src/demuxers/mod.rs

   1 use std::rc::Rc;
   2 use frame::*;
   3 use io::byteio::*;
   4
   5 #[derive(Debug,Clone,Copy,PartialEq)]
   6 #[allow(dead_code)]
   7 pub enum DemuxerError {
   8     EOF,
   9     NoSuchInput,
  10     InvalidData,
  11     IOError,
  12     NotImplemented,
  13     MemoryError,
  14 }
  15
  16 type DemuxerResult<T> = Result<T, DemuxerError>;
  17
  18 pub trait DemuxCore<'a> {
  19     fn open(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<()>;
  20     fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket>;
  21     fn seek(&mut self, time: u64) -> DemuxerResult<()>;
  22 }
  23
  24 pub trait NAPacketReader {
  25     fn read_packet(&mut self, str: Rc<NAStream>, ts: NATimeInfo, keyframe: bool, size: usize) -> DemuxerResult<NAPacket>;
  26     fn fill_packet(&mut self, pkt: &mut NAPacket) -> DemuxerResult<()>;
  27 }
  28
  29 impl<'a> NAPacketReader for ByteReader<'a> {
  30     fn read_packet(&mut self, str: Rc<NAStream>, ts: NATimeInfo, kf: bool, size: usize) -> DemuxerResult<NAPacket> {
  31         let mut buf: Vec<u8> = Vec::with_capacity(size);
  32         if buf.capacity() < size { return Err(DemuxerError::MemoryError); }
  33         buf.resize(size, 0);
  34         let res = self.read_buf(buf.as_mut_slice());
  35         if let Err(_) = res { return Err(DemuxerError::IOError); }
  36         let pkt = NAPacket::new(str, ts, kf, buf);
  37         Ok(pkt)
  38     }
  39     fn fill_packet(&mut self, pkt: &mut NAPacket) -> DemuxerResult<()> {
  40         let mut refbuf = pkt.get_buffer();
  41         let mut buf = Rc::make_mut(&mut refbuf);
  42         let res = self.read_buf(buf.as_mut_slice());
  43         if let Err(_) = res { return Err(DemuxerError::IOError); }
  44         Ok(())
  45     }
  46 }
  47
  48 pub struct StreamManager {
  49     streams: Vec<Rc<NAStream>>,
  50     ignored: Vec<bool>,
  51     no_ign:  bool,
  52 }
  53
  54 impl StreamManager {
  55     pub fn new() -> Self {
  56         StreamManager {
  57             streams: Vec::new(),
  58             ignored: Vec::new(),
  59             no_ign:  true,
  60         }
  61     }
  62     pub fn iter(&self) -> StreamIter { StreamIter::new(&self.streams) }
  63
  64     pub fn add_stream(&mut self, stream: NAStream) -> Option<usize> {
  65         let stream_num = self.streams.len();
  66         let mut str = stream.clone();
  67         str.set_num(stream_num);
  68         self.streams.push(Rc::new(str));
  69         self.ignored.push(false);
  70         Some(stream_num)
  71     }
  72     pub fn get_stream(&self, idx: usize) -> Option<Rc<NAStream>> {
  73         if idx < self.streams.len() {
  74             Some(self.streams[idx].clone())
  75         } else {
  76             None
  77         }
  78     }
  79     pub fn get_stream_by_id(&self, id: u32) -> Option<Rc<NAStream>> {
  80         for i in 0..self.streams.len() {
  81             if self.streams[i].get_id() == id {
  82                 return Some(self.streams[i].clone());
  83             }
  84         }
  85         None
  86     }
  87     pub fn get_num_streams(&self) -> usize { self.streams.len() }
  88     pub fn is_ignored(&self, idx: usize) -> bool {
  89         if self.no_ign {
  90             true
  91         } else if idx < self.ignored.len() {
  92             self.ignored[idx]
  93         } else {
  94             false
  95         }
  96     }
  97     pub fn is_ignored_id(&self, id: u32) -> bool {
  98         for i in 0..self.streams.len() {
  99             if self.streams[i].get_id() == id {
 100                 return self.ignored[i];
 101             }
 102         }
 103         false
 104     }
 105     pub fn set_ignored(&mut self, idx: usize) {
 106         if idx < self.ignored.len() {
 107             self.ignored[idx] = true;
 108             self.no_ign = false;
 109         }
 110     }
 111     pub fn set_unignored(&mut self, idx: usize) {
 112         if idx < self.ignored.len() {
 113             self.ignored[idx] = false;
 114         }
 115     }
 116 }
 117
 118 pub struct StreamIter<'a> {
 119     streams:    &'a Vec<Rc<NAStream>>,
 120     pos:        usize,
 121 }
 122
 123 impl<'a> StreamIter<'a> {
 124     pub fn new(streams: &'a Vec<Rc<NAStream>>) -> Self {
 125         StreamIter { streams: streams, pos: 0 }
 126     }
 127 }
 128
 129 impl<'a> Iterator for StreamIter<'a> {
 130     type Item = Rc<NAStream>;
 131
 132     fn next(&mut self) -> Option<Self::Item> {
 133         if self.pos >= self.streams.len() { return None; }
 134         let ret = self.streams[self.pos].clone();
 135         self.pos += 1;
 136         Some(ret)
 137     }
 138 }
 139
 140 pub struct Demuxer<'a> {
 141     dmx:        Box<DemuxCore<'a> + 'a>,
 142     streams:    StreamManager,
 143 }
 144
 145 impl<'a> Demuxer<'a> {
 146     fn new(dmx: Box<DemuxCore<'a> + 'a>, str: StreamManager) -> Self {
 147         Demuxer {
 148             dmx:        dmx,
 149             streams:    str,
 150         }
 151     }
 152     pub fn get_stream(&self, idx: usize) -> Option<Rc<NAStream>> {
 153         self.streams.get_stream(idx)
 154     }
 155     pub fn get_stream_by_id(&self, id: u32) -> Option<Rc<NAStream>> {
 156         self.streams.get_stream_by_id(id)
 157     }
 158     pub fn get_num_streams(&self) -> usize {
 159         self.streams.get_num_streams()
 160     }
 161     pub fn get_streams(&self) -> StreamIter {
 162         self.streams.iter()
 163     }
 164     pub fn is_ignored_stream(&self, idx: usize) -> bool {
 165         self.streams.is_ignored(idx)
 166     }
 167     pub fn set_ignored_stream(&mut self, idx: usize) {
 168         self.streams.set_ignored(idx)
 169     }
 170     pub fn set_unignored_stream(&mut self, idx: usize) {
 171         self.streams.set_unignored(idx)
 172     }
 173
 174     pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
 175         loop {
 176             let res = self.dmx.get_frame(&mut self.streams);
 177             if self.streams.no_ign || res.is_err() { return res; }
 178             let res = res.unwrap();
 179             let idx = res.get_stream().get_num();
 180             if !self.is_ignored_stream(idx) {
 181                 return Ok(res);
 182             }
 183         }
 184     }
 185     pub fn seek(&mut self, time: u64) -> DemuxerResult<()> {
 186         self.dmx.seek(time)
 187     }
 188 }
 189
 190 impl From<ByteIOError> for DemuxerError {
 191     fn from(_: ByteIOError) -> Self { DemuxerError::IOError }
 192 }
 193
 194 ///The structure used to create demuxers.
 195 pub trait DemuxerCreator {
 196     /// Create new demuxer instance that will use `ByteReader` source as an input.
 197     fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<DemuxCore<'a> + 'a>;
 198     /// Get the name of current demuxer creator.
 199     fn get_name(&self) -> &'static str;
 200 }
 201
 202 macro_rules! validate {
 203     ($a:expr) => { if !$a { return Err(DemuxerError::InvalidData); } };
 204 }
 205
 206 #[cfg(feature="demuxer_gdv")]
 207 mod gdv;
 208 #[cfg(feature="demuxer_avi")]
 209 mod avi;
 210 #[cfg(feature="demuxer_real")]
 211 mod realmedia;
 212
 213
 214 const DEMUXERS: &[&'static DemuxerCreator] = &[
 215 #[cfg(feature="demuxer_avi")]
 216     &avi::AVIDemuxerCreator {},
 217 #[cfg(feature="demuxer_gdv")]
 218     &gdv::GDVDemuxerCreator {},
 219 #[cfg(feature="demuxer_real")]
 220     &realmedia::RealMediaDemuxerCreator {},
 221 //#[cfg(feature="demuxer_real")]
 222 //    &realmedia::RealAudioDemuxerCreator {},
 223 //#[cfg(feature="demuxer_real")]
 224 //    &realmedia::RealIVRDemuxerCreator {},
 225 ];
 226
 227 pub fn find_demuxer(name: &str) -> Option<&DemuxerCreator> {
 228     for &dmx in DEMUXERS {
 229         if dmx.get_name() == name {
 230             return Some(dmx);
 231         }
 232     }
 233     None
 234 }
 235
 236 pub fn create_demuxer<'a>(dmxcr: &DemuxerCreator, br: &'a mut ByteReader<'a>) -> DemuxerResult<Demuxer<'a>> {
 237     let mut dmx = dmxcr.new_demuxer(br);
 238     let mut str = StreamManager::new();
 239     dmx.open(&mut str)?;
 240     Ok(Demuxer::new(dmx, str))
 241 }