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-rw-r--r--libavutil/fifo.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavutil/fifo.c b/libavutil/fifo.c
index 4ff3194c5f..f2fe93de75 100644
--- a/libavutil/fifo.c
+++ b/libavutil/fifo.c
@@ -129,7 +129,8 @@ int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size,
do {
int len = FFMIN(f->end - wptr, size);
if (func) {
- if (func(src, wptr, len) <= 0)
+ len = func(src, wptr, len);
+ if (len <= 0)
break;
} else {
memcpy(wptr, src, len);