] = &[
 154     desc!(audio-ll; "pcm", "PCM"),
 155     desc!(audio;    "alaw", "A-law PCM"),
 156     desc!(audio;    "ulaw", "mu-law PCM"),
 157
 158     desc!(video-im; "indeo1", "Intel Raw IF09"),
 159     desc!(video-im; "indeo2", "Intel Indeo 2"),
 160     desc!(video;    "indeo3", "Intel Indeo 3"),
 161     desc!(video;    "indeo4", "Intel Indeo 4", CODEC_CAP_REORDER | CODEC_CAP_SCALABLE),
 162     desc!(video;    "indeo5", "Intel Indeo 5", CODEC_CAP_REORDER | CODEC_CAP_SCALABLE),
 163     desc!(video;    "indeo5s", "Intel Indeo 5 Scalable", CODEC_CAP_SCALABLE),
 164     desc!(video;    "intel263", "Intel I263", CODEC_CAP_REORDER),
 165     desc!(audio;    "iac",    "Intel Indeo audio"),
 166     desc!(audio;    "imc",    "Intel Music Coder"),
 167
 168     desc!(video;    "realvideo1", "Real Video 1"),
 169     desc!(video;    "realvideo2", "Real Video 2", CODEC_CAP_REORDER),
 170     desc!(video;    "realvideo3", "Real Video 3", CODEC_CAP_REORDER),
 171     desc!(video;    "realvideo4", "Real Video 4", CODEC_CAP_REORDER),
 172     desc!(video;    "realvideo6", "Real Video 6", CODEC_CAP_REORDER),
 173     desc!(video;    "clearvideo", "ClearVideo"),
 174     desc!(video;    "clearvideo_rm", "ClearVideo"),
 175     desc!(audio;    "ra14.4",     "RealAudio 14.4"),
 176     desc!(audio;    "ra28.8",     "RealAudio 28.8"),
 177     desc!(audio;    "cook",       "RealAudio Cooker"),
 178     desc!(audio;    "ralf",       "RealAudio Lossless"),
 179     desc!(audio;    "aac",        "AAC"),
 180     desc!(audio;    "ac3",        "ETSI TS 102 366"),
 181     desc!(audio;    "atrac3",     "Sony Atrac3"),
 182     desc!(audio;    "sipro",      "Sipro Labs ADPCM"),
 183
 184
 185     desc!(video-ll; "rawvideo",   "Raw video data"),
 186     desc!(video-ll; "rawvideo-ms", "Raw video data"),
 187
 188     desc!(video;    "cinepak",    "Cinepak"),
 189
 190     desc!(video-llp; "zmbv",      "Zip Motion Blocks Video"),
 191
 192     desc!(video;    "msvideo1",      "MS Video 1"),
 193     desc!(video;    "msrle",         "MS RLE"),
 194     desc!(audio;    "ms-adpcm",      "MS ADPCM"),
 195     desc!(audio;    "ima-adpcm-ms",  "IMA ADPCM (MS variant)"),
 196
 197     desc!(video;    "qt-smc",               "Apple Graphics"),
 198     desc!(video;    "qt-rle",               "Apple Animation"),
 199     desc!(video;    "apple-video",          "Apple video"),
 200     desc!(video;    "sorenson-video",       "Sorenson Video"),
 201     desc!(video;    "sorenson-video3",      "Sorenson Video 3", CODEC_CAP_REORDER),
 202     desc!(audio-ll; "alac",                 "Apple Lossless Audio Codec"),
 203     desc!(audio;    "mace-3",               "MACE 3:1"),
 204     desc!(audio;    "mace-6",               "MACE 6:1"),
 205     desc!(audio;    "ima-adpcm-qt",         "IMA ADPCM (Apple variant)"),
 206     desc!(audio;    "qdesign-music",        "QDesign Music"),
 207     desc!(audio;    "qdesign-music2",       "QDesign Music v2"),
 208     desc!(audio;    "qualcomm-purevoice",   "Qualcomm PureVoice"),
 209
 210     desc!(video-ll; "arm_rawvideo",         "Acorn Replay Movie raw video formats"),
 211     desc!(video;    "movinglines",          "Acorn Moving Lines"),
 212     desc!(video;    "movingblocks",         "Acorn Moving Blocks"),
 213     desc!(video;    "movingblockshq",       "Acorn Moving Blocks HQ"),
 214     desc!(video;    "supermovingblocks",    "Acorn Super Moving Blocks"),
 215     desc!(video;    "linepack",             "Henrik Pedersen's LinePack"),
 216     desc!(video;    "movie16_3",            "Henrik Pedersen's Movie 16:3"),
 217     desc!(video;    "escape100",            "Eidos Escape 100"),
 218     desc!(video;    "escape102",            "Eidos Escape 102"),
 219     desc!(video;    "escape122",            "Eidos Escape 122"),
 220     desc!(video;    "escape124",            "Eidos Escape 124"),
 221     desc!(video;    "escape130",            "Eidos Escape 130"),
 222
 223     desc!(video;    "truemotion1",   "TrueMotion 1"),
 224     desc!(video-im; "truemotionrt",  "TrueMotion RT"),
 225     desc!(video;    "truemotion2",   "TrueMotion 2"),
 226     desc!(video;    "truemotion2x",  "TrueMotion 2X"),
 227     desc!(video;    "vp3",           "VP3"),
 228     desc!(video;    "vp4",           "VP4"),
 229     desc!(video;    "vp5",           "VP5"),
 230     desc!(video;    "vp6",           "VP6"),
 231     desc!(video;    "vp6f",          "VP6 (in Flash)"),
 232     desc!(video;    "vp6a",          "VP6 with alpha"),
 233     desc!(video;    "vp7",           "VP7"),
 234     desc!(video;    "vp8",           "VP8"),
 235     desc!(video;    "vp9",           "VP9"),
 236     desc!(audio;    "adpcm-dk3",     "Duck DK3 ADPCM"),
 237     desc!(audio;    "adpcm-dk4",     "Duck DK4 ADPCM"),
 238     desc!(audio;    "on2avc-500",    "On2 AVC"),
 239     desc!(audio;    "on2avc-501",    "On2 AVC"),
 240
 241     desc!(video;     "flv263",       "Sorenson H.263"),
 242     desc!(video-llp; "flashsv",      "Flash Screen Video"),
 243     desc!(video-llp; "flashsv2",     "Flash Screen Video 2"),
 244     desc!(audio;     "asao",         "N*llym*s*r ASAO"),
 245     desc!(audio;     "flv-adpcm",    "Flash ADPCM"),
 246
 247     desc!(audio;     "mp1",          "MPEG Audio Layer I"),
 248     desc!(audio;     "mp2",          "MPEG Audio Layer II"),
 249     desc!(audio;     "mp3",          "MPEG Audio Layer III"),
 250     desc!(audio;     "speex",        "Speex"),
 251
 252     desc!(video;    "gdv-video",     "Gremlin Digital Video - video"),
 253     desc!(audio;    "gdv-audio",     "Gremlin Digital Video - audio"),
 254     desc!(video-im; "arxel-video",   "Arxel Tribe Video"),
 255     desc!(video;    "beam-fcp",      "Beam Software Animation"),
 256     desc!(video;    "beam-video",    "Beam Software Video"),
 257     desc!(video;    "bmv-video",     "BMV video"),
 258     desc!(audio;    "bmv-audio",     "BMV audio"),
 259     desc!(video;    "bmv3-video",    "DW Noir BMV video"),
 260     desc!(audio;    "bmv3-audio",    "DW Noir BMV audio"),
 261     desc!(video;    "dp-sga",        "Digital Pictures SGA video"),
 262     desc!(video;    "fable-imax",    "Fable IMAX video"),
 263     desc!(video;    "fst-video",     "FutureVision video"),
 264     desc!(audio;    "fst-audio",     "FutureVision audio"),
 265     desc!(video;    "hl-fmv-video",  "Highlander FMV video"),
 266     desc!(video-llp; "ipma",         "Imagination Pilots Matte Animation"),
 267     desc!(video-llp; "ipma2",        "Imagination Pilots Matte Animation v2"),
 268     desc!(video;    "legend-q-video", "Legend Entertainment Q video"),
 269     desc!(video;    "midivid",       "MidiVid"),
 270     desc!(video;    "midivid3",      "MidiVid 3"),
 271     desc!(video-ll; "midivid-ll",    "MidiVid Lossless"),
 272     desc!(video;    "smushv1",       "SMUSH Video paletted"),
 273     desc!(video;    "smushv2",       "SMUSH Video 16-bit"),
 274     desc!(video;    "smush-iact",    "SMUSH IACT Audio"),
 275     desc!(video;    "smush-vima",    "SMUSH VIMA Audio"),
 276     desc!(video;    "vmd-video",     "VMD video"),
 277     desc!(audio;    "vmd-audio",     "VMD audio"),
 278     desc!(video;    "vxvideo",       "Actimagine Vx"),
 279     desc!(audio;    "vxaudio",       "Actimagine Sx"),
 280
 281     desc!(video;    "smacker-video", "Smacker video"),
 282     desc!(audio;    "smacker-audio", "Smacker audio"),
 283     desc!(video;    "bink-video",    "Bink video"),
 284     desc!(video;    "bink2-video",   "Bink2 video"),
 285     desc!(audio;    "bink-audio-dct",   "Bink audio (DCT)"),
 286     desc!(audio;    "bink-audio-rdft",  "Bink audio (RDFT)"),
 287
 288     desc!(audio;    "lhst15f8",      "L&H StreamTalk 15kbps at 8 kHz"),
 289     desc!(audio;    "lhst250f11",    "L&H StreamTalk 25kbps at 11 kHz"),
 290     desc!(audio;    "lhst500f22",    "L&H StreamTalk 50kpbs at 22 kHz"),
 291     desc!(audio;    "lhst48",        "L&H StreamTalk CELP Codec 4.8kbps at 8 kHz"),
 292
 293     desc!(video;    "vivo1",         "VivoActive Video 1.0"),
 294     desc!(video;    "vivo2",         "VivoActive Video 2.0", CODEC_CAP_REORDER),
 295     desc!(audio;    "g723.1",        "ITU G.723.1"),
 296     desc!(audio;    "siren",         "Polycom Siren"),
 297
 298     desc!(audio-ll;  "ape",          "Monkey's Audio"),
 299     desc!(audio-ll;  "flac",         "Free Lossless Audio Codec"),
 300     desc!(audio-ll;  "tta",          "True Audio codec"),
 301     desc!(audio-hyb; "wavpack",      "WavPack"),
 302
 303     desc!(video-ll; "gif",           "GIF"),
 304     desc!(video-im; "jpeg",          "JPEG"),
 305     desc!(video;    "h264",          "ITU H.264", CODEC_CAP_COMPLEX_REORDER | CODEC_CAP_HYBRID),
 306
 307     desc!(video-im; "mwv1",          "Aware MotionWavelets"),
 308 ];
 309
 310 static AVI_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 311     (&[1, 0, 0, 0], "msrle"),
 312     (&[2, 0, 0, 0], "msrle"),
 313
 314     (b"CRAM", "msvideo1"),
 315     (b"MSVC", "msvideo1"),
 316     (b"WHAM", "msvideo1"),
 317
 318     (b"MJPG", "jpeg"),
 319
 320     (b"IF09", "indeo1"),
 321     (b"RT21", "indeo2"),
 322     (b"IV31", "indeo3"),
 323     (b"IV32", "indeo3"),
 324     (b"IV41", "indeo4"),
 325     (b"IV50", "indeo5"),
 326     (b"I263", "intel263"),
 327
 328     (b"UCOD", "clearvideo"),
 329     (b"cvid", "cinepak"),
 330     (b"ZMBV", "zmbv"),
 331
 332     (b"Ipma", "ipma"),
 333     (b"Ip20", "ipma2"),
 334
 335     (b"MVDV", "midivid"),
 336     (b"MV30", "midivid3"),
 337     (b"MVLZ", "midivid-ll"),
 338
 339     (b"DUCK", "truemotion1"),
 340     (b"TR20", "truemotionrt"),
 341     (b"TM20", "truemotion2"),
 342     (b"TM2A", "truemotion2x"),
 343     (b"TM2X", "truemotion2x"),
 344     (b"VP30", "vp3"),
 345     (b"VP31", "vp3"),
 346     (b"VP40", "vp4"),
 347     (b"VP50", "vp5"),
 348     (b"VP60", "vp6"),
 349     (b"VP61", "vp6"),
 350     (b"VP62", "vp6"),
 351     (b"VP6A", "vp6a"),
 352     (b"VP70", "vp7"),
 353
 354     (b"MWV1", "mwv1"),
 355 ];
 356
 357 static WAV_CODEC_REGISTER: &[(u16, &str)] = &[
 358     (0x0000, "unknown"),
 359     (0x0001, "pcm"),
 360     (0x0002, "ms-adpcm"),
 361     (0x0003, "pcm"),
 362     (0x0011, "ima-adpcm-ms"),
 363     (0x0061, "adpcm-dk4"),
 364     (0x0062, "adpcm-dk3"),
 365     (0x0401, "imc"),
 366     (0x0402, "iac"),
 367     (0x0500, "on2avc-500"),
 368     (0x0501, "on2avc-501"),
 369 ];
 370
 371 static MOV_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 372     (b"cvid", "cinepak"),
 373     (b"jpeg", "jpeg"),
 374     //(b"raw ", "raw"),
 375     //(b"Yuv2", "raw"),
 376     (b"smc ", "qt-smc"),
 377     (b"rle ", "qt-rle"),
 378     (b"rpza", "apple-video"),
 379     (b"kpcd", "kodak-photocd"),
 380     //(b"mpeg", "mpeg-video"),
 381     (b"mjpa", "mjpeg-a"),
 382     (b"mjpb", "mjpeg-b"),
 383     (b"svqi", "sorenson-video"),
 384     (b"SVQ1", "sorenson-video"),
 385     (b"svq3", "sorenson-video3"),
 386     (b"SVQ3", "sorenson-video3"),
 387
 388     (b"IV31", "indeo3"),
 389     (b"IV32", "indeo3"),
 390
 391     (b"UCOD", "clearvideo"),
 392
 393     (b"VP30", "vp3"),
 394     (b"VP31", "vp3"),
 395
 396     (b"avc1", "h264"),
 397 ];
 398
 399 static MOV_AUDIO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 400     (b"NONE", "pcm"),
 401     (b"raw ", "pcm"),
 402     (b"twos", "pcm"),
 403     (b"sowt", "pcm"),
 404     (b"fl32", "pcm"),
 405     (b"fl64", "pcm"),
 406     (b"in24", "pcm"),
 407     (b"in32", "pcm"),
 408     (b"MAC3", "mace-3"),
 409     (b"MAC6", "mace-6"),
 410     (b"ima4", "ima-adpcm-qt"),
 411     (b"ulaw", "ulaw"),
 412     (b"alaw", "alaw"),
 413     (b"dvca", "dv-audio"),
 414     (b"QDMC", "qdesign-music"),
 415     (b"QDM2", "qdesign-music2"),
 416     (b"Qclp", "qualcomm-purevoice"),
 417     //(b".mp3", "mpeg-layer3"),
 418
 419     (b"mp4a", "aac"),
 420
 421     (b"alac", "alac"),
 422 ];
 423
 424 /// Returns video codec short name for provided FOURCC (used in AVI format).
 425 pub fn find_codec_from_avi_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 426     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 427         if *fourcc == fcc { return Some(name); }
 428     }
 429     None
 430 }
 431
 432 /// Returns FOURCC (used in AVI format) for provided codec name.
 433 pub fn find_avi_fourcc(codecname: &str) -> Option<[u8; 4]> {
 434     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 435         if *name == codecname { return Some(**fourcc); }
 436     }
 437     None
 438 }
 439
 440 /// Returns known audio codec short name for provided TWOCC (used in WAV and AVI format).
 441 pub fn find_codec_from_wav_twocc(tcc: u16) -> Option<&'static str> {
 442     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 443         if *twocc == tcc { return Some(name); }
 444     }
 445     None
 446 }
 447
 448 /// Returns TWOCC (used in WAV and AVI format for provided codec name.
 449 pub fn find_wav_twocc(codecname: &str) -> Option<u16> {
 450     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 451         if *name == codecname { return Some(*twocc); }
 452     }
 453     None
 454 }
 455
 456 /// Returns video codec short name for provided FOURCC (used in MOV format).
 457 pub fn find_codec_from_mov_video_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 458     for (fourcc, name) in MOV_VIDEO_CODEC_REGISTER.iter() {
 459         if *fourcc == fcc { return Some(name); }
 460     }
 461     None
 462 }
 463
 464 /// Returns known audio codec short name for provided FOURCC (used in MOV format).
 465 pub fn find_codec_from_mov_audio_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 466     for (fourcc, name) in MOV_AUDIO_CODEC_REGISTER.iter() {
 467         if *fourcc == fcc { return Some(name); }
 468     }
 469     None
 470 }
 471
 472 #[cfg(test)]
 473 mod test {
 474     use super::*;
 475
 476     #[test]
 477     fn test_register() {
 478         let c1 = find_codec_from_avi_fourcc(b"IV41").unwrap();
 479         let c2 = find_codec_from_wav_twocc(0x401).unwrap();
 480         println!("found {} and {}", c1, c2);
 481         let cd1 = get_codec_description(c1).unwrap();
 482         let cd2 = get_codec_description(c2).unwrap();
 483         println!("got {} and {}", cd1, cd2);
 484     }
 485 }