music_pipe: added music_pipe_peek()

music_pipe_peek() is similar to music_pipe_shift(), but doesn't remove
the chunk.  This allows it to be used with a "const" music_pipe.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/pipe.h b/src/pipe.h
index f1a231542..7ed6c917d 100644
--- a/src/pipe.h
+++ b/src/pipe.h
@@ -41,6 +41,13 @@ void
 music_pipe_free(struct music_pipe *mp);
 
 /**
+ * Returns the first #music_chunk from the pipe.  Returns NULL if the
+ * pipe is empty.
+ */
+const struct music_chunk *
+music_pipe_peek(const struct music_pipe *mp);
+
+/**
  * Removes the first chunk from the head, and returns it.
  */
 struct music_chunk *