From ca88fc4ed3e66dc99584466e8ab16c7a4ba26645 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 24 Dec 2014 23:04:29 +0100
Subject: [PATCH] output/jack: cache AudioFormat::channels

---
 src/output/plugins/JackOutputPlugin.cxx | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/output/plugins/JackOutputPlugin.cxx b/src/output/plugins/JackOutputPlugin.cxx
index 2872e27aa..c10d76b7e 100644
--- a/src/output/plugins/JackOutputPlugin.cxx
+++ b/src/output/plugins/JackOutputPlugin.cxx
@@ -643,15 +643,14 @@ mpd_jack_delay(AudioOutput *ao)
 inline size_t
 JackOutput::WriteSamples(const float *src, size_t n_frames)
 {
+	const unsigned n_channels = audio_format.channels;
 	const size_t result = n_frames;
 
-	while (n_frames-- > 0) {
-		for (unsigned i = 0; i < audio_format.channels; ++i, ++src) {
+	while (n_frames-- > 0)
+		for (unsigned i = 0; i < n_channels; ++i, ++src)
 			jack_ringbuffer_write(ringbuffer[i],
 					      (const char *)src,
 					      sizeof(*src));
-		}
-	}
 
 	return result;
 }