mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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365 lines
11 KiB
Rust
365 lines
11 KiB
Rust
// Copyright (C) 2021 Guillaume Desmottes <guillaume@desmottes.be>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
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// If a copy of the MPL was not distributed with this file, You can obtain one at
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// <https://mozilla.org/MPL/2.0/>.
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//
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// SPDX-License-Identifier: MPL-2.0
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use std::sync::{Mutex, MutexGuard};
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use once_cell::sync::Lazy;
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use gst::glib;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"textahead",
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gst::DebugColorFlags::empty(),
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Some("textahead debug category"),
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)
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});
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struct Settings {
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n_ahead: u32,
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separator: String,
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current_attributes: String,
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ahead_attributes: String,
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}
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impl Default for Settings {
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fn default() -> Self {
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Self {
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n_ahead: 1,
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separator: "\n".to_string(),
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current_attributes: "size=\"larger\"".to_string(),
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ahead_attributes: "size=\"smaller\"".to_string(),
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}
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}
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}
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struct Input {
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text: String,
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pts: Option<gst::ClockTime>,
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duration: Option<gst::ClockTime>,
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}
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#[derive(Default)]
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struct State {
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pending: Vec<Input>,
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done: bool,
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}
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pub struct TextAhead {
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sink_pad: gst::Pad,
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src_pad: gst::Pad,
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state: Mutex<State>,
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settings: Mutex<Settings>,
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}
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#[glib::object_subclass]
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impl ObjectSubclass for TextAhead {
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const NAME: &'static str = "GstTextAhead";
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type Type = super::TextAhead;
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type ParentType = gst::Element;
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fn with_class(klass: &Self::Class) -> Self {
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let templ = klass.pad_template("sink").unwrap();
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let sink_pad = gst::Pad::builder_with_template(&templ, Some("sink"))
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.chain_function(|pad, parent, buffer| {
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TextAhead::catch_panic_pad_function(
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parent,
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|| Err(gst::FlowError::Error),
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|imp, element| imp.sink_chain(pad, element, buffer),
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)
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})
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.event_function(|pad, parent, event| {
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TextAhead::catch_panic_pad_function(
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parent,
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|| false,
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|imp, element| imp.sink_event(pad, element, event),
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)
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})
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.build();
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let templ = klass.pad_template("src").unwrap();
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let src_pad = gst::Pad::builder_with_template(&templ, Some("src")).build();
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Self {
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sink_pad,
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src_pad,
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state: Mutex::new(State::default()),
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settings: Mutex::new(Settings::default()),
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}
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}
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}
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impl ObjectImpl for TextAhead {
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fn properties() -> &'static [glib::ParamSpec] {
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static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
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let default = Settings::default();
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vec![
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glib::ParamSpecUInt::builder("n-ahead")
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.nick("n-ahead")
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.blurb("The number of ahead text buffers to display along with the current one")
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.default_value(default.n_ahead)
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.mutable_playing()
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.build(),
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glib::ParamSpecString::builder("separator")
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.nick("Separator")
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.blurb("Text inserted between each text buffers")
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.default_value(Some(&default.separator))
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.mutable_playing()
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.build(),
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// See https://developer.gimp.org/api/2.0/pango/PangoMarkupFormat.html for pango attributes
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glib::ParamSpecString::builder("current-attributes")
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.nick("Current attributes")
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.blurb("Pango span attributes to set on the text from the current buffer")
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.default_value(Some(&default.current_attributes))
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.mutable_playing()
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.build(),
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glib::ParamSpecString::builder("ahead-attributes")
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.nick("Ahead attributes")
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.blurb("Pango span attributes to set on the ahead text")
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.default_value(Some(&default.ahead_attributes))
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.mutable_playing()
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.build(),
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]
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});
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PROPERTIES.as_ref()
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}
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fn set_property(
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&self,
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_obj: &Self::Type,
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_id: usize,
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value: &glib::Value,
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pspec: &glib::ParamSpec,
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) {
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let mut settings = self.settings.lock().unwrap();
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match pspec.name() {
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"n-ahead" => {
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settings.n_ahead = value.get().expect("type checked upstream");
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}
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"separator" => {
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settings.separator = value.get().expect("type checked upstream");
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}
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"current-attributes" => {
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settings.current_attributes = value.get().expect("type checked upstream");
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}
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"ahead-attributes" => {
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settings.ahead_attributes = value.get().expect("type checked upstream");
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}
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_ => unimplemented!(),
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}
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}
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fn property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
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let settings = self.settings.lock().unwrap();
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match pspec.name() {
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"n-ahead" => settings.n_ahead.to_value(),
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"separator" => settings.separator.to_value(),
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"current-attributes" => settings.current_attributes.to_value(),
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"ahead-attributes" => settings.ahead_attributes.to_value(),
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_ => unimplemented!(),
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}
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}
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fn constructed(&self, obj: &Self::Type) {
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self.parent_constructed(obj);
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obj.add_pad(&self.sink_pad).unwrap();
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obj.add_pad(&self.src_pad).unwrap();
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}
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}
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impl GstObjectImpl for TextAhead {}
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impl ElementImpl for TextAhead {
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fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
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static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
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gst::subclass::ElementMetadata::new(
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"Text Ahead",
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"Text/Filter",
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"Display upcoming text buffers ahead",
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"Guillaume Desmottes <guillaume@desmottes.be>",
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)
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});
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Some(&*ELEMENT_METADATA)
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}
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fn pad_templates() -> &'static [gst::PadTemplate] {
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static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
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let sink_caps = gst::Caps::builder("text/x-raw")
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.field("format", gst::List::new(["utf8", "pango-markup"]))
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.build();
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let sink_pad_template = gst::PadTemplate::new(
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"sink",
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gst::PadDirection::Sink,
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gst::PadPresence::Always,
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&sink_caps,
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)
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.unwrap();
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let src_caps = gst::Caps::builder("text/x-raw")
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.field("format", "pango-markup")
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.build();
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let src_pad_template = gst::PadTemplate::new(
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"src",
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gst::PadDirection::Src,
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gst::PadPresence::Always,
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&src_caps,
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)
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.unwrap();
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vec![sink_pad_template, src_pad_template]
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});
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PAD_TEMPLATES.as_ref()
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}
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fn change_state(
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&self,
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element: &Self::Type,
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transition: gst::StateChange,
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) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
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let res = self.parent_change_state(element, transition);
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match transition {
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gst::StateChange::ReadyToPaused => *self.state.lock().unwrap() = State::default(),
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gst::StateChange::PausedToReady => {
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let mut state = self.state.lock().unwrap();
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state.done = true;
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}
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_ => {}
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}
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res
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}
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}
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impl TextAhead {
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fn sink_chain(
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&self,
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_pad: &gst::Pad,
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element: &super::TextAhead,
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buffer: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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let pts = buffer.pts();
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let duration = buffer.duration();
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let buffer = buffer
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.into_mapped_buffer_readable()
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.map_err(|_| gst::FlowError::Error)?;
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let text =
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String::from_utf8(Vec::from(buffer.as_slice())).map_err(|_| gst::FlowError::Error)?;
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// queue buffer
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let mut state = self.state.lock().unwrap();
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gst::log!(CAT, obj: element, "input {:?}: {}", pts, text);
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state.pending.push(Input {
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text,
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pts,
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duration,
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});
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let n_ahead = {
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let settings = self.settings.lock().unwrap();
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settings.n_ahead as usize
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};
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// then check if we can output
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// FIXME: this won't work on live pipelines as we can't really report latency
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if state.pending.len() > n_ahead {
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self.push_pending(element, &mut state)
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} else {
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Ok(gst::FlowSuccess::Ok)
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}
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}
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fn sink_event(&self, pad: &gst::Pad, element: &super::TextAhead, event: gst::Event) -> bool {
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match event.view() {
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gst::EventView::Eos(_) => {
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let mut state = self.state.lock().unwrap();
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gst::debug!(CAT, obj: element, "eos");
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while !state.pending.is_empty() {
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let _ = self.push_pending(element, &mut state);
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}
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pad.event_default(Some(element), event)
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}
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gst::EventView::Caps(_caps) => {
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// set caps on src pad
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let templ = element.class().pad_template("src").unwrap();
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let _ = self.src_pad.push_event(gst::event::Caps::new(templ.caps()));
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true
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}
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_ => pad.event_default(Some(element), event),
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}
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}
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/// push first pending buffer as current and all the other ones as ahead text
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fn push_pending(
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&self,
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element: &super::TextAhead,
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state: &mut MutexGuard<State>,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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if state.done {
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return Err(gst::FlowError::Flushing);
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}
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let settings = self.settings.lock().unwrap();
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let first = state.pending.remove(0);
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let mut text = if settings.current_attributes.is_empty() {
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first.text
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} else {
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format!(
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"<span {}>{}</span>",
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settings.current_attributes, first.text
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)
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};
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for input in state.pending.iter() {
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if !settings.separator.is_empty() {
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text.push_str(&settings.separator);
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}
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if settings.ahead_attributes.is_empty() {
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text.push_str(&input.text);
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} else {
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use std::fmt::Write;
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write!(
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&mut text,
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"<span {}>{}</span>",
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settings.ahead_attributes, input.text,
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)
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.unwrap();
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}
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}
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gst::log!(CAT, obj: element, "output {:?}: {}", first.pts, text);
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let mut output = gst::Buffer::from_mut_slice(text.into_bytes());
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{
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let output = output.get_mut().unwrap();
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output.set_pts(first.pts);
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output.set_duration(first.duration);
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}
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self.src_pad.push(output)
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}
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}
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