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Receiving video content

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This commit is contained in:
Rafael Caricio 2021-05-08 21:05:13 +02:00
parent 102523f435
commit 2e9e98f8f6
Signed by: rafaelcaricio
GPG key ID: 3C86DBCE8E93C947
4 changed files with 341 additions and 27 deletions
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19
src/data.rs Normal file
View file

@ -0,0 +1,19 @@
use bytes::Bytes;
use rml_rtmp::sessions::StreamMetadata;
pub enum RtmpInput {
Media(Media),
Metadata(StreamMetadata),
}
pub struct Media {
pub media_type: MediaType,
pub data: Bytes,
pub timestamp: u32,
pub can_be_dropped: bool,
}
pub enum MediaType {
Video,
Audio,
}

287
src/imp.rs
View file

@ -1,15 +1,20 @@
use crate::server::Server;
use bytes::Bytes;
use crate::connection::{Connection, ConnectionError, ReadResult};
use crate::data::{MediaType, RtmpInput};
use crate::server::{Server, ServerResult};
use glib::subclass;
use glib::subclass::prelude::*;
use gst::prelude::*;
use gst::subclass::prelude::*;
use gst::{gst_debug, gst_error, gst_info, gst_log};
use gst::{gst_debug, gst_trace, gst_info};
use gst_base::prelude::*;
use gst_base::subclass::prelude::*;
use once_cell::sync::Lazy;
use slab::Slab;
use std::collections::HashSet;
use std::net::{TcpListener, TcpStream};
use std::sync::mpsc::{channel, Receiver, Sender, TryRecvError};
use std::sync::Mutex;
use std::u32;
use std::{thread, u32};
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
@ -26,6 +31,7 @@ const DEFAULT_PORT: u32 = 5000;
struct Settings {
address: String,
port: u32,
stream_key: Option<String>,
}
impl Default for Settings {
@ -33,11 +39,12 @@ impl Default for Settings {
Settings {
address: DEFAULT_ADDRESS.into(),
port: DEFAULT_PORT,
stream_key: None,
}
}
}
static PROPERTIES: [subclass::Property; 2] = [
static PROPERTIES: [subclass::Property; 3] = [
subclass::Property("address", |name| {
glib::ParamSpec::string(
name,
@ -58,12 +65,26 @@ static PROPERTIES: [subclass::Property; 2] = [
glib::ParamFlags::READWRITE,
)
}),
subclass::Property("stream_key", |name| {
glib::ParamSpec::string(
name,
"Stream Key",
"The stream key to expect content to be published",
DEFAULT_ADDRESS.into(),
glib::ParamFlags::READWRITE,
)
}),
];
#[derive(Debug)]
enum State {
Stopped,
Started { stream_key: String },
Started {
source: Receiver<RtmpInput>,
position: u64,
video_caps: Option<gst::Caps>,
audio_caps: Option<gst::Caps>,
},
}
impl Default for State {
@ -156,6 +177,7 @@ impl ObjectImpl for RtmpSvrSrc {
fn constructed(&self, obj: &Self::Type) {
self.parent_constructed(obj);
obj.set_live(true); // this is always a live source!
obj.set_automatic_eos(false);
obj.set_format(gst::Format::Bytes);
}
@ -166,16 +188,57 @@ impl ElementImpl for RtmpSvrSrc {}
impl BaseSrcImpl for RtmpSvrSrc {
fn start(&self, src: &Self::Type) -> Result<(), gst::ErrorMessage> {
// TODO: Here we start the server..
// TODO: consider sharing context with other gst elements
// - Create a socket
let (media_sender, media_receiver) = channel();
let mut state = self.state.lock().unwrap();
if let State::Started { .. } = *state {
return Ok(());
}
let settings = self.settings.lock().unwrap();
let address = format!("{}:{}", settings.address, settings.port);
let listener = TcpListener::bind(&address).map_err(|err| {
gst::error_msg!(
gst::ResourceError::Busy,
["Failed to bind to address {}: {}", address, err]
)
})?;
let (connection_sender, connection_receiver) = channel();
// TODO: Capture the join handle and use it to gracefully shutdown
thread::spawn(|| handle_connections(media_sender, connection_receiver));
thread::spawn(|| accept_connections(connection_sender, listener));
*state = State::Started {
source: media_receiver,
position: 0,
video_caps: None,
audio_caps: None,
};
// - Create channel to receive data (metadata and media data)
// - Create a thread that handle connections
// - Wait for clients to connect
// - Whenever a client connects and starts sending content
// - When a Connection is active, we can "start" the RtmpSvrSrc to publish buffers of
// content to the stream.
Ok(())
}
fn stop(&self, src: &Self::Type) -> Result<(), gst::ErrorMessage> {
gst_debug!(CAT, obj: src, "Stopping");
// TODO: Here we stop the server
// - Notify the server to stop accepting connections
// - Notify the connections the stream ended
let mut state = self.state.lock().unwrap();
*state = State::Stopped;
Ok(())
}
fn is_seekable(&self, _src: &Self::Type) -> bool {
// We cannot go back to previous content
false
}
@ -206,26 +269,206 @@ impl BaseSrcImpl for RtmpSvrSrc {
impl PushSrcImpl for RtmpSvrSrc {
fn create(&self, src: &Self::Type) -> Result<gst::Buffer, gst::FlowError> {
let mut state = self.state.lock().unwrap();
// gst_debug!(CAT, obj: src, "End of stream");
// Err(gst::FlowError::Eos)
match *state {
State::Started { .. } => {
let chunk = Bytes::from("Mock");
// Here we return the buffer
let size = chunk.len();
assert_ne!(chunk.len(), 0);
let buffer = gst::Buffer::from_slice(chunk);
Ok(buffer)
}
let (source, position, video_caps, audio_caps) = match *state {
State::Stopped => {
gst::element_error!(src, gst::LibraryError::Failed, ["Not started yet"]);
return Err(gst::FlowError::Error);
}
State::Started {
ref source,
ref mut position,
ref mut video_caps,
ref mut audio_caps,
} => (source, position, video_caps, audio_caps),
};
loop {
let input = match source.try_recv() {
Result::Ok(i) => i,
Result::Err(TryRecvError::Empty) => continue, // blocks waiting for content
Result::Err(TryRecvError::Disconnected) => {
return Err(gst::FlowError::Eos);
}
};
match input {
RtmpInput::Metadata(metadata) => {
println!("Metadata: {:?}", metadata);
// TODO: check for the actual format, do not just assume
let mut caps = gst::Caps::builder("video/x-flv");
//gst::Caps::builder("video/x-h264").field("stream-format", &"avc");
if let Some(val) = metadata.video_height {
caps = caps.field("height", &val);
}
if let Some(val) = metadata.video_width {
caps = caps.field("width", &val);
}
if let Some(val) = metadata.video_frame_rate {
caps = caps.field("framerate", &val);
}
*video_caps = Some(caps.build());
// TODO: check for the actual format, do not just assume acc
let mut caps = gst::Caps::builder("audio/mpeg")
.field("mpegversion", &4i32)
.field("framed", &true)
.field("stream-format", &"raw");
if let Some(val) = metadata.audio_channels {
caps = caps.field("channels", &val);
}
if let Some(val) = metadata.audio_sample_rate {
caps = caps.field("rate", &val);
}
*audio_caps = Some(caps.build());
}
RtmpInput::Media(media) => {
// TODO: Decide what to set based on content
if let (MediaType::Video, Some(video_caps)) =
(media.media_type, video_caps.as_ref())
{
gst_info!(CAT, obj: src, "Setting {:?}", video_caps);
src.set_caps(video_caps)
.map_err(|_| gst::FlowError::NotNegotiated)?;
// let templ = src.get_element_class().get_pad_template("video").unwrap();
let chunk = media.data;
// Here we return the buffer
let size = chunk.len();
assert_ne!(chunk.len(), 0);
let offset = *position;
*position += size as u64;
gst_info!(
CAT,
obj: src,
"Chunk of {} bytes received at offset {}",
chunk.len(),
offset
);
let mut buffer = gst::Buffer::from_slice(chunk);
{
let buffer = buffer.get_mut().unwrap();
buffer.set_offset(offset);
buffer.set_offset_end(offset + size as u64);
}
return Ok(buffer);
}
// TODO: Handle Audio content
}
}
}
gst::element_error!(src, gst::LibraryError::TooLazy, ["No content yet"]);
return Err(gst::FlowError::Error);
}
}
/// Accepts TCP connections
fn accept_connections(connection_sender: Sender<TcpStream>, listener: TcpListener) {
println!("Listening for connections...");
for stream in listener.incoming() {
println!("New connection!");
match connection_sender.send(stream.unwrap()) {
Ok(_) => (),
Err(error) => panic!("Error sending stream to connection handler: {:?}", error),
}
}
}
/// Handle the lifecycle of all TCP connections by sending and receiving data
fn handle_connections(media_sink: Sender<RtmpInput>, connection_receiver: Receiver<TcpStream>) {
let mut connections = Slab::new();
let mut connection_ids = HashSet::new();
let mut server = Server::new(media_sink);
loop {
match connection_receiver.try_recv() {
Err(TryRecvError::Disconnected) => panic!("Connection receiver closed"),
Err(TryRecvError::Empty) => (),
Ok(stream) => {
let connection = Connection::new(stream);
let id = connections.insert(connection);
let connection = connections.get_mut(id).unwrap();
connection.connection_id = Some(id);
connection_ids.insert(id);
println!("Connection {} started", id);
}
}
let mut ids_to_clear = Vec::new();
let mut packets_to_write = Vec::new();
for connection_id in &connection_ids {
let connection = connections.get_mut(*connection_id).unwrap();
match connection.read() {
Err(ConnectionError::SocketClosed) => {
println!("Socket closed for id {}", connection_id);
ids_to_clear.push(*connection_id);
}
Err(error) => {
println!(
"I/O error while reading connection {}: {:?}",
connection_id, error
);
ids_to_clear.push(*connection_id);
}
Ok(result) => match result {
ReadResult::NoBytesReceived => (),
ReadResult::HandshakingInProgress => (),
ReadResult::BytesReceived { buffer, byte_count } => {
let mut server_results =
match server.bytes_received(*connection_id, &buffer[..byte_count]) {
Ok(results) => results,
Err(error) => {
println!("Input caused the following server error: {}", error);
ids_to_clear.push(*connection_id);
continue;
}
};
for result in server_results.drain(..) {
match result {
ServerResult::OutboundPacket {
target_connection_id,
packet,
} => {
packets_to_write.push((target_connection_id, packet));
}
ServerResult::DisconnectConnection {
connection_id: id_to_close,
} => {
ids_to_clear.push(id_to_close);
}
}
}
}
},
}
}
for (connection_id, packet) in packets_to_write.drain(..) {
let connection = connections.get_mut(connection_id).unwrap();
connection.write(packet.bytes);
}
for closed_id in ids_to_clear {
println!("Connection {} closed", closed_id);
connection_ids.remove(&closed_id);
connections.remove(closed_id);
server.notify_connection_closed(closed_id);
}
}
}

1
src/lib.rs
View file

@ -1,6 +1,7 @@
use glib::prelude::*;
mod connection;
mod data;
mod imp;
mod server;

61
src/server.rs
View file

@ -1,3 +1,5 @@
// Based on the example code in: https://github.com/KallDrexx/rust-media-libs/blob/master/examples/threaded_rtmp_server/src/server.rs
use crate::data::{Media, MediaType, RtmpInput};
use bytes::Bytes;
use rml_rtmp::chunk_io::Packet;
use rml_rtmp::sessions::StreamMetadata;
@ -8,6 +10,7 @@ use rml_rtmp::time::RtmpTimestamp;
use slab::Slab;
use std::collections::{HashMap, HashSet};
use std::rc::Rc;
use std::sync::mpsc::Sender;
enum ClientAction {
Waiting,
@ -63,14 +66,18 @@ pub struct Server {
clients: Slab<Client>,
connection_to_client_map: HashMap<usize, usize>,
channels: HashMap<String, MediaChannel>,
media_sink: Sender<RtmpInput>,
has_received_keyframe: bool,
}
impl Server {
pub fn new() -> Server {
Server {
clients: Slab::with_capacity(1024),
connection_to_client_map: HashMap::with_capacity(1024),
pub fn new(media_sink: Sender<RtmpInput>) -> Self {
Self {
clients: Slab::with_capacity(8),
connection_to_client_map: HashMap::with_capacity(8),
channels: HashMap::new(),
media_sink,
has_received_keyframe: false,
}
}
@ -514,9 +521,11 @@ impl Server {
None => return,
};
self.media_sink
.send(RtmpInput::Metadata(metadata.clone()))
.unwrap();
let metadata = Rc::new(metadata);
channel.metadata = Some(metadata.clone());
// Send the metadata to all current watchers
for client_id in &channel.watching_client_ids {
let client = match self.clients.get_mut(*client_id) {
@ -580,6 +589,48 @@ impl Server {
}
}
// send to gstreamer element
{
let should_send_to_client = match data_type {
ReceivedDataType::Video => {
self.has_received_keyframe
|| (is_video_sequence_header(data.clone())
|| is_video_keyframe(data.clone()))
}
ReceivedDataType::Audio => {
self.has_received_keyframe || is_audio_sequence_header(data.clone())
}
};
if should_send_to_client {
match data_type {
ReceivedDataType::Audio => self
.media_sink
.send(RtmpInput::Media(Media {
media_type: MediaType::Audio,
data: data.clone(),
timestamp: timestamp.value,
can_be_dropped: true,
}))
.unwrap(),
ReceivedDataType::Video => {
if is_video_keyframe(data.clone()) {
self.has_received_keyframe = true;
}
self.media_sink
.send(RtmpInput::Media(Media {
media_type: MediaType::Video,
data: data.clone(),
timestamp: timestamp.value,
can_be_dropped: true,
}))
.unwrap();
}
};
}
}
for client_id in &channel.watching_client_ids {
let client = match self.clients.get_mut(*client_id) {
Some(client) => client,