mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-03 08:58:45 +00:00
721 lines
25 KiB
Rust
721 lines
25 KiB
Rust
// Copyright (C) 2020 Mathieu Duponchelle <mathieu@centricular.com>
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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 gst::glib;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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use gst_video::prelude::*;
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use once_cell::sync::Lazy;
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use std::sync::Mutex;
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use pango::prelude::*;
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use crate::caption_frame::{CaptionFrame, Status};
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use crate::ccutils::extract_cdp;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"cea608overlay",
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gst::DebugColorFlags::empty(),
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Some("CEA 608 overlay element"),
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)
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});
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const DEFAULT_FIELD: i32 = -1;
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const DEFAULT_BLACK_BACKGROUND: bool = false;
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#[derive(Debug)]
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struct Settings {
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field: i32,
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black_background: bool,
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timeout: Option<gst::ClockTime>,
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}
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impl Default for Settings {
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fn default() -> Self {
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Settings {
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field: DEFAULT_FIELD,
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black_background: DEFAULT_BLACK_BACKGROUND,
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timeout: gst::ClockTime::NONE,
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}
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}
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}
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struct State {
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video_info: Option<gst_video::VideoInfo>,
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layout: Option<pango::Layout>,
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caption_frame: CaptionFrame,
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composition: Option<gst_video::VideoOverlayComposition>,
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left_alignment: i32,
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attach: bool,
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selected_field: Option<u8>,
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last_cc_pts: Option<gst::ClockTime>,
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}
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// SAFETY: Required because `pango::Layout` is not `Send` but the whole `State` needs to be.
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// We ensure that no additional references to the layout are ever created, which makes it safe
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// to send it to other threads as long as only a single thread uses it concurrently.
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unsafe impl Send for State {}
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impl Default for State {
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fn default() -> Self {
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Self {
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video_info: None,
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layout: None,
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caption_frame: CaptionFrame::default(),
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composition: None,
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left_alignment: 0,
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attach: false,
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selected_field: None,
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last_cc_pts: gst::ClockTime::NONE,
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}
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}
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}
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pub struct Cea608Overlay {
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srcpad: gst::Pad,
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sinkpad: gst::Pad,
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state: Mutex<State>,
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settings: Mutex<Settings>,
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}
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impl Cea608Overlay {
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// FIXME: we want to render the text in the largest 32 x 15 characters
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// that will fit the viewport. This is a truly terrible way to determine
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// the appropriate font size, but we only need to run that on resolution
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// changes, and the API that would allow us to precisely control the
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// line height has not yet been exposed by the bindings:
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//
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// https://blogs.gnome.org/mclasen/2019/07/27/more-text-rendering-updates/
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//
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// TODO: switch to the API presented in this post once it's been exposed
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fn recalculate_layout(&self, state: &mut State) -> Result<gst::FlowSuccess, gst::FlowError> {
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let video_info = state.video_info.as_ref().unwrap();
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let fontmap = pangocairo::FontMap::new();
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let context = fontmap.create_context();
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context.set_language(Some(&pango::Language::from_string("en_US")));
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context.set_base_dir(pango::Direction::Ltr);
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let layout = pango::Layout::new(&context);
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layout.set_alignment(pango::Alignment::Left);
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let mut font_desc = pango::FontDescription::from_string("monospace");
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let mut font_size = 1;
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let mut left_alignment = 0;
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loop {
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font_desc.set_size(font_size * pango::SCALE);
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layout.set_font_description(Some(&font_desc));
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layout.set_text(
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"12345678901234567890123456789012\n2\n3\n4\n5\n6\n7\n8\n9\n0\n1\n2\n3\n4\n5",
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);
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let (_ink_rect, logical_rect) = layout.extents();
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if logical_rect.width() > video_info.width() as i32 * pango::SCALE
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|| logical_rect.height() > video_info.height() as i32 * pango::SCALE
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{
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font_desc.set_size((font_size - 1) * pango::SCALE);
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layout.set_font_description(Some(&font_desc));
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break;
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}
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left_alignment = (video_info.width() as i32 - logical_rect.width() / pango::SCALE) / 2;
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font_size += 1;
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}
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if self.settings.lock().unwrap().black_background {
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let attrs = pango::AttrList::new();
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let attr = pango::AttrColor::new_background(0, 0, 0);
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attrs.insert(attr);
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layout.set_attributes(Some(&attrs));
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}
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state.left_alignment = left_alignment;
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state.layout = Some(layout);
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Ok(gst::FlowSuccess::Ok)
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}
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fn overlay_text(&self, text: &str, state: &mut State) {
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let video_info = state.video_info.as_ref().unwrap();
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let layout = state.layout.as_ref().unwrap();
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layout.set_text(text);
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let (_ink_rect, logical_rect) = layout.extents();
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let height = logical_rect.height() / pango::SCALE;
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let width = logical_rect.width() / pango::SCALE;
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// No text actually needs rendering
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if width == 0 || height == 0 {
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state.composition = None;
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return;
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}
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let render_buffer = || -> Option<gst::Buffer> {
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let mut buffer = gst::Buffer::with_size((width * height) as usize * 4).ok()?;
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gst_video::VideoMeta::add(
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buffer.get_mut().unwrap(),
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gst_video::VideoFrameFlags::empty(),
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#[cfg(target_endian = "little")]
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gst_video::VideoFormat::Bgra,
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#[cfg(target_endian = "big")]
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gst_video::VideoFormat::Argb,
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width as u32,
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height as u32,
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)
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.ok()?;
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let buffer = buffer.into_mapped_buffer_writable().unwrap();
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// Pass ownership of the buffer to the cairo surface but keep around
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// a raw pointer so we can later retrieve it again when the surface
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// is done
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let buffer_ptr = buffer.buffer().as_ptr();
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let surface = cairo::ImageSurface::create_for_data(
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buffer,
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cairo::Format::ARgb32,
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width,
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height,
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width * 4,
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)
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.ok()?;
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let cr = cairo::Context::new(&surface).ok()?;
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// Clear background
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cr.set_operator(cairo::Operator::Source);
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cr.set_source_rgba(0.0, 0.0, 0.0, 0.0);
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cr.paint().ok()?;
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// Render text outline
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cr.save().ok()?;
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cr.set_operator(cairo::Operator::Over);
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cr.set_source_rgba(0.0, 0.0, 0.0, 1.0);
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pangocairo::functions::layout_path(&cr, layout);
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cr.stroke().ok()?;
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cr.restore().ok()?;
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// Render text
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cr.save().ok()?;
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cr.set_source_rgba(255.0, 255.0, 255.0, 1.0);
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pangocairo::functions::show_layout(&cr, layout);
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cr.restore().ok()?;
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drop(cr);
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// Safety: The surface still owns a mutable reference to the buffer but our reference
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// to the surface here is the last one. After dropping the surface the buffer would be
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// freed, so we keep an additional strong reference here before dropping the surface,
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// which is then returned. As such it's guaranteed that nothing is using the buffer
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// anymore mutably.
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unsafe {
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assert_eq!(
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cairo::ffi::cairo_surface_get_reference_count(surface.to_raw_none()),
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1
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);
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let buffer = glib::translate::from_glib_none(buffer_ptr);
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drop(surface);
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buffer
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}
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};
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let buffer = match render_buffer() {
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Some(buffer) => buffer,
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None => {
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gst::error!(CAT, imp: self, "Failed to render buffer");
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state.composition = None;
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return;
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}
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};
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let rect = gst_video::VideoOverlayRectangle::new_raw(
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&buffer,
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state.left_alignment,
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(video_info.height() as i32 - height) / 2,
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width as u32,
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height as u32,
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gst_video::VideoOverlayFormatFlags::PREMULTIPLIED_ALPHA,
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);
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state.composition = match gst_video::VideoOverlayComposition::new(Some(&rect)) {
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Ok(composition) => Some(composition),
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Err(_) => None,
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};
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}
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fn negotiate(&self, state: &mut State) -> Result<gst::FlowSuccess, gst::FlowError> {
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let video_info = match state.video_info.as_ref() {
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Some(video_info) => Ok(video_info),
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None => {
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gst::element_imp_error!(
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self,
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gst::CoreError::Negotiation,
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["Element hasn't received valid video caps at negotiation time"]
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);
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Err(gst::FlowError::NotNegotiated)
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}
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}?;
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let mut caps = video_info.to_caps().unwrap();
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let mut downstream_accepts_meta = false;
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let upstream_has_meta = caps
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.features(0)
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.map(|f| f.contains(&gst_video::CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION))
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.unwrap_or(false);
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if !upstream_has_meta {
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let mut caps_clone = caps.clone();
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let overlay_caps = caps_clone.make_mut();
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if let Some(features) = overlay_caps.features_mut(0) {
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features.add(&gst_video::CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
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let peercaps = self.srcpad.peer_query_caps(Some(&caps_clone));
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downstream_accepts_meta = !peercaps.is_empty();
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if downstream_accepts_meta {
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caps = caps_clone;
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}
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}
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}
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state.attach = upstream_has_meta || downstream_accepts_meta;
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let _ = state.layout.take();
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if !self.srcpad.push_event(gst::event::Caps::new(&caps)) {
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Err(gst::FlowError::NotNegotiated)
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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 decode_cc_data(&self, pad: &gst::Pad, state: &mut State, data: &[u8], pts: gst::ClockTime) {
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if data.len() % 3 != 0 {
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gst::warning!(CAT, "cc_data length is not a multiple of 3, truncating");
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}
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for triple in data.chunks_exact(3) {
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let cc_valid = (triple[0] & 0x04) == 0x04;
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let cc_type = triple[0] & 0x03;
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if cc_valid {
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if cc_type == 0x00 || cc_type == 0x01 {
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if state.selected_field.is_none() {
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state.selected_field = Some(cc_type);
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gst::info!(CAT, imp: self, "Selected field {} automatically", cc_type);
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}
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if Some(cc_type) == state.selected_field {
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match state
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.caption_frame
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.decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0)
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{
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Ok(Status::Ready) => {
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let text = match state.caption_frame.to_text(true) {
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Ok(text) => text,
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Err(_) => {
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gst::error!(
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CAT,
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obj: pad,
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"Failed to convert caption frame to text"
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);
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continue;
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}
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};
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self.overlay_text(&text, state);
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}
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Ok(Status::Clear) => {
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self.overlay_text("", state);
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}
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Ok(Status::Ok) => (),
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Err(err) => {
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gst::error!(
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CAT,
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obj: pad,
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"Failed to decode caption frame: {:?}",
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err
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);
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}
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}
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self.reset_timeout(state, pts);
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}
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} else {
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break;
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}
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}
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}
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}
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fn decode_s334_1a(&self, pad: &gst::Pad, state: &mut State, data: &[u8], pts: gst::ClockTime) {
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if data.len() % 3 != 0 {
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gst::warning!(CAT, "cc_data length is not a multiple of 3, truncating");
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}
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for triple in data.chunks_exact(3) {
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let cc_type = triple[0] & 0x01;
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if state.selected_field.is_none() {
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state.selected_field = Some(cc_type);
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gst::info!(CAT, imp: self, "Selected field {} automatically", cc_type);
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}
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if Some(cc_type) == state.selected_field {
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if let Ok(Status::Ready) = state
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.caption_frame
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.decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0)
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{
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let text = match state.caption_frame.to_text(true) {
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Ok(text) => text,
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Err(_) => {
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gst::error!(CAT, obj: pad, "Failed to convert caption frame to text");
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continue;
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}
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};
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self.overlay_text(&text, state);
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}
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self.reset_timeout(state, pts);
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}
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}
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}
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fn reset_timeout(&self, state: &mut State, pts: gst::ClockTime) {
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state.last_cc_pts = Some(pts);
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}
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fn sink_chain(
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&self,
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pad: &gst::Pad,
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mut buffer: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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gst::log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
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let pts = buffer.pts().ok_or_else(|| {
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gst::error!(CAT, obj: pad, "Require timestamped buffers");
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gst::FlowError::Error
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})?;
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let mut state = self.state.lock().unwrap();
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if self.srcpad.check_reconfigure() {
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self.negotiate(&mut state)?;
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}
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if state.layout.is_none() {
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self.recalculate_layout(&mut state)?;
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}
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for meta in buffer.iter_meta::<gst_video::VideoCaptionMeta>() {
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if meta.caption_type() == gst_video::VideoCaptionType::Cea708Cdp {
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match extract_cdp(meta.data()) {
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Ok(data) => {
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self.decode_cc_data(pad, &mut state, data, pts);
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}
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Err(e) => {
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gst::warning!(CAT, "{}", &e.to_string());
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gst::element_imp_warning!(self, gst::StreamError::Decode, [&e.to_string()]);
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}
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}
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} else if meta.caption_type() == gst_video::VideoCaptionType::Cea708Raw {
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self.decode_cc_data(pad, &mut state, meta.data(), pts);
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} else if meta.caption_type() == gst_video::VideoCaptionType::Cea608S3341a {
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self.decode_s334_1a(pad, &mut state, meta.data(), pts);
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} else if meta.caption_type() == gst_video::VideoCaptionType::Cea608Raw {
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let data = meta.data();
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assert!(data.len() % 2 == 0);
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for i in 0..data.len() / 2 {
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if let Ok(Status::Ready) = state
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.caption_frame
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.decode((data[i * 2] as u16) << 8 | data[i * 2 + 1] as u16, 0.0)
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{
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let text = match state.caption_frame.to_text(true) {
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Ok(text) => text,
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Err(_) => {
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gst::error!(
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CAT,
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obj: pad,
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"Failed to convert caption frame to text"
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);
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continue;
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}
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};
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self.overlay_text(&text, &mut state);
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}
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self.reset_timeout(&mut state, pts);
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}
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}
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}
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if let Some(timeout) = self.settings.lock().unwrap().timeout {
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if let Some(interval) = pts.opt_saturating_sub(state.last_cc_pts) {
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if interval > timeout {
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gst::info!(CAT, imp: self, "Reached timeout, clearing overlay");
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state.composition.take();
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state.last_cc_pts.take();
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}
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}
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}
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if let Some(composition) = &state.composition {
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let buffer = buffer.make_mut();
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if state.attach {
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gst_video::VideoOverlayCompositionMeta::add(buffer, composition);
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} else {
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let mut frame = gst_video::VideoFrameRef::from_buffer_ref_writable(
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buffer,
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state.video_info.as_ref().unwrap(),
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)
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.unwrap();
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if composition.blend(&mut frame).is_err() {
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gst::error!(CAT, obj: pad, "Failed to blend composition");
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}
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}
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}
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drop(state);
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self.srcpad.push(buffer)
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}
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fn sink_event(&self, pad: &gst::Pad, 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(c) => {
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let mut state = self.state.lock().unwrap();
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state.video_info = gst_video::VideoInfo::from_caps(c.caps()).ok();
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self.srcpad.check_reconfigure();
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match self.negotiate(&mut state) {
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Ok(_) => true,
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Err(_) => {
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self.srcpad.mark_reconfigure();
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true
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}
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}
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}
|
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EventView::FlushStop(..) => {
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let mut state = self.state.lock().unwrap();
|
|
state.caption_frame = CaptionFrame::default();
|
|
state.composition = None;
|
|
gst::Pad::event_default(pad, Some(&*self.instance()), event)
|
|
}
|
|
_ => gst::Pad::event_default(pad, Some(&*self.instance()), event),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[glib::object_subclass]
|
|
impl ObjectSubclass for Cea608Overlay {
|
|
const NAME: &'static str = "GstCea608Overlay";
|
|
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| overlay.sink_chain(pad, buffer),
|
|
)
|
|
})
|
|
.event_function(|pad, parent, event| {
|
|
Cea608Overlay::catch_panic_pad_function(
|
|
parent,
|
|
|| false,
|
|
|overlay| overlay.sink_event(pad, 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::ParamSpecInt::builder("field")
|
|
.nick("Field")
|
|
.blurb("The field to render the caption for when available, (-1=automatic)")
|
|
.minimum(-1)
|
|
.maximum(1)
|
|
.default_value(DEFAULT_FIELD)
|
|
.mutable_playing()
|
|
.build(),
|
|
glib::ParamSpecBoolean::builder("black-background")
|
|
.nick("Black background")
|
|
.blurb("Whether a black background should be drawn behind text")
|
|
.default_value(DEFAULT_BLACK_BACKGROUND)
|
|
.mutable_playing()
|
|
.build(),
|
|
glib::ParamSpecUInt64::builder("timeout")
|
|
.nick("Timeout")
|
|
.blurb("Duration after which to erase overlay when no cc data has arrived for the selected field")
|
|
.minimum(16.seconds().nseconds())
|
|
.default_value(u64::MAX)
|
|
.mutable_playing()
|
|
.build(),
|
|
]
|
|
});
|
|
|
|
PROPERTIES.as_ref()
|
|
}
|
|
|
|
fn set_property(&self, _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();
|
|
}
|
|
"timeout" => {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
|
|
let timeout = value.get().expect("type checked upstream");
|
|
|
|
settings.timeout = match timeout {
|
|
u64::MAX => gst::ClockTime::NONE,
|
|
_ => Some(timeout.nseconds()),
|
|
};
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn property(&self, _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()
|
|
}
|
|
"timeout" => {
|
|
let settings = self.settings.lock().unwrap();
|
|
if let Some(timeout) = settings.timeout {
|
|
timeout.nseconds().to_value()
|
|
} else {
|
|
u64::MAX.to_value()
|
|
}
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
fn constructed(&self) {
|
|
self.parent_constructed();
|
|
|
|
let obj = self.instance();
|
|
obj.add_pad(&self.sinkpad).unwrap();
|
|
obj.add_pad(&self.srcpad).unwrap();
|
|
}
|
|
}
|
|
|
|
impl GstObjectImpl for Cea608Overlay {}
|
|
|
|
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,
|
|
transition: gst::StateChange,
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
gst::trace!(CAT, imp: self, "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(transition)
|
|
}
|
|
}
|