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Tags: ser/de: gather tags with the same name together

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This commit is contained in:
François Laignel 2018-07-17 22:24:41 +02:00 committed by Sebastian Dröge
parent d856fedf06
commit 23307a4795
5 changed files with 296 additions and 236 deletions
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5
gstreamer/src/structure_serde.rs
View file

@ -93,7 +93,9 @@ impl<'de> Visitor<'de> for FieldVisitor {
.ok_or(de::Error::custom("Expected a value for `Value` name"))?;
let type_name = seq.next_element::<String>()?
.ok_or(de::Error::custom("Expected a value for `Value` type"))?;
Ok(FieldDe(name, de_send_value!(type_name, seq)))
let send_value = de_send_value!(type_name, seq)?
.ok_or(de::Error::custom("Expected a value for `Value`"))?;
Ok(FieldDe(name, send_value))
}
}
@ -103,6 +105,7 @@ impl<'de> Deserialize<'de> for FieldDe {
}
}
// FIXME: use DeserializeSeed instead
// Use `NamelessStructure` to deserialize the `Field`s and
// to add them to the `Structure` at the same time.
struct NamelessStructure(Structure);

2
gstreamer/src/tags.rs
View file

@ -39,7 +39,7 @@ macro_rules! impl_tag(
}
lazy_static! {
static ref $rust_tag: &'static str =
pub static ref $rust_tag: &'static str =
unsafe { CStr::from_ptr(ffi::$gst_tag).to_str().unwrap() };
}
};

451
gstreamer/src/tags_serde.rs
View file

@ -8,107 +8,102 @@
use ffi;
use glib;
use glib::translate::{ToGlibPtr, from_glib, from_glib_none};
use glib::{ToValue, Value};
use gobject_ffi;
use glib::translate::{ToGlibPtr, from_glib};
use glib::{SendValue, ToValue};
use serde::de;
use serde::de::{Deserialize, Deserializer, SeqAccess, Visitor};
use serde::de::{Deserialize, DeserializeSeed, Deserializer, SeqAccess, Visitor};
use serde::ser;
use serde::ser::{Serialize, Serializer, SerializeSeq, SerializeTuple};
use std::ffi::CStr;
use std::ffi::CString;
use std::cell::RefCell;
use std::fmt;
use std::rc::Rc;
use DateTime;
use Sample;
use miniobject::MiniObject;
use TagMergeMode;
use tags::*;
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 = $ser.serialize_tuple(2)?;
tup.serialize_element(tag_name)?;
tup.serialize_element(&value)?;
tup.end()
($value:ident, $seq:ident, $t:ty) => (
ser_value!($value, (), $t, |_, value| {
$seq.serialize_element(&value)
})
);
);
impl<'a> Serialize for TagSer<'a> {
// serialize trait is only available for `&self`, but we need to mutate the iterator
struct TagValuesSer<'a>(Rc<RefCell<GenericTagIterator<'a>>>);
impl<'a> TagValuesSer<'a> {
fn from(tags_ser: &TagsSer<'a>) -> Self {
TagValuesSer(Rc::clone(&tags_ser.1))
}
}
impl<'a> Serialize for TagValuesSer<'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 {
let mut tag_iter = self.0.borrow_mut();
let mut seq = serializer.serialize_seq(tag_iter.size_hint().1)?;
while let Some(value) = tag_iter.next() {
match value.type_() {
glib::Type::F64 => ser_tag!(value, seq, f64),
glib::Type::String => ser_tag!(value, seq, String),
glib::Type::U32 => ser_tag!(value, seq, u32),
glib::Type::U64 => ser_tag!(value, seq, u64),
glib::Type::Other(type_id) => {
if *DATE_TIME_OTHER_TYPE_ID == type_id {
ser_tag!(value, seq, DateTime)
} else if *SAMPLE_OTHER_TYPE_ID == type_id {
ser_tag!(value, seq, 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 {}",
glib::Type::Other(type_id),
)
format!("unimplemented `Tag` serialization for type {}", type_)
)
)
}
}
type_ => {
Err(
ser::Error::custom(
format!("unimplemented Tag serialization for type {}", type_)
)
)
}
}?;
}
seq.end()
}
}
struct TagsSer<'a>(&'a str, Rc<RefCell<GenericTagIterator<'a>>>);
impl<'a> TagsSer<'a> {
fn new(name: &'a str, tag_iter: GenericTagIterator<'a>) -> Self {
TagsSer(name, Rc::new(RefCell::new(tag_iter)))
}
}
impl<'a> Serialize for TagsSer<'a> {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let mut tup = serializer.serialize_tuple(2)?;
tup.serialize_element(self.0)?;
tup.serialize_element(&TagValuesSer::from(&self))?;
tup.end()
}
}
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()) };
let tag_count = self.n_tags();
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),
)
)?
}
}
}
let tag_list_iter = self.iter_tag_list();
for (tag_name, tag_iter) in tag_list_iter {
seq.serialize_element(&TagsSer::new(tag_name, tag_iter))?;
}
seq.end()
} else if tag_count == 0 {
@ -126,54 +121,45 @@ impl Serialize for TagList {
}
}
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)
}
de_send_value!("Tag", $tag_name, $seq, $t)
);
);
impl<'de> Visitor<'de> for TagVisitor {
type Value = TagDe;
struct TagValues<'a>(&'a str, &'a mut TagListRef);
struct TagValuesVisitor<'a>(&'a str, &'a mut TagListRef);
impl<'de, 'a> Visitor<'de> for TagValuesVisitor<'a> {
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a tuple of 2 elements (name: String, value: Tag value type)")
formatter.write_str("a sequence of `Tag` values with the same 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"))?
.as_str()
).unwrap();
fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<(), A::Error> {
let tag_type: glib::Type = unsafe {
let tag_name = self.0.to_glib_none();
from_glib(ffi::gst_tag_get_type(tag_name.0))
};
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),
loop {
let tag_value = match tag_type {
glib::Type::F64 => de_tag_value!(self.0, seq, f64),
glib::Type::String => de_tag_value!(self.0, seq, String),
glib::Type::U32 => de_tag_value!(self.0, seq, u32),
glib::Type::U64 => de_tag_value!(self.0, seq, u64),
glib::Type::Other(type_id) => {
if *DATE_TIME_OTHER_TYPE_ID == type_id {
de_tag_value!(name, seq, DateTime)
de_tag_value!(self.0, seq, DateTime)
} else if *SAMPLE_OTHER_TYPE_ID == type_id {
de_tag_value!(name, seq, Sample)
de_tag_value!(self.0, seq, Sample)
} else {
return Err(
de::Error::custom(
format!(
"unimplemented deserialization for Tag {:?} with type `{}`",
name,
"unimplemented deserialization for `Tag` {} with type `{}`",
self.0,
glib::Type::Other(type_id),
),
)
@ -184,23 +170,68 @@ impl<'de> Visitor<'de> for TagVisitor {
return Err(
de::Error::custom(
format!(
"unimplemented deserialization for Tag {:?} with type `{}`",
name,
"unimplemented deserialization for `Tag` {} with type `{}`",
self.0,
type_,
),
)
);
}
};
}?;
Ok(tag_de)
match tag_value {
Some(tag_value) => {
self.1.add_generic(self.0, &tag_value, TagMergeMode::Append)
.map_err(|_| de::Error::custom(format!(
"wrong value type for `Tag` {}",
self.0,
)))?
}
None => break,
}
}
Ok(())
}
}
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)
impl<'de, 'a> DeserializeSeed<'de> for TagValues<'a> {
type Value = ();
fn deserialize<D: Deserializer<'de>>(self, deserializer: D) -> Result<(), D::Error> {
deserializer.deserialize_seq(TagValuesVisitor(self.0, self.1))
}
}
struct TagValuesTuple<'a>(&'a mut TagListRef);
struct TagValuesTupleVisitor<'a>(&'a mut TagListRef);
impl<'de, 'a> Visitor<'de> for TagValuesTupleVisitor<'a> {
type Value = ();
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str(
"a tuple (`Tag` name: `String`, seq. of `Tag` values with the same type)"
)
}
fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<(), A::Error> {
let name = seq
.next_element::<String>()
.map_err(|err| de::Error::custom(
format!("Error reading Tag name. {:?}", err)
))?
.ok_or(de::Error::custom("Expected a name for the `Tag` name"))?;
seq.next_element_seed(TagValues(name.as_str(), self.0))?
.ok_or(de::Error::custom("Expected a seq of values for the `Tag`"))
}
}
impl<'de, 'a> DeserializeSeed<'de> for TagValuesTuple<'a> {
type Value = ();
fn deserialize<D: Deserializer<'de>>(self, deserializer: D) -> Result<(), D::Error> {
deserializer.deserialize_tuple(2, TagValuesTupleVisitor(self.0))
}
}
@ -209,19 +240,15 @@ 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")
formatter.write_str("a sequence of `Tag`s")
}
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,
);
let mut tag_list = TagList::new();
{
let tag_list = tag_list.get_mut().unwrap();
while seq.next_element_seed(TagValuesTuple(tag_list))?.is_some() {
// tags are added in the dedicated deserializers
}
}
Ok(tag_list)
@ -234,7 +261,6 @@ impl<'de> Deserialize<'de> for TagList {
}
}
#[cfg(test)]
mod tests {
extern crate ron;
@ -289,52 +315,64 @@ mod tests {
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,",
" )),",
" (\"title\", [",
" \"a 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()
),
@ -350,38 +388,44 @@ mod tests {
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,
))
("title", [
"a 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();
@ -402,13 +446,12 @@ mod tests {
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}]
["title", ["a 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();

24
gstreamer/src/toc_serde.rs
View file

@ -199,7 +199,9 @@ mod tests {
"(",
" scope: Global,",
" tags: Some([",
" (\"title\", \"toc\"),",
" (\"title\", [",
" \"toc\",",
" ]),",
" ]),",
" entries: [",
" (",
@ -221,7 +223,9 @@ mod tests {
" uid: \"chapter1.1\",",
" start_stop: Some((0, 4)),",
" tags: Some([",
" (\"title\", \"chapter 1.1\"),",
" (\"title\", [",
" \"chapter 1.1\",",
" ]),",
" ]),",
" loop_: Some((None, 0)),",
" sub_entries: [",
@ -232,7 +236,9 @@ mod tests {
" uid: \"chapter1.2\",",
" start_stop: Some((4, 10)),",
" tags: Some([",
" (\"title\", \"chapter 1.2\"),",
" (\"title\", [",
" \"chapter 1.2\",",
" ]),",
" ]),",
" loop_: Some((None, 0)),",
" sub_entries: [",
@ -245,7 +251,9 @@ mod tests {
" uid: \"chapter2\",",
" start_stop: Some((10, 15)),",
" tags: Some([",
" (\"title\", \"chapter 2\"),",
" (\"title\", [",
" \"chapter 2\",",
" ]),",
" ]),",
" loop_: Some((None, 0)),",
" sub_entries: [",
@ -271,7 +279,7 @@ mod tests {
(
scope: Global,
tags: Some([
("title", "toc"),
("title", ["toc"]),
]),
entries: [
(
@ -293,7 +301,7 @@ mod tests {
uid: "chapter1.1",
start_stop: Some((0, 4)),
tags: Some([
("title", "chapter 1.1"),
("title", ["chapter 1.1"]),
]),
loop_: Some((None, 0)),
sub_entries: [
@ -304,7 +312,7 @@ mod tests {
uid: "chapter1.2",
start_stop: Some((4, 10)),
tags: Some([
("title", "chapter 1.2"),
("title", ["chapter 1.2"]),
]),
loop_: Some((None, 0)),
sub_entries: [
@ -317,7 +325,7 @@ mod tests {
uid: "chapter2",
start_stop: Some((10, 15)),
tags: Some([
("title", "chapter 2"),
("title", ["chapter 2"]),
]),
loop_: Some((None, 0)),
sub_entries: [

50
gstreamer/src/value_serde.rs
View file

@ -163,32 +163,36 @@ impl_ser_send_value_collection!(Array);
impl_ser_send_value_collection!(List);
macro_rules! de_value(
($outer_type:expr, $type_name:expr, $seq:expr, $t:ty) => (
$seq
.next_element::<$t>()?
.ok_or_else(||
de::Error::custom(format!(
"Expected a value for `{}` with type {:?}",
$outer_type,
$type_name,
))
)?
.to_value()
($seq:expr, $t:ty) => (
{
let value = $seq
.next_element::<$t>()?
.and_then(|base_value| Some(base_value.to_value()));
Ok(value)
}
);
);
macro_rules! de_send_value(
($type_name:expr, $seq:expr, $t:ty) => (
SendValue::from(
de_value!("Value", $type_name, $seq, $t)
.try_into_send_value::<$t>()
.map_err(|_|
de::Error::custom(format!(
"Failed to convert `Value` with type {:?} to `SendValue`",
$type_name,
))
)?
)
de_send_value!("Value", $type_name, $seq, $t)
);
($outer_type:expr, $type_name:expr, $seq:expr, $t:ty) => (
match de_value!($seq, $t)? {
Some(value) => {
let glib_send_value = value
.try_into_send_value::<$t>()
.map_err(|_|
de::Error::custom(format!(
"Failed to convert `{}` with type {:?} to `SendValue`",
$outer_type,
$type_name,
))
)?;
Ok(Some(SendValue::from(glib_send_value)))
}
None => Ok(None)
}
);
($type_name:expr, $seq:expr) => (
match $type_name.as_str() {
@ -233,7 +237,9 @@ impl<'de> Visitor<'de> for SendValueVisitor {
fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<Self::Value, A::Error> {
let type_name = seq.next_element::<String>()?
.ok_or(de::Error::custom("Expected a value for `Value` type"))?;
Ok(de_send_value!(type_name, seq))
let send_value = de_send_value!(type_name, seq)?
.ok_or(de::Error::custom("Expected a value for `Value`"))?;
Ok(send_value)
}
}