mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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42b4defb5c
Up to now, tttocea608 supported text/utf8, and no interface to control the positioning of closed captions apart from new lines in the input text. CEA 608 supports a larger set of features than that, such as positioning CC precisely in its 32 x 15 grid, styling text, switching from one mode to another, resetting the base row in roll-up mode etc .. A custom, JSON-based format is now supported by the element (caps application/x-json, format=cea608), allowing users to control those features in a pretty advanced manner. A side effect of this is that the approach previously used by the element to ensure frame-accurate CC display is now untenable: where we knew before that an input buffer would at most span 74 buffers and calculate a somewhat reasonable latency based on that, this is no longer possible. Instead we pick the approach most CC encoders seem to pick, and accept a certain latency at display time: for example the flipping of the back buffer to the display buffer for a 10-character text buffer will occur 7 frames after its PTS. This has obvious benefits in terms of code complexity and should generally be acceptable. + Removes a now irrelevant test, updates other tests + Extracts the Mode enum to the root of the crate, it will be used by another element in a follow-up commit
74 lines
2.1 KiB
Rust
74 lines
2.1 KiB
Rust
// Copyright (C) 2018 Sebastian Dröge <sebastian@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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#![recursion_limit = "128"]
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use serde::{Deserialize, Serialize};
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#[derive(
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Serialize, Deserialize, Debug, Eq, PartialEq, Ord, PartialOrd, Hash, Clone, Copy, glib::GEnum,
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)]
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#[repr(u32)]
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#[genum(type_name = "GstTtToCea608Mode")]
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enum Cea608Mode {
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PopOn,
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RollUp2,
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RollUp3,
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RollUp4,
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}
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#[allow(non_camel_case_types, non_upper_case_globals, unused)]
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#[allow(clippy::redundant_static_lifetimes, clippy::unreadable_literal)]
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#[allow(clippy::useless_transmute, clippy::trivially_copy_pass_by_ref)]
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mod ffi;
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mod caption_frame;
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mod ccdetect;
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mod cea608overlay;
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mod cea608tott;
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mod line_reader;
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mod mcc_enc;
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mod mcc_parse;
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mod parser_utils;
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mod scc_enc;
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mod scc_parse;
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mod tttocea608;
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fn plugin_init(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
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mcc_parse::register(plugin)?;
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mcc_enc::register(plugin)?;
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scc_parse::register(plugin)?;
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scc_enc::register(plugin)?;
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cea608tott::register(plugin)?;
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tttocea608::register(plugin)?;
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cea608overlay::register(plugin)?;
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ccdetect::register(plugin)?;
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Ok(())
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}
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gst::plugin_define!(
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rsclosedcaption,
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env!("CARGO_PKG_DESCRIPTION"),
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plugin_init,
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concat!(env!("CARGO_PKG_VERSION"), "-", env!("COMMIT_ID")),
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"LGPL",
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env!("CARGO_PKG_NAME"),
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env!("CARGO_PKG_NAME"),
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env!("CARGO_PKG_REPOSITORY"),
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env!("BUILD_REL_DATE")
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);
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