diff options
author | Mathieu Duponchelle <mathieu@centricular.com> | 2021-02-12 04:08:07 +0300 |
---|---|---|
committer | GStreamer Merge Bot <gitlab-merge-bot@gstreamer-foundation.org> | 2021-02-15 22:25:18 +0300 |
commit | cc402f769cf45f8ac46706452cd367b24342e6df (patch) | |
tree | 8fa9c1014c1e15b642f8a0d9513dea35a26459aa | |
parent | 3c982a3de0bd350e586f87b8e50567552dd868f1 (diff) |
cea608overlay: support all VideoCaptionType meta
Also expose a field property, to allow selecting CC for a
specific field when the information is available. Defaults
to automatically picking the first field encountered.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/474>
-rw-r--r-- | video/closedcaption/src/cea608overlay/imp.rs | 196 |
1 files changed, 194 insertions, 2 deletions
diff --git a/video/closedcaption/src/cea608overlay/imp.rs b/video/closedcaption/src/cea608overlay/imp.rs index 8ca473e9c..4e6d153da 100644 --- a/video/closedcaption/src/cea608overlay/imp.rs +++ b/video/closedcaption/src/cea608overlay/imp.rs @@ -19,7 +19,7 @@ use glib::subclass; use glib::subclass::prelude::*; use gst::prelude::*; use gst::subclass::prelude::*; -use gst::{gst_error, gst_log, gst_trace}; +use gst::{gst_error, gst_info, gst_log, gst_trace, gst_warning}; use gst_video::prelude::*; use once_cell::sync::Lazy; @@ -29,6 +29,7 @@ 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( @@ -38,6 +39,21 @@ static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| { ) }); +const DEFAULT_FIELD: i32 = -1; + +#[derive(Debug)] +struct Settings { + field: i32, +} + +impl Default for Settings { + fn default() -> Self { + Settings { + field: DEFAULT_FIELD, + } + } +} + struct State { video_info: Option<gst_video::VideoInfo>, layout: Option<pango::Layout>, @@ -45,6 +61,7 @@ struct State { composition: Option<gst_video::VideoOverlayComposition>, left_alignment: i32, attach: bool, + selected_field: Option<u8>, } impl Default for State { @@ -56,6 +73,7 @@ impl Default for State { composition: None, left_alignment: 0, attach: false, + selected_field: None, } } } @@ -66,6 +84,7 @@ pub struct Cea608Overlay { srcpad: gst::Pad, sinkpad: gst::Pad, state: Mutex<State>, + settings: Mutex<Settings>, } impl Cea608Overlay { @@ -297,6 +316,112 @@ impl Cea608Overlay { } } + 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 { + match state + .caption_frame + .decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0) + { + Ok(Status::Ready) => { + 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 { + match state + .caption_frame + .decode((triple[1] as u16) << 8 | triple[2] as u16, 0.0) + { + Ok(Status::Ready) => { + 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, @@ -312,7 +437,21 @@ impl Cea608Overlay { } for meta in buffer.iter_meta::<gst_video::VideoCaptionMeta>() { - if meta.get_caption_type() == gst_video::VideoCaptionType::Cea608Raw { + if meta.get_caption_type() == gst_video::VideoCaptionType::Cea708Cdp { + match extract_cdp(meta.get_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.get_caption_type() == gst_video::VideoCaptionType::Cea708Raw { + self.decode_cc_data(pad, element, &mut state, meta.get_data()); + } else if meta.get_caption_type() == gst_video::VideoCaptionType::Cea608S3341a { + self.decode_s334_1a(pad, element, &mut state, meta.get_data()); + } else if meta.get_caption_type() == gst_video::VideoCaptionType::Cea608Raw { let data = meta.get_data(); assert!(data.len() % 2 == 0); for i in 0..data.len() / 2 { @@ -436,11 +575,59 @@ impl ObjectSubclass for Cea608Overlay { 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::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, + )] + }); + + PROPERTIES.as_ref() + } + + fn set_property( + &self, + _obj: &Self::Type, + _id: usize, + value: &glib::Value, + pspec: &glib::ParamSpec, + ) { + match pspec.get_name() { + "field" => { + let mut settings = self.settings.lock().unwrap(); + let mut state = self.state.lock().unwrap(); + + settings.field = value.get_some().expect("type checked upstream"); + state.selected_field = match settings.field { + -1 => None, + val => Some(val as u8), + }; + } + _ => unimplemented!(), + } + } + + fn get_property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value { + match pspec.get_name() { + "field" => { + let settings = self.settings.lock().unwrap(); + settings.field.to_value() + } + _ => unimplemented!(), + } + } fn constructed(&self, obj: &Self::Type) { self.parent_constructed(obj); @@ -504,6 +691,11 @@ impl ElementImpl for Cea608Overlay { // 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), + }; } _ => (), } |