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