avutil/fifo: add function av_fifo_generic_peek_at()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 11 insertions, 0 deletions

diff --git a/libavutil/fifo.h b/libavutil/fifo.h
index 0e4070b99e..dc7bc6f0dd 100644
--- a/libavutil/fifo.h
+++ b/libavutil/fifo.h
@@ -84,6 +84,17 @@ int av_fifo_size(const AVFifoBuffer *f);
 int av_fifo_space(const AVFifoBuffer *f);
 
 /**
+ * Feed data at specific position from an AVFifoBuffer to a user-supplied callback.
+ * Similar as av_fifo_gereric_read but without discarding data.
+ * @param f AVFifoBuffer to read from
+ * @param offset offset from current read position
+ * @param buf_size number of bytes to read
+ * @param func generic read function
+ * @param dest data destination
+ */
+int av_fifo_generic_peek_at(AVFifoBuffer *f, void *dest, int offset, int buf_size, void (*func)(void*, void*, int));
+
+/**
  * Feed data from an AVFifoBuffer to a user-supplied callback.
  * Similar as av_fifo_gereric_read but without discarding data.
  * @param f AVFifoBuffer to read from