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// Copyright (C) 2020 Mathieu Duponchelle <mathieu@centricular.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
// Boston, MA 02110-1335, USA.
//
// SPDX-License-Identifier: LGPL-2.1-or-later
use futures::future::BoxFuture;
use futures::future::{abortable, AbortHandle};
use futures::prelude::*;
use gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
use gst::{gst_debug, gst_log, gst_trace};
use once_cell::sync::Lazy;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use std::time::Duration;
use std::u32;
use crate::runtime::prelude::*;
use crate::runtime::{self, PadSink, PadSinkRef, PadSrc, PadSrcRef};
const DEFAULT_CONTEXT: &str = "";
const DEFAULT_CONTEXT_WAIT: Duration = Duration::ZERO;
#[derive(Debug, Clone)]
struct Settings {
context: String,
context_wait: Duration,
}
impl Default for Settings {
fn default() -> Self {
Settings {
context: DEFAULT_CONTEXT.into(),
context_wait: DEFAULT_CONTEXT_WAIT,
}
}
}
#[derive(Debug)]
struct InputSelectorPadSinkHandlerInner {
segment: Option<gst::Segment>,
send_sticky: bool,
abort_handle: Option<AbortHandle>,
}
impl Default for InputSelectorPadSinkHandlerInner {
fn default() -> Self {
InputSelectorPadSinkHandlerInner {
segment: None,
send_sticky: true,
abort_handle: None,
}
}
}
#[derive(Clone, Debug, Default)]
struct InputSelectorPadSinkHandler(Arc<Mutex<InputSelectorPadSinkHandlerInner>>);
impl InputSelectorPadSinkHandler {
/* Wait until specified time */
async fn sync(
&self,
element: &super::InputSelector,
running_time: impl Into<Option<gst::ClockTime>>,
) {
let now = element.current_running_time();
match running_time.into().opt_checked_sub(now) {
Ok(Some(delay)) => runtime::time::delay_for(delay.into()).await,
_ => runtime::executor::yield_now().await,
}
}
async fn handle_item(
&self,
pad: &PadSinkRef<'_>,
element: &super::InputSelector,
mut buffer: gst::Buffer,
) -> Result<gst::FlowSuccess, gst::FlowError> {
let inputselector = element.imp();
let (stickies, is_active, sync_future, switched_pad) = {
let mut state = inputselector.state.lock().unwrap();
let mut inner = self.0.lock().unwrap();
let mut stickies = vec![];
let mut sync_future = None;
let switched_pad = state.switched_pad;
if let Some(segment) = &inner.segment {
if let Some(segment) = segment.downcast_ref::<gst::format::Time>() {
let rtime = segment.to_running_time(buffer.pts());
let (sync_fut, abort_handle) = abortable(self.sync(element, rtime));
inner.abort_handle = Some(abort_handle);
sync_future = Some(sync_fut.map_err(|_| gst::FlowError::Flushing));
}
}
let is_active = {
if state.active_sinkpad.as_ref() == Some(pad.gst_pad()) {
if inner.send_sticky || state.switched_pad {
pad.gst_pad().sticky_events_foreach(|event| {
use std::ops::ControlFlow;
stickies.push(event.clone());
ControlFlow::Continue(gst::EventForeachAction::Keep)
});
inner.send_sticky = false;
state.switched_pad = false;
}
true
} else {
false
}
};
(stickies, is_active, sync_future, switched_pad)
};
if let Some(sync_fut) = sync_future {
sync_fut.await?;
}
for event in stickies {
inputselector.src_pad.push_event(event).await;
}
if is_active {
gst_log!(CAT, obj: pad.gst_pad(), "Forwarding {:?}", buffer);
if switched_pad && !buffer.flags().contains(gst::BufferFlags::DISCONT) {
let buffer = buffer.make_mut();
buffer.set_flags(gst::BufferFlags::DISCONT);
}
inputselector.src_pad.push(buffer).await
} else {
Ok(gst::FlowSuccess::Ok)
}
}
}
impl PadSinkHandler for InputSelectorPadSinkHandler {
type ElementImpl = InputSelector;
fn sink_chain(
&self,
pad: &PadSinkRef,
_inputselector: &InputSelector,
element: &gst::Element,
buffer: gst::Buffer,
) -> BoxFuture<'static, Result<gst::FlowSuccess, gst::FlowError>> {
let this = self.clone();
let element = element.clone().downcast::<super::InputSelector>().unwrap();
let pad_weak = pad.downgrade();
async move {
let pad = pad_weak.upgrade().expect("PadSink no longer exists");
this.handle_item(&pad, &element, buffer).await
}
.boxed()
}
fn sink_chain_list(
&self,
pad: &PadSinkRef,
_inputselector: &InputSelector,
element: &gst::Element,
list: gst::BufferList,
) -> BoxFuture<'static, Result<gst::FlowSuccess, gst::FlowError>> {
let this = self.clone();
let element = element.clone().downcast::<super::InputSelector>().unwrap();
let pad_weak = pad.downgrade();
async move {
let pad = pad_weak.upgrade().expect("PadSink no longer exists");
gst_log!(CAT, obj: pad.gst_pad(), "Handling buffer list {:?}", list);
// TODO: Ideally we would keep the list intact and forward it in one go
for buffer in list.iter_owned() {
this.handle_item(&pad, &element, buffer).await?;
}
Ok(gst::FlowSuccess::Ok)
}
.boxed()
}
fn sink_event_serialized(
&self,
_pad: &PadSinkRef,
_inputselector: &InputSelector,
_element: &gst::Element,
event: gst::Event,
) -> BoxFuture<'static, bool> {
let this = self.clone();
async move {
let mut inner = this.0.lock().unwrap();
// Remember the segment for later use
if let gst::EventView::Segment(e) = event.view() {
inner.segment = Some(e.segment().clone());
}
// We sent sticky events together with the next buffer once it becomes
// the active pad.
//
// TODO: Other serialized events for the active pad can also be forwarded
// here, and sticky events could be forwarded directly. Needs forwarding of
// all other sticky events first!
if event.is_sticky() {
inner.send_sticky = true;
true
} else {
true
}
}
.boxed()
}
fn sink_event(
&self,
_pad: &PadSinkRef,
inputselector: &InputSelector,
_element: &gst::Element,
event: gst::Event,
) -> bool {
/* Drop all events for now */
if let gst::EventView::FlushStart(..) = event.view() {
/* Unblock downstream */
inputselector.src_pad.gst_pad().push_event(event.clone());
let mut inner = self.0.lock().unwrap();
if let Some(abort_handle) = inner.abort_handle.take() {
abort_handle.abort();
}
}
true
}
fn sink_query(
&self,
pad: &PadSinkRef,
inputselector: &InputSelector,
_element: &gst::Element,
query: &mut gst::QueryRef,
) -> bool {
gst_log!(CAT, obj: pad.gst_pad(), "Handling query {:?}", query);
if query.is_serialized() {
// FIXME: How can we do this (drops ALLOCATION and DRAIN)?
gst_log!(CAT, obj: pad.gst_pad(), "Dropping serialized query {:?}", query);
false
} else {
gst_log!(CAT, obj: pad.gst_pad(), "Forwarding query {:?}", query);
inputselector.src_pad.gst_pad().peer_query(query)
}
}
}
#[derive(Clone, Debug)]
struct InputSelectorPadSrcHandler;
impl PadSrcHandler for InputSelectorPadSrcHandler {
type ElementImpl = InputSelector;
fn src_query(
&self,
pad: &PadSrcRef,
inputselector: &InputSelector,
_element: &gst::Element,
query: &mut gst::QueryRef,
) -> bool {
use gst::QueryView;
gst_log!(CAT, obj: pad.gst_pad(), "Handling {:?}", query);
match query.view_mut() {
QueryView::Latency(ref mut q) => {
let mut ret = true;
let mut min_latency = gst::ClockTime::ZERO;
let mut max_latency = gst::ClockTime::NONE;
let pads = {
let pads = inputselector.pads.lock().unwrap();
pads.sink_pads
.iter()
.map(|p| p.0.clone())
.collect::<Vec<_>>()
};
for pad in pads {
let mut peer_query = gst::query::Latency::new();
ret = pad.peer_query(&mut peer_query);
if ret {
let (live, min, max) = peer_query.result();
if live {
min_latency = min.max(min_latency);
max_latency = max.opt_min(max_latency).or(max);
}
}
}
q.set(true, min_latency, max_latency);
ret
}
_ => {
let sinkpad = {
let state = inputselector.state.lock().unwrap();
state.active_sinkpad.clone()
};
if let Some(sinkpad) = sinkpad {
sinkpad.peer_query(query)
} else {
true
}
}
}
}
}
#[derive(Debug)]
struct State {
active_sinkpad: Option<gst::Pad>,
switched_pad: bool,
}
impl Default for State {
fn default() -> State {
State {
active_sinkpad: None,
switched_pad: true,
}
}
}
#[derive(Debug, Default)]
struct Pads {
pad_serial: u32,
sink_pads: HashMap<gst::Pad, PadSink>,
}
#[derive(Debug)]
pub struct InputSelector {
src_pad: PadSrc,
state: Mutex<State>,
settings: Mutex<Settings>,
pads: Mutex<Pads>,
}
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"ts-input-selector",
gst::DebugColorFlags::empty(),
Some("Thread-sharing input selector"),
)
});
impl InputSelector {
fn unprepare(&self, element: &super::InputSelector) {
let mut state = self.state.lock().unwrap();
gst_debug!(CAT, obj: element, "Unpreparing");
*state = State::default();
gst_debug!(CAT, obj: element, "Unprepared");
}
}
#[glib::object_subclass]
impl ObjectSubclass for InputSelector {
const NAME: &'static str = "RsTsInputSelector";
type Type = super::InputSelector;
type ParentType = gst::Element;
fn with_class(klass: &Self::Class) -> Self {
Self {
src_pad: PadSrc::new(
gst::Pad::from_template(&klass.pad_template("src").unwrap(), Some("src")),
InputSelectorPadSrcHandler,
),
state: Mutex::new(State::default()),
settings: Mutex::new(Settings::default()),
pads: Mutex::new(Pads::default()),
}
}
}
impl ObjectImpl for InputSelector {
fn properties() -> &'static [glib::ParamSpec] {
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
vec![
glib::ParamSpecString::new(
"context",
"Context",
"Context name to share threads with",
Some(DEFAULT_CONTEXT),
glib::ParamFlags::READWRITE,
),
glib::ParamSpecUInt::new(
"context-wait",
"Context Wait",
"Throttle poll loop to run at most once every this many ms",
0,
1000,
DEFAULT_CONTEXT_WAIT.as_millis() as u32,
glib::ParamFlags::READWRITE,
),
glib::ParamSpecObject::new(
"active-pad",
"Active Pad",
"Currently active pad",
gst::Pad::static_type(),
glib::ParamFlags::READWRITE | gst::PARAM_FLAG_MUTABLE_PLAYING,
),
]
});
PROPERTIES.as_ref()
}
fn set_property(
&self,
_obj: &Self::Type,
_id: usize,
value: &glib::Value,
pspec: &glib::ParamSpec,
) {
match pspec.name() {
"context" => {
let mut settings = self.settings.lock().unwrap();
settings.context = value
.get::<Option<String>>()
.expect("type checked upstream")
.unwrap_or_else(|| DEFAULT_CONTEXT.into());
}
"context-wait" => {
let mut settings = self.settings.lock().unwrap();
settings.context_wait = Duration::from_millis(
value.get::<u32>().expect("type checked upstream").into(),
);
}
"active-pad" => {
let pad = value
.get::<Option<gst::Pad>>()
.expect("type checked upstream");
let mut state = self.state.lock().unwrap();
let pads = self.pads.lock().unwrap();
let mut old_pad = None;
if let Some(ref pad) = pad {
if pads.sink_pads.get(pad).is_some() {
old_pad = state.active_sinkpad.clone();
state.active_sinkpad = Some(pad.clone());
state.switched_pad = true;
}
} else {
state.active_sinkpad = None;
}
drop(pads);
drop(state);
if let Some(old_pad) = old_pad {
if Some(&old_pad) != pad.as_ref() {
let _ = old_pad.push_event(gst::event::Reconfigure::new());
}
}
if let Some(pad) = pad {
let _ = pad.push_event(gst::event::Reconfigure::new());
}
}
_ => unimplemented!(),
}
}
fn property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
match pspec.name() {
"context" => {
let settings = self.settings.lock().unwrap();
settings.context.to_value()
}
"context-wait" => {
let settings = self.settings.lock().unwrap();
(settings.context_wait.as_millis() as u32).to_value()
}
"active-pad" => {
let state = self.state.lock().unwrap();
let active_pad = state.active_sinkpad.clone();
active_pad.to_value()
}
_ => unimplemented!(),
}
}
fn constructed(&self, obj: &Self::Type) {
self.parent_constructed(obj);
obj.add_pad(self.src_pad.gst_pad()).unwrap();
obj.set_element_flags(gst::ElementFlags::PROVIDE_CLOCK | gst::ElementFlags::REQUIRE_CLOCK);
}
}
impl GstObjectImpl for InputSelector {}
impl ElementImpl for InputSelector {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"Thread-sharing input selector",
"Generic",
"Simple input selector element",
"Mathieu Duponchelle <mathieu@centricular.com>",
)
});
Some(&*ELEMENT_METADATA)
}
fn pad_templates() -> &'static [gst::PadTemplate] {
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
let caps = gst::Caps::new_any();
let sink_pad_template = gst::PadTemplate::new(
"sink_%u",
gst::PadDirection::Sink,
gst::PadPresence::Request,
&caps,
)
.unwrap();
let src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&caps,
)
.unwrap();
vec![sink_pad_template, src_pad_template]
});
PAD_TEMPLATES.as_ref()
}
fn change_state(
&self,
element: &Self::Type,
transition: gst::StateChange,
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
if let gst::StateChange::ReadyToNull = transition {
self.unprepare(element);
}
let mut success = self.parent_change_state(element, transition)?;
match transition {
gst::StateChange::ReadyToPaused => {
success = gst::StateChangeSuccess::NoPreroll;
}
gst::StateChange::PlayingToPaused => {
success = gst::StateChangeSuccess::NoPreroll;
}
_ => (),
}
Ok(success)
}
fn request_new_pad(
&self,
element: &Self::Type,
templ: &gst::PadTemplate,
_name: Option<String>,
_caps: Option<&gst::Caps>,
) -> Option<gst::Pad> {
let mut state = self.state.lock().unwrap();
let mut pads = self.pads.lock().unwrap();
let sink_pad =
gst::Pad::from_template(templ, Some(format!("sink_{}", pads.pad_serial).as_str()));
pads.pad_serial += 1;
sink_pad.set_active(true).unwrap();
element.add_pad(&sink_pad).unwrap();
let sink_pad = PadSink::new(sink_pad, InputSelectorPadSinkHandler::default());
let ret = sink_pad.gst_pad().clone();
if state.active_sinkpad.is_none() {
state.active_sinkpad = Some(ret.clone());
state.switched_pad = true;
}
pads.sink_pads.insert(ret.clone(), sink_pad);
drop(pads);
drop(state);
let _ = element.post_message(gst::message::Latency::builder().src(element).build());
Some(ret)
}
fn release_pad(&self, element: &Self::Type, pad: &gst::Pad) {
let mut pads = self.pads.lock().unwrap();
let sink_pad = pads.sink_pads.remove(pad).unwrap();
drop(sink_pad);
element.remove_pad(pad).unwrap();
drop(pads);
let _ = element.post_message(gst::message::Latency::builder().src(element).build());
}
fn provide_clock(&self, _element: &Self::Type) -> Option<gst::Clock> {
Some(gst::SystemClock::obtain())
}
}
|