2020-01-03 17:46:32 +00:00
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// Copyright (C) 2019 Mathieu Duponchelle <mathieu@centricular.com>
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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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use either::Either;
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use futures::executor::block_on;
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use futures::future::BoxFuture;
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use futures::future::{abortable, AbortHandle};
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use futures::lock::{Mutex, MutexGuard};
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use futures::prelude::*;
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use glib;
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use glib::prelude::*;
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use glib::subclass;
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use glib::subclass::prelude::*;
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use glib::{glib_object_impl, glib_object_subclass};
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use gst;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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use gst::{gst_debug, gst_error_msg, gst_log, gst_trace};
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use lazy_static::lazy_static;
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use std::collections::HashMap;
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use std::sync::Arc;
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use std::time::Duration;
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use std::u32;
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use crate::runtime::prelude::*;
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2020-02-19 19:42:19 +00:00
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use crate::runtime::{self, Context, PadSink, PadSinkRef, PadSrc};
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2020-01-03 17:46:32 +00:00
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fn get_current_running_time(element: &gst::Element) -> gst::ClockTime {
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if let Some(clock) = element.get_clock() {
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if clock.get_time() > element.get_base_time() {
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clock.get_time() - element.get_base_time()
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} else {
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0.into()
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}
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} else {
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gst::CLOCK_TIME_NONE
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}
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}
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const DEFAULT_CONTEXT: &str = "";
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const DEFAULT_CONTEXT_WAIT: u32 = 0;
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#[derive(Debug, Clone)]
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struct Settings {
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context: String,
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context_wait: u32,
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}
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impl Default for Settings {
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fn default() -> Self {
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Settings {
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context: DEFAULT_CONTEXT.into(),
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context_wait: DEFAULT_CONTEXT_WAIT,
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}
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}
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}
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static PROPERTIES: [subclass::Property; 3] = [
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subclass::Property("context", |name| {
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glib::ParamSpec::string(
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name,
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"Context",
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"Context name to share threads with",
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Some(DEFAULT_CONTEXT),
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("context-wait", |name| {
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glib::ParamSpec::uint(
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name,
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"Context Wait",
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"Throttle poll loop to run at most once every this many ms",
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0,
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1000,
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DEFAULT_CONTEXT_WAIT,
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("active-pad", |name| {
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glib::ParamSpec::object(
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name,
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"Active Pad",
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"Currently active pad",
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gst::Pad::static_type(),
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glib::ParamFlags::READWRITE,
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)
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}),
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];
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#[derive(Debug)]
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struct InputSelectorPadSinkHandlerInner {
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segment: Option<gst::Segment>,
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abort_handle: Option<AbortHandle>,
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}
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impl Default for InputSelectorPadSinkHandlerInner {
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fn default() -> Self {
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InputSelectorPadSinkHandlerInner {
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segment: None,
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abort_handle: None,
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}
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}
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}
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#[derive(Clone, Debug)]
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struct InputSelectorPadSinkHandler(Arc<Mutex<InputSelectorPadSinkHandlerInner>>);
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impl InputSelectorPadSinkHandler {
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fn new() -> Self {
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InputSelectorPadSinkHandler(Arc::new(Mutex::new(
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InputSelectorPadSinkHandlerInner::default(),
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)))
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}
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#[inline]
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async fn lock(&self) -> MutexGuard<'_, InputSelectorPadSinkHandlerInner> {
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self.0.lock().await
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}
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/* Wait until specified time */
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async fn sync(&self, element: &gst::Element, running_time: gst::ClockTime) {
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let now = get_current_running_time(&element);
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if now.is_some() && now < running_time {
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let delay = running_time - now;
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2020-02-19 19:42:19 +00:00
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runtime::time::delay_for(Duration::from_nanos(delay.nseconds().unwrap())).await;
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2020-01-03 17:46:32 +00:00
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}
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}
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async fn handle_item(
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&self,
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pad: PadSinkRef<'_>,
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element: &gst::Element,
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buffer: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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let inputselector = InputSelector::from_instance(element);
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let mut inner = self.lock().await;
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if let Some(segment) = &inner.segment {
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if let Some(segment) = segment.downcast_ref::<gst::format::Time>() {
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let rtime = segment.to_running_time(buffer.get_pts());
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let (sync_fut, abort_handle) = abortable(self.sync(&element, rtime));
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inner.abort_handle = Some(abort_handle);
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drop(inner);
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let _ = sync_fut.await;
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}
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}
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let mut state = inputselector.state.lock().await;
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if state.active_sinkpad.as_ref() == Some(pad.gst_pad()) {
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gst_log!(CAT, obj: pad.gst_pad(), "Forwarding {:?}", buffer);
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if state.send_sticky {
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let mut stickies: Vec<gst::Event> = vec![];
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pad.gst_pad().sticky_events_foreach(|event| {
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let mut forward = true;
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if event.get_type() == gst::EventType::StreamStart {
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forward = state.send_stream_start;
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state.send_stream_start = false;
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}
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if forward {
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stickies.push(event.clone());
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}
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Ok(Some(event))
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});
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for event in &stickies {
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inputselector.src_pad.push_event(event.clone()).await;
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}
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state.send_sticky = false;
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}
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drop(state);
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inputselector.src_pad.push(buffer).await
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} else {
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gst_log!(CAT, obj: pad.gst_pad(), "Dropping {:?}", buffer);
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Ok(gst::FlowSuccess::Ok)
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}
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}
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}
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impl PadSinkHandler for InputSelectorPadSinkHandler {
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type ElementImpl = InputSelector;
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fn sink_chain(
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&self,
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2020-02-19 19:42:19 +00:00
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pad: &PadSinkRef,
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2020-01-03 17:46:32 +00:00
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_inputselector: &InputSelector,
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element: &gst::Element,
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buffer: gst::Buffer,
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) -> BoxFuture<'static, Result<gst::FlowSuccess, gst::FlowError>> {
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let this = self.clone();
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let element = element.clone();
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let pad_weak = pad.downgrade();
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async move {
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let pad = pad_weak.upgrade().expect("PadSink no longer exists");
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this.handle_item(pad, &element, buffer).await
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}
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.boxed()
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}
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fn sink_chain_list(
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&self,
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2020-02-19 19:42:19 +00:00
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pad: &PadSinkRef,
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2020-01-03 17:46:32 +00:00
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_inputselector: &InputSelector,
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element: &gst::Element,
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list: gst::BufferList,
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) -> BoxFuture<'static, Result<gst::FlowSuccess, gst::FlowError>> {
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let element = element.clone();
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let pad_weak = pad.downgrade();
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async move {
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let inputselector = InputSelector::from_instance(&element);
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let pad = pad_weak.upgrade().expect("PadSink no longer exists");
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gst_log!(CAT, obj: pad.gst_pad(), "Handling buffer list {:?}", list);
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inputselector.src_pad.push_list(list).await
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}
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.boxed()
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}
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fn sink_event(
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&self,
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2020-02-19 19:42:19 +00:00
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_pad: &PadSinkRef,
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2020-01-03 17:46:32 +00:00
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inputselector: &InputSelector,
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_element: &gst::Element,
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event: gst::Event,
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) -> Either<bool, BoxFuture<'static, bool>> {
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if event.is_serialized() {
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let this = self.clone();
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Either::Right(
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async move {
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match event.view() {
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gst::EventView::Segment(e) => {
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let mut inner = this.lock().await;
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inner.segment = Some(e.get_segment().clone());
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}
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_ => (),
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}
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true
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}
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.boxed(),
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)
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} else {
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/* Drop all events for now */
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match event.view() {
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gst::EventView::FlushStart(..) => {
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/* Unblock downstream */
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inputselector.src_pad.gst_pad().push_event(event.clone());
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let mut inner = block_on(self.lock());
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if let Some(abort_handle) = inner.abort_handle.take() {
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abort_handle.abort();
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}
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}
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_ => (),
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}
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Either::Left(true)
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}
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}
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fn sink_query(
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&self,
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2020-02-19 19:42:19 +00:00
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pad: &PadSinkRef,
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2020-01-03 17:46:32 +00:00
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inputselector: &InputSelector,
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_element: &gst::Element,
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query: &mut gst::QueryRef,
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) -> bool {
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gst_log!(CAT, obj: pad.gst_pad(), "Handling query {:?}", query);
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if query.is_serialized() {
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// FIXME: How can we do this (drops ALLOCATION and DRAIN)?
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gst_log!(CAT, obj: pad.gst_pad(), "Dropping serialized query {:?}", query);
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false
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} else {
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gst_log!(CAT, obj: pad.gst_pad(), "Forwarding query {:?}", query);
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inputselector.src_pad.gst_pad().peer_query(query)
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}
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}
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}
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#[derive(Clone, Debug)]
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struct InputSelectorPadSrcHandler;
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impl InputSelectorPadSrcHandler {}
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impl PadSrcHandler for InputSelectorPadSrcHandler {
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type ElementImpl = InputSelector;
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}
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#[derive(Debug)]
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struct State {
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active_sinkpad: Option<gst::Pad>,
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send_sticky: bool,
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send_stream_start: bool,
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}
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impl Default for State {
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fn default() -> State {
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State {
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active_sinkpad: None,
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send_sticky: false,
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send_stream_start: true,
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2020-01-29 19:18:15 +00:00
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}
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}
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}
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#[derive(Debug)]
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struct Pads {
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pad_serial: u32,
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sink_pads: HashMap<gst::Pad, PadSink>,
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}
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impl Default for Pads {
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fn default() -> Pads {
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Pads {
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2020-01-03 17:46:32 +00:00
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pad_serial: 0,
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sink_pads: HashMap::new(),
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}
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}
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}
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#[derive(Debug)]
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struct InputSelector {
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src_pad: PadSrc,
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state: Mutex<State>,
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settings: Mutex<Settings>,
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2020-01-29 19:18:15 +00:00
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pads: Mutex<Pads>,
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2020-01-03 17:46:32 +00:00
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}
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lazy_static! {
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static ref CAT: gst::DebugCategory = gst::DebugCategory::new(
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"ts-input-selector",
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gst::DebugColorFlags::empty(),
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Some("Thread-sharing input selector"),
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);
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}
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impl InputSelector {
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async fn prepare(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
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gst_debug!(CAT, obj: element, "Preparing");
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let settings = self.settings.lock().await;
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let context =
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Context::acquire(&settings.context, settings.context_wait).map_err(|err| {
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gst_error_msg!(
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gst::ResourceError::OpenRead,
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["Failed to acquire Context: {}", err]
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)
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})?;
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self.src_pad
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.prepare(context, &InputSelectorPadSrcHandler {})
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.await
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.map_err(|err| {
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gst_error_msg!(
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|
gst::ResourceError::OpenRead,
|
|
|
|
["Error joining Context: {:?}", err]
|
|
|
|
)
|
|
|
|
})?;
|
|
|
|
|
|
|
|
gst_debug!(CAT, obj: element, "Prepared");
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
async fn unprepare(&self, element: &gst::Element) -> Result<(), ()> {
|
|
|
|
let mut state = self.state.lock().await;
|
|
|
|
gst_debug!(CAT, obj: element, "Unpreparing");
|
|
|
|
|
|
|
|
let _ = self.src_pad.unprepare().await;
|
|
|
|
|
|
|
|
*state = State::default();
|
|
|
|
|
|
|
|
gst_debug!(CAT, obj: element, "Unprepared");
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
async fn start(&self, element: &gst::Element) -> Result<(), ()> {
|
|
|
|
gst_debug!(CAT, obj: element, "Starting");
|
|
|
|
|
|
|
|
gst_debug!(CAT, obj: element, "Started");
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
|
|
|
async fn stop(&self, element: &gst::Element) -> Result<(), ()> {
|
|
|
|
gst_debug!(CAT, obj: element, "Stopped");
|
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectSubclass for InputSelector {
|
|
|
|
const NAME: &'static str = "RsTsInputSelector";
|
|
|
|
type ParentType = gst::Element;
|
|
|
|
type Instance = gst::subclass::ElementInstanceStruct<Self>;
|
|
|
|
type Class = subclass::simple::ClassStruct<Self>;
|
|
|
|
|
|
|
|
glib_object_subclass!();
|
|
|
|
|
|
|
|
fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
|
|
|
|
klass.set_metadata(
|
|
|
|
"Thread-sharing input selector",
|
|
|
|
"Generic",
|
|
|
|
"Simple input selector element",
|
|
|
|
"Mathieu Duponchelle <mathieu@centricular.com>",
|
|
|
|
);
|
|
|
|
|
|
|
|
let caps = gst::Caps::new_any();
|
|
|
|
|
|
|
|
let sink_pad_template = gst::PadTemplate::new(
|
|
|
|
"sink_%u",
|
|
|
|
gst::PadDirection::Sink,
|
|
|
|
gst::PadPresence::Request,
|
|
|
|
&caps,
|
|
|
|
)
|
|
|
|
.unwrap();
|
|
|
|
klass.add_pad_template(sink_pad_template);
|
|
|
|
|
|
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
|
|
"src",
|
|
|
|
gst::PadDirection::Src,
|
|
|
|
gst::PadPresence::Always,
|
|
|
|
&caps,
|
|
|
|
)
|
|
|
|
.unwrap();
|
|
|
|
klass.add_pad_template(src_pad_template);
|
|
|
|
|
|
|
|
klass.install_properties(&PROPERTIES);
|
|
|
|
}
|
|
|
|
|
|
|
|
fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
|
|
|
|
let templ = klass.get_pad_template("src").unwrap();
|
|
|
|
let src_pad = PadSrc::new_from_template(&templ, Some("src"));
|
|
|
|
|
|
|
|
Self {
|
|
|
|
src_pad,
|
|
|
|
state: Mutex::new(State::default()),
|
|
|
|
settings: Mutex::new(Settings::default()),
|
2020-01-29 19:18:15 +00:00
|
|
|
pads: Mutex::new(Pads::default()),
|
2020-01-03 17:46:32 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectImpl for InputSelector {
|
|
|
|
glib_object_impl!();
|
|
|
|
|
|
|
|
fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
|
|
|
|
let prop = &PROPERTIES[id];
|
|
|
|
|
|
|
|
match *prop {
|
|
|
|
subclass::Property("context", ..) => {
|
|
|
|
let mut settings = block_on(self.settings.lock());
|
|
|
|
settings.context = value
|
|
|
|
.get()
|
|
|
|
.expect("type checked upstream")
|
|
|
|
.unwrap_or_else(|| "".into());
|
|
|
|
}
|
|
|
|
subclass::Property("context-wait", ..) => {
|
|
|
|
let mut settings = block_on(self.settings.lock());
|
|
|
|
settings.context_wait = value.get_some().expect("type checked upstream");
|
|
|
|
}
|
|
|
|
subclass::Property("active-pad", ..) => {
|
|
|
|
let mut state = block_on(self.state.lock());
|
|
|
|
state.active_sinkpad = value.get::<gst::Pad>().expect("type checked upstream");
|
|
|
|
state.send_sticky = true;
|
|
|
|
}
|
|
|
|
_ => unimplemented!(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
|
|
|
|
let prop = &PROPERTIES[id];
|
|
|
|
|
|
|
|
match *prop {
|
|
|
|
subclass::Property("context", ..) => {
|
|
|
|
let settings = block_on(self.settings.lock());
|
|
|
|
Ok(settings.context.to_value())
|
|
|
|
}
|
|
|
|
subclass::Property("context-wait", ..) => {
|
|
|
|
let settings = block_on(self.settings.lock());
|
|
|
|
Ok(settings.context_wait.to_value())
|
|
|
|
}
|
|
|
|
subclass::Property("active-pad", ..) => {
|
|
|
|
let state = block_on(self.state.lock());
|
|
|
|
let active_pad = state.active_sinkpad.clone();
|
|
|
|
Ok(active_pad.to_value())
|
|
|
|
}
|
|
|
|
_ => unimplemented!(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn constructed(&self, obj: &glib::Object) {
|
|
|
|
self.parent_constructed(obj);
|
|
|
|
|
|
|
|
let element = obj.downcast_ref::<gst::Element>().unwrap();
|
|
|
|
element.add_pad(self.src_pad.gst_pad()).unwrap();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ElementImpl for InputSelector {
|
|
|
|
fn change_state(
|
|
|
|
&self,
|
|
|
|
element: &gst::Element,
|
|
|
|
transition: gst::StateChange,
|
|
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
|
|
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
|
|
|
|
|
|
|
|
match transition {
|
|
|
|
gst::StateChange::NullToReady => {
|
|
|
|
block_on(self.prepare(element)).map_err(|err| {
|
|
|
|
element.post_error_message(&err);
|
|
|
|
gst::StateChangeError
|
|
|
|
})?;
|
|
|
|
}
|
|
|
|
gst::StateChange::PausedToReady => {
|
|
|
|
block_on(self.stop(element)).map_err(|_| gst::StateChangeError)?;
|
|
|
|
}
|
|
|
|
gst::StateChange::ReadyToNull => {
|
|
|
|
block_on(self.unprepare(element)).map_err(|_| gst::StateChangeError)?;
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
|
|
|
let success = self.parent_change_state(element, transition)?;
|
|
|
|
|
|
|
|
if transition == gst::StateChange::ReadyToPaused {
|
|
|
|
block_on(self.start(element)).map_err(|_| gst::StateChangeError)?;
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(success)
|
|
|
|
}
|
|
|
|
|
|
|
|
fn request_new_pad(
|
|
|
|
&self,
|
|
|
|
element: &gst::Element,
|
|
|
|
templ: &gst::PadTemplate,
|
|
|
|
_name: Option<String>,
|
|
|
|
_caps: Option<&gst::Caps>,
|
|
|
|
) -> Option<gst::Pad> {
|
|
|
|
let mut state = block_on(self.state.lock());
|
2020-01-29 19:18:15 +00:00
|
|
|
let mut pads = block_on(self.pads.lock());
|
|
|
|
let sink_pad =
|
|
|
|
gst::Pad::new_from_template(&templ, Some(format!("sink_{}", pads.pad_serial).as_str()));
|
|
|
|
pads.pad_serial += 1;
|
2020-01-03 17:46:32 +00:00
|
|
|
sink_pad.set_active(true).unwrap();
|
|
|
|
element.add_pad(&sink_pad).unwrap();
|
|
|
|
let sink_pad = PadSink::new(sink_pad);
|
|
|
|
let ret = sink_pad.gst_pad().clone();
|
|
|
|
|
|
|
|
block_on(sink_pad.prepare(&InputSelectorPadSinkHandler::new()));
|
2020-01-29 19:18:15 +00:00
|
|
|
pads.sink_pads.insert(ret.clone(), sink_pad);
|
2020-01-03 17:46:32 +00:00
|
|
|
|
|
|
|
if state.active_sinkpad.is_none() {
|
|
|
|
state.active_sinkpad = Some(ret.clone());
|
|
|
|
state.send_sticky = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
Some(ret)
|
|
|
|
}
|
|
|
|
|
|
|
|
fn release_pad(&self, element: &gst::Element, pad: &gst::Pad) {
|
2020-01-29 19:18:15 +00:00
|
|
|
let mut pads = block_on(self.pads.lock());
|
|
|
|
let sink_pad = pads.sink_pads.remove(pad).unwrap();
|
2020-01-03 17:46:32 +00:00
|
|
|
block_on(sink_pad.unprepare());
|
|
|
|
element.remove_pad(pad).unwrap();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
|
|
|
|
gst::Element::register(
|
|
|
|
Some(plugin),
|
|
|
|
"ts-input-selector",
|
|
|
|
gst::Rank::None,
|
|
|
|
InputSelector::get_type(),
|
|
|
|
)
|
|
|
|
}
|