From 992e58248867bacc195e7a3a2a7fff04cf8f097e Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Wed, 22 Feb 2017 10:42:36 +0100
Subject: [PATCH] lavfi: temporary workaround for FFmpeg
 av_buffersrc_parameters_set() bug

The function ignores AVBufferSrcParameters.channel_layout. Set it
manually using the API.
---
 player/lavfi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/player/lavfi.c b/player/lavfi.c
index 2573a92833..5183b0e690 100644
--- a/player/lavfi.c
+++ b/player/lavfi.c
@@ -28,6 +28,7 @@
 #include <libavutil/mathematics.h>
 #include <libavutil/rational.h>
 #include <libavutil/error.h>
+#include <libavutil/opt.h>
 #include <libavfilter/avfilter.h>
 #include <libavfilter/buffersink.h>
 #include <libavfilter/buffersrc.h>
@@ -444,6 +445,14 @@ static bool init_pads(struct lavfi *c)
                 goto error;
             }
 
+            if (pad->type == STREAM_AUDIO) {
+                char layout[80];
+                snprintf(layout, sizeof(layout), "%lld",
+                         (long long)params->channel_layout);
+                av_opt_set(pad->buffer, "channel_layout", layout,
+                           AV_OPT_SEARCH_CHILDREN);
+            }
+
             int ret = av_buffersrc_parameters_set(pad->buffer, params);
             av_free(params);
             if (ret < 0)