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https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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277 lines
8.1 KiB
Rust
277 lines
8.1 KiB
Rust
// Copyright (C) 2020 Mathieu Duponchelle <mathieu@centricular.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
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// Boston, MA 02110-1335, USA.
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use glib::subclass::prelude::*;
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use gst::gst_log;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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use once_cell::sync::Lazy;
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use std::sync::Mutex;
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use crate::ttutils::{Cea608Mode, Chunk, Line, Lines, TextStyle};
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"tttojson",
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gst::DebugColorFlags::empty(),
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Some("Timed Text to JSON"),
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)
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});
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const DEFAULT_MODE: Cea608Mode = Cea608Mode::RollUp2;
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#[derive(Debug, Clone)]
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struct Settings {
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mode: Cea608Mode,
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}
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impl Default for Settings {
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fn default() -> Self {
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Settings { mode: DEFAULT_MODE }
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}
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}
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pub struct TtToJson {
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srcpad: gst::Pad,
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sinkpad: gst::Pad,
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settings: Mutex<Settings>,
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}
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impl TtToJson {
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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::TtToJson,
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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.into_mapped_buffer_readable().map_err(|_| {
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gst::element_error!(
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element,
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gst::ResourceError::Read,
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["Failed to map buffer readable"]
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);
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gst::FlowError::Error
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})?;
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let text = std::str::from_utf8(buffer.as_slice()).map_err(|err| {
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gst::element_error!(
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element,
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gst::ResourceError::Read,
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["Failed to map decode as utf8: {}", err]
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);
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gst::FlowError::Error
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})?;
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let mode = self.settings.lock().unwrap().mode;
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let mut lines = Lines {
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lines: Vec::new(),
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mode: Some(mode),
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clear: Some(false),
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};
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for phrase in text.lines() {
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lines.lines.push(Line {
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carriage_return: Some(true),
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column: Some(0),
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row: Some(13),
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chunks: vec![Chunk {
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// Default CEA 608 styling
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style: TextStyle::White,
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underline: false,
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text: phrase.to_string(),
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}],
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});
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}
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let json = serde_json::to_string(&lines).map_err(|err| {
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gst::element_error!(
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element,
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gst::ResourceError::Write,
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["Failed to serialize as json {}", err]
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);
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gst::FlowError::Error
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})?;
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let mut buf = gst::Buffer::from_mut_slice(json.into_bytes());
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{
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let buf_mut = buf.get_mut().unwrap();
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buf_mut.set_pts(pts);
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buf_mut.set_duration(duration);
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}
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self.srcpad.push(buf)
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}
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fn sink_event(&self, pad: &gst::Pad, element: &super::TtToJson, event: gst::Event) -> bool {
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use gst::EventView;
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gst_log!(CAT, obj: pad, "Handling event {:?}", event);
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match event.view() {
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EventView::Caps(_) => {
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// We send our own caps downstream
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let caps = gst::Caps::builder("application/x-json")
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.field("format", &"cea608")
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.build();
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self.srcpad.push_event(gst::event::Caps::new(&caps))
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}
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EventView::Eos(_) => pad.event_default(Some(element), event),
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_ => pad.event_default(Some(element), event),
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}
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}
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}
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impl ElementImpl for TtToJson {
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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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"Timed text to JSON encoder",
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"Encoder/ClosedCaption",
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"Encodes Timed Text to JSON",
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"Mathieu Duponchelle <mathieu@centricular.com>",
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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 caps = gst::Caps::builder("text/x-raw")
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.field("format", &"utf8")
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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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&caps,
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)
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.unwrap();
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let caps = gst::Caps::builder("application/x-json").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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&caps,
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)
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.unwrap();
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vec![src_pad_template, sink_pad_template]
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});
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PAD_TEMPLATES.as_ref()
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}
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}
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#[glib::object_subclass]
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impl ObjectSubclass for TtToJson {
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const NAME: &'static str = "RsTtToJson";
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type Type = super::TtToJson;
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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 sinkpad = gst::Pad::builder_with_template(&templ, Some("sink"))
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.chain_function(|pad, parent, buffer| {
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TtToJson::catch_panic_pad_function(
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parent,
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|| Err(gst::FlowError::Error),
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|enc, element| enc.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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TtToJson::catch_panic_pad_function(
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parent,
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|| false,
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|enc, element| enc.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 srcpad = gst::Pad::builder_with_template(&templ, Some("src")).build();
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Self {
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srcpad,
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sinkpad,
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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 TtToJson {
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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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vec![glib::ParamSpec::new_enum(
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"mode",
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"Mode",
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"Which mode to operate in",
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Cea608Mode::static_type(),
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DEFAULT_MODE as i32,
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glib::ParamFlags::READWRITE | gst::PARAM_FLAG_MUTABLE_READY,
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)]
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});
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PROPERTIES.as_ref()
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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.sinkpad).unwrap();
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obj.add_pad(&self.srcpad).unwrap();
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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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match pspec.name() {
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"mode" => {
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let mut settings = self.settings.lock().unwrap();
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settings.mode = value
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.get_some::<Cea608Mode>()
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.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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match pspec.name() {
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"mode" => {
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let settings = self.settings.lock().unwrap();
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settings.mode.to_value()
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}
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_ => unimplemented!(),
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}
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}
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}
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