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;    "indeo2", "Intel Indeo 2"),
 160     desc!(video;    "ima-rtv2", "Intel RTV 2 (Indeo 2)"),
 161     desc!(video;    "indeo3", "Intel Indeo 3"),
 162     desc!(video;    "indeo4", "Intel Indeo 4", CODEC_CAP_REORDER | CODEC_CAP_SCALABLE),
 163     desc!(video;    "indeo5", "Intel Indeo 5", CODEC_CAP_REORDER | CODEC_CAP_SCALABLE),
 164     desc!(video;    "indeo5s", "Intel Indeo 5 Scalable", CODEC_CAP_SCALABLE),
 165     desc!(video;    "intel263", "Intel I263", CODEC_CAP_REORDER),
 166     desc!(audio;    "iac",    "Intel Indeo audio"),
 167     desc!(audio;    "imc",    "Intel Music Coder"),
 168
 169     desc!(video;    "realvideo1", "Real Video 1"),
 170     desc!(video;    "realvideo2", "Real Video 2", CODEC_CAP_REORDER),
 171     desc!(video;    "realvideo3", "Real Video 3", CODEC_CAP_REORDER),
 172     desc!(video;    "realvideo4", "Real Video 4", CODEC_CAP_REORDER),
 173     desc!(video;    "realvideo6", "Real Video 6", CODEC_CAP_REORDER),
 174     desc!(video;    "clearvideo", "ClearVideo"),
 175     desc!(video;    "clearvideo_rm", "ClearVideo"),
 176     desc!(audio;    "ra14.4",     "RealAudio 14.4"),
 177     desc!(audio;    "ra28.8",     "RealAudio 28.8"),
 178     desc!(audio;    "cook",       "RealAudio Cooker"),
 179     desc!(audio;    "ralf",       "RealAudio Lossless"),
 180     desc!(audio;    "aac",        "AAC"),
 181     desc!(audio;    "ac3",        "ETSI TS 102 366"),
 182     desc!(audio;    "atrac3",     "Sony Atrac3"),
 183     desc!(audio;    "sipro",      "Sipro Labs ADPCM"),
 184
 185
 186     desc!(video-ll; "rawvideo",   "Raw video data"),
 187     desc!(video-ll; "rawvideo-ms", "Raw video data"),
 188
 189     desc!(video;    "cinepak",    "Cinepak"),
 190
 191     desc!(video-llp; "zmbv",      "Zip Motion Blocks Video"),
 192
 193     desc!(video;    "msvideo1",      "MS Video 1"),
 194     desc!(video;    "msrle",         "MS RLE"),
 195     desc!(audio;    "ms-adpcm",      "MS ADPCM"),
 196     desc!(audio;    "ima-adpcm-ms",  "IMA ADPCM (MS variant)"),
 197
 198     desc!(video;    "qt-smc",               "Apple Graphics"),
 199     desc!(video;    "qt-rle",               "Apple Animation"),
 200     desc!(video;    "apple-video",          "Apple video"),
 201     desc!(video;    "sorenson-video",       "Sorenson Video"),
 202     desc!(video;    "sorenson-video3",      "Sorenson Video 3", CODEC_CAP_REORDER),
 203     desc!(audio-ll; "alac",                 "Apple Lossless Audio Codec"),
 204     desc!(audio;    "mace-3",               "MACE 3:1"),
 205     desc!(audio;    "mace-6",               "MACE 6:1"),
 206     desc!(audio;    "ima-adpcm-qt",         "IMA ADPCM (Apple variant)"),
 207     desc!(audio;    "qdesign-music",        "QDesign Music"),
 208     desc!(audio;    "qdesign-music2",       "QDesign Music v2"),
 209     desc!(audio;    "qualcomm-purevoice",   "Qualcomm PureVoice"),
 210
 211     desc!(video-ll; "arm_rawvideo",         "Acorn Replay Movie raw video formats"),
 212     desc!(audio;    "arm_rawaudio",         "Acorn Replay Movie raw audio formats"),
 213     desc!(video;    "movinglines",          "Acorn Moving Lines"),
 214     desc!(video;    "movingblocks",         "Acorn Moving Blocks"),
 215     desc!(video;    "movingblockshq",       "Acorn Moving Blocks HQ"),
 216     desc!(video;    "supermovingblocks",    "Acorn Super Moving Blocks"),
 217     desc!(video;    "linepack",             "Henrik Pedersen's LinePack"),
 218     desc!(video;    "movie16_3",            "Henrik Pedersen's Movie 16:3"),
 219     desc!(video;    "escape100",            "Eidos Escape 100"),
 220     desc!(video;    "escape102",            "Eidos Escape 102"),
 221     desc!(video;    "escape122",            "Eidos Escape 122"),
 222     desc!(video;    "escape124",            "Eidos Escape 124"),
 223     desc!(video;    "escape130",            "Eidos Escape 130"),
 224
 225     desc!(video;    "truemotion1",   "TrueMotion 1"),
 226     desc!(video-im; "truemotionrt",  "TrueMotion RT"),
 227     desc!(video;    "truemotion2",   "TrueMotion 2"),
 228     desc!(video;    "truemotion2x",  "TrueMotion 2X"),
 229     desc!(video;    "vp3",           "VP3"),
 230     desc!(video;    "vp4",           "VP4"),
 231     desc!(video;    "vp5",           "VP5"),
 232     desc!(video;    "vp6",           "VP6"),
 233     desc!(video;    "vp6f",          "VP6 (in Flash)"),
 234     desc!(video;    "vp6a",          "VP6 with alpha"),
 235     desc!(video;    "vp7",           "VP7"),
 236     desc!(video;    "vp8",           "VP8"),
 237     desc!(video;    "vp9",           "VP9"),
 238     desc!(audio;    "adpcm-dk3",     "Duck DK3 ADPCM"),
 239     desc!(audio;    "adpcm-dk4",     "Duck DK4 ADPCM"),
 240     desc!(audio;    "on2avc-500",    "On2 AVC"),
 241     desc!(audio;    "on2avc-501",    "On2 AVC"),
 242
 243     desc!(video;     "flv263",       "Sorenson H.263"),
 244     desc!(video-llp; "flashsv",      "Flash Screen Video"),
 245     desc!(video-llp; "flashsv2",     "Flash Screen Video 2"),
 246     desc!(audio;     "asao",         "N*llym*s*r ASAO"),
 247     desc!(audio;     "flv-adpcm",    "Flash ADPCM"),
 248
 249     desc!(audio;     "mp1",          "MPEG Audio Layer I"),
 250     desc!(audio;     "mp2",          "MPEG Audio Layer II"),
 251     desc!(audio;     "mp3",          "MPEG Audio Layer III"),
 252     desc!(audio;     "speex",        "Speex"),
 253
 254     desc!(video;    "gdv-video",     "Gremlin Digital Video - video"),
 255     desc!(audio;    "gdv-audio",     "Gremlin Digital Video - audio"),
 256     desc!(video-im; "arxel-video",   "Arxel Tribe Video"),
 257     desc!(video;    "beam-fcp",      "Beam Software Animation"),
 258     desc!(video;    "beam-video",    "Beam Software Video"),
 259     desc!(video;    "bmv-video",     "BMV video"),
 260     desc!(audio;    "bmv-audio",     "BMV audio"),
 261     desc!(video;    "bmv3-video",    "DW Noir BMV video"),
 262     desc!(audio;    "bmv3-audio",    "DW Noir BMV audio"),
 263     desc!(video;    "dp-sga",        "Digital Pictures SGA video"),
 264     desc!(video;    "fable-imax",    "Fable IMAX video"),
 265     desc!(video;    "fst-video",     "FutureVision video"),
 266     desc!(audio;    "fst-audio",     "FutureVision audio"),
 267     desc!(video;    "hl-fmv-video",  "Highlander FMV video"),
 268     desc!(video-llp; "ipma",         "Imagination Pilots Matte Animation"),
 269     desc!(video-llp; "ipma2",        "Imagination Pilots Matte Animation v2"),
 270     desc!(video;    "kmvc",          "Karl Morton's Video Codec"),
 271     desc!(video;    "legend-q-video", "Legend Entertainment Q video"),
 272     desc!(video;    "midivid",       "MidiVid"),
 273     desc!(video;    "midivid3",      "MidiVid 3"),
 274     desc!(video-ll; "midivid-ll",    "MidiVid Lossless"),
 275     desc!(video-ll; "rbt-video",     "Sierra Robot video"),
 276     desc!(audio;    "rbt-audio",     "Sierra Robot audio"),
 277     desc!(video;    "seq-video",     "Sierra Sequence video"),
 278     desc!(video;    "smushv1",       "SMUSH Video paletted"),
 279     desc!(video;    "smushv2",       "SMUSH Video 16-bit"),
 280     desc!(video;    "smush-iact",    "SMUSH IACT Audio"),
 281     desc!(video;    "smush-vima",    "SMUSH VIMA Audio"),
 282     desc!(video;    "vmd-video",     "VMD video"),
 283     desc!(audio;    "vmd-audio",     "VMD audio"),
 284     desc!(video;    "vxvideo",       "Actimagine Vx"),
 285     desc!(audio;    "vxaudio",       "Actimagine Sx"),
 286
 287     desc!(video;    "smacker-video", "Smacker video"),
 288     desc!(audio;    "smacker-audio", "Smacker audio"),
 289     desc!(video;    "bink-video",    "Bink video"),
 290     desc!(video;    "bink2-video",   "Bink2 video"),
 291     desc!(audio;    "bink-audio-dct",   "Bink audio (DCT)"),
 292     desc!(audio;    "bink-audio-rdft",  "Bink audio (RDFT)"),
 293
 294     desc!(audio;    "lhst15f8",      "L&H StreamTalk 15kbps at 8 kHz"),
 295     desc!(audio;    "lhst250f11",    "L&H StreamTalk 25kbps at 11 kHz"),
 296     desc!(audio;    "lhst500f22",    "L&H StreamTalk 50kpbs at 22 kHz"),
 297     desc!(audio;    "lhst48",        "L&H StreamTalk CELP Codec 4.8kbps at 8 kHz"),
 298
 299     desc!(video;    "vivo1",         "VivoActive Video 1.0"),
 300     desc!(video;    "vivo2",         "VivoActive Video 2.0", CODEC_CAP_REORDER),
 301     desc!(audio;    "g723.1",        "ITU G.723.1"),
 302     desc!(audio;    "siren",         "Polycom Siren"),
 303
 304     desc!(audio-ll;  "ape",          "Monkey's Audio"),
 305     desc!(audio-ll;  "flac",         "Free Lossless Audio Codec"),
 306     desc!(audio-ll;  "tta",          "True Audio codec"),
 307     desc!(audio-hyb; "wavpack",      "WavPack"),
 308
 309     desc!(video-ll; "gif",           "GIF"),
 310     desc!(video-im; "jpeg",          "JPEG"),
 311     desc!(video;    "h264",          "ITU H.264", CODEC_CAP_COMPLEX_REORDER | CODEC_CAP_HYBRID),
 312     desc!(video-modern; "mpeg4asp",  "MPEG-4 ASP"),
 313
 314     desc!(video-im; "mwv1",          "Aware MotionWavelets"),
 315
 316     desc!(video-im; "pgvv",          "Radius Studio Video"),
 317 ];
 318
 319 static AVI_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 320     (&[1, 0, 0, 0], "msrle"),
 321     (&[2, 0, 0, 0], "msrle"),
 322
 323     (b"CRAM", "msvideo1"),
 324     (b"MSVC", "msvideo1"),
 325     (b"WHAM", "msvideo1"),
 326
 327     (b"MJPG", "jpeg"),
 328
 329     (b"IF09", "indeo1"),
 330     (b"RT21", "indeo2"),
 331     (b"IV31", "indeo3"),
 332     (b"IV32", "indeo3"),
 333     (b"IV41", "indeo4"),
 334     (b"IV50", "indeo5"),
 335     (b"I263", "intel263"),
 336
 337     (b"UCOD", "clearvideo"),
 338     (b"cvid", "cinepak"),
 339     (b"ZMBV", "zmbv"),
 340
 341     (b"Ipma", "ipma"),
 342     (b"Ip20", "ipma2"),
 343     (b"KMVC", "kmvc"),
 344
 345     (b"MVDV", "midivid"),
 346     (b"MV30", "midivid3"),
 347     (b"MVLZ", "midivid-ll"),
 348
 349     (b"tmot", "truemotion1"),
 350     (b"DUCK", "truemotion1"),
 351     (b"TR20", "truemotionrt"),
 352     (b"TM20", "truemotion2"),
 353     (b"TM2A", "truemotion2x"),
 354     (b"TM2X", "truemotion2x"),
 355     (b"VP30", "vp3"),
 356     (b"VP31", "vp3"),
 357     (b"VP40", "vp4"),
 358     (b"VP50", "vp5"),
 359     (b"VP60", "vp6"),
 360     (b"VP61", "vp6"),
 361     (b"VP62", "vp6"),
 362     (b"VP6A", "vp6a"),
 363     (b"VP70", "vp7"),
 364
 365     (b"MWV1", "mwv1"),
 366
 367     (b"azpr", "apple-video"),
 368     (b"PGVV", "pgvv"),
 369
 370     (b"VXS1", "vxvideo"),
 371
 372     (b"DX50", "mpeg4asp"),
 373     (b"DIVX", "mpeg4asp"),
 374     (b"XVID", "mpeg4asp"),
 375 ];
 376
 377 static WAV_CODEC_REGISTER: &[(u16, &str)] = &[
 378     (0x0000, "unknown"),
 379     (0x0001, "pcm"),
 380     (0x0002, "ms-adpcm"),
 381     (0x0003, "pcm"),
 382     (0x0011, "ima-adpcm-ms"),
 383     (0x0055, "mp3"),
 384     (0x0061, "adpcm-dk4"),
 385     (0x0062, "adpcm-dk3"),
 386     (0x0401, "imc"),
 387     (0x0402, "iac"),
 388     (0x0500, "on2avc-500"),
 389     (0x0501, "on2avc-501"),
 390 ];
 391
 392 static MOV_VIDEO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 393     (b"cvid", "cinepak"),
 394     (b"jpeg", "jpeg"),
 395     //(b"raw ", "raw"),
 396     //(b"Yuv2", "raw"),
 397     (b"smc ", "qt-smc"),
 398     (b"rle ", "qt-rle"),
 399     (b"rpza", "apple-video"),
 400     (b"kpcd", "kodak-photocd"),
 401     //(b"mpeg", "mpeg-video"),
 402     (b"mjpa", "mjpeg-a"),
 403     (b"mjpb", "mjpeg-b"),
 404     (b"svqi", "sorenson-video"),
 405     (b"SVQ1", "sorenson-video"),
 406     (b"svq3", "sorenson-video3"),
 407     (b"SVQ3", "sorenson-video3"),
 408
 409     (b"IV31", "indeo3"),
 410     (b"IV32", "indeo3"),
 411
 412     (b"UCOD", "clearvideo"),
 413
 414     (b"VP30", "vp3"),
 415     (b"VP31", "vp3"),
 416
 417     (b"mp4v", "mpeg4asp"),
 418     (b"avc1", "h264"),
 419 ];
 420
 421 static MOV_AUDIO_CODEC_REGISTER: &[(&[u8;4], &str)] = &[
 422     (b"NONE", "pcm"),
 423     (b"raw ", "pcm"),
 424     (b"twos", "pcm"),
 425     (b"sowt", "pcm"),
 426     (b"fl32", "pcm"),
 427     (b"fl64", "pcm"),
 428     (b"in24", "pcm"),
 429     (b"in32", "pcm"),
 430     (b"MAC3", "mace-3"),
 431     (b"MAC6", "mace-6"),
 432     (b"ima4", "ima-adpcm-qt"),
 433     (b"ulaw", "ulaw"),
 434     (b"alaw", "alaw"),
 435     (b"dvca", "dv-audio"),
 436     (b"QDMC", "qdesign-music"),
 437     (b"QDM2", "qdesign-music2"),
 438     (b"Qclp", "qualcomm-purevoice"),
 439     //(b".mp3", "mpeg-layer3"),
 440
 441     (b"mp4a", "aac"),
 442
 443     (b"alac", "alac"),
 444 ];
 445
 446 /// Returns video codec short name for provided FOURCC (used in AVI format).
 447 pub fn find_codec_from_avi_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 448     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 449         if *fourcc == fcc { return Some(name); }
 450     }
 451     None
 452 }
 453
 454 /// Returns FOURCC (used in AVI format) for provided codec name.
 455 pub fn find_avi_fourcc(codecname: &str) -> Option<[u8; 4]> {
 456     for (fourcc, name) in AVI_VIDEO_CODEC_REGISTER.iter() {
 457         if *name == codecname { return Some(**fourcc); }
 458     }
 459     None
 460 }
 461
 462 /// Returns known audio codec short name for provided TWOCC (used in WAV and AVI format).
 463 pub fn find_codec_from_wav_twocc(tcc: u16) -> Option<&'static str> {
 464     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 465         if *twocc == tcc { return Some(name); }
 466     }
 467     None
 468 }
 469
 470 /// Returns TWOCC (used in WAV and AVI format for provided codec name.
 471 pub fn find_wav_twocc(codecname: &str) -> Option<u16> {
 472     for (twocc, name) in WAV_CODEC_REGISTER.iter() {
 473         if *name == codecname { return Some(*twocc); }
 474     }
 475     None
 476 }
 477
 478 /// Returns video codec short name for provided FOURCC (used in MOV format).
 479 pub fn find_codec_from_mov_video_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 480     for (fourcc, name) in MOV_VIDEO_CODEC_REGISTER.iter() {
 481         if *fourcc == fcc { return Some(name); }
 482     }
 483     None
 484 }
 485
 486 /// Returns known audio codec short name for provided FOURCC (used in MOV format).
 487 pub fn find_codec_from_mov_audio_fourcc(fcc: &[u8;4]) -> Option<&'static str> {
 488     for (fourcc, name) in MOV_AUDIO_CODEC_REGISTER.iter() {
 489         if *fourcc == fcc { return Some(name); }
 490     }
 491     None
 492 }
 493
 494 #[cfg(test)]
 495 mod test {
 496     use super::*;
 497
 498     #[test]
 499     fn test_register() {
 500         let c1 = find_codec_from_avi_fourcc(b"IV41").unwrap();
 501         let c2 = find_codec_from_wav_twocc(0x401).unwrap();
 502         println!("found {} and {}", c1, c2);
 503         let cd1 = get_codec_description(c1).unwrap();
 504         let cd2 = get_codec_description(c2).unwrap();
 505         println!("got {} and {}", cd1, cd2);
 506     }
 507 }