2018-03-15 18:52:38 +00:00
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// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
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2018-07-06 07:19:59 +00:00
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// Copyright (C) 2018 LEE Dongjun <redongjun@gmail.com>
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2018-03-15 18:52:38 +00:00
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
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// Boston, MA 02110-1335, USA.
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2019-11-24 20:12:40 +00:00
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use either::Either;
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use futures::{channel::oneshot, prelude::*};
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2018-03-15 18:52:38 +00:00
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use gst;
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use gst::prelude::*;
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2019-11-24 20:12:40 +00:00
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use gst::{gst_debug, gst_error};
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2018-03-15 18:52:38 +00:00
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2019-11-24 20:12:40 +00:00
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use lazy_static::lazy_static;
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2018-03-15 18:52:38 +00:00
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2019-11-24 20:12:40 +00:00
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use std::io;
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use std::pin::Pin;
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use std::sync::{Arc, Mutex};
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use std::task::{self, Poll};
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2018-03-16 17:11:53 +00:00
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2019-11-24 20:12:40 +00:00
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use tokio_executor::current_thread as tokio_current_thread;
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use super::iocontext::*;
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2018-03-15 18:52:38 +00:00
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2018-03-26 14:49:42 +00:00
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lazy_static! {
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2018-03-15 18:52:38 +00:00
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static ref SOCKET_CAT: gst::DebugCategory = gst::DebugCategory::new(
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2018-03-26 14:49:42 +00:00
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"ts-socket",
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gst::DebugColorFlags::empty(),
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2019-05-23 20:55:54 +00:00
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Some("Thread-sharing Socket"),
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2018-03-26 14:49:42 +00:00
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);
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2018-03-15 18:52:38 +00:00
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}
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2018-07-06 07:19:59 +00:00
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pub struct Socket<T: SocketRead + 'static>(Arc<Mutex<SocketInner<T>>>);
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2018-03-15 18:52:38 +00:00
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#[derive(PartialEq, Eq, Debug)]
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enum SocketState {
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Unscheduled,
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Scheduled,
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Running,
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Shutdown,
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}
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2019-11-24 20:12:40 +00:00
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pub trait SocketRead: Send + Unpin {
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2018-07-06 07:19:59 +00:00
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const DO_TIMESTAMP: bool;
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2019-03-13 16:07:53 +00:00
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fn poll_read(
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self: Pin<&mut Self>,
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cx: &mut task::Context<'_>,
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buf: &mut [u8],
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2019-11-24 20:12:40 +00:00
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) -> Poll<io::Result<(usize, Option<std::net::SocketAddr>)>>;
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2018-07-06 07:19:59 +00:00
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}
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struct SocketInner<T: SocketRead + 'static> {
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2018-03-15 18:52:38 +00:00
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element: gst::Element,
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state: SocketState,
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reader: Pin<Box<T>>,
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2018-03-15 18:52:38 +00:00
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buffer_pool: gst::BufferPool,
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waker: Option<task::Waker>,
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2018-03-15 18:52:38 +00:00
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shutdown_receiver: Option<oneshot::Receiver<()>>,
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clock: Option<gst::Clock>,
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base_time: Option<gst::ClockTime>,
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}
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2018-07-06 07:19:59 +00:00
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impl<T: SocketRead + 'static> Socket<T> {
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pub fn new(element: &gst::Element, reader: T, buffer_pool: gst::BufferPool) -> Self {
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Socket(Arc::new(Mutex::new(SocketInner::<T> {
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2018-03-15 18:52:38 +00:00
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element: element.clone(),
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state: SocketState::Unscheduled,
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2019-11-24 20:12:40 +00:00
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reader: Pin::new(Box::new(reader)),
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2019-02-21 18:12:09 +00:00
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buffer_pool,
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waker: None,
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2018-03-15 18:52:38 +00:00
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shutdown_receiver: None,
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clock: None,
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base_time: None,
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})))
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}
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2019-11-24 20:12:40 +00:00
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pub fn schedule<F, G, Fut>(
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&self,
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io_context: &IOContext,
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func: F,
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err_func: G,
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) -> Result<(), ()>
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2018-03-16 17:11:53 +00:00
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where
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2019-11-24 20:12:40 +00:00
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F: Fn((gst::Buffer, Option<std::net::SocketAddr>)) -> Fut + Send + 'static,
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Fut: Future<Output = Result<(), gst::FlowError>> + Send + 'static,
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2018-03-16 17:11:53 +00:00
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G: FnOnce(Either<gst::FlowError, io::Error>) + Send + 'static,
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{
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2018-03-15 18:52:38 +00:00
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// Ready->Paused
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//
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// Need to wait for a possible shutdown to finish first
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// spawn() on the reactor, change state to Scheduled
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2018-07-06 07:19:59 +00:00
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let stream = SocketStream::<T>(self.clone(), None);
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2018-03-15 18:52:38 +00:00
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let mut inner = self.0.lock().unwrap();
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Scheduling socket");
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if inner.state == SocketState::Scheduled {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket already scheduled");
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2018-03-16 18:24:36 +00:00
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return Ok(());
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2018-03-15 18:52:38 +00:00
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}
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assert_eq!(inner.state, SocketState::Unscheduled);
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inner.state = SocketState::Scheduled;
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2019-09-06 17:19:54 +00:00
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if inner.buffer_pool.set_active(true).is_err() {
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2018-03-16 18:24:36 +00:00
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gst_error!(SOCKET_CAT, obj: &inner.element, "Failed to activate buffer pool");
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return Err(());
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}
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2018-03-15 18:52:38 +00:00
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2019-11-24 20:12:40 +00:00
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let (sender, receiver) = oneshot::channel();
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2018-03-15 18:52:38 +00:00
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inner.shutdown_receiver = Some(receiver);
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let element_clone = inner.element.clone();
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io_context.spawn(
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stream
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.try_for_each(move |(buffer, saddr)| {
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2019-03-13 16:07:53 +00:00
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func((buffer, saddr)).into_future().map_err(Either::Left)
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})
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.then(move |res| {
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gst_debug!(
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SOCKET_CAT,
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obj: &element_clone,
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"Socket finished: {:?}",
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res
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);
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if let Err(err) = res {
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err_func(err);
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}
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2018-03-15 18:52:38 +00:00
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let _ = sender.send(());
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2019-11-24 20:12:40 +00:00
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future::ready(())
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2018-03-15 18:52:38 +00:00
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}),
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);
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2018-03-16 18:24:36 +00:00
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Ok(())
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2018-03-15 18:52:38 +00:00
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}
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2018-07-06 07:19:59 +00:00
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pub fn unpause(&self, clock: Option<gst::Clock>, base_time: Option<gst::ClockTime>) {
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2018-03-15 18:52:38 +00:00
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// Paused->Playing
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//
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// Change state to Running and signal task
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let mut inner = self.0.lock().unwrap();
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Unpausing socket");
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if inner.state == SocketState::Running {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket already unpaused");
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return;
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}
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assert_eq!(inner.state, SocketState::Scheduled);
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inner.state = SocketState::Running;
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2018-07-06 07:19:59 +00:00
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inner.clock = clock;
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inner.base_time = base_time;
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2018-03-15 18:52:38 +00:00
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2019-11-24 20:12:40 +00:00
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if let Some(waker) = inner.waker.take() {
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waker.wake();
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2018-03-15 18:52:38 +00:00
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}
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}
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pub fn pause(&self) {
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// Playing->Paused
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//
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// Change state to Scheduled and signal task
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let mut inner = self.0.lock().unwrap();
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Pausing socket");
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if inner.state == SocketState::Scheduled {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket already paused");
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return;
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}
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assert_eq!(inner.state, SocketState::Running);
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inner.state = SocketState::Scheduled;
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inner.clock = None;
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inner.base_time = None;
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2019-11-24 20:12:40 +00:00
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if let Some(waker) = inner.waker.take() {
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waker.wake();
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2018-03-15 18:52:38 +00:00
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}
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}
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pub fn shutdown(&self) {
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// Paused->Ready
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//
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// Change state to Shutdown and signal task, wait for our future to be finished
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// Requires scheduled function to be unblocked! Pad must be deactivated before
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let mut inner = self.0.lock().unwrap();
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Shutting down socket");
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if inner.state == SocketState::Unscheduled {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket already shut down");
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return;
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}
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assert!(inner.state == SocketState::Scheduled || inner.state == SocketState::Running);
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inner.state = SocketState::Shutdown;
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2019-11-24 20:12:40 +00:00
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if let Some(waker) = inner.waker.take() {
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waker.wake();
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2018-03-15 18:52:38 +00:00
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}
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let shutdown_receiver = inner.shutdown_receiver.take().unwrap();
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Waiting for socket to shut down");
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drop(inner);
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2019-11-24 20:12:40 +00:00
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tokio_current_thread::block_on_all(shutdown_receiver).expect("Already shut down");
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2018-03-15 18:52:38 +00:00
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let mut inner = self.0.lock().unwrap();
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inner.state = SocketState::Unscheduled;
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2018-03-16 18:24:36 +00:00
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let _ = inner.buffer_pool.set_active(false);
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2018-03-15 18:52:38 +00:00
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket shut down");
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}
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}
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2019-11-24 20:12:40 +00:00
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impl<T: SocketRead + Unpin + 'static> Clone for Socket<T> {
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2018-07-06 07:19:59 +00:00
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fn clone(&self) -> Self {
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Socket::<T>(self.0.clone())
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}
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}
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impl<T: SocketRead + 'static> Drop for SocketInner<T> {
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2018-03-15 18:52:38 +00:00
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fn drop(&mut self) {
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assert_eq!(self.state, SocketState::Unscheduled);
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}
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}
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2018-07-06 07:19:59 +00:00
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struct SocketStream<T: SocketRead + 'static>(
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Socket<T>,
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Option<gst::MappedBuffer<gst::buffer::Writable>>,
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);
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2018-03-15 18:52:38 +00:00
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2018-07-06 07:19:59 +00:00
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impl<T: SocketRead + 'static> Stream for SocketStream<T> {
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type Item =
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Result<(gst::Buffer, Option<std::net::SocketAddr>), Either<gst::FlowError, io::Error>>;
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fn poll_next(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Option<Self::Item>> {
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// take the mapped_buffer before locking the socket so as to please the mighty borrow checker
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let mut mapped_buffer = self.1.take();
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2018-03-15 18:52:38 +00:00
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let mut inner = (self.0).0.lock().unwrap();
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if inner.state == SocketState::Shutdown {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket shutting down");
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2019-11-24 20:12:40 +00:00
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return Poll::Ready(None);
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2018-03-15 18:52:38 +00:00
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} else if inner.state == SocketState::Scheduled {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Socket not running");
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2019-11-24 20:12:40 +00:00
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inner.waker = Some(cx.waker().clone());
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drop(inner);
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self.1 = mapped_buffer;
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return Poll::Pending;
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2018-03-15 18:52:38 +00:00
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}
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assert_eq!(inner.state, SocketState::Running);
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Trying to read data");
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2019-03-13 16:07:53 +00:00
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let (len, saddr, time) = {
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2019-11-24 20:12:40 +00:00
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let buffer = match mapped_buffer {
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2018-03-15 18:52:38 +00:00
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Some(ref mut buffer) => buffer,
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None => match inner.buffer_pool.acquire_buffer(None) {
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Ok(buffer) => {
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2019-11-24 20:12:40 +00:00
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mapped_buffer = Some(buffer.into_mapped_buffer_writable().unwrap());
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mapped_buffer.as_mut().unwrap()
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2018-03-15 18:52:38 +00:00
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}
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Err(err) => {
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Failed to acquire buffer {:?}", err);
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2019-11-24 20:12:40 +00:00
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return Poll::Ready(Some(Err(Either::Left(err))));
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2018-03-15 18:52:38 +00:00
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}
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},
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};
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2019-11-24 20:12:40 +00:00
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match inner.reader.as_mut().poll_read(cx, buffer.as_mut_slice()) {
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Poll::Pending => {
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2018-03-15 18:52:38 +00:00
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gst_debug!(SOCKET_CAT, obj: &inner.element, "No data available");
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2019-11-24 20:12:40 +00:00
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inner.waker = Some(cx.waker().clone());
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drop(inner);
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self.1 = mapped_buffer;
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return Poll::Pending;
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2018-03-15 18:52:38 +00:00
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}
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2019-11-24 20:12:40 +00:00
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Poll::Ready(Err(err)) => {
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2018-03-15 18:52:38 +00:00
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gst_debug!(SOCKET_CAT, obj: &inner.element, "Read error {:?}", err);
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2019-11-24 20:12:40 +00:00
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return Poll::Ready(Some(Err(Either::Right(err))));
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2018-03-15 18:52:38 +00:00
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}
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Poll::Ready(Ok((len, saddr))) => {
|
2018-07-06 07:19:59 +00:00
|
|
|
let dts = if T::DO_TIMESTAMP {
|
|
|
|
let time = inner.clock.as_ref().unwrap().get_time();
|
|
|
|
let running_time = time - inner.base_time.unwrap();
|
|
|
|
gst_debug!(SOCKET_CAT, obj: &inner.element, "Read {} bytes at {} (clock {})", len, running_time, time);
|
|
|
|
running_time
|
|
|
|
} else {
|
|
|
|
gst_debug!(SOCKET_CAT, obj: &inner.element, "Read {} bytes", len);
|
|
|
|
gst::CLOCK_TIME_NONE
|
|
|
|
};
|
2019-03-13 16:07:53 +00:00
|
|
|
(len, saddr, dts)
|
2018-03-15 18:52:38 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
2019-11-24 20:12:40 +00:00
|
|
|
let mut buffer = mapped_buffer.unwrap().into_buffer();
|
2018-03-15 18:52:38 +00:00
|
|
|
{
|
|
|
|
let buffer = buffer.get_mut().unwrap();
|
|
|
|
if len < buffer.get_size() {
|
|
|
|
buffer.set_size(len);
|
|
|
|
}
|
|
|
|
buffer.set_dts(time);
|
|
|
|
}
|
|
|
|
|
2019-11-24 20:12:40 +00:00
|
|
|
Poll::Ready(Some(Ok((buffer, saddr))))
|
2018-03-15 18:52:38 +00:00
|
|
|
}
|
|
|
|
}
|