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!(audio;    "arm_rawaudio",         "Acorn Replay Movie raw audio formats"),
 212     desc!(video;    "movinglines",          "Acorn Moving Lines"),
 213     desc!(video;    "movingblocks",         "Acorn Moving Blocks"),
 214     desc!(video;    "movingblockshq",       "Acorn Moving Blocks HQ"),
 215     desc!(video;    "supermovingblocks",    "Acorn Super Moving Blocks"),
 216     desc!(video;    "linepack",             "Henrik Pedersen's LinePack"),
 217     desc!(video;    "movie16_3",            "Henrik Pedersen's Movie 16:3"),
 218     desc!(video;    "escape100",            "Eidos Escape 100"),
 219     desc!(video;    "escape102",            "Eidos Escape 102"),
 220     desc!(video;    "escape122",            "Eidos Escape 122"),
 221     desc!(video;    "escape124",            "Eidos Escape 124"),
 222     desc!(video;    "escape130",            "Eidos Escape 130"),
 223
 224     desc!(video;    "truemotion1",   "TrueMotion 1"),
 225     desc!(video-im; "truemotionrt",  "TrueMotion RT"),
 226     desc!(video;    "truemotion2",   "TrueMotion 2"),
 227     desc!(video;    "truemotion2x",  "TrueMotion 2X"),
 228     desc!(video;    "vp3",           "VP3"),
 229     desc!(video;    "vp4",           "VP4"),
 230     desc!(video;    "vp5",           "VP5"),
 231     desc!(video;    "vp6",           "VP6"),
 232     desc!(video;    "vp6f",          "VP6 (in Flash)"),
 233     desc!(video;    "vp6a",          "VP6 with alpha"),
 234     desc!(video;    "vp7",           "VP7"),
 235     desc!(video;    "vp8",           "VP8"),
 236     desc!(video;    "vp9",           "VP9"),
 237     desc!(audio;    "adpcm-dk3",     "Duck DK3 ADPCM"),
 238     desc!(audio;    "adpcm-dk4",     "Duck DK4 ADPCM"),
 239     desc!(audio;    "on2avc-500",    "On2 AVC"),
 240     desc!(audio;    "on2avc-501",    "On2 AVC"),
 241
 242     desc!(video;     "flv263",       "Sorenson H.263"),
 243     desc!(video-llp; "flashsv",      "Flash Screen Video"),
 244     desc!(video-llp; "flashsv2",     "Flash Screen Video 2"),
 245     desc!(audio;     "asao",         "N*llym*s*r ASAO"),
 246     desc!(audio;     "flv-adpcm",    "Flash ADPCM"),
 247
 248     desc!(audio;     "mp1",          "MPEG Audio Layer I"),
 249     desc!(audio;     "mp2",          "MPEG Audio Layer II"),
 250     desc!(audio;     "mp3",          "MPEG Audio Layer III"),
 251     desc!(audio;     "speex",        "Speex"),
 252
 253     desc!(video;    "gdv-video",     "Gremlin Digital Video - video"),
 254     desc!(audio;    "gdv-audio",     "Gremlin Digital Video - audio"),
 255     desc!(video-im; "arxel-video",   "Arxel Tribe Video"),
 256     desc!(video;    "beam-fcp",      "Beam Software Animation"),
 257     desc!(video;    "beam-video",    "Beam Software Video"),
 258     desc!(video;    "bmv-video",     "BMV video"),
 259     desc!(audio;    "bmv-audio",     "BMV audio"),
 260     desc!(video;    "bmv3-video",    "DW Noir BMV video"),
 261     desc!(audio;    "bmv3-audio",    "DW Noir BMV audio"),
 262     desc!(video;    "dp-sga",        "Digital Pictures SGA video"),
 263     desc!(video;    "fable-imax",    "Fable IMAX video"),
 264     desc!(video;    "fst-video",     "FutureVision video"),
 265     desc!(audio;    "fst-audio",     "FutureVision audio"),
 266     desc!(video;    "hl-fmv-video",  "Highlander FMV video"),
 267     desc!(video-llp; "ipma",         "Imagination Pilots Matte Animation"),
 268     desc!(video-llp; "ipma2",        "Imagination Pilots Matte Animation v2"),
 269     desc!(video;    "legend-q-video", "Legend Entertainment Q video"),
 270     desc!(video;    "midivid",       "MidiVid"),
 271     desc!(video;    "midivid3",      "MidiVid 3"),
 272     desc!(video-ll; "midivid-ll",    "MidiVid Lossless"),
 273     desc!(video-ll; "rbt-video",     "Sierra Robot video"),
 274     desc!(audio;    "rbt-audio",     "Sierra Robot audio"),
 275     desc!(video;    "seq-video",     "Sierra Sequence video"),
 276     desc!(video;    "smushv1",       "SMUSH Video paletted"),
 277     desc!(video;    "smushv2",       "SMUSH Video 16-bit"),
 278     desc!(video;    "smush-iact",    "SMUSH IACT Audio"),
 279     desc!(video;    "smush-vima",    "SMUSH VIMA Audio"),
 280     desc!(video;    "vmd-video",     "VMD video"),
 281     desc!(audio;    "vmd-audio",     "VMD audio"),
 282     desc!(video;    "vxvideo",       "Actimagine Vx"),
 283     desc!(audio;    "vxaudio",       "Actimagine Sx"),
 284
 285     desc!(video;    "smacker-video", "Smacker video"),
 286     desc!(audio;    "smacker-audio", "Smacker audio"),
 287     desc!(video;    "bink-video",    "Bink video"),
 288     desc!(video;    "bink2-video",   "Bink2 video"),
 289     desc!(audio;    "bink-audio-dct",   "Bink audio (DCT)"),
 290     desc!(audio;    "bink-audio-rdft",  "Bink audio (RDFT)"),
 291
 292     desc!(audio;    "lhst15f8",      "L&H StreamTalk 15kbps at 8 kHz"),
 293     desc!(audio;    "lhst250f11",    "L&H StreamTalk 25kbps at 11 kHz"),
 294     desc!(audio;    "lhst500f22",    "L&H StreamTalk 50kpbs at 22 kHz"),
 295     desc!(audio;    "lhst48",        "L&H StreamTalk CELP Codec 4.8kbps at 8 kHz"),
 296
 297     desc!(video;    "vivo1",         "VivoActive Video 1.0"),
 298     desc!(video;    "vivo2",         "VivoActive Video 2.0", CODEC_CAP_REORDER),
 299     desc!(audio;    "g723.1",        "ITU G.723.1"),
 300     desc!(audio;    "siren",         "Polycom Siren"),
 301
 302     desc!(audio-ll;  "ape",          "Monkey's Audio"),
 303     desc!(audio-ll;  "flac",         "Free Lossless Audio Codec"),
 304     desc!(audio-ll;  "tta",          "True Audio codec"),
 305     desc!(audio-hyb; "wavpack",      "WavPack"),
 306
 307     desc!(video-ll; "gif",           "GIF"),
 308     desc!(video-im; "jpeg",          "JPEG"),
 309     desc!(video;    "h264",          "ITU H.264", CODEC_CAP_COMPLEX_REORDER | CODEC_CAP_HYBRID),
 310
 311     desc!(video-im; "mwv1",          "Aware MotionWavelets"),
 312 ];
 313
 314 static AVI_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 315     (&[1, 0, 0, 0], "msrle"),
 316     (&[2, 0, 0, 0], "msrle"),
 317
 318     (b"CRAM", "msvideo1"),
 319     (b"MSVC", "msvideo1"),
 320     (b"WHAM", "msvideo1"),
 321
 322     (b"MJPG", "jpeg"),
 323
 324     (b"IF09", "indeo1"),
 325     (b"RT21", "indeo2"),
 326     (b"IV31", "indeo3"),
 327     (b"IV32", "indeo3"),
 328     (b"IV41", "indeo4"),
 329     (b"IV50", "indeo5"),
 330     (b"I263", "intel263"),
 331
 332     (b"UCOD", "clearvideo"),
 333     (b"cvid", "cinepak"),
 334     (b"ZMBV", "zmbv"),
 335
 336     (b"Ipma", "ipma"),
 337     (b"Ip20", "ipma2"),
 338
 339     (b"MVDV", "midivid"),
 340     (b"MV30", "midivid3"),
 341     (b"MVLZ", "midivid-ll"),
 342
 343     (b"tmot", "truemotion1"),
 344     (b"DUCK", "truemotion1"),
 345     (b"TR20", "truemotionrt"),
 346     (b"TM20", "truemotion2"),
 347     (b"TM2A", "truemotion2x"),
 348     (b"TM2X", "truemotion2x"),
 349     (b"VP30", "vp3"),
 350     (b"VP31", "vp3"),
 351     (b"VP40", "vp4"),
 352     (b"VP50", "vp5"),
 353     (b"VP60", "vp6"),
 354     (b"VP61", "vp6"),
 355     (b"VP62", "vp6"),
 356     (b"VP6A", "vp6a"),
 357     (b"VP70", "vp7"),
 358
 359     (b"MWV1", "mwv1"),
 360 ];
 361
 362 static WAV_CODEC_REGISTER: &[(u16, &str)] = &[
 363     (0x0000, "unknown"),
 364     (0x0001, "pcm"),
 365     (0x0002, "ms-adpcm"),
 366     (0x0003, "pcm"),
 367     (0x0011, "ima-adpcm-ms"),
 368     (0x0061, "adpcm-dk4"),
 369     (0x0062, "adpcm-dk3"),
 370     (0x0401, "imc"),
 371     (0x0402, "iac"),
 372     (0x0500, "on2avc-500"),
 373     (0x0501, "on2avc-501"),
 374 ];
 375
 376 static MOV_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 377     (b"cvid", "cinepak"),
 378     (b"jpeg", "jpeg"),
 379     //(b"raw ", "raw"),
 380     //(b"Yuv2", "raw"),
 381     (b"smc ", "qt-smc"),
 382     (b"rle ", "qt-rle"),
 383     (b"rpza", "apple-video"),
 384     (b"kpcd", "kodak-photocd"),
 385     //(b"mpeg", "mpeg-video"),
 386     (b"mjpa", "mjpeg-a"),
 387     (b"mjpb", "mjpeg-b"),
 388     (b"svqi", "sorenson-video"),
 389     (b"SVQ1", "sorenson-video"),
 390     (b"svq3", "sorenson-video3"),
 391     (b"SVQ3", "sorenson-video3"),
 392
 393     (b"IV31", "indeo3"),
 394     (b"IV32", "indeo3"),
 395
 396     (b"UCOD", "clearvideo"),
 397
 398     (b"VP30", "vp3"),
 399     (b"VP31", "vp3"),
 400
 401     (b"avc1", "h264"),
 402 ];
 403
 404 static MOV_AUDIO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 405     (b"NONE", "pcm"),
 406     (b"raw ", "pcm"),
 407     (b"twos", "pcm"),
 408     (b"sowt", "pcm"),
 409     (b"fl32", "pcm"),
 410     (b"fl64", "pcm"),
 411     (b"in24", "pcm"),
 412     (b"in32", "pcm"),
 413     (b"MAC3", "mace-3"),
 414     (b"MAC6", "mace-6"),
 415     (b"ima4", "ima-adpcm-qt"),
 416     (b"ulaw", "ulaw"),
 417     (b"alaw", "alaw"),
 418     (b"dvca", "dv-audio"),
 419     (b"QDMC", "qdesign-music"),
 420     (b"QDM2", "qdesign-music2"),
 421     (b"Qclp", "qualcomm-purevoice"),
 422     //(b".mp3", "mpeg-layer3"),
 423
 424     (b"mp4a", "aac"),
 425
 426     (b"alac", "alac"),
 427 ];
 428
 429 /// Returns video codec short name for provided FOURCC (used in AVI format).
 430 pub fn find_codec_from_avi_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 431     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 432         if *fourcc == fcc { return Some(name); }
 433     }
 434     None
 435 }
 436
 437 /// Returns FOURCC (used in AVI format) for provided codec name.
 438 pub fn find_avi_fourcc(codecname: &str) -> Option<[u8; 4]> {
 439     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 440         if *name == codecname { return Some(**fourcc); }
 441     }
 442     None
 443 }
 444
 445 /// Returns known audio codec short name for provided TWOCC (used in WAV and AVI format).
 446 pub fn find_codec_from_wav_twocc(tcc: u16) -> Option<&'static str> {
 447     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 448         if *twocc == tcc { return Some(name); }
 449     }
 450     None
 451 }
 452
 453 /// Returns TWOCC (used in WAV and AVI format for provided codec name.
 454 pub fn find_wav_twocc(codecname: &str) -> Option<u16> {
 455     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 456         if *name == codecname { return Some(*twocc); }
 457     }
 458     None
 459 }
 460
 461 /// Returns video codec short name for provided FOURCC (used in MOV format).
 462 pub fn find_codec_from_mov_video_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 463     for (fourcc, name) in MOV_VIDEO_CODEC_REGISTER.iter() {
 464         if *fourcc == fcc { return Some(name); }
 465     }
 466     None
 467 }
 468
 469 /// Returns known audio codec short name for provided FOURCC (used in MOV format).
 470 pub fn find_codec_from_mov_audio_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 471     for (fourcc, name) in MOV_AUDIO_CODEC_REGISTER.iter() {
 472         if *fourcc == fcc { return Some(name); }
 473     }
 474     None
 475 }
 476
 477 #[cfg(test)]
 478 mod test {
 479     use super::*;
 480
 481     #[test]
 482     fn test_register() {
 483         let c1 = find_codec_from_avi_fourcc(b"IV41").unwrap();
 484         let c2 = find_codec_from_wav_twocc(0x401).unwrap();
 485         println!("found {} and {}", c1, c2);
 486         let cd1 = get_codec_description(c1).unwrap();
 487         let cd2 = get_codec_description(c2).unwrap();
 488         println!("got {} and {}", cd1, cd2);
 489     }
 490 }