swresample: Allow reinitialization without ever setting channel counts

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 4 insertions, 0 deletions

diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index c2be82c4e5..cb17e1675d 100644
--- a/libswresample/swresample.c
+++ b/libswresample/swresample.c
@@ -164,6 +164,10 @@ av_cold int swr_init(struct SwrContext *s){
         return AVERROR(EINVAL);
     }
 
+    s->out.ch_count  = s-> user_out_ch_count;
+    s-> in.ch_count  = s->  user_in_ch_count;
+    s->used_ch_count = s->user_used_ch_count;
+
     if(av_get_channel_layout_nb_channels(s-> in_ch_layout) > SWR_CH_MAX) {
         av_log(s, AV_LOG_WARNING, "Input channel layout 0x%"PRIx64" is invalid or unsupported.\n", s-> in_ch_layout);
         s->in_ch_layout = 0;