mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-13 05:42:41 +00:00
656 lines
20 KiB
Rust
656 lines
20 KiB
Rust
// Copyright (C) 2021 OneStream Live <guillaume.desmottes@onestream.live>
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
|
|
// If a copy of the MPL was not distributed with this file, You can obtain one at
|
|
// <https://mozilla.org/MPL/2.0/>.
|
|
//
|
|
// SPDX-License-Identifier: MPL-2.0
|
|
|
|
use std::{
|
|
collections::{HashMap, VecDeque},
|
|
sync::{Arc, Mutex, MutexGuard},
|
|
};
|
|
|
|
use gst::glib;
|
|
use gst::prelude::*;
|
|
use gst::subclass::prelude::*;
|
|
|
|
use once_cell::sync::Lazy;
|
|
|
|
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
|
|
gst::DebugCategory::new(
|
|
"uriplaylistbin",
|
|
gst::DebugColorFlags::empty(),
|
|
Some("Uri Playlist Bin"),
|
|
)
|
|
});
|
|
|
|
#[derive(Debug, thiserror::Error)]
|
|
enum PlaylistError {
|
|
#[error("plugin missing: {error}")]
|
|
PluginMissing { error: anyhow::Error },
|
|
}
|
|
|
|
#[derive(Debug, Clone)]
|
|
struct Settings {
|
|
uris: Vec<String>,
|
|
iterations: u32,
|
|
}
|
|
|
|
impl Default for Settings {
|
|
fn default() -> Self {
|
|
Self {
|
|
uris: vec![],
|
|
iterations: 1,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct State {
|
|
uridecodebin: gst::Element,
|
|
playlist: Playlist,
|
|
/// next current items, updated when uridecodebin updates its current-uri property
|
|
pending_current_items: VecDeque<Option<Item>>,
|
|
current_item: Option<Item>,
|
|
/// key are src pads from uridecodebin
|
|
pads: HashMap<gst::Pad, Pads>,
|
|
|
|
// read-only properties
|
|
current_iteration: u32,
|
|
current_uri_index: u64,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct Pads {
|
|
/// requested streamsynchronizer sink pad
|
|
ss_sink: gst::Pad,
|
|
/// ghost pad of the associated src pad
|
|
ghost_src: gst::GhostPad,
|
|
}
|
|
|
|
impl State {
|
|
fn new(uris: Vec<String>, iterations: u32, uridecodebin: gst::Element) -> Self {
|
|
Self {
|
|
uridecodebin,
|
|
playlist: Playlist::new(uris, iterations),
|
|
pending_current_items: VecDeque::new(),
|
|
current_item: None,
|
|
pads: HashMap::new(),
|
|
current_iteration: 0,
|
|
current_uri_index: 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct UriPlaylistBin {
|
|
settings: Mutex<Settings>,
|
|
state: Mutex<Option<State>>,
|
|
}
|
|
|
|
#[derive(Debug, Clone)]
|
|
struct Item {
|
|
inner: Arc<Mutex<ItemInner>>,
|
|
}
|
|
|
|
impl Item {
|
|
fn new(uri: String, index: usize) -> Self {
|
|
let inner = ItemInner { uri, index };
|
|
|
|
Self {
|
|
inner: Arc::new(Mutex::new(inner)),
|
|
}
|
|
}
|
|
|
|
fn uri(&self) -> String {
|
|
let inner = self.inner.lock().unwrap();
|
|
inner.uri.clone()
|
|
}
|
|
|
|
fn index(&self) -> usize {
|
|
let inner = self.inner.lock().unwrap();
|
|
inner.index
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone)]
|
|
struct ItemInner {
|
|
uri: String,
|
|
index: usize,
|
|
}
|
|
|
|
struct Playlist {
|
|
items: Box<dyn Iterator<Item = Item> + Send>,
|
|
uris: Vec<String>,
|
|
}
|
|
|
|
impl Playlist {
|
|
fn new(uris: Vec<String>, iterations: u32) -> Self {
|
|
Self {
|
|
items: Self::create_items(uris.clone(), iterations),
|
|
uris,
|
|
}
|
|
}
|
|
|
|
fn create_items(
|
|
uris: Vec<String>,
|
|
iterations: u32,
|
|
) -> Box<dyn Iterator<Item = Item> + Send + Sync> {
|
|
fn infinite_iter(uris: Vec<String>) -> Box<dyn Iterator<Item = Item> + Send + Sync> {
|
|
Box::new(
|
|
uris.into_iter()
|
|
.cycle()
|
|
.enumerate()
|
|
.map(|(index, uri)| Item::new(uri, index)),
|
|
)
|
|
}
|
|
fn finite_iter(
|
|
uris: Vec<String>,
|
|
iterations: u32,
|
|
) -> Box<dyn Iterator<Item = Item> + Send + Sync> {
|
|
let n = (iterations as usize)
|
|
.checked_mul(uris.len())
|
|
.unwrap_or(usize::MAX);
|
|
|
|
Box::new(
|
|
uris.into_iter()
|
|
.cycle()
|
|
.take(n)
|
|
.enumerate()
|
|
.map(|(index, uri)| Item::new(uri, index)),
|
|
)
|
|
}
|
|
|
|
if iterations == 0 {
|
|
infinite_iter(uris)
|
|
} else {
|
|
finite_iter(uris, iterations)
|
|
}
|
|
}
|
|
|
|
fn next(&mut self) -> Option<Item> {
|
|
let item = match self.items.next() {
|
|
None => return None,
|
|
Some(item) => item,
|
|
};
|
|
|
|
if item.index() == usize::MAX {
|
|
// prevent overflow with infinite playlist
|
|
self.items = Self::create_items(self.uris.clone(), 0);
|
|
}
|
|
|
|
Some(item)
|
|
}
|
|
}
|
|
|
|
impl std::fmt::Debug for Playlist {
|
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
|
f.debug_struct("Playlist")
|
|
.field("uris", &self.uris)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
#[glib::object_subclass]
|
|
impl ObjectSubclass for UriPlaylistBin {
|
|
const NAME: &'static str = "GstUriPlaylistBin";
|
|
type Type = super::UriPlaylistBin;
|
|
type ParentType = gst::Bin;
|
|
}
|
|
|
|
impl ObjectImpl for UriPlaylistBin {
|
|
fn properties() -> &'static [glib::ParamSpec] {
|
|
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
|
|
vec![
|
|
glib::ParamSpecBoxed::builder::<Vec<String>>("uris")
|
|
.nick("URIs")
|
|
.blurb("URIs of the medias to play")
|
|
.mutable_ready()
|
|
.build(),
|
|
glib::ParamSpecUInt::builder("iterations")
|
|
.nick("Iterations")
|
|
.blurb("Number of time the playlist items should be played each (0 = unlimited)")
|
|
.default_value(1)
|
|
.mutable_ready()
|
|
.build(),
|
|
glib::ParamSpecUInt::builder("current-iteration")
|
|
.nick("Current iteration")
|
|
.blurb("The index of the current playlist iteration, or 0 if the iterations property is 0 (unlimited playlist)")
|
|
.read_only()
|
|
.build(),
|
|
glib::ParamSpecUInt64::builder("current-uri-index")
|
|
.nick("Current URI")
|
|
.blurb("The index from the uris property of the current URI being played")
|
|
.read_only()
|
|
.build(),
|
|
]
|
|
});
|
|
|
|
PROPERTIES.as_ref()
|
|
}
|
|
|
|
fn set_property(&self, _id: usize, value: &glib::Value, pspec: &glib::ParamSpec) {
|
|
match pspec.name() {
|
|
"uris" => {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
let new_value = value.get().expect("type checked upstream");
|
|
gst::info!(
|
|
CAT,
|
|
imp: self,
|
|
"Changing uris from {:?} to {:?}",
|
|
settings.uris,
|
|
new_value,
|
|
);
|
|
settings.uris = new_value;
|
|
}
|
|
"iterations" => {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
let new_value = value.get().expect("type checked upstream");
|
|
gst::info!(
|
|
CAT,
|
|
imp: self,
|
|
"Changing iterations from {:?} to {:?}",
|
|
settings.iterations,
|
|
new_value,
|
|
);
|
|
settings.iterations = new_value;
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
|
|
match pspec.name() {
|
|
"uris" => {
|
|
let settings = self.settings.lock().unwrap();
|
|
settings.uris.to_value()
|
|
}
|
|
"iterations" => {
|
|
let settings = self.settings.lock().unwrap();
|
|
settings.iterations.to_value()
|
|
}
|
|
"current-iteration" => {
|
|
let state = self.state.lock().unwrap();
|
|
state
|
|
.as_ref()
|
|
.map(|state| state.current_iteration)
|
|
.unwrap_or(0)
|
|
.to_value()
|
|
}
|
|
"current-uri-index" => {
|
|
let state = self.state.lock().unwrap();
|
|
state
|
|
.as_ref()
|
|
.map(|state| state.current_uri_index)
|
|
.unwrap_or(0)
|
|
.to_value()
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn constructed(&self) {
|
|
self.parent_constructed();
|
|
|
|
let obj = self.obj();
|
|
obj.set_suppressed_flags(gst::ElementFlags::SOURCE | gst::ElementFlags::SINK);
|
|
obj.set_element_flags(gst::ElementFlags::SOURCE);
|
|
}
|
|
}
|
|
|
|
impl GstObjectImpl for UriPlaylistBin {}
|
|
|
|
impl BinImpl for UriPlaylistBin {
|
|
fn handle_message(&self, msg: gst::Message) {
|
|
match msg.view() {
|
|
gst::MessageView::Error(err) => {
|
|
let item = {
|
|
let state_guard = self.state.lock().unwrap();
|
|
let state = state_guard.as_ref().unwrap();
|
|
|
|
// uridecodebin likely failed because of the last URI we set
|
|
match state.pending_current_items.iter().last() {
|
|
Some(Some(item)) => Some(item.clone()),
|
|
_ => state.current_item.clone(),
|
|
}
|
|
};
|
|
|
|
if let Some(item) = item {
|
|
// add the URI of the failed item
|
|
let txt = format!(
|
|
"Error when processing item #{} ({}): {}",
|
|
item.index(),
|
|
item.uri(),
|
|
err.error()
|
|
);
|
|
let mut details = err
|
|
.details()
|
|
.map_or(gst::Structure::new_empty("details"), |s| s.to_owned());
|
|
details.set("uri", item.uri());
|
|
|
|
let msg = gst::message::Error::builder(gst::LibraryError::Failed, &txt)
|
|
.details(details)
|
|
.build();
|
|
|
|
self.parent_handle_message(msg)
|
|
} else {
|
|
self.parent_handle_message(msg)
|
|
}
|
|
}
|
|
_ => self.parent_handle_message(msg),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ElementImpl for UriPlaylistBin {
|
|
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
|
|
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
|
|
gst::subclass::ElementMetadata::new(
|
|
"Playlist Source",
|
|
"Generic/Source",
|
|
"Sequentially play uri streams",
|
|
"Guillaume Desmottes <guillaume.desmottes@onestream.live>",
|
|
)
|
|
});
|
|
|
|
Some(&*ELEMENT_METADATA)
|
|
}
|
|
|
|
fn pad_templates() -> &'static [gst::PadTemplate] {
|
|
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
|
|
let audio_src_pad_template = gst::PadTemplate::new(
|
|
"audio_%u",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Sometimes,
|
|
&gst::Caps::new_any(),
|
|
)
|
|
.unwrap();
|
|
|
|
let video_src_pad_template = gst::PadTemplate::new(
|
|
"video_%u",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Sometimes,
|
|
&gst::Caps::new_any(),
|
|
)
|
|
.unwrap();
|
|
|
|
let text_src_pad_template = gst::PadTemplate::new(
|
|
"text_%u",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Sometimes,
|
|
&gst::Caps::new_any(),
|
|
)
|
|
.unwrap();
|
|
|
|
vec![
|
|
audio_src_pad_template,
|
|
video_src_pad_template,
|
|
text_src_pad_template,
|
|
]
|
|
});
|
|
|
|
PAD_TEMPLATES.as_ref()
|
|
}
|
|
|
|
fn change_state(
|
|
&self,
|
|
transition: gst::StateChange,
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
if transition == gst::StateChange::NullToReady {
|
|
if let Err(e) = self.start() {
|
|
self.failed(e);
|
|
return Err(gst::StateChangeError);
|
|
}
|
|
}
|
|
|
|
let res = self.parent_change_state(transition);
|
|
|
|
if transition == gst::StateChange::ReadyToNull {
|
|
self.stop();
|
|
}
|
|
|
|
res
|
|
}
|
|
}
|
|
|
|
impl UriPlaylistBin {
|
|
fn start(&self) -> Result<(), PlaylistError> {
|
|
gst::debug!(CAT, imp: self, "Starting");
|
|
{
|
|
let mut state_guard = self.state.lock().unwrap();
|
|
assert!(state_guard.is_none());
|
|
|
|
let uridecodebin = gst::ElementFactory::make("uridecodebin3")
|
|
.name("playlist-uridecodebin")
|
|
.build()
|
|
.map_err(|e| PlaylistError::PluginMissing { error: e.into() })?;
|
|
|
|
let streamsynchronizer = gst::ElementFactory::make("streamsynchronizer")
|
|
.name("playlist-streamsynchronizer")
|
|
.build()
|
|
.map_err(|e| PlaylistError::PluginMissing { error: e.into() })?;
|
|
|
|
self.obj().add(&uridecodebin).unwrap();
|
|
self.obj().add(&streamsynchronizer).unwrap();
|
|
|
|
let bin_weak = self.obj().downgrade();
|
|
let streamsynchronizer_clone = streamsynchronizer.clone();
|
|
uridecodebin.connect_pad_added(move |_uridecodebin, src_pad| {
|
|
let Some(bin) = bin_weak.upgrade() else {
|
|
return;
|
|
};
|
|
|
|
gst::debug!(
|
|
CAT,
|
|
obj: bin,
|
|
"uridecodebin src pad added: {}",
|
|
src_pad.name()
|
|
);
|
|
|
|
// connect the pad to streamsynchronizer
|
|
let ss_sink = streamsynchronizer_clone
|
|
.request_pad_simple("sink_%u")
|
|
.unwrap();
|
|
src_pad.link(&ss_sink).unwrap();
|
|
let src_pad_name = ss_sink.name().to_string().replace("sink", "src");
|
|
|
|
// ghost the associated streamsynchronizer src pad
|
|
let ss_src = streamsynchronizer_clone.static_pad(&src_pad_name).unwrap();
|
|
|
|
let ghost_src = gst::GhostPad::builder_with_target(&ss_src)
|
|
.unwrap()
|
|
.name(src_pad.name().as_str())
|
|
.build();
|
|
|
|
ghost_src.set_active(true).unwrap();
|
|
bin.add_pad(&ghost_src).unwrap();
|
|
|
|
{
|
|
let mut state_guard = bin.imp().state.lock().unwrap();
|
|
let state = state_guard.as_mut().unwrap();
|
|
|
|
state
|
|
.pads
|
|
.insert(src_pad.clone(), Pads { ss_sink, ghost_src });
|
|
}
|
|
});
|
|
|
|
let bin_weak = self.obj().downgrade();
|
|
uridecodebin.connect_pad_removed(move |_uridecodebin, src_pad| {
|
|
let Some(bin) = bin_weak.upgrade() else {
|
|
return;
|
|
};
|
|
|
|
gst::debug!(
|
|
CAT,
|
|
obj: bin,
|
|
"uridecodebin src pad removed: {}",
|
|
src_pad.name()
|
|
);
|
|
|
|
{
|
|
let mut state_guard = bin.imp().state.lock().unwrap();
|
|
let state = state_guard.as_mut().unwrap();
|
|
|
|
if let Some(pads) = state.pads.remove(src_pad) {
|
|
streamsynchronizer.release_request_pad(&pads.ss_sink);
|
|
|
|
pads.ghost_src.set_active(false).unwrap();
|
|
let _ = pads.ghost_src.set_target(None::<&gst::Pad>);
|
|
let _ = bin.remove_pad(&pads.ghost_src);
|
|
}
|
|
}
|
|
});
|
|
|
|
let bin_weak = self.obj().downgrade();
|
|
uridecodebin.connect("about-to-finish", false, move |_args| {
|
|
let bin = bin_weak.upgrade()?;
|
|
let self_ = bin.imp();
|
|
|
|
gst::debug!(CAT, obj: bin, "current URI about to finish");
|
|
|
|
let _ = self_.start_next_item();
|
|
|
|
None
|
|
});
|
|
|
|
let bin_weak = self.obj().downgrade();
|
|
uridecodebin.connect_notify(Some("current-uri"), move |_uridecodebin, _param| {
|
|
// new current URI, update pending current item if needed
|
|
let Some(bin) = bin_weak.upgrade() else {
|
|
return;
|
|
};
|
|
let self_ = bin.imp();
|
|
|
|
let mut state_guard = self_.state.lock().unwrap();
|
|
let state = state_guard.as_mut().unwrap();
|
|
|
|
if let Some(new_current_item) = state.pending_current_items.pop_front() {
|
|
self_.update_current(state_guard, new_current_item);
|
|
}
|
|
});
|
|
|
|
let settings = self.settings.lock().unwrap();
|
|
|
|
*state_guard = Some(State::new(
|
|
settings.uris.clone(),
|
|
settings.iterations,
|
|
uridecodebin,
|
|
));
|
|
}
|
|
|
|
self.start_next_item()?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn start_next_item(&self) -> Result<(), PlaylistError> {
|
|
let mut state_guard = self.state.lock().unwrap();
|
|
let state = state_guard.as_mut().unwrap();
|
|
|
|
let item = match state.playlist.next() {
|
|
Some(item) => item,
|
|
None => {
|
|
gst::debug!(CAT, imp: self, "no more item to queue",);
|
|
|
|
state.pending_current_items.push_back(None);
|
|
return Ok(());
|
|
}
|
|
};
|
|
|
|
gst::debug!(
|
|
CAT,
|
|
imp: self,
|
|
"start next item #{}: {}",
|
|
item.index(),
|
|
item.uri()
|
|
);
|
|
|
|
// don't hold the mutex when updating `uri` to prevent deadlocks.
|
|
let uridecodebin = state.uridecodebin.clone();
|
|
let uri = item.uri();
|
|
|
|
state.pending_current_items.push_back(Some(item));
|
|
|
|
drop(state_guard);
|
|
uridecodebin.set_property("uri", uri);
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn update_current(&self, mut state_guard: MutexGuard<Option<State>>, current: Option<Item>) {
|
|
let (uris_len, infinite) = {
|
|
let settings = self.settings.lock().unwrap();
|
|
|
|
(settings.uris.len(), settings.iterations == 0)
|
|
};
|
|
|
|
if let Some(state) = state_guard.as_mut() {
|
|
state.current_item = current;
|
|
|
|
if let Some(current) = state.current_item.as_ref() {
|
|
let (mut current_iteration, current_uri_index) = (
|
|
(current.index() / uris_len) as u32,
|
|
(current.index() % uris_len) as u64,
|
|
);
|
|
|
|
if infinite {
|
|
current_iteration = 0;
|
|
}
|
|
|
|
let element = self.obj();
|
|
let mut notify_iteration = false;
|
|
let mut notify_index = false;
|
|
|
|
if current_iteration != state.current_iteration {
|
|
state.current_iteration = current_iteration;
|
|
notify_iteration = true;
|
|
}
|
|
if current_uri_index != state.current_uri_index {
|
|
state.current_uri_index = current_uri_index;
|
|
notify_index = true;
|
|
}
|
|
|
|
// drop mutex before notifying changes as the callback will likely try to fetch the updated values
|
|
// which would deadlock.
|
|
drop(state_guard);
|
|
|
|
if notify_iteration {
|
|
element.notify("current-iteration");
|
|
}
|
|
if notify_index {
|
|
element.notify("current-uri-index");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn failed(&self, error: PlaylistError) {
|
|
let error_msg = error.to_string();
|
|
gst::error!(CAT, imp: self, "{}", error_msg);
|
|
|
|
match error {
|
|
PlaylistError::PluginMissing { .. } => {
|
|
gst::element_imp_error!(self, gst::CoreError::MissingPlugin, ["{}", &error_msg]);
|
|
}
|
|
}
|
|
|
|
self.update_current(self.state.lock().unwrap(), None);
|
|
}
|
|
|
|
fn stop(&self) {
|
|
// remove all children and pads
|
|
let children = self.obj().children();
|
|
let children_ref = children.iter().collect::<Vec<_>>();
|
|
self.obj().remove_many(children_ref).unwrap();
|
|
|
|
for pad in self.obj().src_pads() {
|
|
self.obj().remove_pad(&pad).unwrap();
|
|
}
|
|
|
|
let mut state_guard = self.state.lock().unwrap();
|
|
*state_guard = None;
|
|
}
|
|
}
|