2018-12-28 22:00:28 +00:00
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// 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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use glib;
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use glib::prelude::*;
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use glib::subclass;
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use glib::subclass::prelude::*;
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use gst;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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2019-01-21 19:45:00 +00:00
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use gst_video::{self, ValidVideoTimeCode};
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2018-12-28 22:00:28 +00:00
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2019-01-21 19:45:00 +00:00
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use std::sync::{Mutex, MutexGuard};
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2018-12-28 22:00:28 +00:00
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use crate::line_reader::LineReader;
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2019-01-21 19:45:00 +00:00
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use crate::mcc_parser::{MccLine, MccParser, TimeCode};
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lazy_static! {
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static ref CAT: gst::DebugCategory = {
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gst::DebugCategory::new(
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"mccparse",
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gst::DebugColorFlags::empty(),
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"Mcc Parser Element",
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)
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};
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}
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2018-12-28 22:00:28 +00:00
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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enum Format {
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Cea708Cdp,
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Cea608,
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}
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#[derive(Debug)]
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struct State {
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reader: LineReader<gst::MappedBuffer<gst::buffer::Readable>>,
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parser: MccParser,
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format: Option<Format>,
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need_segment: bool,
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pending_events: Vec<gst::Event>,
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start_position: gst::ClockTime,
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last_position: gst::ClockTime,
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last_timecode: Option<gst_video::ValidVideoTimeCode>,
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timecode_rate: Option<(u8, bool)>,
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}
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impl Default for State {
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fn default() -> Self {
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Self {
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reader: LineReader::new(),
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parser: MccParser::new(),
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format: None,
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need_segment: true,
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pending_events: Vec::new(),
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start_position: gst::CLOCK_TIME_NONE,
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last_position: gst::CLOCK_TIME_NONE,
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last_timecode: None,
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timecode_rate: None,
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}
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}
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}
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impl State {
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fn get_line(
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&mut self,
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drain: bool,
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) -> Result<
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Option<MccLine>,
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(
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&[u8],
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combine::easy::Errors<u8, &[u8], combine::stream::PointerOffset>,
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),
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> {
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let line = match self.reader.get_line_with_drain(drain) {
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None => {
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return Ok(None);
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}
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Some(line) => line,
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};
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self.parser
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.parse_line(line)
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.map(Option::Some)
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.map_err(|err| (line, err))
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}
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2019-01-21 19:45:00 +00:00
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fn handle_timecode(
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&mut self,
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element: &gst::Element,
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tc: TimeCode,
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framerate: gst::Fraction,
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drop_frame: bool,
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) -> Result<ValidVideoTimeCode, gst::FlowError> {
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let timecode = gst_video::VideoTimeCode::new(
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framerate,
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None,
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if drop_frame {
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gst_video::VideoTimeCodeFlags::DROP_FRAME
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} else {
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gst_video::VideoTimeCodeFlags::empty()
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},
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tc.hours,
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tc.minutes,
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tc.seconds,
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tc.frames,
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0,
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);
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match timecode.try_into() {
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Ok(timecode) => Ok(timecode),
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Err(timecode) => {
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let last_timecode =
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self.last_timecode
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.as_ref()
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.map(Clone::clone)
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.ok_or_else(|| {
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gst_element_error!(
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element,
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gst::StreamError::Decode,
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["Invalid first timecode {:?}", timecode]
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);
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gst::FlowError::Error
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})?;
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gst_warning!(
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CAT,
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obj: element,
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"Invalid timecode {:?}, using previous {:?}",
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timecode,
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last_timecode
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);
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Ok(last_timecode)
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}
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}
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}
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/// Calculate a timestamp from the timecode and make sure to
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/// not produce timestamps jumping backwards
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fn update_timestamp(
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&mut self,
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element: &gst::Element,
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timecode: &gst_video::ValidVideoTimeCode,
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) {
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let nsecs = gst::ClockTime::from(timecode.nsec_since_daily_jam());
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if self.start_position.is_none() {
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self.start_position = nsecs;
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}
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let nsecs = if nsecs < self.start_position {
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gst_fixme!(
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CAT,
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obj: element,
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"New position {} < start position {}",
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nsecs,
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self.start_position
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);
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self.start_position
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} else {
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nsecs - self.start_position
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};
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if nsecs >= self.last_position {
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self.last_position = nsecs;
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} else {
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gst_fixme!(
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CAT,
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obj: element,
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"New position {} < last position {}",
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nsecs,
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self.last_position
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);
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}
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}
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fn add_buffer_metadata(
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&mut self,
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element: &gst::Element,
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buffer: &mut gst::buffer::Buffer,
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timecode: &gst_video::ValidVideoTimeCode,
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framerate: &gst::Fraction,
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) {
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let buffer = buffer.get_mut().unwrap();
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gst_video::VideoTimeCodeMeta::add(buffer, &timecode);
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self.update_timestamp(element, &timecode);
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buffer.set_pts(self.last_position);
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buffer.set_duration(
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gst::SECOND
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.mul_div_ceil(*framerate.denom() as u64, *framerate.numer() as u64)
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.unwrap_or(gst::CLOCK_TIME_NONE),
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);
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}
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fn create_events(
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&mut self,
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element: &gst::Element,
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format: Format,
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framerate: &gst::Fraction,
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) -> Vec<gst::Event> {
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let mut events = Vec::new();
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if self.format != Some(format) {
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self.format = Some(format);
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let caps = match format {
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Format::Cea708Cdp => gst::Caps::builder("closedcaption/x-cea-708")
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.field("format", &"cdp")
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.field("framerate", framerate)
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.build(),
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Format::Cea608 => gst::Caps::builder("closedcaption/x-cea-608")
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.field("format", &"s334-1a")
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.field("framerate", framerate)
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.build(),
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};
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events.push(gst::Event::new_caps(&caps).build());
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gst_info!(CAT, obj: element, "Caps changed to {:?}", &caps);
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}
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if self.need_segment {
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let segment = gst::FormattedSegment::<gst::format::Time>::new();
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events.push(gst::Event::new_segment(&segment).build());
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self.need_segment = false;
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}
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events.extend(self.pending_events.drain(..));
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events
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}
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2018-12-28 22:00:28 +00:00
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}
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struct MccParse {
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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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}
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#[derive(Debug)]
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struct OffsetVec {
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vec: Vec<u8>,
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offset: usize,
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len: usize,
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}
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impl AsRef<[u8]> for OffsetVec {
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fn as_ref(&self) -> &[u8] {
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&self.vec[self.offset..(self.offset + self.len)]
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}
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}
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impl AsMut<[u8]> for OffsetVec {
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fn as_mut(&mut self) -> &mut [u8] {
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&mut self.vec[self.offset..(self.offset + self.len)]
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}
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}
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impl MccParse {
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fn set_pad_functions(sinkpad: &gst::Pad, srcpad: &gst::Pad) {
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sinkpad.set_chain_function(|pad, parent, buffer| {
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MccParse::catch_panic_pad_function(
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parent,
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|| Err(gst::FlowError::Error),
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|parse, element| parse.sink_chain(pad, element, buffer),
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)
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});
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sinkpad.set_event_function(|pad, parent, event| {
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MccParse::catch_panic_pad_function(
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parent,
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|| false,
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|parse, element| parse.sink_event(pad, element, event),
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)
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});
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srcpad.set_event_function(|pad, parent, event| {
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MccParse::catch_panic_pad_function(
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parent,
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|| false,
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|parse, element| parse.src_event(pad, element, event),
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)
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});
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srcpad.set_query_function(|pad, parent, query| {
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MccParse::catch_panic_pad_function(
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parent,
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|| false,
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|parse, element| parse.src_query(pad, element, query),
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)
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});
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}
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fn handle_buffer(
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&self,
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element: &gst::Element,
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buffer: Option<gst::Buffer>,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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let mut state = self.state.lock().unwrap();
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let drain;
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if let Some(buffer) = buffer {
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let buffer = buffer.into_mapped_buffer_readable().map_err(|_| {
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gst_element_error!(
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element,
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gst::ResourceError::Read,
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["Failed to map buffer readable"]
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);
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gst::FlowError::Error
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})?;
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state.reader.push(buffer);
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drain = false;
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} else {
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drain = true;
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}
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loop {
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let line = state.get_line(drain);
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match line {
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Ok(Some(MccLine::Caption(tc, data))) => {
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gst_trace!(
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2019-01-21 19:45:00 +00:00
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CAT,
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2018-12-28 22:00:28 +00:00
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obj: element,
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"Got caption buffer with timecode {:?} and size {}",
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tc,
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data.len()
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);
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if data.len() < 3 {
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gst_debug!(
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2019-01-21 19:45:00 +00:00
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CAT,
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2018-12-28 22:00:28 +00:00
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obj: element,
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"Too small caption packet: {}",
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data.len(),
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);
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continue;
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}
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let format = match (data[0], data[1]) {
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(0x61, 0x01) => Format::Cea708Cdp,
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(0x61, 0x02) => Format::Cea608,
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(did, sdid) => {
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2019-01-21 19:45:00 +00:00
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gst_debug!(CAT, obj: element, "Unknown DID {:x} SDID {:x}", did, sdid);
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2018-12-28 22:00:28 +00:00
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continue;
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}
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};
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let len = data[2];
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if data.len() < 3 + len as usize {
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gst_debug!(
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2019-01-21 19:45:00 +00:00
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CAT,
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2018-12-28 22:00:28 +00:00
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obj: element,
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"Too small caption packet: {} < {}",
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data.len(),
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3 + len,
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);
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continue;
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}
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2019-01-21 19:45:00 +00:00
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state = self.handle_line(element, tc, data, format, state)?;
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2018-12-28 22:00:28 +00:00
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}
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Ok(Some(MccLine::TimeCodeRate(rate, df))) => {
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gst_debug!(
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2019-01-21 19:45:00 +00:00
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CAT,
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2018-12-28 22:00:28 +00:00
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obj: element,
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"Got timecode rate {} (drop frame {})",
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rate,
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df
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);
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state.timecode_rate = Some((rate, df));
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}
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Ok(Some(line)) => {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_debug!(CAT, obj: element, "Got line '{:?}'", line);
|
2018-12-28 22:00:28 +00:00
|
|
|
}
|
|
|
|
Err((line, err)) => {
|
|
|
|
gst_element_error!(
|
|
|
|
element,
|
|
|
|
gst::StreamError::Decode,
|
|
|
|
["Couldn't parse line '{:?}': {:?}", line, err]
|
|
|
|
);
|
|
|
|
|
|
|
|
break Err(gst::FlowError::Error);
|
|
|
|
}
|
|
|
|
Ok(None) => break Ok(gst::FlowSuccess::Ok),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-01-21 19:45:00 +00:00
|
|
|
fn handle_line(
|
|
|
|
&self,
|
|
|
|
element: &gst::Element,
|
|
|
|
tc: TimeCode,
|
|
|
|
data: Vec<u8>,
|
|
|
|
format: Format,
|
|
|
|
mut state: MutexGuard<State>,
|
|
|
|
) -> Result<MutexGuard<State>, gst::FlowError> {
|
|
|
|
let (framerate, drop_frame) = match state.timecode_rate {
|
|
|
|
Some((rate, false)) => (gst::Fraction::new(rate as i32, 1), false),
|
|
|
|
Some((rate, true)) => (gst::Fraction::new(rate as i32 * 1000, 1001), true),
|
|
|
|
None => {
|
|
|
|
gst_element_error!(
|
|
|
|
element,
|
|
|
|
gst::StreamError::Decode,
|
|
|
|
["Got caption before time code rate"]
|
|
|
|
);
|
|
|
|
|
|
|
|
return Err(gst::FlowError::Error);
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
let events = state.create_events(element, format, &framerate);
|
|
|
|
let timecode = state.handle_timecode(element, tc, framerate, drop_frame)?;
|
|
|
|
|
|
|
|
let len = data[2] as usize;
|
|
|
|
let mut buffer = gst::Buffer::from_mut_slice(OffsetVec {
|
|
|
|
vec: data,
|
|
|
|
offset: 3,
|
|
|
|
len,
|
|
|
|
});
|
|
|
|
|
|
|
|
state.add_buffer_metadata(element, &mut buffer, &timecode, &framerate);
|
|
|
|
|
2019-01-25 23:41:12 +00:00
|
|
|
// Update the last_timecode to the current one
|
|
|
|
state.last_timecode = Some(timecode);
|
|
|
|
|
2019-01-21 19:45:00 +00:00
|
|
|
// Drop our state mutex while we push out buffers or events
|
|
|
|
drop(state);
|
|
|
|
|
|
|
|
for event in events {
|
|
|
|
gst_debug!(CAT, obj: element, "Pushing event {:?}", event);
|
|
|
|
self.srcpad.push_event(event);
|
|
|
|
}
|
|
|
|
|
|
|
|
self.srcpad.push(buffer).map_err(|err| {
|
|
|
|
gst_error!(CAT, obj: element, "Pushing buffer returned {:?}", err);
|
|
|
|
err
|
|
|
|
})?;
|
|
|
|
|
|
|
|
Ok(self.state.lock().unwrap())
|
|
|
|
}
|
|
|
|
|
2018-12-28 22:00:28 +00:00
|
|
|
fn sink_chain(
|
|
|
|
&self,
|
|
|
|
pad: &gst::Pad,
|
|
|
|
element: &gst::Element,
|
|
|
|
buffer: gst::Buffer,
|
|
|
|
) -> Result<gst::FlowSuccess, gst::FlowError> {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
|
2018-12-28 22:00:28 +00:00
|
|
|
|
|
|
|
self.handle_buffer(element, Some(buffer))
|
|
|
|
}
|
|
|
|
|
|
|
|
fn sink_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
|
|
|
|
use gst::EventView;
|
|
|
|
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Handling event {:?}", event);
|
2018-12-28 22:00:28 +00:00
|
|
|
|
|
|
|
match event.view() {
|
|
|
|
EventView::Caps(_) => {
|
|
|
|
// We send a proper caps event from the chain function later
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Dropping caps event");
|
2018-12-28 22:00:28 +00:00
|
|
|
true
|
|
|
|
}
|
|
|
|
EventView::Segment(_) => {
|
|
|
|
// We send a gst::Format::Time segment event later when needed
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Dropping segment event");
|
2018-12-28 22:00:28 +00:00
|
|
|
true
|
|
|
|
}
|
|
|
|
EventView::FlushStop(_) => {
|
|
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
state.reader.clear();
|
|
|
|
state.parser.reset();
|
|
|
|
state.need_segment = true;
|
|
|
|
state.pending_events.clear();
|
2019-02-07 18:51:12 +00:00
|
|
|
state.start_position = gst::ClockTime::from_seconds(0);
|
|
|
|
state.last_position = gst::ClockTime::from_seconds(0);
|
|
|
|
state.last_timecode = None;
|
|
|
|
state.timecode_rate = None;
|
2018-12-28 22:00:28 +00:00
|
|
|
|
|
|
|
pad.event_default(element, event)
|
|
|
|
}
|
|
|
|
EventView::Eos(_) => {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Draining");
|
2018-12-28 22:00:28 +00:00
|
|
|
if let Err(err) = self.handle_buffer(element, None) {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_error!(CAT, obj: pad, "Failed to drain parser: {:?}", err);
|
2018-12-28 22:00:28 +00:00
|
|
|
}
|
|
|
|
pad.event_default(element, event)
|
|
|
|
}
|
|
|
|
_ => {
|
|
|
|
if event.is_sticky()
|
|
|
|
&& !self.srcpad.has_current_caps()
|
|
|
|
&& event.get_type() > gst::EventType::Caps
|
|
|
|
{
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Deferring sticky event until we have caps");
|
2018-12-28 22:00:28 +00:00
|
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
state.pending_events.push(event);
|
|
|
|
true
|
|
|
|
} else {
|
|
|
|
pad.event_default(element, event)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn src_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
|
|
|
|
use gst::EventView;
|
|
|
|
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Handling event {:?}", event);
|
2018-12-28 22:00:28 +00:00
|
|
|
match event.view() {
|
|
|
|
EventView::Seek(_) => {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Dropping seek event");
|
2018-12-28 22:00:28 +00:00
|
|
|
false
|
|
|
|
}
|
|
|
|
_ => pad.event_default(element, event),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn src_query(&self, pad: &gst::Pad, element: &gst::Element, query: &mut gst::QueryRef) -> bool {
|
|
|
|
use gst::QueryView;
|
|
|
|
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_log!(CAT, obj: pad, "Handling query {:?}", query);
|
2018-12-28 22:00:28 +00:00
|
|
|
|
|
|
|
match query.view_mut() {
|
|
|
|
QueryView::Seeking(mut q) => {
|
|
|
|
// We don't support any seeking at all
|
|
|
|
let fmt = q.get_format();
|
|
|
|
q.set(
|
|
|
|
false,
|
|
|
|
gst::GenericFormattedValue::Other(fmt, -1),
|
|
|
|
gst::GenericFormattedValue::Other(fmt, -1),
|
|
|
|
);
|
|
|
|
true
|
|
|
|
}
|
|
|
|
QueryView::Position(ref mut q) => {
|
|
|
|
// For Time answer ourselfs, otherwise forward
|
|
|
|
if q.get_format() == gst::Format::Time {
|
|
|
|
let state = self.state.lock().unwrap();
|
|
|
|
q.set(state.last_position);
|
|
|
|
true
|
|
|
|
} else {
|
|
|
|
self.sinkpad.peer_query(query)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
_ => pad.query_default(element, query),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectSubclass for MccParse {
|
|
|
|
const NAME: &'static str = "RsMccParse";
|
|
|
|
type ParentType = gst::Element;
|
|
|
|
type Instance = gst::subclass::ElementInstanceStruct<Self>;
|
|
|
|
type Class = subclass::simple::ClassStruct<Self>;
|
|
|
|
|
|
|
|
glib_object_subclass!();
|
|
|
|
|
|
|
|
fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
|
|
|
|
let templ = klass.get_pad_template("sink").unwrap();
|
|
|
|
let sinkpad = gst::Pad::new_from_template(&templ, "sink");
|
|
|
|
let templ = klass.get_pad_template("src").unwrap();
|
|
|
|
let srcpad = gst::Pad::new_from_template(&templ, "src");
|
|
|
|
|
|
|
|
MccParse::set_pad_functions(&sinkpad, &srcpad);
|
|
|
|
|
|
|
|
Self {
|
|
|
|
srcpad,
|
|
|
|
sinkpad,
|
|
|
|
state: Mutex::new(State::default()),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
|
|
|
|
klass.set_metadata(
|
|
|
|
"Mcc Parse",
|
|
|
|
"Parser/ClosedCaption",
|
|
|
|
"Parses MCC Closed Caption Files",
|
|
|
|
"Sebastian Dröge <sebastian@centricular.com>",
|
|
|
|
);
|
|
|
|
|
|
|
|
let mut caps = gst::Caps::new_empty();
|
|
|
|
{
|
|
|
|
let caps = caps.get_mut().unwrap();
|
|
|
|
|
|
|
|
let s = gst::Structure::builder("closedcaption/x-cea-708")
|
|
|
|
.field("format", &"cdp")
|
|
|
|
.build();
|
|
|
|
caps.append_structure(s);
|
|
|
|
|
|
|
|
let s = gst::Structure::builder("closedcaption/x-cea-608")
|
|
|
|
.field("format", &"s334-1a")
|
|
|
|
.build();
|
|
|
|
caps.append_structure(s);
|
|
|
|
}
|
|
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
|
|
"src",
|
|
|
|
gst::PadDirection::Src,
|
|
|
|
gst::PadPresence::Always,
|
|
|
|
&caps,
|
2019-01-29 15:26:40 +00:00
|
|
|
)
|
|
|
|
.unwrap();
|
2018-12-28 22:00:28 +00:00
|
|
|
klass.add_pad_template(src_pad_template);
|
|
|
|
|
|
|
|
let caps = gst::Caps::builder("application/x-mcc")
|
|
|
|
.field("version", &gst::List::new(&[&1i32, &2i32]))
|
|
|
|
.build();
|
|
|
|
let sink_pad_template = gst::PadTemplate::new(
|
|
|
|
"sink",
|
|
|
|
gst::PadDirection::Sink,
|
|
|
|
gst::PadPresence::Always,
|
|
|
|
&caps,
|
2019-01-29 15:26:40 +00:00
|
|
|
)
|
|
|
|
.unwrap();
|
2018-12-28 22:00:28 +00:00
|
|
|
klass.add_pad_template(sink_pad_template);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectImpl for MccParse {
|
|
|
|
glib_object_impl!();
|
|
|
|
|
|
|
|
fn constructed(&self, obj: &glib::Object) {
|
|
|
|
self.parent_constructed(obj);
|
|
|
|
|
|
|
|
let element = obj.downcast_ref::<gst::Element>().unwrap();
|
|
|
|
element.add_pad(&self.sinkpad).unwrap();
|
|
|
|
element.add_pad(&self.srcpad).unwrap();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ElementImpl for MccParse {
|
|
|
|
fn change_state(
|
|
|
|
&self,
|
|
|
|
element: &gst::Element,
|
|
|
|
transition: gst::StateChange,
|
|
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
2019-01-21 19:45:00 +00:00
|
|
|
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
|
2018-12-28 22:00:28 +00:00
|
|
|
|
|
|
|
match transition {
|
|
|
|
gst::StateChange::ReadyToPaused | gst::StateChange::PausedToReady => {
|
|
|
|
// Reset the whole state
|
|
|
|
let mut state = self.state.lock().unwrap();
|
|
|
|
*state = State::default();
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
|
|
|
self.parent_change_state(element, transition)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
|
|
|
|
gst::Element::register(plugin, "mccparse", 0, MccParse::get_type())
|
|
|
|
}
|