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Handle stopped state

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This commit is contained in:
Rafael Caricio 2020-12-30 23:15:29 +01:00
parent 90cceb9bc6
commit 102523f435
Signed by: rafaelcaricio
GPG key ID: 3C86DBCE8E93C947
4 changed files with 363 additions and 202 deletions
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31
src/connection.rs
View file

@ -1,11 +1,11 @@
use rml_rtmp::handshake::{Handshake, HandshakeProcessResult, PeerType};
use std::collections::VecDeque;
use std::io;
use std::io::{Read, Write};
use std::time::Duration;
use std::net::TcpStream;
use std::sync::mpsc::{channel, Receiver, Sender, TryRecvError};
use std::thread;
use rml_rtmp::handshake::{Handshake, HandshakeProcessResult, PeerType};
use std::time::Duration;
const BUFFER_SIZE: usize = 4096;
@ -63,17 +63,16 @@ impl Connection {
match self.reader.try_recv() {
Err(TryRecvError::Empty) => Ok(ReadResult::NoBytesReceived),
Err(TryRecvError::Disconnected) => Err(ConnectionError::SocketClosed),
Ok(result) => {
match self.handshake_completed {
Ok(result) => match self.handshake_completed {
true => Ok(result),
false => match result {
ReadResult::HandshakingInProgress => unreachable!(),
ReadResult::NoBytesReceived => Ok(result),
ReadResult::BytesReceived {buffer, byte_count}
=> self.handle_handshake_bytes(&buffer[..byte_count]),
}
}
ReadResult::BytesReceived { buffer, byte_count } => {
self.handle_handshake_bytes(&buffer[..byte_count])
}
},
},
}
}
@ -93,9 +92,12 @@ impl Connection {
}
Ok(ReadResult::HandshakingInProgress)
},
}
HandshakeProcessResult::Completed {response_bytes, remaining_bytes} => {
HandshakeProcessResult::Completed {
response_bytes,
remaining_bytes,
} => {
println!("Handshake successful!");
if response_bytes.len() > 0 {
self.write(response_bytes);
@ -108,7 +110,10 @@ impl Connection {
}
self.handshake_completed = true;
Ok(ReadResult::BytesReceived {buffer, byte_count: buffer_size})
Ok(ReadResult::BytesReceived {
buffer,
byte_count: buffer_size,
})
}
}
}
@ -136,7 +141,7 @@ fn start_byte_writer(byte_receiver: Receiver<Vec<u8>>, socket: &TcpStream) {
println!("Error writing to socket: {:?}", error);
return;
}
}
},
}
}
});
@ -161,7 +166,7 @@ fn start_result_reader(sender: Sender<ReadResult>, socket: &TcpStream) {
};
sender.send(result).unwrap();
},
}
Err(error) => {
println!("Error occurred reading from socket: {:?}", error);

46
src/imp.rs
View file

@ -1,3 +1,5 @@
use crate::server::Server;
use bytes::Bytes;
use glib::subclass;
use glib::subclass::prelude::*;
use gst::prelude::*;
@ -5,12 +7,9 @@ use gst::subclass::prelude::*;
use gst::{gst_debug, gst_error, gst_info, gst_log};
use gst_base::prelude::*;
use gst_base::subclass::prelude::*;
use once_cell::sync::Lazy;
use std::u32;
use crate::server::Server;
use std::sync::Mutex;
use bytes::Bytes;
use std::u32;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
@ -26,14 +25,14 @@ const DEFAULT_PORT: u32 = 5000;
#[derive(Debug, Clone)]
struct Settings {
address: String,
port: u32
port: u32,
}
impl Default for Settings {
fn default() -> Self {
Settings {
address: DEFAULT_ADDRESS.into(),
port: DEFAULT_PORT
port: DEFAULT_PORT,
}
}
}
@ -45,7 +44,7 @@ static PROPERTIES: [subclass::Property; 2] = [
"Address",
"The address the server should listen for incoming connections",
DEFAULT_ADDRESS.into(),
glib::ParamFlags::READWRITE
glib::ParamFlags::READWRITE,
)
}),
subclass::Property("port", |name| {
@ -56,7 +55,7 @@ static PROPERTIES: [subclass::Property; 2] = [
1000,
u32::MAX,
DEFAULT_PORT,
glib::ParamFlags::READWRITE
glib::ParamFlags::READWRITE,
)
}),
];
@ -64,9 +63,7 @@ static PROPERTIES: [subclass::Property; 2] = [
#[derive(Debug)]
enum State {
Stopped,
Started {
stream_key: String,
},
Started { stream_key: String },
}
impl Default for State {
@ -103,7 +100,8 @@ impl ObjectSubclass for RtmpSvrSrc {
gst::PadDirection::Src,
gst::PadPresence::Always,
&caps,
).unwrap();
)
.unwrap();
klass.add_pad_template(src_pad_template);
klass.install_properties(&PROPERTIES);
@ -118,13 +116,16 @@ impl ObjectSubclass for RtmpSvrSrc {
}
impl ObjectImpl for RtmpSvrSrc {
fn set_property(&self, obj: &Self::Type, id: usize, value: &glib::Value) {
let prop = &PROPERTIES[id];
match *prop {
subclass::Property("address", ..) => {
let mut settings = self.settings.lock().unwrap();
let address = value.get().expect("type checked upstream").unwrap_or_else(|| DEFAULT_ADDRESS).into();
let address = value
.get()
.expect("type checked upstream")
.unwrap_or_else(|| DEFAULT_ADDRESS)
.into();
settings.address = address;
gst_debug!(CAT, obj: obj, "Set address to: {}", settings.address);
}
@ -137,6 +138,7 @@ impl ObjectImpl for RtmpSvrSrc {
_ => unimplemented!(),
};
}
fn get_property(&self, obj: &Self::Type, id: usize) -> glib::Value {
let prop = &PROPERTIES[id];
match *prop {
@ -204,7 +206,12 @@ 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();
if let State::Started { .. } = *state {
// 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();
@ -213,9 +220,12 @@ impl PushSrcImpl for RtmpSvrSrc {
let buffer = gst::Buffer::from_slice(chunk);
Ok(buffer)
} else {
gst_debug!(CAT, obj: src, "End of stream");
Err(gst::FlowError::Eos)
}
State::Stopped => {
gst::element_error!(src, gst::LibraryError::Failed, ["Not started yet"]);
return Err(gst::FlowError::Error);
}
}
}
}

2
src/lib.rs
View file

@ -1,7 +1,7 @@
use glib::prelude::*;
mod imp;
mod connection;
mod imp;
mod server;
glib::wrapper! {

394
src/server.rs
View file

@ -1,22 +1,24 @@
use bytes::Bytes;
use rml_rtmp::chunk_io::Packet;
use rml_rtmp::sessions::StreamMetadata;
use rml_rtmp::sessions::{
ServerSession, ServerSessionConfig, ServerSessionEvent, ServerSessionResult,
};
use rml_rtmp::time::RtmpTimestamp;
use slab::Slab;
use std::collections::{HashMap, HashSet};
use std::rc::Rc;
use bytes::Bytes;
use slab::Slab;
use rml_rtmp::sessions::{ServerSession, ServerSessionConfig, ServerSessionResult, ServerSessionEvent};
use rml_rtmp::sessions::StreamMetadata;
use rml_rtmp::chunk_io::Packet;
use rml_rtmp::time::RtmpTimestamp;
enum ClientAction {
Waiting,
Publishing(String), // Publishing to a stream key
Watching {
stream_key: String,
stream_id: u32,
},
Watching { stream_key: String, stream_id: u32 },
}
enum ReceivedDataType {Audio, Video}
enum ReceivedDataType {
Audio,
Video,
}
struct Client {
session: ServerSession,
@ -30,7 +32,10 @@ impl Client {
match self.current_action {
ClientAction::Waiting => None,
ClientAction::Publishing(_) => None,
ClientAction::Watching {stream_key: _, stream_id} => Some(stream_id),
ClientAction::Watching {
stream_key: _,
stream_id,
} => Some(stream_id),
}
}
}
@ -45,11 +50,13 @@ struct MediaChannel {
#[derive(Debug)]
pub enum ServerResult {
DisconnectConnection {connection_id: usize},
DisconnectConnection {
connection_id: usize,
},
OutboundPacket {
target_connection_id: usize,
packet: Packet,
}
},
}
pub struct Server {
@ -67,7 +74,11 @@ impl Server {
}
}
pub fn bytes_received(&mut self, connection_id: usize, bytes: &[u8]) -> Result<Vec<ServerResult>, String> {
pub fn bytes_received(
&mut self,
connection_id: usize,
bytes: &[u8],
) -> Result<Vec<ServerResult>, String> {
let mut server_results = Vec::new();
if !self.connection_to_client_map.contains_key(&connection_id) {
@ -78,7 +89,11 @@ impl Server {
Err(error) => return Err(error.to_string()),
};
self.handle_session_results(connection_id, initial_session_results, &mut server_results);
self.handle_session_results(
connection_id,
initial_session_results,
&mut server_results,
);
let client = Client {
session,
connection_id,
@ -87,7 +102,8 @@ impl Server {
};
let client_id = Some(self.clients.insert(client));
self.connection_to_client_map.insert(connection_id, client_id.unwrap());
self.connection_to_client_map
.insert(connection_id, client_id.unwrap());
}
let client_results: Vec<ServerSessionResult>;
@ -111,17 +127,22 @@ impl Server {
let client = self.clients.remove(client_id);
match client.current_action {
ClientAction::Publishing(stream_key) => self.publishing_ended(stream_key),
ClientAction::Watching{stream_key, stream_id: _} => self.play_ended(client_id, stream_key),
ClientAction::Watching {
stream_key,
stream_id: _,
} => self.play_ended(client_id, stream_key),
ClientAction::Waiting => (),
}
},
}
}
}
fn handle_session_results(&mut self,
fn handle_session_results(
&mut self,
executed_connection_id: usize,
session_results: Vec<ServerSessionResult>,
server_results: &mut Vec<ServerResult>) {
server_results: &mut Vec<ServerResult>,
) {
for result in session_results {
match result {
ServerSessionResult::OutboundResponse(packet) => {
@ -129,59 +150,133 @@ impl Server {
target_connection_id: executed_connection_id,
packet,
})
},
}
ServerSessionResult::RaisedEvent(event) =>
self.handle_raised_event(executed_connection_id, event, server_results),
ServerSessionResult::RaisedEvent(event) => {
self.handle_raised_event(executed_connection_id, event, server_results)
}
x => println!("Server result received: {:?}", x),
}
}
}
fn handle_raised_event(&mut self,
fn handle_raised_event(
&mut self,
executed_connection_id: usize,
event: ServerSessionEvent,
server_results: &mut Vec<ServerResult>) {
server_results: &mut Vec<ServerResult>,
) {
match event {
ServerSessionEvent::ConnectionRequested {request_id, app_name} => {
self.handle_connection_requested(executed_connection_id, request_id, app_name, server_results);
},
ServerSessionEvent::ConnectionRequested {
request_id,
app_name,
} => {
self.handle_connection_requested(
executed_connection_id,
request_id,
app_name,
server_results,
);
}
ServerSessionEvent::PublishStreamRequested {request_id, app_name, stream_key, mode: _} => {
self.handle_publish_requested(executed_connection_id, request_id, app_name, stream_key, server_results);
},
ServerSessionEvent::PublishStreamRequested {
request_id,
app_name,
stream_key,
mode: _,
} => {
self.handle_publish_requested(
executed_connection_id,
request_id,
app_name,
stream_key,
server_results,
);
}
ServerSessionEvent::PlayStreamRequested {request_id, app_name, stream_key, start_at: _, duration: _, reset: _, stream_id} => {
self.handle_play_requested(executed_connection_id, request_id, app_name, stream_key, stream_id, server_results);
},
ServerSessionEvent::PlayStreamRequested {
request_id,
app_name,
stream_key,
start_at: _,
duration: _,
reset: _,
stream_id,
} => {
self.handle_play_requested(
executed_connection_id,
request_id,
app_name,
stream_key,
stream_id,
server_results,
);
}
ServerSessionEvent::StreamMetadataChanged {app_name, stream_key, metadata} => {
ServerSessionEvent::StreamMetadataChanged {
app_name,
stream_key,
metadata,
} => {
self.handle_metadata_received(app_name, stream_key, metadata, server_results);
},
}
ServerSessionEvent::VideoDataReceived {app_name: _, stream_key, data, timestamp} => {
self.handle_audio_video_data_received(stream_key, timestamp, data, ReceivedDataType::Video, server_results);
},
ServerSessionEvent::VideoDataReceived {
app_name: _,
stream_key,
data,
timestamp,
} => {
self.handle_audio_video_data_received(
stream_key,
timestamp,
data,
ReceivedDataType::Video,
server_results,
);
}
ServerSessionEvent::AudioDataReceived {app_name: _, stream_key, data, timestamp} => {
self.handle_audio_video_data_received(stream_key, timestamp, data, ReceivedDataType::Audio, server_results);
},
ServerSessionEvent::AudioDataReceived {
app_name: _,
stream_key,
data,
timestamp,
} => {
self.handle_audio_video_data_received(
stream_key,
timestamp,
data,
ReceivedDataType::Audio,
server_results,
);
}
_ => println!("Event raised by connection {}: {:?}", executed_connection_id, event),
_ => println!(
"Event raised by connection {}: {:?}",
executed_connection_id, event
),
}
}
fn handle_connection_requested(&mut self,
fn handle_connection_requested(
&mut self,
requested_connection_id: usize,
request_id: u32,
app_name: String,
server_results: &mut Vec<ServerResult>) {
println!("Connection {} requested connection to app '{}'", requested_connection_id, app_name);
server_results: &mut Vec<ServerResult>,
) {
println!(
"Connection {} requested connection to app '{}'",
requested_connection_id, app_name
);
let accept_result;
{
let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
let client_id = self
.connection_to_client_map
.get(&requested_connection_id)
.unwrap();
let client = self.clients.get_mut(*client_id).unwrap();
accept_result = client.session.accept_request(request_id);
}
@ -190,9 +285,9 @@ impl Server {
Err(error) => {
println!("Error occurred accepting connection request: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
)
},
connection_id: requested_connection_id,
})
}
Ok(results) => {
self.handle_session_results(requested_connection_id, results, server_results);
@ -200,13 +295,18 @@ impl Server {
}
}
fn handle_publish_requested(&mut self,
fn handle_publish_requested(
&mut self,
requested_connection_id: usize,
request_id: u32,
app_name: String,
stream_key: String,
server_results: &mut Vec<ServerResult>) {
println!("Publish requested on app '{}' and stream key '{}'", app_name, stream_key);
server_results: &mut Vec<ServerResult>,
) {
println!(
"Publish requested on app '{}' and stream key '{}'",
app_name, stream_key
);
match self.channels.get(&stream_key) {
None => (),
@ -214,21 +314,24 @@ impl Server {
None => (),
Some(_) => {
println!("Stream key already being published to");
server_results.push(ServerResult::DisconnectConnection {connection_id: requested_connection_id});
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id,
});
return;
}
}
},
}
let accept_result;
{
let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
let client_id = self
.connection_to_client_map
.get(&requested_connection_id)
.unwrap();
let client = self.clients.get_mut(*client_id).unwrap();
client.current_action = ClientAction::Publishing(stream_key.clone());
let channel = self.channels
.entry(stream_key)
.or_insert(MediaChannel {
let channel = self.channels.entry(stream_key).or_insert(MediaChannel {
publishing_client_id: None,
watching_client_ids: HashSet::new(),
metadata: None,
@ -244,9 +347,9 @@ impl Server {
Err(error) => {
println!("Error occurred accepting publish request: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
)
},
connection_id: requested_connection_id,
})
}
Ok(results) => {
self.handle_session_results(requested_connection_id, results, server_results);
@ -254,25 +357,34 @@ impl Server {
}
}
fn handle_play_requested(&mut self,
fn handle_play_requested(
&mut self,
requested_connection_id: usize,
request_id: u32,
app_name: String,
stream_key: String,
stream_id: u32,
server_results: &mut Vec<ServerResult>) {
println!("Play requested on app '{}' and stream key '{}'", app_name, stream_key);
server_results: &mut Vec<ServerResult>,
) {
println!(
"Play requested on app '{}' and stream key '{}'",
app_name, stream_key
);
let accept_result;
{
let client_id = self.connection_to_client_map.get(&requested_connection_id).unwrap();
let client_id = self
.connection_to_client_map
.get(&requested_connection_id)
.unwrap();
let client = self.clients.get_mut(*client_id).unwrap();
client.current_action = ClientAction::Watching {
stream_key: stream_key.clone(),
stream_id,
};
let channel = self.channels
let channel = self
.channels
.entry(stream_key.clone())
.or_insert(MediaChannel {
publishing_client_id: None,
@ -286,22 +398,24 @@ impl Server {
accept_result = match client.session.accept_request(request_id) {
Err(error) => Err(error),
Ok(mut results) => {
// If the channel already has existing metadata, send that to the new client
// so they have up to date info
match channel.metadata {
None => (),
Some(ref metadata) => {
let packet = match client.session.send_metadata(stream_id, metadata.clone()) {
let packet = match client
.session
.send_metadata(stream_id, metadata.clone())
{
Ok(packet) => packet,
Err(error) => {
println!("Error occurred sending existing metadata to new client: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
);
connection_id: requested_connection_id,
});
return;
},
}
};
results.push(ServerSessionResult::OutboundResponse(packet));
@ -312,16 +426,24 @@ impl Server {
match channel.video_sequence_header {
None => (),
Some(ref data) => {
let packet = match client.session.send_video_data(stream_id, data.clone(), RtmpTimestamp::new(0), false) {
let packet = match client.session.send_video_data(
stream_id,
data.clone(),
RtmpTimestamp::new(0),
false,
) {
Ok(packet) => packet,
Err(error) => {
println!("Error occurred sending video header to new client: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
println!(
"Error occurred sending video header to new client: {:?}",
error
);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id,
});
return;
},
}
};
results.push(ServerSessionResult::OutboundResponse(packet));
@ -331,16 +453,24 @@ impl Server {
match channel.audio_sequence_header {
None => (),
Some(ref data) => {
let packet = match client.session.send_audio_data(stream_id, data.clone(), RtmpTimestamp::new(0), false) {
let packet = match client.session.send_audio_data(
stream_id,
data.clone(),
RtmpTimestamp::new(0),
false,
) {
Ok(packet) => packet,
Err(error) => {
println!("Error occurred sending audio header to new client: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
println!(
"Error occurred sending audio header to new client: {:?}",
error
);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id,
});
return;
},
}
};
results.push(ServerSessionResult::OutboundResponse(packet));
@ -356,11 +486,11 @@ impl Server {
Err(error) => {
println!("Error occurred accepting playback request: {:?}", error);
server_results.push(ServerResult::DisconnectConnection {
connection_id: requested_connection_id}
);
connection_id: requested_connection_id,
});
return;
},
}
Ok(results) => {
self.handle_session_results(requested_connection_id, results, server_results);
@ -368,12 +498,17 @@ impl Server {
}
}
fn handle_metadata_received(&mut self,
fn handle_metadata_received(
&mut self,
app_name: String,
stream_key: String,
metadata: StreamMetadata,
server_results: &mut Vec<ServerResult>) {
println!("New metadata received for app '{}' and stream key '{}'", app_name, stream_key);
server_results: &mut Vec<ServerResult>,
) {
println!(
"New metadata received for app '{}' and stream key '{}'",
app_name, stream_key
);
let channel = match self.channels.get_mut(&stream_key) {
Some(channel) => channel,
None => return,
@ -394,30 +529,36 @@ impl Server {
None => continue,
};
match client.session.send_metadata(active_stream_id, metadata.clone()) {
Ok(packet) => {
server_results.push(ServerResult::OutboundPacket {
match client
.session
.send_metadata(active_stream_id, metadata.clone())
{
Ok(packet) => server_results.push(ServerResult::OutboundPacket {
target_connection_id: client.connection_id,
packet,
})
},
}),
Err(error) => {
println!("Error sending metadata to client on connection id {}: {:?}", client.connection_id, error);
println!(
"Error sending metadata to client on connection id {}: {:?}",
client.connection_id, error
);
server_results.push(ServerResult::DisconnectConnection {
connection_id: client.connection_id
connection_id: client.connection_id,
});
},
}
}
}
}
fn handle_audio_video_data_received(&mut self,
fn handle_audio_video_data_received(
&mut self,
stream_key: String,
timestamp: RtmpTimestamp,
data: Bytes,
data_type: ReceivedDataType,
server_results: &mut Vec<ServerResult>) {
server_results: &mut Vec<ServerResult>,
) {
let channel = match self.channels.get_mut(&stream_key) {
Some(channel) => channel,
None => return,
@ -430,7 +571,7 @@ impl Server {
if is_video_sequence_header(data.clone()) {
channel.video_sequence_header = Some(data.clone());
}
},
}
ReceivedDataType::Audio => {
if is_audio_sequence_header(data.clone()) {
@ -452,14 +593,14 @@ impl Server {
let should_send_to_client = match data_type {
ReceivedDataType::Video => {
client.has_received_video_keyframe ||
(is_video_sequence_header(data.clone()) ||
is_video_keyframe(data.clone()))
},
client.has_received_video_keyframe
|| (is_video_sequence_header(data.clone())
|| is_video_keyframe(data.clone()))
}
ReceivedDataType::Audio => {
client.has_received_video_keyframe || is_audio_sequence_header(data.clone())
},
}
};
if !should_send_to_client {
@ -467,30 +608,41 @@ impl Server {
}
let send_result = match data_type {
ReceivedDataType::Audio => client.session.send_audio_data(active_stream_id, data.clone(), timestamp.clone(), true),
ReceivedDataType::Audio => client.session.send_audio_data(
active_stream_id,
data.clone(),
timestamp.clone(),
true,
),
ReceivedDataType::Video => {
if is_video_keyframe(data.clone()) {
client.has_received_video_keyframe = true;
}
client.session.send_video_data(active_stream_id, data.clone(), timestamp.clone(), true)
},
client.session.send_video_data(
active_stream_id,
data.clone(),
timestamp.clone(),
true,
)
}
};
match send_result {
Ok(packet) => {
server_results.push(ServerResult::OutboundPacket {
Ok(packet) => server_results.push(ServerResult::OutboundPacket {
target_connection_id: client.connection_id,
packet,
})
},
}),
Err(error) => {
println!("Error sending metadata to client on connection id {}: {:?}", client.connection_id, error);
println!(
"Error sending metadata to client on connection id {}: {:?}",
client.connection_id, error
);
server_results.push(ServerResult::DisconnectConnection {
connection_id: client.connection_id
connection_id: client.connection_id,
});
},
}
}
}
}
@ -517,21 +669,15 @@ impl Server {
fn is_video_sequence_header(data: Bytes) -> bool {
// This is assuming h264.
return data.len() >= 2 &&
data[0] == 0x17 &&
data[1] == 0x00;
return data.len() >= 2 && data[0] == 0x17 && data[1] == 0x00;
}
fn is_audio_sequence_header(data: Bytes) -> bool {
// This is assuming aac
return data.len() >= 2 &&
data[0] == 0xaf &&
data[1] == 0x00;
return data.len() >= 2 && data[0] == 0xaf && data[1] == 0x00;
}
fn is_video_keyframe(data: Bytes) -> bool {
// assumings h264
return data.len() >= 2 &&
data[0] == 0x17 &&
data[1] != 0x00; // 0x00 is the sequence header, don't count that for now
return data.len() >= 2 && data[0] == 0x17 && data[1] != 0x00; // 0x00 is the sequence header, don't count that for now
}