From c8a38a926f4111573615c868238538d00592b30f Mon Sep 17 00:00:00 2001
From: lummax <luogpg@googlemail.com>
Date: Fri, 11 Sep 2015 14:36:15 +0200
Subject: [PATCH] codec/audio: implement `ChannelLayoutIter.best()`

Is some cases the decoder channel layout is not supported by the selected
encoder. A selection from the channel layouts supported by the encoder is
needed. For this the method `best()` is introduced.
---
 src/codec/audio.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/codec/audio.rs b/src/codec/audio.rs
index a32aef1..6128396 100644
--- a/src/codec/audio.rs
+++ b/src/codec/audio.rs
@@ -121,6 +121,16 @@ impl ChannelLayoutIter {
 	pub fn new(ptr: *const u64) -> Self {
 		ChannelLayoutIter { ptr: ptr }
 	}
+
+	pub fn best(self, max: i32) -> ChannelLayout {
+		self.fold(::channel_layout::MONO, |acc, cur|
+			if cur.channels() > cur.channels() && cur.channels() <= max {
+				cur
+			}
+			else {
+				acc
+			})
+	}
 }
 
 impl Iterator for ChannelLayoutIter {