+//! Demuxer definitions.
pub use crate::frame::*;
pub use crate::io::byteio::*;
+/// A list specifying general demuxing errors.
#[derive(Debug,Clone,Copy,PartialEq)]
#[allow(dead_code)]
pub enum DemuxerError {
+ /// Reader got to end of stream.
EOF,
+ /// Demuxer encountered empty container.
NoSuchInput,
+ /// Demuxer encountered invalid input data.
InvalidData,
+ /// Data reading error.
IOError,
+ /// Feature is not implemented.
NotImplemented,
+ /// Allocation failed.
MemoryError,
+ /// The operation should be repeated.
TryAgain,
+ /// Seeking failed.
SeekError,
+ /// Operation cannot succeed in principle (e.g. seeking in a format not supporting seeking).
NotPossible,
}
+/// A specialised `Result` type for demuxing operations.
pub type DemuxerResult<T> = Result<T, DemuxerError>;
+/// A trait for demuxing operations.
pub trait DemuxCore<'a> {
+ /// Opens the input stream, reads required headers and prepares everything for packet demuxing.
fn open(&mut self, strmgr: &mut StreamManager, seek_idx: &mut SeekIndex) -> DemuxerResult<()>;
+ /// Demuxes a packet.
fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket>;
+ /// Seeks to the requested time.
fn seek(&mut self, time: u64, seek_idx: &SeekIndex) -> DemuxerResult<()>;
}
+/// An auxiliary trait to make bytestream reader read packet data.
pub trait NAPacketReader {
+ /// Reads input and constructs a packet containing it.
fn read_packet(&mut self, str: NAStreamRef, ts: NATimeInfo, keyframe: bool, size: usize) -> DemuxerResult<NAPacket>;
+ /// Reads input into already existing packet.
fn fill_packet(&mut self, pkt: &mut NAPacket) -> DemuxerResult<()>;
}
}
}
+/// An auxiliary structure for operations with individual streams inside the container.
#[derive(Default)]
pub struct StreamManager {
streams: Vec<NAStreamRef>,
}
impl StreamManager {
+ /// Constructs a new instance of `StreamManager`.
pub fn new() -> Self {
StreamManager {
streams: Vec::new(),
no_ign: true,
}
}
+ /// Returns stream iterator.
pub fn iter(&self) -> StreamIter { StreamIter::new(&self.streams) }
+ /// Adds a new stream.
pub fn add_stream(&mut self, stream: NAStream) -> Option<usize> {
let stream_num = self.streams.len();
let mut str = stream.clone();
self.ignored.push(false);
Some(stream_num)
}
+ /// Returns stream with the requested index.
pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
if idx < self.streams.len() {
Some(self.streams[idx].clone())
None
}
}
+ /// Returns stream with the requested stream ID.
pub fn get_stream_by_id(&self, id: u32) -> Option<NAStreamRef> {
for i in 0..self.streams.len() {
if self.streams[i].get_id() == id {
}
None
}
+ /// Returns the number of known streams.
pub fn get_num_streams(&self) -> usize { self.streams.len() }
+ /// Reports whether the stream is marked as ignored.
pub fn is_ignored(&self, idx: usize) -> bool {
if self.no_ign {
true
false
}
}
+ /// Reports whether the stream with certain ID is marked as ignored.
pub fn is_ignored_id(&self, id: u32) -> bool {
for i in 0..self.streams.len() {
if self.streams[i].get_id() == id {
}
false
}
+ /// Marks requested stream as ignored.
pub fn set_ignored(&mut self, idx: usize) {
if idx < self.ignored.len() {
self.ignored[idx] = true;
self.no_ign = false;
}
}
+ /// Clears the ignored mark for the requested stream.
pub fn set_unignored(&mut self, idx: usize) {
if idx < self.ignored.len() {
self.ignored[idx] = false;
}
}
+/// Stream iterator.
pub struct StreamIter<'a> {
streams: &'a [NAStreamRef],
pos: usize,
}
impl<'a> StreamIter<'a> {
+ /// Constructs a new instance of `StreamIter`.
pub fn new(streams: &'a [NAStreamRef]) -> Self {
StreamIter { streams, pos: 0 }
}
}
}
+/// Seeking modes.
#[derive(Clone,Copy,PartialEq)]
pub enum SeekIndexMode {
+ /// No seeking index present.
None,
+ /// Seeking index is present.
Present,
+ /// Seeking index should be constructed by the demuxer if possible.
Automatic,
}
fn default() -> Self { SeekIndexMode::None }
}
+/// A structure holding seeking information.
#[derive(Clone,Copy,Default)]
pub struct SeekEntry {
- pub time: u64, // in milliseconds
+ /// Time in milliseconds.
+ pub time: u64,
+ /// PTS
pub pts: u64,
+ /// Position in file.
pub pos: u64,
}
+/// Seeking information for individual streams.
#[derive(Clone)]
pub struct StreamSeekInfo {
+ /// Stream ID.
pub id: u32,
+ /// Index is present.
pub filled: bool,
+ /// Packet seeking information.
pub entries: Vec<SeekEntry>,
}
impl StreamSeekInfo {
+ /// Constructs a new `StreamSeekInfo` instance.
pub fn new(id: u32) -> Self {
Self {
id,
entries: Vec::new(),
}
}
+ /// Adds new seeking point.
pub fn add_entry(&mut self, entry: SeekEntry) {
self.entries.push(entry);
}
+ /// Searches for an appropriate seek position before requested time.
pub fn find_pos(&self, time: u64) -> Option<SeekEntry> {
if !self.entries.is_empty() {
// todo something faster like binary search
}
}
+/// Structure for holding seeking point search results.
#[derive(Clone,Copy,Default)]
pub struct SeekIndexResult {
+ /// Packet PTS.
pub pts: u64,
+ /// Position in file.
pub pos: u64,
+ /// Stream ID.
pub str_id: u32,
}
+/// Seek information for the whole container.
#[derive(Default)]
pub struct SeekIndex {
+ /// Seek information for individual streams.
pub seek_info: Vec<StreamSeekInfo>,
+ /// Seeking index mode.
pub mode: SeekIndexMode,
+ /// Ignore index flag.
pub skip_index: bool,
}
impl SeekIndex {
+ /// Constructs a new `SeekIndex` instance.
pub fn new() -> Self { Self::default() }
pub fn add_stream(&mut self, id: u32) -> usize {
let ret = self.stream_id_to_index(id);
ret.unwrap()
}
}
+ /// Adds a new stream to the index.
pub fn stream_id_to_index(&self, id: u32) -> Option<usize> {
for (idx, str) in self.seek_info.iter().enumerate() {
if str.id == id {
}
None
}
+ /// Returns stream reference for provided stream ID.
pub fn get_stream_index(&mut self, id: u32) -> Option<&mut StreamSeekInfo> {
for str in self.seek_info.iter_mut() {
if str.id == id {
}
None
}
+ /// Adds seeking information to the index.
pub fn add_entry(&mut self, id: u32, entry: SeekEntry) {
let mut idx = self.stream_id_to_index(id);
if idx.is_none() {
self.seek_info[idx.unwrap()].add_entry(entry);
self.seek_info[idx.unwrap()].filled = true;
}
+ /// Searches for a seek position before requested time.
pub fn find_pos(&self, time: u64) -> Option<SeekIndexResult> {
let mut cand = None;
for str in self.seek_info.iter() {
}
}
+/// Demuxer structure with auxiliary data.
pub struct Demuxer<'a> {
dmx: Box<dyn DemuxCore<'a> + 'a>,
streams: StreamManager,
}
impl<'a> Demuxer<'a> {
+ /// Constructs a new `Demuxer` instance.
fn new(dmx: Box<dyn DemuxCore<'a> + 'a>, str: StreamManager, seek_idx: SeekIndex) -> Self {
Demuxer {
dmx,
seek_idx,
}
}
+ /// Returns a stream reference by its number.
pub fn get_stream(&self, idx: usize) -> Option<NAStreamRef> {
self.streams.get_stream(idx)
}
+ /// Returns a stream reference by its ID.
pub fn get_stream_by_id(&self, id: u32) -> Option<NAStreamRef> {
self.streams.get_stream_by_id(id)
}
+ /// Reports the total number of streams.
pub fn get_num_streams(&self) -> usize {
self.streams.get_num_streams()
}
+ /// Returns an iterator over streams.
pub fn get_streams(&self) -> StreamIter {
self.streams.iter()
}
+ /// Returns 'ignored' marker for requested stream.
pub fn is_ignored_stream(&self, idx: usize) -> bool {
self.streams.is_ignored(idx)
}
+ /// Sets 'ignored' marker for requested stream.
pub fn set_ignored_stream(&mut self, idx: usize) {
self.streams.set_ignored(idx)
}
+ /// Clears 'ignored' marker for requested stream.
pub fn set_unignored_stream(&mut self, idx: usize) {
self.streams.set_unignored(idx)
}
+ /// Demuxes a new packet from the container.
pub fn get_frame(&mut self) -> DemuxerResult<NAPacket> {
loop {
let res = self.dmx.get_frame(&mut self.streams);
}
}
}
+ /// Seeks to the requested time (in milliseconds) if possible.
pub fn seek(&mut self, time: u64) -> DemuxerResult<()> {
if self.seek_idx.skip_index {
return Err(DemuxerError::NotPossible);
}
self.dmx.seek(time, &self.seek_idx)
}
+ /// Returns internal seek index.
pub fn get_seek_index(&self) -> &SeekIndex {
&self.seek_idx
}
fn from(_: ByteIOError) -> Self { DemuxerError::IOError }
}
-///The structure used to create demuxers.
+/// The trait for creating demuxers.
pub trait DemuxerCreator {
- /// Create new demuxer instance that will use `ByteReader` source as an input.
+ /// Creates new demuxer instance that will use `ByteReader` source as an input.
fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a>;
- /// Get the name of current demuxer creator.
+ /// Returns the name of current demuxer creator (equal to the container name it can demux).
fn get_name(&self) -> &'static str;
}
+/// Creates demuxer for a provided bytestream.
pub fn create_demuxer<'a>(dmxcr: &DemuxerCreator, br: &'a mut ByteReader<'a>) -> DemuxerResult<Demuxer<'a>> {
let mut dmx = dmxcr.new_demuxer(br);
let mut str = StreamManager::new();
Ok(Demuxer::new(dmx, str, seek_idx))
}
+/// List of registered demuxers.
#[derive(Default)]
pub struct RegisteredDemuxers {
dmxs: Vec<&'static DemuxerCreator>,
}
impl RegisteredDemuxers {
+ /// Constructs a new `RegisteredDemuxers` instance.
pub fn new() -> Self {
Self { dmxs: Vec::new() }
}
+ /// Registers a new demuxer.
pub fn add_demuxer(&mut self, dmx: &'static DemuxerCreator) {
self.dmxs.push(dmx);
}
+ /// Searches for a demuxer that supports requested container format.
pub fn find_demuxer(&self, name: &str) -> Option<&DemuxerCreator> {
for &dmx in self.dmxs.iter() {
if dmx.get_name() == name {
projects / nihav.git / commitdiff