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segment: serde FormattedSegments too

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... and use the same `struct` for serialization and deserialization so
that fields mapping consistency is ensured at compilation time.
This commit is contained in:
François Laignel 2018-07-28 16:54:39 +02:00 committed by Sebastian Dröge
parent ab9cd29bd6
commit dfc961679f
1 changed files with 121 additions and 60 deletions
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181
gstreamer/src/segment_serde.rs
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@ -6,34 +6,20 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use serde::de;
use serde::de::{Deserialize, Deserializer};
use serde::ser::{Serialize, SerializeStruct, Serializer};
use serde::ser::{Serialize, Serializer};
use Format;
use FormattedSegment;
use FormattedValue;
use GenericFormattedValue;
use Segment;
use SegmentFlags;
use SpecificFormattedValue;
impl<'a> Serialize for Segment {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let mut datetime = serializer.serialize_struct("Segment", 11)?;
datetime.serialize_field("flags", &self.get_flags())?;
datetime.serialize_field("rate", &self.get_rate())?;
datetime.serialize_field("applied_rate", &self.get_applied_rate())?;
datetime.serialize_field("format", &self.get_format())?;
datetime.serialize_field("base", &self.get_base().get_value())?;
datetime.serialize_field("offset", &self.get_offset().get_value())?;
datetime.serialize_field("start", &self.get_start().get_value())?;
datetime.serialize_field("stop", &self.get_stop().get_value())?;
datetime.serialize_field("time", &self.get_time().get_value())?;
datetime.serialize_field("position", &self.get_position().get_value())?;
datetime.serialize_field("duration", &self.get_duration().get_value())?;
datetime.end()
}
}
#[derive(Deserialize)]
struct SegmentDe {
#[derive(Serialize, Deserialize)]
struct FormattedSegmentSerde {
flags: SegmentFlags,
rate: f64,
applied_rate: f64,
@ -47,49 +33,82 @@ struct SegmentDe {
duration: i64,
}
impl From<SegmentDe> for Segment {
fn from(segment_de: SegmentDe) -> Self {
let mut segment = Segment::new();
segment.set_flags(segment_de.flags);
segment.set_rate(segment_de.rate);
segment.set_applied_rate(segment_de.applied_rate);
segment.set_format(segment_de.format);
segment.set_base(GenericFormattedValue::new(
segment_de.format,
segment_de.base,
));
segment.set_offset(GenericFormattedValue::new(
segment_de.format,
segment_de.offset,
));
segment.set_start(GenericFormattedValue::new(
segment_de.format,
segment_de.start,
));
segment.set_stop(GenericFormattedValue::new(
segment_de.format,
segment_de.stop,
));
segment.set_time(GenericFormattedValue::new(
segment_de.format,
segment_de.time,
));
segment.set_position(GenericFormattedValue::new(
segment_de.format,
segment_de.position,
));
segment.set_duration(GenericFormattedValue::new(
segment_de.format,
segment_de.duration,
));
segment
impl<T: FormattedValue> Serialize for FormattedSegment<T> {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let fmt_seg = unsafe {
FormattedSegmentSerde {
flags: self.get_flags(),
rate: self.get_rate(),
applied_rate: self.get_applied_rate(),
format: self.get_format(),
base: self.get_base().to_raw_value(),
offset: self.get_offset().to_raw_value(),
start: self.get_start().to_raw_value(),
stop: self.get_stop().to_raw_value(),
time: self.get_time().to_raw_value(),
position: self.get_position().to_raw_value(),
duration: self.get_duration().to_raw_value(),
}
};
fmt_seg.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for Segment {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
SegmentDe::deserialize(deserializer).and_then(|segment_de| Ok(segment_de.into()))
FormattedSegmentSerde::deserialize(deserializer).map(|fmt_seg_de| {
let mut segment = Self::new();
segment.set_flags(fmt_seg_de.flags);
segment.set_rate(fmt_seg_de.rate);
segment.set_applied_rate(fmt_seg_de.applied_rate);
segment.set_format(fmt_seg_de.format);
segment.set_base(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.base,
));
segment.set_offset(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.offset,
));
segment.set_start(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.start,
));
segment.set_stop(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.stop,
));
segment.set_time(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.time,
));
segment.set_position(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.position,
));
segment.set_duration(GenericFormattedValue::new(
fmt_seg_de.format,
fmt_seg_de.duration,
));
segment
})
}
}
impl<'de, T: FormattedValue + SpecificFormattedValue> Deserialize<'de> for FormattedSegment<T> {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
Segment::deserialize(deserializer)
.and_then(|segment| {
segment.downcast::<T>()
.map_err(|segment| {
de::Error::custom(format!(
"failed to convert segment with format {:?} to {:?}",
segment.get_format(),
T::get_default_format(),
))
})
})
}
}
@ -147,7 +166,7 @@ mod tests {
}
#[test]
fn test_deserialize() {
fn test_deserialize_segment() {
::init().unwrap();
let segment_ron = r#"
@ -205,4 +224,46 @@ mod tests {
GenericFormattedValue::Time(ClockTime::none())
);
}
#[test]
fn test_deserialize_formatted() {
use format::Time;
use FormattedSegment;
::init().unwrap();
let segment_ron = r#"
(
flags: (
bits: 9,
),
rate: 1,
applied_rate: 0.9,
format: Time,
base: 123,
offset: 42,
start: 1024,
stop: 2048,
time: 1042,
position: 256,
duration: -1,
)
"#;
let fmt_seg: FormattedSegment<Time> = ron::de::from_str(segment_ron).unwrap();
assert_eq!(
fmt_seg.get_flags(),
SegmentFlags::RESET | SegmentFlags::SEGMENT
);
assert_eq!(fmt_seg.get_rate(), 1f64);
assert_eq!(fmt_seg.get_applied_rate(), 0.9f64);
assert_eq!(fmt_seg.get_format(), Format::Time);
assert_eq!(fmt_seg.get_base(), ClockTime::from_nseconds(123));
assert_eq!(fmt_seg.get_offset(), ClockTime::from_nseconds(42));
assert_eq!(fmt_seg.get_start(), ClockTime::from_nseconds(1024));
assert_eq!(fmt_seg.get_stop(), ClockTime::from_nseconds(2048));
assert_eq!(fmt_seg.get_time(), ClockTime::from_nseconds(1042));
assert_eq!(fmt_seg.get_position(), ClockTime::from_nseconds(256));
assert_eq!(fmt_seg.get_duration(), ClockTime::none());
}
}