mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-04 09:28:44 +00:00
434 lines
13 KiB
Rust
434 lines
13 KiB
Rust
// Copyright (C) 2020 Matthew Waters <matthew@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_base::subclass::prelude::*;
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use crate::ccutils::{extract_cdp, ParseError, ParseErrorCode};
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use once_cell::sync::Lazy;
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use std::sync::Mutex;
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use std::u64;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"ccdetect",
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gst::DebugColorFlags::empty(),
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Some("Closed Caption Detection"),
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)
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});
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const DEFAULT_WINDOW: gst::ClockTime = gst::ClockTime::from_seconds(10);
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const DEFAULT_CC608: bool = false;
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const DEFAULT_CC708: bool = false;
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#[derive(Debug, Clone, Copy)]
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struct Settings {
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pub window: gst::ClockTime,
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pub cc608: bool,
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pub cc708: bool,
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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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window: DEFAULT_WINDOW,
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cc608: DEFAULT_CC608,
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cc708: DEFAULT_CC708,
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}
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}
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}
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#[derive(Debug, Clone, Copy)]
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enum CCFormat {
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Cc708Cdp,
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Cc708CcData,
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}
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#[derive(Debug, Clone, Copy)]
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struct State {
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format: CCFormat,
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last_cc608_change: Option<gst::ClockTime>,
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last_cc708_change: Option<gst::ClockTime>,
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}
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#[derive(Default)]
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pub struct CCDetect {
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settings: Mutex<Settings>,
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state: Mutex<Option<State>>,
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}
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#[derive(Debug, Clone, Copy)]
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struct CCPacketContents {
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cc608: bool,
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cc708: bool,
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}
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impl CCDetect {
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fn detect_cc_data(&self, data: &[u8]) -> Result<CCPacketContents, ParseError> {
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if data.len() % 3 != 0 {
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gst::warning!(
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CAT,
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imp: self,
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"cc_data length is not a multiple of 3, truncating"
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);
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}
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/* logic from ccconverter */
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let mut started_ccp = false;
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let mut have_cc608 = false;
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let mut have_cc708 = false;
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for (i, triple) in data.chunks_exact(3).enumerate() {
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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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gst::trace!(
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CAT,
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imp: self,
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"triple:{} have ccp:{} 608:{} 708:{} data:{:02x},{:02x},{:02x} cc_valid:{} cc_type:{:02b}",
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i * 3,
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started_ccp,
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have_cc608,
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have_cc708,
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triple[0],
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triple[1],
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triple[2],
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cc_valid,
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cc_type
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);
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if !started_ccp && cc_valid && (cc_type == 0x00 || cc_type == 0x01) {
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if triple[1] != 0x80 || triple[2] != 0x80 {
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have_cc608 = true;
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}
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continue;
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}
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if cc_type & 0b10 == 0b10 {
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started_ccp = true;
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}
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if !cc_valid {
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continue;
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}
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if cc_type == 0x00 || cc_type == 0x01 {
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return Err(ParseError {
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code: ParseErrorCode::WrongLayout,
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byte: data.len() - i * 3,
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msg: String::from("Invalid cc_data. cea608 bytes after cea708"),
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});
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}
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have_cc708 = true;
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}
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Ok(CCPacketContents {
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cc608: have_cc608,
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cc708: have_cc708,
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})
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}
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fn detect_cdp(&self, data: &[u8]) -> Result<CCPacketContents, ParseError> {
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let data = extract_cdp(data)?;
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self.detect_cc_data(data)
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}
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fn detect(&self, format: CCFormat, data: &[u8]) -> Result<CCPacketContents, ParseError> {
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match format {
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CCFormat::Cc708CcData => self.detect_cc_data(data),
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CCFormat::Cc708Cdp => self.detect_cdp(data),
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}
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}
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fn maybe_update_properties(
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&self,
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ts: gst::ClockTime,
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cc_packet: CCPacketContents,
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) -> Result<(), gst::FlowError> {
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let mut notify_cc608 = false;
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let mut notify_cc708 = false;
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{
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let mut settings = self.settings.lock().unwrap();
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let mut state_guard = self.state.lock().unwrap();
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let state = state_guard.as_mut().ok_or(gst::FlowError::NotNegotiated)?;
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gst::trace!(
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CAT,
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imp: self,
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"packet contains {:?} current settings {:?} and state {:?}",
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cc_packet,
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settings,
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state
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);
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if cc_packet.cc608 != settings.cc608 {
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let changed = state.last_cc608_change.map_or(true, |last_cc608_change| {
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ts > last_cc608_change + settings.window
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});
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if changed {
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settings.cc608 = cc_packet.cc608;
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state.last_cc608_change = Some(ts);
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notify_cc608 = true;
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}
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} else {
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state.last_cc608_change = Some(ts);
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}
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if cc_packet.cc708 != settings.cc708 {
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let changed = state.last_cc708_change.map_or(true, |last_cc708_change| {
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ts > last_cc708_change + settings.window
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});
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if changed {
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settings.cc708 = cc_packet.cc708;
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state.last_cc708_change = Some(ts);
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notify_cc708 = true;
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}
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} else {
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state.last_cc708_change = Some(ts);
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}
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gst::trace!(
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CAT,
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imp: self,
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"changed to settings {:?} state {:?}",
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settings,
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state
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);
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}
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if notify_cc608 {
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self.instance().notify("cc608");
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}
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if notify_cc708 {
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self.instance().notify("cc708");
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}
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Ok(())
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}
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}
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#[glib::object_subclass]
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impl ObjectSubclass for CCDetect {
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const NAME: &'static str = "GstCCDetect";
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type Type = super::CCDetect;
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type ParentType = gst_base::BaseTransform;
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}
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impl ObjectImpl for CCDetect {
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fn properties() -> &'static [glib::ParamSpec] {
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static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
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vec![
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glib::ParamSpecUInt64::builder("window")
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.nick("Window")
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.blurb("Window of time (in ns) to determine if captions exist in the stream")
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.maximum(u64::MAX - 1)
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.default_value(DEFAULT_WINDOW.nseconds())
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.mutable_playing()
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.build(),
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glib::ParamSpecBoolean::builder("cc608")
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.nick("cc608")
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.blurb("Whether CEA608 captions (CC1/CC3) have been detected")
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.default_value(DEFAULT_CC608)
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.read_only()
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.build(),
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glib::ParamSpecBoolean::builder("cc708")
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.nick("cc608")
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.blurb("Whether CEA708 captions (cc_data) have been detected")
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.default_value(DEFAULT_CC708)
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.read_only()
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.build(),
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]
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});
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PROPERTIES.as_ref()
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}
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fn set_property(&self, _id: usize, value: &glib::Value, pspec: &glib::ParamSpec) {
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match pspec.name() {
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"window" => {
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let mut settings = self.settings.lock().unwrap();
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settings.window = value.get::<u64>().unwrap().nseconds();
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}
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_ => unimplemented!(),
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}
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}
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fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
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match pspec.name() {
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"window" => {
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let settings = self.settings.lock().unwrap();
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settings.window.nseconds().to_value()
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}
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"cc608" => {
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let settings = self.settings.lock().unwrap();
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settings.cc608.to_value()
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}
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"cc708" => {
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let settings = self.settings.lock().unwrap();
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settings.cc708.to_value()
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}
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_ => unimplemented!(),
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}
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}
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}
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impl GstObjectImpl for CCDetect {}
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impl ElementImpl for CCDetect {
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fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
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static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
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gst::subclass::ElementMetadata::new(
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"Closed Caption Detect",
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"Filter/Video/ClosedCaption/Detect",
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"Detect if valid closed captions are present in a stream",
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"Matthew Waters <matthew@centricular.com>",
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)
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});
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Some(&*ELEMENT_METADATA)
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}
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fn pad_templates() -> &'static [gst::PadTemplate] {
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static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
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let mut caps = gst::Caps::new_empty();
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{
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let caps = caps.get_mut().unwrap();
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let s = gst::Structure::builder("closedcaption/x-cea-708")
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.field("format", gst::List::new(["cc_data", "cdp"]))
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.build();
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caps.append_structure(s);
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}
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let src_pad_template = gst::PadTemplate::new(
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"src",
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gst::PadDirection::Src,
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gst::PadPresence::Always,
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&caps,
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)
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.unwrap();
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let sink_pad_template = gst::PadTemplate::new(
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"sink",
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gst::PadDirection::Sink,
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gst::PadPresence::Always,
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&caps,
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)
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.unwrap();
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vec![src_pad_template, sink_pad_template]
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});
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PAD_TEMPLATES.as_ref()
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}
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}
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impl BaseTransformImpl for CCDetect {
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const MODE: gst_base::subclass::BaseTransformMode =
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gst_base::subclass::BaseTransformMode::AlwaysInPlace;
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const TRANSFORM_IP_ON_PASSTHROUGH: bool = true;
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const PASSTHROUGH_ON_SAME_CAPS: bool = true;
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fn transform_ip_passthrough(
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&self,
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buf: &gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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let map = buf.map_readable().map_err(|_| gst::FlowError::Error)?;
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let pts = buf.pts().ok_or_else(|| {
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gst::element_imp_error!(
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self,
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gst::ResourceError::Read,
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["Input buffers must have valid timestamps"]
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);
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gst::FlowError::Error
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})?;
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let format = {
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let mut state_guard = self.state.lock().unwrap();
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let state = state_guard.as_mut().ok_or(gst::FlowError::NotNegotiated)?;
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state.format
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};
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let cc_packet = match self.detect(format, map.as_slice()) {
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Ok(v) => v,
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Err(e) => {
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gst::warning!(CAT, imp: self, "{}", &e.to_string());
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gst::element_imp_warning!(self, gst::StreamError::Decode, [&e.to_string()]);
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CCPacketContents {
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cc608: false,
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cc708: false,
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}
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}
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};
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self.maybe_update_properties(pts, cc_packet)
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.map_err(|_| gst::FlowError::Error)?;
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Ok(gst::FlowSuccess::Ok)
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}
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fn sink_event(&self, event: gst::Event) -> bool {
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match event.view() {
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gst::event::EventView::Gap(gap) => {
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let _ = self.maybe_update_properties(
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gap.get().0,
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CCPacketContents {
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cc608: false,
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cc708: false,
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},
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);
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self.parent_sink_event(event)
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}
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_ => self.parent_sink_event(event),
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}
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}
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fn set_caps(&self, incaps: &gst::Caps, outcaps: &gst::Caps) -> Result<(), gst::LoggableError> {
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if incaps != outcaps {
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return Err(gst::loggable_error!(
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CAT,
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"Input and output caps are not the same"
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));
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}
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let s = incaps
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.structure(0)
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.ok_or_else(|| gst::loggable_error!(CAT, "Failed to parse input caps"))?;
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let format_str = s
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.get::<Option<&str>>("format")
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.map_err(|_| gst::loggable_error!(CAT, "Failed to parse input caps"))?
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.ok_or_else(|| gst::loggable_error!(CAT, "Failed to parse input caps"))?;
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let cc_format = match format_str {
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"cdp" => CCFormat::Cc708Cdp,
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"cc_data" => CCFormat::Cc708CcData,
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_ => return Err(gst::loggable_error!(CAT, "Failed to parse input caps")),
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};
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*self.state.lock().unwrap() = Some(State {
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format: cc_format,
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last_cc608_change: gst::ClockTime::NONE,
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last_cc708_change: gst::ClockTime::NONE,
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});
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Ok(())
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}
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fn stop(&self) -> Result<(), gst::ErrorMessage> {
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// Drop state
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let _ = self.state.lock().unwrap().take();
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Ok(())
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}
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}
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