mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2024-11-05 17:19:42 +00:00
Tags: serde impl
This commit is contained in:
François Laignel
Sebastian Dröge
parent
4f948e2cce
commit
20834e475b
1 changed files with 415 additions and 0 deletions
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@ -522,6 +522,232 @@ impl StaticType for TagListRef {
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}
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}
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#[cfg(feature = "ser_de")]
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mod serde {
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use glib::translate::from_glib_none;
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use glib::{ToValue, Value};
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use gobject_ffi;
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use serde::de;
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use serde::de::{Deserialize, Deserializer, SeqAccess, Visitor};
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use serde::ser;
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use serde::ser::{Serialize, Serializer, SerializeSeq, SerializeTuple};
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use super::*;
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use std::ffi::CString;
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use DateTime;
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use Sample;
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use value::serde::{DATE_TIME_OTHER_TYPE_ID, SAMPLE_OTHER_TYPE_ID};
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struct TagSer<'a>(&'a str, Value);
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macro_rules! ser_tag (
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($tag_ser:ident, $ser:ident, $t:ty) => (
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ser_value!($tag_ser.1, $tag_ser.0, $t, |tag_name, value| {
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let mut tup = $ser.serialize_tuple(2)?;
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tup.serialize_element(tag_name)?;
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tup.serialize_element(&value)?;
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tup.end()
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})
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);
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);
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impl<'a> Serialize for TagSer<'a> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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match self.1.type_() {
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glib::Type::F64 => ser_tag!(self, serializer, f64),
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glib::Type::String => ser_tag!(self, serializer, String),
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glib::Type::U32 => ser_tag!(self, serializer, u32),
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glib::Type::U64 => ser_tag!(self, serializer, u64),
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glib::Type::Other(type_id) => {
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if *DATE_TIME_OTHER_TYPE_ID == type_id {
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ser_tag!(self, serializer, DateTime)
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} else if *SAMPLE_OTHER_TYPE_ID == type_id {
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ser_tag!(self, serializer, Sample)
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} else {
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Err(
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ser::Error::custom(
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format!("unimplemented Tag serialization for type {}",
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glib::Type::Other(type_id),
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)
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)
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)
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}
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}
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type_ => {
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Err(
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ser::Error::custom(
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format!("unimplemented Tag serialization for type {}", type_)
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)
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)
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}
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}
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}
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}
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impl Serialize for TagListRef {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let tag_count = unsafe { ffi::gst_tag_list_n_tags(self.as_ptr()) };
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if tag_count > 0 {
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let mut seq = serializer.serialize_seq(Some(tag_count as usize))?;
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for name_index in 0..tag_count {
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unsafe {
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let tag_name = ffi::gst_tag_list_nth_tag_name(self.as_ptr(), name_index as u32);
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let tag_size = ffi::gst_tag_list_get_tag_size(self.as_ptr(), tag_name);
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for tag_index in 0..tag_size {
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let value = ffi::gst_tag_list_get_value_index(
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self.as_ptr(),
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tag_name,
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tag_index,
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);
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if !value.is_null() {
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let tag_name = CStr::from_ptr(tag_name)
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.to_str()
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.map_err(|_| {
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ser::Error::custom(
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format!(
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"invalid UTF-8 characters in Tag name {:?}",
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tag_name,
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)
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)
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})?;
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seq.serialize_element(
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&TagSer(
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tag_name,
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from_glib_none(value as *mut gobject_ffi::GValue),
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)
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)?
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}
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}
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}
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}
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seq.end()
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} else if tag_count == 0 {
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let seq = serializer.serialize_seq(None)?;
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seq.end()
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} else {
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Err(ser::Error::custom("tag count < 0"))
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}
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}
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}
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impl Serialize for TagList {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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self.as_ref().serialize(serializer)
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}
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}
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struct TagDe(CString, Value);
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struct TagVisitor;
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macro_rules! de_tag_value(
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($tag_name:expr, $seq:expr, $t:ty) => (
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{
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let value = de_value!("Tag", $tag_name, $seq, $t);
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TagDe($tag_name, value)
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}
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);
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);
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impl<'de> Visitor<'de> for TagVisitor {
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type Value = TagDe;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a tuple of 2 elements (name: String, value: Tag value type)")
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}
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fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<Self::Value, A::Error> {
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let name = CString::new(
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seq
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.next_element::<String>()
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.map_err(|err| de::Error::custom(
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format!("Error reading Tag name. {:?}", err)
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))?
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.ok_or(de::Error::custom("Expected a value for Tag name, found `None`"))?
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.as_str()
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).unwrap();
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unsafe {
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let type_: glib::Type = from_glib(ffi::gst_tag_get_type(name.as_ptr() as *const i8));
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let tag_de = match type_ {
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glib::Type::F64 => de_tag_value!(name, seq, f64),
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glib::Type::String => de_tag_value!(name, seq, String),
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glib::Type::U32 => de_tag_value!(name, seq, u32),
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glib::Type::U64 => de_tag_value!(name, seq, u64),
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glib::Type::Other(type_id) => {
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if *DATE_TIME_OTHER_TYPE_ID == type_id {
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de_tag_value!(name, seq, DateTime)
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} else if *SAMPLE_OTHER_TYPE_ID == type_id {
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de_tag_value!(name, seq, Sample)
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} else {
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return Err(
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de::Error::custom(
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format!(
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"unimplemented deserialization for Tag {:?} with type `{}`",
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name,
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glib::Type::Other(type_id),
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),
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)
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);
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}
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}
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type_ => {
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return Err(
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de::Error::custom(
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format!(
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"unimplemented deserialization for Tag {:?} with type `{}`",
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name,
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type_,
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),
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)
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);
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}
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};
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Ok(tag_de)
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}
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}
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}
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impl<'de> Deserialize<'de> for TagDe {
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fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
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deserializer.deserialize_tuple(2, TagVisitor{}) // 2 items in the tuple: (name, value)
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}
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}
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struct TagListVisitor;
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impl<'de> Visitor<'de> for TagListVisitor {
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type Value = TagList;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.write_str("a sequence of Tags")
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}
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fn visit_seq<A: SeqAccess<'de>>(self, mut seq: A) -> Result<Self::Value, A::Error> {
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let tag_list = TagList::new();
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while let Some(tag_de) = seq.next_element::<TagDe>()? {
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unsafe {
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ffi::gst_tag_list_add_value(
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tag_list.as_mut_ptr(),
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ffi::GST_TAG_MERGE_APPEND,
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tag_de.0.as_ptr(),
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tag_de.1.to_glib_none().0,
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);
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}
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}
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Ok(tag_list)
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}
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}
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impl<'de> Deserialize<'de> for TagList {
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fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
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deserializer.deserialize_seq(TagListVisitor)
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}
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}
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}
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unsafe impl Sync for TagListRef {}
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unsafe impl Send for TagListRef {}
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@ -847,4 +1073,193 @@ mod tests {
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assert_eq!(first_duration.get(), Some(::SECOND * 120));
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assert!(tag_iter.next().is_none());
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}
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#[cfg(feature = "ser_de")]
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#[test]
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fn test_serialize() {
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extern crate ron;
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use Buffer;
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use GenericFormattedValue;
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::init().unwrap();
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let mut tags = TagList::new();
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assert_eq!(tags.to_string(), "taglist;");
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{
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let tags = tags.get_mut().unwrap();
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tags.add::<Title>(&"a title", TagMergeMode::Append); // String
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tags.add::<Title>(&"another title", TagMergeMode::Append); // String
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tags.add::<Duration>(&(::SECOND * 120).into(), TagMergeMode::Append); // u64
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tags.add::<Bitrate>(&96_000, TagMergeMode::Append); // u32
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tags.add::<TrackGain>(&1f64, TagMergeMode::Append); // f64
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tags.add::<DateTime>(
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&::DateTime::new(2f32, 2018, 5, 28, 16, 6, 42.841f64),
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TagMergeMode::Append,
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); // DateTime
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let sample = {
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let mut buffer = Buffer::from_slice(vec![1, 2, 3, 4]).unwrap();
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{
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let buffer = buffer.get_mut().unwrap();
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buffer.set_offset(0);
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buffer.set_offset_end(0);
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}
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Sample::new::<GenericFormattedValue>(
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Some(&buffer),
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None,
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None,
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None,
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)
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};
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tags.add::<Image>(&sample, TagMergeMode::Append); // Sample
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}
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let mut pretty_config = ron::ser::PrettyConfig::default();
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pretty_config.new_line = "".to_string();
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let res = ron::ser::to_string_pretty(&tags, pretty_config);
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assert_eq!(
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Ok(
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concat!(
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"[",
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" (\"title\", \"a title\"),",
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" (\"title\", \"another title\"),",
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" (\"duration\", 120000000000),",
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" (\"bitrate\", 96000),",
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" (\"replaygain-track-gain\", 1),",
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" (\"datetime\", (",
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" tz_offset: 2,",
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" y: 2018,",
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" m: 5,",
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" d: 28,",
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" h: 16,",
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" mn: 6,",
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" s: 42,",
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" us: 841000,",
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" )),",
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" (\"image\", (",
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" buffer: Some((",
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" pts: None,",
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" dts: None,",
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" duration: None,",
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" offset: 0,",
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" offset_end: 0,",
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" flags: (",
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" bits: 0,",
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" ),",
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" buffer: \"AQIDBA==\",",
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" )),",
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" buffer_list: None,",
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" caps: None,",
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" segment: Some((",
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" flags: (",
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" bits: 0,",
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" ),",
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" rate: 1,",
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" applied_rate: 1,",
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" format: Time,",
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" base: 0,",
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" offset: 0,",
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" start: 0,",
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" stop: -1,",
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" time: 0,",
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" position: 0,",
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" duration: -1,",
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" )),",
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" info: None,",
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" )),",
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"]",
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).to_owned()
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),
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res,
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);
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}
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#[cfg(feature = "ser_de")]
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#[test]
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fn test_deserialize() {
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extern crate ron;
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extern crate serde_json;
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::init().unwrap();
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let tag_list_ron = r#"
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[
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("title", "a title"),
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("title", "another title"),
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("duration", 120000000000),
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("bitrate", 96000),
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("replaygain-track-gain", 1),
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("datetime", (
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tz_offset: 2,
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y: 2018,
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m: 5,
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d: 28,
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h: 16,
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mn: 6,
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s: 42,
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us: 841000,
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)),
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("image", (
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buffer: Some((
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pts: None,
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dts: None,
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duration: None,
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offset: 0,
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offset_end: 0,
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flags: (
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bits: 0,
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),
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buffer: "AQIDBA==",
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)),
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buffer_list: None,
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caps: None,
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segment: None,
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info: None,
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))
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]
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"#;
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let tags: TagList = ron::de::from_str(tag_list_ron).unwrap();
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assert_eq!(tags.get_index::<Title>(0).unwrap().get(), Some("a title"));
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assert_eq!(tags.get_index::<Title>(1).unwrap().get(), Some("another title"));
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assert_eq!(tags.get_index::<Duration>(0).unwrap().get(), Some(::SECOND * 120));
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assert_eq!(tags.get_index::<Bitrate>(0).unwrap().get(), Some(96_000));
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assert_eq!(tags.get_index::<TrackGain>(0).unwrap().get(), Some(1f64));
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let datetime = tags.get_index::<DateTime>(0).unwrap().get().unwrap();
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assert_eq!(datetime.get_year(), 2018);
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assert_eq!(datetime.get_microsecond(), 841_000);
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let sample = tags.get_index::<Image>(0).unwrap().get().unwrap();
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let buffer = sample.get_buffer().unwrap();
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{
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let data = buffer.map_readable().unwrap();
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assert_eq!(data.as_slice(), vec![1, 2, 3, 4].as_slice());
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}
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let tag_json = r#"
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[
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["title", "a title"],
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["title", "another title"],
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["duration", 120000000000],
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["bitrate", 96000],
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["replaygain-track-gain", 1.0],
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["datetime",{"tz_offset":2.0,"y":2018,"m":5,"d":28,"h":16,"mn":6,"s":42,"us":841000}],
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["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}]
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]
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"#;
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let tags: TagList = serde_json::from_str(tag_json).unwrap();
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assert_eq!(tags.get_index::<Title>(0).unwrap().get(), Some("a title"));
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assert_eq!(tags.get_index::<Title>(1).unwrap().get(), Some("another title"));
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assert_eq!(tags.get_index::<Bitrate>(0).unwrap().get(), Some(96_000));
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assert_eq!(tags.get_index::<TrackGain>(0).unwrap().get(), Some(1f64));
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let datetime = tags.get_index::<DateTime>(0).unwrap().get().unwrap();
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assert_eq!(datetime.get_month(), 5);
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assert_eq!(datetime.get_hour(), 16);
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let sample = tags.get_index::<Image>(0).unwrap().get().unwrap();
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let buffer = sample.get_buffer().unwrap();
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{
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let data = buffer.map_readable().unwrap();
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assert_eq!(data.as_slice(), vec![1, 2, 3, 4].as_slice());
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}
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}
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}
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