2020-03-13 01:10:23 +00:00
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// Copyright (C) 2020 Mathieu Duponchelle <mathieu@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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use super::cea608tott_ffi as ffi;
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use atomic_refcell::AtomicRefCell;
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fn is_basicna(cc_data: u16) -> bool {
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0x0000 != (0x6000 & cc_data)
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}
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fn is_westeu(cc_data: u16) -> bool {
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0x1220 == (0x7660 & cc_data)
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}
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fn is_specialna(cc_data: u16) -> bool {
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0x1130 == (0x7770 & cc_data)
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}
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2020-03-26 08:59:43 +00:00
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#[allow(clippy::trivially_copy_pass_by_ref)]
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2020-03-13 01:10:23 +00:00
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fn eia608_from_utf8_1(c: &[u8; 5]) -> u16 {
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assert!(c[4] == 0);
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unsafe { ffi::eia608_from_utf8_1(c.as_ptr() as *const _, 0) }
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}
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fn eia608_row_column_preamble(row: i32, col: i32) -> u16 {
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unsafe {
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/* Hardcoded chan and underline */
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ffi::eia608_row_column_pramble(row, col, 0, 0)
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}
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}
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fn eia608_control_command(cmd: ffi::eia608_control_t) -> u16 {
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unsafe { ffi::eia608_control_command(cmd, 0) }
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}
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fn eia608_from_basicna(bna1: u16, bna2: u16) -> u16 {
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unsafe { ffi::eia608_from_basicna(bna1, bna2) }
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}
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fn buffer_from_cc_data(cc_data: u16) -> gst::buffer::Buffer {
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let mut ret = gst::Buffer::with_size(2).unwrap();
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{
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let buf_mut = ret.get_mut().unwrap();
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let cc_data = cc_data.to_be_bytes();
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gst_trace!(CAT, "CC data: {:x} {:x}", cc_data[0], cc_data[1]);
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buf_mut.copy_from_slice(0, &cc_data).unwrap();
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}
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ret
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}
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fn control_command_buffer(buffers: &mut Vec<gst::Buffer>, cmd: ffi::eia608_control_t) {
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let cc_data = eia608_control_command(cmd);
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buffers.push(buffer_from_cc_data(cc_data));
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buffers.push(buffer_from_cc_data(cc_data));
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}
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fn erase_non_displayed_memory(buffers: &mut Vec<gst::Buffer>) {
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control_command_buffer(
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buffers,
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ffi::eia608_control_t_eia608_control_erase_non_displayed_memory,
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);
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}
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fn erase_display_memory(
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bufferlist: &mut gst::BufferListRef,
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pts: gst::ClockTime,
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duration: gst::ClockTime,
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) {
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let cc_data = eia608_control_command(ffi::eia608_control_t_eia608_control_erase_display_memory);
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let mut buffer = buffer_from_cc_data(cc_data);
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{
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let buf_mut = buffer.get_mut().unwrap();
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buf_mut.set_pts(pts);
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buf_mut.set_duration(duration);
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}
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bufferlist.insert(0, buffer);
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let mut buffer = buffer_from_cc_data(cc_data);
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{
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let buf_mut = buffer.get_mut().unwrap();
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buf_mut.set_pts(pts + duration);
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buf_mut.set_duration(duration);
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}
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bufferlist.insert(1, buffer);
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}
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fn resume_caption_loading(buffers: &mut Vec<gst::Buffer>) {
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control_command_buffer(
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buffers,
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ffi::eia608_control_t_eia608_control_resume_caption_loading,
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);
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}
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fn end_of_caption(buffers: &mut Vec<gst::Buffer>) {
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control_command_buffer(buffers, ffi::eia608_control_t_eia608_control_end_of_caption);
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}
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fn preamble_buffer(buffers: &mut Vec<gst::Buffer>, row: i32, col: i32) {
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let cc_data = eia608_row_column_preamble(row, col);
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buffers.push(buffer_from_cc_data(cc_data));
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buffers.push(buffer_from_cc_data(cc_data));
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}
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fn bna_buffer(buffers: &mut Vec<gst::Buffer>, bna1: u16, bna2: u16) {
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let cc_data = eia608_from_basicna(bna1, bna2);
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buffers.push(buffer_from_cc_data(cc_data));
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}
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const DEFAULT_FPS_N: i32 = 30;
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const DEFAULT_FPS_D: i32 = 1;
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struct State {
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framerate: gst::Fraction,
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last_ts: gst::ClockTime,
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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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framerate: gst::Fraction::new(DEFAULT_FPS_N, DEFAULT_FPS_D),
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last_ts: gst::CLOCK_TIME_NONE,
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}
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}
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}
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struct TtToCea608 {
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srcpad: gst::Pad,
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sinkpad: gst::Pad,
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state: AtomicRefCell<State>,
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}
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lazy_static! {
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static ref CAT: gst::DebugCategory = gst::DebugCategory::new(
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"tttocea608",
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gst::DebugColorFlags::empty(),
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Some("TT CEA 608 Element"),
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);
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static ref SPACE: u16 = eia608_from_utf8_1(&[0x20, 0, 0, 0, 0]);
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}
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impl TtToCea608 {
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fn sink_chain(
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&self,
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pad: &gst::Pad,
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element: &gst::Element,
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buffer: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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gst_debug!(CAT, obj: pad, "Handling buffer {:?}", buffer);
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let mut row = 13;
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let mut col = 0;
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let mut pts = match buffer.get_pts() {
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gst::CLOCK_TIME_NONE => {
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gst_element_error!(
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element,
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gst::StreamError::Format,
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["Stream with timestamped buffers required"]
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);
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Err(gst::FlowError::Error)
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}
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pts => Ok(pts),
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}?;
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let duration = match buffer.get_duration() {
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gst::CLOCK_TIME_NONE => {
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gst_element_error!(
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element,
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gst::StreamError::Format,
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["Buffers of stream need to have a duration"]
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);
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Err(gst::FlowError::Error)
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}
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duration => Ok(duration),
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}?;
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let mut state = self.state.borrow_mut();
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let mut buffers = vec![];
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let frame_duration = gst::SECOND
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.mul_div_floor(
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*state.framerate.denom() as u64,
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*state.framerate.numer() as u64,
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)
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.unwrap();
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{
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resume_caption_loading(&mut buffers);
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erase_non_displayed_memory(&mut buffers);
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preamble_buffer(&mut buffers, row, 0);
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let data = buffer.map_readable().map_err(|_| {
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gst_error!(CAT, obj: pad, "Can't map buffer readable");
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gst::FlowError::Error
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})?;
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let data = std::str::from_utf8(&data).map_err(|err| {
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gst_error!(CAT, obj: pad, "Can't decode utf8: {}", err);
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gst::FlowError::Error
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})?;
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let mut prev_char: u16 = 0;
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for c in data.chars() {
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if c == '\n' {
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if prev_char != 0 {
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buffers.push(buffer_from_cc_data(prev_char));
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prev_char = 0;
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}
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row += 1;
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if row > 14 {
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break;
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}
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preamble_buffer(&mut buffers, row, 0);
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col = 0;
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continue;
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} else if c == '\r' {
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continue;
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}
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let mut encoded = [0; 5];
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c.encode_utf8(&mut encoded);
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let mut cc_data = eia608_from_utf8_1(&encoded);
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if cc_data == 0 {
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gst_warning!(CAT, obj: element, "Not translating UTF8: {}", c);
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cc_data = *SPACE;
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}
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if is_basicna(prev_char) {
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if is_basicna(cc_data) {
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bna_buffer(&mut buffers, prev_char, cc_data);
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} else if is_westeu(cc_data) {
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// extended characters overwrite the previous character,
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// so insert a dummy char then write the extended char
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bna_buffer(&mut buffers, prev_char, *SPACE);
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buffers.push(buffer_from_cc_data(cc_data));
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} else {
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buffers.push(buffer_from_cc_data(prev_char));
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buffers.push(buffer_from_cc_data(cc_data));
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}
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prev_char = 0;
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} else if is_westeu(cc_data) {
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// extended characters overwrite the previous character,
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// so insert a dummy char then write the extended char
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buffers.push(buffer_from_cc_data(*SPACE));
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buffers.push(buffer_from_cc_data(cc_data));
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} else if is_basicna(cc_data) {
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prev_char = cc_data;
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} else {
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buffers.push(buffer_from_cc_data(cc_data));
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}
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if is_specialna(cc_data) {
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resume_caption_loading(&mut buffers);
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}
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col += 1;
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if col > 32 {
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gst_warning!(
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CAT,
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obj: element,
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"Dropping character after 32nd column: {}",
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c
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);
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continue;
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}
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}
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if prev_char != 0 {
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buffers.push(buffer_from_cc_data(prev_char));
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}
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end_of_caption(&mut buffers);
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}
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let mut bufferlist = gst::BufferList::new();
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let erase_display_pts = {
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if state.last_ts.is_some() && state.last_ts < pts {
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state.last_ts
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} else {
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gst::CLOCK_TIME_NONE
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}
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};
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state.last_ts = pts + duration;
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// FIXME: the following code may result in overlapping timestamps
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// when too many characters need encoding for a given interval
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/* Account for doubled end_of_caption control */
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pts += frame_duration;
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for mut buffer in buffers.drain(..).rev() {
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let buf_mut = buffer.get_mut().unwrap();
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let prev_pts = pts;
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buf_mut.set_pts(pts);
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if pts > frame_duration {
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pts -= frame_duration;
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} else {
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pts = 0.into();
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}
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buf_mut.set_duration(prev_pts - pts);
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bufferlist.get_mut().unwrap().insert(0, buffer);
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}
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if erase_display_pts.is_some() {
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erase_display_memory(
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bufferlist.get_mut().unwrap(),
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erase_display_pts,
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frame_duration,
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);
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}
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self.srcpad.push_list(bufferlist).map_err(|err| {
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gst_error!(CAT, obj: &self.srcpad, "Pushing buffer returned {:?}", err);
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err
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})
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}
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fn sink_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
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gst_log!(CAT, obj: pad, "Handling event {:?}", event);
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use gst::EventView;
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match event.view() {
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EventView::Caps(..) => {
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let mut downstream_caps = match self.srcpad.get_allowed_caps() {
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None => self.srcpad.get_pad_template_caps().unwrap(),
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Some(caps) => caps,
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};
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if downstream_caps.is_empty() {
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gst_error!(CAT, obj: pad, "Empty downstream caps");
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return false;
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}
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let caps = downstream_caps.make_mut();
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let s = caps.get_mut_structure(0).unwrap();
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|
s.fixate_field_nearest_fraction(
|
|
|
|
"framerate",
|
|
|
|
gst::Fraction::new(DEFAULT_FPS_N, DEFAULT_FPS_D),
|
|
|
|
);
|
|
|
|
s.fixate();
|
|
|
|
|
|
|
|
let mut state = self.state.borrow_mut();
|
|
|
|
state.framerate = s.get_some::<gst::Fraction>("framerate").unwrap();
|
|
|
|
|
|
|
|
gst_debug!(CAT, obj: pad, "Pushing caps {}", caps);
|
|
|
|
|
|
|
|
let new_event = gst::Event::new_caps(&downstream_caps).build();
|
|
|
|
|
|
|
|
return self.srcpad.push_event(new_event);
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
|
|
|
pad.event_default(Some(element), event)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectSubclass for TtToCea608 {
|
|
|
|
const NAME: &'static str = "TtToCea608";
|
|
|
|
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, Some("sink"));
|
|
|
|
let templ = klass.get_pad_template("src").unwrap();
|
|
|
|
let srcpad = gst::Pad::new_from_template(&templ, Some("src"));
|
|
|
|
|
|
|
|
sinkpad.set_chain_function(|pad, parent, buffer| {
|
|
|
|
TtToCea608::catch_panic_pad_function(
|
|
|
|
parent,
|
|
|
|
|| Err(gst::FlowError::Error),
|
|
|
|
|this, element| this.sink_chain(pad, element, buffer),
|
|
|
|
)
|
|
|
|
});
|
|
|
|
sinkpad.set_event_function(|pad, parent, event| {
|
|
|
|
TtToCea608::catch_panic_pad_function(
|
|
|
|
parent,
|
|
|
|
|| false,
|
|
|
|
|this, element| this.sink_event(pad, element, event),
|
|
|
|
)
|
|
|
|
});
|
|
|
|
|
|
|
|
sinkpad.use_fixed_caps();
|
|
|
|
srcpad.use_fixed_caps();
|
|
|
|
|
|
|
|
Self {
|
|
|
|
srcpad,
|
|
|
|
sinkpad,
|
|
|
|
state: AtomicRefCell::new(State::default()),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
|
|
|
|
klass.set_metadata(
|
|
|
|
"TT to CEA-608",
|
|
|
|
"Generic",
|
|
|
|
"Converts timed text to CEA-608 Closed Captions",
|
|
|
|
"Mathieu Duponchelle <mathieu@centricular.com>",
|
|
|
|
);
|
|
|
|
|
|
|
|
let caps = gst::Caps::builder("text/x-raw").build();
|
|
|
|
|
|
|
|
let sink_pad_template = gst::PadTemplate::new(
|
|
|
|
"sink",
|
|
|
|
gst::PadDirection::Sink,
|
|
|
|
gst::PadPresence::Always,
|
|
|
|
&caps,
|
|
|
|
)
|
|
|
|
.unwrap();
|
|
|
|
klass.add_pad_template(sink_pad_template);
|
|
|
|
|
|
|
|
let framerate = gst::FractionRange::new(
|
|
|
|
gst::Fraction::new(1, std::i32::MAX),
|
|
|
|
gst::Fraction::new(std::i32::MAX, 1),
|
|
|
|
);
|
|
|
|
|
|
|
|
let caps = gst::Caps::builder("closedcaption/x-cea-608")
|
|
|
|
.field("format", &"raw")
|
|
|
|
.field("framerate", &framerate)
|
|
|
|
.build();
|
|
|
|
|
|
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
|
|
"src",
|
|
|
|
gst::PadDirection::Src,
|
|
|
|
gst::PadPresence::Always,
|
|
|
|
&caps,
|
|
|
|
)
|
|
|
|
.unwrap();
|
|
|
|
klass.add_pad_template(src_pad_template);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ObjectImpl for TtToCea608 {
|
|
|
|
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 TtToCea608 {
|
|
|
|
fn change_state(
|
|
|
|
&self,
|
|
|
|
element: &gst::Element,
|
|
|
|
transition: gst::StateChange,
|
|
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
|
|
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
|
|
|
|
|
|
|
|
match transition {
|
|
|
|
gst::StateChange::ReadyToPaused => {
|
|
|
|
let mut state = self.state.borrow_mut();
|
|
|
|
*state = State::default();
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
|
|
|
let ret = self.parent_change_state(element, transition)?;
|
|
|
|
|
|
|
|
match transition {
|
|
|
|
gst::StateChange::PausedToReady => {
|
|
|
|
let mut state = self.state.borrow_mut();
|
|
|
|
*state = State::default();
|
|
|
|
}
|
|
|
|
_ => (),
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(ret)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
|
|
|
|
gst::Element::register(
|
|
|
|
Some(plugin),
|
|
|
|
"tttocea608",
|
|
|
|
gst::Rank::None,
|
|
|
|
TtToCea608::get_type(),
|
|
|
|
)
|
|
|
|
}
|