mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-11-15 23:01:02 +00:00
721 lines
24 KiB
Rust
721 lines
24 KiB
Rust
// 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 gst::glib;
|
|
use gst::prelude::*;
|
|
use gst::subclass::prelude::*;
|
|
use gst::{gst_error, gst_info, gst_log, gst_trace, gst_warning};
|
|
use gst_video::prelude::*;
|
|
|
|
use once_cell::sync::Lazy;
|
|
|
|
use std::sync::Mutex;
|
|
|
|
use pango::prelude::*;
|
|
|
|
use crate::caption_frame::{CaptionFrame, Status};
|
|
use crate::ccutils::extract_cdp;
|
|
|
|
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
|
|
gst::DebugCategory::new(
|
|
"cea608overlay",
|
|
gst::DebugColorFlags::empty(),
|
|
Some("CEA 608 overlay element"),
|
|
)
|
|
});
|
|
|
|
const DEFAULT_FIELD: i32 = -1;
|
|
const DEFAULT_BLACK_BACKGROUND: bool = false;
|
|
|
|
#[derive(Debug)]
|
|
struct Settings {
|
|
field: i32,
|
|
black_background: bool,
|
|
}
|
|
|
|
impl Default for Settings {
|
|
fn default() -> Self {
|
|
Settings {
|
|
field: DEFAULT_FIELD,
|
|
black_background: DEFAULT_BLACK_BACKGROUND,
|
|
}
|
|
}
|
|
}
|
|
|
|
struct State {
|
|
video_info: Option<gst_video::VideoInfo>,
|
|
layout: Option<pango::Layout>,
|
|
caption_frame: CaptionFrame,
|
|
composition: Option<gst_video::VideoOverlayComposition>,
|
|
left_alignment: i32,
|
|
attach: bool,
|
|
selected_field: Option<u8>,
|
|
}
|
|
|
|
impl Default for State {
|
|
fn default() -> Self {
|
|
Self {
|
|
video_info: None,
|
|
layout: None,
|
|
caption_frame: CaptionFrame::default(),
|
|
composition: None,
|
|
left_alignment: 0,
|
|
attach: false,
|
|
selected_field: None,
|
|
}
|
|
}
|
|
}
|
|
|
|
unsafe impl Send for State {}
|
|
|
|
pub struct Cea608Overlay {
|
|
srcpad: gst::Pad,
|
|
sinkpad: gst::Pad,
|
|
state: Mutex<State>,
|
|
settings: Mutex<Settings>,
|
|
}
|
|
|
|
impl Cea608Overlay {
|
|
// FIXME: we want to render the text in the largest 32 x 15 characters
|
|
// that will fit the viewport. This is a truly terrible way to determine
|
|
// the appropriate font size, but we only need to run that on resolution
|
|
// changes, and the API that would allow us to precisely control the
|
|
// line height has not yet been exposed by the bindings:
|
|
//
|
|
// https://blogs.gnome.org/mclasen/2019/07/27/more-text-rendering-updates/
|
|
//
|
|
// TODO: switch to the API presented in this post once it's been exposed
|
|
fn recalculate_layout(
|
|
&self,
|
|
element: &super::Cea608Overlay,
|
|
state: &mut State,
|
|
) -> Result<gst::FlowSuccess, gst::FlowError> {
|
|
let video_info = state.video_info.as_ref().unwrap();
|
|
let fontmap = match pangocairo::FontMap::new() {
|
|
Some(fontmap) => Ok(fontmap),
|
|
None => {
|
|
gst::element_error!(
|
|
element,
|
|
gst::LibraryError::Failed,
|
|
["Failed to create pangocairo font map"]
|
|
);
|
|
Err(gst::FlowError::Error)
|
|
}
|
|
}?;
|
|
let context = match fontmap.create_context() {
|
|
Some(context) => Ok(context),
|
|
None => {
|
|
gst::element_error!(
|
|
element,
|
|
gst::LibraryError::Failed,
|
|
["Failed to create font map context"]
|
|
);
|
|
Err(gst::FlowError::Error)
|
|
}
|
|
}?;
|
|
context.set_language(&pango::Language::from_string("en_US"));
|
|
context.set_base_dir(pango::Direction::Ltr);
|
|
let layout = pango::Layout::new(&context);
|
|
layout.set_alignment(pango::Alignment::Left);
|
|
let mut font_desc = pango::FontDescription::from_string("monospace");
|
|
|
|
let mut font_size = 1;
|
|
let mut left_alignment = 0;
|
|
loop {
|
|
font_desc.set_size(font_size * pango::SCALE);
|
|
layout.set_font_description(Some(&font_desc));
|
|
layout.set_text(
|
|
"12345678901234567890123456789012\n2\n3\n4\n5\n6\n7\n8\n9\n0\n1\n2\n3\n4\n5",
|
|
);
|
|
let (_ink_rect, logical_rect) = layout.extents();
|
|
if logical_rect.width > video_info.width() as i32 * pango::SCALE
|
|
|| logical_rect.height > video_info.height() as i32 * pango::SCALE
|
|
{
|
|
font_desc.set_size((font_size - 1) * pango::SCALE);
|
|
layout.set_font_description(Some(&font_desc));
|
|
break;
|
|
}
|
|
left_alignment = (video_info.width() as i32 - logical_rect.width / pango::SCALE) / 2;
|
|
font_size += 1;
|
|
}
|
|
|
|
if self.settings.lock().unwrap().black_background {
|
|
let attrs = pango::AttrList::new();
|
|
let attr = pango::Attribute::new_background(0, 0, 0);
|
|
attrs.insert(attr);
|
|
layout.set_attributes(Some(&attrs));
|
|
}
|
|
|
|
state.left_alignment = left_alignment;
|
|
state.layout = Some(layout);
|
|
|
|
Ok(gst::FlowSuccess::Ok)
|
|
}
|
|
|
|
fn overlay_text(&self, element: &super::Cea608Overlay, text: &str, state: &mut State) {
|
|
let video_info = state.video_info.as_ref().unwrap();
|
|
let layout = state.layout.as_ref().unwrap();
|
|
layout.set_text(text);
|
|
let (_ink_rect, logical_rect) = layout.extents();
|
|
let height = logical_rect.height / pango::SCALE;
|
|
let width = logical_rect.width / pango::SCALE;
|
|
|
|
// No text actually needs rendering
|
|
if width == 0 || height == 0 {
|
|
state.composition = None;
|
|
return;
|
|
}
|
|
|
|
let render_buffer = || -> Option<gst::Buffer> {
|
|
let mut buffer = gst::Buffer::with_size((width * height) as usize * 4).ok()?;
|
|
|
|
gst_video::VideoMeta::add(
|
|
buffer.get_mut().unwrap(),
|
|
gst_video::VideoFrameFlags::empty(),
|
|
#[cfg(target_endian = "little")]
|
|
gst_video::VideoFormat::Bgra,
|
|
#[cfg(target_endian = "big")]
|
|
gst_video::VideoFormat::Argb,
|
|
width as u32,
|
|
height as u32,
|
|
)
|
|
.ok()?;
|
|
let buffer = buffer.into_mapped_buffer_writable().unwrap();
|
|
|
|
// Pass ownership of the buffer to the cairo surface but keep around
|
|
// a raw pointer so we can later retrieve it again when the surface
|
|
// is done
|
|
let buffer_ptr = unsafe { buffer.buffer().as_ptr() };
|
|
let surface = cairo::ImageSurface::create_for_data(
|
|
buffer,
|
|
cairo::Format::ARgb32,
|
|
width,
|
|
height,
|
|
width * 4,
|
|
)
|
|
.ok()?;
|
|
|
|
let cr = cairo::Context::new(&surface).ok()?;
|
|
|
|
// Clear background
|
|
cr.set_operator(cairo::Operator::Source);
|
|
cr.set_source_rgba(0.0, 0.0, 0.0, 0.0);
|
|
cr.paint().ok()?;
|
|
|
|
// Render text outline
|
|
cr.save().ok()?;
|
|
cr.set_operator(cairo::Operator::Over);
|
|
|
|
cr.set_source_rgba(0.0, 0.0, 0.0, 1.0);
|
|
|
|
pangocairo::functions::layout_path(&cr, layout);
|
|
cr.stroke().ok()?;
|
|
cr.restore().ok()?;
|
|
|
|
// Render text
|
|
cr.save().ok()?;
|
|
cr.set_source_rgba(255.0, 255.0, 255.0, 1.0);
|
|
|
|
pangocairo::functions::show_layout(&cr, layout);
|
|
|
|
cr.restore().ok()?;
|
|
drop(cr);
|
|
|
|
// Safety: The surface still owns a mutable reference to the buffer but our reference
|
|
// to the surface here is the last one. After dropping the surface the buffer would be
|
|
// freed, so we keep an additional strong reference here before dropping the surface,
|
|
// which is then returned. As such it's guaranteed that nothing is using the buffer
|
|
// anymore mutably.
|
|
unsafe {
|
|
assert_eq!(
|
|
cairo::ffi::cairo_surface_get_reference_count(surface.to_raw_none()),
|
|
1
|
|
);
|
|
let buffer = glib::translate::from_glib_none(buffer_ptr);
|
|
drop(surface);
|
|
buffer
|
|
}
|
|
};
|
|
|
|
let buffer = match render_buffer() {
|
|
Some(buffer) => buffer,
|
|
None => {
|
|
gst_error!(CAT, obj: element, "Failed to render buffer");
|
|
state.composition = None;
|
|
return;
|
|
}
|
|
};
|
|
|
|
let rect = gst_video::VideoOverlayRectangle::new_raw(
|
|
&buffer,
|
|
state.left_alignment,
|
|
(video_info.height() as i32 - height) / 2,
|
|
width as u32,
|
|
height as u32,
|
|
gst_video::VideoOverlayFormatFlags::PREMULTIPLIED_ALPHA,
|
|
);
|
|
|
|
state.composition = match gst_video::VideoOverlayComposition::new(Some(&rect)) {
|
|
Ok(composition) => Some(composition),
|
|
Err(_) => None,
|
|
};
|
|
}
|
|
|
|
fn negotiate(
|
|
&self,
|
|
element: &super::Cea608Overlay,
|
|
state: &mut State,
|
|
) -> Result<gst::FlowSuccess, gst::FlowError> {
|
|
let video_info = match state.video_info.as_ref() {
|
|
Some(video_info) => Ok(video_info),
|
|
None => {
|
|
gst::element_error!(
|
|
element,
|
|
gst::CoreError::Negotiation,
|
|
["Element hasn't received valid video caps at negotiation time"]
|
|
);
|
|
Err(gst::FlowError::NotNegotiated)
|
|
}
|
|
}?;
|
|
|
|
let mut caps = video_info.to_caps().unwrap();
|
|
let mut downstream_accepts_meta = false;
|
|
|
|
let upstream_has_meta = caps
|
|
.features(0)
|
|
.map(|f| f.contains(&gst_video::CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION))
|
|
.unwrap_or(false);
|
|
|
|
if !upstream_has_meta {
|
|
let mut caps_clone = caps.clone();
|
|
let overlay_caps = caps_clone.make_mut();
|
|
|
|
if let Some(features) = overlay_caps.features_mut(0) {
|
|
features.add(&gst_video::CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
|
|
let peercaps = self.srcpad.peer_query_caps(Some(&caps_clone));
|
|
downstream_accepts_meta = !peercaps.is_empty();
|
|
if downstream_accepts_meta {
|
|
caps = caps_clone;
|
|
}
|
|
}
|
|
}
|
|
|
|
state.attach = upstream_has_meta || downstream_accepts_meta;
|
|
|
|
let _ = state.layout.take();
|
|
|
|
if !self.srcpad.push_event(gst::event::Caps::new(&caps)) {
|
|
Err(gst::FlowError::NotNegotiated)
|
|
} else {
|
|
Ok(gst::FlowSuccess::Ok)
|
|
}
|
|
}
|
|
|
|
fn decode_cc_data(
|
|
&self,
|
|
pad: &gst::Pad,
|
|
element: &super::Cea608Overlay,
|
|
state: &mut State,
|
|
data: &[u8],
|
|
) {
|
|
if data.len() % 3 != 0 {
|
|
gst_warning!(CAT, "cc_data length is not a multiple of 3, truncating");
|
|
}
|
|
|
|
for triple in data.chunks_exact(3) {
|
|
let cc_valid = (triple[0] & 0x04) == 0x04;
|
|
let cc_type = triple[0] & 0x03;
|
|
|
|
if cc_valid {
|
|
if cc_type == 0x00 || cc_type == 0x01 {
|
|
if state.selected_field.is_none() {
|
|
state.selected_field = Some(cc_type);
|
|
gst_info!(
|
|
CAT,
|
|
obj: element,
|
|
"Selected field {} automatically",
|
|
cc_type
|
|
);
|
|
}
|
|
|
|
if Some(cc_type) == state.selected_field {
|
|
if let Ok(Status::Ready) = state
|
|
.caption_frame
|
|
.decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0)
|
|
{
|
|
let text = match state.caption_frame.to_text(true) {
|
|
Ok(text) => text,
|
|
Err(_) => {
|
|
gst_error!(
|
|
CAT,
|
|
obj: pad,
|
|
"Failed to convert caption frame to text"
|
|
);
|
|
continue;
|
|
}
|
|
};
|
|
|
|
self.overlay_text(element, &text, state);
|
|
}
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn decode_s334_1a(
|
|
&self,
|
|
pad: &gst::Pad,
|
|
element: &super::Cea608Overlay,
|
|
state: &mut State,
|
|
data: &[u8],
|
|
) {
|
|
if data.len() % 3 != 0 {
|
|
gst_warning!(CAT, "cc_data length is not a multiple of 3, truncating");
|
|
}
|
|
|
|
for triple in data.chunks_exact(3) {
|
|
let cc_type = triple[0] & 0x01;
|
|
if state.selected_field.is_none() {
|
|
state.selected_field = Some(cc_type);
|
|
gst_info!(
|
|
CAT,
|
|
obj: element,
|
|
"Selected field {} automatically",
|
|
cc_type
|
|
);
|
|
}
|
|
|
|
if Some(cc_type) == state.selected_field {
|
|
if let Ok(Status::Ready) = state
|
|
.caption_frame
|
|
.decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0)
|
|
{
|
|
let text = match state.caption_frame.to_text(true) {
|
|
Ok(text) => text,
|
|
Err(_) => {
|
|
gst_error!(CAT, obj: pad, "Failed to convert caption frame to text");
|
|
continue;
|
|
}
|
|
};
|
|
|
|
self.overlay_text(element, &text, state);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn sink_chain(
|
|
&self,
|
|
pad: &gst::Pad,
|
|
element: &super::Cea608Overlay,
|
|
mut buffer: gst::Buffer,
|
|
) -> Result<gst::FlowSuccess, gst::FlowError> {
|
|
gst_log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
|
|
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
if self.srcpad.check_reconfigure() {
|
|
self.negotiate(element, &mut state)?;
|
|
}
|
|
|
|
if state.layout.is_none() {
|
|
self.recalculate_layout(element, &mut state)?;
|
|
}
|
|
|
|
for meta in buffer.iter_meta::<gst_video::VideoCaptionMeta>() {
|
|
if meta.caption_type() == gst_video::VideoCaptionType::Cea708Cdp {
|
|
match extract_cdp(meta.data()) {
|
|
Ok(data) => {
|
|
self.decode_cc_data(pad, element, &mut state, data);
|
|
}
|
|
Err(e) => {
|
|
gst_warning!(CAT, "{}", &e.to_string());
|
|
gst::element_warning!(element, gst::StreamError::Decode, [&e.to_string()]);
|
|
}
|
|
}
|
|
} else if meta.caption_type() == gst_video::VideoCaptionType::Cea708Raw {
|
|
self.decode_cc_data(pad, element, &mut state, meta.data());
|
|
} else if meta.caption_type() == gst_video::VideoCaptionType::Cea608S3341a {
|
|
self.decode_s334_1a(pad, element, &mut state, meta.data());
|
|
} else if meta.caption_type() == gst_video::VideoCaptionType::Cea608Raw {
|
|
let data = meta.data();
|
|
assert!(data.len() % 2 == 0);
|
|
for i in 0..data.len() / 2 {
|
|
if let Ok(Status::Ready) = state
|
|
.caption_frame
|
|
.decode((data[i * 2] as u16) << 8 | data[i * 2 + 1] as u16, 0.0)
|
|
{
|
|
let text = match state.caption_frame.to_text(true) {
|
|
Ok(text) => text,
|
|
Err(_) => {
|
|
gst_error!(
|
|
CAT,
|
|
obj: pad,
|
|
"Failed to convert caption frame to text"
|
|
);
|
|
continue;
|
|
}
|
|
};
|
|
|
|
self.overlay_text(element, &text, &mut state);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if let Some(composition) = &state.composition {
|
|
let buffer = buffer.make_mut();
|
|
if state.attach {
|
|
gst_video::VideoOverlayCompositionMeta::add(buffer, composition);
|
|
} else {
|
|
let mut frame = gst_video::VideoFrameRef::from_buffer_ref_writable(
|
|
buffer,
|
|
state.video_info.as_ref().unwrap(),
|
|
)
|
|
.unwrap();
|
|
|
|
if composition.blend(&mut frame).is_err() {
|
|
gst_error!(CAT, obj: pad, "Failed to blend composition");
|
|
}
|
|
}
|
|
}
|
|
drop(state);
|
|
|
|
self.srcpad.push(buffer)
|
|
}
|
|
|
|
fn sink_event(
|
|
&self,
|
|
pad: &gst::Pad,
|
|
element: &super::Cea608Overlay,
|
|
event: gst::Event,
|
|
) -> bool {
|
|
use gst::EventView;
|
|
|
|
gst_log!(CAT, obj: pad, "Handling event {:?}", event);
|
|
match event.view() {
|
|
EventView::Caps(c) => {
|
|
let mut state = self.state.lock().unwrap();
|
|
state.video_info = gst_video::VideoInfo::from_caps(c.caps()).ok();
|
|
self.srcpad.check_reconfigure();
|
|
match self.negotiate(element, &mut state) {
|
|
Ok(_) => true,
|
|
Err(_) => {
|
|
self.srcpad.mark_reconfigure();
|
|
true
|
|
}
|
|
}
|
|
}
|
|
EventView::FlushStop(..) => {
|
|
let mut state = self.state.lock().unwrap();
|
|
state.caption_frame = CaptionFrame::default();
|
|
state.composition = None;
|
|
pad.event_default(Some(element), event)
|
|
}
|
|
_ => pad.event_default(Some(element), event),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[glib::object_subclass]
|
|
impl ObjectSubclass for Cea608Overlay {
|
|
const NAME: &'static str = "RsCea608Overlay";
|
|
type Type = super::Cea608Overlay;
|
|
type ParentType = gst::Element;
|
|
|
|
fn with_class(klass: &Self::Class) -> Self {
|
|
let templ = klass.pad_template("sink").unwrap();
|
|
let sinkpad = gst::Pad::builder_with_template(&templ, Some("sink"))
|
|
.chain_function(|pad, parent, buffer| {
|
|
Cea608Overlay::catch_panic_pad_function(
|
|
parent,
|
|
|| Err(gst::FlowError::Error),
|
|
|overlay, element| overlay.sink_chain(pad, element, buffer),
|
|
)
|
|
})
|
|
.event_function(|pad, parent, event| {
|
|
Cea608Overlay::catch_panic_pad_function(
|
|
parent,
|
|
|| false,
|
|
|overlay, element| overlay.sink_event(pad, element, event),
|
|
)
|
|
})
|
|
.flags(gst::PadFlags::PROXY_CAPS)
|
|
.flags(gst::PadFlags::PROXY_ALLOCATION)
|
|
.build();
|
|
|
|
let templ = klass.pad_template("src").unwrap();
|
|
let srcpad = gst::Pad::builder_with_template(&templ, Some("src"))
|
|
.flags(gst::PadFlags::PROXY_CAPS)
|
|
.flags(gst::PadFlags::PROXY_ALLOCATION)
|
|
.build();
|
|
|
|
Self {
|
|
srcpad,
|
|
sinkpad,
|
|
state: Mutex::new(State::default()),
|
|
settings: Mutex::new(Settings::default()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ObjectImpl for Cea608Overlay {
|
|
fn properties() -> &'static [glib::ParamSpec] {
|
|
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
|
|
vec![
|
|
glib::ParamSpec::new_int(
|
|
"field",
|
|
"Field",
|
|
"The field to render the caption for when available, (-1=automatic)",
|
|
-1,
|
|
1,
|
|
DEFAULT_FIELD,
|
|
glib::ParamFlags::READWRITE | gst::PARAM_FLAG_MUTABLE_PLAYING,
|
|
),
|
|
glib::ParamSpec::new_boolean(
|
|
"black-background",
|
|
"Black background",
|
|
"Whether a black background should be drawn behind text",
|
|
DEFAULT_BLACK_BACKGROUND,
|
|
glib::ParamFlags::READWRITE | gst::PARAM_FLAG_MUTABLE_PLAYING,
|
|
),
|
|
]
|
|
});
|
|
|
|
PROPERTIES.as_ref()
|
|
}
|
|
|
|
fn set_property(
|
|
&self,
|
|
_obj: &Self::Type,
|
|
_id: usize,
|
|
value: &glib::Value,
|
|
pspec: &glib::ParamSpec,
|
|
) {
|
|
match pspec.name() {
|
|
"field" => {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
settings.field = value.get().expect("type checked upstream");
|
|
state.selected_field = match settings.field {
|
|
-1 => None,
|
|
val => Some(val as u8),
|
|
};
|
|
}
|
|
"black-background" => {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
settings.black_background = value.get().expect("type checked upstream");
|
|
let _ = state.layout.take();
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
|
|
match pspec.name() {
|
|
"field" => {
|
|
let settings = self.settings.lock().unwrap();
|
|
settings.field.to_value()
|
|
}
|
|
"black-background" => {
|
|
let settings = self.settings.lock().unwrap();
|
|
settings.black_background.to_value()
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
fn constructed(&self, obj: &Self::Type) {
|
|
self.parent_constructed(obj);
|
|
|
|
obj.add_pad(&self.sinkpad).unwrap();
|
|
obj.add_pad(&self.srcpad).unwrap();
|
|
}
|
|
}
|
|
|
|
impl ElementImpl for Cea608Overlay {
|
|
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
|
|
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
|
|
gst::subclass::ElementMetadata::new(
|
|
"Cea 608 overlay",
|
|
"Video/Overlay/Subtitle",
|
|
"Renders CEA 608 closed caption meta over raw video frames",
|
|
"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_video::VideoFormat::iter_raw()
|
|
.into_video_caps()
|
|
.unwrap()
|
|
.build();
|
|
|
|
let sink_pad_template = gst::PadTemplate::new(
|
|
"sink",
|
|
gst::PadDirection::Sink,
|
|
gst::PadPresence::Always,
|
|
&caps,
|
|
)
|
|
.unwrap();
|
|
|
|
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()
|
|
}
|
|
|
|
fn change_state(
|
|
&self,
|
|
element: &Self::Type,
|
|
transition: gst::StateChange,
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
|
|
|
|
match transition {
|
|
gst::StateChange::ReadyToPaused | gst::StateChange::PausedToReady => {
|
|
// Reset the whole state
|
|
let mut state = self.state.lock().unwrap();
|
|
*state = State::default();
|
|
let settings = self.settings.lock().unwrap();
|
|
state.selected_field = match settings.field {
|
|
-1 => None,
|
|
val => Some(val as u8),
|
|
};
|
|
}
|
|
_ => (),
|
|
}
|
|
|
|
self.parent_change_state(element, transition)
|
|
}
|
|
}
|