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Commit 20834e47 authored by François Laignel's avatar François Laignel Committed by Sebastian Dröge
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Tags: serde impl

parent 4f948e2c
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gstreamer/src/tags.rs
View file @ 20834e47
......@@ -522,6 +522,232 @@ impl StaticType for TagListRef {
}
}
#[cfg(feature = "ser_de")]
mod serde {
use glib::translate::from_glib_none;
use glib::{ToValue, Value};
use gobject_ffi;
use serde::de;
use serde::de::{Deserialize, Deserializer, SeqAccess, Visitor};
use serde::ser;
use serde::ser::{Serialize, Serializer, SerializeSeq, SerializeTuple};
use super::*;
use std::ffi::CString;
use DateTime;
use Sample;
use value::serde::{DATE_TIME_OTHER_TYPE_ID, SAMPLE_OTHER_TYPE_ID};
struct TagSer<'a>(&'a str, Value);
macro_rules! ser_tag (
($tag_ser:ident, $ser:ident, $t:ty) => (
ser_value!($tag_ser.1, $tag_ser.0, $t, |tag_name, value| {
let mut tup = $ser.serialize_tuple(2)?;
tup.serialize_element(tag_name)?;
tup.serialize_element(&value)?;
tup.end()
})
);
);
impl<'a> Serialize for TagSer<'a> {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
match self.1.type_() {
glib::Type::F64 => ser_tag!(self, serializer, f64),
glib::Type::String => ser_tag!(self, serializer, String),
glib::Type::U32 => ser_tag!(self, serializer, u32),
glib::Type::U64 => ser_tag!(self, serializer, u64),
glib::Type::Other(type_id) => {
if *DATE_TIME_OTHER_TYPE_ID == type_id {
ser_tag!(self, serializer, DateTime)
} else if *SAMPLE_OTHER_TYPE_ID == type_id {
ser_tag!(self, serializer, Sample)
} else {
Err(
ser::Error::custom(
format!("unimplemented Tag serialization for type {}",
glib::Type::Other(type_id),
)
)
)
}
}
type_ => {
Err(
ser::Error::custom(
format!("unimplemented Tag serialization for type {}", type_)
)
)
}
}
}
}
impl Serialize for TagListRef {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let tag_count = unsafe { ffi::gst_tag_list_n_tags(self.as_ptr()) };
if tag_count > 0 {
let mut seq = serializer.serialize_seq(Some(tag_count as usize))?;
for name_index in 0..tag_count {
unsafe {
let tag_name = ffi::gst_tag_list_nth_tag_name(self.as_ptr(), name_index as u32);
let tag_size = ffi::gst_tag_list_get_tag_size(self.as_ptr(), tag_name);
for tag_index in 0..tag_size {
let value = ffi::gst_tag_list_get_value_index(
self.as_ptr(),
tag_name,
tag_index,
);
if !value.is_null() {
let tag_name = CStr::from_ptr(tag_name)
.to_str()
.map_err(|_| {
ser::Error::custom(
format!(
"invalid UTF-8 characters in Tag name {:?}",
tag_name,
)
)
})?;
seq.serialize_element(
&TagSer(
tag_name,
from_glib_none(value as *mut gobject_ffi::GValue),
)
)?
}
}
}
}
seq.end()
} else if tag_count == 0 {
let seq = serializer.serialize_seq(None)?;
seq.end()
} else {
Err(ser::Error::custom("tag count < 0"))
}
}
}
impl Serialize for TagList {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.as_ref().serialize(serializer)
}
}
struct TagDe(CString, Value);
struct TagVisitor;
macro_rules! de_tag_value(
($tag_name:expr, $seq:expr, $t:ty) => (
{
let value = de_value!("Tag", $tag_name, $seq, $t);
TagDe($tag_name, value)
}
);
);
impl<'de> Visitor<'de> for TagVisitor {
type Value = TagDe;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a tuple of 2 elements (name: String, value: Tag value type)")
}
fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<Self::Value, A::Error> {
let name = CString::new(
seq
.next_element::<String>()
.map_err(|err| de::Error::custom(
format!("Error reading Tag name. {:?}", err)
))?
.ok_or(de::Error::custom("Expected a value for Tag name, found `None`"))?
.as_str()
).unwrap();
unsafe {
let type_: glib::Type = from_glib(ffi::gst_tag_get_type(name.as_ptr() as *const i8));
let tag_de = match type_ {
glib::Type::F64 => de_tag_value!(name, seq, f64),
glib::Type::String => de_tag_value!(name, seq, String),
glib::Type::U32 => de_tag_value!(name, seq, u32),
glib::Type::U64 => de_tag_value!(name, seq, u64),
glib::Type::Other(type_id) => {
if *DATE_TIME_OTHER_TYPE_ID == type_id {
de_tag_value!(name, seq, DateTime)
} else if *SAMPLE_OTHER_TYPE_ID == type_id {
de_tag_value!(name, seq, Sample)
} else {
return Err(
de::Error::custom(
format!(
"unimplemented deserialization for Tag {:?} with type `{}`",
name,
glib::Type::Other(type_id),
),
)
);
}
}
type_ => {
return Err(
de::Error::custom(
format!(
"unimplemented deserialization for Tag {:?} with type `{}`",
name,
type_,
),
)
);
}
};
Ok(tag_de)
}
}
}
impl<'de> Deserialize<'de> for TagDe {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_tuple(2, TagVisitor{}) // 2 items in the tuple: (name, value)
}
}
struct TagListVisitor;
impl<'de> Visitor<'de> for TagListVisitor {
type Value = TagList;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a sequence of Tags")
}
fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<Self::Value, A::Error> {
let tag_list = TagList::new();
while let Some(tag_de) = seq.next_element::<TagDe>()? {
unsafe {
ffi::gst_tag_list_add_value(
tag_list.as_mut_ptr(),
ffi::GST_TAG_MERGE_APPEND,
tag_de.0.as_ptr(),
tag_de.1.to_glib_none().0,
);
}
}
Ok(tag_list)
}
}
impl<'de> Deserialize<'de> for TagList {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_seq(TagListVisitor)
}
}
}
unsafe impl Sync for TagListRef {}
unsafe impl Send for TagListRef {}
......@@ -847,4 +1073,193 @@ mod tests {
assert_eq!(first_duration.get(), Some(::SECOND * 120));
assert!(tag_iter.next().is_none());
}
#[cfg(feature = "ser_de")]
#[test]
fn test_serialize() {
extern crate ron;
use Buffer;
use GenericFormattedValue;
::init().unwrap();
let mut tags = TagList::new();
assert_eq!(tags.to_string(), "taglist;");
{
let tags = tags.get_mut().unwrap();
tags.add::<Title>(&"a title", TagMergeMode::Append); // String
tags.add::<Title>(&"another title", TagMergeMode::Append); // String
tags.add::<Duration>(&(::SECOND * 120).into(), TagMergeMode::Append); // u64
tags.add::<Bitrate>(&96_000, TagMergeMode::Append); // u32
tags.add::<TrackGain>(&1f64, TagMergeMode::Append); // f64
tags.add::<DateTime>(
&::DateTime::new(2f32, 2018, 5, 28, 16, 6, 42.841f64),
TagMergeMode::Append,
); // DateTime
let sample = {
let mut buffer = Buffer::from_slice(vec![1, 2, 3, 4]).unwrap();
{
let buffer = buffer.get_mut().unwrap();
buffer.set_offset(0);
buffer.set_offset_end(0);
}
Sample::new::<GenericFormattedValue>(
Some(&buffer),
None,
None,
None,
)
};
tags.add::<Image>(&sample, TagMergeMode::Append); // Sample
}
let mut pretty_config = ron::ser::PrettyConfig::default();
pretty_config.new_line = "".to_string();
let res = ron::ser::to_string_pretty(&tags, pretty_config);
assert_eq!(
Ok(
concat!(
"[",
" (\"title\", \"a title\"),",
" (\"title\", \"another title\"),",
" (\"duration\", 120000000000),",
" (\"bitrate\", 96000),",
" (\"replaygain-track-gain\", 1),",
" (\"datetime\", (",
" tz_offset: 2,",
" y: 2018,",
" m: 5,",
" d: 28,",
" h: 16,",
" mn: 6,",
" s: 42,",
" us: 841000,",
" )),",
" (\"image\", (",
" buffer: Some((",
" pts: None,",
" dts: None,",
" duration: None,",
" offset: 0,",
" offset_end: 0,",
" flags: (",
" bits: 0,",
" ),",
" buffer: \"AQIDBA==\",",
" )),",
" buffer_list: None,",
" caps: None,",
" segment: Some((",
" flags: (",
" bits: 0,",
" ),",
" rate: 1,",
" applied_rate: 1,",
" format: Time,",
" base: 0,",
" offset: 0,",
" start: 0,",
" stop: -1,",
" time: 0,",
" position: 0,",
" duration: -1,",
" )),",
" info: None,",
" )),",
"]",
).to_owned()
),
res,
);
}
#[cfg(feature = "ser_de")]
#[test]
fn test_deserialize() {
extern crate ron;
extern crate serde_json;
::init().unwrap();
let tag_list_ron = r#"
[
("title", "a title"),
("title", "another title"),
("duration", 120000000000),
("bitrate", 96000),
("replaygain-track-gain", 1),
("datetime", (
tz_offset: 2,
y: 2018,
m: 5,
d: 28,
h: 16,
mn: 6,
s: 42,
us: 841000,
)),
("image", (
buffer: Some((
pts: None,
dts: None,
duration: None,
offset: 0,
offset_end: 0,
flags: (
bits: 0,
),
buffer: "AQIDBA==",
)),
buffer_list: None,
caps: None,
segment: None,
info: None,
))
]
"#;
let tags: TagList = ron::de::from_str(tag_list_ron).unwrap();
assert_eq!(tags.get_index::<Title>(0).unwrap().get(), Some("a title"));
assert_eq!(tags.get_index::<Title>(1).unwrap().get(), Some("another title"));
assert_eq!(tags.get_index::<Duration>(0).unwrap().get(), Some(::SECOND * 120));
assert_eq!(tags.get_index::<Bitrate>(0).unwrap().get(), Some(96_000));
assert_eq!(tags.get_index::<TrackGain>(0).unwrap().get(), Some(1f64));
let datetime = tags.get_index::<DateTime>(0).unwrap().get().unwrap();
assert_eq!(datetime.get_year(), 2018);
assert_eq!(datetime.get_microsecond(), 841_000);
let sample = tags.get_index::<Image>(0).unwrap().get().unwrap();
let buffer = sample.get_buffer().unwrap();
{
let data = buffer.map_readable().unwrap();
assert_eq!(data.as_slice(), vec![1, 2, 3, 4].as_slice());
}
let tag_json = r#"
[
["title", "a title"],
["title", "another title"],
["duration", 120000000000],
["bitrate", 96000],
["replaygain-track-gain", 1.0],
["datetime",{"tz_offset":2.0,"y":2018,"m":5,"d":28,"h":16,"mn":6,"s":42,"us":841000}],
["image",{"buffer":{"pts":null,"dts":null,"duration":null,"offset":0,"offset_end":0,"flags":{"bits":0},"buffer":[1,2,3,4]},"buffer_list":null,"caps":null,"segment":null,"info":null}]
]
"#;
let tags: TagList = serde_json::from_str(tag_json).unwrap();
assert_eq!(tags.get_index::<Title>(0).unwrap().get(), Some("a title"));
assert_eq!(tags.get_index::<Title>(1).unwrap().get(), Some("another title"));
assert_eq!(tags.get_index::<Bitrate>(0).unwrap().get(), Some(96_000));
assert_eq!(tags.get_index::<TrackGain>(0).unwrap().get(), Some(1f64));
let datetime = tags.get_index::<DateTime>(0).unwrap().get().unwrap();
assert_eq!(datetime.get_month(), 5);
assert_eq!(datetime.get_hour(), 16);
let sample = tags.get_index::<Image>(0).unwrap().get().unwrap();
let buffer = sample.get_buffer().unwrap();
{
let data = buffer.map_readable().unwrap();
assert_eq!(data.as_slice(), vec![1, 2, 3, 4].as_slice());
}
}
}
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