mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-06-08 01:09:27 +00:00
738 lines
23 KiB
Rust
738 lines
23 KiB
Rust
// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
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// Copyright (C) 2019-2020 François Laignel <fengalin@free.fr>
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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 futures::channel::mpsc;
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use futures::future::BoxFuture;
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use futures::lock::Mutex as FutMutex;
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use futures::prelude::*;
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use gst::glib;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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use gst::{gst_debug, gst_error, gst_log, gst_trace};
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use once_cell::sync::Lazy;
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use std::sync::Arc;
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use std::sync::Mutex as StdMutex;
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use std::time::Duration;
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use std::u32;
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use crate::runtime::prelude::*;
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use crate::runtime::{Context, PadSrc, PadSrcRef, PadSrcWeak, Task, TaskState};
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const DEFAULT_CONTEXT: &str = "";
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const DEFAULT_CONTEXT_WAIT: Duration = Duration::ZERO;
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const DEFAULT_CAPS: Option<gst::Caps> = None;
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const DEFAULT_MAX_BUFFERS: u32 = 10;
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const DEFAULT_DO_TIMESTAMP: bool = false;
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#[derive(Debug, Clone)]
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struct Settings {
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context: String,
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context_wait: Duration,
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caps: Option<gst::Caps>,
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max_buffers: u32,
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do_timestamp: bool,
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}
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impl Default for Settings {
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fn default() -> Self {
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Settings {
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context: DEFAULT_CONTEXT.into(),
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context_wait: DEFAULT_CONTEXT_WAIT,
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caps: DEFAULT_CAPS,
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max_buffers: DEFAULT_MAX_BUFFERS,
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do_timestamp: DEFAULT_DO_TIMESTAMP,
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}
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}
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}
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"ts-appsrc",
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gst::DebugColorFlags::empty(),
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Some("Thread-sharing app source"),
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)
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});
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#[derive(Debug)]
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enum StreamItem {
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Buffer(gst::Buffer),
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Event(gst::Event),
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}
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#[derive(Debug)]
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struct AppSrcPadHandlerState {
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need_initial_events: bool,
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need_segment: bool,
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caps: Option<gst::Caps>,
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}
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impl Default for AppSrcPadHandlerState {
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fn default() -> Self {
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AppSrcPadHandlerState {
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need_initial_events: true,
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need_segment: true,
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caps: None,
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}
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}
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}
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#[derive(Debug, Default)]
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struct AppSrcPadHandlerInner {
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state: FutMutex<AppSrcPadHandlerState>,
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configured_caps: StdMutex<Option<gst::Caps>>,
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}
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#[derive(Clone, Debug, Default)]
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struct AppSrcPadHandler(Arc<AppSrcPadHandlerInner>);
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impl AppSrcPadHandler {
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fn prepare(&self, caps: Option<gst::Caps>) {
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self.0
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.state
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.try_lock()
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.expect("State locked elsewhere")
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.caps = caps;
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}
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async fn reset_state(&self) {
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*self.0.state.lock().await = Default::default();
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}
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async fn set_need_segment(&self) {
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self.0.state.lock().await.need_segment = true;
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}
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async fn push_prelude(&self, pad: &PadSrcRef<'_>, _element: &super::AppSrc) {
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let mut state = self.0.state.lock().await;
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if state.need_initial_events {
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gst_debug!(CAT, obj: pad.gst_pad(), "Pushing initial events");
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let stream_id = format!("{:08x}{:08x}", rand::random::<u32>(), rand::random::<u32>());
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let stream_start_evt = gst::event::StreamStart::builder(&stream_id)
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.group_id(gst::GroupId::next())
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.build();
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pad.push_event(stream_start_evt).await;
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if let Some(ref caps) = state.caps {
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pad.push_event(gst::event::Caps::new(caps)).await;
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*self.0.configured_caps.lock().unwrap() = Some(caps.clone());
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}
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state.need_initial_events = false;
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}
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if state.need_segment {
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let segment_evt =
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gst::event::Segment::new(&gst::FormattedSegment::<gst::format::Time>::new());
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pad.push_event(segment_evt).await;
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state.need_segment = false;
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}
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}
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async fn push_item(
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&self,
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pad: &PadSrcRef<'_>,
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element: &super::AppSrc,
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item: StreamItem,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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gst_log!(CAT, obj: pad.gst_pad(), "Handling {:?}", item);
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self.push_prelude(pad, element).await;
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match item {
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StreamItem::Buffer(buffer) => {
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gst_log!(CAT, obj: pad.gst_pad(), "Forwarding {:?}", buffer);
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pad.push(buffer).await
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}
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StreamItem::Event(event) => {
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match event.view() {
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gst::EventView::Eos(_) => {
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// Let the caller push the event
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Err(gst::FlowError::Eos)
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}
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_ => {
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gst_log!(CAT, obj: pad.gst_pad(), "Forwarding {:?}", event);
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pad.push_event(event).await;
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Ok(gst::FlowSuccess::Ok)
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}
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}
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}
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}
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}
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}
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impl PadSrcHandler for AppSrcPadHandler {
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type ElementImpl = AppSrc;
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fn src_event(
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&self,
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pad: &PadSrcRef,
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appsrc: &AppSrc,
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_element: &gst::Element,
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event: gst::Event,
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) -> bool {
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use gst::EventView;
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gst_log!(CAT, obj: pad.gst_pad(), "Handling {:?}", event);
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let ret = match event.view() {
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EventView::FlushStart(..) => appsrc.task.flush_start().is_ok(),
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EventView::FlushStop(..) => appsrc.task.flush_stop().is_ok(),
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EventView::Reconfigure(..) => true,
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EventView::Latency(..) => true,
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_ => false,
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};
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if ret {
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gst_log!(CAT, obj: pad.gst_pad(), "Handled {:?}", event);
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} else {
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gst_log!(CAT, obj: pad.gst_pad(), "Didn't handle {:?}", event);
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}
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ret
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}
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fn src_query(
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&self,
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pad: &PadSrcRef,
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_appsrc: &AppSrc,
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_element: &gst::Element,
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query: &mut gst::QueryRef,
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) -> bool {
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use gst::QueryView;
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gst_log!(CAT, obj: pad.gst_pad(), "Handling {:?}", query);
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let ret = match query.view_mut() {
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QueryView::Latency(ref mut q) => {
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q.set(true, gst::ClockTime::ZERO, gst::ClockTime::NONE);
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true
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}
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QueryView::Scheduling(ref mut q) => {
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q.set(gst::SchedulingFlags::SEQUENTIAL, 1, -1, 0);
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q.add_scheduling_modes(&[gst::PadMode::Push]);
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true
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}
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QueryView::Caps(ref mut q) => {
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let caps = if let Some(caps) = self.0.configured_caps.lock().unwrap().as_ref() {
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q.filter()
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.map(|f| f.intersect_with_mode(caps, gst::CapsIntersectMode::First))
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.unwrap_or_else(|| caps.clone())
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} else {
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q.filter()
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.map(|f| f.to_owned())
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.unwrap_or_else(gst::Caps::new_any)
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};
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q.set_result(&caps);
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true
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}
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_ => false,
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};
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if ret {
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gst_log!(CAT, obj: pad.gst_pad(), "Handled {:?}", query);
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} else {
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gst_log!(CAT, obj: pad.gst_pad(), "Didn't handle {:?}", query);
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}
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ret
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}
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}
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#[derive(Debug)]
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struct AppSrcTask {
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element: super::AppSrc,
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src_pad: PadSrcWeak,
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src_pad_handler: AppSrcPadHandler,
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receiver: mpsc::Receiver<StreamItem>,
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}
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impl AppSrcTask {
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fn new(
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element: &super::AppSrc,
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src_pad: &PadSrc,
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src_pad_handler: &AppSrcPadHandler,
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receiver: mpsc::Receiver<StreamItem>,
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) -> Self {
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AppSrcTask {
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element: element.clone(),
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src_pad: src_pad.downgrade(),
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src_pad_handler: src_pad_handler.clone(),
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receiver,
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}
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}
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}
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impl AppSrcTask {
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fn flush(&mut self) {
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// Purge the channel
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while let Ok(Some(_item)) = self.receiver.try_next() {}
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}
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}
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impl TaskImpl for AppSrcTask {
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fn iterate(&mut self) -> BoxFuture<'_, Result<(), gst::FlowError>> {
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async move {
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let item = match self.receiver.next().await {
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Some(item) => item,
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None => {
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gst_error!(CAT, obj: &self.element, "SrcPad channel aborted");
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gst::element_error!(
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&self.element,
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gst::StreamError::Failed,
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("Internal data stream error"),
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["streaming stopped, reason: channel aborted"]
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);
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return Err(gst::FlowError::Flushing);
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}
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};
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let pad = self.src_pad.upgrade().expect("PadSrc no longer exists");
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let res = self
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.src_pad_handler
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.push_item(&pad, &self.element, item)
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.await;
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match res {
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Ok(_) => {
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gst_log!(CAT, obj: &self.element, "Successfully pushed item");
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}
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Err(gst::FlowError::Eos) => {
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gst_debug!(CAT, obj: &self.element, "EOS");
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pad.push_event(gst::event::Eos::new()).await;
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}
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Err(gst::FlowError::Flushing) => {
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gst_debug!(CAT, obj: &self.element, "Flushing");
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}
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Err(err) => {
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gst_error!(CAT, obj: &self.element, "Got error {}", err);
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gst::element_error!(
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&self.element,
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gst::StreamError::Failed,
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("Internal data stream error"),
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["streaming stopped, reason {}", err]
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);
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}
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}
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res.map(drop)
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}
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.boxed()
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}
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fn stop(&mut self) -> BoxFuture<'_, Result<(), gst::ErrorMessage>> {
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async move {
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gst_log!(CAT, obj: &self.element, "Stopping task");
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self.flush();
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self.src_pad_handler.reset_state().await;
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gst_log!(CAT, obj: &self.element, "Task stopped");
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Ok(())
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}
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.boxed()
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}
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fn flush_start(&mut self) -> BoxFuture<'_, Result<(), gst::ErrorMessage>> {
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async move {
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gst_log!(CAT, obj: &self.element, "Starting task flush");
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self.flush();
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self.src_pad_handler.set_need_segment().await;
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gst_log!(CAT, obj: &self.element, "Task flush started");
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Ok(())
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}
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.boxed()
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}
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}
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#[derive(Debug)]
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pub struct AppSrc {
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src_pad: PadSrc,
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src_pad_handler: AppSrcPadHandler,
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task: Task,
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sender: StdMutex<Option<mpsc::Sender<StreamItem>>>,
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settings: StdMutex<Settings>,
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}
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impl AppSrc {
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fn push_buffer(&self, element: &super::AppSrc, mut buffer: gst::Buffer) -> bool {
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let state = self.task.lock_state();
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if *state != TaskState::Started && *state != TaskState::Paused {
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gst_debug!(CAT, obj: element, "Rejecting buffer due to element state");
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return false;
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}
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let do_timestamp = self.settings.lock().unwrap().do_timestamp;
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if do_timestamp {
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if let Some(clock) = element.clock() {
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let base_time = element.base_time();
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let now = clock.time();
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let buffer = buffer.make_mut();
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buffer.set_dts(now.opt_checked_sub(base_time).ok().flatten());
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buffer.set_pts(None);
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} else {
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gst_error!(CAT, obj: element, "Don't have a clock yet");
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return false;
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}
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}
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match self
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.sender
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.lock()
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.unwrap()
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.as_mut()
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.unwrap()
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.try_send(StreamItem::Buffer(buffer))
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{
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Ok(_) => true,
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Err(err) => {
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gst_error!(CAT, obj: element, "Failed to queue buffer: {}", err);
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false
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}
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}
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}
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fn end_of_stream(&self, element: &super::AppSrc) -> bool {
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let mut sender = self.sender.lock().unwrap();
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let sender = match sender.as_mut() {
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Some(sender) => sender,
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None => return false,
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};
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match sender.try_send(StreamItem::Event(gst::event::Eos::new())) {
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Ok(_) => true,
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Err(err) => {
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gst_error!(CAT, obj: element, "Failed to queue EOS: {}", err);
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false
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}
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}
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}
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fn prepare(&self, element: &super::AppSrc) -> Result<(), gst::ErrorMessage> {
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let settings = self.settings.lock().unwrap();
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gst_debug!(CAT, obj: element, "Preparing");
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let context =
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Context::acquire(&settings.context, settings.context_wait).map_err(|err| {
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gst::error_msg!(
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gst::ResourceError::OpenRead,
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["Failed to acquire Context: {}", err]
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)
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})?;
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let max_buffers = settings.max_buffers.try_into().map_err(|err| {
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gst::error_msg!(
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gst::ResourceError::Settings,
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["Invalid max-buffers: {}, {}", settings.max_buffers, err]
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)
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})?;
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let (sender, receiver) = mpsc::channel(max_buffers);
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*self.sender.lock().unwrap() = Some(sender);
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self.src_pad_handler.prepare(settings.caps.clone());
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self.task
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.prepare(
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AppSrcTask::new(element, &self.src_pad, &self.src_pad_handler, receiver),
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context,
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)
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.map_err(|err| {
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gst::error_msg!(
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gst::ResourceError::OpenRead,
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["Error preparing Task: {:?}", err]
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)
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})?;
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gst_debug!(CAT, obj: element, "Prepared");
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Ok(())
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}
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fn unprepare(&self, element: &super::AppSrc) {
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gst_debug!(CAT, obj: element, "Unpreparing");
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*self.sender.lock().unwrap() = None;
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self.task.unprepare().unwrap();
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gst_debug!(CAT, obj: element, "Unprepared");
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}
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fn stop(&self, element: &super::AppSrc) -> Result<(), gst::ErrorMessage> {
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gst_debug!(CAT, obj: element, "Stopping");
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self.task.stop()?;
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gst_debug!(CAT, obj: element, "Stopped");
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Ok(())
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}
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fn start(&self, element: &super::AppSrc) -> Result<(), gst::ErrorMessage> {
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gst_debug!(CAT, obj: element, "Starting");
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self.task.start()?;
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gst_debug!(CAT, obj: element, "Started");
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Ok(())
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}
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fn pause(&self, element: &super::AppSrc) -> Result<(), gst::ErrorMessage> {
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gst_debug!(CAT, obj: element, "Pausing");
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self.task.pause()?;
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gst_debug!(CAT, obj: element, "Paused");
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Ok(())
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}
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}
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|
|
#[glib::object_subclass]
|
|
impl ObjectSubclass for AppSrc {
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const NAME: &'static str = "RsTsAppSrc";
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type Type = super::AppSrc;
|
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type ParentType = gst::Element;
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|
|
fn with_class(klass: &Self::Class) -> Self {
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let src_pad_handler = AppSrcPadHandler::default();
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|
|
Self {
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src_pad: PadSrc::new(
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gst::Pad::from_template(&klass.pad_template("src").unwrap(), Some("src")),
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src_pad_handler.clone(),
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|
),
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src_pad_handler,
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task: Task::default(),
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sender: StdMutex::new(None),
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settings: StdMutex::new(Settings::default()),
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}
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}
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}
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|
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impl ObjectImpl for AppSrc {
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|
fn properties() -> &'static [glib::ParamSpec] {
|
|
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
|
|
vec![
|
|
glib::ParamSpec::new_string(
|
|
"context",
|
|
"Context",
|
|
"Context name to share threads with",
|
|
Some(DEFAULT_CONTEXT),
|
|
glib::ParamFlags::READWRITE,
|
|
),
|
|
glib::ParamSpec::new_uint(
|
|
"context-wait",
|
|
"Context Wait",
|
|
"Throttle poll loop to run at most once every this many ms",
|
|
0,
|
|
1000,
|
|
DEFAULT_CONTEXT_WAIT.as_millis() as u32,
|
|
glib::ParamFlags::READWRITE,
|
|
),
|
|
glib::ParamSpec::new_uint(
|
|
"max-buffers",
|
|
"Max Buffers",
|
|
"Maximum number of buffers to queue up",
|
|
1,
|
|
u32::MAX,
|
|
DEFAULT_MAX_BUFFERS,
|
|
glib::ParamFlags::READWRITE,
|
|
),
|
|
glib::ParamSpec::new_boxed(
|
|
"caps",
|
|
"Caps",
|
|
"Caps to use",
|
|
gst::Caps::static_type(),
|
|
glib::ParamFlags::READWRITE,
|
|
),
|
|
glib::ParamSpec::new_boolean(
|
|
"do-timestamp",
|
|
"Do Timestamp",
|
|
"Timestamp buffers with the current running time on arrival",
|
|
DEFAULT_DO_TIMESTAMP,
|
|
glib::ParamFlags::READWRITE,
|
|
),
|
|
]
|
|
});
|
|
|
|
PROPERTIES.as_ref()
|
|
}
|
|
|
|
fn signals() -> &'static [glib::subclass::Signal] {
|
|
static SIGNALS: Lazy<Vec<glib::subclass::Signal>> = Lazy::new(|| {
|
|
vec![
|
|
glib::subclass::Signal::builder(
|
|
"push-buffer",
|
|
&[gst::Buffer::static_type().into()],
|
|
bool::static_type().into(),
|
|
)
|
|
.action()
|
|
.class_handler(|_, args| {
|
|
let element = args[0].get::<super::AppSrc>().expect("signal arg");
|
|
let buffer = args[1].get::<gst::Buffer>().expect("signal arg");
|
|
let appsrc = AppSrc::from_instance(&element);
|
|
|
|
Some(appsrc.push_buffer(&element, buffer).to_value())
|
|
})
|
|
.build(),
|
|
glib::subclass::Signal::builder("end-of-stream", &[], bool::static_type().into())
|
|
.action()
|
|
.class_handler(|_, args| {
|
|
let element = args[0].get::<super::AppSrc>().expect("signal arg");
|
|
let appsrc = AppSrc::from_instance(&element);
|
|
|
|
Some(appsrc.end_of_stream(&element).to_value())
|
|
})
|
|
.build(),
|
|
]
|
|
});
|
|
|
|
SIGNALS.as_ref()
|
|
}
|
|
|
|
fn set_property(
|
|
&self,
|
|
_obj: &Self::Type,
|
|
_id: usize,
|
|
value: &glib::Value,
|
|
pspec: &glib::ParamSpec,
|
|
) {
|
|
let mut settings = self.settings.lock().unwrap();
|
|
match pspec.name() {
|
|
"context" => {
|
|
settings.context = value
|
|
.get::<Option<String>>()
|
|
.expect("type checked upstream")
|
|
.unwrap_or_else(|| "".into());
|
|
}
|
|
"context-wait" => {
|
|
settings.context_wait = Duration::from_millis(
|
|
value.get::<u32>().expect("type checked upstream").into(),
|
|
);
|
|
}
|
|
"caps" => {
|
|
settings.caps = value.get().expect("type checked upstream");
|
|
}
|
|
"max-buffers" => {
|
|
settings.max_buffers = value.get().expect("type checked upstream");
|
|
}
|
|
"do-timestamp" => {
|
|
settings.do_timestamp = value.get().expect("type checked upstream");
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn property(&self, _obj: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
|
|
let settings = self.settings.lock().unwrap();
|
|
match pspec.name() {
|
|
"context" => settings.context.to_value(),
|
|
"context-wait" => (settings.context_wait.as_millis() as u32).to_value(),
|
|
"caps" => settings.caps.to_value(),
|
|
"max-buffers" => settings.max_buffers.to_value(),
|
|
"do-timestamp" => settings.do_timestamp.to_value(),
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn constructed(&self, obj: &Self::Type) {
|
|
self.parent_constructed(obj);
|
|
|
|
obj.add_pad(self.src_pad.gst_pad()).unwrap();
|
|
|
|
crate::set_element_flags(obj, gst::ElementFlags::SOURCE);
|
|
}
|
|
}
|
|
|
|
impl GstObjectImpl for AppSrc {}
|
|
|
|
impl ElementImpl for AppSrc {
|
|
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
|
|
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
|
|
gst::subclass::ElementMetadata::new(
|
|
"Thread-sharing app source",
|
|
"Source/Generic",
|
|
"Thread-sharing app source",
|
|
"Sebastian Dröge <sebastian@centricular.com>",
|
|
)
|
|
});
|
|
|
|
Some(&*ELEMENT_METADATA)
|
|
}
|
|
|
|
fn pad_templates() -> &'static [gst::PadTemplate] {
|
|
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
|
|
let caps = gst::Caps::new_any();
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
"src",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Always,
|
|
&caps,
|
|
)
|
|
.unwrap();
|
|
|
|
vec![src_pad_template]
|
|
});
|
|
|
|
PAD_TEMPLATES.as_ref()
|
|
}
|
|
|
|
fn change_state(
|
|
&self,
|
|
element: &Self::Type,
|
|
transition: gst::StateChange,
|
|
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
|
|
gst_trace!(CAT, obj: element, "Changing state {:?}", transition);
|
|
|
|
match transition {
|
|
gst::StateChange::NullToReady => {
|
|
self.prepare(element).map_err(|err| {
|
|
element.post_error_message(err);
|
|
gst::StateChangeError
|
|
})?;
|
|
}
|
|
gst::StateChange::PlayingToPaused => {
|
|
self.pause(element).map_err(|_| gst::StateChangeError)?;
|
|
}
|
|
gst::StateChange::ReadyToNull => {
|
|
self.unprepare(element);
|
|
}
|
|
_ => (),
|
|
}
|
|
|
|
let mut success = self.parent_change_state(element, transition)?;
|
|
|
|
match transition {
|
|
gst::StateChange::ReadyToPaused => {
|
|
success = gst::StateChangeSuccess::NoPreroll;
|
|
}
|
|
gst::StateChange::PausedToPlaying => {
|
|
self.start(element).map_err(|_| gst::StateChangeError)?;
|
|
}
|
|
gst::StateChange::PlayingToPaused => {
|
|
success = gst::StateChangeSuccess::NoPreroll;
|
|
}
|
|
gst::StateChange::PausedToReady => {
|
|
self.stop(element).map_err(|_| gst::StateChangeError)?;
|
|
}
|
|
_ => (),
|
|
}
|
|
|
|
Ok(success)
|
|
}
|
|
}
|