From cdf4a13f86157155bf9518a51369f0d5c03ae707 Mon Sep 17 00:00:00 2001
From: wm4 <nfxjfg@googlemail.com>
Date: Thu, 15 Oct 2015 19:07:27 +0200
Subject: [PATCH] swresample: slightly nicer debug output for auto matrix

This is the matrix that will be used for up/downmixing.
---
 libswresample/rematrix.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libswresample/rematrix.c b/libswresample/rematrix.c
index 54ebb96b04..932088ffb7 100644
--- a/libswresample/rematrix.c
+++ b/libswresample/rematrix.c
@@ -340,11 +340,16 @@ av_cold static int auto_matrix(SwrContext *s)
             }
     }
 
+    av_log(s, AV_LOG_DEBUG, "Matrix coefficients:\n");
     for(i=0; i<av_get_channel_layout_nb_channels(out_ch_layout); i++){
+        const char *c =
+            av_get_channel_name(av_channel_layout_extract_channel(out_ch_layout, i));
+        av_log(s, AV_LOG_DEBUG, "%s: ", c ? c : "?");
         for(j=0; j<av_get_channel_layout_nb_channels(in_ch_layout); j++){
-            av_log(NULL, AV_LOG_DEBUG, "%f ", s->matrix[i][j]);
+            c = av_get_channel_name(av_channel_layout_extract_channel(in_ch_layout, j));
+            av_log(s, AV_LOG_DEBUG, "%s:%f ", c ? c : "?", s->matrix[i][j]);
         }
-        av_log(NULL, AV_LOG_DEBUG, "\n");
+        av_log(s, AV_LOG_DEBUG, "\n");
     }
     return 0;
 }