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fallbacksrc: Implement support for fallback streams

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This commit is contained in:
Sebastian Dröge 2022-08-19 17:34:17 +03:00
parent 00411523d4
commit 38753b08ac
5 changed files with 1472 additions and 1065 deletions
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4
docs/plugins/gst_plugins_cache.json
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@ -1017,7 +1017,7 @@
"elements": {
"fallbacksrc": {
"author": "Sebastian Dröge <sebastian@centricular.com>",
"description": "Live source with uridecodebin3 or custom source, and fallback image stream",
"description": "Live source with uridecodebin3 or custom source, and fallback stream",
"hierarchy": [
"FallbackSrc",
"GstBin",
@ -1213,7 +1213,7 @@
"construct": false,
"construct-only": false,
"controllable": false,
"default": "application/x-fallbacksrc-stats, num-retry=(guint64)0, last-retry-reason=(GstFallbackSourceRetryReason)none, buffering-percent=(int)100;",
"default": "application/x-fallbacksrc-stats, num-retry=(guint64)0, num-fallback-retry=(guint64)0, last-retry-reason=(GstFallbackSourceRetryReason)none, last-fallback-retry-reason=(GstFallbackSourceRetryReason)none, buffering-percent=(int)100, fallback-buffering-percent=(int)100;",
"mutable": "null",
"readable": true,
"type": "GstStructure",

2046
utils/fallbackswitch/src/fallbacksrc/imp.rs
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File diff suppressed because it is too large Load diff

1
utils/fallbackswitch/src/fallbacksrc/mod.rs
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@ -11,7 +11,6 @@ use gst::prelude::*;
mod custom_source;
mod imp;
mod video_fallback;
#[derive(Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Clone, Copy, glib::Enum)]
#[repr(u32)]

464
utils/fallbackswitch/src/fallbacksrc/video_fallback/imp.rs
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@ -1,464 +0,0 @@
// Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
//
// 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 gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
use std::sync::{atomic::AtomicBool, atomic::Ordering, Mutex};
use once_cell::sync::Lazy;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"fallbacksrc-video-source",
gst::DebugColorFlags::empty(),
Some("Fallback Video Source Bin"),
)
});
#[derive(Debug, Clone)]
struct Settings {
uri: Option<String>,
min_latency: gst::ClockTime,
}
impl Default for Settings {
fn default() -> Self {
Settings {
uri: None,
min_latency: gst::ClockTime::ZERO,
}
}
}
struct State {
source: gst::Element,
}
pub struct VideoFallbackSource {
srcpad: gst::GhostPad,
got_error: AtomicBool,
state: Mutex<Option<State>>,
settings: Mutex<Settings>,
}
#[glib::object_subclass]
impl ObjectSubclass for VideoFallbackSource {
const NAME: &'static str = "FallbackSrcVideoFallbackSource";
type Type = super::VideoFallbackSource;
type ParentType = gst::Bin;
fn with_class(klass: &Self::Class) -> Self {
let templ = klass.pad_template("src").unwrap();
let srcpad = gst::GhostPad::builder_with_template(&templ, Some(&templ.name())).build();
Self {
srcpad,
got_error: AtomicBool::new(false),
state: Mutex::new(None),
settings: Mutex::new(Settings::default()),
}
}
}
impl ObjectImpl for VideoFallbackSource {
fn properties() -> &'static [glib::ParamSpec] {
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
vec![
glib::ParamSpecString::builder("uri")
.nick("URI")
.blurb("URI to use for video in case the main stream doesn't work")
.build(),
glib::ParamSpecUInt64::builder("min-latency")
.nick("Minimum Latency")
.blurb("Minimum Latency")
.build(),
]
});
PROPERTIES.as_ref()
}
fn set_property(
&self,
obj: &Self::Type,
_id: usize,
value: &glib::Value,
pspec: &glib::ParamSpec,
) {
match pspec.name() {
"uri" => {
let mut settings = self.settings.lock().unwrap();
let new_value = value.get().expect("type checked upstream");
gst::info!(
CAT,
obj: obj,
"Changing URI from {:?} to {:?}",
settings.uri,
new_value,
);
settings.uri = new_value;
}
"min-latency" => {
let mut settings = self.settings.lock().unwrap();
let new_value = value.get().expect("type checked upstream");
gst::info!(
CAT,
obj: obj,
"Changing Minimum Latency from {} to {}",
settings.min_latency,
new_value,
);
settings.min_latency = new_value;
}
_ => unreachable!(),
}
}
fn property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
match pspec.name() {
"uri" => {
let settings = self.settings.lock().unwrap();
settings.uri.to_value()
}
"min-latency" => {
let settings = self.settings.lock().unwrap();
settings.min_latency.to_value()
}
_ => unimplemented!(),
}
}
fn constructed(&self, obj: &Self::Type) {
self.parent_constructed(obj);
obj.set_suppressed_flags(gst::ElementFlags::SOURCE | gst::ElementFlags::SINK);
obj.set_element_flags(gst::ElementFlags::SOURCE);
obj.add_pad(&self.srcpad).unwrap();
}
}
impl GstObjectImpl for VideoFallbackSource {}
impl ElementImpl for VideoFallbackSource {
fn pad_templates() -> &'static [gst::PadTemplate] {
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
let src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&gst::Caps::new_any(),
)
.unwrap();
vec![src_pad_template]
});
PAD_TEMPLATES.as_ref()
}
#[allow(clippy::single_match)]
fn change_state(
&self,
element: &Self::Type,
transition: gst::StateChange,
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
match transition {
gst::StateChange::NullToReady => {
self.start(element)?;
}
_ => (),
}
self.parent_change_state(element, transition)?;
match transition {
gst::StateChange::ReadyToNull => {
self.stop(element);
}
_ => (),
}
Ok(gst::StateChangeSuccess::Success)
}
}
impl BinImpl for VideoFallbackSource {
#[allow(clippy::single_match)]
fn handle_message(&self, bin: &Self::Type, msg: gst::Message) {
use gst::MessageView;
match msg.view() {
MessageView::Error(err) => {
if self
.got_error
.compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
.is_err()
{
gst::warning!(CAT, obj: bin, "Got error {:?}", err);
self.parent_handle_message(bin, msg)
} else {
// Suppress error message if we posted error previously.
// Otherwise parent fallbacksrc would be confused by
// multiple error message.
gst::debug!(CAT, obj: bin, "Ignore error {:?}", err);
}
}
_ => self.parent_handle_message(bin, msg),
}
}
}
impl VideoFallbackSource {
fn file_src_for_uri(
&self,
element: &super::VideoFallbackSource,
uri: Option<&str>,
) -> Option<gst::Element> {
uri?;
let uri = uri.unwrap();
let filesrc = gst::ElementFactory::make("filesrc", Some("fallback_filesrc"))
.expect("No filesrc found");
if let Err(err) = filesrc
.dynamic_cast_ref::<gst::URIHandler>()
.unwrap()
.set_uri(uri)
{
gst::warning!(CAT, obj: element, "Failed to set URI: {}", err);
return None;
}
if filesrc.set_state(gst::State::Ready).is_err() {
gst::warning!(CAT, obj: element, "Couldn't set state READY");
let _ = filesrc.set_state(gst::State::Null);
return None;
}
// To invoke GstBaseSrc::start() method, activate pad manually.
// filesrc will check whether given file is readable or not
// via open() and fstat() in there.
let pad = filesrc.static_pad("src").unwrap();
if pad.set_active(true).is_err() {
gst::warning!(CAT, obj: element, "Couldn't active pad");
let _ = filesrc.set_state(gst::State::Null);
return None;
}
Some(filesrc)
}
fn create_source(
&self,
element: &super::VideoFallbackSource,
min_latency: gst::ClockTime,
uri: Option<&str>,
) -> gst::Element {
gst::debug!(CAT, obj: element, "Creating source with uri {:?}", uri);
let source = gst::Bin::new(None);
let filesrc = self.file_src_for_uri(element, uri);
let srcpad = match filesrc {
Some(filesrc) => {
let typefind = gst::ElementFactory::make("typefind", Some("fallback_typefind"))
.expect("No typefind found");
let videoconvert =
gst::ElementFactory::make("videoconvert", Some("fallback_videoconvert"))
.expect("No videoconvert found");
let videoscale =
gst::ElementFactory::make("videoscale", Some("fallback_videoscale"))
.expect("No videoscale found");
let imagefreeze =
gst::ElementFactory::make("imagefreeze", Some("fallback_imagefreeze"))
.expect("No imagefreeze found");
let clocksync = gst::ElementFactory::make("clocksync", Some("fallback_clocksync"))
.or_else(|_| -> Result<_, glib::BoolError> {
let identity =
gst::ElementFactory::make("identity", Some("fallback_clocksync"))?;
identity.set_property("sync", true);
Ok(identity)
})
.expect("No clocksync or identity found");
let queue = gst::ElementFactory::make("queue", Some("fallback_queue"))
.expect("No queue found");
queue.set_properties(&[
("max-size-buffers", &0u32),
("max-size-bytes", &0u32),
(
"max-size-time",
&min_latency.max(5 * gst::ClockTime::SECOND).nseconds(),
),
]);
source
.add_many(&[
&filesrc,
&typefind,
&videoconvert,
&videoscale,
&imagefreeze,
&clocksync,
&queue,
])
.unwrap();
gst::Element::link_many(&[&filesrc, &typefind]).unwrap();
gst::Element::link_many(&[
&videoconvert,
&videoscale,
&imagefreeze,
&clocksync,
&queue,
])
.unwrap();
if imagefreeze.try_set_property("is-live", true).is_err() {
gst::error!(
CAT,
obj: element,
"imagefreeze does not support live mode, this will probably misbehave"
);
gst::element_warning!(
element,
gst::LibraryError::Settings,
["imagefreeze does not support live mode, this will probably misbehave"]
);
}
let element_weak = element.downgrade();
let source_weak = source.downgrade();
let videoconvert_weak = videoconvert.downgrade();
typefind.connect("have-type", false, move |args| {
let typefind = args[0].get::<gst::Element>().unwrap();
let _probability = args[1].get::<u32>().unwrap();
let caps = args[2].get::<gst::Caps>().unwrap();
let element = match element_weak.upgrade() {
Some(element) => element,
None => return None,
};
let source = match source_weak.upgrade() {
Some(element) => element,
None => return None,
};
let videoconvert = match videoconvert_weak.upgrade() {
Some(element) => element,
None => return None,
};
let s = caps.structure(0).unwrap();
let decoder;
if s.name() == "image/jpeg" {
decoder = gst::ElementFactory::make("jpegdec", Some("decoder"))
.expect("jpegdec not found");
} else if s.name() == "image/png" {
decoder = gst::ElementFactory::make("pngdec", Some("decoder"))
.expect("pngdec not found");
} else {
gst::error!(CAT, obj: &element, "Unsupported caps {}", caps);
gst::element_error!(
element,
gst::StreamError::Format,
["Unsupported caps {}", caps]
);
return None;
}
source.add(&decoder).unwrap();
decoder.sync_state_with_parent().unwrap();
if let Err(_err) =
gst::Element::link_many(&[&typefind, &decoder, &videoconvert])
{
gst::error!(CAT, obj: &element, "Can't link fallback image decoder");
gst::element_error!(
element,
gst::StreamError::Format,
["Can't link fallback image decoder"]
);
return None;
}
None
});
queue.static_pad("src").unwrap()
}
None => {
let videotestsrc =
gst::ElementFactory::make("videotestsrc", Some("fallback_videosrc"))
.expect("No videotestsrc found");
source.add_many(&[&videotestsrc]).unwrap();
videotestsrc.set_property_from_str("pattern", "black");
videotestsrc.set_property("is-live", true);
videotestsrc.static_pad("src").unwrap()
}
};
source
.add_pad(
&gst::GhostPad::builder(Some("src"), gst::PadDirection::Src)
.build_with_target(&srcpad)
.unwrap(),
)
.unwrap();
source.upcast()
}
fn start(
&self,
element: &super::VideoFallbackSource,
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
gst::debug!(CAT, obj: element, "Starting");
let mut state_guard = self.state.lock().unwrap();
if state_guard.is_some() {
gst::error!(CAT, obj: element, "State struct wasn't cleared");
return Err(gst::StateChangeError);
}
let settings = self.settings.lock().unwrap().clone();
let uri = &settings.uri;
let source = self.create_source(element, settings.min_latency, uri.as_deref());
element.add(&source).unwrap();
let srcpad = source.static_pad("src").unwrap();
let _ = self.srcpad.set_target(Some(&srcpad));
*state_guard = Some(State { source });
Ok(gst::StateChangeSuccess::Success)
}
fn stop(&self, element: &super::VideoFallbackSource) {
gst::debug!(CAT, obj: element, "Stopping");
let mut state_guard = self.state.lock().unwrap();
let state = match state_guard.take() {
Some(state) => state,
None => return,
};
drop(state_guard);
let _ = state.source.set_state(gst::State::Null);
let _ = self.srcpad.set_target(None::<&gst::Pad>);
element.remove(&state.source).unwrap();
self.got_error.store(false, Ordering::Relaxed);
gst::debug!(CAT, obj: element, "Stopped");
}
}

22
utils/fallbackswitch/src/fallbacksrc/video_fallback/mod.rs
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@ -1,22 +0,0 @@
// Copyright (C) 2020 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2020 Seungha Yang <seungha@centricular.com>
//
// 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 gst::glib;
mod imp;
glib::wrapper! {
pub struct VideoFallbackSource(ObjectSubclass<imp::VideoFallbackSource>) @extends gst::Bin, gst::Element, gst::Object;
}
impl VideoFallbackSource {
pub fn new(uri: Option<&str>, min_latency: gst::ClockTime) -> VideoFallbackSource {
glib::Object::new(&[("uri", &uri), ("min-latency", &min_latency.nseconds())]).unwrap()
}
}