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use anyhow::{anyhow, bail};
use std::{fmt::Display, str::FromStr};
pub struct SessionDescription {
pub version: String,
pub originator: String,
pub session_name: String,
pub session_information: Option<String>,
pub description_uri: Option<String>,
pub email_address: Option<String>,
pub phone_number: Option<String>,
pub connection_information: Option<String>,
pub bandwidth: Vec<String>,
pub time_descriptions: Vec<TimeDescription>,
pub time_zone_adjustments: Option<String>,
pub encryption_key: Option<String>,
pub attributes: Vec<String>,
pub media_descriptions: Vec<MediaDescription>,
}
pub struct TimeDescription {
pub time: String,
pub repeat_times: Vec<String>,
}
pub struct MediaDescription {
pub name: String,
pub title: Option<String>,
pub connection_information: Option<String>,
pub bandwidth: Vec<String>,
pub encryption_key: Option<String>,
pub attributes: Vec<String>,
}
impl FromStr for SessionDescription {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut version = None;
let mut originator = None;
let mut session_name = None;
let mut session_information = None;
let mut description_uri = None;
let mut email_address = None;
let mut phone_number = None;
let mut connection_information = None;
let mut encryption_key = None;
let mut time_zone_adjustments = None;
let mut bandwidth = Vec::new();
let mut time_descriptions = Vec::new();
let mut media_descriptions = Vec::new();
let mut attributes = Vec::new();
for line in s.lines() {
let (r#type, value) = line.split_once("=").ok_or(anyhow!("sdp line invalid"))?;
match r#type {
"v" => version = Some(value.to_string()),
"o" => originator = Some(value.to_string()),
"s" => session_name = Some(value.to_string()),
"i" => session_information = Some(value.to_string()),
"u" => description_uri = Some(value.to_string()),
"e" => email_address = Some(value.to_string()),
"p" => phone_number = Some(value.to_string()),
"t" => time_descriptions.push(TimeDescription {
repeat_times: Vec::new(),
time: value.to_string(),
}),
"r" => time_descriptions
.last_mut()
.ok_or(anyhow!("no time desc"))?
.repeat_times
.push(value.to_string()),
"z" => time_zone_adjustments = Some(value.to_string()),
"m" => media_descriptions.push(MediaDescription {
connection_information: None,
name: value.to_string(),
title: None, // TODO never set, forgot it somewhere
encryption_key: None,
attributes: Vec::new(),
bandwidth: Vec::new(),
}),
"a" => {
if let Some(media_desc) = media_descriptions.last_mut() {
media_desc.attributes.push(value.to_string())
} else {
attributes.push(value.to_string())
}
}
"b" => {
if let Some(media_desc) = media_descriptions.last_mut() {
media_desc.bandwidth.push(value.to_string())
} else {
bandwidth.push(value.to_string())
}
}
"k" => {
if let Some(key) = media_descriptions.last_mut() {
key.encryption_key = Some(value.to_string())
} else {
encryption_key = Some(value.to_string())
}
}
"c" => {
if let Some(media_desc) = media_descriptions.last_mut() {
media_desc.connection_information = Some(value.to_string())
} else {
connection_information = Some(value.to_string())
}
}
x => bail!("unknown sdp type ({x:?})"),
}
}
Ok(Self {
bandwidth,
connection_information,
attributes,
description_uri,
email_address,
encryption_key,
phone_number,
session_information,
time_zone_adjustments,
media_descriptions,
originator: originator.ok_or(anyhow!("originator missing"))?,
session_name: session_name.ok_or(anyhow!("session name missing"))?,
version: version.ok_or(anyhow!("version missing"))?,
time_descriptions,
})
}
}
impl Display for SessionDescription {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let Self {
attributes,
bandwidth,
connection_information,
description_uri,
email_address,
encryption_key,
media_descriptions,
originator,
phone_number,
session_information,
session_name,
time_descriptions,
time_zone_adjustments,
version,
} = self;
writeln!(f, "v={version}")?;
writeln!(f, "o={originator}")?;
writeln!(f, "s={session_name}")?;
// TODO check order
if let Some(session_information) = session_information {
writeln!(f, "i={session_information}")?;
}
if let Some(description_uri) = description_uri {
writeln!(f, "u={description_uri}")?;
}
if let Some(email_address) = email_address {
writeln!(f, "e={email_address}")?;
}
if let Some(phone_number) = phone_number {
writeln!(f, "p={phone_number}")?;
}
for TimeDescription { time, repeat_times } in time_descriptions {
writeln!(f, "t={time}")?;
for repeat_time in repeat_times {
writeln!(f, "r={repeat_time}")?;
}
}
if let Some(encryption_key) = encryption_key {
writeln!(f, "k={encryption_key}")?;
}
if let Some(time_zone_adjustments) = time_zone_adjustments {
writeln!(f, "z={time_zone_adjustments}")?;
}
if let Some(connection_information) = connection_information {
writeln!(f, "c={connection_information}")?;
}
for bandwidth in bandwidth {
writeln!(f, "b={bandwidth}")?;
}
for attribute in attributes {
writeln!(f, "a={attribute}")?;
}
for MediaDescription {
name,
title,
connection_information,
bandwidth,
encryption_key,
attributes,
} in media_descriptions
{
writeln!(f, "m={name}")?;
if let Some(title) = title {
writeln!(f, "t={title}")?; // TODO was offline, check param name
}
if let Some(connection_information) = connection_information {
writeln!(f, "c={connection_information}")?;
}
for bandwidth in bandwidth {
writeln!(f, "b={bandwidth}")?;
}
if let Some(encryption_key) = encryption_key {
writeln!(f, "k={encryption_key}")?;
}
for attribute in attributes {
writeln!(f, "a={attribute}")?;
}
}
Ok(())
}
}
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