src/main.rs

   1 extern crate nihav_core;
   2 extern crate nihav_codec_support;
   3 extern crate nihav_registry;
   4 extern crate nihav_allstuff;
   5
   6 use std::fs::File;
   7 use nihav_core::io::byteio::{FileReader, ByteReader};
   8 use nihav_core::frame::*;
   9 use nihav_core::options::*;
  10 use nihav_core::codecs::*;
  11 use nihav_core::demuxers::*;
  12 use nihav_core::muxers::*;
  13 use nihav_core::scale::*;
  14 use nihav_core::soundcvt::*;
  15 use nihav_registry::detect;
  16 use nihav_allstuff::*;
  17 use std::env;
  18
  19 fn print_options(name: &str, options: &[NAOptionDefinition]) {
  20     if options.is_empty() {
  21         println!("No custom options.");
  22     } else {
  23         println!("Options for '{}'", name);
  24         for opt in options.iter() {
  25             println!(" {}", opt);
  26         }
  27     }
  28 }
  29
  30 struct OptionArgs {
  31     name:   String,
  32     value:  Option<String>,
  33 }
  34
  35 struct InputStreamOptions {
  36     id:             u32,
  37     drop:           bool,
  38     dec_opts:       Vec<OptionArgs>,
  39 }
  40
  41 struct OutputStreamOptions {
  42     id:             u32,
  43     enc_params:     EncodeParameters,
  44     enc_name:       String,
  45     enc_opts:       Vec<OptionArgs>,
  46 }
  47
  48 enum OutputConvert {
  49     Video(NAScale, NABufferType),
  50     Audio(NAAudioInfo, NAChannelMap),
  51     None,
  52 }
  53
  54 enum OutputMode {
  55     Drop,
  56     Copy(u32),
  57     Encode(u32, Box<dyn NAEncoder>, OutputConvert),
  58 }
  59
  60 #[derive(Default)]
  61 struct Transcoder {
  62     input_name:     String,
  63     input_fmt:      Option<String>,
  64     output_name:    String,
  65     output_fmt:     Option<String>,
  66     demux_opts:     Vec<OptionArgs>,
  67     mux_opts:       Vec<OptionArgs>,
  68     istr_opts:      Vec<InputStreamOptions>,
  69     ostr_opts:      Vec<OutputStreamOptions>,
  70     decoders:       Vec<Option<(Box<NADecoderSupport>, Box<dyn NADecoder>)>>,
  71     encoders:       Vec<OutputMode>,
  72     no_video:       bool,
  73     no_audio:       bool,
  74 }
  75
  76 macro_rules! parse_and_apply_options {
  77     ($obj: expr, $in_opts: expr, $name: expr) => {
  78         let mut opts = Vec::with_capacity($in_opts.len());
  79         let opt_def = $obj.get_supported_options();
  80         for opt in $in_opts.iter() {
  81             let mut found = false;
  82             for opt_def in opt_def.iter() {
  83                 if opt.name == opt_def.name {
  84                     let arg = if let Some(ref str) = opt.value { Some(str) } else { None };
  85                     let ret = opt_def.parse(&opt.name, arg);
  86                     if ret.is_err() {
  87                         println!("invalid option {} for {}", opt.name, $name);
  88                     } else {
  89                         let (val, _) = ret.unwrap();
  90                         opts.push(val);
  91                     }
  92                     found = true;
  93                 }
  94             }
  95             if !found {
  96                 println!("  ignoring option '{}' for {}", opt.name, $name);
  97             }
  98         }
  99         $obj.set_options(opts.as_slice());
 100     }
 101 }
 102
 103 impl Transcoder {
 104     fn new() -> Self { Self::default() }
 105     fn parse_istream_options(&mut self, opt0: &str, opt1: &str) -> bool {
 106         let (_, strno) = opt0.split_at(9);
 107         let ret = strno.parse::<u32>();
 108         if ret.is_err() { return false; }
 109         let streamno = ret.unwrap();
 110
 111         let sidx = if let Some(idx) = self.istr_opts.iter().position(|str| str.id == streamno) {
 112                 idx
 113             } else {
 114                 self.istr_opts.push(InputStreamOptions {id: streamno, drop: false, dec_opts: Vec::new() });
 115                 self.istr_opts.len() - 1
 116             };
 117         let istr = &mut self.istr_opts[sidx];
 118
 119         for opt in opt1.split(',') {
 120             let oval: Vec<_> = opt.split('=').collect();
 121             if oval.len() == 1 {
 122                 match oval[0] {
 123                     "drop" => { istr.drop = true; },
 124                     _ => {
 125                         istr.dec_opts.push(OptionArgs{ name: oval[0].to_string(), value: None });
 126                     },
 127                 };
 128             } else if oval.len() == 2 {
 129                 istr.dec_opts.push(OptionArgs{ name: oval[0].to_string(), value: Some(oval[1].to_string()) });
 130             } else {
 131                 println!("unrecognized option '{}'", opt);
 132             }
 133         }
 134         true
 135     }
 136     fn parse_ostream_options(&mut self, opt0: &str, opt1: &str, enc_reg: &RegisteredEncoders) -> bool {
 137         let (_, strno) = opt0.split_at(9);
 138         let ret = strno.parse::<u32>();
 139         if ret.is_err() { return false; }
 140         let streamno = ret.unwrap();
 141
 142         let sidx = if let Some(idx) = self.ostr_opts.iter().position(|str| str.id == streamno) {
 143                 idx
 144             } else {
 145                 self.ostr_opts.push(OutputStreamOptions {id: streamno, enc_name: String::new(), enc_params: EncodeParameters::default(), enc_opts: Vec::new() });
 146                 self.ostr_opts.len() - 1
 147             };
 148         let ostr = &mut self.ostr_opts[sidx];
 149
 150         for opt in opt1.split(',') {
 151             let oval: Vec<_> = opt.split('=').collect();
 152             if oval.len() == 1 {
 153                 match oval[0] {
 154                     "flip" => {
 155                         if ostr.enc_params.format == NACodecTypeInfo::None {
 156                             ostr.enc_params.format = NACodecTypeInfo::Video(NAVideoInfo::new(0, 0, false, YUV420_FORMAT));
 157                         }
 158                         if let NACodecTypeInfo::Video(ref mut vinfo) = ostr.enc_params.format {
 159                             vinfo.flipped = true;
 160                         } else {
 161                             println!("video option for audio stream");
 162                         }
 163                     },
 164                     "noflip" => {
 165                         if ostr.enc_params.format == NACodecTypeInfo::None {
 166                             ostr.enc_params.format = NACodecTypeInfo::Video(NAVideoInfo::new(0, 0, false, YUV420_FORMAT));
 167                         }
 168                         if let NACodecTypeInfo::Video(ref mut vinfo) = ostr.enc_params.format {
 169                             vinfo.flipped = false;
 170                         } else {
 171                             println!("video option for audio stream");
 172                         }
 173                     },
 174                     _ => {
 175                         ostr.enc_opts.push(OptionArgs{ name: oval[0].to_string(), value: None });
 176                     },
 177                 };
 178             } else if oval.len() == 2 {
 179 //todo parse encoder options, store, init later
 180                 match oval[0] {
 181                     "encoder" => {
 182                         if enc_reg.find_encoder(oval[1]).is_some() {
 183                             ostr.enc_name = oval[1].to_string();
 184                         } else {
 185                             println!("unknown encoder '{}'", oval[1]);
 186                         }
 187                     },
 188                     "width" => {
 189                         if ostr.enc_params.format == NACodecTypeInfo::None {
 190                             ostr.enc_params.format = NACodecTypeInfo::Video(NAVideoInfo::new(0, 0, false, YUV420_FORMAT));
 191                         }
 192                         if let NACodecTypeInfo::Video(ref mut vinfo) = ostr.enc_params.format {
 193                             let ret = oval[1].parse::<usize>();
 194                             if let Ok(val) = ret {
 195                                 vinfo.width = val;
 196                             } else {
 197                                 println!("invalid width");
 198                             }
 199                         } else {
 200                             println!("video option for audio stream");
 201                         }
 202                     },
 203                     "height" => {
 204                         if ostr.enc_params.format == NACodecTypeInfo::None {
 205                             ostr.enc_params.format = NACodecTypeInfo::Video(NAVideoInfo::new(0, 0, false, YUV420_FORMAT));
 206                         }
 207                         if let NACodecTypeInfo::Video(ref mut vinfo) = ostr.enc_params.format {
 208                             let ret = oval[1].parse::<usize>();
 209                             if let Ok(val) = ret {
 210                                 vinfo.height = val;
 211                             } else {
 212                                 println!("invalid height");
 213                             }
 214                         } else {
 215                             println!("video option for audio stream");
 216                         }
 217                     },
 218 //todo formaton
 219                     "srate" => {
 220                         if ostr.enc_params.format == NACodecTypeInfo::None {
 221                             ostr.enc_params.format = NACodecTypeInfo::Audio(NAAudioInfo::new(0, 0, SND_S16_FORMAT, 0));
 222                         }
 223                         if let NACodecTypeInfo::Audio(ref mut ainfo) = ostr.enc_params.format {
 224                             let ret = oval[1].parse::<u32>();
 225                             if let Ok(val) = ret {
 226                                 ainfo.sample_rate = val;
 227                             } else {
 228                                 println!("invalid sampling rate");
 229                             }
 230                         } else {
 231                             println!("audio option for video stream");
 232                         }
 233                     },
 234                     "channels" => {
 235                         if ostr.enc_params.format == NACodecTypeInfo::None {
 236                             ostr.enc_params.format = NACodecTypeInfo::Audio(NAAudioInfo::new(0, 0, SND_S16_FORMAT, 0));
 237                         }
 238                         if let NACodecTypeInfo::Audio(ref mut ainfo) = ostr.enc_params.format {
 239                             let ret = oval[1].parse::<u8>();
 240                             if let Ok(val) = ret {
 241                                 ainfo.channels = val;
 242                             } else {
 243                                 println!("invalid number of channels");
 244                             }
 245                         } else {
 246                             println!("audio option for video stream");
 247                         }
 248                     },
 249                     "block_len" => {
 250                         if ostr.enc_params.format == NACodecTypeInfo::None {
 251                             ostr.enc_params.format = NACodecTypeInfo::Audio(NAAudioInfo::new(0, 0, SND_S16_FORMAT, 0));
 252                         }
 253                         if let NACodecTypeInfo::Audio(ref mut ainfo) = ostr.enc_params.format {
 254                             let ret = oval[1].parse::<usize>();
 255                             if let Ok(val) = ret {
 256                                 ainfo.block_len = val;
 257                             } else {
 258                                 println!("invalid block_length");
 259                             }
 260                         } else {
 261                             println!("audio option for video stream");
 262                         }
 263                     },
 264 //todo soniton, channel map
 265                     "bitrate" => {
 266                         let ret = oval[1].parse::<u32>();
 267                         if let Ok(val) = ret {
 268                             ostr.enc_params.bitrate = val;
 269                         } else {
 270                             println!("invalid bitrate value");
 271                         }
 272                     },
 273                     "quality" => {
 274                         let ret = oval[1].parse::<u8>();
 275                         if let Ok(val) = ret {
 276                             ostr.enc_params.quality = val;
 277                         } else {
 278                             println!("invalid quality value");
 279                         }
 280                     },
 281                     _ => {
 282                         ostr.enc_opts.push(OptionArgs{ name: oval[0].to_string(), value: Some(oval[1].to_string()) });
 283                     },
 284                 }
 285             } else {
 286                 println!("unrecognized option '{}'", opt);
 287             }
 288         }
 289         true
 290     }
 291     fn parse_demuxer_options(&mut self, opts: &str, dmx_reg: &RegisteredDemuxers) -> bool {
 292         for opt in opts.split(',') {
 293             let oval: Vec<_> = opt.split('=').collect();
 294             if oval.len() == 1 {
 295                 self.demux_opts.push(OptionArgs{ name: oval[0].to_string(), value: None });
 296             } else if oval.len() == 2 {
 297                 if oval[0] == "format" {
 298                     if dmx_reg.find_demuxer(oval[1]).is_some() {
 299                         self.input_fmt = Some(oval[1].to_string());
 300                     } else {
 301                         println!("unknown demuxer format '{}'", oval[1]);
 302                     }
 303                 } else {
 304                     self.demux_opts.push(OptionArgs{ name: oval[0].to_string(), value: Some(oval[1].to_string()) });
 305                 }
 306             } else {
 307                 println!("unrecognized option '{}'", opt);
 308             }
 309         }
 310         true
 311     }
 312     fn parse_muxer_options(&mut self, opts: &str, mux_reg: &RegisteredMuxers) -> bool {
 313         for opt in opts.split(',') {
 314             let oval: Vec<_> = opt.split('=').collect();
 315             if oval.len() == 1 {
 316                 self.mux_opts.push(OptionArgs{ name: oval[0].to_string(), value: None });
 317             } else if oval.len() == 2 {
 318                 if oval[0] == "format" {
 319                     if mux_reg.find_muxer(oval[1]).is_some() {
 320                         self.output_fmt = Some(oval[1].to_string());
 321                     } else {
 322                         println!("unknown muxer format '{}'", oval[1]);
 323                     }
 324                 } else {
 325                     self.mux_opts.push(OptionArgs{ name: oval[0].to_string(), value: Some(oval[1].to_string()) });
 326                 }
 327             } else {
 328                 println!("unrecognized option '{}'", opt);
 329             }
 330         }
 331         true
 332     }
 333     fn apply_decoder_options(&self, dec: &mut NADecoder, str_id: u32) {
 334         if let Some(str_idx) = self.istr_opts.iter().position(|str| str.id == str_id) {
 335             let dec_opts = dec.get_supported_options();
 336             if dec_opts.is_empty() { return; }
 337             let name = format!("input stream {}", str_id);
 338             parse_and_apply_options!(dec, &self.istr_opts[str_idx].dec_opts, name);
 339         }
 340     }
 341     fn register_output_stream(&mut self, cname: &str, istr: NAStreamRef, out_sm: &mut StreamManager, enc_reg: &RegisteredEncoders) -> bool {
 342         let out_id = out_sm.get_num_streams() as u32;
 343         if let Some(str_idx) = self.istr_opts.iter().position(|str| str.id == (istr.get_num() as u32)) {
 344             if self.istr_opts[str_idx].drop {
 345                 self.encoders.push(OutputMode::Drop);
 346                 return true;
 347             }
 348         }
 349
 350         if let Some(str_idx) = self.ostr_opts.iter().position(|str| str.id == out_id) {
 351             let oopts = &mut self.ostr_opts[str_idx];
 352             if cname == "copy" && istr.get_info().get_name() == cname {
 353                 self.encoders.push(OutputMode::Copy(out_id));
 354             } else if cname == "any" || oopts.enc_name.as_str() == cname {
 355                 let enc_create = enc_reg.find_encoder(oopts.enc_name.as_str());
 356                 if enc_create.is_none() {
 357                     println!("encoder '{}' not found", oopts.enc_name.as_str());
 358                     return false;
 359                 }
 360                 let mut encoder = (enc_create.unwrap())();
 361                 if oopts.enc_params.format == NACodecTypeInfo::None {
 362                     oopts.enc_params.format = istr.get_info().get_properties();
 363                 }
 364                 if oopts.enc_params.tb_num == 0 {
 365                     oopts.enc_params.tb_num = istr.tb_num;
 366                     oopts.enc_params.tb_den = istr.tb_den;
 367                 }
 368                 let ret_eparams = encoder.negotiate_format(&oopts.enc_params);
 369                 if ret_eparams.is_err() {
 370                     println!("cannot negotiate encoding parameters");
 371                     return false;
 372                 }
 373                 let ret_eparams = ret_eparams.unwrap();
 374
 375 //todo check for params mismatch
 376                 let cvt = match (&oopts.enc_params.format, &ret_eparams.format) {
 377                         (NACodecTypeInfo::Video(svinfo), NACodecTypeInfo::Video(dvinfo)) => {
 378                             if svinfo == dvinfo {
 379                                 OutputConvert::None
 380                             } else {
 381                                 let ofmt = ScaleInfo { fmt: dvinfo.format, width: dvinfo.width, height: dvinfo.height };
 382                                 let ret = NAScale::new(ofmt, ofmt);
 383                                 if ret.is_err() {
 384                                     println!("cannot create scaler");
 385                                     return false;
 386                                 }
 387                                 let scaler = ret.unwrap();
 388                                 let ret = alloc_video_buffer(*dvinfo, 4);
 389                                 if ret.is_err() {
 390                                     println!("cannot create scaler buffer");
 391                                     return false;
 392                                 }
 393                                 let cvt_buf = ret.unwrap();
 394                                 OutputConvert::Video(scaler, cvt_buf)
 395                             }
 396                         },
 397                         (NACodecTypeInfo::Audio(sainfo), NACodecTypeInfo::Audio(dainfo)) => {
 398                             if sainfo == dainfo {
 399                                 OutputConvert::None
 400                             } else {
 401                                 let dchmap = match dainfo.channels {
 402                                         1 => NAChannelMap::from_ms_mapping(0x4),
 403                                         2 => NAChannelMap::from_ms_mapping(0x3),
 404                                         _ => {
 405 println!("can't generate default channel map for {} channels", dainfo.channels);
 406                                             return false;
 407                                         },
 408                                     };
 409 //todo channelmap
 410                                 OutputConvert::Audio(*dainfo, dchmap)
 411                             }
 412                         },
 413                         _ => OutputConvert::None,
 414                     };
 415                 let ret = encoder.init(out_id, ret_eparams);
 416                 if ret.is_err() {
 417                     println!("error initialising encoder");
 418                     return false;
 419                 }
 420                 out_sm.add_stream_ref(ret.unwrap());
 421
 422                 let name = format!("output stream {}", out_id);
 423                 parse_and_apply_options!(encoder, &oopts.enc_opts, name);
 424
 425                 self.encoders.push(OutputMode::Encode(out_id, encoder, cvt));
 426             } else {
 427 println!("encoder {} is not supported by output (expected {})", istr.id, istr.get_info().get_name());
 428                 return false;
 429             }
 430         } else {
 431             if cname == "any" || istr.get_info().get_name() == cname {
 432                 self.encoders.push(OutputMode::Copy(out_id));
 433             } else {
 434 println!("stream {} ({}) can't be handled", istr.id, istr.get_info().get_name());
 435 // todo autoselect encoder?
 436                 return false;
 437             }
 438         }
 439         true
 440     }
 441     fn map_single(&mut self, cname: &str, ctype: StreamType, src_sm: &StreamManager, out_sm: &mut StreamManager, enc_reg: &RegisteredEncoders) -> bool {
 442         let mut found_stream = false;
 443         for istr in src_sm.iter() {
 444             if istr.get_media_type() != ctype || found_stream {
 445                 self.encoders.push(OutputMode::Drop);
 446             } else {
 447                 if !self.register_output_stream(cname, istr, out_sm, enc_reg) {
 448                     return false;
 449                 }
 450                 found_stream = true;
 451             }
 452         }
 453         found_stream
 454     }
 455     fn negotiate_stream_map(&mut self, src_sm: &StreamManager, mux_caps: MuxerCapabilities, out_sm: &mut StreamManager, enc_reg: &RegisteredEncoders) -> bool {
 456         match mux_caps {
 457             MuxerCapabilities::SingleVideo(cname) => {
 458                 if self.no_video { return false; }
 459                 self.map_single(cname, StreamType::Video, src_sm, out_sm, enc_reg)
 460             },
 461             MuxerCapabilities::SingleAudio(cname) => {
 462                 if self.no_audio { return false; }
 463                 self.map_single(cname, StreamType::Audio, src_sm, out_sm, enc_reg)
 464             },
 465             MuxerCapabilities::SingleVideoAndAudio(vname, aname) => {
 466                 let mut found_vid = false;
 467                 let mut found_aud = false;
 468                 for istr in src_sm.iter() {
 469                     if istr.get_media_type() == StreamType::Video && !found_vid && !self.no_video {
 470                         if !self.register_output_stream(vname, istr, out_sm, enc_reg) {
 471                             return false;
 472                         }
 473                         found_vid = true;
 474                     } else if istr.get_media_type() == StreamType::Audio && !found_aud && !self.no_audio {
 475                         if !self.register_output_stream(aname, istr, out_sm, enc_reg) {
 476                             return false;
 477                         }
 478                         found_aud = true;
 479                     } else {
 480                         self.encoders.push(OutputMode::Drop);
 481                     }
 482                 }
 483                 found_vid | found_aud
 484             },
 485             MuxerCapabilities::OnlyVideo => {
 486                 if self.no_video { return false; }
 487
 488                 let mut found_vid = false;
 489                 for istr in src_sm.iter() {
 490                     if istr.get_media_type() == StreamType::Video && !found_vid {
 491                         if !self.register_output_stream("any", istr, out_sm, enc_reg) {
 492                             return false;
 493                         }
 494                         found_vid = true;
 495                     } else {
 496                         self.encoders.push(OutputMode::Drop);
 497                     }
 498                 }
 499                 found_vid
 500             },
 501             MuxerCapabilities::OnlyAudio => {
 502                 if self.no_audio { return false; }
 503
 504                 let mut found_aud = false;
 505                 for istr in src_sm.iter() {
 506                     if istr.get_media_type() == StreamType::Audio && !found_aud {
 507                         if !self.register_output_stream("any", istr, out_sm, enc_reg) {
 508                             return false;
 509                         }
 510                         found_aud = true;
 511                     } else {
 512                         self.encoders.push(OutputMode::Drop);
 513                     }
 514                 }
 515                 found_aud
 516             },
 517             MuxerCapabilities::Universal => {
 518                 for istr in src_sm.iter() {
 519                     if (istr.get_media_type() == StreamType::Video && self.no_video) ||
 520                         (istr.get_media_type() == StreamType::Audio && self.no_audio) {
 521                         self.encoders.push(OutputMode::Drop);
 522                         continue;
 523                     }
 524                     if !self.register_output_stream("any", istr, out_sm, enc_reg) {
 525                         return false;
 526                     }
 527                 }
 528                 true
 529             },
 530         }
 531     }
 532 }
 533
 534 macro_rules! next_arg {
 535     ($args: expr, $arg_idx: expr) => {
 536         if $arg_idx + 1 >= $args.len() {
 537             println!("codec name is required");
 538         }
 539         $arg_idx += 1;
 540     }
 541 }
 542
 543 fn main() {
 544     let args: Vec<_> = env::args().collect();
 545
 546     if args.len() == 1 {
 547         println!("usage: nihav-encoder [-noout] [-vn] [-an] input [lastpts]");
 548         return;
 549     }
 550
 551     let mut dmx_reg = RegisteredDemuxers::new();
 552     nihav_register_all_demuxers(&mut dmx_reg);
 553     let mut dec_reg = RegisteredDecoders::new();
 554     nihav_register_all_codecs(&mut dec_reg);
 555
 556     let mut mux_reg = RegisteredMuxers::new();
 557     nihav_register_all_muxers(&mut mux_reg);
 558     let mut enc_reg = RegisteredEncoders::new();
 559     nihav_register_all_encoders(&mut enc_reg);
 560
 561     let mut transcoder = Transcoder::new();
 562
 563     let mut arg_idx = 1;
 564     while arg_idx < args.len() {
 565         match args[arg_idx].as_str() {
 566             "--query-decoder-options" => {
 567                 next_arg!(args, arg_idx);
 568                 let cname = args[arg_idx].as_str();
 569                 if let Some(decfunc) = dec_reg.find_decoder(cname) {
 570                     let dec = (decfunc)();
 571                     let opts = dec.get_supported_options();
 572                     print_options(cname, opts);
 573                 } else {
 574                     println!("codec {} is not found", cname);
 575                 }
 576             },
 577             "--query-demuxer-options" => {
 578                 next_arg!(args, arg_idx);
 579                 let dname = args[arg_idx].as_str();
 580                 let mut mr = MemoryReader::new_read(&[]);
 581                 let mut br = ByteReader::new(&mut mr);
 582                 if let Some(dmx_creator) = dmx_reg.find_demuxer(dname) {
 583                     let dmx = dmx_creator.new_demuxer(&mut br);
 584                     let opts = dmx.get_supported_options();
 585                     print_options(dname, opts);
 586                 } else {
 587                     println!("demuxer {} is not found", dname);
 588                 }
 589             },
 590             "--query-encoder-options" => {
 591                 next_arg!(args, arg_idx);
 592                 let cname = args[arg_idx].as_str();
 593                 if let Some(encfunc) = enc_reg.find_encoder(cname) {
 594                     let enc = (encfunc)();
 595                     let opts = enc.get_supported_options();
 596                     print_options(cname, opts);
 597                 } else {
 598                     println!("codec {} is not found", cname);
 599                 }
 600             },
 601             "--query-muxer-options" => {
 602                 next_arg!(args, arg_idx);
 603                 let name = args[arg_idx].as_str();
 604                 let mut data = [];
 605                 let mut mw = MemoryWriter::new_write(&mut data);
 606                 let mut bw = ByteWriter::new(&mut mw);
 607                 if let Some(mux_creator) = mux_reg.find_muxer(name) {
 608                     let mux = mux_creator.new_muxer(&mut bw);
 609                     let opts = mux.get_supported_options();
 610                     print_options(name, opts);
 611                 } else {
 612                     println!("muxer {} is not found", name);
 613                 }
 614             },
 615             "--input" => {
 616                 next_arg!(args, arg_idx);
 617                 transcoder.input_name = args[arg_idx].clone();
 618             },
 619             "--input-format" => {
 620                 next_arg!(args, arg_idx);
 621                 transcoder.input_fmt = Some(args[arg_idx].clone());
 622             },
 623             "--output" => {
 624                 next_arg!(args, arg_idx);
 625                 transcoder.output_name = args[arg_idx].clone();
 626             },
 627             "--output-format" => {
 628                 next_arg!(args, arg_idx);
 629                 transcoder.output_fmt = Some(args[arg_idx].clone());
 630             },
 631             "--demuxer-options" => {
 632                 next_arg!(args, arg_idx);
 633                 if !transcoder.parse_demuxer_options(&args[arg_idx], &dmx_reg) {
 634                     println!("invalid demuxer option syntax");
 635                     return;
 636                 }
 637             },
 638             "--no-video" => {
 639                 transcoder.no_video = true;
 640             },
 641             "--no-audio" => {
 642                 transcoder.no_audio = true;
 643             },
 644             "--muxer-options" => {
 645                 next_arg!(args, arg_idx);
 646                 if !transcoder.parse_muxer_options(&args[arg_idx], &mux_reg) {
 647                     println!("invalid muxer option syntax");
 648                     return;
 649                 }
 650             },
 651             _ => {
 652                 if args[arg_idx].starts_with("--istream") {
 653                     let opt0 = &args[arg_idx];
 654                     next_arg!(args, arg_idx);
 655                     if !transcoder.parse_istream_options(opt0, &args[arg_idx]) {
 656                         println!("invalid input stream option syntax");
 657                         return;
 658                     }
 659                 } else if args[arg_idx].starts_with("--ostream") {
 660                     let opt0 = &args[arg_idx];
 661                     next_arg!(args, arg_idx);
 662                     if !transcoder.parse_ostream_options(opt0, &args[arg_idx], &enc_reg) {
 663                         println!("invalid output stream option syntax");
 664                         return;
 665                     }
 666                 } else if args[arg_idx].starts_with("--") {
 667                     println!("unknown option");
 668                 } else {
 669                     println!("unrecognized argument");
 670                 }
 671             },
 672         };
 673         arg_idx += 1;
 674     }
 675
 676     if transcoder.input_name.len() == 0 {
 677         println!("no input name provided");
 678         return;
 679     }
 680     if transcoder.output_name.len() == 0 {
 681         println!("no output name provided");
 682         return;
 683     }
 684
 685     let res = File::open(transcoder.input_name.as_str());
 686     if res.is_err() {
 687         println!("error opening input");
 688         return;
 689     }
 690     let mut file = res.unwrap();
 691     let mut fr = FileReader::new_read(&mut file);
 692     let mut br = ByteReader::new(&mut fr);
 693
 694     let dmx_name = if let Some(ref str) = transcoder.input_fmt {
 695             str.as_str()
 696         } else {
 697             if let Some((dmx_name, score)) = detect::detect_format(transcoder.input_name.as_str(), &mut br) {
 698                 println!("detected {} with score {:?}", dmx_name, score);
 699                 dmx_name
 700             } else {
 701                 println!("cannot detect input format");
 702                 return;
 703             }
 704         };
 705     let ret = dmx_reg.find_demuxer(dmx_name);
 706     if ret.is_none() {
 707         println!("cannot find demuxer for '{}'", dmx_name);
 708         return;
 709     }
 710     let dmx_fact = ret.unwrap();
 711     br.seek(SeekFrom::Start(0)).unwrap();
 712     let mut dmx = create_demuxer(dmx_fact, &mut br).unwrap();
 713     parse_and_apply_options!(dmx, &transcoder.demux_opts, "input");
 714     for i in 0..dmx.get_num_streams() {
 715         let s = dmx.get_stream(i).unwrap();
 716         let info = s.get_info();
 717         let decfunc = dec_reg.find_decoder(info.get_name());
 718 println!("stream {} - {} {}", i, s, info.get_name());
 719         let str_id = s.get_num() as u32;
 720         if let Some(create_dec) = decfunc {
 721             let mut dec = (create_dec)();
 722             let mut dsupp = Box::new(NADecoderSupport::new());
 723             let ret = dec.init(&mut dsupp, info.clone());
 724             if ret.is_err() {
 725                 println!("Error initialising decoder '{}' for stream {}", info.get_name(), str_id);
 726                 return;
 727             }
 728             transcoder.apply_decoder_options(dec.as_mut(), str_id);
 729             transcoder.decoders.push(Some((dsupp, dec)));
 730         } else {
 731             println!("No decoder for stream {} ({}) is found", str_id, info.get_name());
 732             transcoder.decoders.push(None);
 733         }
 734     }
 735
 736     let output_fmt = if let Some(ref str) = transcoder.output_fmt {
 737             str
 738         } else {
 739             if let Some(str) = detect::detect_format_by_name(transcoder.output_name.as_str()) {
 740                 str
 741             } else {
 742                 println!("Cannot guess muxer for output");
 743                 return;
 744             }
 745         };
 746     let ret = mux_reg.find_muxer(output_fmt);
 747     let ofmt = output_fmt.to_string();
 748
 749     if ret.is_none() {
 750         println!("cannot find muxer '{}'", output_fmt);
 751     }
 752     let mux_creator = ret.unwrap();
 753
 754     let mux_caps = mux_creator.get_capabilities();
 755     let mut out_sm = StreamManager::new();
 756     if !transcoder.negotiate_stream_map(dmx.get_stream_manager(), mux_caps, &mut out_sm, &enc_reg) {
 757         println!("cannot determine stream map");
 758         return;
 759     }
 760
 761     let ret = File::create(transcoder.output_name.as_str());
 762     if ret.is_err() {
 763         println!("cannot open output file");
 764         return;
 765     }
 766     let mut fw = FileWriter::new_write(ret.unwrap());
 767     let mut bw = ByteWriter::new(&mut fw);
 768     let ret = create_muxer(mux_creator, out_sm, &mut bw);
 769     if let Err(err) = ret {
 770         println!("cannot create muxer instance {:?}", err);
 771         return;
 772     }
 773     let mut mux = ret.unwrap();
 774     parse_and_apply_options!(mux, &transcoder.mux_opts, "output");
 775
 776     println!("Output {} muxer {}", transcoder.output_name, ofmt);
 777     for ostr in mux.get_streams() {
 778         println!(" #{}: {} {}", ostr.get_num(), ostr, ostr.get_info().get_name());
 779     }
 780
 781     loop {
 782         let pktres = dmx.get_frame();
 783         if let Err(DemuxerError::EOF) = pktres { break; }
 784         if pktres.is_err() {
 785             println!("demuxing error");
 786             break;
 787         }
 788         let mut pkt = pktres.unwrap();
 789         let src_id = pkt.get_stream().get_num();
 790         match transcoder.encoders[src_id] {
 791             OutputMode::Drop => {},
 792             OutputMode::Copy(dst_id) => {
 793                 let dstr = mux.get_stream(dst_id as usize).unwrap();
 794                 pkt.reassign(dstr, pkt.get_time_information());
 795                 if mux.mux_frame(pkt).is_err() {
 796                     println!("error muxing packet");
 797                     break;
 798                 }
 799             },
 800             OutputMode::Encode(dst_id, ref mut encoder, ref mut cvt) => {
 801                 if let Some((ref mut dsupp, ref mut decoder)) = transcoder.decoders[src_id] {
 802                     let ret = decoder.decode(dsupp, &pkt);
 803                     if ret.is_err() {
 804                         println!("error decoding stream {}", src_id);
 805                         break;
 806                     }
 807                     let frm = ret.unwrap();
 808                     let buf = frm.get_buffer();
 809                     let cbuf = match cvt {
 810                             OutputConvert::None => buf,
 811                             OutputConvert::Video(ref mut scaler, ref mut dbuf) => {
 812                                 let cur_ifmt = get_scale_fmt_from_pic(&buf);
 813                                 let last_ifmt = scaler.get_in_fmt();
 814                                 if cur_ifmt != last_ifmt {
 815                                     let ofmt = scaler.get_out_fmt();
 816                                     let ret = NAScale::new(cur_ifmt, ofmt);
 817                                     if ret.is_err() {
 818                                         println!("error re-initialising scaler for {} -> {}", cur_ifmt, ofmt);
 819                                         break;
 820                                     }
 821                                     *scaler = ret.unwrap();
 822                                 }
 823                                 let ret = scaler.convert(&buf, dbuf);
 824                                 if ret.is_err() {
 825                                     println!("error converting frame for encoding");
 826                                     break;
 827                                 }
 828                                 dbuf.clone()
 829                             },
 830                             OutputConvert::Audio(ref dinfo, ref dchmap) => {
 831                                 let ret = convert_audio_frame(&buf, dinfo, dchmap);
 832                                 if ret.is_err() {
 833                                     println!("error converting audio for stream {}", dst_id);
 834                                     break;
 835                                 }
 836                                 ret.unwrap()
 837                             },
 838                         };
 839                     let cfrm = NAFrame::new(frm.get_time_information(), frm.frame_type, frm.key, frm.get_info(), cbuf);
 840                     encoder.encode(&cfrm).unwrap();
 841                     while let Ok(Some(pkt)) = encoder.get_packet() {
 842                         mux.mux_frame(pkt).unwrap();
 843                     }
 844                 } else {
 845                     println!("no decoder for stream {}", src_id);
 846                     break;
 847                 }
 848             },
 849         };
 850     }
 851     'flush_loop: for enc in transcoder.encoders.iter_mut() {
 852         match enc {
 853             OutputMode::Encode(str_id, ref mut encoder, _) => {
 854                 let ret = encoder.flush();
 855                 if ret.is_err() {
 856                     println!("error flushing encoder for stream {}", str_id);
 857                     break;
 858                 } else {
 859                     while let Ok(Some(pkt)) = encoder.get_packet() {
 860                         if mux.mux_frame(pkt).is_err() {
 861                             println!("error muxing packet");
 862                             break 'flush_loop;
 863                         }
 864                     }
 865                 }
 866             },
 867             _ => {},
 868         };
 869     }
 870
 871     let ret = mux.end();
 872     if ret.is_err() {
 873         println!("error at finalising muxing");
 874     }
 875 }