start work on nihed-cros-libva

[nihav-player.git] / nihed-cros-libva / src / status.rs

diff --git a/nihed-cros-libva/src/status.rs b/nihed-cros-libva/src/status.rs
new file mode 100644 (file)
index 0000000..51781ab
--- /dev/null
+++ b/nihed-cros-libva/src/status.rs
@@ -0,0 +1,30 @@
+// Copyright 2022 The ChromiumOS Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+use std::ffi::CStr;
+
+use anyhow::anyhow;
+use anyhow::Result;
+
+use crate::bindings;
+
+/// Wrapper over `VAStatus`, calling check() returns a Error if the status is not VA_STATUS_SUCCESS.
+#[must_use = "VAStatus might not be VA_STATUS_SUCCESS."]
+pub(crate) struct Status(pub bindings::VAStatus);
+
+impl Status {
+    /// Returns `Ok(())` if this status is successful, and an error otherwise.
+    pub(crate) fn check(&self) -> Result<()> {
+        if self.0 == bindings::constants::VA_STATUS_SUCCESS as i32 {
+            Ok(())
+        } else {
+            // Safe because `vaErrorStr` will return a pointer to a statically allocated, null
+            // terminated C string. The pointer is guaranteed to never be null.
+            let err_str = unsafe { CStr::from_ptr(bindings::vaErrorStr(self.0)) }
+                .to_str()
+                .unwrap();
+            Err(anyhow!("VA-API error: {}: {}", self.0, err_str))
+        }
+    }
+}