mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-12 21:32:39 +00:00
795 lines
24 KiB
Rust
795 lines
24 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::lock::Mutex as FutMutex;
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use futures::prelude::*;
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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 glib::{glib_object_impl, glib_object_subclass};
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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 gst::{gst_debug, gst_element_error, gst_error, gst_error_msg, gst_log, gst_trace};
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use lazy_static::lazy_static;
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use rand;
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use std::convert::TryInto;
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use std::sync::Arc;
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use std::sync::Mutex as StdMutex;
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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, Task};
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const DEFAULT_CONTEXT: &str = "";
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const DEFAULT_CONTEXT_WAIT: u32 = 0;
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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: u32,
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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 PROPERTIES: [subclass::Property; 5] = [
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subclass::Property("context", |name| {
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glib::ParamSpec::string(
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name,
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"Context",
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"Context name to share threads with",
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Some(DEFAULT_CONTEXT),
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("context-wait", |name| {
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glib::ParamSpec::uint(
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name,
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"Context Wait",
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"Throttle poll loop to run at most once every this many ms",
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0,
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1000,
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DEFAULT_CONTEXT_WAIT,
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("max-buffers", |name| {
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glib::ParamSpec::uint(
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name,
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"Max Buffers",
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"Maximum number of buffers to queue up",
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1,
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u32::MAX,
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DEFAULT_MAX_BUFFERS,
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("caps", |name| {
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glib::ParamSpec::boxed(
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name,
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"Caps",
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"Caps to use",
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gst::Caps::static_type(),
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glib::ParamFlags::READWRITE,
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)
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}),
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subclass::Property("do-timestamp", |name| {
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glib::ParamSpec::boolean(
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name,
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"Do Timestamp",
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"Timestamp buffers with the current running time on arrival",
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DEFAULT_DO_TIMESTAMP,
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glib::ParamFlags::READWRITE,
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)
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}),
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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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"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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fn reset(&self) {
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*self.0.state.try_lock().expect("State locked elsewhere") = Default::default();
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*self.0.configured_caps.lock().unwrap() = None;
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}
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fn set_need_segment(&self) {
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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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.need_segment = true;
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}
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async fn push_prelude(&self, pad: &PadSrcRef<'_>, _element: &gst::Element) {
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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::new_stream_start(&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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let caps_evt = gst::Event::new_caps(&caps).build();
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pad.push_event(caps_evt).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::new_segment(&gst::FormattedSegment::<gst::format::Time>::new()).build();
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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: &gst::Element,
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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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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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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(..) => {
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appsrc.flush_start(element);
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true
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}
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EventView::FlushStop(..) => {
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appsrc.flush_stop(element);
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true
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}
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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, 0.into(), gst::CLOCK_TIME_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.get_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.get_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, Eq, PartialEq)]
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enum AppSrcState {
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Paused,
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RejectBuffers,
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Started,
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}
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#[derive(Debug)]
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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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state: StdMutex<AppSrcState>,
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sender: StdMutex<Option<mpsc::Sender<StreamItem>>>,
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receiver: StdMutex<Option<Arc<FutMutex<mpsc::Receiver<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: &gst::Element, mut buffer: gst::Buffer) -> bool {
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let state = self.state.lock().unwrap();
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if *state == AppSrcState::RejectBuffers {
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gst_debug!(CAT, obj: element, "Rejecting buffer due to pad 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.get_clock() {
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let base_time = element.get_base_time();
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let now = clock.get_time();
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let buffer = buffer.make_mut();
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buffer.set_dts(now - base_time);
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buffer.set_pts(gst::CLOCK_TIME_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: &gst::Element) -> 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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let eos = StreamItem::Event(gst::Event::new_eos().build());
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match sender.try_send(eos) {
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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: &gst::Element) -> 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.receiver.lock().unwrap() = Some(Arc::new(FutMutex::new(receiver)));
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self.task.prepare(context).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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self.src_pad_handler.prepare(settings.caps.clone());
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self.src_pad.prepare(&self.src_pad_handler);
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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: &gst::Element) -> Result<(), ()> {
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gst_debug!(CAT, obj: element, "Unpreparing");
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*self.sender.lock().unwrap() = None;
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*self.receiver.lock().unwrap() = None;
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self.task.unprepare().unwrap();
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self.src_pad.unprepare();
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gst_debug!(CAT, obj: element, "Unprepared");
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Ok(())
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}
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fn stop(&self, element: &gst::Element) -> Result<(), ()> {
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let mut state = self.state.lock().unwrap();
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gst_debug!(CAT, obj: element, "Stopping");
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self.flush(element);
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self.src_pad_handler.reset();
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*state = AppSrcState::RejectBuffers;
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gst_debug!(CAT, obj: element, "Stopped");
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Ok(())
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}
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fn flush(&self, element: &gst::Element) {
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gst_log!(CAT, obj: element, "Flushing");
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self.task.stop();
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let receiver = self.receiver.lock().unwrap();
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let mut receiver = receiver
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.as_ref()
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.unwrap()
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.try_lock()
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.expect("receiver locked elsewhere");
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// Purge the channel
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loop {
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match receiver.try_next() {
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Ok(Some(_item)) => {
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gst_log!(CAT, obj: element, "Dropping pending item");
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}
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Err(_) => {
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gst_log!(CAT, obj: element, "No more pending item");
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break;
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}
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Ok(None) => {
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panic!("Channel sender dropped");
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}
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}
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}
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self.src_pad_handler.set_need_segment();
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gst_log!(CAT, obj: element, "Flushed");
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}
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fn start(&self, element: &gst::Element) -> Result<(), ()> {
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let mut state = self.state.lock().unwrap();
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if *state == AppSrcState::Started {
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gst_debug!(CAT, obj: element, "Already started");
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return Ok(());
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}
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gst_debug!(CAT, obj: element, "Starting");
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self.start_task(element);
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*state = AppSrcState::Started;
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gst_debug!(CAT, obj: element, "Started");
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Ok(())
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}
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fn start_task(&self, element: &gst::Element) {
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let src_pad_handler = self.src_pad_handler.clone();
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let pad_weak = self.src_pad.downgrade();
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let element = element.clone();
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let receiver = Arc::clone(self.receiver.lock().unwrap().as_ref().expect("No receiver"));
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self.task.start(move || {
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let src_pad_handler = src_pad_handler.clone();
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let pad_weak = pad_weak.clone();
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let element = element.clone();
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let receiver = Arc::clone(&receiver);
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async move {
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let item = receiver.lock().await.next().await;
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|
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let pad = pad_weak.upgrade().expect("PadSrc no longer exists");
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|
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let item = match item {
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Some(item) => item,
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None => {
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gst_log!(CAT, obj: pad.gst_pad(), "SrcPad channel aborted");
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return glib::Continue(false);
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}
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};
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|
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match src_pad_handler.push_item(&pad, &element, item).await {
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Ok(_) => {
|
|
gst_log!(CAT, obj: pad.gst_pad(), "Successfully pushed item");
|
|
glib::Continue(true)
|
|
}
|
|
Err(gst::FlowError::Eos) => {
|
|
gst_debug!(CAT, obj: pad.gst_pad(), "EOS");
|
|
let eos = gst::Event::new_eos().build();
|
|
pad.push_event(eos).await;
|
|
glib::Continue(false)
|
|
}
|
|
Err(gst::FlowError::Flushing) => {
|
|
gst_debug!(CAT, obj: pad.gst_pad(), "Flushing");
|
|
glib::Continue(false)
|
|
}
|
|
Err(err) => {
|
|
gst_error!(CAT, obj: pad.gst_pad(), "Got error {}", err);
|
|
gst_element_error!(
|
|
&element,
|
|
gst::StreamError::Failed,
|
|
("Internal data stream error"),
|
|
["streaming stopped, reason {}", err]
|
|
);
|
|
glib::Continue(false)
|
|
}
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
fn flush_stop(&self, element: &gst::Element) {
|
|
let mut state = self.state.lock().unwrap();
|
|
if *state == AppSrcState::Started {
|
|
gst_debug!(CAT, obj: element, "Already started");
|
|
return;
|
|
}
|
|
|
|
gst_debug!(CAT, obj: element, "Stopping Flush");
|
|
|
|
self.flush(element);
|
|
self.start_task(element);
|
|
*state = AppSrcState::Started;
|
|
|
|
gst_debug!(CAT, obj: element, "Flush Stopped");
|
|
}
|
|
|
|
fn flush_start(&self, element: &gst::Element) {
|
|
let mut state = self.state.lock().unwrap();
|
|
gst_debug!(CAT, obj: element, "Starting Flush");
|
|
|
|
self.task.cancel();
|
|
*state = AppSrcState::RejectBuffers;
|
|
|
|
gst_debug!(CAT, obj: element, "Flush Started");
|
|
}
|
|
|
|
fn pause(&self, element: &gst::Element) -> Result<(), ()> {
|
|
let mut state = self.state.lock().unwrap();
|
|
gst_debug!(CAT, obj: element, "Pausing");
|
|
|
|
self.task.pause();
|
|
*state = AppSrcState::Paused;
|
|
|
|
gst_debug!(CAT, obj: element, "Paused");
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl ObjectSubclass for AppSrc {
|
|
const NAME: &'static str = "RsTsAppSrc";
|
|
type ParentType = gst::Element;
|
|
type Instance = gst::subclass::ElementInstanceStruct<Self>;
|
|
type Class = subclass::simple::ClassStruct<Self>;
|
|
|
|
glib_object_subclass!();
|
|
|
|
fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
|
|
klass.set_metadata(
|
|
"Thread-sharing app source",
|
|
"Source/Generic",
|
|
"Thread-sharing app source",
|
|
"Sebastian Dröge <sebastian@centricular.com>",
|
|
);
|
|
|
|
let caps = gst::Caps::new_any();
|
|
|
|
let src_pad_template = gst::PadTemplate::new(
|
|
"src",
|
|
gst::PadDirection::Src,
|
|
gst::PadPresence::Always,
|
|
&caps,
|
|
)
|
|
.unwrap();
|
|
klass.add_pad_template(src_pad_template);
|
|
|
|
klass.install_properties(&PROPERTIES);
|
|
|
|
klass.add_signal_with_class_handler(
|
|
"push-buffer",
|
|
glib::SignalFlags::RUN_LAST | glib::SignalFlags::ACTION,
|
|
&[gst::Buffer::static_type()],
|
|
bool::static_type(),
|
|
|_, args| {
|
|
let element = args[0]
|
|
.get::<gst::Element>()
|
|
.expect("signal arg")
|
|
.expect("missing signal arg");
|
|
let buffer = args[1]
|
|
.get::<gst::Buffer>()
|
|
.expect("signal arg")
|
|
.expect("missing signal arg");
|
|
let appsrc = Self::from_instance(&element);
|
|
|
|
Some(appsrc.push_buffer(&element, buffer).to_value())
|
|
},
|
|
);
|
|
|
|
klass.add_signal_with_class_handler(
|
|
"end-of-stream",
|
|
glib::SignalFlags::RUN_LAST | glib::SignalFlags::ACTION,
|
|
&[],
|
|
bool::static_type(),
|
|
|_, args| {
|
|
let element = args[0]
|
|
.get::<gst::Element>()
|
|
.expect("signal arg")
|
|
.expect("missing signal arg");
|
|
let appsrc = Self::from_instance(&element);
|
|
Some(appsrc.end_of_stream(&element).to_value())
|
|
},
|
|
);
|
|
}
|
|
|
|
fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
|
|
Self {
|
|
src_pad: PadSrc::new(gst::Pad::new_from_template(
|
|
&klass.get_pad_template("src").unwrap(),
|
|
Some("src"),
|
|
)),
|
|
src_pad_handler: AppSrcPadHandler::default(),
|
|
task: Task::default(),
|
|
state: StdMutex::new(AppSrcState::RejectBuffers),
|
|
sender: StdMutex::new(None),
|
|
receiver: StdMutex::new(None),
|
|
settings: StdMutex::new(Settings::default()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ObjectImpl for AppSrc {
|
|
glib_object_impl!();
|
|
|
|
fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
|
|
let prop = &PROPERTIES[id];
|
|
|
|
let mut settings = self.settings.lock().unwrap();
|
|
match *prop {
|
|
subclass::Property("context", ..) => {
|
|
settings.context = value
|
|
.get()
|
|
.expect("type checked upstream")
|
|
.unwrap_or_else(|| "".into());
|
|
}
|
|
subclass::Property("context-wait", ..) => {
|
|
settings.context_wait = value.get_some().expect("type checked upstream");
|
|
}
|
|
subclass::Property("caps", ..) => {
|
|
settings.caps = value.get().expect("type checked upstream");
|
|
}
|
|
subclass::Property("max-buffers", ..) => {
|
|
settings.max_buffers = value.get_some().expect("type checked upstream");
|
|
}
|
|
subclass::Property("do-timestamp", ..) => {
|
|
settings.do_timestamp = value.get_some().expect("type checked upstream");
|
|
}
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
|
|
let prop = &PROPERTIES[id];
|
|
|
|
let settings = self.settings.lock().unwrap();
|
|
match *prop {
|
|
subclass::Property("context", ..) => Ok(settings.context.to_value()),
|
|
subclass::Property("context-wait", ..) => Ok(settings.context_wait.to_value()),
|
|
subclass::Property("caps", ..) => Ok(settings.caps.to_value()),
|
|
subclass::Property("max-buffers", ..) => Ok(settings.max_buffers.to_value()),
|
|
subclass::Property("do-timestamp", ..) => Ok(settings.do_timestamp.to_value()),
|
|
_ => unimplemented!(),
|
|
}
|
|
}
|
|
|
|
fn constructed(&self, obj: &glib::Object) {
|
|
self.parent_constructed(obj);
|
|
|
|
let element = obj.downcast_ref::<gst::Element>().unwrap();
|
|
element.add_pad(self.src_pad.gst_pad()).unwrap();
|
|
|
|
super::set_element_flags(element, gst::ElementFlags::SOURCE);
|
|
}
|
|
}
|
|
|
|
impl ElementImpl for AppSrc {
|
|
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::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).map_err(|_| gst::StateChangeError)?;
|
|
}
|
|
_ => (),
|
|
}
|
|
|
|
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)
|
|
}
|
|
}
|
|
|
|
pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
|
|
gst::Element::register(
|
|
Some(plugin),
|
|
"ts-appsrc",
|
|
gst::Rank::None,
|
|
AppSrc::get_type(),
|
|
)
|
|
}
|