src: Use a macro for testing frame_type

Replace checks for INTER or SWITCH frames with a simple macro for
increased readability and maintainability.

1 files changed, 37 insertions, 0 deletions

diff --git a/include/common/frame.h b/include/common/frame.h
new file mode 100644
index 0000000..de2bd0d
--- /dev/null
+++ b/include/common/frame.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright © 2021, VideoLAN and dav1d authors
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DAV1D_COMMON_FRAME_H
+#define DAV1D_COMMON_FRAME_H
+
+/*
+ * Checks whether Dav1dFrameType == INTER || == SWITCH
+ * Both are defined as odd numbers {1, 3} and therefore have the LSB set.
+ */
+#define IS_INTER_OR_SWITCH(frame_header) \
+    ((frame_header)->frame_type & 1)
+
+#endif /* DAV1D_COMMON_FRAME_H */