---
 libavcodec/gsmdec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/libavcodec/gsmdec.c b/libavcodec/gsmdec.c
index 7c247a6..57286c7 100644
--- a/libavcodec/gsmdec.c
+++ b/libavcodec/gsmdec.c
@@ -58,7 +58,8 @@ static int gsm_decode_frame(AVCodecContext *avctx, void *data,
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     int16_t *samples = data;
-    int frame_bytes = 2 * avctx->frame_size;
+    int frame_bytes = avctx->frame_size *
+                      av_get_bytes_per_sample(avctx->sample_fmt);
 
     if (*data_size < frame_bytes)
         return -1;
-- 
1.7.1

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