gstreamer-rs/gstreamer/src/format_serde.rs

172 lines
6.8 KiB
Rust

// Take a look at the license at the top of the repository in the LICENSE file.
use serde::de::{Deserialize, Deserializer};
use serde::ser::{Serialize, Serializer};
use crate::format::{Buffers, Bytes, Default, Percent, Undefined};
// Manual implementation for some types that would otherwise yield representations such as:
// "Default((Some(42)))"
macro_rules! impl_ser_de(
($t:ident) => {
impl Serialize for $t {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.0.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for $t {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
skip_assert_initialized!();
u64::deserialize(deserializer).map($t)
}
}
}
);
impl_ser_de!(Buffers);
impl_ser_de!(Bytes);
impl_ser_de!(Default);
impl Serialize for Undefined {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.0.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for Undefined {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
skip_assert_initialized!();
i64::deserialize(deserializer).map(Undefined)
}
}
impl Serialize for Percent {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.0.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for Percent {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
skip_assert_initialized!();
u32::deserialize(deserializer).map(Percent)
}
}
#[cfg(test)]
mod tests {
use crate::format::{Buffers, Bytes, Default, Percent, Undefined};
use crate::ClockTime;
use crate::Format;
use crate::GenericFormattedValue;
#[test]
fn test_serialize() {
crate::init().unwrap();
let pretty_config = ron::ser::PrettyConfig::new().new_line("".to_string());
let value = GenericFormattedValue::from(Undefined(42));
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Undefined(42)".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Undefined\":42}".to_owned(), res);
let value = GenericFormattedValue::from(Default(42));
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Default(Some(42))".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Default\":42}".to_owned(), res);
let value = GenericFormattedValue::from(Option::<Default>::None);
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Default(None)".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Default\":null}".to_owned(), res);
let value = GenericFormattedValue::from(Bytes(42));
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Bytes(Some(42))".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Bytes\":42}".to_owned(), res);
let value = GenericFormattedValue::from(ClockTime::from_nseconds(42_123_456_789));
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Time(Some(42123456789))".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Time\":42123456789}".to_owned(), res);
let value = GenericFormattedValue::from(Buffers(42));
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Buffers(Some(42))".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Buffers\":42}".to_owned(), res);
let value = GenericFormattedValue::from(Percent::try_from(0.42).unwrap());
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Percent(Some(4200))".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Percent\":4200}".to_owned(), res);
let value = GenericFormattedValue::Other(Format::Percent, 42);
let res = ron::ser::to_string_pretty(&value, pretty_config.clone());
assert_eq!(Ok("Other(Percent, 42)".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Other\":[\"Percent\",42]}".to_owned(), res);
let value = GenericFormattedValue::Other(Format::__Unknown(7), 42);
let res = ron::ser::to_string_pretty(&value, pretty_config);
assert_eq!(Ok("Other(__Unknown(7), 42)".to_owned()), res);
let res = serde_json::to_string(&value).unwrap();
assert_eq!("{\"Other\":[{\"__Unknown\":7},42]}".to_owned(), res);
}
#[test]
fn test_deserialize() {
crate::init().unwrap();
let value_ron = "Default(Some(42))";
let value_de: GenericFormattedValue = ron::de::from_str(value_ron).unwrap();
assert_eq!(value_de, GenericFormattedValue::from(Default(42)));
let value_json = "{\"Default\":42}";
let value_de: GenericFormattedValue = serde_json::from_str(value_json).unwrap();
assert_eq!(value_de, GenericFormattedValue::from(Default(42)));
let value_ron = "Other(Percent, 42)";
let value_de: GenericFormattedValue = ron::de::from_str(value_ron).unwrap();
assert_eq!(value_de, GenericFormattedValue::Other(Format::Percent, 42));
let value_json = "{\"Other\":[\"Percent\",42]}";
let value_de: GenericFormattedValue = serde_json::from_str(value_json).unwrap();
assert_eq!(value_de, GenericFormattedValue::Other(Format::Percent, 42));
}
#[test]
fn test_serde_roundtrip() {
crate::init().unwrap();
macro_rules! test_roundrip(
($value:expr) => {
let value_ser = ron::ser::to_string(&$value).unwrap();
let value_de: GenericFormattedValue = ron::de::from_str(value_ser.as_str()).unwrap();
assert_eq!(value_de, $value);
}
);
test_roundrip!(GenericFormattedValue::Undefined(Undefined::from(42)));
test_roundrip!(GenericFormattedValue::from(Default(42)));
test_roundrip!(GenericFormattedValue::from(Bytes(42)));
test_roundrip!(GenericFormattedValue::from(ClockTime::from_nseconds(
42_123_456_789
)));
test_roundrip!(GenericFormattedValue::from(Buffers(42)));
test_roundrip!(GenericFormattedValue::from(
Percent::try_from(0.42).unwrap()
));
test_roundrip!(GenericFormattedValue::Other(Format::Percent, 42));
test_roundrip!(GenericFormattedValue::Other(Format::__Unknown(7), 42));
}
}