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|
use gst::glib;
use gst::subclass::prelude::*;
use gst_rtp::prelude::*;
use gst_rtp::subclass::prelude::*;
use once_cell::sync::Lazy;
use std::sync::Mutex;
#[derive(Default)]
struct State {
// Aggregate payloads to form a complete XML document
adapter: gst_base::UniqueAdapter,
}
#[derive(Default)]
pub struct OnvifMetadataDepay {
state: Mutex<State>,
}
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"rtponvifmetadatadepay",
gst::DebugColorFlags::empty(),
Some("ONVIF metadata depayloader"),
)
});
#[glib::object_subclass]
impl ObjectSubclass for OnvifMetadataDepay {
const NAME: &'static str = "GstOnvifMetadataDepay";
type Type = super::OnvifMetadataDepay;
type ParentType = gst_rtp::RTPBaseDepayload;
}
impl ObjectImpl for OnvifMetadataDepay {}
impl GstObjectImpl for OnvifMetadataDepay {}
impl ElementImpl for OnvifMetadataDepay {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"ONVIF metadata RTP depayloader",
"Depayloader/Network/RTP",
"ONVIF metadata RTP depayloader",
"Mathieu Duponchelle <mathieu@centricular.com>",
)
});
Some(&*ELEMENT_METADATA)
}
fn pad_templates() -> &'static [gst::PadTemplate] {
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
let sink_caps = gst::Caps::builder("application/x-rtp")
.field("media", "application")
.field("payload", gst::IntRange::new(96, 127))
.field("clock-rate", 90000)
.field("encoding-name", "VND.ONVIF.METADATA")
.build();
let sink_pad_template = gst::PadTemplate::new(
"sink",
gst::PadDirection::Sink,
gst::PadPresence::Always,
&sink_caps,
)
.unwrap();
let src_caps = gst::Caps::builder("application/x-onvif-metadata").build();
let src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&src_caps,
)
.unwrap();
vec![src_pad_template, sink_pad_template]
});
PAD_TEMPLATES.as_ref()
}
}
impl RTPBaseDepayloadImpl for OnvifMetadataDepay {
fn set_caps(&self, _caps: &gst::Caps) -> Result<(), gst::LoggableError> {
let element = self.instance();
let src_pad = element.src_pad();
let src_caps = src_pad.pad_template_caps();
src_pad.push_event(gst::event::Caps::builder(&src_caps).build());
Ok(())
}
fn process_rtp_packet(
&self,
rtp_buffer: &gst_rtp::RTPBuffer<gst_rtp::rtp_buffer::Readable>,
) -> Option<gst::Buffer> {
// Retrieve the payload subbuffer
let payload_buffer = match rtp_buffer.payload_buffer() {
Ok(buffer) => buffer,
Err(..) => {
gst::element_imp_error!(
self,
gst::ResourceError::Read,
["Failed to retrieve RTP buffer payload"]
);
return None;
}
};
let mut state = self.state.lock().unwrap();
if rtp_buffer
.buffer()
.flags()
.contains(gst::BufferFlags::DISCONT)
{
gst::debug!(CAT, imp: self, "processing discont RTP buffer");
state.adapter.clear();
}
// Now store in the adapter
state.adapter.push(payload_buffer);
if !rtp_buffer.is_marker() {
return None;
}
// We have found the last chunk for this document, empty the adapter
let available = state.adapter.available();
let buffer = match state.adapter.take_buffer(available) {
Ok(buffer) => buffer,
Err(err) => {
gst::element_imp_error!(
self,
gst::ResourceError::Read,
["Failed to empty adapter: {}", err]
);
return None;
}
};
// Sanity check the document
let map = buffer.map_readable().unwrap();
let utf8 = match std::str::from_utf8(map.as_ref()) {
Ok(s) => s,
Err(err) => {
gst::warning!(CAT, imp: self, "Failed to decode payload as UTF-8: {}", err);
return None;
}
};
let forward = {
let mut forward = false;
for token in xmlparser::Tokenizer::from(utf8) {
match token {
Ok(token) => match token {
xmlparser::Token::Comment { .. } => {
continue;
}
xmlparser::Token::Declaration { .. } => {
continue;
}
xmlparser::Token::ElementStart { local, .. } => {
if local.as_str() == "MetadataStream" {
forward = true;
}
break;
}
_ => {
forward = false;
break;
}
},
Err(err) => {
gst::warning!(CAT, imp: self, "Invalid XML in payload: {}", err);
return None;
}
}
}
forward
};
// Incomplete, wait for the next document
if !forward {
gst::warning!(
CAT,
imp: self,
"document must start with tt:MetadataStream element",
);
return None;
}
drop(map);
Some(buffer)
}
}
|
