Implement Int/Fraction ranges and Array/Lists for GstValue

gstreamer/src/value.rs

@@ -9,12 +9,15 @@
 use num_rational::Rational32;
 use std::fmt;
 use std::ops;
+use std::borrow::{Cow, Borrow};
+use std::slice;
 
 use glib;
-use glib::value::{Value, FromValue, FromValueOptional, SetValue};
+use glib::value::{Value, FromValue, FromValueOptional, SetValue, ToValue};
 use glib::translate::{from_glib, ToGlibPtr, ToGlibPtrMut};
 
 use ffi;
+use glib_ffi;
 
 #[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq, Hash)]
 pub struct Fraction(pub Rational32);
@@ -204,5 +207,325 @@ impl SetValue for Fraction {
     }
 }
 
-// TODO: Array, List, Ranges
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
-// GStreamer value operations
+pub struct IntRange<T> {
+    min: T,
+    max: T,
+    step: T,
+}
+
+impl<T: Copy> IntRange<T> {
+    pub fn min(&self) -> T {
+        self.min
+    }
+
+    pub fn max(&self) -> T {
+        self.max
+    }
+
+    pub fn step(&self) -> T {
+        self.step
+    }
+}
+
+impl IntRange<i32> {
+    pub fn new(min: i32, max: i32) -> Self {
+        Self::new_with_step(min, max, 1)
+    }
+
+    pub fn new_with_step(min: i32, max: i32, step: i32) -> Self {
+        assert!(min <= max);
+        assert!(step > 0);
+
+        Self {
+            min: min,
+            max: max,
+            step: step,
+        }
+    }
+}
+
+impl IntRange<i64> {
+    pub fn new(min: i64, max: i64) -> Self {
+        Self::new_with_step(min, max, 1)
+    }
+
+    pub fn new_with_step(min: i64, max: i64, step: i64) -> Self {
+        assert!(min <= max);
+        assert!(step > 0);
+
+        Self {
+            min: min,
+            max: max,
+            step: step,
+        }
+    }
+}
+
+impl From<(i32, i32)> for IntRange<i32> {
+    fn from((min, max): (i32, i32)) -> Self {
+        Self::new(min, max)
+    }
+}
+
+impl From<(i32, i32, i32)> for IntRange<i32> {
+    fn from((min, max, step): (i32, i32, i32)) -> Self {
+        Self::new_with_step(min, max, step)
+    }
+}
+
+impl From<(i64, i64)> for IntRange<i64> {
+    fn from((min, max): (i64, i64)) -> Self {
+        Self::new(min, max)
+    }
+}
+
+impl From<(i64, i64, i64)> for IntRange<i64> {
+    fn from((min, max, step): (i64, i64, i64)) -> Self {
+        Self::new_with_step(min, max, step)
+    }
+}
+
+impl glib::types::StaticType for IntRange<i32> {
+    fn static_type() -> glib::types::Type {
+        unsafe { from_glib(ffi::gst_int_range_get_type()) }
+    }
+}
+
+impl<'a> FromValue<'a> for IntRange<i32> {
+    unsafe fn from_value(v: &'a Value) -> Self {
+        let min = ffi::gst_value_get_int_range_min(v.to_glib_none().0);
+        let max = ffi::gst_value_get_int_range_max(v.to_glib_none().0);
+        let step = ffi::gst_value_get_int_range_step(v.to_glib_none().0);
+
+        Self::new_with_step(min, max, step)
+    }
+}
+
+impl<'a> FromValueOptional<'a> for IntRange<i32> {
+    unsafe fn from_value_optional(v: &'a Value) -> Option<Self> {
+        Some(Self::from_value(v))
+    }
+}
+
+impl SetValue for IntRange<i32> {
+    unsafe fn set_value(v: &mut Value, r: &Self) {
+        ffi::gst_value_set_int_range_step(v.to_glib_none_mut().0, r.min(), r.max(), r.step());
+    }
+}
+
+impl glib::types::StaticType for IntRange<i64> {
+    fn static_type() -> glib::types::Type {
+        unsafe { from_glib(ffi::gst_int64_range_get_type()) }
+    }
+}
+
+impl<'a> FromValue<'a> for IntRange<i64> {
+    unsafe fn from_value(v: &'a Value) -> Self {
+        let min = ffi::gst_value_get_int64_range_min(v.to_glib_none().0);
+        let max = ffi::gst_value_get_int64_range_max(v.to_glib_none().0);
+        let step = ffi::gst_value_get_int64_range_step(v.to_glib_none().0);
+
+        Self::new_with_step(min, max, step)
+    }
+}
+
+impl<'a> FromValueOptional<'a> for IntRange<i64> {
+    unsafe fn from_value_optional(v: &'a Value) -> Option<Self> {
+        Some(Self::from_value(v))
+    }
+}
+
+impl SetValue for IntRange<i64> {
+    unsafe fn set_value(v: &mut Value, r: &Self) {
+        ffi::gst_value_set_int64_range_step(v.to_glib_none_mut().0, r.min(), r.max(), r.step());
+    }
+}
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub struct FractionRange {
+    min: Fraction,
+    max: Fraction,
+}
+
+impl FractionRange {
+    pub fn new<T: Into<Fraction>, U: Into<Fraction>>(min: T, max: U) -> Self {
+        let min = min.into();
+        let max = max.into();
+
+        assert!(min <= max);
+
+        FractionRange {
+            min: min,
+            max: max,
+        }
+    }
+
+    pub fn min(&self) -> Fraction {
+        self.min
+    }
+
+    pub fn max(&self) -> Fraction {
+        self.max
+    }
+}
+
+impl From<(Fraction, Fraction)> for FractionRange {
+    fn from((min, max): (Fraction, Fraction)) -> Self {
+        Self::new(min, max)
+    }
+}
+
+impl glib::types::StaticType for FractionRange {
+    fn static_type() -> glib::types::Type {
+        unsafe { from_glib(ffi::gst_fraction_range_get_type()) }
+    }
+}
+
+impl<'a> FromValue<'a> for FractionRange {
+    unsafe fn from_value(v: &'a Value) -> Self {
+        let min = ffi::gst_value_get_fraction_range_min(v.to_glib_none().0);
+        let max = ffi::gst_value_get_fraction_range_max(v.to_glib_none().0);
+
+        let min_n = ffi::gst_value_get_fraction_numerator(min);
+        let min_d = ffi::gst_value_get_fraction_denominator(min);
+        let max_n = ffi::gst_value_get_fraction_numerator(max);
+        let max_d = ffi::gst_value_get_fraction_denominator(max);
+
+        Self::new((min_n, min_d), (max_n, max_d))
+    }
+}
+
+impl<'a> FromValueOptional<'a> for FractionRange {
+    unsafe fn from_value_optional(v: &'a Value) -> Option<Self> {
+        Some(Self::from_value(v))
+    }
+}
+
+impl SetValue for FractionRange {
+    unsafe fn set_value(v: &mut Value, r: &Self) {
+        ffi::gst_value_set_fraction_range_full(v.to_glib_none_mut().0, *r.min().numer(), *r.min().denom(), *r.max().numer(), *r.max().denom());
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Array<'a>(Cow<'a, [glib::Value]>);
+
+impl<'a> Array<'a> {
+    pub fn new(values: &[&ToValue]) -> Self {
+        Array(values.iter().map(|v| v.to_value()).collect())
+    }
+
+    pub fn into_owned(self) -> Array<'static> {
+        Array(self.0.into_owned().into())
+    }
+
+    pub fn as_slice(&self) -> &[glib::Value] {
+        self.0.borrow()
+    }
+}
+
+impl<'a> From<&'a [&'a ToValue]> for Array<'a> {
+    fn from(values: &'a [&'a ToValue]) -> Self {
+        Self::new(values)
+    }
+}
+
+impl<'a> From<&'a [glib::Value]> for Array<'a> {
+    fn from(values: &'a [glib::Value]) -> Self {
+        Array(Cow::Borrowed(values))
+    }
+}
+
+impl<'a> FromValue<'a> for Array<'a> {
+    unsafe fn from_value(v: &'a Value) -> Self {
+        let arr = (*v.to_glib_none().0).data[0] as *const glib_ffi::GArray;
+        if arr.is_null() {
+            Array(Cow::Borrowed(&[]))
+        } else {
+            Array(Cow::Borrowed(slice::from_raw_parts((*arr).data as *const glib::Value, (*arr).len as usize)))
+        }
+    }
+}
+
+impl<'a> FromValueOptional<'a> for Array<'a> {
+    unsafe fn from_value_optional(v: &'a Value) -> Option<Self> {
+        Some(Array::from_value(v))
+    }
+}
+
+impl<'a> SetValue for Array<'a> {
+    unsafe fn set_value(v: &mut Value, a: &Self) {
+        for value in a.as_slice() {
+            ffi::gst_value_array_append_and_take_value(v.to_glib_none_mut().0, value.to_glib_full() as *mut _);
+        }
+    }
+}
+
+impl<'a> glib::types::StaticType for Array<'a> {
+    fn static_type() -> glib::types::Type {
+        unsafe { from_glib(ffi::gst_value_array_get_type()) }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct List<'a>(Cow<'a, [glib::Value]>);
+
+impl<'a> List<'a> {
+    pub fn new(values: &[&ToValue]) -> Self {
+        List(values.iter().map(|v| v.to_value()).collect())
+    }
+
+    pub fn into_owned(self) -> List<'static> {
+        List(self.0.into_owned().into())
+    }
+
+    pub fn as_slice(&self) -> &[glib::Value] {
+        self.0.borrow()
+    }
+}
+
+impl<'a> From<&'a [&'a ToValue]> for List<'a> {
+    fn from(values: &'a [&'a ToValue]) -> Self {
+        Self::new(values)
+    }
+}
+
+impl<'a> From<&'a [glib::Value]> for List<'a> {
+    fn from(values: &'a [glib::Value]) -> Self {
+        List(Cow::Borrowed(values))
+    }
+}
+
+impl<'a> FromValue<'a> for List<'a> {
+    unsafe fn from_value(v: &'a Value) -> Self {
+        let arr = (*v.to_glib_none().0).data[0] as *const glib_ffi::GArray;
+        if arr.is_null() {
+            List(Cow::Borrowed(&[]))
+        } else {
+            List(Cow::Borrowed(slice::from_raw_parts((*arr).data as *const glib::Value, (*arr).len as usize)))
+        }
+    }
+}
+
+impl<'a> FromValueOptional<'a> for List<'a> {
+    unsafe fn from_value_optional(v: &'a Value) -> Option<Self> {
+        Some(List::from_value(v))
+    }
+}
+
+impl<'a> SetValue for List<'a> {
+    unsafe fn set_value(v: &mut Value, a: &Self) {
+        for value in a.as_slice() {
+            ffi::gst_value_list_append_and_take_value(v.to_glib_none_mut().0, value.to_glib_full() as *mut _);
+        }
+    }
+}
+
+impl<'a> glib::types::StaticType for List<'a> {
+    fn static_type() -> glib::types::Type {
+        unsafe { from_glib(ffi::gst_value_list_get_type()) }
+    }
+}
+
+// TODO: GStreamer value operations