softare: add global helpers to create contexts

src/software/mod.rs

@@ -1,5 +1,31 @@
 #[cfg(feature = "software-scaling")]
 pub mod scaling;
 
+#[cfg(feature = "software-scaling")]
+#[inline]
+pub fn scaler(format: ::format::Pixel, flags: scaling::Flags,
+              (in_width, in_height): (u32, u32),
+              (out_width, out_height): (u32, u32))
+-> Result<scaling::Context, ::Error> {
+	scaling::Context::get(format, in_width, in_height, format, out_width, out_height, flags)
+}
+
+#[cfg(feature = "software-scaling")]
+#[inline]
+pub fn converter((width, height): (u32, u32),
+                 input: ::format::Pixel,
+                 output: ::format::Pixel)
+-> Result<scaling::Context, ::Error> {
+	scaling::Context::get(input, width, height, output, width, height, scaling::flag::FAST_BILINEAR)
+}
+
 #[cfg(feature = "software-resampling")]
 pub mod resampling;
+
+#[cfg(feature = "softare-resampling")]
+#[inline]
+pub fn resampler((in_format, in_layout, in_rate): (::format::Sample, ::ChannelLayout, u32),
+                 (out_format, out_layout, out_rate): (::format::Sample, ::ChannelLayout, u32))
+-> Result<resampling::Context, ::Error> {
+	resampling::Context::get(in_format, in_layout, in_rate, out_format, out_layout, out_rate)
+}