refactoring

src/libs/common/frame.h

@@ -74,3 +74,7 @@ bool frame_compare(const frame_s *a, const frame_s *b);
 unsigned frame_get_padding(const frame_s *frame);
 
 const char *fourcc_to_string(unsigned format, char *buf, size_t size);
+
+inline bool is_jpeg(unsigned format) {
+	return (format == V4L2_PIX_FMT_JPEG || format == V4L2_PIX_FMT_MJPEG);
+}

src/libs/common/unjpeg.c

@@ -34,6 +34,8 @@ static void _jpeg_error_handler(j_common_ptr jpeg);
 
 
 int unjpeg(const frame_s *src, frame_s *dest, bool decode) {
+	assert(is_jpeg(src->format));
+
 	volatile int retval = 0;
 
 	struct jpeg_decompress_struct jpeg;