gstreamer-audio: Add support for GstAudioClippingMeta

gstreamer-audio/src/audio_meta.rs

@@ -0,0 +1,96 @@
+// Copyright (C) 2018-2020 Sebastian Dröge <sebastian@centricular.com>
+// Copyright (C) 2020 Andrew Eikum <aeikum@codeweavers.com> for CodeWeavers
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::fmt;
+
+use glib;
+use glib::translate::{from_glib, ToGlib};
+use gst;
+use gst::prelude::*;
+use gst_audio_sys;
+
+#[repr(C)]
+pub struct AudioClippingMeta(gst_audio_sys::GstAudioClippingMeta);
+
+unsafe impl Send for AudioClippingMeta {}
+unsafe impl Sync for AudioClippingMeta {}
+
+impl AudioClippingMeta {
+    pub fn add<V: Into<gst::GenericFormattedValue>>(
+        buffer: &mut gst::BufferRef,
+        start: V,
+        end: V,
+    ) -> gst::MetaRefMut<Self, gst::meta::Standalone> {
+        let start = start.into();
+        let end = end.into();
+        assert_eq!(start.get_format(), end.get_format());
+        unsafe {
+            let meta = gst_audio_sys::gst_buffer_add_audio_clipping_meta(
+                buffer.as_mut_ptr(),
+                start.get_format().to_glib(),
+                start.get_value() as u64,
+                end.get_value() as u64,
+            );
+
+            Self::from_mut_ptr(buffer, meta)
+        }
+    }
+
+    pub fn get_start(&self) -> gst::GenericFormattedValue {
+        gst::GenericFormattedValue::new(from_glib(self.0.format), self.0.start as i64)
+    }
+
+    pub fn get_end(&self) -> gst::GenericFormattedValue {
+        gst::GenericFormattedValue::new(from_glib(self.0.format), self.0.end as i64)
+    }
+}
+
+unsafe impl MetaAPI for AudioClippingMeta {
+    type GstType = gst_audio_sys::GstAudioClippingMeta;
+
+    fn get_meta_api() -> glib::Type {
+        unsafe { from_glib(gst_audio_sys::gst_audio_clipping_meta_api_get_type()) }
+    }
+}
+
+impl fmt::Debug for AudioClippingMeta {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("AudioClippingMeta")
+            .field("start", &self.get_start())
+            .field("end", &self.get_end())
+            .finish()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_add_get_meta() {
+        gst::init().unwrap();
+
+        let mut buffer = gst::Buffer::with_size(1024).unwrap();
+
+        {
+            let cmeta =
+                AudioClippingMeta::add(buffer.get_mut().unwrap(), gst::Format::Default, 1, 2);
+            assert_eq!(cmeta.get_format(), gst::Format::Default);
+            assert_eq!(cmeta.get_start(), 1);
+            assert_eq!(cmeta.get_end(), 2);
+        }
+
+        {
+            let cmeta = buffer.get_meta::<AudioClippingMeta>().unwrap();
+            assert_eq!(cmeta.get_format(), gst::Format::Default);
+            assert_eq!(cmeta.get_start(), 1);
+            assert_eq!(cmeta.get_end(), 2);
+        }
+    }
+}

gstreamer-audio/src/lib.rs

@@ -47,6 +47,8 @@ mod audio_ring_buffer_spec;
 pub use audio_ring_buffer_spec::*;
 mod audio_info;
 pub use audio_info::*;
+mod audio_meta;
+pub use audio_meta::*;
 mod audio_channel_position;
 pub use audio_channel_position::*;
 #[cfg(any(feature = "v1_14", feature = "dox"))]