1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
use gst::glib;
use gst::subclass::prelude::*;
use gst_rtp::prelude::*;
use gst_rtp::subclass::prelude::*;
use once_cell::sync::Lazy;
#[derive(Default)]
pub struct OnvifMetadataPay {}
#[glib::object_subclass]
impl ObjectSubclass for OnvifMetadataPay {
const NAME: &'static str = "GstOnvifMetadataPay";
type Type = super::OnvifMetadataPay;
type ParentType = gst_rtp::RTPBasePayload;
}
impl ObjectImpl for OnvifMetadataPay {}
impl GstObjectImpl for OnvifMetadataPay {}
impl ElementImpl for OnvifMetadataPay {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"ONVIF metadata RTP payloader",
"Payloader/Network/RTP",
"ONVIF metadata RTP payloader",
"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-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-rtp")
.field("media", "application")
.field("payload", gst::IntRange::new(96, 127))
.field("clock-rate", 90000)
.field("encoding-name", "VND.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 RTPBasePayloadImpl for OnvifMetadataPay {
fn handle_buffer(&self, buffer: gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
let pts = buffer.pts();
let dts = buffer.dts();
// Input buffer must be readable
let buffer = buffer.into_mapped_buffer_readable().map_err(|_| {
gst::element_imp_error!(
self,
gst::ResourceError::Read,
["Failed to map buffer readable"]
);
gst::FlowError::Error
})?;
// Input buffer must be valid UTF-8
let utf8 = std::str::from_utf8(buffer.as_ref()).map_err(|err| {
gst::element_imp_error!(
self,
gst::StreamError::Format,
["Failed to decode buffer as UTF-8: {}", err]
);
gst::FlowError::Error
})?;
// Input buffer must start with a tt:MetadataStream node
let process = {
let mut process = 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" {
process = true;
}
break;
}
_ => {
process = false;
break;
}
},
Err(err) => {
gst::element_imp_error!(
self,
gst::StreamError::Format,
["Invalid XML: {}", err]
);
return Err(gst::FlowError::Error);
}
}
}
process
};
if !process {
gst::element_imp_error!(
self,
gst::StreamError::Format,
["document must start with tt:MetadataStream element"]
);
return Err(gst::FlowError::Error);
}
let mtu = self.instance().mtu();
let payload_size = gst_rtp::calc_payload_len(mtu, 0, 0) as usize;
let mut chunks = utf8.as_bytes().chunks(payload_size).peekable();
let mut buflist = gst::BufferList::new_sized((utf8.len() / payload_size) + 1);
{
let buflist_mut = buflist.get_mut().unwrap();
while let Some(chunk) = chunks.next() {
let mut outbuf = gst::Buffer::new_rtp_with_sizes(chunk.len() as u32, 0, 0)
.map_err(|err| {
gst::element_imp_error!(
self,
gst::ResourceError::Write,
["Failed to allocate output buffer: {}", err]
);
gst::FlowError::Error
})?;
{
let outbuf_mut = outbuf.get_mut().unwrap();
outbuf_mut.set_pts(pts);
outbuf_mut.set_dts(dts);
let mut outrtp = gst_rtp::RTPBuffer::from_buffer_writable(outbuf_mut).unwrap();
let payload = outrtp.payload_mut().unwrap();
payload.copy_from_slice(chunk);
// Last chunk, set marker bit
if chunks.peek().is_none() {
outrtp.set_marker(true);
}
}
buflist_mut.add(outbuf);
}
}
self.instance().push_list(buflist)
}
fn set_caps(&self, _caps: &gst::Caps) -> Result<(), gst::LoggableError> {
self.instance()
.set_options("application", true, "VND.ONVIF.METADATA", 90000);
Ok(())
}
}
|
