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|
// SPDX-License-Identifier: MPL-2.0
use crate::streamproducer::InterStreamProducer;
use anyhow::Error;
use gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
use std::sync::Mutex;
use once_cell::sync::Lazy;
const DEFAULT_PRODUCER_NAME: &str = "default";
#[derive(Debug)]
struct Settings {
producer_name: String,
}
impl Default for Settings {
fn default() -> Self {
Settings {
producer_name: DEFAULT_PRODUCER_NAME.to_string(),
}
}
}
struct State {
srcpad: gst::GhostPad,
appsrc: gst_app::AppSrc,
}
/* Locking order is field order */
pub struct InterSrc {
settings: Mutex<Settings>,
state: Mutex<State>,
}
impl InterSrc {
fn prepare(&self) -> Result<(), Error> {
let settings = self.settings.lock().unwrap();
let state = self.state.lock().unwrap();
InterStreamProducer::subscribe(&settings.producer_name, &state.appsrc);
Ok(())
}
fn unprepare(&self) {
let settings = self.settings.lock().unwrap();
let state = self.state.lock().unwrap();
InterStreamProducer::unsubscribe(&settings.producer_name, &state.appsrc);
}
}
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new("intersrc", gst::DebugColorFlags::empty(), Some("Inter Src"))
});
#[glib::object_subclass]
impl ObjectSubclass for InterSrc {
const NAME: &'static str = "GstInterSrc";
type Type = super::InterSrc;
type ParentType = gst::Bin;
fn with_class(klass: &Self::Class) -> Self {
let templ = klass.pad_template("src").unwrap();
let srcpad = gst::GhostPad::from_template(&templ);
Self {
settings: Mutex::new(Default::default()),
state: Mutex::new(State {
srcpad: srcpad.upcast(),
appsrc: gst_app::AppSrc::builder().name("appsrc").build(),
}),
}
}
}
impl ObjectImpl for InterSrc {
fn properties() -> &'static [glib::ParamSpec] {
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
vec![glib::ParamSpecString::builder("producer-name")
.nick("Producer Name")
.blurb("Producer Name to consume from")
.doc_show_default()
.mutable_playing()
.build()]
});
PROPERTIES.as_ref()
}
fn set_property(&self, _id: usize, value: &glib::Value, pspec: &glib::ParamSpec) {
match pspec.name() {
"producer-name" => {
let mut settings = self.settings.lock().unwrap();
let old_producer_name = settings.producer_name.clone();
settings.producer_name = value
.get::<String>()
.unwrap_or_else(|_| DEFAULT_PRODUCER_NAME.to_string());
let state = self.state.lock().unwrap();
if InterStreamProducer::unsubscribe(&old_producer_name, &state.appsrc) {
InterStreamProducer::subscribe(&settings.producer_name, &state.appsrc);
}
}
_ => unimplemented!(),
};
}
fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
match pspec.name() {
"producer-name" => {
let settings = self.settings.lock().unwrap();
settings.producer_name.to_value()
}
_ => unimplemented!(),
}
}
fn constructed(&self) {
self.parent_constructed();
let obj = self.obj();
obj.set_suppressed_flags(gst::ElementFlags::SINK | gst::ElementFlags::SOURCE);
obj.set_element_flags(gst::ElementFlags::SOURCE);
let state = self.state.lock().unwrap();
gst_utils::StreamProducer::configure_consumer(&state.appsrc);
obj.add(&state.appsrc).unwrap();
obj.add_pad(&state.srcpad).unwrap();
state
.srcpad
.set_target(Some(&state.appsrc.static_pad("src").unwrap()))
.unwrap();
}
}
impl GstObjectImpl for InterSrc {}
impl ElementImpl for InterSrc {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"Inter Src",
"Generic/Src",
"Inter Src",
"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 src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&caps,
)
.unwrap();
vec![src_pad_template]
});
PAD_TEMPLATES.as_ref()
}
fn change_state(
&self,
transition: gst::StateChange,
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
gst::trace!(CAT, imp: self, "Changing state {:?}", transition);
if transition == gst::StateChange::ReadyToPaused {
if let Err(err) = self.prepare() {
gst::element_error!(
self.obj(),
gst::StreamError::Failed,
["Failed to prepare: {}", err]
);
return Err(gst::StateChangeError);
}
}
let ret = self.parent_change_state(transition)?;
if transition == gst::StateChange::PausedToReady {
self.unprepare();
}
Ok(ret)
}
}
impl BinImpl for InterSrc {}
|
