mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-09-27 06:20:03 +00:00
958 lines
29 KiB
Rust
958 lines
29 KiB
Rust
// Copyright (C) 2020 Mathieu Duponchelle <mathieu@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 once_cell::sync::Lazy;
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use std::cmp;
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use std::sync::{Mutex, MutexGuard};
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use serde::Deserialize;
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use crate::line_reader::LineReader;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"jsongstparse",
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gst::DebugColorFlags::empty(),
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Some("GStreamer Json Parser Element"),
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)
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});
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#[derive(Debug)]
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struct PullState {
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need_stream_start: bool,
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stream_id: String,
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offset: u64,
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duration: Option<gst::ClockTime>,
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}
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impl PullState {
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fn new(imp: &JsonGstParse, pad: &gst::Pad) -> Self {
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Self {
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need_stream_start: true,
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stream_id: pad
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.create_stream_id(&*imp.instance(), Some("src"))
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.to_string(),
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offset: 0,
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duration: None,
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}
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}
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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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need_segment: bool,
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need_caps: bool,
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format: Option<String>,
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pending_events: Vec<gst::Event>,
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last_position: Option<gst::ClockTime>,
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segment: gst::FormattedSegment<gst::ClockTime>,
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// Pull mode
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pull: Option<PullState>,
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// seeking
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seeking: bool,
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discont: bool,
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seek_seqnum: Option<gst::Seqnum>,
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last_raw_line: Vec<u8>,
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replay_last_line: bool,
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need_flush_stop: 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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need_segment: true,
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need_caps: true,
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format: None,
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pending_events: Vec::new(),
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last_position: None,
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segment: gst::FormattedSegment::<gst::ClockTime>::new(),
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pull: None,
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seeking: false,
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discont: false,
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seek_seqnum: None,
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last_raw_line: Vec::new(),
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replay_last_line: false,
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need_flush_stop: false,
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}
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}
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}
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#[derive(Deserialize, Debug)]
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enum Line<'a> {
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Header {
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format: String,
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},
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Buffer {
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pts: Option<gst::ClockTime>,
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duration: Option<gst::ClockTime>,
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#[serde(borrow)]
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data: &'a serde_json::value::RawValue,
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},
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}
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impl State {
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fn line(&mut self, drain: bool) -> Result<Option<Line>, (&[u8], serde_json::Error)> {
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let line = if self.replay_last_line {
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self.replay_last_line = false;
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&self.last_raw_line
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} else {
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match self.reader.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) => {
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self.last_raw_line = line.to_vec();
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line
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}
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}
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};
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let line: Line = serde_json::from_slice(line).map_err(|err| (line, err))?;
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Ok(Some(line))
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}
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fn create_events(&mut self, imp: &JsonGstParse) -> Vec<gst::Event> {
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let mut events = Vec::new();
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if self.need_flush_stop {
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let mut b = gst::event::FlushStop::builder(true);
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if let Some(seek_seqnum) = self.seek_seqnum {
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b = b.seqnum(seek_seqnum);
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}
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events.push(b.build());
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self.need_flush_stop = false;
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}
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if let Some(pull) = &mut self.pull {
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if pull.need_stream_start {
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events.push(gst::event::StreamStart::new(&pull.stream_id));
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pull.need_stream_start = false;
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}
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}
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if self.need_caps {
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let mut caps_builder = gst::Caps::builder("application/x-json");
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if let Some(format) = &self.format {
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caps_builder = caps_builder.field("format", format);
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}
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let caps = caps_builder.build();
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events.push(gst::event::Caps::new(&caps));
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gst::info!(CAT, imp: imp, "Caps changed to {:?}", &caps);
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self.need_caps = false;
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}
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if self.need_segment {
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let mut b = gst::event::Segment::builder(&self.segment);
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if let Some(seek_seqnum) = self.seek_seqnum {
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b = b.seqnum(seek_seqnum);
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}
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events.push(b.build());
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self.need_segment = false;
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}
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events.append(&mut self.pending_events);
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events
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}
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fn add_buffer_metadata(
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&mut self,
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buffer: &mut gst::buffer::Buffer,
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pts: Option<gst::ClockTime>,
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duration: Option<gst::ClockTime>,
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) {
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let buffer = buffer.get_mut().unwrap();
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self.last_position = pts.opt_add(duration);
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buffer.set_pts(pts);
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if self.discont {
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buffer.set_flags(gst::BufferFlags::DISCONT);
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self.discont = false;
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}
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buffer.set_duration(duration);
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}
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}
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pub struct JsonGstParse {
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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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impl JsonGstParse {
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fn handle_buffer(
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&self,
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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 = if let Some(buffer) = buffer {
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let buffer = buffer.into_mapped_buffer_readable().map_err(|_| {
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gst::element_imp_error!(
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self,
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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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false
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} else {
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true
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};
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loop {
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let seeking = state.seeking;
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let line = state.line(drain);
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match line {
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Ok(Some(Line::Buffer {
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pts,
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duration,
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data,
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})) => {
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gst::debug!(
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CAT,
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imp: self,
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"Got buffer with timestamp {} and duration {}",
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pts.display(),
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duration.display(),
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);
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if !seeking {
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let data = data.to_string();
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let mut events = state.create_events(self);
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let mut buffer = gst::Buffer::from_mut_slice(data.into_bytes());
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if let Some(last_position) = state.last_position {
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if let Ok(Some(duration)) = pts.opt_checked_sub(last_position) {
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events.push(
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gst::event::Gap::builder(last_position)
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.duration(duration)
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.build(),
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);
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}
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}
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state.add_buffer_metadata(&mut buffer, pts, duration);
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let send_eos = buffer
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.pts()
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.opt_add(buffer.duration())
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.opt_ge(state.segment.stop())
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.unwrap_or(false);
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// Drop our state mutex while we push out buffers or events
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drop(state);
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for event in events {
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gst::debug!(CAT, imp: self, "Pushing event {:?}", event);
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self.srcpad.push_event(event);
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}
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self.srcpad.push(buffer).map_err(|err| {
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if err != gst::FlowError::Flushing {
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gst::error!(CAT, imp: self, "Pushing buffer returned {:?}", err);
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}
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err
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})?;
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if send_eos {
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return Err(gst::FlowError::Eos);
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}
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state = self.state.lock().unwrap();
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} else {
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state = self.handle_skipped_line(pts, state);
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}
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}
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Ok(Some(Line::Header { format })) => {
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if state.format.is_none() {
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state.format = Some(format);
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} else {
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gst::warning!(CAT, imp: self, "Ignoring format change",);
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}
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}
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Err((line, err)) => {
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gst::error!(
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CAT,
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imp: self,
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"Couldn't parse line '{:?}': {:?}",
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std::str::from_utf8(line),
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err
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);
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gst::element_imp_error!(
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self,
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gst::StreamError::Decode,
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["Couldn't parse line '{:?}': {:?}", line, err]
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);
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break Err(gst::FlowError::Error);
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}
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Ok(None) => {
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if drain && state.pull.is_some() {
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gst::debug!(CAT, imp: self, "Finished draining");
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break Err(gst::FlowError::Eos);
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}
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break Ok(gst::FlowSuccess::Ok);
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}
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}
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}
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}
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fn handle_skipped_line(
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&self,
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pts: impl Into<Option<gst::ClockTime>>,
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mut state: MutexGuard<State>,
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) -> MutexGuard<State> {
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if pts.into().opt_ge(state.segment.start()).unwrap_or(false) {
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state.seeking = false;
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state.discont = true;
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state.replay_last_line = true;
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state.need_flush_stop = true;
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gst::debug!(CAT, imp: self, "Done seeking");
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}
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drop(state);
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self.state.lock().unwrap()
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}
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fn sink_activate(&self, pad: &gst::Pad) -> Result<(), gst::LoggableError> {
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let mode = {
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let mut query = gst::query::Scheduling::new();
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let mut state = self.state.lock().unwrap();
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state.pull = None;
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if !pad.peer_query(&mut query) {
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gst::debug!(CAT, obj: pad, "Scheduling query failed on peer");
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gst::PadMode::Push
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} else if query
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.has_scheduling_mode_with_flags(gst::PadMode::Pull, gst::SchedulingFlags::SEEKABLE)
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{
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gst::debug!(CAT, obj: pad, "Activating in Pull mode");
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state.pull = Some(PullState::new(self, &self.srcpad));
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gst::PadMode::Pull
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} else {
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gst::debug!(CAT, obj: pad, "Activating in Push mode");
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gst::PadMode::Push
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}
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};
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pad.activate_mode(mode, true)?;
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Ok(())
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}
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fn start_task(&self) -> Result<(), gst::LoggableError> {
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let self_ = self.ref_counted();
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let res = self.sinkpad.start_task(move || {
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self_.loop_fn();
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});
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if res.is_err() {
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return Err(gst::loggable_error!(CAT, "Failed to start pad task"));
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}
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Ok(())
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}
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fn sink_activatemode(
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&self,
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_pad: &gst::Pad,
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mode: gst::PadMode,
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active: bool,
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) -> Result<(), gst::LoggableError> {
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if mode == gst::PadMode::Pull {
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if active {
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self.start_task()?;
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} else {
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let _ = self.sinkpad.stop_task();
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}
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}
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Ok(())
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}
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fn scan_duration(&self) -> Result<Option<gst::ClockTime>, gst::LoggableError> {
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gst::debug!(CAT, imp: self, "Scanning duration");
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/* First let's query the bytes duration upstream */
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let mut q = gst::query::Duration::new(gst::Format::Bytes);
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if !self.sinkpad.peer_query(&mut q) {
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return Err(gst::loggable_error!(
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CAT,
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"Failed to query upstream duration"
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));
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}
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let size = match q.result().try_into().ok().flatten() {
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Some(gst::format::Bytes(size)) => size,
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None => {
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return Err(gst::loggable_error!(
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CAT,
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"Failed to query upstream duration"
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));
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}
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};
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let mut offset = size;
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let mut buffers = Vec::new();
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let mut last_pts = None;
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loop {
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let scan_size = cmp::min(offset, 4096);
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offset -= scan_size;
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match self.sinkpad.pull_range(offset, scan_size as u32) {
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Ok(buffer) => {
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buffers.push(buffer);
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}
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Err(flow) => {
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return Err(gst::loggable_error!(
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CAT,
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"Failed to pull buffer while scanning duration: {:?}",
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flow
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));
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}
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}
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let mut reader = LineReader::new();
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for buf in buffers.iter().rev() {
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let buf = buf
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.clone()
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.into_mapped_buffer_readable()
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.map_err(|_| gst::loggable_error!(CAT, "Failed to map buffer readable"))?;
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reader.push(buf);
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}
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while let Some(line) = reader.line_with_drain(true) {
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if let Ok(Line::Buffer {
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pts,
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duration,
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data: _data,
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}) = serde_json::from_slice(line)
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{
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last_pts = pts.opt_add(duration);
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}
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}
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if last_pts.is_some() || offset == 0 {
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gst::debug!(
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CAT,
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imp: self,
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"Duration scan done, last_pts: {:?}",
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last_pts
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);
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break (Ok(last_pts));
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}
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}
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}
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fn push_eos(&self) {
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let mut state = self.state.lock().unwrap();
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if state.seeking {
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state.need_flush_stop = true;
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}
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let mut events = state.create_events(self);
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let mut eos_event = gst::event::Eos::builder();
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if let Some(seek_seqnum) = state.seek_seqnum {
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eos_event = eos_event.seqnum(seek_seqnum);
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}
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events.push(eos_event.build());
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// Drop our state mutex while we push out events
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drop(state);
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for event in events {
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gst::debug!(CAT, imp: self, "Pushing event {:?}", event);
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self.srcpad.push_event(event);
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}
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}
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fn loop_fn(&self) {
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let mut state = self.state.lock().unwrap();
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let State { ref mut pull, .. } = *state;
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let mut pull = pull.as_mut().unwrap();
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let offset = pull.offset;
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let scan_duration = pull.duration.is_none();
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pull.offset += 4096;
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drop(state);
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if scan_duration {
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match self.scan_duration() {
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Ok(pts) => {
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let mut state = self.state.lock().unwrap();
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let mut pull = state.pull.as_mut().unwrap();
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pull.duration = pts;
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}
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Err(err) => {
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err.log();
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gst::element_imp_error!(
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self,
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gst::StreamError::Decode,
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["Failed to scan duration"]
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);
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self.sinkpad.pause_task().unwrap();
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}
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}
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}
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let buffer = match self.sinkpad.pull_range(offset, 4096) {
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Ok(buffer) => Some(buffer),
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Err(gst::FlowError::Eos) => None,
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Err(gst::FlowError::Flushing) => {
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gst::debug!(CAT, obj: &self.sinkpad, "Pausing after pulling buffer, reason: flushing");
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self.sinkpad.pause_task().unwrap();
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return;
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}
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Err(flow) => {
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gst::error!(CAT, obj: &self.sinkpad, "Failed to pull, reason: {:?}", flow);
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gst::element_imp_error!(
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self,
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gst::StreamError::Failed,
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["Streaming stopped, failed to pull buffer"]
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);
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self.sinkpad.pause_task().unwrap();
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return;
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}
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};
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if let Err(flow) = self.handle_buffer(buffer) {
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match flow {
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gst::FlowError::Flushing => {
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gst::debug!(CAT, imp: self, "Pausing after flow {:?}", flow);
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}
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gst::FlowError::Eos => {
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self.push_eos();
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gst::debug!(CAT, imp: self, "Pausing after flow {:?}", flow);
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}
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_ => {
|
|
self.push_eos();
|
|
|
|
gst::error!(CAT, imp: self, "Pausing after flow {:?}", flow);
|
|
|
|
gst::element_imp_error!(
|
|
self,
|
|
gst::StreamError::Failed,
|
|
["Streaming stopped, reason: {:?}", flow]
|
|
);
|
|
}
|
|
}
|
|
|
|
self.sinkpad.pause_task().unwrap();
|
|
}
|
|
}
|
|
|
|
fn sink_chain(
|
|
&self,
|
|
pad: &gst::Pad,
|
|
buffer: gst::Buffer,
|
|
) -> Result<gst::FlowSuccess, gst::FlowError> {
|
|
gst::log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
|
|
|
|
self.handle_buffer(Some(buffer))
|
|
}
|
|
|
|
fn flush(&self, mut state: &mut State) {
|
|
state.reader.clear();
|
|
if let Some(pull) = &mut state.pull {
|
|
pull.offset = 0;
|
|
}
|
|
state.segment = gst::FormattedSegment::<gst::ClockTime>::new();
|
|
state.need_segment = true;
|
|
state.need_caps = true;
|
|
state.pending_events.clear();
|
|
state.last_position = None;
|
|
state.last_raw_line = [].to_vec();
|
|
state.format = None;
|
|
}
|
|
|
|
fn sink_event(&self, pad: &gst::Pad, event: gst::Event) -> bool {
|
|
use gst::EventView;
|
|
|
|
gst::log!(CAT, obj: pad, "Handling event {:?}", event);
|
|
|
|
match event.view() {
|
|
EventView::Caps(_) => {
|
|
// We send a proper caps event from the chain function later
|
|
gst::log!(CAT, obj: pad, "Dropping caps event");
|
|
true
|
|
}
|
|
EventView::Segment(_) => {
|
|
// We send a gst::Format::Time segment event later when needed
|
|
gst::log!(CAT, obj: pad, "Dropping segment event");
|
|
true
|
|
}
|
|
EventView::FlushStop(_) => {
|
|
let mut state = self.state.lock().unwrap();
|
|
self.flush(&mut state);
|
|
drop(state);
|
|
|
|
pad.event_default(Some(&*self.instance()), event)
|
|
}
|
|
EventView::Eos(_) => {
|
|
gst::log!(CAT, obj: pad, "Draining");
|
|
if let Err(err) = self.handle_buffer(None) {
|
|
gst::error!(CAT, obj: pad, "Failed to drain parser: {:?}", err);
|
|
}
|
|
pad.event_default(Some(&*self.instance()), event)
|
|
}
|
|
_ => {
|
|
if event.is_sticky()
|
|
&& !self.srcpad.has_current_caps()
|
|
&& event.type_() > gst::EventType::Caps
|
|
{
|
|
gst::log!(CAT, obj: pad, "Deferring sticky event until we have caps");
|
|
let mut state = self.state.lock().unwrap();
|
|
state.pending_events.push(event);
|
|
true
|
|
} else {
|
|
pad.event_default(Some(&*self.instance()), event)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn perform_seek(&self, event: &gst::event::Seek) -> bool {
|
|
if self.state.lock().unwrap().pull.is_none() {
|
|
gst::error!(CAT, imp: self, "seeking is only supported in pull mode");
|
|
return false;
|
|
}
|
|
|
|
let (rate, flags, start_type, start, stop_type, stop) = event.get();
|
|
|
|
let mut start: Option<gst::ClockTime> = match start.try_into() {
|
|
Ok(start) => start,
|
|
Err(_) => {
|
|
gst::error!(CAT, imp: self, "seek has invalid format");
|
|
return false;
|
|
}
|
|
};
|
|
|
|
let mut stop: Option<gst::ClockTime> = match stop.try_into() {
|
|
Ok(stop) => stop,
|
|
Err(_) => {
|
|
gst::error!(CAT, imp: self, "seek has invalid format");
|
|
return false;
|
|
}
|
|
};
|
|
|
|
if !flags.contains(gst::SeekFlags::FLUSH) {
|
|
gst::error!(CAT, imp: self, "only flushing seeks are supported");
|
|
return false;
|
|
}
|
|
|
|
if start_type == gst::SeekType::End || stop_type == gst::SeekType::End {
|
|
gst::error!(CAT, imp: self, "Relative seeks are not supported");
|
|
return false;
|
|
}
|
|
|
|
let seek_seqnum = event.seqnum();
|
|
|
|
let event = gst::event::FlushStart::builder()
|
|
.seqnum(seek_seqnum)
|
|
.build();
|
|
|
|
gst::debug!(CAT, imp: self, "Sending event {:?} upstream", event);
|
|
self.sinkpad.push_event(event);
|
|
|
|
let event = gst::event::FlushStart::builder()
|
|
.seqnum(seek_seqnum)
|
|
.build();
|
|
|
|
gst::debug!(CAT, imp: self, "Pushing event {:?}", event);
|
|
self.srcpad.push_event(event);
|
|
|
|
self.sinkpad.pause_task().unwrap();
|
|
|
|
let mut state = self.state.lock().unwrap();
|
|
let pull = state.pull.as_ref().unwrap();
|
|
|
|
if start_type == gst::SeekType::Set {
|
|
start = start.opt_min(pull.duration).or(start);
|
|
}
|
|
|
|
if stop_type == gst::SeekType::Set {
|
|
stop = stop.opt_min(pull.duration).or(stop);
|
|
}
|
|
|
|
state.seeking = true;
|
|
state.seek_seqnum = Some(seek_seqnum);
|
|
|
|
self.flush(&mut state);
|
|
|
|
let event = gst::event::FlushStop::builder(true)
|
|
.seqnum(seek_seqnum)
|
|
.build();
|
|
|
|
/* Drop our state while we push a serialized event upstream */
|
|
drop(state);
|
|
|
|
gst::debug!(CAT, imp: self, "Sending event {:?} upstream", event);
|
|
self.sinkpad.push_event(event);
|
|
|
|
state = self.state.lock().unwrap();
|
|
|
|
state
|
|
.segment
|
|
.do_seek(rate, flags, start_type, start, stop_type, stop);
|
|
|
|
match self.start_task() {
|
|
Err(error) => {
|
|
error.log();
|
|
false
|
|
}
|
|
_ => true,
|
|
}
|
|
}
|
|
|
|
fn src_event(&self, pad: &gst::Pad, event: gst::Event) -> bool {
|
|
use gst::EventView;
|
|
|
|
gst::log!(CAT, obj: pad, "Handling event {:?}", event);
|
|
match event.view() {
|
|
EventView::Seek(e) => self.perform_seek(e),
|
|
_ => pad.event_default(Some(&*self.instance()), event),
|
|
}
|
|
}
|
|
|
|
fn src_query(&self, pad: &gst::Pad, query: &mut gst::QueryRef) -> bool {
|
|
use gst::QueryViewMut;
|
|
|
|
gst::log!(CAT, obj: pad, "Handling query {:?}", query);
|
|
|
|
match query.view_mut() {
|
|
QueryViewMut::Seeking(q) => {
|
|
let state = self.state.lock().unwrap();
|
|
|
|
let fmt = q.format();
|
|
|
|
if fmt == gst::Format::Time {
|
|
if let Some(pull) = state.pull.as_ref() {
|
|
q.set(true, gst::ClockTime::ZERO, pull.duration);
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
QueryViewMut::Position(q) => {
|
|
// For Time answer ourselfs, otherwise forward
|
|
if q.format() == gst::Format::Time {
|
|
let state = self.state.lock().unwrap();
|
|
q.set(state.last_position);
|
|
true
|
|
} else {
|
|
self.sinkpad.peer_query(query)
|
|
}
|
|
}
|
|
QueryViewMut::Duration(q) => {
|
|
// For Time answer ourselfs, otherwise forward
|
|
let state = self.state.lock().unwrap();
|
|
if q.format() == gst::Format::Time {
|
|
if let Some(pull) = state.pull.as_ref() {
|
|
if pull.duration.is_some() {
|
|
q.set(state.pull.as_ref().unwrap().duration);
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
self.sinkpad.peer_query(query)
|
|
}
|
|
}
|
|
_ => pad.query_default(Some(&*self.instance()), query),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[glib::object_subclass]
|
|
impl ObjectSubclass for JsonGstParse {
|
|
const NAME: &'static str = "RsJsonGstParse";
|
|
type Type = super::JsonGstParse;
|
|
type ParentType = gst::Element;
|
|
|
|
fn with_class(klass: &Self::Class) -> Self {
|
|
let templ = klass.pad_template("sink").unwrap();
|
|
let sinkpad = gst::Pad::builder_with_template(&templ, Some("sink"))
|
|
.activate_function(|pad, parent| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| Err(gst::loggable_error!(CAT, "Panic activating sink pad")),
|
|
|parse| parse.sink_activate(pad),
|
|
)
|
|
})
|
|
.activatemode_function(|pad, parent, mode, active| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| {
|
|
Err(gst::loggable_error!(
|
|
CAT,
|
|
"Panic activating sink pad with mode"
|
|
))
|
|
},
|
|
|parse| parse.sink_activatemode(pad, mode, active),
|
|
)
|
|
})
|
|
.chain_function(|pad, parent, buffer| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| Err(gst::FlowError::Error),
|
|
|parse| parse.sink_chain(pad, buffer),
|
|
)
|
|
})
|
|
.event_function(|pad, parent, event| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| false,
|
|
|parse| parse.sink_event(pad, event),
|
|
)
|
|
})
|
|
.build();
|
|
|
|
let templ = klass.pad_template("src").unwrap();
|
|
let srcpad = gst::Pad::builder_with_template(&templ, Some("src"))
|
|
.event_function(|pad, parent, event| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| false,
|
|
|parse| parse.src_event(pad, event),
|
|
)
|
|
})
|
|
.query_function(|pad, parent, query| {
|
|
JsonGstParse::catch_panic_pad_function(
|
|
parent,
|
|
|| false,
|
|
|parse| parse.src_query(pad, query),
|
|
)
|
|
})
|
|
.build();
|
|
|
|
Self {
|
|
srcpad,
|
|
sinkpad,
|
|
state: Mutex::new(State::default()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ObjectImpl for JsonGstParse {
|
|
fn constructed(&self) {
|
|
self.parent_constructed();
|
|
|
|
let obj = self.instance();
|
|
obj.add_pad(&self.sinkpad).unwrap();
|
|
obj.add_pad(&self.srcpad).unwrap();
|
|
}
|
|
}
|
|
|
|
impl GstObjectImpl for JsonGstParse {}
|
|
|
|
impl ElementImpl for JsonGstParse {
|
|
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
|
|
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
|
|
gst::subclass::ElementMetadata::new(
|
|
"JSON GStreamer parser",
|
|
"Parser/JSON",
|
|
"Parses ndjson as output by jsongstenc",
|
|
"Mathieu Duponchelle <mathieu@centricular.com>",
|
|
)
|
|
});
|
|
|
|
Some(&*ELEMENT_METADATA)
|
|
}
|
|
|
|
fn pad_templates() -> &'static [gst::PadTemplate] {
|
|
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
|
|
let caps = gst::Caps::builder("application/x-json").build();
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
"src",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Always,
|
|
&caps,
|
|
)
|
|
.unwrap();
|
|
|
|
let caps = gst::Caps::new_any();
|
|
let sink_pad_template = gst::PadTemplate::new(
|
|
"sink",
|
|
gst::PadDirection::Sink,
|
|
gst::PadPresence::Always,
|
|
&caps,
|
|
)
|
|
.unwrap();
|
|
|
|
vec![src_pad_template, sink_pad_template]
|
|
});
|
|
|
|
PAD_TEMPLATES.as_ref()
|
|
}
|
|
|
|
fn change_state(
|
|
&self,
|
|
transition: gst::StateChange,
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
gst::trace!(CAT, imp: self, "Changing state {:?}", transition);
|
|
|
|
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(transition)
|
|
}
|
|
}
|