93 lines
2.6 KiB
Rust
93 lines
2.6 KiB
Rust
use bytes::BytesMut;
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use bytes::BufMut;
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use futures::Async;
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use futures::stream::Stream;
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use ebml::*;
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use webm::*;
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pub enum ParsingError<E> {
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EbmlError(::ebml::Error),
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OtherError(E)
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}
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pub struct WebmBuffer<S> {
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stream: S,
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buffer: BytesMut,
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last_read: usize
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}
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impl<I: AsRef<[u8]>, S: Stream<Item = I>> WebmBuffer<S> {
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pub fn new(stream: S) -> Self {
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WebmBuffer {
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stream: stream,
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buffer: BytesMut::new(),
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last_read: 0
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}
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}
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pub fn try_decode(&mut self) -> Result<Async<Option<WebmElement>>, ParsingError<S::Error>> {
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match WebmElement::decode_element(&self.buffer) {
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Err(err) => {
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//println!("EBML error: {:?}", err);
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return Err(ParsingError::EbmlError(err))
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},
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Ok(None) => {
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//println!("Need refill");
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// need to refill buffer
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return Ok(Async::NotReady);
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},
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Ok(Some((element, element_size))) => {
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//println!("Parsed element: {:?}", element);
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self.last_read = element_size;
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return Ok(Async::Ready(Some(element)))
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}
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};
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}
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pub fn can_decode(&mut self) -> bool {
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match self.try_decode() {
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Ok(Async::NotReady) => false,
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_ => true
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}
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}
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pub fn poll_event<'a>(&'a mut self) -> Result<Async<Option<WebmElement<'a>>>, ParsingError<S::Error>> {
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// release buffer from previous event
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self.buffer.advance(self.last_read);
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self.last_read = 0;
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loop {
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if self.can_decode() {
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return self.try_decode()
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}
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match self.stream.poll() {
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Ok(Async::NotReady) => return Ok(Async::NotReady),
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Ok(Async::Ready(None)) => return Ok(Async::Ready(None)),
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Ok(Async::Ready(Some(chunk))) => {
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self.buffer.reserve(chunk.as_ref().len());
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self.buffer.put_slice(chunk.as_ref());
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//println!("Read {} into Buffer", chunk.as_ref().len());
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// ok can retry decoding now
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}
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Err(err) => return Err(ParsingError::OtherError(err))
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};
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}
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}
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}
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impl<I: AsRef<[u8]>, S: Stream<Item = I>> WebmEventSource for WebmBuffer<S> {
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type Error = ParsingError<S::Error>;
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fn poll_event<'a>(&'a mut self) -> Result<Async<Option<WebmElement<'a>>>, Self::Error> {
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return WebmBuffer::poll_event(self);
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}
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}
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#[cfg(test)]
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mod tests {
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//#[test]
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}
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