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|
// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2018 LEE Dongjun <redongjun@gmail.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
// Boston, MA 02110-1335, USA.
//
// SPDX-License-Identifier: LGPL-2.1-or-later
use futures::future::BoxFuture;
use futures::prelude::*;
use gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
use once_cell::sync::Lazy;
use std::io;
use std::net::{IpAddr, SocketAddr, TcpStream};
use std::sync::Mutex;
use std::time::Duration;
use std::u16;
use std::u32;
use crate::runtime::prelude::*;
use crate::runtime::task;
use crate::runtime::{Context, PadSrc, PadSrcRef, Task, TaskState};
use crate::runtime::Async;
use crate::socket::{Socket, SocketError, SocketRead};
const DEFAULT_HOST: Option<&str> = Some("127.0.0.1");
const DEFAULT_PORT: i32 = 4953;
const DEFAULT_CAPS: Option<gst::Caps> = None;
const DEFAULT_BLOCKSIZE: u32 = 4096;
const DEFAULT_CONTEXT: &str = "";
const DEFAULT_CONTEXT_WAIT: Duration = Duration::ZERO;
#[derive(Debug, Clone)]
struct Settings {
host: Option<String>,
port: i32,
caps: Option<gst::Caps>,
blocksize: u32,
context: String,
context_wait: Duration,
}
impl Default for Settings {
fn default() -> Self {
Settings {
host: DEFAULT_HOST.map(Into::into),
port: DEFAULT_PORT,
caps: DEFAULT_CAPS,
blocksize: DEFAULT_BLOCKSIZE,
context: DEFAULT_CONTEXT.into(),
context_wait: DEFAULT_CONTEXT_WAIT,
}
}
}
struct TcpClientReader(Async<TcpStream>);
impl TcpClientReader {
pub fn new(socket: Async<TcpStream>) -> Self {
TcpClientReader(socket)
}
}
impl SocketRead for TcpClientReader {
const DO_TIMESTAMP: bool = false;
fn read<'buf>(
&'buf mut self,
buffer: &'buf mut [u8],
) -> BoxFuture<'buf, io::Result<(usize, Option<std::net::SocketAddr>)>> {
async move { self.0.read(buffer).await.map(|read_size| (read_size, None)) }.boxed()
}
}
#[derive(Clone, Debug)]
struct TcpClientSrcPadHandler;
impl PadSrcHandler for TcpClientSrcPadHandler {
type ElementImpl = TcpClientSrc;
fn src_event(&self, pad: &PadSrcRef, imp: &TcpClientSrc, event: gst::Event) -> bool {
gst::log!(CAT, obj: pad.gst_pad(), "Handling {:?}", event);
use gst::EventView;
let ret = match event.view() {
EventView::FlushStart(..) => imp.task.flush_start().await_maybe_on_context().is_ok(),
EventView::FlushStop(..) => imp.task.flush_stop().await_maybe_on_context().is_ok(),
EventView::Reconfigure(..) => true,
EventView::Latency(..) => true,
_ => false,
};
if ret {
gst::log!(CAT, obj: pad.gst_pad(), "Handled {:?}", event);
} else {
gst::log!(CAT, obj: pad.gst_pad(), "Didn't handle {:?}", event);
}
ret
}
fn src_query(&self, pad: &PadSrcRef, imp: &TcpClientSrc, query: &mut gst::QueryRef) -> bool {
gst::log!(CAT, obj: pad.gst_pad(), "Handling {:?}", query);
use gst::QueryViewMut;
let ret = match query.view_mut() {
QueryViewMut::Latency(q) => {
q.set(false, gst::ClockTime::ZERO, gst::ClockTime::NONE);
true
}
QueryViewMut::Scheduling(q) => {
q.set(gst::SchedulingFlags::SEQUENTIAL, 1, -1, 0);
q.add_scheduling_modes(&[gst::PadMode::Push]);
true
}
QueryViewMut::Caps(q) => {
let caps = if let Some(caps) = imp.configured_caps.lock().unwrap().as_ref() {
q.filter()
.map(|f| f.intersect_with_mode(caps, gst::CapsIntersectMode::First))
.unwrap_or_else(|| caps.clone())
} else {
q.filter()
.map(|f| f.to_owned())
.unwrap_or_else(gst::Caps::new_any)
};
q.set_result(&caps);
true
}
_ => false,
};
if ret {
gst::log!(CAT, obj: pad.gst_pad(), "Handled {:?}", query);
} else {
gst::log!(CAT, obj: pad.gst_pad(), "Didn't handle {:?}", query);
}
ret
}
}
struct TcpClientSrcTask {
element: super::TcpClientSrc,
saddr: SocketAddr,
buffer_pool: Option<gst::BufferPool>,
socket: Option<Socket<TcpClientReader>>,
need_initial_events: bool,
need_segment: bool,
}
impl TcpClientSrcTask {
fn new(element: super::TcpClientSrc, saddr: SocketAddr, buffer_pool: gst::BufferPool) -> Self {
TcpClientSrcTask {
element,
saddr,
buffer_pool: Some(buffer_pool),
socket: None,
need_initial_events: true,
need_segment: true,
}
}
async fn push_buffer(
&mut self,
buffer: gst::Buffer,
) -> Result<gst::FlowSuccess, gst::FlowError> {
gst::log!(CAT, obj: &self.element, "Handling {:?}", buffer);
let tcpclientsrc = self.element.imp();
if self.need_initial_events {
gst::debug!(CAT, obj: &self.element, "Pushing initial events");
let stream_id = format!("{:08x}{:08x}", rand::random::<u32>(), rand::random::<u32>());
let stream_start_evt = gst::event::StreamStart::builder(&stream_id)
.group_id(gst::GroupId::next())
.build();
tcpclientsrc.src_pad.push_event(stream_start_evt).await;
let caps = tcpclientsrc.settings.lock().unwrap().caps.clone();
if let Some(caps) = caps {
tcpclientsrc
.src_pad
.push_event(gst::event::Caps::new(&caps))
.await;
*tcpclientsrc.configured_caps.lock().unwrap() = Some(caps);
}
self.need_initial_events = false;
}
if self.need_segment {
let segment_evt =
gst::event::Segment::new(&gst::FormattedSegment::<gst::format::Time>::new());
tcpclientsrc.src_pad.push_event(segment_evt).await;
self.need_segment = false;
}
if buffer.size() == 0 {
tcpclientsrc
.src_pad
.push_event(gst::event::Eos::new())
.await;
return Ok(gst::FlowSuccess::Ok);
}
let res = tcpclientsrc.src_pad.push(buffer).await;
match res {
Ok(_) => {
gst::log!(CAT, obj: &self.element, "Successfully pushed buffer");
}
Err(gst::FlowError::Flushing) => {
gst::debug!(CAT, obj: &self.element, "Flushing");
}
Err(gst::FlowError::Eos) => {
gst::debug!(CAT, obj: &self.element, "EOS");
tcpclientsrc
.src_pad
.push_event(gst::event::Eos::new())
.await;
}
Err(err) => {
gst::error!(CAT, obj: &self.element, "Got error {}", err);
gst::element_error!(
self.element,
gst::StreamError::Failed,
("Internal data stream error"),
["streaming stopped, reason {}", err]
);
}
}
res
}
}
impl TaskImpl for TcpClientSrcTask {
type Item = gst::Buffer;
fn prepare(&mut self) -> BoxFuture<'_, Result<(), gst::ErrorMessage>> {
async move {
gst::log!(CAT, obj: &self.element, "Preparing task connecting to {:?}", self.saddr);
let socket = Async::<TcpStream>::connect(self.saddr)
.await
.map_err(|err| {
gst::error_msg!(
gst::ResourceError::OpenRead,
["Failed to connect to {:?}: {:?}", self.saddr, err]
)
})?;
self.socket = Some(
Socket::try_new(
self.element.clone().upcast(),
self.buffer_pool.take().unwrap(),
TcpClientReader::new(socket),
)
.map_err(|err| {
gst::error_msg!(
gst::ResourceError::OpenRead,
["Failed to prepare socket {:?}", err]
)
})?,
);
gst::log!(CAT, obj: &self.element, "Task prepared");
Ok(())
}
.boxed()
}
fn handle_action_error(
&mut self,
trigger: task::Trigger,
state: TaskState,
err: gst::ErrorMessage,
) -> BoxFuture<'_, task::Trigger> {
async move {
match trigger {
task::Trigger::Prepare => {
gst::error!(CAT, "Task preparation failed: {:?}", err);
self.element.post_error_message(err);
task::Trigger::Error
}
other => unreachable!("Action error for {:?} in state {:?}", other, state),
}
}
.boxed()
}
fn try_next(&mut self) -> BoxFuture<'_, Result<gst::Buffer, gst::FlowError>> {
async move {
self.socket
.as_mut()
.unwrap()
.try_next()
.await
.map(|(buffer, _saddr)| buffer)
.map_err(|err| {
gst::error!(CAT, obj: &self.element, "Got error {:?}", err);
match err {
SocketError::Gst(err) => {
gst::element_error!(
self.element,
gst::StreamError::Failed,
("Internal data stream error"),
["streaming stopped, reason {}", err]
);
}
SocketError::Io(err) => {
gst::element_error!(
self.element,
gst::StreamError::Failed,
("I/O error"),
["streaming stopped, I/O error {}", err]
);
}
}
gst::FlowError::Error
})
}
.boxed()
}
fn handle_item(&mut self, buffer: gst::Buffer) -> BoxFuture<'_, Result<(), gst::FlowError>> {
self.push_buffer(buffer).map_ok(drop).boxed()
}
fn stop(&mut self) -> BoxFuture<'_, Result<(), gst::ErrorMessage>> {
async move {
gst::log!(CAT, obj: &self.element, "Stopping task");
self.need_initial_events = true;
gst::log!(CAT, obj: &self.element, "Task stopped");
Ok(())
}
.boxed()
}
fn flush_stop(&mut self) -> BoxFuture<'_, Result<(), gst::ErrorMessage>> {
async move {
gst::log!(CAT, obj: &self.element, "Stopping task flush");
self.need_initial_events = true;
gst::log!(CAT, obj: &self.element, "Task flush stopped");
Ok(())
}
.boxed()
}
}
pub struct TcpClientSrc {
src_pad: PadSrc,
task: Task,
configured_caps: Mutex<Option<gst::Caps>>,
settings: Mutex<Settings>,
}
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"ts-tcpclientsrc",
gst::DebugColorFlags::empty(),
Some("Thread-sharing TCP Client source"),
)
});
impl TcpClientSrc {
fn prepare(&self) -> Result<(), gst::ErrorMessage> {
gst::debug!(CAT, imp: self, "Preparing");
let settings = self.settings.lock().unwrap().clone();
let context =
Context::acquire(&settings.context, settings.context_wait).map_err(|err| {
gst::error_msg!(
gst::ResourceError::OpenRead,
["Failed to acquire Context: {}", err]
)
})?;
*self.configured_caps.lock().unwrap() = None;
let host: IpAddr = match settings.host {
None => {
return Err(gst::error_msg!(
gst::ResourceError::Settings,
["No host set"]
));
}
Some(ref host) => match host.parse() {
Err(err) => {
return Err(gst::error_msg!(
gst::ResourceError::Settings,
["Invalid host '{}' set: {}", host, err]
));
}
Ok(host) => host,
},
};
let port = settings.port;
let buffer_pool = gst::BufferPool::new();
let mut config = buffer_pool.config();
config.set_params(None, settings.blocksize, 0, 0);
buffer_pool.set_config(config).map_err(|_| {
gst::error_msg!(
gst::ResourceError::Settings,
["Failed to configure buffer pool"]
)
})?;
let saddr = SocketAddr::new(host, port as u16);
// Don't block on `prepare` as the socket connection takes time.
// This will be performed in the background and we'll block on
// `start` which will also ensure `prepare` completed successfully.
let _ = self
.task
.prepare(
TcpClientSrcTask::new(self.instance().clone(), saddr, buffer_pool),
context,
)
.check()?;
gst::debug!(CAT, imp: self, "Preparing asynchronously");
Ok(())
}
fn unprepare(&self) {
gst::debug!(CAT, imp: self, "Unpreparing");
self.task.unprepare().block_on().unwrap();
gst::debug!(CAT, imp: self, "Unprepared");
}
fn stop(&self) -> Result<(), gst::ErrorMessage> {
gst::debug!(CAT, imp: self, "Stopping");
self.task.stop().block_on()?;
gst::debug!(CAT, imp: self, "Stopped");
Ok(())
}
fn start(&self) -> Result<(), gst::ErrorMessage> {
gst::debug!(CAT, imp: self, "Starting");
self.task.start().block_on()?;
gst::debug!(CAT, imp: self, "Started");
Ok(())
}
fn pause(&self) -> Result<(), gst::ErrorMessage> {
gst::debug!(CAT, imp: self, "Pausing");
self.task.pause().block_on()?;
gst::debug!(CAT, imp: self, "Paused");
Ok(())
}
}
#[glib::object_subclass]
impl ObjectSubclass for TcpClientSrc {
const NAME: &'static str = "RsTsTcpClientSrc";
type Type = super::TcpClientSrc;
type ParentType = gst::Element;
fn with_class(klass: &Self::Class) -> Self {
Self {
src_pad: PadSrc::new(
gst::Pad::from_template(&klass.pad_template("src").unwrap(), Some("src")),
TcpClientSrcPadHandler,
),
task: Task::default(),
configured_caps: Default::default(),
settings: Default::default(),
}
}
}
impl ObjectImpl for TcpClientSrc {
fn properties() -> &'static [glib::ParamSpec] {
static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
vec![
glib::ParamSpecString::builder("context")
.nick("Context")
.blurb("Context name to share threads with")
.default_value(Some(DEFAULT_CONTEXT))
.build(),
glib::ParamSpecUInt::builder("context-wait")
.nick("Context Wait")
.blurb("Throttle poll loop to run at most once every this many ms")
.maximum(1000)
.default_value(DEFAULT_CONTEXT_WAIT.as_millis() as u32)
.build(),
glib::ParamSpecString::builder("host")
.nick("Host")
.blurb("The host IP address to receive packets from")
.default_value(DEFAULT_HOST)
.build(),
glib::ParamSpecInt::builder("port")
.nick("Port")
.blurb("Port to receive packets from")
.minimum(0)
.maximum(u16::MAX as i32)
.default_value(DEFAULT_PORT)
.build(),
glib::ParamSpecBoxed::builder::<gst::Caps>("caps")
.nick("Caps")
.blurb("Caps to use")
.build(),
glib::ParamSpecUInt::builder("blocksize")
.nick("Blocksize")
.blurb("Size in bytes to read per buffer (-1 = default)")
.default_value(DEFAULT_BLOCKSIZE)
.build(),
]
});
PROPERTIES.as_ref()
}
fn set_property(&self, _id: usize, value: &glib::Value, pspec: &glib::ParamSpec) {
let mut settings = self.settings.lock().unwrap();
match pspec.name() {
"host" => {
settings.host = value.get().expect("type checked upstream");
}
"port" => {
settings.port = value.get().expect("type checked upstream");
}
"caps" => {
settings.caps = value.get().expect("type checked upstream");
}
"blocksize" => {
settings.blocksize = value.get().expect("type checked upstream");
}
"context" => {
settings.context = value
.get::<Option<String>>()
.expect("type checked upstream")
.unwrap_or_else(|| DEFAULT_CONTEXT.into());
}
"context-wait" => {
settings.context_wait = Duration::from_millis(
value.get::<u32>().expect("type checked upstream").into(),
);
}
_ => unimplemented!(),
}
}
fn property(&self, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
let settings = self.settings.lock().unwrap();
match pspec.name() {
"host" => settings.host.to_value(),
"port" => settings.port.to_value(),
"caps" => settings.caps.to_value(),
"blocksize" => settings.blocksize.to_value(),
"context" => settings.context.to_value(),
"context-wait" => (settings.context_wait.as_millis() as u32).to_value(),
_ => unimplemented!(),
}
}
fn constructed(&self) {
self.parent_constructed();
let obj = self.instance();
obj.add_pad(self.src_pad.gst_pad()).unwrap();
obj.set_element_flags(gst::ElementFlags::SOURCE);
}
}
impl GstObjectImpl for TcpClientSrc {}
impl ElementImpl for TcpClientSrc {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"Thread-sharing TCP client source",
"Source/Network",
"Receives data over the network via TCP",
"Sebastian Dröge <sebastian@centricular.com>, LEE Dongjun <redongjun@gmail.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,
transition: gst::StateChange,
) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
gst::trace!(CAT, imp: self, "Changing state {:?}", transition);
match transition {
gst::StateChange::NullToReady => {
self.prepare().map_err(|err| {
self.post_error_message(err);
gst::StateChangeError
})?;
}
gst::StateChange::PlayingToPaused => {
self.pause().map_err(|_| gst::StateChangeError)?;
}
gst::StateChange::ReadyToNull => {
self.unprepare();
}
_ => (),
}
let mut success = self.parent_change_state(transition)?;
match transition {
gst::StateChange::ReadyToPaused => {
success = gst::StateChangeSuccess::NoPreroll;
}
gst::StateChange::PausedToPlaying => {
self.start().map_err(|_| gst::StateChangeError)?;
}
gst::StateChange::PlayingToPaused => {
success = gst::StateChangeSuccess::NoPreroll;
}
gst::StateChange::PausedToReady => {
self.stop().map_err(|_| gst::StateChangeError)?;
}
_ => (),
}
Ok(success)
}
}
|