a.patch

diff --git a/src/lib.rs b/src/lib.rs
index c67ad0a..1438342 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -101,6 +101,7 @@ pub struct Packet {
     pub frame_type: FrameType,
 }

+type PixelRange=rav1e::PixelRange;
 type ChromaSamplePosition=rav1e::ChromaSamplePosition;
 type ChromaSampling=rav1e::ChromaSampling;
 type MatrixCoefficients=rav1e::MatrixCoefficients;
@@ -122,6 +123,33 @@ pub unsafe extern "C" fn rav1e_config_default() -> *mut Config {
     Box::into_raw(c)
 }

+
+/// Set pixel format of the stream.
+///
+/// Supported values for subsampling and chromapos are defined by the
+/// enum types RaChromaSampling and RaChromaSamplePosition respectively.
+/// Valid values for fullrange are 0 and 1.
+///
+/// Reuturns a negative value on error or 0.
+#[no_mangle]
+pub unsafe extern "C" fn rav1e_config_set_pixel_format(cfg: *mut Config,
+                                                       bit_depth: u8,
+                                                       subsampling: ChromaSampling,
+                                                       chroma_pos: ChromaSamplePosition,
+                                                       pixel_range: PixelRange
+) -> c_int {
+    if bit_depth != 8 && bit_depth != 10 && bit_depth != 12 {
+        return -1
+    }
+
+    (*cfg).cfg.enc.bit_depth = bit_depth as usize;
+    (*cfg).cfg.enc.chroma_sampling = subsampling;
+    (*cfg).cfg.enc.chroma_sample_position = chroma_pos;
+    (*cfg).cfg.enc.pixel_range = pixel_range;
+
+    0
+}
+
 /// Set color properties of the stream.
 ///
 /// Supported values are defined by the enum types