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-rw-r--r--src/post/audio/upmix.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/post/audio/upmix.c b/src/post/audio/upmix.c
index 9cf68b365..76cf8f1b2 100644
--- a/src/post/audio/upmix.c
+++ b/src/post/audio/upmix.c
@@ -396,6 +396,8 @@ static post_plugin_t *upmix_open_plugin(post_class_t *class_gen, int inputs,
_x_post_init(&this->post, 1, 0);
+ pthread_mutex_init(&this->lock, 0);
+
this->params.cut_off_freq = 100;
port = _x_post_intercept_audio_port(&this->post, audio_target[0], &input, &output);