#include "libavutil/opt.h"
#include "libavformat/avformat.h"
-int ff_alloc_input_device_context(AVFormatContext **avctx, AVInputFormat *iformat, const char *format)
+int ff_alloc_input_device_context(AVFormatContext **avctx, const AVInputFormat *iformat, const char *format)
{
AVFormatContext *s;
int ret = 0;