---
 libavresample/utils.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavresample/utils.c b/libavresample/utils.c
index 01daa23..dd299f5 100644
--- a/libavresample/utils.c
+++ b/libavresample/utils.c
@@ -37,6 +37,11 @@ int avresample_open(AVAudioResampleContext *avr)
 {
     int ret;
 
+    if (avresample_is_open(avr)) {
+        av_log(avr, AV_LOG_ERROR, "The resampling context is already open.\n");
+        return AVERROR(EINVAL);
+    }
+
     /* set channel mixing parameters */
     avr->in_channels = 
av_get_channel_layout_nb_channels(avr->in_channel_layout);
     if (avr->in_channels <= 0 || avr->in_channels > AVRESAMPLE_MAX_CHANNELS) {
-- 
1.7.10.4

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