src/demuxers/mod.rs

   1 #[cfg(feature="demuxer_gdv")]
   2 pub mod gdv;
   3 #[cfg(feature="demuxer_avi")]
   4 pub mod avi;
   5
   6 use std::fmt;
   7 use std::rc::Rc;
   8 use frame::*;
   9 use std::collections::HashMap;
  10 use io::byteio::*;
  11
  12 /// Possible stream types.
  13 #[derive(Debug,Clone,Copy)]
  14 #[allow(dead_code)]
  15 pub enum StreamType {
  16     /// video stream
  17     Video,
  18     /// audio stream
  19     Audio,
  20     /// subtitles
  21     Subtitles,
  22     /// any data stream (or might be an unrecognized audio/video stream)
  23     Data,
  24     /// nonexistent stream
  25     None,
  26 }
  27
  28 impl fmt::Display for StreamType {
  29     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  30         match *self {
  31             StreamType::Video => write!(f, "Video"),
  32             StreamType::Audio => write!(f, "Audio"),
  33             StreamType::Subtitles => write!(f, "Subtitles"),
  34             StreamType::Data => write!(f, "Data"),
  35             StreamType::None => write!(f, "-"),
  36         }
  37     }
  38 }
  39
  40
  41 #[allow(dead_code)]
  42 #[derive(Clone)]
  43 pub struct NAStream {
  44     media_type:     StreamType,
  45     id:             u32,
  46     num:            usize,
  47     info:           Rc<NACodecInfo>,
  48 }
  49
  50 impl NAStream {
  51     pub fn new(mt: StreamType, id: u32, info: NACodecInfo) -> Self {
  52         NAStream { media_type: mt, id: id, num: 0, info: Rc::new(info) }
  53     }
  54     pub fn get_id(&self) -> u32 { self.id }
  55     pub fn get_num(&self) -> usize { self.num }
  56     pub fn set_num(&mut self, num: usize) { self.num = num; }
  57     pub fn get_info(&self) -> Rc<NACodecInfo> { self.info.clone() }
  58 }
  59
  60 impl fmt::Display for NAStream {
  61     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  62         write!(f, "({}#{} - {})", self.media_type, self.id, self.info.get_properties())
  63     }
  64 }
  65
  66 #[allow(dead_code)]
  67 pub struct NAPacket {
  68     stream:         Rc<NAStream>,
  69     pts:            Option<u64>,
  70     dts:            Option<u64>,
  71     duration:       Option<u64>,
  72     buffer:         Rc<Vec<u8>>,
  73     keyframe:       bool,
  74 //    options:        HashMap<String, NAValue<'a>>,
  75 }
  76
  77 impl NAPacket {
  78     pub fn new(str: Rc<NAStream>, pts: Option<u64>, dts: Option<u64>, dur: Option<u64>, kf: bool, vec: Vec<u8>) -> Self {
  79 //        let mut vec: Vec<u8> = Vec::new();
  80 //        vec.resize(size, 0);
  81         NAPacket { stream: str, pts: pts, dts: dts, duration: dur, keyframe: kf, buffer: Rc::new(vec) }
  82     }
  83     pub fn get_stream(&self) -> Rc<NAStream> { self.stream.clone() }
  84     pub fn get_pts(&self) -> Option<u64> { self.pts }
  85     pub fn get_dts(&self) -> Option<u64> { self.dts }
  86     pub fn get_duration(&self) -> Option<u64> { self.duration }
  87     pub fn is_keyframe(&self) -> bool { self.keyframe }
  88     pub fn get_buffer(&self) -> Rc<Vec<u8>> { self.buffer.clone() }
  89 }
  90
  91 impl Drop for NAPacket {
  92     fn drop(&mut self) {}
  93 }
  94
  95 impl fmt::Display for NAPacket {
  96     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  97         let mut foo = format!("[pkt for {} size {}", self.stream, self.buffer.len());
  98         if let Some(pts) = self.pts { foo = format!("{} pts {}", foo, pts); }
  99         if let Some(dts) = self.dts { foo = format!("{} dts {}", foo, dts); }
 100         if let Some(dur) = self.duration { foo = format!("{} duration {}", foo, dur); }
 101         if self.keyframe { foo = format!("{} kf", foo); }
 102         foo = foo + "]";
 103         write!(f, "{}", foo)
 104     }
 105 }
 106
 107 #[derive(Debug)]
 108 #[allow(dead_code)]
 109 pub enum DemuxerError {
 110     EOF,
 111     NoSuchInput,
 112     InvalidData,
 113     IOError,
 114     NotImplemented,
 115     MemoryError,
 116 }
 117
 118 type DemuxerResult<T> = Result<T, DemuxerError>;
 119
 120 pub trait Demux<'a> {
 121     fn open(&mut self) -> DemuxerResult<()>;
 122     fn get_num_streams(&self) -> usize;
 123     fn get_stream(&self, idx: usize) -> Option<Rc<NAStream>>;
 124     fn get_frame(&mut self) -> DemuxerResult<NAPacket>;
 125     fn seek(&mut self, time: u64) -> DemuxerResult<()>;
 126 }
 127
 128 pub trait NAPacketReader {
 129     fn read_packet(&mut self, str: Rc<NAStream>, pts: Option<u64>, dts: Option<u64>, dur: Option<u64>, keyframe: bool, size: usize) -> DemuxerResult<NAPacket>;
 130     fn fill_packet(&mut self, pkt: &mut NAPacket) -> DemuxerResult<()>;
 131 }
 132
 133 impl<'a> NAPacketReader for ByteReader<'a> {
 134     fn read_packet(&mut self, str: Rc<NAStream>, pts: Option<u64>, dts: Option<u64>, dur: Option<u64>, kf: bool, size: usize) -> DemuxerResult<NAPacket> {
 135         let mut buf: Vec<u8> = Vec::with_capacity(size);
 136         if buf.capacity() < size { return Err(DemuxerError::MemoryError); }
 137         buf.resize(size, 0);
 138         let res = self.read_buf(buf.as_mut_slice());
 139         if let Err(_) = res { return Err(DemuxerError::IOError); }
 140         let pkt = NAPacket::new(str, pts, dts, dur, kf, buf);
 141         Ok(pkt)
 142     }
 143     fn fill_packet(&mut self, pkt: &mut NAPacket) -> DemuxerResult<()> {
 144         let mut refbuf = pkt.get_buffer();
 145         let mut buf = Rc::make_mut(&mut refbuf);
 146         let res = self.read_buf(buf.as_mut_slice());
 147         if let Err(_) = res { return Err(DemuxerError::IOError); }
 148         Ok(())
 149     }
 150 }
 151
 152 pub struct Demuxer {
 153     streams: Vec<Rc<NAStream>>,
 154 }
 155
 156 impl Demuxer {
 157     pub fn new() -> Self { Demuxer { streams: Vec::new() } }
 158     pub fn add_stream(&mut self, stream: NAStream) -> Option<usize> {
 159         let stream_num = self.streams.len();
 160         let mut str = stream.clone();
 161         str.set_num(stream_num);
 162         self.streams.push(Rc::new(str));
 163         Some(stream_num)
 164     }
 165     pub fn get_stream(&self, idx: usize) -> Option<Rc<NAStream>> {
 166         if idx < self.streams.len() {
 167             Some(self.streams[idx].clone())
 168         } else {
 169             None
 170         }
 171     }
 172     pub fn get_stream_by_id(&self, id: u32) -> Option<Rc<NAStream>> {
 173         for i in 0..self.streams.len() {
 174             if self.streams[i].get_id() == id {
 175                 return Some(self.streams[i].clone());
 176             }
 177         }
 178         None
 179     }
 180     pub fn get_num_streams(&self) -> usize { self.streams.len() }
 181 }
 182
 183 impl From<ByteIOError> for DemuxerError {
 184     fn from(_: ByteIOError) -> Self { DemuxerError::IOError }
 185 }
 186
 187 pub trait FrameFromPacket {
 188     fn new_from_pkt(pkt: &NAPacket, info: Rc<NACodecInfo>) -> NAFrame;
 189     fn fill_timestamps(&mut self, pkt: &NAPacket);
 190 }
 191
 192 impl FrameFromPacket for NAFrame {
 193     fn new_from_pkt(pkt: &NAPacket, info: Rc<NACodecInfo>) -> NAFrame {
 194         NAFrame::new(pkt.pts, pkt.dts, pkt.duration, info, HashMap::new())
 195     }
 196     fn fill_timestamps(&mut self, pkt: &NAPacket) {
 197         self.set_pts(pkt.pts);
 198         self.set_dts(pkt.dts);
 199         self.set_duration(pkt.duration);
 200     }
 201 }
 202
 203 ///The structure used to create demuxers.
 204 pub trait DemuxerCreator {
 205     /// Create new demuxer instance that will use `ByteReader` source as an input.
 206     fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<Demux<'a> + 'a>;
 207     /// Get the name of current demuxer creator.
 208     fn get_name(&self) -> &'static str;
 209 }
 210
 211 const DEMUXERS: &[&'static DemuxerCreator] = &[
 212 #[cfg(feature="demuxer_avi")]
 213     &avi::AVIDemuxerCreator {},
 214 #[cfg(feature="demuxer_gdv")]
 215     &gdv::GDVDemuxerCreator {},
 216 ];
 217
 218 pub fn find_demuxer(name: &str) -> Option<&DemuxerCreator> {
 219     for &dmx in DEMUXERS {
 220         if dmx.get_name() == name {
 221             return Some(dmx);
 222         }
 223     }
 224     None
 225 }